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Abstract To study the adsorption law of CH4/CO2 mixture on briquette specimen under different temperatures，conduct the non-isothermal adsorption experiments for different concentrations of CH4/CO2 mixture of briquette specimen(? 50 mm × 100 mm) by using self-developed gas mixture adsorption test device controlling temperature are conducted. The results reveal that：at the same temperature，the more CO2 concentration in the mixture，the stronger gas adsorption capacity；the adsorption capacity of CO2 is greater than that of CH4；the adsorption curve of mixture gas is between that of pure CH4 and CO2，the mixture gas adsorption quantity of block coal briquette is less than that of coal powder sample obviously. Under conditions of different temperatures and same pressure，the adsorption quantity increases firstly and decreases subsequently，the maximum value occurred when the temperature reached to 40 ℃. When the adsorption reached the balance，the relative concentration of CO2 in free phase decreases generally，and the decrease amplitude is the maximum at 40 ℃. So，injecting CO2 could replace CH4 in coal seams effectively，and at 40 ℃，the more relative concentration of CO2，the more obvious the displacement effect will be.
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Received: 20 November 2012
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2013, Vol. 32 
