气态悬浮焙烧炉排烟系统流场数值模拟及结构优化

Numerical Simulation and Structural Optimization for Flow Field in Smoke Exhaust System of Gaseous Suspension Roaster

为了减少烟气在气态悬浮焙烧炉烟道中的流动阻力,降低风机能耗和工作震动,对原烟道方案进行数值模拟,发现原方案中斜挡板是增大流动阻力的主要因数,换热器后竖直烟道使烟气出口速度分布不合理,使引风机工作时产生震动。通过比较七种改造方案的数值模拟结果,发现采取增设导流板,封闭换热器后竖直烟道等措施能降低流动阻力,使风机前速度分布合理,可达到节能和提高风机寿命的效果。

To reduce the flow resistance of flow gas in the flue of gaseous suspension roaster,decrease the energy consumption and vibration of the induced draft fan,the numerical simulation of original flue scheme was performed,and it was found that the inclined baffle in the original scheme was the main factor of increasing flow resistance,the vertical flue that behind the heat exchanger caused the unreasonable distribution of outlet velocity,resulting in vibration of the working induced draft fan.By comparing the numerical simulation results of seven modification schemes,it was found that the measures of reducing the flow resistance like adding deflector,sealing vertical flue behind heat exchanger would make the distribution of velocity of induced draft fan reasonable,and achieved the effect of energy saving and improving service life of induced draft fan.