Thermochemical heat storage performances of fluidized black CaCO3 pellets under direct concentrated solar irradiation
| Autor: | Qibin Zhu, Yulong Ding, Chao Song, Hangbin Zheng, Zhonghui Zhu, Xianglei Liu, Yimin Xuan, Dachuan Liu, Ke Gao, Yongliang Li |
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| Rok vydání: | 2021 |
| Předmět: |
Work (thermodynamics)
Materials science Renewable Energy Sustainability and the Environment Mixing (process engineering) Pellets Thermal energy storage Kinetic energy Flux (metallurgy) Chemical engineering Mass transfer Physics::Space Physics Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Irradiation Physics::Chemical Physics |
| Zdroj: | Renewable Energy. 178:1353-1369 |
| ISSN: | 0960-1481 |
| DOI: | 10.1016/j.renene.2021.07.026 |
| Popis: | Conventional solar thermochemical heat storage based on indirect surface-heating usually suffers from high heat losses and low solar-chemical efficiency. Here, a different solar thermochemical heat storage system based on direct solar illumination on fluidized black CaCO3 pellets is proposed. A Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) model considering irradiation ray tracing, granular flow, heat and mass transfer, and chemical reaction, is built. Black CaCO3 pellets are fabricated via a facile template mixing method, and the solar absorptance is enhanced to 63.9% from 27.9% of traditional pure CaCO3. Effects of gas velocity and irradiative flux on thermochemical heat storage performance in a fluidized volumetric bed are investigated by incorporating measured kinetic and solar absorptance properties of designed black CaCO3 pellets. The peak solar-chemical efficiency reaches a value higher than 43% benefiting from enhanced solar absorptance, higher gas velocity and irradiative flux. This work guides the design of the high-efficiency direct solar thermochemical heat storage system. |
| Databáze: | OpenAIRE |
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