4.7 Article

Thermochemical heat storage performances of fluidized black CaCO3 pellets under direct concentrated solar irradiation

Journal

RENEWABLE ENERGY
Volume 178, Issue -, Pages 1353-1369

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2021.07.026

Keywords

Thermochemical heat storage; Calcium carbonate; Full-spectrum; Fluidized bed; Direct irradiation

Funding

  1. National Natural Science Foundation of China [51820105010, 52076106, 52111530136]
  2. Natural Science Foundation of Jiangsu Province [BK20202008]
  3. Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX21_0210]

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This study proposes a different solar thermochemical heat storage system based on direct solar illumination on fluidized black CaCO3 pellets, achieving higher solar absorptance and solar-chemical efficiency by optimizing the design of the black CaCO3 pellets.
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. (C) 2021 Elsevier Ltd. All rights reserved.

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