钱营孜西翼煤柱工作面防灭火技术参数优化研究

Research on Optimization of Fire Prevention Technical Parameters of Zixi Wing Coal Pillar Working Face in Qianying

采空区遗煤自燃一直是防灭火工作的重点。为研究钱营孜西翼煤柱工作面注二氧化碳与氮气对采空区遗煤自燃的惰化效果,通过Fluent数值模拟软件建立西翼煤柱工作面物理模型,分别研究了注二氧化碳与注氮气在不同注气位置、不同注气量下的惰化情况,并对两种气体的惰化效果进行了对比。研究表明:二氧化碳注气口距工作面40 m、注气量为1000 m3/h对采空区惰化效果最佳;氮气注气口距工作面30 m、注气量为1000 m3/h时对采空区惰化效果最佳。注入二氧化碳后的氧化带宽度相比于注入氮气后的氧化带宽度平均减少了约3 m。

Spontaneous combustion of coal left in goaf is always been the focus of fire prevention work. In order to study the inert effect of CO2 and nitrogen injection on spontaneous combustion of coal left in goaf at the working face of Zixi wing coal pillar in Qianying, the physical model of the working face of the west wing coal pillar was established by Fluent numerical simulation software, and the inert situation of CO2 and nitrogen injection at different gas injection positions and different gas injection volumes were studied respectively. The inerting effects of the two gases were compared. The results show that the best effect on goaf inerting is when the carbon dioxide injection port is 40 m away from the working face and the gas injection is 1000 m3/h. When the nitrogen injection port is 30 m away from the working face and the gas injection is 1000 m3/h, the effect on goaf inerting is the best. The width of the oxidation zone after CO2 injection is reduced by about 3 m on average compared with that after nitrogen injection.