关键词: 旋风分离器, 高温, 流场, 数值模拟

Abstract: In the temperature range from 293 K to 1273 K and the inlet gas velocity at 20 m/s, the flow field in a volute cyclone separator with 300 mm diameter has been numerically simulated using a modified non-isotropy RSM model on the platform of commercial CFD software package, FLUENT 6.1. The predicted results are in agreement with the experimental data. The computational results show that temperature increase affects gas velocity vector much, especially tangential component. The temperature increase results in the tangential velocity decrease. This tendency, however, becomes smooth when the temperature is above 1000 K. The correlation between tangential velocity and temperature is expressed as . The influence of temperature on the axial velocity can contribute to the change of rotation intensity of the tangential velocity. The downward axial velocities decrease when the rotation intensity becomes small at high temperatures, but the upward ones increase a little. The increase of temperature affects the separation performance of cyclone separator by changing the gas viscosity and tangential velocity. When temperature is to 1273 K, the increase of gas viscosity increases the cut-size diameter 1.58 times and the decrease of gas tangential velocity increases the cut-size diameter 1.23 times. The effect of gas tangential velocity on the separation performance of cyclone is approximately equal to the effect of gas viscosity.

Key words: cyclone separator, high temperature, flow field, numerical simulation