余吾矿构造煤吸附动力学特性

张哲; 秦兴林

余吾矿构造煤吸附动力学特性

张哲,
秦兴林

计量
- 文章访问数: 30
- HTML全文浏览量: 0
- PDF下载量: 0
出版历程
- 发布日期: 2020-08-19

Adsorption Dynamics Characteristic of Tectonic Coal in Yuwu Coal Mine

摘要

摘要: 针对构造煤瓦斯吸附动力学特性,以山西潞安余吾煤矿为工程背景,选取了4种不同破坏类型的构造煤样,进行了压汞测试和瓦斯等温吸附实验,获得了煤体孔隙分布特征和瓦斯吸附动力学曲线,并分析了吸附压力、吸附量及吸附速率随时间的变化规律。研究结果表明:吸附压力随吸附时长的增加而不断降低,在吸附开始的前20 min内压力急剧降低,降幅高达60%以上;随吸附时长的增加,各煤样瓦斯吸附量经历了先急剧增大再缓慢增加最后达到平衡的非线性变化过程;吸附速率曲线表明,随煤体破坏程度的增加,瓦斯吸附速率逐渐增大,吸附性增强。不同破坏类型构造煤孔隙分布差异显著,进而影响瓦斯吸附动力学特性,在煤矿瓦斯治理和煤层气开发中应予以考虑。
- 构造煤 /
- 破坏程度 /
- 瓦斯吸附 /
- 吸附动力学 /
- 孔隙分布
Abstract: Aiming at the methane adsorption dynamics characteristics of tectonic coals, Yuwu Coal Mine of Lu’an Group in Shanxi Province was chosen as the engineering background. Four tectonic coal samples with different degrees of destruction were selected for high-pressure mercury intrusion porosimetry and methane isothermal adsorption experiments, and the pore distribution characteristics in coal and methane adsorption dynamics curves were obtained. The changing laws of adsorption pressure, adsorption volume and adsorption speed with time were analyzed. The research result shows that the adsorption pressure is decreased with the increase of time. At the initial 20 min of the adsorption, pressure sharply declines with the decreasing amplitude, more than 60%. As the increase of adsorption time, the methane adsorption volume experiences a nonlinear changing process: dramatical increase-slow rise-reaching equilibrium. The adsorption speed curves indicate that both the methane adsorption speed and adsorption capacity are enhanced with the increase of the degree of destruction. The pore distribution characteristics of tectonic coals with different destruction types vary a lot, further affecting the methane adsorption dynamics, which should be considered in the engineering practice for coalmine gas control and methane exploitation.
- tectonic coal /
- degree of destruction /
- gas adsorption /
- adsorption dynamics /
- pore distribution

HTML全文

参考文献(24)

[1]	宋昱,姜波,李凤丽,等.低-中煤级构造煤纳米孔分形模型适用性及分形特征[J].地球科学,2018,43(5):1611-1622.
[2]	彭苏萍,魏文希,杜文凤,等.基于AVO反演与叠前同步反演预测构造煤分布[J].中国矿业大学学报,2018(5):1-6.
[3]	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.
[4]	Sharon M S, Maria D M, Mark A E, et al. Pore characteristics of Wilcox Group Coal, U. S. Gulf Coast Region: Implications for the occurrence of coalbed gas[J]. International Journal of Coal Geology, 2015, 139: 80-94.
[5]	邵强,王恩营,王红卫,等.构造煤分布规律对煤与瓦斯突出的控制[J].煤炭学报,2010,35(2):250-254.
[6]	秦修培,邹艳,汪吉林.构造变形对煤孔隙发育特征影响的研究[J].煤炭科学技术,2017,45(4):155-159.
[7]	薛明喜,陈开远.基于谱分解的构造煤地震识别方法研究[J].煤炭科学技术,2018,46(3):19-24.
[8]	琚宜文,姜波,王桂梁,等.构造煤结构及储层物性[M].徐州:中国矿业大学出版社, 2005.
[9]	Frodsham K, Gayer R A. The impact of tectonic deformation upon coal seams in the South Wales coalfield, UK[J]. International Journal of Coal Geology, 1999, 38(3): 297-332.
[10]	李明,姜波,刘杰刚,等.黔西土城向斜构造煤发育模式及构造控制[J].煤炭学报,2018,43(6):1565.
[11]	张浪.寺家庄煤与瓦斯突出机制分析[J].煤炭工程,2018(7):84-86.
[12]	张庆浩,贾天让,李松林,等.含水率对构造煤煤粒瓦斯扩散的影响研究[J].中国安全生产科学技术,2018(8):117-122.
[13]	徐德宇.构造变形对煤与瓦斯突出的控制作用研究[D].北京:中国矿业大学(北京),2018.
[14]	于军.不同软硬煤的结构差异性研究[J].煤矿安全,2017,48(12):5-8.
[15]	柳先锋,宋大钊,何学秋,等.微结构对软硬煤瓦斯吸附特性的影响[J].中国矿业大学学报,2018,47(1):155-161.
[16]	王向浩,王延斌,高莎莎,等.构造煤与原生结构煤的孔隙结构及吸附性差异[J].高校地质学报,2012,18(3):528-532.
[17]	曲闯,左宇军,于迪,等.王庄煤矿不同破坏类型煤体结构差异性及其对瓦斯吸附性能的研究[J].煤矿开采,2017,22(6):88-91.
[18]	徐刚,金洪伟,李树刚,等.不同坚固性系数f值煤渗透率分布特征及其井下水力压裂适用性分析[J].西安科技大学学报,2019,39(3):443-451.
[19]	路冠文,汪吉林,张娅婷,等.西南地区构造煤吸附解吸特性研究[J].煤矿安全,2016,47(2):9-13.
[20]	容婷,李会军,侯泉林,等.不同变形机制对无烟煤化学结构的影响[J].中国科学:地球科学,2015,45(1):34-42.
[21]	姜波,秦勇,琚宜文,等.构造煤化学结构演化与瓦斯特性耦合机理[J].地学前缘,2009,16(2):262-271.
[22]	张辉,马东民,刘厚宁.大佛寺和胡家河4#煤润湿性对比[J].西安科技大学学报,2019,39(3):435-442.
[23]	贺亚维,张荣军,郭永宏.延川地区储层特征及综合评价[J].西安科技大学学报,2019,39(5):811-818.
[24]	于波.鄂尔多斯盆地上古生界致密砂岩储层微观孔隙特征[J].西安科技大学学报,2018,38(1):150.