Endothermic Performances of Fe- and Mn-modified Carbide Slags in CaCO3/CaO Thermochemical Heat Storage Cycles

  • YU Hao ,
  • WANG Weiran ,
  • BIAN Zhiguo ,
  • MA Xiaotong ,
  • LU Xiao ,
  • CHANG Long ,
  • ZHANG Wan
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  • 1. College of Energy Storage Technology, Shandong University of Science and Technology, Qingdao 266590, China
    2. Dezhou Energy Storage Technology Institute, Shandong University of Science and Technology, Dezhou 253700, China
    3. College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China

Online published: 2025-07-04

Supported by

This research was supported by the National Natural Science Foundation of China (62273213, 52006128), Shandong Provincial Natural Science Foundation (ZR2023QE196), Qingdao Natural Science Foundation (23-2-1-87-zyyd-jch), Qingdao Postdoctoral Innovation Project (QDBSH20230102003), Natural Science Foundation of Shandong Province for Innovation and Development Joint Funds (ZR2022LZH001), Youth Innovation Team of universities in Shandong Province (2022KJ221), and Project of Shandong Province Higher Educational Young Innovative Talent Introduction and Cultivation Team (Hydrogen energy chemistry innovation team).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025

Abstract

The modification with dark metallic oxide is identified as the crucial strategy to enhance optical absorptions of calcium-based materials for the direct solar-driven thermochemical energy storage. The effect of modification on the heat release behavior in carbonation of calcium-based material has been widely investigated, but its effect on the heat storage behavior in calcination is lacking of sufficient research, typically for low-cost calcium resource such as carbide slag. The Fe-modified and Mn-modified carbide slags for CaCO3/CaO heat storage were synthesized and their optimum decomposition temperatures, effective heat storage conversions, heat flows and heat storage rates in endothermic stage were investigated. Although the Fe modification exacerbates the CaO sintering due to the formation of Ca2Fe2O5, that is still effective in reducing the regeneration temperature of CaO in CaCO3/CaO cycles. The Mn modification enhances significantly sintering resistance by forming the CaMnO3 and its transformation into Ca2MnO4. The effective heat storage conversion of Mn-modified carbide slag after 30 cycles is 3.2 times as high as that of untreated carbide slag. Mn-modified carbide slag exhibits the lowest regeneration temperature and the highest heat storage rate after cycles. The loose and stable porous structure of Mn-modified carbide slag contributes to its superior endothermic performance. Therefore, Mn-modified carbide slag seems to be the potential candidate for calcium looping thermochemical heat storage.

Cite this article

YU Hao , WANG Weiran , BIAN Zhiguo , MA Xiaotong , LU Xiao , CHANG Long , ZHANG Wan . Endothermic Performances of Fe- and Mn-modified Carbide Slags in CaCO3/CaO Thermochemical Heat Storage Cycles[J]. Journal of Thermal Science, 2025 , 34(4) : 1149 -1161 . DOI: 10.1007/s11630-025-2159-5

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