4种脱硫喷嘴雾化特性对比试验

对目前湿法烟气脱硫系统中常用的4种机械式雾化喷嘴进行了雾化试验,采用高速数码摄影法对4种喷嘴在不同压力下的喷雾状况进行测试,并用ImageJ软件处理,得到各喷嘴在不同工况下的粒径、粒径分布和雾化角等特性。研究结果表明:4种喷嘴雾化粒径随液压的增大呈减小趋势,其中螺旋喷嘴雾化粒径最小,扇形喷嘴雾化粒径最大;螺旋喷嘴、空心锥喷嘴和扇形喷嘴的雾化角随液压增大变化不大,较为稳定,实心锥喷嘴雾化角随液压增大而增大,螺旋喷嘴与扇形喷嘴的雾化角较大,空心锥喷嘴的雾化角最小;各喷嘴在小于0.2MPa的液压下粒径分布不均匀,当达到0.2MPa后粒径分布较为均匀。综合结构特点和雾化特性,螺旋喷嘴较适用于火电厂湿法烟气脱硫系统。

Contrast Experiment of the Spray Characteristics of Four Atomizing Nozzle

A series of atomization experiments is done for four commonly used atomizing nozzles in wet flue gas desulfurization.A high speed digital camera is used to take the atomization photos under different hydraulic pressure and the photos are analysised with ImageJ.Then get the spray particle,distribution of the spray particle and the spray angle.The results of the experiments show that the pray particles of four kinds of nozzle become smaller with the increase of the hydraulic pressure.The pray particle of spiral nozzle is smallest and that of fan-shaped nozzle is largest.The spray angles of spiral nozzle,fan-shaped nozzle and hollow cone nozzle are relatively stable with the increase of the hydraulic pressure.And that of Solid cone nozzle becomes larger with the increase of the hydraulic pressure.The spray angles of Spiral nozzle and Fan-shaped nozzle are relatively larger and the spray angle of Hollow cone nozzle is smallest.The spray particles of all the four kinds of nozzle are unevenly distributed under 0.2MPa and are relatively evenly distributed above 0.2MPa.Comprehensively considering the structural characteristics and atomization characteristics,spiral nozzle is more suitable for wet flue gas desulfurization system in thermal power plant.