Study on gas adsorption process of coal at low and variable temperature

doi:10.16265/j.cnki.issn1003-3033.2019.10.019

Abstract

Abstract: In order to ensure reliability and accuracy of measured results of coal seam gas content, freezing core sample technology was introduced, an experimental study on coal gas adsorption process was conducted at low temperature and variable temperature by using high and low temperature adsorption test device, and variation characteristics of gas adsorption capacity during cooling process was analyzed. The results show that during programmed cooling process, temperature of coal samples in tanks slowly decreases first and then tends to be stable, and these changes generally happen in the first three hours after which temperature will maintain stable and basically close with that of external environment. During experimental cooling process, adsorption capacity would increases and decrease alternately (increase for general trend) before it achieves a stable status along with stability of temperature. It is also found that adsorption capacity decrease stage basically shows a linear change trend with a decline rate increasing first and then decreasing.

Key words: coal gas, low and variable temperature, coal sample temperature, change of adsorption capacity, linear equation

CLC Number:

X936

MA Shujun, WANG Zhaofeng, REN Haoyang, HAN Enguang, WANG Bin. Study on gas adsorption process of coal at low and variable temperature[J]. China Safety Science Journal, 2019, 29(10): 124-129.

References

[1] 王兆丰, 刘军. 我国煤矿瓦斯抽放存在的问题及对策探讨[J]. 煤矿安全, 2005,36(3): 29-32.
WANG Zhaofeng, LIU Jun. Problems and countermeasures of gas drainage in coal mines in China [J]. Safety in Coal Mines, 2005,36(3): 29-32.
[2] 张宏图,魏建平,王云刚,等. 煤层瓦斯含量测定定点取样方法研究进展[J]. 中国安全生产科学技术, 2016,12(1): 186-192.
ZHANG Hongtu,WEI Jianping,WANG Yungang,et al. Sampling methods for coalbed gas content direct determination [J].Journal of Safety Science and Technology, 2016,12(1): 186-192.
[3] 陈向军,王兆丰,王林. 取样过程中损失瓦斯量推算模型研究[J]. 煤矿安全, 2013,44(9):21-33, 37.
CHEN Xiangjun,WANG Zhaofeng,WANG Lin. Research on gas loss quantity prediction model in sampling process [J]. Safety in Coal Mines, 2013,44(9):21-33, 37.
[4] WANG Zhaofeng,TANG Xu,YUE Gaowei,et al. Physical simulation of temperature influence on methane sorption and kinetics in coal: benefits of temperature under 273.15 K [J]. Fuel, 2015,158:207-216.
[5] 王兆丰,岳高伟,康博,等. 低温环境对煤的瓦斯解吸抑制效应试验[J]. 重庆大学学报, 2014,37(9):106-112,143.
WANG Zhaofeng,YUE Gaowei,KANG Bo,et al. Gas desorption inhibitory effect of coal in low temperature environment [J].Journal of Chongqing University, 2014,37(9):106-112,143.
[6] 闫江伟,薄增钦,杨亚磊. 纳米级孔隙对构造煤吸附瓦斯能力的影响[J].中国安全科学学报,2018,28(10): 131-136.
YAN Jiangwei,BO Zengqin,YANG Yalei. Influence of nanoscale pore on gas adsorption capacity of deformed coal [J]. China Safety Science Journal,2018,28(10): 131-136.
[7] 张占存,马丕梁. 水分对不同煤种瓦斯吸附特性影响的实验研究[J]. 煤炭学报, 2008,33(2): 144-147.
ZHANG Zhancun,MA Piliang. Experimental on moisture effects on the gas absorption speciality of different kinds of coal [J].Journal of China Coal Society, 2008,33(2): 144-147.
[8] 张凯,汤达祯,陶树, 等. 不同变质程度煤吸附能力影响因素研究[J]. 煤炭科学技术, 2016,45(5): 192-197.
ZHANG Kai, TANG Dazhen,TAO Shu,et al. Study on influence factors of adsorption capacity of different metamorphic degree coals [J]. Coal Science and Technology, 2016,45(5): 192-197.
[9] 张庆玲,崔永君,曹利戈.压力对不同变质程度煤的吸附性能影响分析[J].天然气工业,2004(1):98-100, 111.
ZHANG Qingling,CUI Yongjun,CAO Lige. Influence of pressure on adsorption ability of coal with different deterioration level [J]. Natural Gas Industry, 2004(1):98-100, 111.
[10] 李树刚,安朝峰,林海飞,等. 多因素影响下煤层吸附甲烷特性试验研究[J]. 煤炭科学技术, 2014,42(6): 40-44.
LI Shugang,AN Zhaofeng,LIN Haifei,et al. Research on characteristics of methane adsorption in coal seam under the conditions of multiple factors [J]. Coal Science and Technology, 2014,42(6): 40-44.
[11] 刘保县,鲜学福,徐龙君,等.地球物理场对煤吸附瓦斯特性的影响[J].重庆大学学报:自然科学版,2000,23(5): 78-81.
LIU Baoxian, XIAN Xuefu, XU Longjun, et al. Study on adsorption characteristics of coal to gas in geophysical field [J]. Journal of Chongqing University: Natural Science, 2000,23(5): 78-81.
[12] 张天军,许鸿杰,李树刚,等. 温度对煤吸附性能的影响[J].煤炭学报,2009,34(6): 802-805.
ZHANG Tianjun,XU Hongjie,LI Shugang, et al. The effect of temperature on adsorbing capability of coal [J]. Journal of China Coal Society, 2009,34(6): 802-805.
[13] 钟玲文,郑玉柱,员争荣, 等. 煤在温度和压力综合影响下的吸附性能及气含量预测[J].煤炭学报,2002, 27(6): 581-585.
ZHONG Lingwen, ZHENG Yuzhu, YUAN Zhengrong, et al. The adsorption capability of coal under integrated influence of temperature and pressure and predicted of content quantity of coal bed gas. [J]. Journal of China Coal Society, 2002,27(6): 581-585.
[14] 王刚,程卫民,潘刚. 温度对煤体吸附瓦斯性能影响的研究[J]. 安全与环境学报, 2012,12(5): 231-234.
WANG Gang,CHENG Weimin,PAN Gang. Influence of temperature on coal' s adsorbing capability [J]. Journal of Safety and Environment, 2012,12(5): 231-234.
[15] 王志军,宋文婷,马小童,等. 温度对煤体瓦斯吸附特性影响实验分析[J]. 河南理工大学学报:自然科学版, 2014,33(5): 553-557.
WANG Zhijun,SONG Wenting,MA Xiaotong,et al. Analysis of experiments for the effect of temperature on adsorbing capability of coal [J]. Journal of Henan Polytechnic University:Natural Science, 2014, 33(5): 553-557.
[16] 任浩洋. 煤芯变温条件下吸附／解吸特性实验研究[D]. 焦作:河南理工大学, 2015.
REN Haoyang. Experiment research on gas adsorption and desorption laws of coal in variable temperature environment [D].Jiaozuo:Henan Polytechnic University, 2015.
[17] 马向攀,王兆丰,任浩洋. 煤吸附甲烷能力对温度压力变化的响应特性[J]. 煤矿安全, 2016,47(12): 8-11.
MA Xiangpan,WANG Zhaofeng,REN Haoyang. Response characteristics of coal adsorbing CH₄ capability under variation of temperature and pressure [J]. Safety in Coal Mines, 2016,47(12): 8-11.