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Non-isothermal carbothermic reduction kinetics of calcium ferrite and hematite as oxygen carriers for chemical looping gasification applications

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  • Li, Gang
  • Lv, Xuewei
  • Ding, Chengyi
  • Zhou, Xuangeng
  • Zhong, Dapeng
  • Qiu, Guibao

Abstract

Oxygen carriers play an important role in the excellent operation of the chemical looping gasification technology. The aim of this study is to perform a fundamental investigation on the reduction behavior and kinetics of CaO·Fe2O3 and Fe2O3 oxygen carriers. The oxygen carrier reaction performance was studied by a non-isothermal method using thermo-gravimetric analysis coupled with mass spectrometry. The application of model fitting method was adopted to describe the reduction process. X-ray diffraction measurements indicated that CaO·Fe2O3 was reduced to CaO and Fe following four stages (CaO·Fe2O3 → CaO·FeO·Fe2O3 → CaO·3FeO·Fe2O3 → 2CaO·Fe2O3 → Fe). The predominance range of CO generation corresponded to the stage from CaO·3FeO·Fe2O3 to Fe during CaO·Fe2O3 reduction, whereas during Fe2O3 reduction, it corresponded to the stage from FeO to Fe. The reduction of CaO·Fe2O3 can be described by a 2-D diffusion model during the entire reduction process, whereas the reduction of Fe2O3 can be initially described by a 3-D diffusion model when the reduction degree is within the range of 0–0.2, and subsequently by a reaction model when it is within the range of 0.2–1. The complex reduction intermediates of CaO·Fe2O3 resulted in the poor diffusion condition of lattice oxygen and gas products. CaO·Fe2O3 is a more promising oxygen carrier than Fe2O3 to generate CO in the chemical looping gasification technology.

Suggested Citation

  • Li, Gang & Lv, Xuewei & Ding, Chengyi & Zhou, Xuangeng & Zhong, Dapeng & Qiu, Guibao, 2020. "Non-isothermal carbothermic reduction kinetics of calcium ferrite and hematite as oxygen carriers for chemical looping gasification applications," Applied Energy, Elsevier, vol. 262(C).
    • Handle: RePEc:eee:appene:v:262:y:2020:i:c:s0306261920301161
    DOI: 10.1016/j.apenergy.2020.114604
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