摘要
【目的】变流量全塔配水时,配水均匀性对湿冷塔冷却性能影响较大。为实现湿冷机组在深度调峰全过程湿冷塔高效节能运行,研究了湿冷塔变流量对全塔配水均匀性及冷却性能的影响,并进行了配水优化。【方法】基于湿冷塔配水理论计算模型和三维热力计算模型,研究了循环水双泵和单泵运行全塔配水时循环水量、水量分配及其不均匀性的变化特征,分析了变流量配水对冷却塔水池表面水温和平均水温的影响,并提出了配水优化方案。【结果】由双泵切换至单泵运行时,仅考虑双泵运行配水优化的方案内区配水不均匀性系数由3.8%提高至6.8%,外区部分配水管末端出现零喷淋现象,由此造成单泵运行全塔配水时外区冷却性能弱化。结合循环水泵变工况运行时流量变化,提出了综合单双泵运行的全塔配水优化方案,可实现单泵运行时平均出塔水温降低0.8℃。【结论】综合考虑湿冷塔变流量配水时全塔配水均匀性的优化设计方案,可实现湿冷机组深度调峰全工况冷端的高效节能运行。
[Objectives]When distributing water across the whole tower under different water flow rates,the water distribution uniformity has a significant effect on the cooling performance of wet cooling tower.In order to realize the high efficiency and energy-saving operation of wet cooling tower in the whole process of deep peak-shaving of wet cooling power units,the influence of the variable flow rate of the wet cooling tower on the water distribution uniformity and cooling performance of the whole tower is studied,and the water distribution optimization is carried out.[Methods]Based on the theoretical calculation model for water distribution in wet cooling tower and the three-dimensional thermal calculation model,the variation characteristics of water mass flow rate,water distribution and its non-uniformity during whole-tower water distribution under single-pump and dualpump operation are studied.The influence of variable flow water distribution on the surface water temperature and average water temperature of cooling tower pool is analyzed,and the optimization scheme of water distribution is put forward.[Results]When switching from dual-pump to single-pump operation,the non-uniformity coefficient of water distribution in the inner zone is increased from 3.8%to 6.8%under the scheme only considering the optimization of water distribution in dual-pump operation,and zero spray phenomenon occurs at the end of some water distribution pipes in the outer zone,which weakens the cooling performance of the outer zone when the water distribution of the whole tower is operated by single-pump.Combined with the flow change of circulating water pump under variable operating conditions,an optimization scheme of water distribution in the whole tower integrating single-pump and dual-pump operation is proposed,which can reduce the average outlet water temperature by 0.8℃ under the singlepump operation.[Conclusions]Considering the optimization design of the water distribution uniformity of the whole tower during the variable flow water distribution of the wet cooling tower,the high efficiency and energy-saving operation of the cold end of the wet cooling units under the full working condition of the deep peak-shaving can be realized.
作者
罗晟
王磊
李杨
孟庆明
张贵彬
赵元宾
LUO Cheng;WANG Lei;LI Yang;MENG Qingming;ZHANG Guibin;ZHAO Yuanbin(China Energy Baoqing Coal Power&Chemical Company Limited,Shuangyashan 155600,Heilongjiang Province,China;China Grid Energy Hami Coal Power Company Limited,Hami 839000,Xinjiang Uygur Autonomous Region,China;School of Nuclear Science,Energy and Power Engineering,Shandong University,Jinan 250061,Shandong Province,China)
出处
《发电技术》
2025年第5期1041-1049,共9页
Power Generation Technology
基金
山东省科技厅科技型中小企业创新能力提升工程项目(2022TSGC1026)。
关键词
火力发电
冷却塔
变流量配水
配水均匀性
配水优化
冷却性能
深度调峰
节能
thermal power generation
cooling tower
variable flow rate water distribution
water distribution uniformity
water distribution optimization
cooling performance
deep peak-shaving
energy-saving
