Development of Wet Type Electrostatic Precipitator Using a Mist Formation

近年来，燃煤作为电站能源的使用量不断增加。如何在严格的环保法规下减少大气中的飞灰是燃煤的问题之一。本研究开发了一种新的湿式电除尘方法，以收集半径为亚微米的小颗粒。而且效率很高。该方法的基本原理是，颗粒周围形成不均匀的雾，使颗粒周围的电场力因半径的增大而增大。通过实验和理论研究，得出以下结论：1.阐明了平行平板间强迫对流和电晕电场作用下，灰尘颗粒的雾化机理及其输运过程。捕集颗粒的效率与设备的结构、基于流速的雷诺数、基于电压的EHD雷诺数以及由温度和湿度确定的无量纲参数&lt；T^*&gt；有关。得到了与设备配置有关的最佳操作条件。

In recent years, the use of coal has been increasing as an energy source for power station. One of the problems burnimg coal is how to decrease the flyash in the atmosphere under the strict environmental regulation. In this research, a newly method of wet type electrostatic precipitation was developed so as to collect the small particles, which have sub-micron radius. with high efficiency. This method is based on the principle that heterogeneous mist formation around the particles results in enlargement of electric force due to increase of radius. According to the experimental and theoretical studies, the following results were obtained:1. The mechanism of mist formation of ash particles and their transport process were clarified under the forced convective and corona-electric fields between parallel plates.2. The efficiency of collenting particles was related with the configuration of equipments, Reynolds number based on the flow velocity, EHD Reynolds number based on the voltage, and dimensionless parameter <T^*> determined by temperature and humidity.3. The optimum operating conditions were obtained in relation with configuration of equipments.