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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 spontaneous combustion of coal left in the gob of 18112 fully mechanized coal mining face in 8 # seam of Xiegou coal mine, the spontaneous combustion mechanism of coal is analyzed from active free radical of coal seam. Based on the standard of spontaneous combustion and “three belts” in goaf and Numerical simulation method was used to calculate the variation of oxidation zone in the gob of the island face with different inlet air volume by using software COMSOL of fluid mechanics to determine the range of oxidation zone. By regression analysis, Regression equation for the width of temperature rise. The results show that air leakage in the goaf is the main cause of spontaneous combustion in the goaf of 18112 island face, and the width of the oxidation temperature increases with the increase of the supply air in the face. After the implementation of the wind fire control technology, the CO concentration in the 18114 return air curtain wall decreased from about 20 × 10-6 to about 5 × 10-6, indicating that the application of the wind fire control technology to prevent and control coal spontaneous combustion It works.