基于OpenFOAM模拟二次风对旋风分离器性能的影响

Numerical Simulation of Influence of Secondary Wind on Cyclone Separator Performance Based on OpenFOAM

基于开源软件OpenFOAM建立旋风分离器气固两相流数值计算模型,考察了二次风对旋风分离器性能的影响,比较了模拟结果与实验数据.结果表明,模拟结果与实验数据吻合度较好,压降和效率平均误差分别为9.89%和1.33%,模型可靠;二次风可有效削减二次流,减少上灰环和短路流,提高分离效率;二次风风速增加,旋风分离器的分级效率增加但增加速率逐渐降低.旋风分离器压降随二次风风速增加而增加,二次风入口速度达到15,25和30 m/s时,旋风分离器压降分别达到无二次风时压降的2,3和4倍,引入二次风同时应综合考虑能耗和效率.

The gas-solid two phase flow numerical model in cyclone separator was built using open source software OpenFOAM in this study, and the simulation results were compared with the experimental data. Based on this model, the effect of the secondary wind on the separation performance of cyclone separator was analyzed. The results show that the simulation results coincide with the experimental data, and the average error of pressure drop and the separation efficiency is 9.89% and 1.33%, respectively, which proves the numerical model to be right. In addition, the secondary wind can weaken the secondary flow effectively, thus reduce the up ash loop and short circuit flow, and increase the separation efficiency of the cyclone separator. The grade efficiency of the cyclone separator increases with the velocity of the secondary wind, but the increase rate is gradually decreased. The pressure drop of the cyclone separator increases with the velocity of the secondary wind. When the velocity of the secondary wind are 15, 25, and 30 m/s, respectively, the pressure drop of the cyclone separator has reached 2 times, 3 times and 4 times of that with no secondary wind. Therefore, the energy consumption and efficiency are taken into account when introducing the secondary wind to the cyclone separator.