残留煤层封存CO_2试验研究

Experimental Study on Carbon Dioxide Storage in Residual Coal

为了研究气体压力和温度变化对残留煤层封存CO_2的影响规律,利用自制的吸附试验装置,开展气体压力和温度影响的CO_2吸附试验。试验结果表明:在相同温度条件下,随着气体压力升高,CO_2吸附量增大,而增长梯度逐渐减小,其变化规律符合Langmuir方程;在相同压力条件下,CO_2的吸附量随着试验温度升高而减少,变化梯度逐渐减小;利用Langmuir方程对试验数据进行拟合,拟合结果与实际结果之间误差不超过5%。试验所得结论为残留煤层永久封存CO_2提供理论依据。

For the study of CO2 storage rules in residual coal with gas pressure and temperature variation, using self developed adsorption devices, the experiments of adsorption were carried considering the effect of temperature and pressure. The results show that： at the same temperature, the adsorption increases with the pressure rising, the gradient decreasing, and the rules are consistent with Langmuir equation, at the same pressure, the adsorption declines with the temperature increasing, the gradient dropping gradually; the data fitted with Langmuir equation, the error of calculating results compared with experimental results is less than 5%. The conclusion provides a basis for CO2 storage permanently in residual coalbed.