细颗粒物电凝并技术研究进展

Development of Fine Particulate Matter Electrical Agglomeration Technology

雾霾的主要污染物是细颗粒物PM2.5,主要来自燃煤过程,传统除尘技术对PM2.5的捕获效率较低,通过电凝并技术使PM2.5凝聚成大颗粒,再通过传统除尘器脱除,可提高PM2.5的捕集效率。综述了国内外电凝并技术的研究进展,主要包括静电场中异极性荷电颗粒凝并、交变电场中同极性荷电颗粒凝并、交变电场中异极性荷电颗粒凝并;介绍了一种新型荷电凝并装置,细颗粒物与大颗粒之间运动与凝并的直接观测实验,为电凝并技术的实际应用和装备开发提供技术支撑。

Fine particulate matter （PM 2.5） is the key pollutant of haze, which is mainly emitted from coal-fired process. But the PM2.5 capture efficiency of traditional particulate collectors is not high enough. The electric agglomeration technology can induce the charged PM2.5 to coagulate as larger particles, which can be easily removed in the traditional particulate collectors. This paper mainly introduces the latest progress of the agglomeration technology at home and abroad, including particulate agglomeration with different charges in an electrostatic field, particulate agglomeration with same charges in an alternative-electrostatic field, particulate agglomeration with different charges in an alternative-electrostatic field, the new coagulating apparatus, and the microscopic visualization of agglomeration to a large particulate, which provides technical support for the industrial application of the electric agglomeration technology.