电力科技与环保2025，Vol.41Issue(4)：601-610,10.DOI:10.19944/j.eptep.1674-8069.2025.04.008
燃煤机组空冷单元喷雾增湿系统优化设计研究
Research on optimization design of spray humidification system for air cooling unit of coal-fired unit
摘要
Abstract
[Objective]Spray humidification and cooling technology is an effective means of heat transfer enhancement.In order to effectively improve the heat dissipation performance of the air cooling unit of coal-fired units,alleviate the heat dissipation pressure of the unit under high temperature conditions in summer,reduce the energy consumption of the unit and improve the operation economy,the optimization design of spray humidification system was carried out.[Methods]In this paper,the air cooling unit of a 600 MW direct air-cooled coal-fired unit is taken as the research object.Based on the discrete phase model,a numerical model of the spray evaporation heat transfer process of the nozzle is established,and the nozzle parameters(number,lateral distance,height,pressure and injection angle)are optimized.The influence of different ambient temperature,fan air volume and water injection volume on the heat dissipation performance of the system is investigated by variable condition analysis.[Results]The results show that the optimal number of nozzles is 12,and the overall heat dissipation is 12.430 MW.The best transverse distance is 0.64 m from the central axis of the nozzle,and the overall heat dissipation is 12.348 MW.As the nozzle height increases,the average inlet temperature of the radiator surface gradually increases,and the overall heat dissipation gradually decreases.When the nozzle pressure is 3 MPa,the average inlet temperature of the heat exchanger reaches the lowest value of 317.940 K,and the overall heat dissipation reaches the maximum value of 13.35 MW.As the injection angle increases,the overall heat dissipation gradually increases.When the injection angle is 45°,the overall heat dissipation is 12.348 MW.With the increase of ambient temperature,the overall heat dissipation gradually decreases with or without water spraying.When the ambient temperature is 300.15 K,the overall heat dissipation without water spraying is 13.05 MW,and the overall heat dissipation with water spraying is 13.80 MW.With the increase of the rated flow ratio of the fan,the overall heat dissipation gradually increases.When the rated flow ratio of the fan is 107.5%,the overall heat dissipation is 12.30 MW;With the increase of water spray volume,the overall heat dissipation gradually increases,but the increase gradually decreases.When the water spray volume is 0.24 kg/s,the overall heat dissipation is 12.182 MW.When the water spray volume is 1.20 kg/s,the overall heat dissipation is 12.369 MW.The water spray volume is reasonably determined according to the actual situation.[Conclusion]Spray humidification and cooling technology can effectively improve the heat transfer capacity of air cooling unit of coal-fired units in summer.This study can provide a theoretical basis for the design and operation of spray humidification system of air cooling unit of coal-fired units.关键词
空冷机组/喷雾增湿/优化设计/换热强化/数值模拟Key words
air-cooled unit/spray humidification/optimized design/heat transfer enhancement/numerical simulation分类
能源科技引用本文复制引用
陈阳,王东,张鑫,石琳,史鹏飞,张华锋..燃煤机组空冷单元喷雾增湿系统优化设计研究[J].电力科技与环保,2025,41(4):601-610,10.基金项目
国家能源集团科学技术研究院有限公司科技项目(TY2024Y01) （TY2024Y01）
