寸草塔煤矿22煤层自燃“三带”分布及影响因素
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摘要
为防止寸草塔煤矿22煤层煤自燃,对22煤层采空区自燃"三带"进行划分.通过现场束管监测获得采空区内氧气浓度分布,并基于氧浓度的"三带"划分标准,得出22煤层采空区自燃"三带"范围,即运胶顺槽:散热带<51 m,自燃带51～147 m,窒息带>147 m;回风顺槽:散热带<43 m,自燃带43～141 m,窒息带>141 m.使用Fluent数值模拟软件模拟不同配风量和瓦斯抽放对自燃"三带"的分布影响,得出了配风量越大、抽放管道进入采空区深度越深、抽采负压越大,氧化带宽度也随之增大,煤自燃的危险性越大.
In order to prevent the 22 coal seam coal in Cuncaota Coal Mine from self-ignition,the "three zones" of spontaneous combustion of goaf in 22 coal seams are divided. Through the on-site beam tube monitoring,the oxygen concentration distribution in the goaf is obtained. Based on the "three-zones"division standard of oxygen concentration,the"three-zones"range of spontaneous combustion of the 22 coal seam goaf is obtained. That is,the transportation lane: heat dissipation belt <51 m,self-ignition belt 51 ～ 147 m,suffocation belt >147 m; return airway: heat dissipation belt <43 m,spontaneous combustion belt 43 ～ 141 m,suffocation belt>141 m. Fluent numerical simulation software is used to simulate the distribution of different air distribution and gas drainage on the "three belts " of spontaneous combustion. It is concluded that the larger the air distribution volume,the deeper the depth of the drainage pipeline into the goaf,and the greater the negative suction pressure. The width of the oxidized zone also increases,and the risk of spontaneous combustion of coal increases,too.
In order to prevent the 22 coal seam coal in Cuncaota Coal Mine from self-ignition,the "three zones" of spontaneous combustion of goaf in 22 coal seams are divided. Through the on-site beam tube monitoring,the oxygen concentration distribution in the goaf is obtained. Based on the "three-zones"division standard of oxygen concentration,the"three-zones"range of spontaneous combustion of the 22 coal seam goaf is obtained. That is,the transportation lane: heat dissipation belt <51 m,self-ignition belt 51 ～ 147 m,suffocation belt >147 m; return airway: heat dissipation belt <43 m,spontaneous combustion belt 43 ～ 141 m,suffocation belt>141 m. Fluent numerical simulation software is used to simulate the distribution of different air distribution and gas drainage on the "three belts " of spontaneous combustion. It is concluded that the larger the air distribution volume,the deeper the depth of the drainage pipeline into the goaf,and the greater the negative suction pressure. The width of the oxidized zone also increases,and the risk of spontaneous combustion of coal increases,too.
引文
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[3]苏全治.综采面采空区自燃“三带”变化规律研究[D].太原:太原理工大学,2012.
[4]史全林,秦波涛,鲁义,等.布尔台煤矿42煤层自然发火规律及防治技术研究[J].煤炭工程,2015,47(8):68-70.
[5]姚元领,胡泊,李洁莹,等.综放面采空区注氮前后"三带"分布数值模拟[J].煤矿安全,2011,42(1):13-16.
[6]李宗翔,许端平,刘立群.采空区自然发火“三带”划分的数值模拟[J].辽宁工程技术大学学报,2002,21(5):545-548.
[7]秦小文,秦波涛,鲁义,等.柳塔煤矿1~(-2)煤层自然发火规律研究[J].煤矿安全,2013,44(5):30-33.
[8]程卫民,孙路路,张孝强.基于氧气浓度分布规律的综采工作面采空区自燃“三带”的特征研究[J].矿业安全与环保,2012,39(5):7-10.
[9]姜伟光.液相质扩散系数的数学描述及实验验证[D].大连:大连交通大学,2008.
[10]刘瑜,陈伟,宋永臣,等.含甲烷水合物沉积层渗透率特性实验与理论研究[J].大连理工大学学报,2011(6):793-797.
[11]高正阳,方立军.混煤燃烧动力学参数的热重试验研究[J].锅炉技术,2000,31(11):9-12.
[12]秦兴林.不同风量条件下采空区自燃“三带”分布规律研究[J].内蒙古煤炭经济,2015(8):185-187.
[13]司爱忠.凤凰山矿采空区自燃“三带”分布规律研究[J].山西焦煤科技,2014(9):14-17.
[14]叶正亮.高位钻孔瓦斯抽放采空区自燃“三带”的数值模拟[J].中国煤炭,2012,38(7):85-89.