粒径对煤中瓦斯放散初速度影响实验研究

Experimental research of influence of coal particle size on initial speed of methane diffusion

为了分析粒径对煤中瓦斯放散初速度的影响,以某煤矿4号煤层小于7目、7~10目、10~18目、18~35目的自然风干、烘干及水分含量分别为3%、5%、7%的煤样为研究对象,借助WT-1型瓦斯放散初速度测定仪,测试了不同含水率煤样的瓦斯放散初速度与粒径的关系,并测试了自然风干和烘干5h,粒径为小于7目与35~60目、7~10目与35~60目、10~18目与35~60目的煤样,在配比分别为6∶1,5∶2,4∶3,3∶4,2∶5,1∶6情况下的瓦斯放散初速度。实验结果表明,随着粒径减小,不同含水率的煤中瓦斯放散初速度不断增大,且粒径越小,煤中瓦斯放散初速度的增大趋势越明显;煤层中粒径小的煤颗粒占比越大,煤中瓦斯放散初速度越大。

In order to analyze influence of coal particle size on initial speed of methane diffusion,the relationship of particle size and initial speed of methane diffusion of coal samples with different moisture content was tested by use of WT-1type initial speed of methane diffusion tester.The coal samples were collected in No.4coal seam in a coal mine with different particle sizes of less than 7mesh,7-10 mesh,10-18 mesh,18-35 mesh and different moisture content of natural drying,drying,3%,5%and 7%.And the initial speed of methane diffusion of coal samples of natural drying and drying for 5hwere tested,which were with different particle sizes of less than 7mesh 35-60 mesh,7-10 mesh 35~60mesh,and 10-18 mesh 35-60 mesh under different proportion of 6∶1,5∶2,4∶3,3∶4,2∶5and 1∶6.The experimental results show that initial speed of methane diffusion of coal samples with different moisture content increases as the particle size decreases,and the particle size smaller,the increasing trend is more obvious;the proportion of coal particles with small particle size in coal seam larger,the initial speed of methane diffusion of coal samples is larger.