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

doi:10.19799/j.cnki.2095-4239.2022.0020

Abstract

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

CLC Number:

TK 02

WU Yuting, KOU Zhenfeng, ZHANG Cancan, WU Yiyang. Analysis of the dynamic distribution parameters of a solid sodium chloride column heat exchanger[J]. Energy Storage Science and Technology, 2022, 11(6): 1988-1995.

Figures/Tables 10

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蓄冷阶段	保温阶段	释冷阶段
进口流量2.74 kg/m³	环境温度293 K	进口流量2.74 kg/m³
进口温度77 K	时间4 h	进口温度308 K
氯化钠初始温度293 K		压强7 MPa

循环次数	蓄冷空气释放冷量/J	释冷空气得到冷量/J
第一次循环	5.25×10⁸	4.2×10⁸
第二次循环	4.47×10⁸	4.35×10⁸
第三次循环	4.44×10⁸	4.35×10⁸
第四次循环	4.44×10⁸	4.35×10⁸