Study on characteristics of the discharge process for zeolite-liquid water adsorption heat storage system

doi:10.19799/j.cnki.2095-4239.2021.0028

Abstract

Abstract:

Adsorption heat storage is a heat storage method with high-heat storage density and low-heat loss. Zeolite-liquid water adsorption heat storage system with zeolite particles, as heat storage medium, has the advantages of a simple system, good circulation performance, and high efficiency. In this study, the characteristics of the discharge process in the zeolite-liquid water adsorption heat storage system were investigated. The two-dimensional axisymmetric convection heat transfer model of the reactor was established using Fluent. The influence of the inlet velocity, reactor aspect ratio, and particle size on the water temperature at the outlet during the discharge process was analyzed. The results showed that the maximum temperature rise of 70 ℃ can be obtained during the system's discharge process under the present calculation conditions. The smaller the inlet velocity, the larger the temperature rise, and the larger the ratio of height to diameter, the larger the temperature rise. When the aspect ratio exceeds 1.5, the temperature rise will not increase with the increase in aspect ratio. Besides, the smaller the particle size, the higher the reaction rate, and the higher the temperature rise, the more favorable it is for zeolite to fully react with water. This study improves the mechanism of the solid-liquid adsorption process and provides theoretical guidance for the design and application of the zeolite-liquid water adsorption heat storage system.

Key words: heat storage technology, adsorption heat storage, zeolite particles, discharge characteristics, water temperature at the outlet

CLC Number:

TK 02

Youqiang LINGHU, Dehou XU, Xiuyan YUE, Xuezhi ZHOU, Yujie XU, Yong SHENG, Zhitao ZUO, Haisheng CHEN. Study on characteristics of the discharge process for zeolite-liquid water adsorption heat storage system[J]. Energy Storage Science and Technology, 2021, 10(3): 1103-1108.

Figures/Tables 12

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References 14

1	汪翔, 陈海生, 徐玉杰, 等. 储热技术研究进展与趋势[J]. 科学通报, 2017, 62(15): 1602-1610.WANG X, CHEN H S, XU Y J, et al. Research progress and trend of heat storage technology[J]. Chinese Science Bulletin, 2017, 62(15): 1602-1610.
2	吴娟, 龙新峰. 太阳能热化学储能研究进展[J]. 化工进展, 2014, 33(12): 3238-3245.WU J, LONG X F. Research progress of solar thermal chemical energy storage[J]. Chemical Industry Progress, 2014, 33(12): 3238-3245.
3	LUCA S, HERBERT Z, JOHAN V B, et al. Sorption heat storage for long-term low-temperature applications: A review on the advancements at material and prototype scale[J]. Applied Energy, 2017, 12(190): 920-948.
4	闫霆, 王文欢, 王如竹. 化学吸附储热技术的研究现状及进展[J]. 材料导报, 2018, 32(12): 4107-4120.YAN T, WANG W H, WANG R Z. Present status and progress of research on chemical adsorption heat storage[J]. Materials Bulletin A: Review, 2018, 32(12): 4107-4120.
5	YEBOAH S K, DARKWA J. A critical review of thermal enhancement of packed beds for water vapour adsorption[J]. Renewable and Sustainable Energy Reviews, 2016, 4(58): 1500-1520.
6	CABEZA L F, SOLÉ A, BARRENECHE C. Review on sorption materials and technologies for heat pumps and thermal energy storage[J]. Renewable Energy, 2016, 14(32): 1-37.
7	GAEINI M, ZONDAG H A, RINDT C C. Effect of kinetics on the thermal performance of a sorption heat storage reactor[J]. Applied Thermal Engineering, 2016, 18(102): 520-531.
8	SCHAEFER M, THESS A. Modeling and simulation of closed low-pressure zeolite adsorbers for thermal energy storage[J]. International Journal of Heat and Mass Transfer, 2019, 22(139): 685-699.
9	FRÉDÉRIC K, DAMIEN G, KÉVYN J, et al. Sensitivity analysis of a zeolite energy storage model: Impact of parameters on heat storage density and discharge power density[J]. Renewable Energy, 2020, 25(149): 468-478.
10	谢云云. 基于水合盐复合材料的热化学储热性能试验和数值研究[D]. 北京: 华北电力大学, 2018.XIE Y Y. Experimental and numerical study of thermochemical heat storage performance based on hydrated salt composites[D]. Beijing: North China Electric Power University, 2018.
11	马小琨. 基于水合盐吸附的跨季节储热待性数值研究[D]. 北京: 华北电力大学, 2016.MA X K. Numerical study on interseasonal heat storage receptance based on hydrated salt adsorption[D]. Beijing: North China Electric Power University, 2016.
12	刘华, 彭佳杰, 余凯, 等. 活性氧化铝基质新型复合吸附剂的制备和储热性能[J]. 化工学报, 2020, 71(7): 3354-3361.LIU H, PENG J J, YU K, et al. Preparation and heat storage properties of novel composite adsorbents for activated alumina matrix[J]. CIESC Journal, 2020, 71(7): 3354-3361.
13	赵晓杰. 沸石分子筛吸附特性与影响因素的研究[D]. 天津: 天津科技大学, 2014.ZHAO X J. Study of zeolite adsorption characteristics and affecting factors[D]. Tianjin: Tianjin University of Science & Technology, 2005.
14	高瑞恒. 沸石在储能中的应用试验研究[D]. 北京: 北京工业大学, 2014.GAO R H. Experimental study on the application of zeolite in energy storage[D]. Beijing: Beijing University of Technology, 2005.

参数	取值
沸石密度, ρ_s/kg·m^-3	694.2
沸石比热容, c_s/J·kg^-1·K^-1	836
沸石热导率, k_s/W·m^-1·K^-1	0.2
初始床温, T₀/K	290
孔隙率, ε	0.4
进口水温, T_i/K	290
吸附热, ?H/kJ·kg^-1	1230
扩散系数, D_s0/m²·s^-1	2.92×10^-6
反应活化能E/J·mol^-1	28035

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