突出孔洞构造煤与原生结构煤瓦斯吸附特性对比研究

Comparative study on gas adsorption characteristics between outburst hole tectonic coal and primary structural coal

为研究突出孔洞构造煤与原生结构煤孔隙特征对瓦斯吸附特性的影响,以三甲煤矿突出孔洞构造煤和原生结构煤为研究对象,运用压汞和液氮吸附实验相结合的方法对不同结构煤体孔隙结构进行研究;结合Menger几何模型分析不同结构煤体孔隙分形特征,进一步阐述孔隙结构分形特征对瓦斯吸附特征的影响。结果表明:原生结构煤与突出孔洞构造煤均存在滞后环,且突出孔洞构造煤的滞后环明显大于原生结构煤的滞后环;突出孔洞构造煤分形维数大于原生结构煤,突出孔洞构造煤孔隙复杂程度比原生结构煤高,突出孔洞构造煤孔隙复杂程度为瓦斯的吸附准备了良好条件;突出孔洞构造煤整体孔隙发育情况比原生结构煤要好,微孔、小孔阶段孔隙发育情况远大于原生结构煤。

In order to study the influence of the pore characteristics of tectonic coal and primary structural coal on the gas adsorption characteristics, we take Sanjia Coal Mine outburst hole tectonic coal and primary structure as the research object, use the combining methods of mercury injection and liquid nitrogen adsorption experiment method to study the pore structure of different structures of coal, and then combined with the Menger geometric model, we analyze different structure coal pore fractal characteristics, further elaborate the pore structure fractal characteristics of the impact of gas adsorption characteristics. The results show that: there is hysteresis loop in both primary structural coal and outburst hole tectonicl coal, and the hysteresis loop in outburst hole tectonic coal is obviously larger than that in primary structural coal. The fractal dimension of outburst hole tectonic coal are both greater than that of primary structural coal, and the porosity complexity of outburst hole tectonic coal is higher than that of primary structural coal. The porosity complexity of outburst hole tectonic coal provides good conditions for gas adsorption.The overall pore development of structural coal with outburst pores is better than that of primary structural coal, and the pore development at the stage of micropore and pore is much better than that of primary structural coal.