摘要
通过建立2×600 MW直接空冷电厂的数值模型,采用Fluent软件计算得到了环境风速影响下空冷凝汽器风机的运行规律,并通过加载翅片管换热器内部汽轮机排汽的凝结程序,分析了环境风速对空冷凝汽器换热量的影响机理.计算结果表明:在环境风速的扰动作用下,环境风速由0 m/s上升至12 m/s时空冷凝汽器周围的流场变化使凝汽器总容积效率下降了15.9%,迎风面风机的容积效率下降幅度更是高达43.6%,而空冷凝汽器的换热量也相应地从1 695.2 MW下降至1 418.6 MW.通过分析获得了环境风速对空冷凝汽器运行性能的影响机理,可为空冷电厂运行背压的预测提供参考.
A numerical model for a 2×600 MW air-cooled power plant was established and the commercial code,FLUENT,was applied to obtain the operation patterns of the air-cooled fans at different wind speeds.The influence of the wind speed on the heat transfer rate was also analyzed using the program for condensation of the exhaust steam in the finned tube exchangers.The result shows that the total volume effectiveness of the air-cooled condenser decreases by 15.9% due to the difference of the flow field around the condenser and the volume effectiveness of the windward fans decreases by up to 43.6% when the wind speed increases from 0 m/s to 12 m/s,leading to the decrease in the heat transfer rate of the heat exchangers from 1 695 MW to 1 418.6 MW.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2011年第5期31-35,共5页
Journal of Xi'an Jiaotong University
关键词
数值模型
环境风速
空冷凝汽器
容积效率
换热量
numerical model
wind speed
air-cooled condenser
volume effectiveness
heat transfer rate
