锥度对旋风除尘器主要性能的影响

为了提高旋风除尘器的分离效率,研究了锥度对旋风除尘器主要性能的影响,建立了气体流场和颗粒动力场的理论模型,并应用SIMPLEC 算法对不同锥度下旋风除尘器内部的总压、切速度、颗粒运动轨迹以及分离效率进行了数值模拟。数值结果表明:旋风除尘器内部的总压和切速度均基本呈轴对称分布,沿半径方向,总压呈非线性增大趋势,而切速度呈"驼峰"分布;通过减小锥度降低了总压和切速度,缩短了颗粒的停留时间,从而提高了分离效率,为旋风除尘器的结构优化设计、提高分离性能提供参考。

Influences of taper on main performances of cyclone separator

In order to improve the separation efficiency of a cyclone separator, the effects of taper on the primary performance of the cyclone separator were studied. A theoretical model of gas-flow and particle-dynamics fields was established, and a SIMPLEC algorithm was employed to simulate the total pressure, tangential velocity, particle trajectory, and separation efficiency with different tapers. The numerical results indicate that both the total pressure and the tangential velocity in the cyclone separator approximately present the axial distribution, and that the total pressure shows a non-linear, increasing trend in the radius direction. The distribution of the tangential velocity was in the shape of a "hump". The decrease of the taper resulted in the reduction of total pressure, tangential velocity, and shortening of the residence time of particles, which can improve separation efficiency. All the above results provide a reference for optimal design of the structure of the cyclone separator, and for enhancement of separation performance.