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Hybrid electrostatic filtration systems for fly ash particles emission control. A review
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2018-12-07 , DOI: 10.1016/j.seppur.2018.12.011
A. Jaworek , A.T. Sobczyk , A. Krupa , A. Marchewicz , T. Czech , L. Śliwiński

The removal of submicron and nanoparticles from flue gases emitted by coal fired boilers is the subject of extensive studies in recent years. Electrostatic precipitators and fibrous filters are the most commonly used gas-cleaning devices for the removal of these particles in power plants and industry. However, the collection efficiency of electrostatic precipitators decreases for particles smaller than 1 µm. Fibrous filters provide higher filtration efficiency for particles of this size, but the pressure drop is higher, and additional energy is needed to supply the outlet fan. Recently, special attention of engineers has been given to hybrid constructions, which apply electrostatic fields and forces in order to improve the performances of bag filters. There are three types of such solutions, which have been investigated in the literature: (1) electrically energized filter, in which fibres of the filter are energized by an electric field; (2) hybrid electrostatic filter, which applies electrostatic charging of particles before their filtration by bag filter; and (3) hybrid electrostatic precipitator, which uses a conventional electrostatic precipitator for the removal of coarse particles, and a subsequent bag filter for the removal of fine particles leaving the precipitator. All of these constructions allow the collection efficiency for PM2.5 particles to be increased and the pressure drop across the bag filter to be reduced. In this paper, various hybrid electrostatic filtration systems have been reviewed and their performances compared with respect to the collection efficiency, pressure drop and dust cake dislodging.



中文翻译:

用于粉煤灰颗粒排放控制的混合静电过滤系统。回顾

近年来,从燃煤锅炉排放的烟气中去除亚微米和纳米颗粒是广泛研究的主题。静电除尘器和纤维过滤器是电厂和工业中用于去除这些颗粒的最常用的气体清洁设备。但是,对于小于1 µm的颗粒,静电除尘器的收集效率会降低。纤维过滤器可为这种尺寸的颗粒提供更高的过滤效率,但压降更高,并且需要额外的能量来供应出口风扇。最近,工程师对混合结构给予了特别的关注,该混合结构施加静电场和力以改善袋式过滤器的性能。此类解决方案有三种类型,已在文献中进行了研究:(1)电激励滤波器,其中滤波器的纤维被电场激励;(2)混合式静电过滤器,在通过袋式过滤器过滤之前,对颗粒施加静电。(3)混合式静电除尘器,其使用常规的静电除尘器去除粗颗粒,以及随后的袋式除尘器用于去除离开除尘器的细小颗粒。所有这些构造都可以提高PM2.5颗粒的收集效率,并减少袋式除尘器上的压降。本文对各种混合式静电过滤系统进行了综述,并比较了其在收集效率,压降和滤饼脱落方面的性能。过滤器的纤维通过电场激励;(2)混合式静电过滤器,在通过袋式过滤器过滤之前,对颗粒施加静电。(3)混合式静电除尘器,其使用常规的静电除尘器去除粗颗粒,随后使用袋式除尘器去除从除尘器出来的细小颗粒。所有这些构造都可以提高PM2.5颗粒的收集效率,并减少袋式除尘器上的压降。本文对各种混合式静电过滤系统进行了综述,并比较了其在收集效率,压降和滤饼脱落方面的性能。过滤器的纤维通过电场激励;(2)混合式静电过滤器,在通过袋式过滤器过滤之前,对颗粒施加静电。(3)混合式静电除尘器,其使用常规的静电除尘器去除粗颗粒,随后使用袋式除尘器去除从除尘器出来的细小颗粒。所有这些构造都可以提高PM2.5颗粒的收集效率,并减少袋式除尘器上的压降。本文对各种混合式静电过滤系统进行了综述,并比较了其在收集效率,压降和滤饼脱落方面的性能。在通过袋式除尘器过滤之前对颗粒施加静电电荷;(3)混合式静电除尘器,其使用常规的静电除尘器去除粗颗粒,随后使用袋式除尘器去除从除尘器出来的细小颗粒。所有这些构造都可以提高PM2.5颗粒的收集效率,并减少袋式除尘器上的压降。本文对各种混合式静电过滤系统进行了综述,并比较了其在收集效率,压降和滤饼脱落方面的性能。在通过袋式除尘器过滤之前对颗粒施加静电电荷;(3)混合式静电除尘器,其使用常规的静电除尘器去除粗颗粒,随后使用袋式除尘器去除从除尘器出来的细小颗粒。所有这些构造都可以提高PM2.5颗粒的收集效率,并减少袋式除尘器上的压降。本文对各种混合式静电过滤系统进行了综述,并比较了其在收集效率,压降和滤饼脱落方面的性能。以及随后的布袋除尘器,用于去除从沉淀器中排出的细小颗粒。所有这些构造都可以提高PM2.5颗粒的收集效率,并减少袋式除尘器上的压降。本文对各种混合式静电过滤系统进行了综述,并比较了其在收集效率,压降和滤饼脱落方面的性能。以及随后的布袋除尘器,用于去除从除尘器中排出的细小颗粒。所有这些构造都可以提高PM2.5颗粒的收集效率,并减少袋式除尘器上的压降。本文对各种混合式静电过滤系统进行了综述,并比较了其在收集效率,压降和滤饼脱落方面的性能。

更新日期:2018-12-07
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