摘要
根据热力学、传热学理论,分析了煤自燃热量的积聚过程,推导出煤自燃的热量传递方程,从而得知煤体升温的必要条件.影响煤体热量积聚的主要因素有温度、浮煤厚度、空隙率和漏风强度.温度越高,煤体氧化放热强度越大,煤体与围岩温度差越大,越不利于煤体的热量积聚;浮煤厚度是放热和蓄热的物质基础,只有大于最小浮煤厚度,煤体才有可能自燃;空隙率决定松散煤体内漏风强度和导热系数的大小;漏风强度对煤体氧化放热和对流散热都有影响,漏风强度必须大于提供足够氧气所需的最小值,小于上限漏风强度,煤体才可能自燃.
According to the theory of thermodynamics and heat transfer, the heat accumulating process of coal selfignite is analyzed, and the equation of heat transfer is deduced, and the requirement of coal temperature raised during coal selfignite is known. The major effect factors of heat accumulating has temperature, float coal thickness, air leak intensity and voidage. The higher temperature is, the bigger heat liberation intensity is, the bigger temperature difference between coal and rock of surround is; it is more disadvantages for heat accumulating of coal. The float coal thickness is material basis of heat production and thermal storage, as it is bigger than the least float coal thickness, coal selfignite is possible. The voidage determines air leak intensity and thermal conductivity. The air leak intensity affects both heat liberation intensity and convection heat elimination. Coal selfignite is possible as air leak intensity is less than upper limit air leak intensity and bigger than the minimum value, which it can offer enough oxygen concentration.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2003年第4期370-374,共5页
Journal of China Coal Society
基金
国家杰出青年基金资助项目(50125414)
陕西省自然科学基金资助项目(2001D06)
关键词
煤自燃
热量积聚
漏风强度
浮煤厚度
coal self-ignite
heat accumulating
air leak intensity
float coal thickness
