储能科学与技术 ›› 2022, Vol. 11 ›› Issue (6): 1988-1995.doi: 10.19799/j.cnki.2095-4239.2022.0020

• 化工与储能专刊 • 上一篇    下一篇

列管式固体氯化钠蓄冷换热器动态分布参数分析

吴玉庭(), 寇真峰, 张灿灿, 吴伊洋   

  1. 北京工业大学环境与生命学部，传热强化与过程节能教育部重点实验室及传热与 能源利用北京市重点实验室，北京 100124
  • 收稿日期:2022-01-12 修回日期:2022-02-24 出版日期:2022-06-05 发布日期:2022-06-13
  • 通讯作者: 吴玉庭 E-mail:wuyuting@bjut.edu.cn
  • 作者简介:吴玉庭（1970—），男，博士生导师，主要研究方向为高温高热流传热蓄热、低品位能源高效热功转换、先进制冷技术，E-mail：wuyuting@bjut.edu.cn。
  • 基金资助:
    内蒙古科技计划项目(2021GG0253)

Analysis of the dynamic distribution parameters of a solid sodium chloride column heat exchanger

WU Yuting(), KOU Zhenfeng, ZHANG Cancan, WU Yiyang   

  1. MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Beijing Key Laboratory of Heat Transfer and Energy Conversion, Beijing University of Technology, Beijing 100124, China
  • Received:2022-01-12 Revised:2022-02-24 Online:2022-06-05 Published:2022-06-13
  • Contact: WU Yuting E-mail:wuyuting@bjut.edu.cn

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摘要：

为研究列管式固体氯化钠蓄冷换热器在超临界压缩空气储能系统中的工作性能，将整个蓄冷换热器等效为所有单根换热管的并联，对单根换热管以及管外氯化钠划分微元，对每个微元列出控制方程，根据实际运行时蓄冷换热器在蓄冷、保冷、释冷过程不同的输入参数进行离散求解，最终得到了在蓄冷、保冷及释冷过程中蓄冷换热器不同时刻空气温度分布、氯化钠温度分布、出口质量流量、散热量、局部换热系数、局部换热量等参数。结果发现，空气出口质量流量发生波动，蓄冷时小于进口流量，释冷时大于进口流量；空气在管内进行跨临界流动换热时，在空气温度达到准临界温度时换热系数最大，且由于在准临界温度附近空气比热容先增大后减小，空气温度上升速率先减小后增大；氯化钠初始温度分布的不同导致保冷结束后换热器各位置氯化钠温度变化不同。本文研究揭示了超临界空气在列管式固体氯化钠蓄冷换热器内的流动传热规律，为间接式蓄冷换热器在超临界空气储能中的应用提供了理论基础。

关键词: 超临界压缩空气储能, 蓄冷换热器, 列管式, 分布参数法

Abstract:

In order to study the performance of the column tube solid sodium chloride storage heat exchanger in a supercritical compressed air energy storage system, the whole storage heat exchanger is equated to all single heat exchanger tubes in parallel, the single heat exchanger tubes as well as the sodium chloride outside the tubes are divided into microelements, and the control equations are listed for each microelement, which are discretely solved according to the different input parameters of the storage, retention and release processes of the storage heat exchanger in actual operation, and finally the air temperature distribution, sodium chloride temperature distribution, outlet mass flow rate, heat dissipation, local heat transfer coefficient and local heat transfer at different moments of the storage, retention and release processes of the storage heat exchanger. The results show that the air outlet mass flow rate fluctuates, being smaller than the inlet flow rate during the storage and larger than the inlet flow rate during the release process; the heat transfer coefficient is greatest when the air temperature reaches the quasi-critical temperature during the cross-critical flow heat transfer in the tube, and the air temperature rise rate decreases and then increases due to the increase and then decrease of the specific heat of the air near the quasi-critical temperature; the difference in the initial temperature distribution of sodium chloride leads to the change of sodium chloride temperature at the end of the cooling process. The difference in the initial temperature distribution of sodium chloride leads to different changes in the temperature of sodium chloride at each location of the heat exchanger. This study reveals the flow heat transfer law of supercritical air in the column tube solid sodium chloride storage heat exchanger, which provides a theoretical basis for the application of indirect storage heat exchanger in supercritical air energy storage.

Key words: supercritical compressed air energy storage, heat exchangers for cold storage, tubular, distributional parameter method

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