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Two-stage electrostatic precipitators for the reduction of PM2.5 particle emission

机译：两级静电除尘器，用于减少PM2.5颗粒排放

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Electrostatic precipitator is the most efficient device used for the removal of fly ash particles from the flue gases produced by coal-fired boilers in power plants. However, the fractional collection efficiency of electrostatic precipitators steeply decreases for particles smaller than 1 mu m, and particles in the size range of 200-500 nm are removed with lower collection efficiency than those outside this range. These particles are dangerous to humans and have detrimental environmental effects, so there is a need for novel more efficient technologies for their control. One of the answers to this challenge is the two-stage electrostatic precipitator, in which the electrostatic charging and precipitation processes have been separated. The PM2.5 particles (of a size 2.5 mu m) are electrically charged in a separate device (precharger) to a maximal possible electric charge, and then precipitated in a parallel plate collector, free of corona discharge. The electric field in the collection stage can be higher than in an electrostatic precipitator due to the lack of sharp discharge points. A higher electric field allows an increase of the collection efficiency for PM2.5 particles. Another solution is the agglomeration of submicron particles to form larger particles before their precipitation by a parallel-plate collector, conventional electrostatic precipitator or any other gas cleaning device. In some of the reviewed devices, both of these processes were combined in a single device that allowed further increases in the collection efficiency for submicron particles. Devices of this type have been tested in a labor semi-industrial scale for the removal of PM2.5 particles from flue gases or diesel engine exhausts. In this paper, various constructions of two-stage electrostatic precipitators, comprising a precharger and/or agglomerator in the first stage, and an electrostatic collector in the second stage, have been reviewed. Some of these devices were able to increase the mass collection efficiency above 95% for PM2.5 particles. (C) 2018 Elsevier Ltd. All rights reserved.
机译：静电除尘器是从电厂燃煤锅炉产生的烟道气中去除飞灰颗粒的最有效装置。但是，对于小于1微米的颗粒，静电除尘器的部分收集效率会急剧下降，并且以200-500 nm尺寸范围的颗粒被除去，而其收集效率则低于该范围之外的颗粒。这些颗粒对人类是危险的并且具有有害的环境影响，因此需要用于其控制的新颖更有效的技术。应对这一挑战的方法之一是两级静电除尘器，其中的静电充电和沉淀过程已被分离。 PM2.5颗粒（尺寸小于2.5微米）在单独的设备（预充电器）中充电至最大可能电荷，然后在平行板收集器中沉淀，没有电晕放电。由于缺乏尖锐的放电点，收集阶段的电场可能高于静电除尘器中的电场。较高的电场可以提高PM2.5颗粒的收集效率。另一解决方案是在通过平行板收集器，传统的静电除尘器或任何其他气体清洁装置沉淀之前，亚微米颗粒的团聚形成较大的颗粒。在某些审查过的设备中，这两个过程都组合在一个设备中，这进一步提高了亚微米颗粒的收集效率。这种类型的设备已经在工业半工业规模上进行了测试，可以从烟气或柴油机排气中去除PM2.5颗粒。在本文中，对两级静电除尘器的各种结构进行了综述，包括第一级的预充电器和/或附聚器，第二级的静电除尘器。这些设备中的一些能够将PM2.5颗粒的质量收集效率提高到95％以上。 （C）2018 Elsevier Ltd.保留所有权利。

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