摘要：提出一种进气口顶部、分离器顶板之下的新型二次风引入口, 通过数值模拟和实验考察该二次风对PV型旋风分离器性能的影响。结果表明:引入该二次风后, 分离器内气流切向速度增大, 上行轴向速度和径向速度减小;二次风可有效抑制顶灰环产生, 减小升气管短路流的粉尘量;引入进气口顶部二次风后, 分离器的最大效率增加约2%, 压降最大减少16.8%;总处理气量增加、压降减小, 显示出明显的高效低阻特征。

关键词：旋风分离器；二次风；分离性能；流场

Abstract：A new type secondary wind, located at the top of inlet and under the roof of the separator, was proposed, and the effect of the secondary wind on the separation performance of PV cyclone separator was analyzed experimentally and numerically.The results show that the simulation results agree well with the experimental data and prove that the model is reliable. With secondary wind, the tangential velocity increases, the upward axial velocity and radial velocity decreases. The secondary wind can restrain the formation of top particle ring and reduce the possibility of conveying particles to vortex finder through the short circuit flow, which is beneficial to the separation of fine particles.The cyclone separator with secondary wind still retains high separation efficiency under the condition of greater gas flow rate.In addition, the separator with secondary wind can achieve higher efficiency and lower pressure drop than PV type, with the maximum efficiency increase by 2% and the maximum pressure drop decrease by 16.8%. The new structure of secondary wind may provide a new design idea for the application of industrial high-efficiency and low-resistance cyclone separators.

Keywords: cyclone separator；secondary wind；separation performance；flow field