具有中心棒的石膏旋流器流场特性及分离性能研究

Study on Flow Characteristics and Separation Efficiency of a Gypsum Cyclone with Central Solid Rod

针对火电厂湿法烟气脱硫系统中石膏旋流器存在的空气柱现象,采用Fluent软件对空气柱的发展过程进行模拟,分析了圆柱形和倒锥形中心棒对石膏旋流器内速度场的影响,对不同结构下旋流器的分级效率进行了比较.结果表明:空气柱内气体为螺旋流动;采用倒锥形中心棒在消除空气柱的同时,对切向速度的影响较小,能够延长石膏浆液在柱段内的停留时间,且对粗颗粒的分离效率也有明显提高,可有效避免"溢流跑粗"现象.

To eliminate the air core phenomenon formed in gypsum cyclone of a WFGD （wet flue gas desulfurization） system, numerical simulation was carried out on the process of air core development using Fluent software, while an analysis performed to the influence of cylindrical/cone-shaped central solid rod on the velocity field in the cyclone, and a comparison made to the separation efficiency of cyclone with different structures. Results show that the air flows spirally in the core; with the insertion of solid cone rod, the air core phenomenon is eliminated, the tangential velocity is slightly affected, the lingering time of gypsum slurry is elongated in the cyclone, resulting in an increased separation efficiency of coarse particles.