Research on relationship between porosity of coal, amount of air leakage and gradient of wind pressure
About half of Chinas underground mining coal seams have risks of spontaneous combustion,and the condition of airflow in coal directly influences coals nature of spontaneous combustion.In the experiment,through putting pulverized coal of certain porosity into ventilating tube and attracting wind with pipe-type ventilator at an end,the differential pressure of both ends of the ventilating tube and the ventilating volume in tube are determined.Results of experiment show that the ratio of gradient of wind pressure and amount of air leakage per unit area is stationary for coal sample of certain porosity.In the process of porosity increasing from 0.4 to 0.6 and corresponding p/q increasing from 7.248 2 to 1 840.4,as long as any one of value of p/q and porosity is fixed,the other one can be fixed.This has certain referencing value for further improving the theory of spontaneous combustion of coal and preventing technology against spontaneous combustion of coal.
coal porosity air leakage wind pressure
ZHANG Yinghua BAO Na HUANG Zhian XUE Bo GAO Yukun
State Key Laboratory of High-Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China
国际会议
2012 International Symposium on Safety Science and Technology (2012安全科学与技术国际会议)
南京
英文
774-779
2012-10-23（万方平台首次上网日期，不代表论文的发表时间）