Experimental research on coal adsorption of CH4 and CO2 mixed gas

Experimental research on coal adsorption of CH4 and CO2 mixed gas

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In order to reveal the competitive adsorption characteristics of CH4 /CO2 mixed gas in coal, the isothermal adsorption experiments of five different ratios of CH4 /CO2 mixed gas in coal were carried out.Experiments show that the relationship between gymnastics wall decals the adsorption amount of pure CH4 and pure CO2 and the gas pressure satisfies the Langmuir equation.Under the same conditions, the adsorption capacity of CO2 by coal is twice that of CH4; the adsorption capacity of mixed gas of CH4 /CO2 with different ratios is always between the single-component CH4 and CO2; coal does not adsorb mixed gas independently, but competitively, and CO2 is dominant in the process of competitively adsorption; as the volume fraction of CO2 in the mixed gas increases, the adsorption selectivity coefficient increases, and it is always greater than 1, indicating that CO2 injection is feasible to displace CH4, that is, CO2-ECBM/CO2 storage is feasible; the BET multi-component gas adsorption model vegas golden knights background is more suitable for predicting the amount of CH4 /CO2 mixed gas adsorbed by coal.