Development of Wet Type Electrostatic Precipitator Using a Mist Formation

近年来，煤作为发电站的能源的使用一直在增加。如何在严格的环保法规下减少大气中的飞灰是燃煤面临的问题之一。本研究发展了一种新型的湿式静电除尘方法，以收集亚微米级的微小颗粒。具有高效率。该方法是基于粒子周围形成的非均匀雾状物由于半径的增加而导致电力增大的原理。通过实验和理论研究，得到了以下结果：1.阐明了在平行板强制对流场和电晕电场作用下灰粒雾的形成机理和输运过程.颗粒的分选效率与设备的结构、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决定的无量纲参数<T^*>有关.并结合设备配置，确定了最佳操作条件。

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.