河北开滦矿区晚古生代煤对CH_4/CO_2二元气体等温解吸特性  

Isothermal Desorption Chracteristics of CH_4/CO_2 Mixed Gas for the Late Paleozoic Coals from the Kailuan Coalfield of Hebei Province

作　　者：张贝贝[1] 代世峰[2,1] 雒洋冰[1] 宋宪存[1] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《地质论评》2010年第5期753-760,共8页Geological Review

基　　金：欧盟第六框架的计划课题;国家973课题(编号2006CB202201)资助的成果

摘　　要：研究了河北开滦矿区不同变质程度的煤对不同配比CH4/CO2二元气体等温解吸特性,并用扩展Langmuir方程的推论计算了CH4/CO2二元气体各组分在吸附相中的浓度,分析了其变化特征。结果表明:在开滦矿区煤对CH4/CO2二元气体解吸过程中,中等变质程度煤(Ro=1.21%)对混合气体的吸附能力大于低变质程度煤(Ro=0.58%),且混合气体中CO2浓度越大,总吸附量越多。吸附相中CH4的相对浓度是逐渐降低的,CO2的相对浓度是逐渐升高的。开滦矿区中等变质程度煤相对于低变质程度煤,用CO2气体置换煤层中CH4,可以获得较高的单位压降CH4解吸率,注入CO2的量越多、相对浓度越高,其置换效果就越好,更适于往煤层注入CO2提高煤层气产量技术的实施。This paper describes the isothermal desorption chracteristics of mixed CH4/CO2 gas for the Late Paleozoic Coals with different ranks from the Kailuan Coalfield,Hebei Province. The abundance and variation of each gas in adsorption phases were analyzed using the extended-Langmuir equation. The results of isothermal desorption experiments show that the medium-rank coal （Ro= 1.21 %） has a stronger adsorption ability of the mixing gas than the low-rank coal （Ro= 0.58%）. The quantity of the adsorbed mixed gas by the coal increases with the increasing of the CO2 quality in the mixed gas. The relative abundance of CH4 in adsorbed phase decreases and that of CO2 increases gradually with desorption. As compared to the low-rank coal,the medium-rank has a higher unit desorption rate for CH4. The replacement of CH4 with CO2 will be more efficient when more quantity and higher relative abundance of CO2 is injected. The medium-rank coal is more subjected to be used for CO2 Sequestration and Enhanced Coalbed Methane technique than the low-rank.

关 键 词：开滦矿区 等温解吸实验 二元气体 吸附相 解吸率 

分 类 号：P618.11[天文地球—矿床学]