煤低温贫氧氧化放热特性研究
Study on Low-Temperature Oxidation Characteristics of Coal Under Oxygen Deficient Atmosphere
-
摘要: 煤的氧化放热特性是影响煤自燃的关键因素之一。为研究煤低温贫氧氧化放热特性,采用C80微量热仪,测试了煤在不同氧浓度环境(5%、9%、13%、17%、21%)中250 ℃以下的氧化放热热流曲线,分析了初始放热温度、放热量,并计算了表观活化能。结果表明:煤低温氧化初始放热温度随着氧浓度的降低呈波动增大的趋势;放热强度、放热量和表观活化能随着氧浓度的降低而降低,且存在临界氧浓度,使低于该氧浓度时,煤低温氧化放热行为受到明显抑制,实验煤样均存在2个临界氧浓度,分别为13%和9%。Abstract: Heat release characteristic of coal oxidation is one of the key factors influencing spontaneous combustion. To investigate the heat release characteristics of coal low-temperature oxidation under oxygen deficient atmosphere, by C80 calvet calorimeter, the heat flow of coal oxidation below 250 ℃ was tested under various atmospheres with 5%, 9%, 13%, 17%, and 21% oxygen concentrations. The initial temperature of heat release and quantity of heat release were analyzed. Furthermore, the apparent activation energy of coal oxidation was calculated. The results show that the initial temperature of heat release of coal fluctuates and increases with the decrease of oxygen concentration, while the intensity and quantity of heat release and apparent activation energy decrease. Moreover, there is a critical oxygen concentration, below which the heat release behaviors during coal oxidation will be inhibited obviously. There are two critical oxygen concentrations foreach of the tested coal samples, namely, 13% and 9%.
-
-
[1] 朱红青,赵鸿儒,李珂,等.气煤自燃特征参数规律研究[J].煤矿安全,2019,50(2):19-24. [2] 陈晓坤,易欣,邓军.煤特征放热强度的实验研究[J]. 煤炭学报,2005,30(5):623-626. [3] Deng J, Xiao Y, Li Q W, et al. Experimental studies of spontaneous combustion and anaerobic cooling of coal [J]. Fuel, 2015, 157: 261-269. [4] 肖兵球,王芹,李冬军,等.采用绝热式自燃测试方法分析煤的自燃倾向[J].煤质技术,2020,35(2):87. [5] Yang Y L, Li Z H, Hou S S, et al. The shortest period of coal spontaneous combustion on the basis of oxidative heat release intensity[J]. International Journal of Mining Science and Technology, 2014, 24: 99-103. [6] 周西华,白刚,聂荣山,等.不同变质程度煤自燃特征参数实验研究[J].辽宁工程技术大学学报(自然科学版),2018,37(1):37-42. [7] 周西华,牛玉平,白刚.供风量对褐煤自燃特性参数影响的实验研究[J].矿业安全与环保,2020,47(1): 31-35. [8] 程根银,周逸飞,程宥,等.蒙西侏罗纪煤差示扫描量热试验及动力学研究[J].中国煤炭,2016,42(11): 91-95. [9] 贾廷贵,娄和壮,刘剑,等.不同水分含量煤自燃过程热特性实验研究[J/OL].煤炭学报:1-7[2020-08-26].https://doi.org/10.13225/j.cnki.jccs.2019.1080. [10] 王亚超,袁泉,肖旸,等.水分对白皎无烟煤氧化过程放热特性的影响[J].西安科技大学学报,2018,35(5):721-727. [11] 邓军,赵婧昱,张嬿妮,等.煤样两次程序升温自燃特性对比实验研究[J].西安科技大学学报,2016,33(2):157-162. [12] 金永飞,李海涛,岳宁芳,等.变氧浓度环境下煤自然发火气体预报指标优选[J].煤矿安全,2014,45(11):27-30. [13] 徐永亮,宋志鹏,王少坤,等.贫氧环境对煤低温氧化特性影响研究[J].中国安全生产科学技术,2016, 12(11):82-87. [14] 刘峰峰,李海涛.变氧浓度环境下煤自燃临界温度及影响因素分析[J].煤炭技术,2017,36(4):165-168. [15] Deng J, Li Q W, Xiao Y, et al. The effect of oxygen concentration on the non-isothermal combustion of coal[J]. ThermochimicaActa, 2017, 653:106-115. [16] Ren L F, Deng J, Li Q W, et al. Low-temperature exothermic oxidation characteristics and spontaneous combustion risk of pulverised coal[J]. Fuel, 2019, 252: 238-245. [17] Qi G S, Wang D M, Zheng K M, et al. Kinetics characteristics of coal low-temperature oxidation in oxygen-depleted air[J]. Journal of Loss Prevention in the Process Industries,2015,35:224-231. [18] 朱红青,沈静,王海燕,等.氧气浓度与煤氧化特征关系的热重实验研究[J].煤矿安全,2014,45(5):16. [19] Li H J, Chi H Y, Hu S, et al. Effect of oxygen concentration on combustion behavior of single coal pellets from three different ranks in a concentrating photothermalreactor[J]. Fuel, 2020, 269:117372. [20] 陆伟,胡千庭,仲晓星,等.煤自燃逐步自活化反应理论[J].中国矿业大学学报,2007,36(1):111-115. [21] 何翔,刘建忠,杨雨濛,等.基于热重红外联用技术的不同煤种燃烧特性研究[J].热力发电,2016,45(11):29-35. -
期刊类型引用(7)
1. 杨荣，高春，刘超. 氧气体积分数对煤自燃热效应的影响研究. 能源与节能. 2024(10): 33-36 . 
百度学术
2. 张玉涛，杨杰，李亚清，史学强，张园勃，林国铖. 氧气浓度和升温速率对煤自燃特性影响. 安全与环境学报. 2023(01): 43-48 . 百度学术
3. 范宁，钟凯琪，苏龙. 不同氧浓度作用下煤氧化自燃热动力学特性. 陕西煤炭. 2022(02): 12-17 . 百度学术
4. 李昔遥，高峰，王正，杨云成，刘乐. 大佛寺煤矿采空区瓦斯对煤低温氧化特性的影响. 中国资源综合利用. 2022(05): 63-66 . 百度学术
5. 赵婧昱，卢世平，宋佳佳，邓军，刘卓然. 基于微观结构和气体产物特征的风化煤与氧化煤自燃差异研究. 煤矿安全. 2022(06): 26-36 . 本站查看
6. 朱伟，李星，李悦，郑志刚，李科心，赵婧昱. 抚顺西露天矿长焰煤高温氧化自燃特性实验研究. 煤矿安全. 2022(12): 1-7+14 . 本站查看
7. 郭军，金彦，郑学召，蔡国斌，宋玉姗. 基于萃取技术的煤自燃抑制机理研究及展望. 煤炭科学技术. 2021(03): 92-99 . 百度学术
其他类型引用(10)
计量
- 文章访问数: 34
- HTML全文浏览量: 0
- PDF下载量: 0
- 被引次数: 17
下载:
