Effect of deflector angle and number on evaporation performance of desulfurization wastewater in a spray drying tower

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 116; pp. 581 - 594
• Main Authors: Jia, Shaodan, Ma, Lun, Chen, Xinke, Fang, Qingyan, Zhang, Cheng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.12.2022
• Subjects: Deflector structure; Desulfurization wastewater; Evaporation performance; Numerical simulation; Spray drying tower; Spray drying tower; Numerical simulation; Deflector structure; Desulfurization wastewater; Evaporation performance
• ISSN: 1226-086X
• DOI: 10.1016/j.jiec.2022.09.048

[Display omitted] •Spray drying technology with bypass flue treats desulfurization wastewater.•Effect of deflector angle and number on evaporation performance was simulated.•Internal deflector angle has a more obvious effect than external deflector angle.•Deflector number has relatively weak effect on evaporation performance.•Proper deflector angle and number are successfully applied with good performance. Rotary spray drying technology with bypass flue is widely adopted to realize the zero-discharge of desulfurization wastewater in coal-fired power stations. Significantly, the deflector structure of the drying tower is an essential factor affecting the evaporation performance of desulfurization wastewater. This paper is aimed to study the effect of the angle and number of the deflectors on the evaporation performance in a drying tower of a 600 MW coal-fired station. Results show that the gas distributor divides the flue gas into internal and external parts, and the flue gas in the internal channel is the main factor affecting the evaporation performance. The deflector angles (especially for the internal deflector) have a remarkable impact on the evaporation behaviors, while the deflector numbers just have a minor effect on that. When the deflector number is 24 and the angles of internal and external deflectors are set at 0° and 45°, respectively, a better evaporation performance is obtained with the weighted average time of approximately 0.17 s and the complete evaporation distance of approximately 3.93 m. These optimal settings are adopted in the actual operation, and the industrial measured results show good performance is obtained.