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Analyiss on Dicharge Environment and the Effect of of Dust Electrostatic Coagualation

Author: SunXiaoRong
Tutor: LiQing
School: Hebei University
Course: Environmental Engineering
Keywords: Dry corona discharge cavity-type spray electrode Spray coagulation technology fine dust collection efficiency
CLC: X701.2
Type: Master's thesis
Year: 2011
Downloads: 5
Quote: 0
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Abstract


In recent years, Electrostatic dust removal technology has been developing rapidly due to the high efficiency, However, practical studies have shown that, the overall collection efficiency of electrostatic precipitator can be up to 99%, but the collection efficiency of PM2.5 is still at a relatively low state. For the above, the concept of atomization corona discharge applied to dust removal is proposed in this paper, The dry corona discharge and atomization corona discharge are analyzed comparatively, including the state of charge and coagulation of dust particles and the changes of characteristics in electric space. The collection efficiency of PM2.5 can be improved by the spray coagulation technology is further confirmed. The result broadens the idea of promoting the development of electrostatic dust removal technology.In the process of experimental studying, the structure of cavity-type atomizing electrode contact ionization is adopted firstly, focusing on the comparison of spray discharge and dry discharge. The feasibility that spray discharge applied to dust removal and the influence of various factors are analyzed. The results show that,1. The discharge current of atomization corona discharge can be increased for its efficient mechanism. This ensures that the charge and coagulation efficiency of fine dust particles can be improved in the latter experiment. The same time, the relationship between the discharge characteristics and concentration of spray solution and the diameter of atomization electrode is also studied, the results show that, the concentration and diameter changes within a certain range with minimal impact on the discharge characteristics. So the practical value of the atomization device is greatly enhanced.2. Compared with the traditional electrostatic dust removal technology, the capture efficiency of PM2.5 is improved with varying degrees by spray coagulation technology. Particularly the fine dust particles of 0.1-0.6 has the substantial increase in collection efficiency, and the collection efficiency of 0.4 dust particle is up to the peak.3. In the spray discharge environment, increasing the voltage to some extent, the coagulation efficiency of small size particles can be improved. But the relationship between capture efficiency and the voltage is non-positive corresponding. The best input voltage is different in different experimental conditions, need to be adjusted according to actual situation.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization > Smoke and dust
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