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采用自主研发的火区启封及复燃模拟实验系统,对煤在不同温度、湿度、通风强度等条件下火区的复燃特性及气体产物的生成规律进行研究。研究表明:火区的复燃是一种火灾动力学现象。火区气体温度降到80～90℃时,即使煤体温度高达250～260℃,CO、CH4、C2H6和C2H4依然存在且浓度都较高时,启封并供氧仍不发生复燃。模拟实验条件下,可以通过测量火区气温,观察H2、CO及烃类气体浓度变化趋势是否增加来判断火区是否熄灭。这为煤矿自燃火区封闭后启封提供了参考依据。
The self-developed fire zone unsealed and re-ignited simulation experiment system was used to study the reignition characteristics of coal and the generation of gas products under different temperature, humidity and ventilation intensity. Research shows that the resurgence of the fire area is a kind of fire kinetic phenomenon. When the gas temperature in the fire zone dropped to 80 ~ 90 ℃, even if the coal temperature was as high as 250-260 ℃, CO, CH4, C2H6 and C2H4 still existed and the concentrations were high, the unsealing and oxygen supply still did not reignite. Simulated experimental conditions, you can determine the fire area by measuring the temperature of the fire area to observe whether H2, CO and hydrocarbon gas concentration trends increase. This provides a reference for the spontaneous combustion of coal mines closed after the opening seal.