湿法烟气脱硫中石膏旋流器底流夹细的试验研究

Experimental Research on Fish-hook Effect in Gypsum Cyclone of Wet Flue Gas Desulfurization

针对石膏旋流器运行时存在的底流夹细问题,对排口比分别为0.500、0.625、0.667、0.714、0.750、0.833和1.000时,石膏浆液中不同粒径颗粒的分级情况进行试验研究,分析不同排口比对底流夹细的影响,以及排口比为0.625时入口压强对细颗粒分级的影响和空气柱对分级效率的影响.结果表明:选取适当的排口比以及入口压力均能有效降低底流中细颗粒的比例,同时能够保证粗颗粒具有较高的分级效率;插入中心棒取消空气柱也能在一定程度上减轻底流夹细现象,但会引起中等粒径颗粒分级效率降低.

To solve the problem of fish-hook phenomenon in gypsum cyclone, experimental tests were car ried out to study the separation efficiency of different sized particles in gypsum slurry at following ratios of underflow to overflow diameter, such as 0. 500, 0. 625, 0. 667, 0. 714, 0. 750, 0. 833 and 1. 000, etc. , so as to analyze the influence of above ratios on the fish-hook effect, and the influence of inlet pressure and air core on the separation efficiency at the ratio of 0. 625. Results show that the percentage of fine particles in underflow can be reduced and high separation efficiency of coarse particles can be obtained when both the ratio of underflow to overflow diameter and the inlet pressure are appropriate. The fish-hook phenomenon may also be reduced by inserting a central solid rod to eliminate the air core; however, this may lead to lowered separation efficiency of medium sized particles.