【作者】 孙晓荣；

【导师】 李庆；

【作者基本信息】 河北大学 ， 环境工程， 2011， 硕士

【摘要】 近年来,静电除尘技术以其高效率得到了迅速发展,但实践研究表明,静电除尘技术总体除尘效率可高达99%,但对微细粉尘PM2.5的捕集效率仍处于相对较低的状态。针对以上情况,本文提出了将雾化电晕放电应用于除尘领域的构想,并将干式电晕放电与雾化电晕放电两种不同放电环境下粉尘颗粒的荷电、凝并状态以及电场空间的特性变化进行了对比性的实验分析,进而证实了雾化电凝并技术能够提高微细粉尘PM2.5的捕集效率,该结果为推动静电除尘技术的发展拓宽了思路。本文在实验研究过程中,首次采用空腔式雾化电极接触电离的结构形式,着重将雾化放电与干式放电进行了对比,并对雾化放电应用于除尘领域的可行性及各个影响因素进行了分析研究,结果表明：1.雾化电晕放电以其高效的荷电机制能够使放电电流增大,这就保证了后期的凝并实验中微细粉尘粒子荷电、凝并效率的提高,同时对雾化溶液浓度及雾化电极直径与放电特性之间的关系进行了研究,得出溶液浓度及雾化直径在一定范围内的变化对放电特性的影响微乎其微,大大提升了雾化凝并装置的可实用性。2.相对于传统的静电除尘技术,雾化电凝并技术使得PM2.5的捕集效率得到了不同程度的提高,特别是0.1-0.6μm范围内的微细粉尘颗粒捕集效率大幅提高,0.4μm的粉尘粒子捕集效率达到峰值。3.对比实验结果显示,在雾化放电环境下,一定程度的提高电压能够提高小粒径颗粒的凝并捕集效率,但捕集效率的提高与电压的提高非正对应关系,不同的实验条件最佳的输入电压不同,需根据实际情况进行调整。更多还原

【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.更多还原