Study on fluid heat transfer in porous media in goaf

CHENG Genyin; LUO Songtao; SI Junhong; LI Lin

Safety in Coal Mines > 2022 > 53(9): 71-76.

CHENG Genyin, LUO Songtao, SI Junhong, LI Lin. Study on fluid heat transfer in porous media in goaf[J]. Safety in Coal Mines, 2022, 53(9): 71-76.

Citation:

CHENG Genyin, LUO Songtao, SI Junhong, LI Lin. Study on fluid heat transfer in porous media in goaf[J]. Safety in Coal Mines, 2022, 53(9): 71-76.

Citation:

CHENG Genyin, LUO Songtao, SI Junhong, LI Lin. Study on fluid heat transfer in porous media in goaf[J]. Safety in Coal Mines, 2022, 53(9): 71-76.

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Study on fluid heat transfer in porous media in goaf

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Published Date: September 19, 2022

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Abstract

Abstract

With the increasing mining depth of the mine, the high temperature and heat damage of the mining face is becoming more and more serious, and the phenomenon of spontaneous combustion of residual coal is particularly obvious, which seriously affects the safety production of the mine. In order to study the heat transfer law of fluid in porous media in goaf and analyze the influencing factors of porous media heat transfer, a porous media model of goaf is established by taking the 7271 working face of Yaoqiao Coal Mine as an example, and Fluent numerical simulation method is used to simulate the changes of gas concentration and temperature field in goaf under different wind speeds and different heat source positions. The results show that with the increase of wind speed, the range of “three zones” of spontaneous combustion in goaf moves to the depth of goaf, and the influence range of “three zones” of spontaneous combustion in air inlet side is larger than that in air return side. The closer the heat source is to the air inlet tunnel, the higher the overall temperature of the goaf. Increasing the air inlet tunnel wind speed can effectively reduce the internal temperature of the goaf and reduce the fluid heat transfer efficiency in porous media.
- goaf,
- porous media,
- heat transfer,
- numerical simulation,
- heat damage,
- spontaneous combustion

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