SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 36 ›› Issue (8): 170-180.DOI: 10.1016/j.cjche.2020.10.002

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Calcium looping heat storage performance and mechanical property of CaO-based pellets under fluidization

Zhangke Ma1, Yingjie Li1, Boyu Li1, Zeyan Wang2, Tao Wang3, Wentao Lei3   

  1. 1 School of Energy and Power Engineering, Shandong University, Jinan 250061, China;
    2 State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;
    3 Shandong Naxin Electric Power Technology Co., Ltd., Jinan 250101, China
  • Received:2020-08-29 Revised:2020-10-04 Online:2021-09-30 Published:2021-08-28
  • Contact: Yingjie Li
  • Supported by:
    This research was supported by the National Natural Science Foundation of China (51876105), the Fundamental Research Funds of Shandong University (2018JC039) and Major Scientific and Technological Innovation Projects of Key Research & Development Program of Shandong Province (2019JZZY020118).

Calcium looping heat storage performance and mechanical property of CaO-based pellets under fluidization

Zhangke Ma1, Yingjie Li1, Boyu Li1, Zeyan Wang2, Tao Wang3, Wentao Lei3   

  1. 1 School of Energy and Power Engineering, Shandong University, Jinan 250061, China;
    2 State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;
    3 Shandong Naxin Electric Power Technology Co., Ltd., Jinan 250101, China
  • 通讯作者: Yingjie Li
  • 基金资助:
    This research was supported by the National Natural Science Foundation of China (51876105), the Fundamental Research Funds of Shandong University (2018JC039) and Major Scientific and Technological Innovation Projects of Key Research & Development Program of Shandong Province (2019JZZY020118).

Abstract: The CaO-based pellets were fabricated using extrusion-spheronization method for calcium looping thermochemical heat storage under the fluidization. The effects of adhesive, biomass-based pore-forming agent, binder and particle size on the heat storage performance and mechanical property of the CaO-based pellets were investigated in a bubbling fluidized bed reactor. The addition of 2% (mass) polyvinylpyrrolidone as an adhesive not only helps granulate, but also improves the heat storage capacity of the pellets. All biomass-templated CaO-based pellets display higher heat storage capacity than biomass-free pellets, indicating that the biomass-based pore-forming agent is beneficial for heat storage under the fluidization. Especially, bagasse-templated pellets show the highest heat storage conversion of 0.61 after 10 cycles. Moreover, Al2O3 as a binder for the pellets helps obtain high mechanical strength. The CaO-based pellets doped with 10% (mass) bagasse and 5% (mass) Al2O3 reach the highest heat storage density of 1621 kJ·kg-1 after 30 cycles and the highest crushing strength of 4.98 N. The microstructure of the bagasse-templated pellets appears more porous than that of biomass-free pellets. The bagasse-templated CaO-based pellets doped with Al2O3 seem promising for thermochemical heat storage under the fluidization, owing to the enhanced heat storage capacity, excellent mechanical strength, and simplicity of the synthesis procedure.

Key words: Calcium looping heat storage, Fluidization, CaO-based pellets, Mechanical property

摘要: The CaO-based pellets were fabricated using extrusion-spheronization method for calcium looping thermochemical heat storage under the fluidization. The effects of adhesive, biomass-based pore-forming agent, binder and particle size on the heat storage performance and mechanical property of the CaO-based pellets were investigated in a bubbling fluidized bed reactor. The addition of 2% (mass) polyvinylpyrrolidone as an adhesive not only helps granulate, but also improves the heat storage capacity of the pellets. All biomass-templated CaO-based pellets display higher heat storage capacity than biomass-free pellets, indicating that the biomass-based pore-forming agent is beneficial for heat storage under the fluidization. Especially, bagasse-templated pellets show the highest heat storage conversion of 0.61 after 10 cycles. Moreover, Al2O3 as a binder for the pellets helps obtain high mechanical strength. The CaO-based pellets doped with 10% (mass) bagasse and 5% (mass) Al2O3 reach the highest heat storage density of 1621 kJ·kg-1 after 30 cycles and the highest crushing strength of 4.98 N. The microstructure of the bagasse-templated pellets appears more porous than that of biomass-free pellets. The bagasse-templated CaO-based pellets doped with Al2O3 seem promising for thermochemical heat storage under the fluidization, owing to the enhanced heat storage capacity, excellent mechanical strength, and simplicity of the synthesis procedure.

关键词: Calcium looping heat storage, Fluidization, CaO-based pellets, Mechanical property