煤层储存CO_(2)能力的地应力响应特征  

In-situ stress response characteristics of CO_(2) storage capacity in coal seam

作　　者：赵中玲 ZHAO Zhongling(Jinneng Holding Coal Industry Group Yangquan Co.,Ltd.,Yangquan 045000,China)

机构地区：[1]晋能控股煤业集团阳泉有限公司,山西阳泉045000

出　　处：《煤矿安全》2021年第8期28-32,38,共6页Safety in Coal Mines

摘　　要：准确估算煤层中CO_(2)的吸附量对CO_(2)封存技术具有重要意义,特别是煤层埋深对CO_(2)吸附能力的影响;通过设计开发加载煤体吸附实验系统,测试了5种煤样在不同加载条件下的吸附等温线;研究结果表明:煤体在加载/卸载后将存在残余应力,且残余应力随加载力的增大而增大;随着煤体加载应力的增大,孔隙率呈幂指数减小,而CO_(2)吸附量呈线性减小,即地应力增大1 MPa(埋深大约增加40 m),煤体对CO_(2)的吸附能力大约降低0.43%最大吸附量。Accurate estimation of CO_(2) adsorption capacity in coal seam is a great significance to CO_(2) storage technology, especially the influence of coal seam depth on CO_(2) adsorption capacity. Through the design and development of loading coal adsorption experimental system, the adsorption isotherms of five kinds of coal samples under different loading conditions were tested. The results show that there will be residual stress in coal after loading/unloading, and the residual stress increases with the increase of loading force. With the increase of loading stress, the porosity decreases exponentially, while the CO_(2) adsorption capacity decreases linearly. That is to say, the in-situ stress increases by 1 MPa(the buried depth increases by about 40 m), and the CO_(2) adsorption capacity in coal decreases by about 0.43% of the maximum adsorption capacity.

关 键 词：CO_(2)存储 吸附等温线 地应力 残余应力 孔隙率 最大吸附量 

分 类 号：TD712[矿业工程—矿井通风与安全]