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为研究不同温度条件下型煤对CH4/CO2混合气的吸附规律,利用自行研制具有温度调控功能的吸附实验装置,对型煤试件(φ50 mm×100 mm)进行不同浓度CH4/CO2混合气的非等温吸附实验。研究结果表明:在同一温度下,混合气中CO2浓度越大吸附量越大,CO2的吸附能力大于CH4,混合气吸附曲线介于煤对纯CH4和CO2两者之间,型煤对于混合气的吸附量明显小于相同条件的煤粉试样。不同温度下,同一实验压力吸附量出现了先升高后降低的趋势,在40℃时出现最大值;吸附平衡时,游离相中CO2的相对浓度普遍降低,在40℃时下降幅度最大。因此注入CO2可以有效置换煤层CH4,在40℃时CO2相对浓度越高,驱替效果越明显。
In order to study the adsorption of CH4 / CO2 mixture on briquette under different temperature conditions, a self-developed adsorption experiment device with temperature control was used to test the briquette samples (φ50 mm × 100 mm) with different concentrations of CH4 / CO2 Non-isothermal adsorption experiment. The results show that: at the same temperature, the greater the CO2 concentration in the mixture, the larger the adsorption capacity, the greater the adsorption capacity of CO2 is. The adsorption curve of the mixture is between coal and pure CH4 and CO2. Of the adsorption capacity was significantly less than the same conditions of coal samples. At different temperatures, the adsorption pressure of the same experimental sample increased firstly and then decreased, and reached the maximum at 40 ℃. The relative concentration of CO2 in the free phase was generally decreased at 40 ℃, and the maximum decrease was observed at 40 ℃. Therefore, the injection of CO2 can effectively displace coal seam CH4. The higher the relative concentration of CO2 at 40 ℃, the more obvious the displacement effect.