新型入口对石膏旋流器工作性能的影响

针对火电厂石膏旋流器分级效果不理想的问题,设计具有分离块和隔板的新型入口,以改善石膏旋流器的工作性能。采用Fluent软件,应用Reynolds应力模型(RSM)与离散相模型(DPM)模拟新型入口中不同粒度颗粒的运动情况,模拟结果表明:随颗粒粒径增大,颗粒的运动半径与运动距离均增大,不同粒径颗粒在新型入口内能实现初步分级。对普通入口与新型入口石膏旋流器分别进行性能实验,获得不同工况下生产能力、出流浆液密度以及旋流器分级效率等指标参数,经比较可知,采用新型入口后,石膏旋流器底流质量浓度明显增大,10～30 μm石膏颗粒的分级效率有显著提高,最大增幅可达15%,同时,6 μm以下石膏颗粒的底流夹细现象也有一定程度的改善,但由于入口段流动阻力增大,生产能力略有下降。

Influence of new inlet on performance of gypsum hydrocyclone

A new inlet of the gypsum hydrocyclone with separation block and guide plate was presented in this paper. The particle trajectories in conventional hydrocyclone and particle movements in new inlet were simulated by computational fluid dynamics (CFD) with the Reynolds stress model (RSM) and discrete phase model (DPM). The simulated results showed that both particle moving radius and distance increased when the particle diameter became greater. Gypsum particles with variable size were separated at the new type of inlet, which was beneficial to the classification performance of the hydrocyclone. Experiments were carried out in order to have further understanding of the new inlet. It was found that the classification efficiency of particles with the diameter between 10 and 30 μm was obviously improved about 15% compared to the conventional hydrocyclone. The classification efficiency of particles with the diameter less than 6 μm presented a certain drop. At the same time, the density of underflow slurry increased apparently.