喷淋塔内可吸入颗粒物的脱除与凝结增长特性  

Removal and condensation growth of inhalable particles in spray scrubber

作　　者：凡凤仙[1] 杨林军[2] 袁竹林[2] 胡晓红[1] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]东南大学能源与环境学院,江苏南京210096

出　　处：《化工学报》2010年第10期2708-2713,共6页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2002CB211604);国家自然科学基金项目(20576020);上海市自然科学基金项目(10ZR1420900)~~

摘　　要：The efficiency of removing inhalable particles in a conventional spray scrubber was examined by the theory of wetting dust removal,and condensation growth properties of inhalable particles in the supersaturated vapor environments were investigated using a condensation growth dynamic model.The results show that the removal efficiency of inhalable particles is only 16% for the conventional spray scrubber,and vapor condensation is able to cause the submicron particles to grow rapidly into big dusty droplets in very short time.For case with vapor saturation of 1.3 and particle number concentration of 105 cm-3,the fine particles with diameter less than 0.5 μm can shoot to around 0.8 μm in 50 ms.The final diameters of condensation droplets are little affected by the initial particle diameter,but depend mainly on initial vapor saturation and particle number concentration.It is found that the final droplet diameter increases with increase of saturation degree of vapor,while it decreases with increase of particle number concentration.These results could be used as a theoretical basis and technical guidance for practical application of vapor heterogeneous condensation to promote condensation growth and effective removal of inhalable particles.The efficiency of removing inhalable particles in a conventional spray scrubber was examined by the theory of wetting dust removal,and condensation growth properties of inhalable particles in the supersaturated vapor environments were investigated using a condensation growth dynamic model.The results show that the removal efficiency of inhalable particles is only 16% for the conventional spray scrubber,and vapor condensation is able to cause the submicron particles to grow rapidly into big dusty droplets in very short time.For case with vapor saturation of 1.3 and particle number concentration of 105 cm-3,the fine particles with diameter less than 0.5 μm can shoot to around 0.8 μm in 50 ms.The final diameters of condensation droplets are little affected by the initial particle diameter,but depend mainly on initial vapor saturation and particle number concentration.It is found that the final droplet diameter increases with increase of saturation degree of vapor,while it decreases with increase of particle number concentration.These results could be used as a theoretical basis and technical guidance for practical application of vapor heterogeneous condensation to promote condensation growth and effective removal of inhalable particles.

关 键 词：喷淋塔 可吸入颗粒物 过饱和蒸汽 凝结增长 脱除 

分 类 号：X51[环境科学与工程—环境工程]