Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan, People's Republic of China.
School of Environmental Science and Engineering, Shandong University, Qingdao, Shandong, People's Republic of China.
J Air Waste Manag Assoc. 2021 Nov;71(11):1361-1374. doi: 10.1080/10962247.2021.1939196. Epub 2021 Jul 14.
Along with the increasingly stringent dust emission concentration standards for the thermal power plants and the challenge of market competition, wet electrostatic precipitators (ESPs) have been widely used as terminal equipment for the flue gas treatment. The wet ESPs pilot test platform using the modified carbon steel collectors with hydrophilic properties was established in this paper and the experimental research on PM removal characteristics were carried out. The mechanism of the particles removal efficiency enhancement by water film on the surface of modified collectors was studied. The effect of gas temperature, residence time, working voltage, inlet concentration, and flushing water flowrate on the particles removal efficiency was investigated. The results indicated that the fibrous layer over the surface of the modified collectors could reduce the effect of the airflow recoil and the electromigration resistance of particles. The surface of the modified collectors could also maintain a uniform and stable water film with a lower amount of water consumption. The water film could restrain the back corona and the re-entrainment of dust. And the evaporation of water film increased the humidity of the flue gas, meanwhile, the particles charge capacity and electromigration velocity increased. Those all could improve the particles removal efficiency. The particles removal efficiency increased with the increase of the flue gas residence time and the applied voltage, but the particles removal efficiency improved less with the increase of the particles inlet concentration and flushing water flow rate after maintaining uniform and stable water film. The modified rigid collector provided high removal efficiency for particles with diameters of 0.04～0.48 μm under lower energy and water consumption.: The wet electrostatic precipitators (ESPs) have been widely used as terminal equipment of the flue gas treatment to purify the flue gas deeply. The surface of the modified carbon steel collectors with hydrophilic properties could maintain a uniform and stable water film with a lower amount of water consumption. The evaporation of water film improved the particle charge capacity and electromigration velocity. The wet ESPs using the modified rigid collector exhibited significantly higher removal efficiency of particles than using the conventional rigid collector especially to the particles with diameter of 0.04～0.48 μm.
随着火电厂粉尘排放浓度标准的日益严格和市场竞争的挑战，湿式静电除尘器（ESP）已广泛用作烟气处理的终端设备。本文建立了采用亲水性改性碳钢集尘极的湿式 ESP 中试平台，并对其 PM 去除特性进行了实验研究。研究了表面水膜对改性集尘极颗粒去除效率提高的作用机制，考察了气体温度、停留时间、工作电压、入口浓度和冲洗水流量对颗粒去除效率的影响。结果表明，改性集尘极表面的纤维层可以减少气流回弹和颗粒的电迁移阻力，表面可以保持均匀稳定的水膜，耗水量低。水膜可以抑制反电晕和粉尘再夹带，水膜的蒸发增加了烟道气的湿度，同时增加了颗粒的荷电能力和电迁移速度，从而提高了颗粒去除效率。颗粒去除效率随烟道气停留时间和施加电压的增加而增加，但在保持均匀稳定的水膜后，随着入口颗粒浓度和冲洗水流量的增加，颗粒去除效率的提高幅度较小。改性刚性集尘极在较低的能耗和水耗下，对 0.04-0.48μm 粒径的颗粒具有较高的去除效率。
