软硬煤孔隙结构特征及对变压解吸规律的影响
Pore Structure of Soft and Hard Coal and Its Influence on Gas Desorption Characteristics Under Variable Pressure
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摘要: 以河南平煤十矿、郜成矿和贵州新田矿的硬煤和软煤为研究对象，通过变压解吸实验分析煤样在变压条件下的解吸规律，并结合压汞实验，从孔隙结构层面分析硬煤和软煤变压解吸的控制机理。结果表明：变压解吸过程中，所有煤样解吸速率均由最大初始值随时间逐渐减小；不同压力值下的解吸量随压力变化上下波动，整体呈现逐渐降低趋势；当压力降至3 MPa以下时，由于在连通的中孔及大孔中解吸出的气体压力不足以持续克服毛细管压力，波动幅度急剧加大；同等压降条件下，软煤比硬煤解吸量更大；总体上软煤解吸速率更快，累计解吸量更多。Abstract: The hard coal and soft coal from No.10 Mine in Henan Pingdingshan, Gaocheng Mine and Guizhou Xintian Mine was selected to carry out mercury intrusion experiments and gas desorption experiments under the condition of changeable pressure. The pore structure characteristics and gas desorption laws are analyzed. The results show that the desorption rate of all coal samples decreases from the maximum initial value with the time during the process of changeable pressure desorption. The desorbed gas amount is up and down under different pressure, the overall trend is gradually decreasing. While the pressure is below 3 MPa, the fluctuation increases sharply because the desorbed gas pressure in the connected mesopores and macropores is not sufficient to continuously overcome the capillary pressure. The soft coal has more desorption capacity than hard coal under the same pressure drop condition. The desorption rate of soft coal is faster and the accumulated desorption amount is more.
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Keywords:
- pressure swing desorption /
- desorption rate /
- desorption amount /
- pore structure /
- soft and hard coal /
- coalbed gas
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[1] 孟召平,田永东,李国富.煤层气开发地质学理论与方法[M].北京:科学出版社,2010. [2] HOU Quanlin, LI Huijun, FAN Junjia, et al. Structure and coalbed methane occurrence in tectonically deformed coals[J]. Science China(Earth Sciences), 2012 (11): 1755-1763. [3] 郝富昌,抄隆霄,孙丽娟,等.软硬煤瓦斯解吸规律及影响因素的实验研究[J].中国安全生产科学技术,2017,13(3):42-46. [4] 孙丽娟.不同煤阶软硬煤的吸附-解吸规律及应用[D].北京:中国矿业大学(北京),2013. [5] 刘彦伟,刘明举.粒度对软硬煤粒瓦斯解吸扩散差异性的影响[J].煤炭学报,2015,40(3):579-587. [6] 姚有利,秦跃平,于海春.煤中瓦斯解吸渗透理论及实验研究[J].辽宁工程技术大学学报(自然科学版),2009,28(5):701-703. [7] 曹垚林,仇海生.碎屑状煤芯瓦斯解吸规律研究[J].中国矿业,2007,16(12):119-123. [8] 魏建平,陈永超,温志辉.构造煤瓦斯解吸规律研究[J].煤矿安全,2008,39(8):1-3. [9] 张小东,刘浩,刘炎昊,等.煤体结构差异的吸附响应及其控制机理[J].地球科学(中国地质大学学报),2009,34(5):848-854. [10] 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. [11] 聂百胜,柳先锋,郭建华,等.水分对煤体瓦斯解吸扩散的影响[J].中国矿业大学学报,2015,44(5):781. [12] 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. [13] 李云波,张玉贵,张子敏,等.构造煤瓦斯解吸初期特征实验研究[J].煤炭学报,2013,38(1):15-20. [14] 富向,王魁军,杨天鸿.构造煤的瓦斯放散特征[J].煤炭学报,2008,33(7):775-779. [15] 张子敏,张玉贵.大平煤矿特大型煤与瓦斯突出瓦斯地质分析[J].煤炭学报,2005,30(2):137-140. [16] B. B. 霍多特.煤与瓦斯突出[M].宋士钊,王佑安,译.北京:中国工业出版社,1966. [17] 李晓泉,尹光志.不同性质煤的微观特性及渗透特性对比试验研究[J].岩石力学与工程学报,2011,30(3):500-508.
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