硫化氢对不同煤级煤甲烷吸附影响效应研究  

Study on the effect of hydrogen sulfide on methane adsorption of different coal ranks

作　　者：李金雨 纪和 李懿欣 单亚飞[1] 白刚[1] 周西华[1] 袁昕 武文杰 LI Jinyu;JI He;LI Yixin;SHAN Yafei;BAI Gang;ZHOU Xihua;YUAN Xin;WU Wenjie(College of Safety Science and Engineering,Liaoning Technical University,Huludao 125105,Liaoning,China;Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education,Liaoning Technical University,Huludao 125105,Liaoning,China;School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]辽宁工程技术大学安全科学与工程学院,辽宁葫芦岛125105 [2]辽宁工程技术大学矿山热动力灾害与防治教育部重点实验室,辽宁葫芦岛125105 [3]中国矿业大学(北京)能源与矿业学院,北京100083

出　　处：《安全与环境学报》2024年第5期1816-1824,共9页Journal of Safety and Environment

基　　金：国家自然科学基金项目(52304086,52274204,52104195);中国科协青年人才托举工程(2022QNRC001)。

摘　　要：为探究H_(2)S在不同煤级煤体中对CH_(4)吸附特性的影响效应,利用分子模拟构建肥煤、瘦煤及贫煤3种不同煤级的复杂煤大分子结构模型,并探究H_(2)S对煤体孔隙的影响作用以及H_(2)S在煤中的吸附特性,分析不同煤级煤体中H_(2)S对CH_(4)饱和吸附量的影响作用。结果显示:煤体表面积与孔隙体积与煤变质程度有关,由大到小依次为肥煤、瘦煤、贫煤;在煤体吸附H_(2)S过程中,煤体表面及孔隙为H_(2)S提供吸附场所,且H_(2)S对贫煤孔隙率影响较为明显;在同温同压条件下,H_(2)S在同一煤体中的吸附热约为CH_(4)的1.5倍,在对CH_(4)及H_(2)S的双组分气体吸附中,煤体对H_(2)S的吸附能力大于CH_(4);煤体H_(2)S质量分数在0~1.5%变化区间内,贫煤的Langmuir吸附常数a降幅高达77.4%,肥煤及瘦煤分别为31.1%及32.6%,表明H_(2)S质量分数的变化对贫煤的甲烷吸附能力影响更显著,肥煤及瘦煤次之。To explore the effect of H_(2)S on the CH_(4) adsorption characteristics in different coal ranks,this paper used molecular simulation technology to build three complex coal macromolecular structure models with different coal ranks(fat coal,lean coal,and meager coal)as the basic model,and explored the influence of H_(2)S on the pores of different coal ranks and the adsorption characteristics of H_(2)S in coal,and analyzed the trend of CH_(4) adsorption isothermal curves of different coal ranks with H_(2)S.By comparing the corresponding CH_(4) saturation adsorption number,the effect of H_(2)S mass fractions of different coal ranks on CH_(4) saturation adsorption was obtained.The results show that the surface area and pore volume of the coal body are related to the degree of coal metamorphism,and the order was fat coal,lean coal,and meager coal.During the adsorption of H_(2)S in the coal body,the surface and pores of coal provide adsorption sites for H_(2)S,and H_(2)S has a more obvious effect on the porosity of meager coal.Under the same temperature and pressure,the adsorption heat value of H_(2)S is about 1.5 times that of CH_(4) in the same coal body,and the adsorption capacity of coal bodies for H_(2)S is larger than that of CH_(4) in the adsorption of two-component gases(CH_(4) and H_(2)S).Within the range of 01.5%of H_(2)S adsorption capacity of coal,the Langmuir adsorption constant“a”decreases by 77.4%for meager coal,31.1%,and 32.6%for fat coal and lean coal,respectively,indicating that the change of H_(2)S adsorption capacity has a more significant effect on the CH_(4) adsorption capacity of the meager coal,followed by fat coal and lean coal.

关 键 词：安全工程 H2S 吸附特性 煤级 分子模拟 

分 类 号：X936[环境科学与工程—安全科学]