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Cement/CaO-modified iron ore as oxygen carrier for chemical looping combustion of coal

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  • Gu, Haiming
  • Shen, Laihong
  • Zhong, Zhaoping
  • Niu, Xin
  • Liu, Weidong
  • Ge, Huijun
  • Jiang, Shouxi
  • Wang, Lulu

Abstract

Chemical looping combustion (CLC) of solid fuels is considered as a potential technology to reduce the energy penalty and the cost for CO2 capture. However, the low efficiency of carbon conversion and gasification products conversion is a big concern for the in-situ gasification chemical looping combustion (IG-CLC) process with the low-cost natural iron ore as an oxygen carrier. This paper evaluates the enhanced fuel conversion with a new CaO-modified iron ore as oxygen carrier during the continuous coal CLC in a 1kWth reactor. Both CaO-mixed iron ore and cement/CaO-combined iron ore were tested. The effect of oxygen carrier on the gaseous products was evaluated in the fuel reactor temperature range of 880–980°C. The samples of oxygen carrier were characterized using BET, SEM–EDX and XRD. The results indicate that compared with the pure iron ore oxygen carrier, the utilization of both CaO-mixed iron ore and the cement/CaO-combined iron ore could efficiently enhance coal conversion and gaseous conversion in the fuel reactor. However, when the CaO-mixed iron ore was used, some CaO powder due to the attrition during continuous operation adhered to the particle surface of iron ore. The Ca-containing compounds, i.e., potential eutectic of a low melting point caused sintering on the particle surface of iron ore. As a result, it caused the reactivity deterioration of oxygen carrier at a high fuel reactor temperature. To avoid the occurrence of sintering on the particle surface of the oxygen carrier, an improvement of cement/CaO-combined iron ore as oxygen carrier was proposed. A stable structure of Ca2Al2SiO7 was formed during the calcination process of the cement/CaO-combined iron ore. The sintering resistance of the iron ore was improved and the oxygen carrier after experiments maintained the porous structure. Reactivity deterioration of the combined oxygen carrier did not occur during the 5h continuous operation even at the fuel reactor temperature of 980°C. Overall, the Cement/CaO-combined iron ore is a competitive oxygen carrier in the coal CLC process.

Suggested Citation

  • Gu, Haiming & Shen, Laihong & Zhong, Zhaoping & Niu, Xin & Liu, Weidong & Ge, Huijun & Jiang, Shouxi & Wang, Lulu, 2015. "Cement/CaO-modified iron ore as oxygen carrier for chemical looping combustion of coal," Applied Energy, Elsevier, vol. 157(C), pages 314-322.
    • Handle: RePEc:eee:appene:v:157:y:2015:i:c:p:314-322
    DOI: 10.1016/j.apenergy.2015.06.023
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    References listed on IDEAS

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    1. Lyngfelt, Anders, 2014. "Chemical-looping combustion of solid fuels – Status of development," Applied Energy, Elsevier, vol. 113(C), pages 1869-1873.
    2. Chen, Huichao & Zhao, Changsui & Yang, Yanmei & Zhang, Pingping, 2012. "CO2 capture and attrition performance of CaO pellets with aluminate cement under pressurized carbonation," Applied Energy, Elsevier, vol. 91(1), pages 334-340.
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    3. Lin, Shen & Gu, Zhenhua & Zhu, Xing & Wei, Yonggang & Long, Yanhui & Yang, Kun & He, Fang & Wang, Hua & Li, Kongzhai, 2020. "Synergy of red mud oxygen carrier with MgO and NiO for enhanced chemical-looping combustion," Energy, Elsevier, vol. 197(C).
    4. Haider, S.K. & Azimi, G. & Duan, L. & Anthony, E.J. & Patchigolla, K. & Oakey, J.E. & Leion, H. & Mattisson, T. & Lyngfelt, A., 2016. "Enhancing properties of iron and manganese ores as oxygen carriers for chemical looping processes by dry impregnation," Applied Energy, Elsevier, vol. 163(C), pages 41-50.
    5. Wang, Haiming & Dou, Xiaomin & Veksha, Andrei & Liu, Wen & Giannis, Apostolos & Ge, Liya & Thye Lim, Teik & Lisak, Grzegorz, 2020. "Barium aluminate improved iron ore for the chemical looping combustion of syngas," Applied Energy, Elsevier, vol. 272(C).
    6. Deng, Guixian & Li, Kongzhai & Zhang, Guifang & Gu, Zhenhua & Zhu, Xing & Wei, Yonggang & Wang, Hua, 2019. "Enhanced performance of red mud-based oxygen carriers by CuO for chemical looping combustion of methane," Applied Energy, Elsevier, vol. 253(C), pages 1-1.
    7. Liu, Guicai & Liao, Yanfen & Wu, Yuting & Ma, Xiaoqian, 2018. "Synthesis gas production from microalgae gasification in the presence of Fe2O3 oxygen carrier and CaO additive," Applied Energy, Elsevier, vol. 212(C), pages 955-965.
    8. 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.
    9. Yan, Jingchun & Shen, Laihong & Ou, Zhaowei & Wu, Jian & Jiang, Shouxi & Gu, Haiming, 2019. "Enhancing the performance of iron ore by introducing K and Na ions from biomass ashes in a CLC process," Energy, Elsevier, vol. 167(C), pages 168-180.

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