复杂沟通条件下遗煤自燃规律的数值模拟

Numerical simulation on spontaneous combustion of residual coal with complicated contacts

为了解决复杂沟通条件下遗煤自燃的防治问题,应用数值模拟方法对放顶煤采空区遗煤自燃规律进行了研究.建立了放顶煤采空区遗煤自燃数学模型,并对复杂沟通条件下的放顶煤采空区遗煤自燃规律进行了数值模拟研究.在深部内部漏风边界有高氧浓度时,采空区自燃位置有两处,当考虑老空区内部瓦斯浓度很高和老空区耗氧情况,采空区自燃位置只有一处.只有注氮与阻化联合使用,才能避免放顶煤采空区遗煤自燃的发生.遗煤自燃发火期与工作面推进速度成正比关系,与工作面风量、遗煤氧化速度常数成反比关系.该研究对放顶煤采空区遗煤自燃的防治具有一定的指导意义.

In order to solve the problem of preventing spontaneous combustion of residual coal in the goaf of a fully mechanized top-coal caving face with complicated connections and contacts,a numerical simulation method was applied to model the spontaneous combustion characteristics of residual coal in the goaf of a fully mechanized top-coal caving face.A mathematical model of the spontaneous combustion of residual coal at a fully mechanized top-coal caving face was developed.Using the model developed,the spontaneous combustion characteristics of residual coal with complicated contacts were simulated.The spontaneous combustion of residual coal occurs in two locations when oxygen concentration is high in goaf.The spontaneous combustion of residual coal occurs in one location when the mine gas and the consumption of oxygen are conditioned.When both nitrogen injection and negative catalyzer are used together,the spontaneous combustion of residual coal can be prevented.The spontaneous combustion period of residual coal is positively proportional to the advance rate of working face and is inversely proportional to the ventilation air quantity of working face and the oxidation rate of residual coal.This paper provides a good reference for preventing the spontaneous combustion of residual coal in the goaf of a fully mechanized top-coal caving mining face.