Parameter optimization of a thermochemical reactor using salt hydrates： A case study of heating application

doi:10.19799/j.cnki.2095-4239.2023.0686

Abstract

Abstract:

Thermochemical energy storage with salt hydrates has the advantages of high heat-storage density and nearly zero heat loss in the long storage process; these are of great significance for the efficient utilization of renewable energy. The design and operation control of reactors are crucial for the performance of thermochemical heat storage of salt hydrates. However, multiphysical field-simulation software is widely used for modeling, which is not suitable for long-term research under dynamic conditions. Therefore, in this study, we establish a dynamic simulation model for thermochemical reactors. In addition, sensitivity analysis was conducted to determine the effects of factors such as inlet air temperature, water-vapor partial pressure, flow rate, and reactor size on the outlet parameters. The results show that the airflow rate significantly affected the response time, stable output time, and heat release power. In addition, the partial pressure of water vapor greatly affected the temperature rise, while displaying almost no effect on the total heat release. Finally, by considering a residential building in Changsha as an example, we studied the charging process of the reactor under typical daily meteorological parameters during winter. Compared with the condition without control strategies, the adoption of appropriate control strategies could effectively improve the matching between the heat release power of the reactor and its heat load. The findings of this study could provide a guide for the design and control strategy determination of thermochemical reactors.

Key words: thermochemical heat storage, salt hydrates, dynamic numerical simulation, control strategies

CLC Number:

TK 02

Jixiang GE, Mingxi JI, Yulong DING, Yimo LUO, Liming WANG. Parameter optimization of a thermochemical reactor using salt hydrates： A case study of heating application[J]. Energy Storage Science and Technology, 2023, 12(12): 3799-3807.

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参数名称	数值
参数名称	-40%	-20%	0(基准)	+20%	+40%
入口空气温度/℃	12	16	20	24	28
入口空气水蒸气分压力/Pa	840	1120	1400	1680	1960
流速/(m/s)	0.06	0.08	0.1	0.12	0.14
反应器长度/m	0.36	0.48	0.6	0.72	0.84

参数	反应器长度	空气流速	水蒸气分压力	入口空气温度
平均温升	0	0	Ⅱ	-Ⅱ
响应时间	Ⅱ	-Ⅲ	-Ⅰ	0
稳定输出时间	Ⅲ	-Ⅲ	-Ⅱ	Ⅲ
功率	0	Ⅱ	Ⅱ	-Ⅱ
总放热量	Ⅰ	-Ⅰ	0	Ⅰ

名称	围护结构	传热系数/ [W/(m²·K)]
外墙	20 mm水泥砂浆+400 mm多孔砖+20 mm水泥砂浆+50 mm保温板	0.32
屋顶	40 mm混凝土板+40 mm防水层+20 mm波形石棉瓦	0.13
门	80 mm铝合金门	3.2
窗	3 mm透明玻璃+10 mm空气层+3 mm透明玻璃	1.7

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