应用电声换能超声波雾化方法提高超细颗粒捕集效率  

Improvement of ultrafine particles separation efficiency by electro-acoustic ultrasonic nebulizer

作　　者：王光旭[1] 徐国栋[1] 刘文婧[1] 王博[1] 陈延信[2] 徐德龙[2] 

机构地区：[1]兰州大学资源环境学院,兰州730000 [2]西安建筑科技大学粉体工程研究所,西安710055

出　　处：《环境工程学报》2013年第1期294-300,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(50906036);教育部新世纪优秀人才支持计划项目(NCET-10-0469);教育部"国家大学生创新性实验计划"项目(101073022)

摘　　要：针对大气环境污染控制中超细颗粒难以捕集的问题,提出了一种高效、经济的新方法。其核心思想是将经电声换能超声波雾化得到的相对湿度过饱和雾气喷入含尘气体中,在"云"物理学、碰撞团聚等原理共同作用下,饱和水蒸汽在颗粒表面凝结,使超细颗粒的粒径增大,增加其捕集效率。为了证明这种方法的有效性,建立了小型电声换能超声波雾化捕尘实验台并在旋风除尘器中进行实验研究。实验结果表明,随着雾气浓度的增加,总除尘效率与超细颗粒的分级效率均有明显提高,并且旋风除尘器的压降(能耗)明显降低。A new efficient and economical method has been established to improve the ability capturing the ultrafine particles from the dusty air. The saturated water vapor created by the electro-acoustic ultrasonic nebu- lizer is charged into the dusty gas. According to the ＂cloud physics＂ and collision theory, the saturated water va- por coagulates on the particle surface and the particle size increases. As the result, the separation efficiency of the ultrafine ones rapidly goes up. To prove the validity of this method, a small experimental system including an electro-acoustic ultrasonic nebulizer and a gas cyclone was set up. The results show that as the concentration of the ultrasonic vapor increases, the total separation efficiency and the grade efficiency of the uhrafine particles increase significantly. Moreover, the pressure drop of the gas cyclone decreases accordingly.

关 键 词：超细颗粒 电声换能超声波雾化 旋风除尘器 云物理学 分离效率 

分 类 号：X701[环境科学与工程—环境工程]