液态CO_(2)溶浸作用对煤吸附特征的影响  

Influence of liquid CO_(2) soaking on adsorption characteristics of coal

作　　者：文虎[1,2] 郝健池 马砺 任立峰[1,2] 魏高明 郑学召[1,2] WEN Hu;HAO Jianchi;MA Li;REN Lifeng;WEI Gaoming;ZHENG Xuezhao(Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi’an University of Science and Technology,Xi’an 710054,China;College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安科技大学西部矿井开采及灾害防治教育部重点实验室,陕西西安710054 [2]西安科技大学安全科学与工程学院,陕西西安710054

出　　处：《西安科技大学学报》2022年第3期397-404,共8页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金项目(51974240,51804245,51904138,51904234);国家重点研发计划重点专项项目(2016YFC0801802,2018YFC0808201)。

摘　　要：将液态CO_(2)注入煤层既可以达到驱替煤层CH_(4)的目的,又可以有效地对CO_(2)进行封存,对煤矿瓦斯灾害防治和实现CO_(2)封存及减排具有的重要意义。为研究液态CO_(2)溶浸作用对煤吸附特征的影响,指导和完善液态CO_(2)利用一封存一体化技术及机理,采用压汞实验结合CO_(2)等温吸附实验,对煤岩经液态CO_(2)“溶浸”作用引起的孔隙变化和CO_(2)气体的吸附特征变化进行了探讨。结果表明:溶浸前后煤样的孔隙变化是造成煤样对CO_(2)气体吸附存在差异性的主要原因,其中<100 nm孔径非闭合孔隙在这个过程中起到了主导作用,溶浸后煤样对CO_(2)的吸附量小于原始煤样,且对温度的敏感程度要弱于原始煤样。从热力学角度分析得出,吸附过程中,原始煤样的吸附热及吸附势始终比溶浸煤样大,且原始煤样比溶浸煤样具有更大的吸附空间;解吸过程中,溶浸煤样的吸附热及吸附势稍大于原始煤样,但两者的吸附空间差异不大。The injection of liquid CO_(2)into coal seam can displace coal seam CH_(4),and store CO_(2)effectively,which is of great significance for coal mine gas disaster prevention and CO_(2)storage and emission reduction.In order to study the influence of liquid CO_(2)soaking on the adsorption characteristics of coal and to promote the integrated technology and mechanism of liquid CO_(2)utilization-storage,the pore changes and CO_(2)gas adsorption characteristics of coal and rock caused by liquid CO_(2)“leaching”were examined by mercury injection experiment and CO_(2)isothermal adsorption experiment.The results indicate that the pore change of coal samples before and after solution leaching is the main reason for the difference of CO_(2)adsorption of coal samples,the unclosed pores with a pore diameter less than 100 nm play a leading role in this process,the CO_(2)adsorption capacity of the leached coal sample is less than that of the original coal sample,and the sensitivity to temperature is weaker than that of the original coal sample.From the perspective of thermodynamics,it is concluded that in the adsorption process,the adsorption heat and adsorption potential of the original coal sample tend to be greater than that of the solution coal sample,and the adsorption space in the original coal sample is larger than that in the solution coal sample.In the desorption process,the adsorption heat and adsorption potential of the solution leached coal sample are slightly larger than that of the original coal sample,but there is little difference in the adsorption space between the solution leached coal sample and the original coal sample.

关 键 词：CO_(2)封存 吸附解吸 吸附势 吸附热 

分 类 号：TD712[矿业工程—矿井通风与安全]