Flow characteristics simulation of spiral coil reactor used in the thermochemical energy storage system

doi:10.1016/j.cjche.2021.04.027

中国化学工程学报 ›› 2022, Vol. 42 ›› Issue (2): 364-379.DOI: 10.1016/j.cjche.2021.04.027

Flow characteristics simulation of spiral coil reactor used in the thermochemical energy storage system

Xiaoyi Chen^1,2, Danyang Song¹, Dong Zhang¹, Xiaogang Jin¹, Xiang Ling¹, Dongren Liu³

1. School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China;
2. School of Mechanical Engineering, Shanghai Institute of Technology, Shanghai 201418, China;
3. Mechanical Engineering College, Yangzhou University, Yangzhou 225009, China

收稿日期:2020-05-21 修回日期:2021-04-08 出版日期:2022-02-28 发布日期:2022-03-30
通讯作者: Xiang Ling,E-mail:xling@njtech.edu.cn
基金资助:
The authors acknowledge the financial support provided by Natural Science Foundation of Jiangsu Province (BK20180936) and the Initial Funding of Scientific Research for the Introduction of Talents (YJ2021-41).

Flow characteristics simulation of spiral coil reactor used in the thermochemical energy storage system

Xiaoyi Chen^1,2, Danyang Song¹, Dong Zhang¹, Xiaogang Jin¹, Xiang Ling¹, Dongren Liu³

1. School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China;
2. School of Mechanical Engineering, Shanghai Institute of Technology, Shanghai 201418, China;
3. Mechanical Engineering College, Yangzhou University, Yangzhou 225009, China

Received:2020-05-21 Revised:2021-04-08 Online:2022-02-28 Published:2022-03-30
Contact: Xiang Ling,E-mail:xling@njtech.edu.cn
Supported by:
The authors acknowledge the financial support provided by Natural Science Foundation of Jiangsu Province (BK20180936) and the Initial Funding of Scientific Research for the Introduction of Talents (YJ2021-41).

摘要/Abstract

摘要： According to environmental and energy issues, renewable energy has been vigorously promoted. Now solar power is widely used in many areas but it is limited by the weather conditions and cannot work continuously. Heat storage is a considerable solution for this problem and thermochemical energy storage is the most promising way because of its great energy density and stability. However, this technology is not mature enough to be applied to the industry. The reactor is an important component in the thermochemical energy storage system where the charging and discharging process happens. In this paper, a spiral coil is proposed and used as a reactor in the thermochemical energy storage system. The advantages of the spiral coil include simple structure, small volume, and so on. To investigate the flow characteristics, the simulation was carried out based on energy-minimization multi-scale model (EMMS) and Eulerian two-phase model. CaCO₃ particles were chosen as the reactants. Particle distribution was shown in the results. The gas initial velocity was set to 2 m·s^-1, 3 m·s^-1, and 4 m·s^-1. When the particles flowed in the coil, gravity, centrifugal force and drag force influenced their flow. With the Reynold numbers increasing, centrifugal and drag force got larger. Accumulation phenomenon existed in the coil and results showed with the gas velocity increasing, accumulation moved from the bottom to the outer wall of the coil. Besides, the accumulation phenomenon was stabilized when φ > 720°. Also due to the centrifugal force, a secondary flow formed, which means solid particles moved from the inside wall to the outside wall. This secondary flow could promote turbulence and mixing of particles and gas. In addition, when the particle volume fraction is reduced from 0.2 to 0.1, the accumulation at the bottom of the coil decreases, and the unevenness of the velocity distribution becomes larger.

关键词: Thermochemical energy storage, CaCO₃/CaO, Reactors, Simulation, Two-phase flow, Energy-minimization multi-scale model (EMMS)

Abstract: According to environmental and energy issues, renewable energy has been vigorously promoted. Now solar power is widely used in many areas but it is limited by the weather conditions and cannot work continuously. Heat storage is a considerable solution for this problem and thermochemical energy storage is the most promising way because of its great energy density and stability. However, this technology is not mature enough to be applied to the industry. The reactor is an important component in the thermochemical energy storage system where the charging and discharging process happens. In this paper, a spiral coil is proposed and used as a reactor in the thermochemical energy storage system. The advantages of the spiral coil include simple structure, small volume, and so on. To investigate the flow characteristics, the simulation was carried out based on energy-minimization multi-scale model (EMMS) and Eulerian two-phase model. CaCO₃ particles were chosen as the reactants. Particle distribution was shown in the results. The gas initial velocity was set to 2 m·s^-1, 3 m·s^-1, and 4 m·s^-1. When the particles flowed in the coil, gravity, centrifugal force and drag force influenced their flow. With the Reynold numbers increasing, centrifugal and drag force got larger. Accumulation phenomenon existed in the coil and results showed with the gas velocity increasing, accumulation moved from the bottom to the outer wall of the coil. Besides, the accumulation phenomenon was stabilized when φ > 720°. Also due to the centrifugal force, a secondary flow formed, which means solid particles moved from the inside wall to the outside wall. This secondary flow could promote turbulence and mixing of particles and gas. In addition, when the particle volume fraction is reduced from 0.2 to 0.1, the accumulation at the bottom of the coil decreases, and the unevenness of the velocity distribution becomes larger.

Key words: Thermochemical energy storage, CaCO₃/CaO, Reactors, Simulation, Two-phase flow, Energy-minimization multi-scale model (EMMS)

Xiaoyi Chen, Danyang Song, Dong Zhang, Xiaogang Jin, Xiang Ling, Dongren Liu. Flow characteristics simulation of spiral coil reactor used in the thermochemical energy storage system[J]. 中国化学工程学报, 2022, 42(2): 364-379.

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Flow characteristics simulation of spiral coil reactor used in the thermochemical energy storage system

Flow characteristics simulation of spiral coil reactor used in the thermochemical energy storage system

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