电厂旋风分离器计算机仿真与优化

Computer based Simulation and Optimization of a Power Plant Cyclone Separator

利用计算流体力学 Ｃ Ｆ Ｘ４２ 软件对经改造后的电厂细粉旋风分离器的气固两相流进行了三维数值模拟，其气相流场采用差分雷诺应力模型计算旋转流动，在拉格朗日坐标中计算粒子运动。为优化求解，采用多块结构适体网络，利用 Ｓ Ｉ Ｍ Ｐ Ｌ Ｅ算法解离散方程。给出了经改造后的细粉旋风分离器内不同截面的速度分布和粒子轨迹。证明了经改造后的旋风分离器比常规的旋风分离器分离效果要好。

With the help of a computational fluid mechanics CFX4.2 software a three dimensional numerical simulation was performed of the gas solid two phase flow of a power plant cyclone separator for pulverized coal following its modification. The rotational flow of its gas phase flow field was calculated by the use of a differential Reynolds stress model with the particle movement being computed in Lagrangian coordinates. To attain an optimized solution, employed is a multi block grid with appropriate shaped meshes. Discrete equations were solved by a SIMPLE algorithm. The velocity distribution at various sections and particle trajectory within the modified cyclone separator were presented. It is demonstrated that the modified cyclone separator enjoys a higher efficiency as compared with conventional cyclone separators.