刘庄矿综采工作面动态注氮参数的优化

Optimization of Dynamic Nitrogen Injection Parameters in Fully Mechanized Working Face of Liuzhuang Coal Mine

为了研究注氮对采空区遗煤自燃"三带"分布的影响,基于"O"型冒落压实和Bachmat非线性渗流模型,运用Fluent软件对刘庄矿171101工作面采场的漏风分布情况进行了数值模拟,模拟得到的工作面风量分布与现场实测结果基本吻合。在此基础上,利用组分输运模型,对不同注氮位置下的采空区内多组分气体浓度场进行模拟分析,结果表明:注氮前、后的采空区内氧气浓度分布发生了明显的变化,特别是在注氮口附近,氧气浓度降低较为明显;甲烷浓度无明显变化。通过多方案比较,优化得到注氮口设置在距离工作面在10~30 m,注氮效果较佳。

In order to study the influence of nitrogen injection on the distribution of residual coal spontaneous combustion of＂three belts＂in the goaf,based on the＂O＂type slump compaction and the model of Bachmat nonlinear seepage,the distribution of air leakage in the stope of 171101 working face in Liuzhuang Coal Mine was numerically simulated by using Fluent software. The simulated air volume distribution of the working face was basically consistent with the result of field measurement. On this basis,the component transport model was used to simulate and analyze the concentration fields of multicomponent gas under different nitrogen injection sites. The results showed that the oxygen concentration in the goaf changes obviously before and after nitrogen injection,the oxygen concentration decreases particularly significant especially in the vicinity of the nitrogen injection port,and there is no great change in methane concentration. By comparing multiple programs,it can be concluded that when the nitrogen injection port is set 10 m to 30 m from the working face,the effect of nitrogen injection is better.