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Comparative study between fluidized-bed and fixed-bed operation modes in pressurized chemical looping combustion of coal

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  • Zhang, Shuai
  • Xiao, Rui
  • Zheng, Wenguang

Abstract

The performance differences between the fluidized-bed and the fixed-bed operation modes were comparatively studied in a pressurized coal-fuelled chemical looping combustion (CLC) process. Pressurized thermogravimetric (TG) analysis was applied to elucidate the findings observed in pressurized fluidized-bed and fixed-bed experiments. The results showed that the performance of the reaction between coal and oxygen carrier was strongly dependent on the operating pressure and the employed operation mode. Elevated pressure lower than 0.5MPa promoted the conversion of coal gasification products to CO2 and H2O but pressure beyond 0.5MPa resulted in a negative effect for both operation modes. TG and characterization analyses confirmed that the negative effect of pressure had little to do with oxygen carrier property but was mainly ascribed to the suppression of coal pyrolysis at high pressure which leads to a decrease in char reactivity. Fixed-bed mode showed superiority over fluidized-bed mode in enhancing the CO2 concentration and the carbon conversion, but was unfavourable for the pore structural properties of oxygen carrier, and thereby undesirable for long-term stable operation.

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  • Zhang, Shuai & Xiao, Rui & Zheng, Wenguang, 2014. "Comparative study between fluidized-bed and fixed-bed operation modes in pressurized chemical looping combustion of coal," Applied Energy, Elsevier, vol. 130(C), pages 181-189.
    • Handle: RePEc:eee:appene:v:130:y:2014:i:c:p:181-189
    DOI: 10.1016/j.apenergy.2014.05.049
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    5. Voitic, Gernot & Nestl, Stephan & Lammer, Michael & Wagner, Julian & Hacker, Viktor, 2015. "Pressurized hydrogen production by fixed-bed chemical looping," Applied Energy, Elsevier, vol. 157(C), pages 399-407.
    6. Xing Chen & Shuai Zhang & Rui Xiao & Peng Li, 2017. "Modification of traditionally impregnated Fe 2 O 3 /Al 2 O 3 oxygen carriers by ultrasonic method and their performance in chemical looping combustion," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 7(1), pages 65-77, February.
    7. Mayer, Karl & Penthor, Stefan & Pröll, Tobias & Hofbauer, Hermann, 2015. "The different demands of oxygen carriers on the reactor system of a CLC plant – Results of oxygen carrier testing in a 120kWth pilot plant," Applied Energy, Elsevier, vol. 157(C), pages 323-329.
    8. Lu, Xuao & Rahman, Ryad A. & Lu, Dennis Y. & Ridha, Firas N. & Duchesne, Marc A. & Tan, Yewen & Hughes, Robin W., 2016. "Pressurized chemical looping combustion with CO: Reduction reactivity and oxygen-transport capacity of ilmenite ore," Applied Energy, Elsevier, vol. 184(C), pages 132-139.
    9. Zeng, Jimin & Xiao, Rui & Yuan, Jun, 2021. "High-quality syngas production from biomass driven by chemical looping on a PY-GA coupled reactor," Energy, Elsevier, vol. 214(C).
    10. Jacobs, M. & Van Noyen, J. & Larring, Y. & Mccann, M. & Pishahang, M. & Amini, S. & Ortiz, M. & Galluci, F. & Sint-Annaland, M.V. & Tournigant, D. & Louradour, E. & Snijkers, F., 2015. "Thermal and mechanical behaviour of oxygen carrier materials for chemical looping combustion in a packed bed reactor," Applied Energy, Elsevier, vol. 157(C), pages 374-381.
    11. Sreenivasulu, B. & Gayatri, D.V. & Sreedhar, I. & Raghavan, K.V., 2015. "A journey into the process and engineering aspects of carbon capture technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 41(C), pages 1324-1350.
    12. Qiang Tian & Lixin Che & Bin Ding & Qianwei Wang & Qingquan Su, 2017. "Performance of Cu‐Fe‐based oxygen carrier in a CLC process based on fixed bed reactors," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 7(4), pages 731-744, August.
    13. Zeng, Jimin & Xiao, Rui & Zhang, Shuai & Zhang, Huiyan & Zeng, Dewang & Qiu, Yu & Ma, Zhong, 2018. "Identifying iron-based oxygen carrier reduction during biomass chemical looping gasification on a thermogravimetric fixed-bed reactor," Applied Energy, Elsevier, vol. 229(C), pages 404-412.
    14. Gu, Zhenhua & Li, Kongzhai & Wang, Hua & Qing, Shan & Zhu, Xing & Wei, Yonggang & Cheng, Xianming & Yu, He & Cao, Yan, 2016. "Bulk monolithic Ce–Zr–Fe–O/Al2O3 oxygen carriers for a fixed bed scheme of the chemical looping combustion: Reactivity of oxygen carrier," Applied Energy, Elsevier, vol. 163(C), pages 19-31.
    15. Zhang, Hao & Hong, Hui & Jiang, Qiongqiong & Deng, Ya'nan & Jin, Hongguang & Kang, Qilan, 2018. "Development of a chemical-looping combustion reactor having porous honeycomb chamber and experimental validation by using NiO/NiAl2O4," Applied Energy, Elsevier, vol. 211(C), pages 259-268.
    16. Qiang Tian & Lixin Che & Bin Ding & Qianwei Wang & Qingquan Su, 2018. "Performance of a Cu–Fe‐based oxygen carrier combined with a Ni‐based oxygen carrier in a chemical‐looping combustion process based on fixed‐bed reactors," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 8(3), pages 542-556, June.
    17. Zhao, Ying-jie & Zhang, Yu-ke & Cui, Yang & Duan, Yuan-yuan & Huang, Yi & Wei, Guo-qiang & Mohamed, Usama & Shi, Li-juan & Yi, Qun & Nimmo, William, 2022. "Pinch combined with exergy analysis for heat exchange network and techno-economic evaluation of coal chemical looping combustion power plant with CO2 capture," Energy, Elsevier, vol. 238(PA).

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