以液态铅铋共晶和sCO2为工质的紧凑型换热器传热特性及设计优化

IF 3.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Progress in Nuclear Energy Pub Date : 2025-03-14 DOI:10.1016/j.pnucene.2025.105740

Zhiyuan Luo, Gen Li

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引用次数: 0

摘要

印制电路热交换器（PCHE）是一种潜在的核反应堆中间热交换器（IHXs），具有高效率、高功率密度和在极端条件下的高耐久性等特点。PCHE作为液态铅铋共晶（LBE）反应器的IHX与超临界二氧化碳（sCO2） Brayton循环系统耦合使用，可以提高其紧凑性和安全性。然而，以LBE和sCO2为工质的PCHE热液特性研究较少。本文采用数值方法研究了直、之字形和翼型三种翼型通道中LBE和sCO2的流动和换热特性。结果表明，锯齿形沟道具有较大的努塞尔数（Nu）和摩擦因数(f)，且由于沟道的周期性弯曲结构，沟道沿程波动较大。而稳定的Nu和f在直线型和翼型通道中被观察到。随着进口速度的增大，换热量增大，摩擦损失减小。sCO2入口温度越高，Nu越低，f越高，而入口温度对LBE的影响不明显。在广泛的雷诺数范围内开发了sCO2和LBE的新相关性。通过多目标优化方法和成本分析，对3种通道PCHE的经济可行性进行了比较，结果表明，翼型翼型通道PCHE的年总成本分别比直线和之字形通道PCHE低9.7%和4.7%。

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Heat transfer characteristics and design optimization of compact heat exchanger with liquid lead-bismuth eutectic and sCO2 as working fluids

The Printed Circuit Heat Exchanger (PCHE) is one of the potential intermediate heat exchangers (IHXs) for nuclear reactors characterised by its high efficiency, high power density, and high endurance in extreme conditions. The use of PCHE as an IHX of a liquid lead-bismuth eutectic (LBE) reactor coupled with the supercritical carbon dioxide (sCO₂) Brayton cycle system can enhance its compactness and safety. However, the research on the thermal-hydraulic characteristics of PCHE with LBE and sCO₂ as working fluids is scarce. In this research, the flow and heat transfer of LBE and sCO₂ in straight, zigzag, and airfoil fins channels were studied by numerical method. The results indicated the zigzag channel had a larger Nusselt number (Nu) and friction factor (f) with significant fluctuations along the channel due to the periodic bending structures. While the stable Nu and f were observed in the straight and airfoil fins channels. As the inlet velocity rose, the heat transfer increased while the friction loss decreased. The larger inlet temperature of sCO₂ resulted in lower Nu and higher f, while the inlet temperature had an unobvious impact on LBE. New correlations of sCO₂ and LBE were developed across an extensive range of Reynolds number. Moreover, the economic viability of three channel PCHEs was compared by multi-objective optimization method and cost analysis, revealing that the annual total cost of the airfoil fins channel PCHE was 9.7% and 4.7% lower than that of the straight and zigzag, respectively.

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来源期刊

Progress in Nuclear Energy 工程技术-核科学技术

CiteScore

5.30

自引率

14.80%

发文量

331

审稿时长

3.5 months

期刊介绍： Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field. Please note the following: 1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy. 2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc. 3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.