应用电声换能超声波雾化方法提高超细颗粒捕集效率

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.

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

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 nebulizer is charged into the dusty gas. According to the "cloud physics" and collision theory, the saturated water vapor 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 ultrafine particles increase significantly. Moreover, the pressure drop of the gas cyclone decreases accordingly.