Abstract: Gypsum cyclone is an important equipment of wet flue gas desulfurization system (WFGD) in power plant and air core is a special phenomenon in it. Instability of air core may cause some problems, such as waste of energy, unsteady flow, and lower separation efficiency. A new conical central solid rod was designed aiming at eliminating air core and improving the performance of gypsum cyclone. Experiments were carried out in order to have further understanding of the negative influence by air core. At the same time, the performance of different gypsum cyclones with central rod, including production capacity, concentration of underflow, solid content in underflow and particle size distribution was measured and compared, and the effects on above-mentioned parameters by different inlet pressures were investigated. By inserting a conical central rod, production and solid content in underflow could be increased by 18% and 22% respectively. The adaptability to fluctuating inlet pressure could be improved obviously, and the amount of fine particles in underflow was effectively reduced.

Key words: central rod, centrifugation, particle size distribution, multiphase flow, gypsum cyclone

摘要： 针对火电厂石膏旋流器运行中存在空气柱及底流夹细等问题，设计倒锥形中心棒取消空气柱，改善石膏旋流器的工作性能。采用实验方法分析不同入口压强下石膏旋流器性能的变化情况，得到无中心棒、圆柱形中心棒、倒锥形中心棒对生产能力、底流浓度、底流含固量以及底流浆液中石膏颗粒分布的影响。结果表明：与无中心棒相比，采用倒锥形中心棒能够使生产能力提高18%，底流含固量增大22%，分级性能对入口压强具有良好的适应性，并能够有效缓解底流夹细现象。

关键词: 中心棒, 离心分离, 粒度分布, 多相流, 石膏旋流器