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采用计算流体动力学方法对某电厂75t/h秸秆直燃锅炉建立了实际尺寸的冷态数学模型并用现场数据加以验证。模拟示踪剂脉冲进样,通过监测炉膛出口示踪剂质量流率的变化,计算气体在炉膛内的停留时间。结果显示:随着总风量的减小,气体平均停留时间增加;在所研究的工况内,总风量不变时,二次风比例的增大对平均停留时间的影响不大,但停留时间分布曲线呈现早出峰、低峰值、长拖尾的现象,说明气体混合更均匀。
A computational fluid dynamics (CFD) method was used to establish the actual cold model of 75t / h straw fired boiler in a power plant and verified with field data. The simulated tracer pulsed injection was used to calculate the residence time of gas in the furnace by monitoring the change of tracer mass flow rate at the exit of the furnace. The results show that with the decrease of total air volume, the mean residence time of gas increases. In the studied condition, when the total air volume is constant, the increase of the secondary air proportion has little effect on the average residence time, but the residence time Distribution curve showing early peak, low peak, long tail phenomenon, indicating more uniform gas mixture.