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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Anti-freezing of air-cooled heat exchanger by air flow control of louvers in power plants
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Anti-freezing of air-cooled heat exchanger by air flow control of louvers in power plants

机译：通过控制发电厂百叶窗的风量来防止风冷热交换器的冻结

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Air-cooled heat exchanger will take a serious freezing risk in cold winter, especially at a strong wind speed. Therefore, it is of great concern to study the anti-freezing of natural draft dry cooling system in power plants. In this work, the flow and heat transfer models of cooling air coupling with the circulating water heat transfer are developed and numerically simulated based on the anti-freezing requirement that the outlet water temperature of each sector in the air-cooled heat exchanger remains above 0 degrees C. The air flow control by the louvers for the anti-freezing of air-cooled heat exchanger is investigated, where the louvers are modeled as porous jump faces. The velocity, pressure and temperature fields are presented, and the opening degree of the louvers in each sector, inlet air temperature and mass flow rate of each sector, outlet water temperature of air-cooled heat exchanger, and the turbine back pressure at various wind speeds and ambient temperatures are obtained. The results show that the opening degree adjustment of the louvers can effectively prevent the air-cooled heat exchanger from freezing in cold days, which is beneficial to the safe and economic operation of natural draft dry cooling system in power plants. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在寒冷的冬季，尤其是在强风速下，风冷式换热器将面临严重的冻结风险。因此，研究电厂自然通风干式冷却系统的防冻性能是非常重要的。在这项工作中，基于防冻要求（风冷热交换器中每个扇区的出水温度保持在0以上），开发了与循环水传热耦合的冷却空气的流动和传热模型，并进行了数值模拟。研究了通过百叶窗对风冷热交换器进行防冻的气流控制，其中百叶窗被建模为多孔跳动面。给出了速度，压力和温度场，以及每个扇形区域的百叶窗的开度，每个扇形区域的进气温度和质量流量，风冷热交换器的出水温度以及各种风速下的涡轮背压获得速度和环境温度。结果表明，调节百叶窗的开度可以有效地防止风冷换热器在寒冷天冻结，有利于电厂自然通风干式冷却系统的安全经济运行。 （C）2016 Elsevier Ltd.保留所有权利。

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