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基于吸附动力学理论分析水分对煤体吸附特性的影响 被引量:19

Effects of liquid water on coalbed methane adsorption characteristics based on the adsorption kinetic theory
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摘要 为了研究块裂煤体在不同储水状态下的吸附特性差异,选用潞安余吾煤矿的贫煤和阳煤开元煤矿的无烟煤并加工成Φ100 mm×150 mm的大块圆柱体煤样,保留了煤体原有的裂隙,基于吸附动力学理论,采用自主研制的吸附-注水成套实验系统,针对两煤种设计了6种不同含水率下的瓦斯吸附特性实验,并对同等初始条件下的定容吸附速率进行了研究。结果表明:水分作用下,对于相同初始压力下的定容吸附,1号和2号煤样干燥时的吸附速率分别是饱和含水时的16倍和22倍,吸附量分别是饱和含水时的5倍和32倍,通过孔隙测定结果,证实1号煤样具有更为发育的孔隙裂隙通道;关于终态吸附量随含水率的增加而降低的趋势,1号煤样是非线性的,但2号煤样呈现较好的线性衰减。 For the purpose of various adsorption characteristics with different moisture contents of fracture coal sam- ples, meagre coal sample from Lu' an Coal Mine and anthracite coal sample from Yangmei Kaiyuan Coal Mine were a- dopted and a composed of experimental system for constant volume adsorption was designed. The dimension of sample was Ф100mm×150mm and contained the original fissures and fractures of it. The experimental system of adsorption- water-injection which manufactured by own was adopted, and a series of six different moisture contents coal samples experiments were designed. The condition was at the same initial gas pressure and the adsorption room was constant. The results show that: In the constant volume adsorption, for the affection of fluid water at the same initial pressure, the adsorption velocities of No. 1 and No. 2 coal sample in drying state are 16 and 22 times of approximate saturation mois- ture content state(ASMCS) separately,the adsorption volumes of No. 1 and No. 2 coal sample are 5 and 32 times of ASMCS separately, due to less porous of No. 2. The adsorption volume at final state,which is declined as a function of moisture contents, the law of No. 2 coal sample is linear decrease but No. 1 is nonlinear.
出处 《煤炭学报》 EI CAS CSCD 北大核心 2014年第3期518-523,共6页 Journal of China Coal Society
基金 国家自然科学基金资助项目(51304142 21373146) 山西省基础研究计划资助项目(2013021029-3)
关键词 块裂煤体 吸附特征 水分 吸附动力学理论 煤层气开采 fracture coal sample adsorption characteristics liquid water adsorption kinetic theoretical coalbed meth- ane exploitation
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