Study on Atomization Characteristics of Nozzles in Wet Electrostatic Precipitator

• Published in: IOP conference series. Materials Science and Engineering Vol. 538; no. 1; pp. 12038 - 12043
• Main Authors: Xiao, Lichun, Wang, Xin, Wei, Yongpeng, Zhang, Meng, Wang, Yuchuan
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.05.2019
• Subjects: Atomizing; Coal-fired power plants; Droplets; Dust control; Efficiency; Electrostatic precipitators; Flow velocity; Fly ash; Nozzles; Precipitators; Spraying; Water flow; Water pressure
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/538/1/012038

Wet electrostatic precipitator (ESP) has been paid more and more attention because of its good collection effect on fine particles in coal-fired power plants. Spraying system is an important part of the wet ESP and its atomization characteristics has an important influence on the collection efficiency. The atomization performance of solid and hollow nozzles was tested under varying pressure. The dust collection efficiency of wet ESP affected by atomization parameters and corona discharge characteristics were studied. Dust removal experiments were carried out by using fly ash from coal-fired power plants. Results show that the best working water pressure of ESP is 0.6 MPa and the atomization effect is best at the same time. Under the same conditions, the dust collection efficiency increased with the decrease of droplets' diameter and the increase of spray water flow rate. When the droplets' size is 70 μm, the dust collection efficiency can reach 99.57%, which can meet the high efficiency of fine particles removal in coal-fired power plants.