Two-stage-type electrostatic precipitator re-entrainment phenomena under diesel flue gases
Two-stage-type electrostatic precipitator re-entrainment phenomena under diesel flue gases
复制标题
两级式电除尘器柴油烟气的再夹带现象
DOI：
10.1109/28.753627
复制
发表时间：
1999
影响因子：
4.4
通讯作者：
T. Takamatsu
中科院分区：
文献类型：
--
作者：
A. Zukeran;Yasushi Ikeda;Y. Ehara;M. Matsuyama;T. Ito;Takeo Takahashi;H. Kawakami;T. Takamatsu
静电除尘器的应用之一是净化隧道内的空气，提高隧道内的能见度。公路隧道空气中漂浮的颗粒物主要是碳。当ESP收集具有低电阻的碳颗粒时，ESP中的大颗粒直径的收集效率经常降低。在实验的电除尘器中，除尘效率常常变为负值，负除尘效率是指电除尘器中下游的颗粒浓度大于上游的颗粒浓度，这种现象被解释为颗粒的二次夹带。本文通过实验研究了电除尘器颗粒收集效率下降的原因，研究了收集效率的时间特性和收集电极上颗粒粒径的分布。实验结果表明，在电除尘器运行过程中，除尘效率的下降是由颗粒的二次夹带造成的。研究了气流速度对电除尘器捕集效率的影响，探讨了二次卷吸现象产生的原因。结果表明，二次夹带现象与气流速度有关。
One of the applications of the electrostatic precipitator (ESP) is the cleaning of air to increase the visibility index in highway tunnels. Particles floating in air in highway tunnels are mainly carbon. Collection efficiency of a large particle diameter in an ESP often decreases when the ESP collects carbon particles which have low electric resistance. Collection efficiency often becomes negative in an experimental ESP. The negative collection efficiency means that the particle concentration flowing downstream is greater than that upstream in the ESP. This phenomenon is explained as the re-entrainment of particles. In this paper, experiments were carried out to investigate the cause of the decrease in efficiency of particle collection of the ESP. The time characteristic of the collection efficiency and the distribution of particle size on the collection electrodes were studied. Experimental results showed that the decrease in the collection efficiency was caused by re-entrainment of particles during the ESP operation. The effect of gas-flow velocity on the collection efficiency of the ESP was also investigated to study the cause of re-entrainment phenomena. The result showed that the re-entrainment phenomena depended on the gas-flow velocity.