焦煤孔隙结构形态的实验研究

利用微焦点显微CT技术和压汞法分别对东曲2号焦煤的孔隙结构进行测试，综合分析两种方法所测结果，从孔隙连通性和尺度两个方面，全面研究了2号焦煤的孔隙结构和形态特征。研究表明:2号焦煤的孔隙率为17.2%，连通的开放孔隙占27.04%，封闭孔隙占72.96%；孔径大于0.64 μm的孔占67.74％，孔径介于0.64 μm和7.50 nm的孔占32.26%，但比表面积占总比表面积的93.4%，煤中微孔径的孔数量很大；大量微孔径孔和封闭孔的存在导致煤体渗透性、连通性很差。东曲2号煤的封闭孔多呈圆形、葫芦形和不规则形，孔隙壁厚，连通团呈镂空的雪片状，相互连通的吼道小且少。

Experimental study on pore structure and pore shape of coking coal

Using micro focus CT and Hg injection,pores structure of Dongqu No.2 coking coal were tested，and two groups of data were got.From the two points of view—connectivity and scale of pores，characteristic of pore structure and shape were analyzed synthetically.The results show that porosity of No.2 coking coal is 17.2%,the ratio of connectivited open pore to all pores is 27.04%,that of closed pore is 72.96%;the percentage of the pore which aperture is more than 0.64 μm is 67.74％,the percentage of which pore aperture is from 0.64 μm to 7.50 nm is 32.26%.But the ratio of its specific surface area to total specific surface area is 93.4%,so the quantity of micro pores is large,large number of micro pores and closed pores result in low permeability and poor connectivity.Closed pore of Dongqu No.2 coal are round,gourd shaped or irregular,pore walls are thick.Connectivity group are like hollowed out snowflakes,pore throats connected each other are few and small.