煤层群联合抽采瓦斯混源比例的对比试验  

Comparison test of the proportion of coal seam group combined extraction gas mixed source

作　　者：丁红 吴教锟[1,2] 冯仁俊 位乐[1,2] DING Hong;WU Jiaokun;FENG Renjun;WEI Le(State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China;CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《矿业安全与环保》2021年第3期33-38,共6页Mining Safety & Environmental Protection

基　　金：“十三五”国家科技重大专项(2016ZX05067-004-004);重庆市自然科学基金面上项目(cstc2020jcyj-msxmX1013);天地科技股份有限公司科技创新创业资金专项(2019-TD-QN032)。

摘　　要：针对煤层群联合抽采时各煤层瓦斯无法准确计量的难题,根据瓦斯组分中的CH 4体积分数和碳同位素分布规律,基于化学组成质量守恒定律,建立煤层群联合抽采瓦斯气体混源比例计算模型,并在小屯煤矿开展对比试验。研究结果表明:小屯煤矿各煤层瓦斯中CH 4体积分数由大到小排序为6下煤层>6中煤层>6上煤层,CH 4碳同位素值分布在-3.6%~-3.2%内,由重到轻排序为6下煤层>6中煤层>6上煤层。联合抽采6上煤层+6中煤层+6下煤层时,基于碳同位素原理计算得到的6上煤层混合比例为10.82%~24.54%,6中煤层混合比例为57.81%~69.58%,6下煤层混合比例为5.88%~31.37%,与分层计量考察结果基本一致。说明基于碳同位素进行煤层群联合抽采瓦斯混源比例的计算是科学准确的,研究结果可为煤层群瓦斯联合抽采达标评判提供新的研究思路。In view of the problem that the gas in each coal seam group cannot be accurately measured when the coal seam group was combined drainage,according to the distribution law of CH 4 volume fraction of gas component and carbon isotope,and based on the law of conservation of chemical composition mass,the calculation model of mixed source ratio of coal seam group combined gas extraction was established,the comparative tests were carried out in Xiaotun Coal Mine.The results show that the CH 4 volume fraction of each coal seam gas is sorted from large to small with 6 D,6 M and 6 U,the CH 4 carbon isotope value of the gas is distributed between-3.6%and-3.2%,and the carbon isotope value of each coal seam gas is sorted from heavy to light with 6 D,6 M and 6 U.The ratio of coal seam mixture was calculated on the basis of carbon isotope principle when the 6 U,6 M and 6 D coal seam were combined extraction,the ratio of 6 U coal seam mixing was between 10.82%and 24.54%,the ratio of 6 M coal seam mixing was between 57.81%and 69.58%,and the ratio of the 6 D coal seam mixing was between 5.88%and 31.37%,which was basically consistent with the results of stratified measurement investigation.It shows that the calculation of the proportion of gas combined extraction of coal seam group and gas mixed source based on carbon isotope is scientific and accurate,and the results provide new research ideas for the evaluation standards of gas combined extraction of coal seam group.

关 键 词：煤层群 瓦斯抽采 碳同位素 分层计量 组分含量 

分 类 号：TD712.6[矿业工程—矿井通风与安全]