Top on Mine Heat Damage Prevention and Cooling New Technology（2023-03）
Abstract：
In order to alleviate the problem of mine thermal damage, this paper proposes to put cold water pipe into the surrounding rock of roadway, and reduce the temperature of surrounding rock by intercepting the high temperature through the cold water pipe. According to the similarity principle, a cold water interception and cooling experimental system for high temperature surrounding rock was built. Experiments were conducted by changing cold water velocity, inlet time and surrounding rock temperature, etc. Combined with COMSOL simulation, the influence of different diameters and spacing layouts of cold water pipe on cold water interception and cooling effect of roadway surrounding rock was analyzed. The results show that when other conditions remain unchanged, the cooling range of surrounding rock increases with the increase of cold water velocity, inlet time and temperature difference between surrounding rock and cold water. When the diameter of the cold water pipe is 10 cm and the vertical distance is 2.5 m, the average temperature of the roadway wall after cooling is 23.4 ℃.
In order to alleviate the problem of mine thermal damage, this paper proposes to put cold water pipe into the surrounding rock of roadway, and reduce the temperature of surrounding rock by intercepting the high temperature through the cold water pipe. According to the similarity principle, a cold water interception and cooling experimental system for high temperature surrounding rock was built. Experiments were conducted by changing cold water velocity, inlet time and surrounding rock temperature, etc. Combined with COMSOL simulation, the influence of different diameters and spacing layouts of cold water pipe on cold water interception and cooling effect of roadway surrounding rock was analyzed. The results show that when other conditions remain unchanged, the cooling range of surrounding rock increases with the increase of cold water velocity, inlet time and temperature difference between surrounding rock and cold water. When the diameter of the cold water pipe is 10 cm and the vertical distance is 2.5 m, the average temperature of the roadway wall after cooling is 23.4 ℃.
Abstract：
In this paper, the deep hole and shallow hole temperature measurement technology is used to measure the rock temperature in No.13 mining area of Yangchangwan Coal Mine, and the cooling circle range of 937 m elevation roadway for the return air downhill in No.13 mining area and 430 m elevation roadway for the auxiliary transportation downhill in No.13 mining area are determined. The COMSOL software is used to analyze the surrounding rock temperature distribution, and the reliability of the surface borehole temperature measurement data is verified according to the temperature measurement results. Combined with the ground borehole temperature measurement data and the deep hole and shallow hole temperature measurement results, the ground temperature gradient and the heat damage area are defined, which provides a basis for the subsequent heat damage treatment.
In this paper, the deep hole and shallow hole temperature measurement technology is used to measure the rock temperature in No.13 mining area of Yangchangwan Coal Mine, and the cooling circle range of 937 m elevation roadway for the return air downhill in No.13 mining area and 430 m elevation roadway for the auxiliary transportation downhill in No.13 mining area are determined. The COMSOL software is used to analyze the surrounding rock temperature distribution, and the reliability of the surface borehole temperature measurement data is verified according to the temperature measurement results. Combined with the ground borehole temperature measurement data and the deep hole and shallow hole temperature measurement results, the ground temperature gradient and the heat damage area are defined, which provides a basis for the subsequent heat damage treatment.
2023, 54(3): 17-25.
Abstract：
In order to explore the influence of thermodynamic theory on the cooling characteristics of vortex tube control used to create artificial environment in mine, based on the first and second laws of thermodynamics are adopted to analyze the thermodynamic characteristics of fluid in vortex tube, the energy separation mechanism are explored, and the refrigeration characteristics are obtained. Using the three-dimensional fluid domain coupling method, the continuous-discontinuous model is established. Through the calculation of different mathematical models and different calculation methods, it is compared with the experimental results of Aljuwayhel. With the difference of refrigeration effect as the judgment index, the separation of pressure and velocity coupling variables is determined using the SIMPLEC algorithm. The anisotropic Reynolds stress RSM turbulence model is the most accurate, and the deviation of refrigeration effect is calculated within 12%. The analysis of the flow field in the vortex tube shows that the distribution of fluid velocity, fluid pressure and temperature flow field in the tube is basically consistent with the theory based on thermodynamic design. The simulation conclusion that the static temperature change caused by fluid temperature separation in the tube is caused by fluid heat and work conversion verifies the energy transfer process in the vortextube.
In order to explore the influence of thermodynamic theory on the cooling characteristics of vortex tube control used to create artificial environment in mine, based on the first and second laws of thermodynamics are adopted to analyze the thermodynamic characteristics of fluid in vortex tube, the energy separation mechanism are explored, and the refrigeration characteristics are obtained. Using the three-dimensional fluid domain coupling method, the continuous-discontinuous model is established. Through the calculation of different mathematical models and different calculation methods, it is compared with the experimental results of Aljuwayhel. With the difference of refrigeration effect as the judgment index, the separation of pressure and velocity coupling variables is determined using the SIMPLEC algorithm. The anisotropic Reynolds stress RSM turbulence model is the most accurate, and the deviation of refrigeration effect is calculated within 12%. The analysis of the flow field in the vortex tube shows that the distribution of fluid velocity, fluid pressure and temperature flow field in the tube is basically consistent with the theory based on thermodynamic design. The simulation conclusion that the static temperature change caused by fluid temperature separation in the tube is caused by fluid heat and work conversion verifies the energy transfer process in the vortextube.
Abstract：
A method of heat storage and temperature control for refuge chamber with phase change energy storage wall is put forward, that is, coupled temperature control method of mine air pressure, phase change cold storage for energy storage wall under conventional condition, and wall phase change heat absorption when mine accident occurs, the diatomaceous earth-based phase change material was used as the energy storage aggregate additive to prepare composite cement mortar, which was then laid on the wall of the refuge chamber to achieve temperature control effect. The test results show that when the amount of energy storage aggregate is 15% and the amount of activated carbon is 6%, the prepared composite cement mortar can be adapted to the energy storage wall structure of the refuge chamber and improve the indoor thermal environment of the refuge chamber.
A method of heat storage and temperature control for refuge chamber with phase change energy storage wall is put forward, that is, coupled temperature control method of mine air pressure, phase change cold storage for energy storage wall under conventional condition, and wall phase change heat absorption when mine accident occurs, the diatomaceous earth-based phase change material was used as the energy storage aggregate additive to prepare composite cement mortar, which was then laid on the wall of the refuge chamber to achieve temperature control effect. The test results show that when the amount of energy storage aggregate is 15% and the amount of activated carbon is 6%, the prepared composite cement mortar can be adapted to the energy storage wall structure of the refuge chamber and improve the indoor thermal environment of the refuge chamber.
2023, 54(3): 33-39.
Abstract：
In order to explore the research trends of thermodynamic disaster in coal mine, based on the perspective of information visualization, 2 845 related papers published in CNKI database from 2002 to 2021 were used as data sources, and CiteSpace was used to conduct scientific measurement analysis on the number of papers, authors, institutions and keywords. The research shows that the research on thermodynamic disaster in coal mine generally shows three stages: slow growth, steady growth and stable development. DENG Jun, WANG Deming, YU Minggao, WEN Hu are the main core authors in this field. China University of Mining and Technology, Xi’an University of Science and Technology, Liaoning Technical University, China University of Mining & Technology（Ｂｅｉｊｉｎｇ） are the main research institutions in this field. Hot keywords mainly focus on gas explosion, coal spontaneous combustion, numerical simulation, mined-out area, etc. The research emphasis in this field is mainly embodied in the research of spontaneous combustion characteristics of coal and gas explosion, in which numerical simulation is an important research method. At present, there are few studies on coal mine thermal power compound disasters and disaster monitoring and early warning. In the future, the research on these two aspects can be strengthened.
In order to explore the research trends of thermodynamic disaster in coal mine, based on the perspective of information visualization, 2 845 related papers published in CNKI database from 2002 to 2021 were used as data sources, and CiteSpace was used to conduct scientific measurement analysis on the number of papers, authors, institutions and keywords. The research shows that the research on thermodynamic disaster in coal mine generally shows three stages: slow growth, steady growth and stable development. DENG Jun, WANG Deming, YU Minggao, WEN Hu are the main core authors in this field. China University of Mining and Technology, Xi’an University of Science and Technology, Liaoning Technical University, China University of Mining & Technology（Ｂｅｉｊｉｎｇ） are the main research institutions in this field. Hot keywords mainly focus on gas explosion, coal spontaneous combustion, numerical simulation, mined-out area, etc. The research emphasis in this field is mainly embodied in the research of spontaneous combustion characteristics of coal and gas explosion, in which numerical simulation is an important research method. At present, there are few studies on coal mine thermal power compound disasters and disaster monitoring and early warning. In the future, the research on these two aspects can be strengthened.
2023, 54(3): 40-45.
Abstract：
Aiming at the problems of high temperature and high humidity in coal mining facing, this paper studies the heat distribution law of coal mining facing, compares and analyzes the enthalpy difference method and Sigma thermal difference method to calculate the air supply volume. Based on this, mechanical cooling scheme is scientifically formulated, and the cooling effect is verified by numerical simulation method. The results show that: the air supply calculated by Sigma heat is more accurate than that by traditional enthalpy difference method, and the air supply is 22.4 kg/s, that is, 1 041.6 m3/min. It can be seen from the simulation results that the RWK350 air cooler can achieve effective cooling below the Coal Mine Safety Regulations at both the common 10 m and 15 m air duct outlet locations, thus achieving effective cooling of the driving roadway.
Aiming at the problems of high temperature and high humidity in coal mining facing, this paper studies the heat distribution law of coal mining facing, compares and analyzes the enthalpy difference method and Sigma thermal difference method to calculate the air supply volume. Based on this, mechanical cooling scheme is scientifically formulated, and the cooling effect is verified by numerical simulation method. The results show that: the air supply calculated by Sigma heat is more accurate than that by traditional enthalpy difference method, and the air supply is 22.4 kg/s, that is, 1 041.6 m3/min. It can be seen from the simulation results that the RWK350 air cooler can achieve effective cooling below the Coal Mine Safety Regulations at both the common 10 m and 15 m air duct outlet locations, thus achieving effective cooling of the driving roadway.
Abstract：
This paper proposes a method to control the heat transfer from the surrounding rock to the roadway, that is, a new type of thermal insulation mortar is laid on the wall of the roadway surrounding rock, and the optimal proportion of three additives in the thermal insulation mortar is determined through orthogonal experiments, and the basic experimental measurement of the thermal insulation mortar under the optimal proportion is carried out. The experimental results show that with the increase of the three admixtures, the thermal conductivity of thermal insulation mortar decreases significantly, and the compressive strength decreases. When the content of fly ash ceramsite is 96%, the content of basalt fiber is 16%, and the content of expanded vermiculite is 16%, the performance of the specimen is the best.
This paper proposes a method to control the heat transfer from the surrounding rock to the roadway, that is, a new type of thermal insulation mortar is laid on the wall of the roadway surrounding rock, and the optimal proportion of three additives in the thermal insulation mortar is determined through orthogonal experiments, and the basic experimental measurement of the thermal insulation mortar under the optimal proportion is carried out. The experimental results show that with the increase of the three admixtures, the thermal conductivity of thermal insulation mortar decreases significantly, and the compressive strength decreases. When the content of fly ash ceramsite is 96%, the content of basalt fiber is 16%, and the content of expanded vermiculite is 16%, the performance of the specimen is the best.
Abstract：
In order to alleviate the problem of mine thermal damage, this paper proposes to put cold water pipe into the surrounding rock of roadway, and reduce the temperature of surrounding rock by intercepting the high temperature through the cold water pipe. According to the similarity principle, a cold water interception and cooling experimental system for high temperature surrounding rock was built. Experiments were conducted by changing cold water velocity, inlet time and surrounding rock temperature, etc. Combined with COMSOL simulation, the influence of different diameters and spacing layouts of cold water pipe on cold water interception and cooling effect of roadway surrounding rock was analyzed. The results show that when other conditions remain unchanged, the cooling range of surrounding rock increases with the increase of cold water velocity, inlet time and temperature difference between surrounding rock and cold water. When the diameter of the cold water pipe is 10 cm and the vertical distance is 2.5 m, the average temperature of the roadway wall after cooling is 23.4 ℃.
In order to alleviate the problem of mine thermal damage, this paper proposes to put cold water pipe into the surrounding rock of roadway, and reduce the temperature of surrounding rock by intercepting the high temperature through the cold water pipe. According to the similarity principle, a cold water interception and cooling experimental system for high temperature surrounding rock was built. Experiments were conducted by changing cold water velocity, inlet time and surrounding rock temperature, etc. Combined with COMSOL simulation, the influence of different diameters and spacing layouts of cold water pipe on cold water interception and cooling effect of roadway surrounding rock was analyzed. The results show that when other conditions remain unchanged, the cooling range of surrounding rock increases with the increase of cold water velocity, inlet time and temperature difference between surrounding rock and cold water. When the diameter of the cold water pipe is 10 cm and the vertical distance is 2.5 m, the average temperature of the roadway wall after cooling is 23.4 ℃.
Abstract：
In this paper, the deep hole and shallow hole temperature measurement technology is used to measure the rock temperature in No.13 mining area of Yangchangwan Coal Mine, and the cooling circle range of 937 m elevation roadway for the return air downhill in No.13 mining area and 430 m elevation roadway for the auxiliary transportation downhill in No.13 mining area are determined. The COMSOL software is used to analyze the surrounding rock temperature distribution, and the reliability of the surface borehole temperature measurement data is verified according to the temperature measurement results. Combined with the ground borehole temperature measurement data and the deep hole and shallow hole temperature measurement results, the ground temperature gradient and the heat damage area are defined, which provides a basis for the subsequent heat damage treatment.
In this paper, the deep hole and shallow hole temperature measurement technology is used to measure the rock temperature in No.13 mining area of Yangchangwan Coal Mine, and the cooling circle range of 937 m elevation roadway for the return air downhill in No.13 mining area and 430 m elevation roadway for the auxiliary transportation downhill in No.13 mining area are determined. The COMSOL software is used to analyze the surrounding rock temperature distribution, and the reliability of the surface borehole temperature measurement data is verified according to the temperature measurement results. Combined with the ground borehole temperature measurement data and the deep hole and shallow hole temperature measurement results, the ground temperature gradient and the heat damage area are defined, which provides a basis for the subsequent heat damage treatment.
2023, 54(3): 17-25.
Abstract：
In order to explore the influence of thermodynamic theory on the cooling characteristics of vortex tube control used to create artificial environment in mine, based on the first and second laws of thermodynamics are adopted to analyze the thermodynamic characteristics of fluid in vortex tube, the energy separation mechanism are explored, and the refrigeration characteristics are obtained. Using the three-dimensional fluid domain coupling method, the continuous-discontinuous model is established. Through the calculation of different mathematical models and different calculation methods, it is compared with the experimental results of Aljuwayhel. With the difference of refrigeration effect as the judgment index, the separation of pressure and velocity coupling variables is determined using the SIMPLEC algorithm. The anisotropic Reynolds stress RSM turbulence model is the most accurate, and the deviation of refrigeration effect is calculated within 12%. The analysis of the flow field in the vortex tube shows that the distribution of fluid velocity, fluid pressure and temperature flow field in the tube is basically consistent with the theory based on thermodynamic design. The simulation conclusion that the static temperature change caused by fluid temperature separation in the tube is caused by fluid heat and work conversion verifies the energy transfer process in the vortextube.
In order to explore the influence of thermodynamic theory on the cooling characteristics of vortex tube control used to create artificial environment in mine, based on the first and second laws of thermodynamics are adopted to analyze the thermodynamic characteristics of fluid in vortex tube, the energy separation mechanism are explored, and the refrigeration characteristics are obtained. Using the three-dimensional fluid domain coupling method, the continuous-discontinuous model is established. Through the calculation of different mathematical models and different calculation methods, it is compared with the experimental results of Aljuwayhel. With the difference of refrigeration effect as the judgment index, the separation of pressure and velocity coupling variables is determined using the SIMPLEC algorithm. The anisotropic Reynolds stress RSM turbulence model is the most accurate, and the deviation of refrigeration effect is calculated within 12%. The analysis of the flow field in the vortex tube shows that the distribution of fluid velocity, fluid pressure and temperature flow field in the tube is basically consistent with the theory based on thermodynamic design. The simulation conclusion that the static temperature change caused by fluid temperature separation in the tube is caused by fluid heat and work conversion verifies the energy transfer process in the vortextube.
Abstract：
A method of heat storage and temperature control for refuge chamber with phase change energy storage wall is put forward, that is, coupled temperature control method of mine air pressure, phase change cold storage for energy storage wall under conventional condition, and wall phase change heat absorption when mine accident occurs, the diatomaceous earth-based phase change material was used as the energy storage aggregate additive to prepare composite cement mortar, which was then laid on the wall of the refuge chamber to achieve temperature control effect. The test results show that when the amount of energy storage aggregate is 15% and the amount of activated carbon is 6%, the prepared composite cement mortar can be adapted to the energy storage wall structure of the refuge chamber and improve the indoor thermal environment of the refuge chamber.
A method of heat storage and temperature control for refuge chamber with phase change energy storage wall is put forward, that is, coupled temperature control method of mine air pressure, phase change cold storage for energy storage wall under conventional condition, and wall phase change heat absorption when mine accident occurs, the diatomaceous earth-based phase change material was used as the energy storage aggregate additive to prepare composite cement mortar, which was then laid on the wall of the refuge chamber to achieve temperature control effect. The test results show that when the amount of energy storage aggregate is 15% and the amount of activated carbon is 6%, the prepared composite cement mortar can be adapted to the energy storage wall structure of the refuge chamber and improve the indoor thermal environment of the refuge chamber.
2023, 54(3): 33-39.
Abstract：
In order to explore the research trends of thermodynamic disaster in coal mine, based on the perspective of information visualization, 2 845 related papers published in CNKI database from 2002 to 2021 were used as data sources, and CiteSpace was used to conduct scientific measurement analysis on the number of papers, authors, institutions and keywords. The research shows that the research on thermodynamic disaster in coal mine generally shows three stages: slow growth, steady growth and stable development. DENG Jun, WANG Deming, YU Minggao, WEN Hu are the main core authors in this field. China University of Mining and Technology, Xi’an University of Science and Technology, Liaoning Technical University, China University of Mining & Technology（Ｂｅｉｊｉｎｇ） are the main research institutions in this field. Hot keywords mainly focus on gas explosion, coal spontaneous combustion, numerical simulation, mined-out area, etc. The research emphasis in this field is mainly embodied in the research of spontaneous combustion characteristics of coal and gas explosion, in which numerical simulation is an important research method. At present, there are few studies on coal mine thermal power compound disasters and disaster monitoring and early warning. In the future, the research on these two aspects can be strengthened.
In order to explore the research trends of thermodynamic disaster in coal mine, based on the perspective of information visualization, 2 845 related papers published in CNKI database from 2002 to 2021 were used as data sources, and CiteSpace was used to conduct scientific measurement analysis on the number of papers, authors, institutions and keywords. The research shows that the research on thermodynamic disaster in coal mine generally shows three stages: slow growth, steady growth and stable development. DENG Jun, WANG Deming, YU Minggao, WEN Hu are the main core authors in this field. China University of Mining and Technology, Xi’an University of Science and Technology, Liaoning Technical University, China University of Mining & Technology（Ｂｅｉｊｉｎｇ） are the main research institutions in this field. Hot keywords mainly focus on gas explosion, coal spontaneous combustion, numerical simulation, mined-out area, etc. The research emphasis in this field is mainly embodied in the research of spontaneous combustion characteristics of coal and gas explosion, in which numerical simulation is an important research method. At present, there are few studies on coal mine thermal power compound disasters and disaster monitoring and early warning. In the future, the research on these two aspects can be strengthened.
2023, 54(3): 40-45.
Abstract：
Aiming at the problems of high temperature and high humidity in coal mining facing, this paper studies the heat distribution law of coal mining facing, compares and analyzes the enthalpy difference method and Sigma thermal difference method to calculate the air supply volume. Based on this, mechanical cooling scheme is scientifically formulated, and the cooling effect is verified by numerical simulation method. The results show that: the air supply calculated by Sigma heat is more accurate than that by traditional enthalpy difference method, and the air supply is 22.4 kg/s, that is, 1 041.6 m3/min. It can be seen from the simulation results that the RWK350 air cooler can achieve effective cooling below the Coal Mine Safety Regulations at both the common 10 m and 15 m air duct outlet locations, thus achieving effective cooling of the driving roadway.
Aiming at the problems of high temperature and high humidity in coal mining facing, this paper studies the heat distribution law of coal mining facing, compares and analyzes the enthalpy difference method and Sigma thermal difference method to calculate the air supply volume. Based on this, mechanical cooling scheme is scientifically formulated, and the cooling effect is verified by numerical simulation method. The results show that: the air supply calculated by Sigma heat is more accurate than that by traditional enthalpy difference method, and the air supply is 22.4 kg/s, that is, 1 041.6 m3/min. It can be seen from the simulation results that the RWK350 air cooler can achieve effective cooling below the Coal Mine Safety Regulations at both the common 10 m and 15 m air duct outlet locations, thus achieving effective cooling of the driving roadway.
Abstract：
This paper proposes a method to control the heat transfer from the surrounding rock to the roadway, that is, a new type of thermal insulation mortar is laid on the wall of the roadway surrounding rock, and the optimal proportion of three additives in the thermal insulation mortar is determined through orthogonal experiments, and the basic experimental measurement of the thermal insulation mortar under the optimal proportion is carried out. The experimental results show that with the increase of the three admixtures, the thermal conductivity of thermal insulation mortar decreases significantly, and the compressive strength decreases. When the content of fly ash ceramsite is 96%, the content of basalt fiber is 16%, and the content of expanded vermiculite is 16%, the performance of the specimen is the best.
This paper proposes a method to control the heat transfer from the surrounding rock to the roadway, that is, a new type of thermal insulation mortar is laid on the wall of the roadway surrounding rock, and the optimal proportion of three additives in the thermal insulation mortar is determined through orthogonal experiments, and the basic experimental measurement of the thermal insulation mortar under the optimal proportion is carried out. The experimental results show that with the increase of the three admixtures, the thermal conductivity of thermal insulation mortar decreases significantly, and the compressive strength decreases. When the content of fly ash ceramsite is 96%, the content of basalt fiber is 16%, and the content of expanded vermiculite is 16%, the performance of the specimen is the best.
Abstract：
In order to alleviate the problem of mine thermal damage, this paper proposes to put cold water pipe into the surrounding rock of roadway, and reduce the temperature of surrounding rock by intercepting the high temperature through the cold water pipe. According to the similarity principle, a cold water interception and cooling experimental system for high temperature surrounding rock was built. Experiments were conducted by changing cold water velocity, inlet time and surrounding rock temperature, etc. Combined with COMSOL simulation, the influence of different diameters and spacing layouts of cold water pipe on cold water interception and cooling effect of roadway surrounding rock was analyzed. The results show that when other conditions remain unchanged, the cooling range of surrounding rock increases with the increase of cold water velocity, inlet time and temperature difference between surrounding rock and cold water. When the diameter of the cold water pipe is 10 cm and the vertical distance is 2.5 m, the average temperature of the roadway wall after cooling is 23.4 ℃.
In order to alleviate the problem of mine thermal damage, this paper proposes to put cold water pipe into the surrounding rock of roadway, and reduce the temperature of surrounding rock by intercepting the high temperature through the cold water pipe. According to the similarity principle, a cold water interception and cooling experimental system for high temperature surrounding rock was built. Experiments were conducted by changing cold water velocity, inlet time and surrounding rock temperature, etc. Combined with COMSOL simulation, the influence of different diameters and spacing layouts of cold water pipe on cold water interception and cooling effect of roadway surrounding rock was analyzed. The results show that when other conditions remain unchanged, the cooling range of surrounding rock increases with the increase of cold water velocity, inlet time and temperature difference between surrounding rock and cold water. When the diameter of the cold water pipe is 10 cm and the vertical distance is 2.5 m, the average temperature of the roadway wall after cooling is 23.4 ℃.
Abstract：
In this paper, the deep hole and shallow hole temperature measurement technology is used to measure the rock temperature in No.13 mining area of Yangchangwan Coal Mine, and the cooling circle range of 937 m elevation roadway for the return air downhill in No.13 mining area and 430 m elevation roadway for the auxiliary transportation downhill in No.13 mining area are determined. The COMSOL software is used to analyze the surrounding rock temperature distribution, and the reliability of the surface borehole temperature measurement data is verified according to the temperature measurement results. Combined with the ground borehole temperature measurement data and the deep hole and shallow hole temperature measurement results, the ground temperature gradient and the heat damage area are defined, which provides a basis for the subsequent heat damage treatment.
In this paper, the deep hole and shallow hole temperature measurement technology is used to measure the rock temperature in No.13 mining area of Yangchangwan Coal Mine, and the cooling circle range of 937 m elevation roadway for the return air downhill in No.13 mining area and 430 m elevation roadway for the auxiliary transportation downhill in No.13 mining area are determined. The COMSOL software is used to analyze the surrounding rock temperature distribution, and the reliability of the surface borehole temperature measurement data is verified according to the temperature measurement results. Combined with the ground borehole temperature measurement data and the deep hole and shallow hole temperature measurement results, the ground temperature gradient and the heat damage area are defined, which provides a basis for the subsequent heat damage treatment.
2023, 54(3): 17-25.
Abstract：
In order to explore the influence of thermodynamic theory on the cooling characteristics of vortex tube control used to create artificial environment in mine, based on the first and second laws of thermodynamics are adopted to analyze the thermodynamic characteristics of fluid in vortex tube, the energy separation mechanism are explored, and the refrigeration characteristics are obtained. Using the three-dimensional fluid domain coupling method, the continuous-discontinuous model is established. Through the calculation of different mathematical models and different calculation methods, it is compared with the experimental results of Aljuwayhel. With the difference of refrigeration effect as the judgment index, the separation of pressure and velocity coupling variables is determined using the SIMPLEC algorithm. The anisotropic Reynolds stress RSM turbulence model is the most accurate, and the deviation of refrigeration effect is calculated within 12%. The analysis of the flow field in the vortex tube shows that the distribution of fluid velocity, fluid pressure and temperature flow field in the tube is basically consistent with the theory based on thermodynamic design. The simulation conclusion that the static temperature change caused by fluid temperature separation in the tube is caused by fluid heat and work conversion verifies the energy transfer process in the vortextube.
In order to explore the influence of thermodynamic theory on the cooling characteristics of vortex tube control used to create artificial environment in mine, based on the first and second laws of thermodynamics are adopted to analyze the thermodynamic characteristics of fluid in vortex tube, the energy separation mechanism are explored, and the refrigeration characteristics are obtained. Using the three-dimensional fluid domain coupling method, the continuous-discontinuous model is established. Through the calculation of different mathematical models and different calculation methods, it is compared with the experimental results of Aljuwayhel. With the difference of refrigeration effect as the judgment index, the separation of pressure and velocity coupling variables is determined using the SIMPLEC algorithm. The anisotropic Reynolds stress RSM turbulence model is the most accurate, and the deviation of refrigeration effect is calculated within 12%. The analysis of the flow field in the vortex tube shows that the distribution of fluid velocity, fluid pressure and temperature flow field in the tube is basically consistent with the theory based on thermodynamic design. The simulation conclusion that the static temperature change caused by fluid temperature separation in the tube is caused by fluid heat and work conversion verifies the energy transfer process in the vortextube.
Abstract：
A method of heat storage and temperature control for refuge chamber with phase change energy storage wall is put forward, that is, coupled temperature control method of mine air pressure, phase change cold storage for energy storage wall under conventional condition, and wall phase change heat absorption when mine accident occurs, the diatomaceous earth-based phase change material was used as the energy storage aggregate additive to prepare composite cement mortar, which was then laid on the wall of the refuge chamber to achieve temperature control effect. The test results show that when the amount of energy storage aggregate is 15% and the amount of activated carbon is 6%, the prepared composite cement mortar can be adapted to the energy storage wall structure of the refuge chamber and improve the indoor thermal environment of the refuge chamber.
A method of heat storage and temperature control for refuge chamber with phase change energy storage wall is put forward, that is, coupled temperature control method of mine air pressure, phase change cold storage for energy storage wall under conventional condition, and wall phase change heat absorption when mine accident occurs, the diatomaceous earth-based phase change material was used as the energy storage aggregate additive to prepare composite cement mortar, which was then laid on the wall of the refuge chamber to achieve temperature control effect. The test results show that when the amount of energy storage aggregate is 15% and the amount of activated carbon is 6%, the prepared composite cement mortar can be adapted to the energy storage wall structure of the refuge chamber and improve the indoor thermal environment of the refuge chamber.
2023, 54(3): 33-39.
Abstract：
In order to explore the research trends of thermodynamic disaster in coal mine, based on the perspective of information visualization, 2 845 related papers published in CNKI database from 2002 to 2021 were used as data sources, and CiteSpace was used to conduct scientific measurement analysis on the number of papers, authors, institutions and keywords. The research shows that the research on thermodynamic disaster in coal mine generally shows three stages: slow growth, steady growth and stable development. DENG Jun, WANG Deming, YU Minggao, WEN Hu are the main core authors in this field. China University of Mining and Technology, Xi’an University of Science and Technology, Liaoning Technical University, China University of Mining & Technology（Ｂｅｉｊｉｎｇ） are the main research institutions in this field. Hot keywords mainly focus on gas explosion, coal spontaneous combustion, numerical simulation, mined-out area, etc. The research emphasis in this field is mainly embodied in the research of spontaneous combustion characteristics of coal and gas explosion, in which numerical simulation is an important research method. At present, there are few studies on coal mine thermal power compound disasters and disaster monitoring and early warning. In the future, the research on these two aspects can be strengthened.
In order to explore the research trends of thermodynamic disaster in coal mine, based on the perspective of information visualization, 2 845 related papers published in CNKI database from 2002 to 2021 were used as data sources, and CiteSpace was used to conduct scientific measurement analysis on the number of papers, authors, institutions and keywords. The research shows that the research on thermodynamic disaster in coal mine generally shows three stages: slow growth, steady growth and stable development. DENG Jun, WANG Deming, YU Minggao, WEN Hu are the main core authors in this field. China University of Mining and Technology, Xi’an University of Science and Technology, Liaoning Technical University, China University of Mining & Technology（Ｂｅｉｊｉｎｇ） are the main research institutions in this field. Hot keywords mainly focus on gas explosion, coal spontaneous combustion, numerical simulation, mined-out area, etc. The research emphasis in this field is mainly embodied in the research of spontaneous combustion characteristics of coal and gas explosion, in which numerical simulation is an important research method. At present, there are few studies on coal mine thermal power compound disasters and disaster monitoring and early warning. In the future, the research on these two aspects can be strengthened.
2023, 54(3): 40-45.
Abstract：
Aiming at the problems of high temperature and high humidity in coal mining facing, this paper studies the heat distribution law of coal mining facing, compares and analyzes the enthalpy difference method and Sigma thermal difference method to calculate the air supply volume. Based on this, mechanical cooling scheme is scientifically formulated, and the cooling effect is verified by numerical simulation method. The results show that: the air supply calculated by Sigma heat is more accurate than that by traditional enthalpy difference method, and the air supply is 22.4 kg/s, that is, 1 041.6 m3/min. It can be seen from the simulation results that the RWK350 air cooler can achieve effective cooling below the Coal Mine Safety Regulations at both the common 10 m and 15 m air duct outlet locations, thus achieving effective cooling of the driving roadway.
Aiming at the problems of high temperature and high humidity in coal mining facing, this paper studies the heat distribution law of coal mining facing, compares and analyzes the enthalpy difference method and Sigma thermal difference method to calculate the air supply volume. Based on this, mechanical cooling scheme is scientifically formulated, and the cooling effect is verified by numerical simulation method. The results show that: the air supply calculated by Sigma heat is more accurate than that by traditional enthalpy difference method, and the air supply is 22.4 kg/s, that is, 1 041.6 m3/min. It can be seen from the simulation results that the RWK350 air cooler can achieve effective cooling below the Coal Mine Safety Regulations at both the common 10 m and 15 m air duct outlet locations, thus achieving effective cooling of the driving roadway.
Abstract：
This paper proposes a method to control the heat transfer from the surrounding rock to the roadway, that is, a new type of thermal insulation mortar is laid on the wall of the roadway surrounding rock, and the optimal proportion of three additives in the thermal insulation mortar is determined through orthogonal experiments, and the basic experimental measurement of the thermal insulation mortar under the optimal proportion is carried out. The experimental results show that with the increase of the three admixtures, the thermal conductivity of thermal insulation mortar decreases significantly, and the compressive strength decreases. When the content of fly ash ceramsite is 96%, the content of basalt fiber is 16%, and the content of expanded vermiculite is 16%, the performance of the specimen is the best.
This paper proposes a method to control the heat transfer from the surrounding rock to the roadway, that is, a new type of thermal insulation mortar is laid on the wall of the roadway surrounding rock, and the optimal proportion of three additives in the thermal insulation mortar is determined through orthogonal experiments, and the basic experimental measurement of the thermal insulation mortar under the optimal proportion is carried out. The experimental results show that with the increase of the three admixtures, the thermal conductivity of thermal insulation mortar decreases significantly, and the compressive strength decreases. When the content of fly ash ceramsite is 96%, the content of basalt fiber is 16%, and the content of expanded vermiculite is 16%, the performance of the specimen is the best.
Abstract：
In order to alleviate the problem of mine thermal damage, this paper proposes to put cold water pipe into the surrounding rock of roadway, and reduce the temperature of surrounding rock by intercepting the high temperature through the cold water pipe. According to the similarity principle, a cold water interception and cooling experimental system for high temperature surrounding rock was built. Experiments were conducted by changing cold water velocity, inlet time and surrounding rock temperature, etc. Combined with COMSOL simulation, the influence of different diameters and spacing layouts of cold water pipe on cold water interception and cooling effect of roadway surrounding rock was analyzed. The results show that when other conditions remain unchanged, the cooling range of surrounding rock increases with the increase of cold water velocity, inlet time and temperature difference between surrounding rock and cold water. When the diameter of the cold water pipe is 10 cm and the vertical distance is 2.5 m, the average temperature of the roadway wall after cooling is 23.4 ℃.
In order to alleviate the problem of mine thermal damage, this paper proposes to put cold water pipe into the surrounding rock of roadway, and reduce the temperature of surrounding rock by intercepting the high temperature through the cold water pipe. According to the similarity principle, a cold water interception and cooling experimental system for high temperature surrounding rock was built. Experiments were conducted by changing cold water velocity, inlet time and surrounding rock temperature, etc. Combined with COMSOL simulation, the influence of different diameters and spacing layouts of cold water pipe on cold water interception and cooling effect of roadway surrounding rock was analyzed. The results show that when other conditions remain unchanged, the cooling range of surrounding rock increases with the increase of cold water velocity, inlet time and temperature difference between surrounding rock and cold water. When the diameter of the cold water pipe is 10 cm and the vertical distance is 2.5 m, the average temperature of the roadway wall after cooling is 23.4 ℃.
Abstract：
In this paper, the deep hole and shallow hole temperature measurement technology is used to measure the rock temperature in No.13 mining area of Yangchangwan Coal Mine, and the cooling circle range of 937 m elevation roadway for the return air downhill in No.13 mining area and 430 m elevation roadway for the auxiliary transportation downhill in No.13 mining area are determined. The COMSOL software is used to analyze the surrounding rock temperature distribution, and the reliability of the surface borehole temperature measurement data is verified according to the temperature measurement results. Combined with the ground borehole temperature measurement data and the deep hole and shallow hole temperature measurement results, the ground temperature gradient and the heat damage area are defined, which provides a basis for the subsequent heat damage treatment.
In this paper, the deep hole and shallow hole temperature measurement technology is used to measure the rock temperature in No.13 mining area of Yangchangwan Coal Mine, and the cooling circle range of 937 m elevation roadway for the return air downhill in No.13 mining area and 430 m elevation roadway for the auxiliary transportation downhill in No.13 mining area are determined. The COMSOL software is used to analyze the surrounding rock temperature distribution, and the reliability of the surface borehole temperature measurement data is verified according to the temperature measurement results. Combined with the ground borehole temperature measurement data and the deep hole and shallow hole temperature measurement results, the ground temperature gradient and the heat damage area are defined, which provides a basis for the subsequent heat damage treatment.
2023, 54(3): 17-25.
Abstract：
In order to explore the influence of thermodynamic theory on the cooling characteristics of vortex tube control used to create artificial environment in mine, based on the first and second laws of thermodynamics are adopted to analyze the thermodynamic characteristics of fluid in vortex tube, the energy separation mechanism are explored, and the refrigeration characteristics are obtained. Using the three-dimensional fluid domain coupling method, the continuous-discontinuous model is established. Through the calculation of different mathematical models and different calculation methods, it is compared with the experimental results of Aljuwayhel. With the difference of refrigeration effect as the judgment index, the separation of pressure and velocity coupling variables is determined using the SIMPLEC algorithm. The anisotropic Reynolds stress RSM turbulence model is the most accurate, and the deviation of refrigeration effect is calculated within 12%. The analysis of the flow field in the vortex tube shows that the distribution of fluid velocity, fluid pressure and temperature flow field in the tube is basically consistent with the theory based on thermodynamic design. The simulation conclusion that the static temperature change caused by fluid temperature separation in the tube is caused by fluid heat and work conversion verifies the energy transfer process in the vortextube.
In order to explore the influence of thermodynamic theory on the cooling characteristics of vortex tube control used to create artificial environment in mine, based on the first and second laws of thermodynamics are adopted to analyze the thermodynamic characteristics of fluid in vortex tube, the energy separation mechanism are explored, and the refrigeration characteristics are obtained. Using the three-dimensional fluid domain coupling method, the continuous-discontinuous model is established. Through the calculation of different mathematical models and different calculation methods, it is compared with the experimental results of Aljuwayhel. With the difference of refrigeration effect as the judgment index, the separation of pressure and velocity coupling variables is determined using the SIMPLEC algorithm. The anisotropic Reynolds stress RSM turbulence model is the most accurate, and the deviation of refrigeration effect is calculated within 12%. The analysis of the flow field in the vortex tube shows that the distribution of fluid velocity, fluid pressure and temperature flow field in the tube is basically consistent with the theory based on thermodynamic design. The simulation conclusion that the static temperature change caused by fluid temperature separation in the tube is caused by fluid heat and work conversion verifies the energy transfer process in the vortextube.
Abstract：
A method of heat storage and temperature control for refuge chamber with phase change energy storage wall is put forward, that is, coupled temperature control method of mine air pressure, phase change cold storage for energy storage wall under conventional condition, and wall phase change heat absorption when mine accident occurs, the diatomaceous earth-based phase change material was used as the energy storage aggregate additive to prepare composite cement mortar, which was then laid on the wall of the refuge chamber to achieve temperature control effect. The test results show that when the amount of energy storage aggregate is 15% and the amount of activated carbon is 6%, the prepared composite cement mortar can be adapted to the energy storage wall structure of the refuge chamber and improve the indoor thermal environment of the refuge chamber.
A method of heat storage and temperature control for refuge chamber with phase change energy storage wall is put forward, that is, coupled temperature control method of mine air pressure, phase change cold storage for energy storage wall under conventional condition, and wall phase change heat absorption when mine accident occurs, the diatomaceous earth-based phase change material was used as the energy storage aggregate additive to prepare composite cement mortar, which was then laid on the wall of the refuge chamber to achieve temperature control effect. The test results show that when the amount of energy storage aggregate is 15% and the amount of activated carbon is 6%, the prepared composite cement mortar can be adapted to the energy storage wall structure of the refuge chamber and improve the indoor thermal environment of the refuge chamber.
2023, 54(3): 33-39.
Abstract：
In order to explore the research trends of thermodynamic disaster in coal mine, based on the perspective of information visualization, 2 845 related papers published in CNKI database from 2002 to 2021 were used as data sources, and CiteSpace was used to conduct scientific measurement analysis on the number of papers, authors, institutions and keywords. The research shows that the research on thermodynamic disaster in coal mine generally shows three stages: slow growth, steady growth and stable development. DENG Jun, WANG Deming, YU Minggao, WEN Hu are the main core authors in this field. China University of Mining and Technology, Xi’an University of Science and Technology, Liaoning Technical University, China University of Mining & Technology（Ｂｅｉｊｉｎｇ） are the main research institutions in this field. Hot keywords mainly focus on gas explosion, coal spontaneous combustion, numerical simulation, mined-out area, etc. The research emphasis in this field is mainly embodied in the research of spontaneous combustion characteristics of coal and gas explosion, in which numerical simulation is an important research method. At present, there are few studies on coal mine thermal power compound disasters and disaster monitoring and early warning. In the future, the research on these two aspects can be strengthened.
In order to explore the research trends of thermodynamic disaster in coal mine, based on the perspective of information visualization, 2 845 related papers published in CNKI database from 2002 to 2021 were used as data sources, and CiteSpace was used to conduct scientific measurement analysis on the number of papers, authors, institutions and keywords. The research shows that the research on thermodynamic disaster in coal mine generally shows three stages: slow growth, steady growth and stable development. DENG Jun, WANG Deming, YU Minggao, WEN Hu are the main core authors in this field. China University of Mining and Technology, Xi’an University of Science and Technology, Liaoning Technical University, China University of Mining & Technology（Ｂｅｉｊｉｎｇ） are the main research institutions in this field. Hot keywords mainly focus on gas explosion, coal spontaneous combustion, numerical simulation, mined-out area, etc. The research emphasis in this field is mainly embodied in the research of spontaneous combustion characteristics of coal and gas explosion, in which numerical simulation is an important research method. At present, there are few studies on coal mine thermal power compound disasters and disaster monitoring and early warning. In the future, the research on these two aspects can be strengthened.
2023, 54(3): 40-45.
Abstract：
Aiming at the problems of high temperature and high humidity in coal mining facing, this paper studies the heat distribution law of coal mining facing, compares and analyzes the enthalpy difference method and Sigma thermal difference method to calculate the air supply volume. Based on this, mechanical cooling scheme is scientifically formulated, and the cooling effect is verified by numerical simulation method. The results show that: the air supply calculated by Sigma heat is more accurate than that by traditional enthalpy difference method, and the air supply is 22.4 kg/s, that is, 1 041.6 m3/min. It can be seen from the simulation results that the RWK350 air cooler can achieve effective cooling below the Coal Mine Safety Regulations at both the common 10 m and 15 m air duct outlet locations, thus achieving effective cooling of the driving roadway.
Aiming at the problems of high temperature and high humidity in coal mining facing, this paper studies the heat distribution law of coal mining facing, compares and analyzes the enthalpy difference method and Sigma thermal difference method to calculate the air supply volume. Based on this, mechanical cooling scheme is scientifically formulated, and the cooling effect is verified by numerical simulation method. The results show that: the air supply calculated by Sigma heat is more accurate than that by traditional enthalpy difference method, and the air supply is 22.4 kg/s, that is, 1 041.6 m3/min. It can be seen from the simulation results that the RWK350 air cooler can achieve effective cooling below the Coal Mine Safety Regulations at both the common 10 m and 15 m air duct outlet locations, thus achieving effective cooling of the driving roadway.
Abstract：
This paper proposes a method to control the heat transfer from the surrounding rock to the roadway, that is, a new type of thermal insulation mortar is laid on the wall of the roadway surrounding rock, and the optimal proportion of three additives in the thermal insulation mortar is determined through orthogonal experiments, and the basic experimental measurement of the thermal insulation mortar under the optimal proportion is carried out. The experimental results show that with the increase of the three admixtures, the thermal conductivity of thermal insulation mortar decreases significantly, and the compressive strength decreases. When the content of fly ash ceramsite is 96%, the content of basalt fiber is 16%, and the content of expanded vermiculite is 16%, the performance of the specimen is the best.
This paper proposes a method to control the heat transfer from the surrounding rock to the roadway, that is, a new type of thermal insulation mortar is laid on the wall of the roadway surrounding rock, and the optimal proportion of three additives in the thermal insulation mortar is determined through orthogonal experiments, and the basic experimental measurement of the thermal insulation mortar under the optimal proportion is carried out. The experimental results show that with the increase of the three admixtures, the thermal conductivity of thermal insulation mortar decreases significantly, and the compressive strength decreases. When the content of fly ash ceramsite is 96%, the content of basalt fiber is 16%, and the content of expanded vermiculite is 16%, the performance of the specimen is the best.
Abstract：
In order to alleviate the problem of mine thermal damage, this paper proposes to put cold water pipe into the surrounding rock of roadway, and reduce the temperature of surrounding rock by intercepting the high temperature through the cold water pipe. According to the similarity principle, a cold water interception and cooling experimental system for high temperature surrounding rock was built. Experiments were conducted by changing cold water velocity, inlet time and surrounding rock temperature, etc. Combined with COMSOL simulation, the influence of different diameters and spacing layouts of cold water pipe on cold water interception and cooling effect of roadway surrounding rock was analyzed. The results show that when other conditions remain unchanged, the cooling range of surrounding rock increases with the increase of cold water velocity, inlet time and temperature difference between surrounding rock and cold water. When the diameter of the cold water pipe is 10 cm and the vertical distance is 2.5 m, the average temperature of the roadway wall after cooling is 23.4 ℃.
In order to alleviate the problem of mine thermal damage, this paper proposes to put cold water pipe into the surrounding rock of roadway, and reduce the temperature of surrounding rock by intercepting the high temperature through the cold water pipe. According to the similarity principle, a cold water interception and cooling experimental system for high temperature surrounding rock was built. Experiments were conducted by changing cold water velocity, inlet time and surrounding rock temperature, etc. Combined with COMSOL simulation, the influence of different diameters and spacing layouts of cold water pipe on cold water interception and cooling effect of roadway surrounding rock was analyzed. The results show that when other conditions remain unchanged, the cooling range of surrounding rock increases with the increase of cold water velocity, inlet time and temperature difference between surrounding rock and cold water. When the diameter of the cold water pipe is 10 cm and the vertical distance is 2.5 m, the average temperature of the roadway wall after cooling is 23.4 ℃.
Abstract：
In this paper, the deep hole and shallow hole temperature measurement technology is used to measure the rock temperature in No.13 mining area of Yangchangwan Coal Mine, and the cooling circle range of 937 m elevation roadway for the return air downhill in No.13 mining area and 430 m elevation roadway for the auxiliary transportation downhill in No.13 mining area are determined. The COMSOL software is used to analyze the surrounding rock temperature distribution, and the reliability of the surface borehole temperature measurement data is verified according to the temperature measurement results. Combined with the ground borehole temperature measurement data and the deep hole and shallow hole temperature measurement results, the ground temperature gradient and the heat damage area are defined, which provides a basis for the subsequent heat damage treatment.
In this paper, the deep hole and shallow hole temperature measurement technology is used to measure the rock temperature in No.13 mining area of Yangchangwan Coal Mine, and the cooling circle range of 937 m elevation roadway for the return air downhill in No.13 mining area and 430 m elevation roadway for the auxiliary transportation downhill in No.13 mining area are determined. The COMSOL software is used to analyze the surrounding rock temperature distribution, and the reliability of the surface borehole temperature measurement data is verified according to the temperature measurement results. Combined with the ground borehole temperature measurement data and the deep hole and shallow hole temperature measurement results, the ground temperature gradient and the heat damage area are defined, which provides a basis for the subsequent heat damage treatment.
2023, 54(3): 17-25.
Abstract：
In order to explore the influence of thermodynamic theory on the cooling characteristics of vortex tube control used to create artificial environment in mine, based on the first and second laws of thermodynamics are adopted to analyze the thermodynamic characteristics of fluid in vortex tube, the energy separation mechanism are explored, and the refrigeration characteristics are obtained. Using the three-dimensional fluid domain coupling method, the continuous-discontinuous model is established. Through the calculation of different mathematical models and different calculation methods, it is compared with the experimental results of Aljuwayhel. With the difference of refrigeration effect as the judgment index, the separation of pressure and velocity coupling variables is determined using the SIMPLEC algorithm. The anisotropic Reynolds stress RSM turbulence model is the most accurate, and the deviation of refrigeration effect is calculated within 12%. The analysis of the flow field in the vortex tube shows that the distribution of fluid velocity, fluid pressure and temperature flow field in the tube is basically consistent with the theory based on thermodynamic design. The simulation conclusion that the static temperature change caused by fluid temperature separation in the tube is caused by fluid heat and work conversion verifies the energy transfer process in the vortextube.
In order to explore the influence of thermodynamic theory on the cooling characteristics of vortex tube control used to create artificial environment in mine, based on the first and second laws of thermodynamics are adopted to analyze the thermodynamic characteristics of fluid in vortex tube, the energy separation mechanism are explored, and the refrigeration characteristics are obtained. Using the three-dimensional fluid domain coupling method, the continuous-discontinuous model is established. Through the calculation of different mathematical models and different calculation methods, it is compared with the experimental results of Aljuwayhel. With the difference of refrigeration effect as the judgment index, the separation of pressure and velocity coupling variables is determined using the SIMPLEC algorithm. The anisotropic Reynolds stress RSM turbulence model is the most accurate, and the deviation of refrigeration effect is calculated within 12%. The analysis of the flow field in the vortex tube shows that the distribution of fluid velocity, fluid pressure and temperature flow field in the tube is basically consistent with the theory based on thermodynamic design. The simulation conclusion that the static temperature change caused by fluid temperature separation in the tube is caused by fluid heat and work conversion verifies the energy transfer process in the vortextube.
Abstract：
A method of heat storage and temperature control for refuge chamber with phase change energy storage wall is put forward, that is, coupled temperature control method of mine air pressure, phase change cold storage for energy storage wall under conventional condition, and wall phase change heat absorption when mine accident occurs, the diatomaceous earth-based phase change material was used as the energy storage aggregate additive to prepare composite cement mortar, which was then laid on the wall of the refuge chamber to achieve temperature control effect. The test results show that when the amount of energy storage aggregate is 15% and the amount of activated carbon is 6%, the prepared composite cement mortar can be adapted to the energy storage wall structure of the refuge chamber and improve the indoor thermal environment of the refuge chamber.
A method of heat storage and temperature control for refuge chamber with phase change energy storage wall is put forward, that is, coupled temperature control method of mine air pressure, phase change cold storage for energy storage wall under conventional condition, and wall phase change heat absorption when mine accident occurs, the diatomaceous earth-based phase change material was used as the energy storage aggregate additive to prepare composite cement mortar, which was then laid on the wall of the refuge chamber to achieve temperature control effect. The test results show that when the amount of energy storage aggregate is 15% and the amount of activated carbon is 6%, the prepared composite cement mortar can be adapted to the energy storage wall structure of the refuge chamber and improve the indoor thermal environment of the refuge chamber.
2023, 54(3): 33-39.
Abstract：
In order to explore the research trends of thermodynamic disaster in coal mine, based on the perspective of information visualization, 2 845 related papers published in CNKI database from 2002 to 2021 were used as data sources, and CiteSpace was used to conduct scientific measurement analysis on the number of papers, authors, institutions and keywords. The research shows that the research on thermodynamic disaster in coal mine generally shows three stages: slow growth, steady growth and stable development. DENG Jun, WANG Deming, YU Minggao, WEN Hu are the main core authors in this field. China University of Mining and Technology, Xi’an University of Science and Technology, Liaoning Technical University, China University of Mining & Technology（Ｂｅｉｊｉｎｇ） are the main research institutions in this field. Hot keywords mainly focus on gas explosion, coal spontaneous combustion, numerical simulation, mined-out area, etc. The research emphasis in this field is mainly embodied in the research of spontaneous combustion characteristics of coal and gas explosion, in which numerical simulation is an important research method. At present, there are few studies on coal mine thermal power compound disasters and disaster monitoring and early warning. In the future, the research on these two aspects can be strengthened.
In order to explore the research trends of thermodynamic disaster in coal mine, based on the perspective of information visualization, 2 845 related papers published in CNKI database from 2002 to 2021 were used as data sources, and CiteSpace was used to conduct scientific measurement analysis on the number of papers, authors, institutions and keywords. The research shows that the research on thermodynamic disaster in coal mine generally shows three stages: slow growth, steady growth and stable development. DENG Jun, WANG Deming, YU Minggao, WEN Hu are the main core authors in this field. China University of Mining and Technology, Xi’an University of Science and Technology, Liaoning Technical University, China University of Mining & Technology（Ｂｅｉｊｉｎｇ） are the main research institutions in this field. Hot keywords mainly focus on gas explosion, coal spontaneous combustion, numerical simulation, mined-out area, etc. The research emphasis in this field is mainly embodied in the research of spontaneous combustion characteristics of coal and gas explosion, in which numerical simulation is an important research method. At present, there are few studies on coal mine thermal power compound disasters and disaster monitoring and early warning. In the future, the research on these two aspects can be strengthened.
2023, 54(3): 40-45.
Abstract：
Aiming at the problems of high temperature and high humidity in coal mining facing, this paper studies the heat distribution law of coal mining facing, compares and analyzes the enthalpy difference method and Sigma thermal difference method to calculate the air supply volume. Based on this, mechanical cooling scheme is scientifically formulated, and the cooling effect is verified by numerical simulation method. The results show that: the air supply calculated by Sigma heat is more accurate than that by traditional enthalpy difference method, and the air supply is 22.4 kg/s, that is, 1 041.6 m3/min. It can be seen from the simulation results that the RWK350 air cooler can achieve effective cooling below the Coal Mine Safety Regulations at both the common 10 m and 15 m air duct outlet locations, thus achieving effective cooling of the driving roadway.
Aiming at the problems of high temperature and high humidity in coal mining facing, this paper studies the heat distribution law of coal mining facing, compares and analyzes the enthalpy difference method and Sigma thermal difference method to calculate the air supply volume. Based on this, mechanical cooling scheme is scientifically formulated, and the cooling effect is verified by numerical simulation method. The results show that: the air supply calculated by Sigma heat is more accurate than that by traditional enthalpy difference method, and the air supply is 22.4 kg/s, that is, 1 041.6 m3/min. It can be seen from the simulation results that the RWK350 air cooler can achieve effective cooling below the Coal Mine Safety Regulations at both the common 10 m and 15 m air duct outlet locations, thus achieving effective cooling of the driving roadway.
Abstract：
This paper proposes a method to control the heat transfer from the surrounding rock to the roadway, that is, a new type of thermal insulation mortar is laid on the wall of the roadway surrounding rock, and the optimal proportion of three additives in the thermal insulation mortar is determined through orthogonal experiments, and the basic experimental measurement of the thermal insulation mortar under the optimal proportion is carried out. The experimental results show that with the increase of the three admixtures, the thermal conductivity of thermal insulation mortar decreases significantly, and the compressive strength decreases. When the content of fly ash ceramsite is 96%, the content of basalt fiber is 16%, and the content of expanded vermiculite is 16%, the performance of the specimen is the best.
This paper proposes a method to control the heat transfer from the surrounding rock to the roadway, that is, a new type of thermal insulation mortar is laid on the wall of the roadway surrounding rock, and the optimal proportion of three additives in the thermal insulation mortar is determined through orthogonal experiments, and the basic experimental measurement of the thermal insulation mortar under the optimal proportion is carried out. The experimental results show that with the increase of the three admixtures, the thermal conductivity of thermal insulation mortar decreases significantly, and the compressive strength decreases. When the content of fly ash ceramsite is 96%, the content of basalt fiber is 16%, and the content of expanded vermiculite is 16%, the performance of the specimen is the best.
