Study on the effect of hydrogen sulfide on methane adsorption of different coal ranks
To explore the effect of H2 S on the CH4 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 H2 S on the pores of different coal ranks and the adsorption characteristics of H2 S in coal,and analyzed the trend of CH4 adsorption isothermal curves of different coal ranks with H2S.By comparing the corresponding CH4 saturation adsorption number,the effect of H2 S mass fractions of different coal ranks on CH4 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 H2S in the coal body,the surface and pores of coal provide adsorption sites for H2 S,and H2 S has a more obvious effect on the porosity of meager coal.Under the same temperature and pressure,the adsorption heat value of H2S is about 1.5 times that of CH4 in the same coal body,and the adsorption capacity of coal bodies for H2 S is larger than that of CH4 in the adsorption of two-component gases(CH4 and H2S).Within the range of 0-1.5％of H2 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 H2 S adsorption capacity has a more significant effect on the CH4 adsorption capacity of the meager coal,followed by fat coal and lean coal.
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