电厂烟道气预防遗煤自燃的合理含氧量模拟研究

发布时间：2018-07-02 07:18

本文选题：采空区 + 遗煤自燃　；参考：《中国安全科学学报》2017年03期

【摘要】：为确定电厂烟道气用于遗煤自燃预防的含氧量参数,以塔山坑口电厂及塔山煤矿8105工作面为原型,建立基于计算流体力学(CFD)和煤氧复合理论的遗煤自燃三维数值模型。采用数值模拟方法,研究多场耦合条件下,含氧量为3%9%的烟道气注入采空区后的运移状态以及氧浓度场和温度场的变化规律。结果表明,注入烟道气能够有效惰化采空区遗煤,随注入烟道气含氧量降低,氧化带最大宽度的减小符合Boltzmann函数曲线,同时,遗煤最高温度呈指数下降趋势。降低烟道气含氧量有助于提升遗煤惰化水平,以实测注氮后采空区氧化带宽度为指标,确定7.08%为烟道气用于预防采空区遗煤自燃的合理含氧量上限。
[Abstract]:In order to determine the oxygen content parameters of flue gas used in coal spontaneous combustion prevention in power plant, a three-dimensional numerical model of residual coal spontaneous combustion based on the theory of computational fluid dynamics (CFD) and coal-oxygen compound was established with the prototype of Tashan Hang Kou Power Plant and 8105 face of Tashan Coal Mine. The migration state of flue gas with oxygen content of 39% and the variation of oxygen concentration field and temperature field in goaf were studied by numerical simulation. The results show that injection of flue gas can effectively inerte the residual coal in goaf. With the decrease of oxygen content in flue gas, the decrease of the maximum width of oxidation zone accords with the Boltzmann function curve, and the maximum temperature of residual coal decreases exponentially. Reducing the oxygen content of flue gas is helpful to raise the level of residual coal inerting. Taking the width of oxidation zone of goaf after nitrogen injection as the index, the reasonable upper limit of oxygen content of 7.08% flue gas for preventing spontaneous combustion of coal left in goaf is determined.
【作者单位】：辽宁工程技术大学安全科学与工程学院;辽宁工程技术大学安全工程技术研究院;辽宁工程技术大学矿业学院;
【基金】：国家自然科学基金面上项目资助(51174108,51574143) 山西省科技重大专项项目(20111101017)
【分类号】：TD752.2

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