堵漏风对煤自燃气态产物生成规律的影响

摘要

In order to study coal seam fire evolution and the influence of the decrease of air amount on coal spontaneous combustion gaseous products,the experimental device for testing coal spontaneous combustion characteristic parameters is carried out to do temperature-programmed experiment under the condition of reducing air volume,and coal spontaneous combustion process and laws on taking measures about plugging the air leakage channel and reducing air leakage at coal mine site after critical temperature are simulated.The results show that the amount of air leakage has little influence on the range of dryness temperature;the volume fraction of each gas product has similar characteristics with the variation of wind volume,that is,the decrease of air volume accelerates the production of gaseous products at the range of 80 ℃ to 140 ℃,and restrains acceleration after 140 ℃.%为了研究煤层火灾发展及实施防灭火过程中漏风量减小对煤自燃气态产物的影响,采用煤自燃特性参数测试实验装置进行减风量条件下的程序升温实验,模拟煤自然发火至临界温度后,煤矿现场通常实施封堵漏风通道、降低漏风供氧措施对煤自燃的影响过程和规律.结果表明:堵漏风对煤自燃的干裂温度范围基本没有影响;各气体产物体积分数随风量而变化的规律具有相似的特点,即在80～140℃温度范围内风量降低对气态产物的生成具有促进加速的作用,在140℃以后具有抑制加速的作用.