基于相变堆积床的卡诺电池系统设计与实验研究

doi:10.19799/j.cnki.2095-4239.2023.0314

储能科学与技术 ›› 2023, Vol. 12 ›› Issue (9): 2823-2832.doi: 10.19799/j.cnki.2095-4239.2023.0314

基于相变堆积床的卡诺电池系统设计与实验研究

孛衍君(), 薛新杰, 王化宁, 赵长颖()

上海交通大学中英国际低碳学院，上海 201306

收稿日期:2023-05-05 修回日期:2023-05-14 出版日期:2023-09-05 发布日期:2023-09-16
通讯作者: 赵长颖 E-mail:yanjun.bo@sjtu.edu.cn;changying.zhao@sjtu.edu.cn
作者简介:孛衍君（1998—），男，硕士研究生，研究方向为相变储热系统，E-mail：yanjun.bo@sjtu.edu.cn；
基金资助:
国家自然科学基金重大项目(52090063)

System design and experimental study of Carnot battery based on latent heat/cold stores

Yanjun BO(), Xinjie XUE, Huaning WANG, Changying ZHAO()

China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, China

Received:2023-05-05 Revised:2023-05-14 Online:2023-09-05 Published:2023-09-16
Contact: Changying ZHAO E-mail:yanjun.bo@sjtu.edu.cn;changying.zhao@sjtu.edu.cn

摘要/Abstract

摘要：

卡诺电池系统是一项将过余电量以热能的形式存储起来，需要的时候通过动力循环向外释放的大规模物理储能系统，其摆脱了地理环境限制且紧凑高效，在削峰填谷、长时储能方面具有广泛前景。本工作设计了一套基于正/逆布雷顿循环和相变储热技术的10 MWh级卡诺电池系统，建立了基于Python3.8的数值模型，探究了压比、等熵效率、工质雷诺数、介质长径比等参数对系统性能的影响，结果表明该系统运行在压比为10、等熵效率0.9工况下时往返效率可以达到0.6，储能和功率密度分别达到378.44 kWh/m³、203.58 kW/m³。在不同的运行参数下分别对两个储罐的储能过程进行了实验研究，验证了当入口处工质压力越大、温度与室温温差越大，系统的储能密度与功率密度越高。

关键词: 卡诺电池系统, 相变储热, 数值模拟, 无量纲化分析, 堆积床, 储热性能

Abstract:

The Carnot battery system is a large-scale physical energy storage system that stores excess power in the form of heat energy and releases it outward through the power cycle when needed. It is free from geographical environment limitations, coMPact, and efficient, and has broad prospects in peak shaving, valley filling, and long-term energy storage. In this paper, a 10 MWh-class Carnot battery system was designed based on positive/reverse Brayton cycle and phase change heat storage technology.A numerical modelwas establishedbased on Python 3.8, and the influences of pressure ratio, isentropic efficiency, working fluid Reynolds number, medium length to diameter ratio, and other parameters on the system performance were explored.The results showed that the round-trip efficiency of the system could reach 0.6 when operating under the conditions of a compression ratio of 10 and isentropic efficiency of 0.9, and the energy storage and power density reached 378.44 kWh/m³ and 203.58 kW/m³, respectively. The energy storage process of the two tanks was experimentally studied under different operating parameters. It was verified that the greater the working fluid pressure at the entrance and the greater the difference between working and room temperatures, the higher the system's energy storage and power density.

Key words: Carnot battery system, phase change heat storage, dimensionless analysis, packed-bed, thermal storage performance

中图分类号:

TQ 028

孛衍君, 薛新杰, 王化宁, 赵长颖. 基于相变堆积床的卡诺电池系统设计与实验研究[J]. 储能科学与技术, 2023, 12(9): 2823-2832.

Yanjun BO, Xinjie XUE, Huaning WANG, Changying ZHAO. System design and experimental study of Carnot battery based on latent heat/cold stores[J]. Energy Storage Science and Technology, 2023, 12(9): 2823-2832.

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参数/单位	储热罐	储冷罐
储能介质	NaOH粉末	质量分数15% CaCl₂水溶液
长度l/m	5	5
直径D/m	4	3
体积V/m³	121	81
压缩比β	10
等熵效率η	0.9
相变温度T_p/K	491	228
相变潜热L/(kJ/kg)	284	160
密度ρ/(kg/m³)	2130	1286
固态比热容c_p_,s/[kJ/(kg·K)]	2.9	2.6
液态比热容c_p_,l/[kJ/(kg·K)]	2.1	2
热导率λ/[W/(m·K)]	0.6	1.1

参数	储热罐	储冷罐
压力容器高度×外径×厚度/mm	800×662×12	650×512×6
相邻隔板间距/mm	250	200
储能介质单元体长度×宽度×高度/mm	150×150×200	100×100×150
容器个数/个	21	21
孔隙率	0.62	0.71

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基于相变堆积床的卡诺电池系统设计与实验研究

System design and experimental study of Carnot battery based on latent heat/cold stores

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