旋风分离器固体出口结构优化的数值模拟

Numerical simulation on the optimization of solid outlet structure of cyclone separator

为了研究分离器内部流场,解决出口结构优化问题,笔者利用FLUENT提供的RSM和DPM模型对固体收集口底部带有直管段和扩散型管段的旋风分离器进行了数值模拟分析,并对分离器内气相流场进行了数值计算。其结果表明,带渐扩管段的分离器性能要优于带直管段的分离器,固体收集口下压降略高于带直管段的分离器,下降的气流向上的速度大,使部分气流不能进入灰斗,减少了返混现象。

In order to study the internal flow field of cyclone separator, so as to complete the optimization for outlet structure, the author makes the numerical simulation through RSM and DPM provided by FLUENT on the cyclone separators with straight and divergent pipes at the bottom of solid accumulation inlet, and calculates the internal flow flied. The result shows that the separator with divergent pipe is superior to that with straight pipe, with the lower decreased pressure at the solid accumulation inlet than that in the separator with straight pipe and the higher rising speed of decreased air flow, which prevents part of the air flow from entering into ash hopper, so as to reduce back mixing.