摘要
逆流式自然通风冷却塔易受环境风影响,引起性能恶化。本文基于行业相关标准,对某现役发电厂用自然通风湿式逆流塔的进出口参数进行实塔测试。此次测试对冷却塔的进出塔参数进行了全面的监测,包括进塔空气干湿球温度、进塔水温、出塔气温、出塔水温、填料上下温度等;通过对冷却塔测试数据的整理,分析了冷却塔的通风及热力性能,重点分析了夏季工况下冷却塔的运行特性;并对比分析了导风板、导风管以及采用填料非均匀布置等优化措施对冷却塔通风及热力性能的影响。结果表明:侧风存在影响周向进风,导致冷却塔除水器上方温度不均;通过安装导风板、导风管、填料非均匀布置等改造措施,可使冷却塔性能改善。以夏季双泵高速流量工况为例,当风速达3.2 m/s时,进风均匀性提高36.7%,除水器上方温度均匀性提高10.5%;风速接近4 m/s时,冷却性能提高8.7%。本文对于同类电厂冷却塔的结构改善具有一定的参考价值。
Counter flow natural ventilation cooling towers are susceptible to environmental winds,resulting in performance deterioration.Based on the relevant industry standards,this paper conducted a real tower test on the inlet and outlet parameters of a natural ventilation wet counterflow tower for an active power plant.It carried out a comprehensive monitoring of the cooling tower’s inlet and outlet parameters,including the dry and wet bulb temperature of the air at tower inlet,water temperature at tower inlet,air temperature at tower outlet,water temperature at tower outlet and the temperature above and under the packing.Through collation of the cooling tower test data,the ventilation and thermal performance of the cooling tower was analyzed,and characteristics of the cooling tower in summer were analyzed specially.Moreover,the effects of optimization measures such as air deflectors,air ducts,and non-uniform arrangement of packing on the cooling tower ventilation and thermal performance were compared and analyzed.The results show that,the presence of cross wind affected the circumferential air entrance,resulting in uneven temperature above the water separator for cooling tower.The performance of the cooling tower can be improved by installing air deflectors,air ducts,and non-uniform arrangement of packing.Taking the high-speed flow condition with double-pump in summer as an example,when the wind speed reached 3.2 m/s,the uniformity of the inlet air increased by 36.7%,and the temperature uniformity above the water separator increased by 10.5%.When the wind speed was close to 4 m/s,the cooling performance improved by 8.7%.The result has certain reference value for structural improvement of cooling towers in similar power plants.
作者
唐磊
刘严雪
何锁盈
高明
岳玉金
刘自力
孙奉仲
TANG Lei;LIU Yanxue;HE Suoying;GAO Ming;YUE Yujin;LIU Zili;SUN Fengzhong(Hunan Electric Power Design Institute,China Energy Engineering Group Co.,Ltd.,Changsha 410007,China;School of Energy and Power Engineering,Shandong University,Jinan 250061,China)
出处
《热力发电》
CAS
北大核心
2020年第6期144-151,共8页
Thermal Power Generation
基金
山东大学青年学者未来计划(2018WLJH73)
山东省自然科学基金青年基金(ZR2017QEE010)。
关键词
逆流式冷却塔
环境侧风
热力性能
实塔测试
性能改造
counter flow cooling tower
ambient cross wind
thermal performance
real tower test
performance retrofitting
