煤田露头自燃火风压数值的理论分析

Theoretical analysis of numerical value of the spontaneous combustion fire-heating air pressure for coalfield outcrop

通过对煤田露头自燃的调查,利用渗流运动方程、气体状态方程和传热学等有关理论,对火风压影响因素进行了分析,得出自燃点深度、煤层赋存倾角、渗透率、地形和风速等对火风压的贡献.重点是通过调查建立了煤田自燃物理模型,并利用流管、气体能量方程等求出在地形、风速等影响下的火风压计算式.

Based on the investigation on the spontaneous combustion of coalfield outcrop （SCCO）, analyzed factors of influencing thermal draft pressure caused by the fire using seepage movement equation, gas state equation and heat transfer etc. The contribution of the depth of combustion point, the pitch of coal bed, seepage, topography and wind to fire-heating air pressure were got. After investigation, the physical model of SCCO was built. Using stream capillary and gas energy equation, the calculation formula of fire-heating air pressure was got under the condition of topography and wind.