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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。
In order to determine the oxygen content parameters of power plant flue gas for the prevention of spontaneous combustion of coal, the three-dimensional numerical value of coal spontaneous combustion based on computational fluid dynamics (CFD) and coal-oxygen complex theory model. The numerical simulation method was used to study the migration of flue gas containing 3% and 9% oxygen in goaf and the variation of oxygen concentration and temperature fields under multi-field coupling conditions. The results show that the injection of flue gas can effectively inertize the coal left in the goaf. With the decrease of the oxygen content in the injected flue gas, the decrease of the maximum width of the oxidation zone conforms to the Boltzmann function curve. Meanwhile, the maximum temperature of coal left an exponential declining trend. Reducing the oxygen content of flue gas helps to enhance the inerting level of coal during coal injection. Taking the actual measured oxidation zone width of gob in nitrogen injection as an indicator, 7.08% of flue gas is used to prevent spontaneous combustion of coal in goaf. The upper limit of oxygen.