低渗煤中氮气与二氧化碳气体吸附的表征模型

Characterization Model of N_(2) and CO_(2) Gas Adsorption in Low Permeability Coal

地质领域常以等温吸附试验为研究方法,探究煤中气体之间的吸附行为。以刘庄矿13煤为研究对象,开展了N_(2)、CO_(2)气体吸附实验,在综合分析拟合回归系数平方R^(2)、模型计算值与实验值的残差平方和v与相对误差s的基础上,选出低渗煤中气体吸附的最佳吸附模型。结果表明:对于低渗煤中N_(2)吸附的模型拟合精度由高到低为:优化L模型>优化D-A模型>优化D-R模型>D-A模型>L模型>D-R模型>F模型;对于低渗煤中CO_(2)吸附的模型拟合精度由高到低为:优化L模型>优化D-A模型=优化D-R模型>D-A模型>L模型>D-R模型>F模型。实验结果可作为低渗煤层中气体吸附及CO_(2)封存提供地质依据。

Isothermal adsorption experiments are widely used in the field of geology as a research method to investigate the adsorption behavior between gases in coal seams.Taking the coal reservoirs of No.13 Coal from Liuzhuang Mine as the research object,N_(2) and CO_(2) gas adsorption experiments were carried,and the optimal adsorption model for gas adsorption in low permeability coal was selected on the basis of a comprehensive analysis of the squared regression coefficients of the fit R^(2),the residual sum of squares of the calculated and experimental values of the model v,and the relative errors s.The results show that the models fitting degree of N_(2) adsorption in low permeability coal from high to low:optimized L model>optimized D-A model>optimized D-R model>D-A model>L model>D-R model>F model.The models fitting degree of CO_(2) adsorption in low permeability coal from high to low:optimized L model>optimized D-A model=optimized D-R model>D-A model>L model>D-R model>F model.The experimental results can provide geological basis for gas adsorption and CO_(2) sequestration in low-permeability coal seams.