A numerical investigation of the effect of dust layer on particle migration in an electrostatic precipitator

摘要: ABSTRACT Electrostatic precipitation processes have been widely applied to remove particulate matter from flue gases in coal-fired power stations. A high negative voltage is usually a discharge electrode so that the are ionized such processes. When suspended particles enter space, they electrically charged and deposited on collection plates form layer of particle packing. However, dust generally exists during plate. The effect precipitated plate causes efficiency electrostatic precipitator (ESP) deteriorate seriously due some critical factors, as resistivity thickness accumulated dust. In this study, simulation method by computational fluid dynamics was investigate performance ESP system with without layer. Also, detailed electric parameters capture 2D wire-plate configuration were simulated. results show voltage-current characteristics distribution field ion charge density completely different under various conditions. significant, which decrease sharply increasing (1–5 mm) Furthermore, indicate when higher ESP, their migration velocity decreases sharply. case 80 kV, 1012 Ω·cm, decline rate reaches 57.7%. Meanwhile, useful suggestions provided reduce effects layers regulating properties designing removal systems.