综放工作面Y型通风方式下的采空区自燃“三带”研究

Division of Spontaneous Combustion Three-zone in the Goaf of Fully Mechanized Top-coal Caving Face under Y-type Ventilation Mode

为了研究高河煤矿3#煤层W1310工作面采空区在Y型通风(柔膜墙沿空留巷支护)、高抽巷情况下采空区遗煤自燃发火规律、"三带"分布范围,对采空区遗煤自燃做出超前预测。通过在工作面布置束管监测系统,抽取采空区气体并用气相色谱仪化验,分析O_2、CO、CO_2、CH_4、C_2H_2、C_2H_4、C_2H_6等气体浓度变化,综合考虑来划分采空区自燃"三带"范围。最终确定"三带"范围,进风侧:散热带:0～45m;氧化升温带:45～135m;窒息带:大于135m。回风侧:散热带:0～20m;氧化升温带:20～43m;窒息带:大于43m。月推进速度大于70. 8m/月。实践表明,与工作面实际情况非常符合,防止了采空区自燃,为W1310工作面防灭火提供了有效的技术指导。

In order to study the law of spontaneous combustion of coal left behind and the 'three belts'distribution range in goafs under the conditions of Y-type ventilation method( supported by soft-membrane wall along side roadway) and high-level drainage roadway in the goaf of No. 3 coal seam in Gaohe Coal Mine,the advance Prediction of Coal Spontaneous Combustion in Goaf. By arranging the bundle tube monitoring system on the working face,the gas is analyzed by gas chromatograph in the goaf area,and the concentration changes of gases such as O2,CO,CO2,CH4,C2H2,C2H4,C2H6 are analyzed,and these factors are taken into consideration to divide the goaf spontaneous combustion ' three belts' range. The scope of the'three belts'was finally determined. On the intake side: heat dissipation zone: 0~45 m;oxidation temperature rise zone: 45~ 135 m;asphyxiation zone: greater than 135 m. At the return side: heat dissipation zone: 0 ~ 20 m;oxidation temperature rising zone: 20 ~ 43 m;suffocation zone: greater than 43 m. The monthly advance speed is greater than 70. 8 m/month. The practice shows that it is very consistent with the actual situation of the working face,and prevents spontaneous combustion in the goaf,and provide effective technical guidance for fire prevention and extinguishing of the W1310 working face.