摘要
为了防治斜沟煤矿8#煤层18112综采孤岛工作面采空区遗煤自然发火,从煤的活性自由基角度分析了煤炭自燃机理,并基于采空区自燃"三带"划分标准和数值模拟的方法,采用流体力学COMSOL计算软件,研究了孤岛工作面在不同进风量时采空区氧化升温带的变化规律,确定氧化升温带的范围;通过回归分析方法得到工作面供风量与氧化升温带宽度的回归方程。研究结果表明,采空区漏风是导致18112孤岛工作面采空区自然发火的主要原因;氧化升温带宽度随着工作面供风量的增加而变大。实施以风治火技术后,18114回风密闭墙内CO浓度由开始超过20×10-6降至5×10-6左右,表明运用以风治火技术防治斜沟煤矿采空区遗煤自燃是可行的。
In order to prevent coal spontaneous combustion in goaf of 18112 fully-mechanized caving island coal face that is located in 8#coal seam of Xiegou coal mine,the mechanism of coal spontaneous combustion is analyzed from the view of the active radicals,according to the division standard of spontaneous combustion ' three zones' in goaf and numerical simulation method,the change law of oxygenation heating-up zone in goaf under different air supply volumes is studied and the scope of oxygenation heatingup zone is determined by using the computational fluid dynamics COMSOL software. The regression equation between air supply volume of the working face and the width of oxygenation heating-up zone is obtained by conducting regression analysis. The study results show that air leakage in goaf is the main reason of spontaneous combustion in goaf of 18112 fully-mechanized caving island coal face,the with of oxygenation heating-up zone is enlarged with the increasing of the air supply volume. The application results of the fir prevention and control technology of controlling air volume show that the concentration of CO in 18110 return air closed wall of goaf is decreased from 20 × 10- 6to 5 × 10- 6,it is further indicated that is is feasible to prevent spontaneous combustion of residual coal in goaf of Xiegou coal mine by using wind preventing fire technology.
出处
《现代矿业》
CAS
2016年第11期191-195,共5页
Modern Mining
关键词
综采孤岛工作面
数值模拟
采空区漏风
以风治火
自燃机理
Full-mechanized isolated island caving face
Numerical simulation
Goaf air leaking
Wind preventing fire
Spontaneous combustion mechanism
