湿式相变冷凝除尘技术对微细颗粒物的脱除研究

摘要

In order to remove fine particle effectively,the particle size was analyzed through Mastersizer 2000 and low pressure impactor. The effects of wet phase transition condensate dust removal system on fine particle agglomeration and removal efficiency were investigated using numerical simulation method. The fine particle at the inlet of system was collected. The structure chart showed that there was only one crest and the crest value was 2. 5μm. There were two crests and the crest value was 2,30μm when the sample was collected in the middle of system which indicated that the process existed significant agglomeration. The system worked better for the particle whose size was below 10 μm. For each size fraction,the removal efficiency was above 70%,even above 85% for 0. 1 to 1 μm particle. The wet phase transition condensate dust removal system was much better than traditional dust removal system. The tube rows accelerated the aggregation of fine particles.%为实现微细颗粒物的有效脱除，采用Mastersizer 2000激光粒度仪和低压撞击器对颗粒物进行粒径分析，研究湿式相变冷凝除尘系统对颗粒物的凝聚、脱除性能；通过数值模拟定性考察颗粒物的凝聚作用，预测湿式相变冷凝除尘技术的除尘效果。结果表明，湿式相变冷凝除尘装置入口颗粒物为峰值2.5μm的单峰分布，中间颗粒物为峰值2和30μm的双峰分布，且大颗粒所占比例高于小颗粒，说明存在显著的颗粒物凝并过程。湿式相变冷凝除尘系统对P M10以下的微细颗粒物有较好的脱除效果，各粒级颗粒物的脱除效率均大于70%，0.1~1μm颗粒物脱除效率在85%以上，明显优于传统除尘设备，表明凝并机制使系统对颗粒物有良好的适应性。流场模拟结果显示管排的存在对流场有明显扰动，可促进微细颗粒物的凝并。