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为了在理论上分析注氮后采空区自燃环境和状态的变化情况,通过FLUENT软件求解包含多孔介质中动量、质量和热量传递关系的数学模型研究了注氮前后采空区自燃带范围的改变,以及降温范围和降温幅度.结果表明:自燃带分布在进回风侧呈不均匀对称分布,注氮后氧化带范围出现回缩前移,注氮口附近降温明显,降温幅度从注氮近点至远点依次降低,降温范围随着时间增加而扩大.研究结果表明注氮对采空区的降温存在一个时间上的延迟,现场施工应综合考虑多种客观因素对注氮起效时间进行预估.
In order to theoretically analyze the change of spontaneous combustion environment and state in goaf after nitrogen injection, the mathematical model of the relationship between momentum, mass and heat transfer in porous media was solved by FLUENT software to study the change of spontaneous combustion range before and after nitrogen injection , As well as the range of temperature drop and temperature drop.The results show that the distribution of auto-ignition zone is unevenly distributed on the inlet-return air side, the range of oxidation zone retracts forward after the nitrogen injection, and the temperature drop near the nitrogen- Point to far point in turn reduce the scope of the cooling temperature increases with time to expand.The results show that injection of nitrogen on the goaf cooling there is a time delay, site construction should take into account a variety of objective factors for the onset of nitrogen injection time Estimated.