摘要
为准确揭示间接空冷散热器管束防冻机理,指导间冷电站冬季的防冻高效运行,该文以电站空冷散热器管束为研究对象,基于循环水和冷却空气能量守恒及空冷散热器传热方程,利用MATLAB平台建立管束防冻预测模型,求解获得不同操作参数和气水流程下管内循环水温度分布规律和临界防冻特性。结果表明:对于交叉顺流管束,在背风侧管束内水会出现“反吸热”现象,潜在冻结位置出现在背风侧第一排管中部或出口区域。对于交叉逆流管束,临界冻结位置仅出现在迎风侧第一排管或第二排管的出口。相同条件下,四排管逆流管束最易发生冻结危险,而六排管顺流管束具有更好的防冻特性。研究结果为电站空冷系统高效运行和防冻预测提供理论依据,所开发的数学模型也可应用于空调制冷、太阳能等领域多管排换热器的传热特性预测和调控。
In order to reveal the anti-freezing mechanism of the air-cooled heat exchanger and then guide the energy-efficient anti-freezing operation of the indirect dry cooling power plant, the anti-freezing predicting model was developed through MATLAB platform in this paper following the energy equations and heat transfer equation of circulating water and cooling air. The water temperature distribution and critical freezing characteristics of air-cooled heat exchanger were disclosed and analyzed, under various working conditions and water/air flow patterns. The results show that, for air-cooled heat exchanger with the co-current cross flow pattern, the potential freezing position happens at the middle or outlet of the first row of the leeward side due to the reverse heating from cooling air to circulating water;for air-cooled heat exchanger with the counter-current cross flow pattern, the potential freezing position appears at the outlet of the first or second row of the windward side. Under the same working condition, the air-cooled heat exchanger with the four-row counter-current cross flow pattern has the most freezing risk,while the air-cooled heat exchanger with the six-row co-current cross flow pattern presents the best anti-freezing capability.This research could provide some theoretical supports for the energy-saving and anti-freezing operation of dry-cooling power Plant;meanwhile the established mathematical model could also be applied to the heat transfer prediction and controlling for air conditioning, refrigeration and solar power station.
作者
王伟佳
孔艳强
温新宇
李安生
杨立军
杜小泽
WANG Weijia;KONG Yanqiang;WEN Xinyu;LI Ansheng;YANG Lijun;DU Xiaoze(Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education(School of Energy Power and Mechanical Engineering,North China Electric Power University),Changping District,Beijing 102206,China;Chn Energy New Energy Technology Research Institute Co.,Ltd.,Changping District,Beijing 102209,China;China Electric Power Equipment and Technology Co.,Ltd.,Xicheng District,Beijing 100052,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第17期6357-6367,共11页
Proceedings of the CSEE
基金
国家自然科学基金项目(52006065)。
关键词
间接空冷系统
空冷散热器
翅片管束
防冻预测
温度分布
natural draft dry cooling system
air-cooled heat exchanger
finned tube bundles
anti-freezing prediction
temperature distribution
