煤矿安全2024，Vol.55Issue(6)：1-7,7.DOI:10.13347/j.cnki.mkaq.20230070
不同含水率与盐度对煤吸附CH4的影响
Effect of different moisture content and salinity conditions on CH4 adsorption by coal
摘要
Abstract
Coal reservoirs are often connected to hydrogeological systems through faults,allowing groundwater with mineralization to intrude into coal seams.In order to improve gas extraction,it is necessary to explore the effect of coal with different moisture con-tent and salinity conditions on CH4 adsorption.By means of various experimental tests,such as XPS,FTIR,we constructed macro-molecular structure models of Dongqu 8#coal with different moisture content and salinity conditions,conducted isothermal adsorp-tion simulation experiments,and analyzed in detail the effects of coal models with different moisture content and salinity conditions on the adsorption capacity of CH4.The results showed that the adsorption capacity of CH4 decreased with the increase of moisture content and salinity in coal;the effect of moisture content on CH4 adsorption was greater than that of salinity on CH4 adsorption;the ability of sodium salt to affect the adsorption of CH4 by coal was ranked from largest to smallest as follows:Na2CO3>NaHCO3>NaCl;electrostatic potential distribution:|Na2CO3 electrostatic potential|>|NaHCO3 of electrostatic potential|>|NaCl of the elec-trostatic potential|,it can be seen that the electrostatic force affects the strength of adsorption,the greater the value of the electrostat-ic potential of the ions in the salt,the stronger ability the coal to adsorb CH4.关键词
瓦斯抽采/甲烷/吸附作用/分子模拟/含水率/盐度Key words
gas extraction/CH4/adsorption action/molecular simulation/moisture content/salinity分类
矿业与冶金引用本文复制引用
田书彰,相建华,相兴华,邓小鹏..不同含水率与盐度对煤吸附CH4的影响[J].煤矿安全,2024,55(6):1-7,7.基金项目
国家自然科学基金资助项目(41572144,41102092) （41572144,41102092）
山西省应用基础研究计划资助项目(201601D021137) （201601D021137）
山西省高校教学改革创新资助项目(J20221260) （J20221260）
