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关于煤对不同气体(CH_4和CO_2)的吸附特性,经研究已查明:(1)不同变质程度的煤(挥发分为4.2～31.7％)在各种气体压力(1～40大气压)下,对CO_2的吸附能力总是大于对CH_4的吸附能力。随着煤变质程度增加(挥发分下降),吸附能力逐渐增大,当挥发分V~Γ=20～25％时,曲线斜率出现变化;此后,变质程度越高,吸附能力增加越快。同时,在同一平衡饱和压力下,CO_2和CH_4吸附能力的比随V~Γ的增加而增加,虽然随着压力增加,它们比值的变化从P=1大气压时的3～4到P=40大气压时的1.5～2.7。CO_2在煤中的吸附(解析)作用总是比瓦斯在煤中的吸附作用强烈得多。
With regard to the adsorption characteristics of coal to different gases (CH 4 and CO 2), the study has identified that: (1) coal with different metamorphic degrees (4.2-31.7% of volatilization) is under various gas pressures (1 to 40 atm) The adsorption capacity of CO_2 is always greater than the adsorption capacity of CH_4. As coal metamorphism increased (volatile content decreased), the adsorption capacity gradually increased. When the volatility V ~ Γ = 20 ~ 25%, the slope of the curve changed; the higher the degree of metamorphism, the faster the adsorption capacity increased. At the same time, the adsorption capacity of CO_2 and CH_4 increased with the increase of V ~ Γ at the same equilibrium pressure, although the ratio changed from 3 ~ 4 at P = 1 to P = 40 atm as the pressure increased When 1.5 ~ 2.7. Adsorption (resolution) of CO 2 in coal is always much stronger than that of coal gas.