负压动态调控下矿井瓦斯抽采工况参数变化对比与分析  

Comparison and analysis of gas extraction working condition parameters under dynamic control of negative pressure

作　　者：陈勇 CHEN Yong(CCTEG Chongqing Research Institute,Chongqing 400037,China;School of Resource&Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]中煤科工集团重庆研究院有限公司,重庆400037 [2]湖南科技大学资源环境与安全工程学院,湖南湘潭411201

出　　处：《矿业安全与环保》2020年第5期108-112,共5页Mining Safety & Environmental Protection

基　　金：中国煤炭科工集团科技创新创业资金专项项目(2019-TD-QN035,2019-TD-QN032);重庆市自然科学基金面上项目(cstc2020jcyj-msxmX1013);重庆市安全生产(煤炭发展)专项资金项目(2020B182[5985]20015506,2020B182[5985]20015511);企业自立创新引导项目(2019YBXM25)。

摘　　要：为研究矿井瓦斯抽采负压动态调控机理及动态调控作用下矿井瓦斯抽采工况参数变化情况,以底板岩层钻孔、采空区为研究对象,开展了不同抽采状态负压调控前后瓦斯抽采负压与抽采瓦斯浓度、抽采量、输送管道内气体流速对应关系的现场试验。试验结果表明:瓦斯抽采系统从混源瓦斯抽采到同源瓦斯抽采,孔口负压从1.20 kPa提高到11.14 kPa,增大了8.28倍;钻场抽采负压从3.02 kPa提高到43.00 kPa,增大了13.24倍。当抽采负压提高至有富余能力将部分空气抽入瓦斯抽采系统时,底板岩层钻孔出现抽采负压增大、抽采瓦斯浓度降低的现象,钻场抽采瓦斯浓度由46%下降到36%;抽采瓦斯浓度虽有一定降低,但平均抽采混合量由试验前的0.82 m^3/min增大到2.72 m^3/min,增大了2.32倍;平均抽采瓦斯纯量由试验前的0.31 m^3/min增大到0.98 m^3/min,增大了2.16倍;管道内气体流速由1.82 m/s增大到6.01 m/s,增大了2.30倍。可为矿井瓦斯抽采负压动态调控及合理抽采负压的选取提供一定的理论依据。In order to study the dynamic control mechanism of gas extraction negative pressure,as well as the variation of gas extraction working condition parameters under dynamic control,taking goaf and borehole in floor rock strata as the research objects,field tests were carried out on the relationship between the negative pressure state of gas extraction and several factors including gas extraction concentration,gas extraction volume,and gas velocity in the pipeline before and after the negative pressure control of different extraction states.The results show that when the gas extraction system shifts from mixed source gas extraction to homogeneous gas extraction,the orifice negative pressure increases from 1.20 kPa to 11.14 kPa,increasing by 8.28 times;the negative pressure of drilling field increases from^3.02 kPa to 43.00 kPa,increasing by 13.24 times.When the negative pressure increases to have sufficient capacity to draw air into gas extraction system,the negative pressure increases and the extraction concentration decreases during drilling in floor rock strata,and the gas concentration in drilling field decreases from 46%to 36%;although extraction concentration has been reduced,the average extraction mixing increases from 0.82 m^3/min to 2.72 m^3/min,increasing by 2.32 times;the amount of pure extraction increases from 0.31 m^3/min to 0.98 m^3/min,increasing by 2.16 times;the average extraction purity increases from 0.31 m^3/min before the test to 0.98 m^3/min,increasing by 2.16 times;the gas velocity in the pipeline increases from 1.82 m/s to 6.01m/s,increasing by 2.30 times.It can provide some theoretical basis for dynamic control of negative pressure of gas extraction and selection of reasonable extraction negative pressure.

关 键 词：瓦斯抽采 负压 动态调控 瓦斯浓度 瓦斯流量 管道内气体流速 

分 类 号：TD712.6[矿业工程—矿井通风与安全]