烟气风机流体分析及控制策略

Gas Flow Analysis and Control Strategy of Flue Gas Fan

以某冶炼厂2台烟气高温风机的出口流体为研究对象,进行有限元仿真模拟,得到不同风机工况条件下烟气流体的三维仿真模型,并对比风机实际使用情况,验证仿真模型可靠性,最后得出2种工艺路线下最优的风机控制策略和方法。仿真结果显示,2台风机串联时,不同风机满负荷时引风效果相差较大;2台风机并联时,任一台满负荷运行,另一台风机流量控制在222000 m^(3)/h,引风效果突出;当引风效果已达到最优时,继续增加风机负荷反而会降低引风效果。

Taking the outlet fluid of two flue gas fans in a smelter as the resear ch object,a 3 D offgas flow model was built and finite element simulation was used to determine the offgas hydraulics under various working conditions of the fans.The reliability of the 3 D model was then verified against actual fan operation,and optimal fan control strategies and methods for two process routes were developed.According to the simulation results,when the two fans operate in series,the inducing effect of the fans at full workload differ widely.When the fans operate in parallel,remarkable inducing effect can be achieved when one operates at full load while the other flow is controlled at 222000 m^(3)/h.Further increasing the load however will reduce the total induction performance.