综放工作面采空区连续注氮防灭火工艺参数仿真优化

Simulating Optimization of Process Parameters for Fire Prevention by Continuous Nitrogen Injection in Goaf of Fully Mechanized Caving Face

为确定5-2S-2综放工作面采空区连续注氮防灭火最佳工艺参数,依据计算流体力学基本理论,构建采空区渗流场物理数学模型,借助于Comsol模拟软件,对不同注氮条件下的采空区氧浓度分布及"三带"划分进行数值模拟研究,得到最佳注氮参数为:注氮量400 m3/h,注氮口位置距工作面30 m,注氮时间15 h/d。

In order to determine the optimal process parameters for fire prevention with continuous nitrogen injection at 5-2S-2 fully mechanized caving goaf. The physical-mathematical model of goaf flow field was established on the basis of the basic theory of computational fluid mechanics. Numerical simulation of goaf oxygen concentration distribution and ＂ three zone＂ division under different nitrogen injection condition was conducted by using COMSOL software. The optimal parameters of nitrogen injection are as follow： 400 m^3/h injection capacity of nitrogen,nitrogen injection port position away from the face of 30 m,the nitrogen injection time of 15 h / d.