Study of Porosity Change Law During Spontaneous Combustion of Coal and Its Influence on Spontaneous Combustion of Coalfield Outcrop
The porosity change with spontaneous combustion development of coal and its influence on spontaneous combustion were studied in this paper. On the basis of activation energy theory, the equation of porosity change with the combustion process of coal was deduced. A simplified small-scale experiment and its numerical simulation were preceded. By comparing the results of experiment with those of the numerical simulation, the equation of porosity deduced was validated. At the same time, the porosity change influenced the development of spontaneous combustion of coal from two aspects. One side, the porosity added could increase the reaction area and then accelerated the reaction speed directly. On the other side, the porosity added strengthened the heat convection between gases with high temperature and solid skeleton, and then the reaction speed was increased indirectly. Thus, the porosity change accelerated the spontaneous combustion development of coal. In coal feld outcrop, the acceleration action of porosity change appeared as that the coalfield spontaneous combustion was anisotropic under the action together porosity change with seepage velocity.
spontaneous combustion porosity seepage coal field
WANG Haiyan
Resources and Safety Engineering School,China University of Mining and Technology,Beijing,100083,China
国际会议
The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)
北京
英文
1380-1384
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）