摘要
以沁水盆地等煤样品煤孔隙分析和等温吸附试验研究为基础,通过煤吸附气体动力学过程和吸附理 论模型分析,从物理化学层面对煤吸附气体的固气作用机理进行了深入探讨。认为:煤吸附气体动力学过程包括 渗流阶段、表面扩散阶段、体扩散阶段和吸着阶段;煤—煤层气吸附体系的吸附力和吸附能决定了不同煤级煤对不 同气体吸附量的大小;扩散对煤吸附气体的动力学过程有重要控制作用;煤—甲烷吸附体系应存在多元化的吸附 模型,当压力8～10MPa以上时,Langmuir单分子层吸附模型的适应性受到限制,凝聚—吸附孔隙发育和气体凝聚 是制约Langmuir单分子层吸附模型的主要原因。
On the basis of the pore analysis and isothermal adsorption experimental investigation of the coal samples collected from Qinshui Basin and so on, the solid-gas interaction mechanism of coal-adsorbed gas was thoroughly studied in the view of physical chemistry through analyzing the dynamic process and adsorption theoretical model of coal-adsorbed gas. It was thought that the dynamic process of coal-adsorbed gas may be divided into four stages, i.e. seepage flow, surface diffusion, bulk diffusion and sorption stages; the gas volume adsorbed by the coals with different ranks is dependent on the adsorption force and energy of coal-coalbed methane system; the dynamic process of coal-aborbed gas is greatly controlled by diffusion; and the coal-methane adsorption system should have various adsorption models and, when formation pressure is over 8-10 MPa, the adaptability of Langmuir monomolecule layer adsorption model will be limited, in which the developed coagulation-adsorption pores and gas coagulation are the principal reasons of constraining the Langmuir model.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2005年第1期16-18,21,共4页
Natural Gas Industry
基金
"973"国家重点基础研究发展规划项目"中国煤层气成藏机制及经济开采基础研究"(2002CB11700)资助~~
