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Selecting and Testing of Cement-Bonded Magnetite and Chalcopyrite as Oxygen Carrier for Chemical-Looping Combustion

Author

Listed:
  • Mengjun Li

    (College of Engineering, Huazhong Agricultural University, Wuhan 430070, China)

  • Teng Zheng

    (College of Engineering, Huazhong Agricultural University, Wuhan 430070, China)

  • Daofeng Mei

    (College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
    Division of Energy Technology, Department of Space, Earth and Environment, Chalmers University of Technology, 41296 Gothenburg, Sweden)

  • Baowen Wang

    (Research Institute for Coal Clean and Efficient Utilization, College of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou 450045, China)

  • Jingjing Ma

    (State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China)

Abstract

Combining iron and copper ores can generate an oxygen carrier that has a synergic effect of high temperature resistance and high reactivity. In this work, typical cements available in the market were studied as binders to bind magnetite and chalcopyrite to develop a suitable oxygen carrier for chemical-looping combustion (CLC). A first selection step suggested that an aluminate cement, namely CA70, could favor the generation of oxygen carrier particles having good crushing strength, good particle yield, and high reactivity. The CA70-bonded oxygen carrier was then subjected to cyclic tests with CH 4 , CO, and H 2 in reduction and in air oxidation at temperatures of 850, 900, and 950 °C with gas concentrations of 5, 10, 15, and 20% in a batch-fluidized bed reactor. The increase in temperature promoted the fuel conversion. At 950 °C, the conversions of CH 4 and CO reached up to 80.4% and 99.2%, respectively. During more than 30 cycles, the oxygen carrier kept a similar reactivity to the fresh carrier and maintained its composition and physical properties. The oxygen transport capacity was maintained at 21–23%, and the phases were CuO, Fe 2 O 3 , Al 2 O 3 , and minor CaS. In the used sample, some grains were observed, but the morphology was not greatly changed. Agglomeration was absent during all the cycles, except for the deep reduction with H 2 .

Suggested Citation

  • Mengjun Li & Teng Zheng & Daofeng Mei & Baowen Wang & Jingjing Ma, 2022. "Selecting and Testing of Cement-Bonded Magnetite and Chalcopyrite as Oxygen Carrier for Chemical-Looping Combustion," Energies, MDPI, vol. 15(14), pages 1-18, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:14:p:5093-:d:861267
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    References listed on IDEAS

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    1. Ma, Jinchen & Zhao, Haibo & Tian, Xin & Wei, Yijie & Rajendran, Sharmen & Zhang, Yongliang & Bhattacharya, Sankar & Zheng, Chuguang, 2015. "Chemical looping combustion of coal in a 5kWth interconnected fluidized bed reactor using hematite as oxygen carrier," Applied Energy, Elsevier, vol. 157(C), pages 304-313.
    2. Tian, Xin & Zhao, Haibo & Ma, Jinchen, 2017. "Cement bonded fine hematite and copper ore particles as oxygen carrier in chemical looping combustion," Applied Energy, Elsevier, vol. 204(C), pages 242-253.
    3. Siriwardane, Ranjani & Tian, Hanjing & Miller, Duane & Richards, George, 2015. "Fluidized bed testing of commercially prepared MgO-promoted hematite and CuO–Fe2O3 mixed metal oxide oxygen carriers for methane and coal chemical looping combustion," Applied Energy, Elsevier, vol. 157(C), pages 348-357.
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