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The direct solid-solid reaction between coal char and iron-based oxygen carrier and its contribution to solid-fueled chemical looping combustion

Author

Listed:
  • Chen, Liangyong
  • Bao, Jinhua
  • Kong, Liang
  • Combs, Megan
  • Nikolic, Heather S.
  • Fan, Zhen
  • Liu, Kunlei

Abstract

Chemical looping combustion (CLC) is an advanced technology developed to achieve highly efficient fuel combustion with in-situ CO2 capture. In this process, metal oxide particles are used as an oxygen carrier (OC) to transport lattice oxygen for fuel combustion. In this process, a stream of CO2 and steam is produced by successful separation of atmospheric N2 and the gaseous product of combustion. In CLC of solid fuel, metal oxide particles are physically mixed and react with solid fuel at high temperature using gasification enhancer, such as steam, or CO2. A full understanding of the reaction mechanism between the OC and solid fuel is vital for OC development and the fuel reactor design. Several reactions may be involved in solid-fueled CLC when an iron-based OC is used, including (1) solid fuel devolatilization/gasification, (2) OC reduction with intermediate syngas, (3) the solid-solid reaction between OC and solid fuel via direct contact, and (4) the homogeneous water-gas shift reaction. The former two reactions have been extensively studied in recent years. This study focuses on the third reaction, the solid-solid reaction, which occurs thermodynamically at typical operational temperatures of CLC. The direct solid-solid reaction between coal char and two iron-based OCs via random particle collision in a fluidization bed regime was investigated and focuses on the reaction kinetics and the carbon conversion at different temperature. The contribution of the solid-solid reaction to the global carbon conversion was estimated for steam-gasified CLC at different temperature. The solid-solid reaction via static contact in a thermal-gravimetric analyzer (TGA) was also tested to evaluate the role of different OCs and to better understand the reaction mechanism between the two solid particles.

Suggested Citation

  • Chen, Liangyong & Bao, Jinhua & Kong, Liang & Combs, Megan & Nikolic, Heather S. & Fan, Zhen & Liu, Kunlei, 2016. "The direct solid-solid reaction between coal char and iron-based oxygen carrier and its contribution to solid-fueled chemical looping combustion," Applied Energy, Elsevier, vol. 184(C), pages 9-18.
    • Handle: RePEc:eee:appene:v:184:y:2016:i:c:p:9-18
    DOI: 10.1016/j.apenergy.2016.09.085
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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. Tong, Andrew & Bayham, Samuel & Kathe, Mandar V. & Zeng, Liang & Luo, Siwei & Fan, Liang-Shih, 2014. "Iron-based syngas chemical looping process and coal-direct chemical looping process development at Ohio State University," Applied Energy, Elsevier, vol. 113(C), pages 1836-1845.
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    1. Cheng, Long & Wu, Zhiqiang & Zhang, Zhiguo & Guo, Changqing & Ellis, Naoko & Bi, Xiaotao & Paul Watkinson, A. & Grace, John R., 2020. "Tar elimination from biomass gasification syngas with bauxite residue derived catalysts and gasification char," Applied Energy, Elsevier, vol. 258(C).
    2. Durmaz, Merve & Dilmaç, Nesibe & Dilmaç, Ömer Faruk, 2020. "Evaluation of performance of copper converter slag as oxygen carrier in chemical-looping combustion (CLC)," Energy, Elsevier, vol. 196(C).
    3. Siriwardane, Ranjani & Riley, Jarrett & Atallah, Chris, 2022. "CO2 utilization potential of a novel calcium ferrite based looping process fueled with coal: Experimental evaluation of various coal feedstocks and thermodynamic integrated process analysis," Applied Energy, Elsevier, vol. 323(C).
    4. Schneider, T. & Moffitt, J. & Volz, N. & Müller, D. & Karl, J., 2022. "Long-term effects of ilmenite on a micro-scale bubbling fluidized bed combined heat and power pilot plant for oxygen carrier aided combustion of wood," Applied Energy, Elsevier, vol. 314(C).
    5. Falko Marx & Paul Dieringer & Jochen Ströhle & Bernd Epple, 2021. "Design of a 1 MW th Pilot Plant for Chemical Looping Gasification of Biogenic Residues," Energies, MDPI, vol. 14(9), pages 1-25, April.
    6. Riley, Jarrett & Siriwardane, Ranjani & Tian, Hanjing & Benincosa, William & Poston, James, 2017. "Kinetic analysis of the interactions between calcium ferrite and coal char for chemical looping gasification applications: Identifying reduction routes and modes of oxygen transfer," Applied Energy, Elsevier, vol. 201(C), pages 94-110.
    7. 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.
    8. Liu, Shuai & Xiang, Dong & Xu, Ying & Sun, Zhe & Cao, Yan, 2017. "Relationship between electronic properties of Fe3O4 substituted by Ca and Ba and their reactivity in chemical looping process: A first-principles study," Applied Energy, Elsevier, vol. 202(C), pages 550-557.
    9. Chen, Liangyong & Bao, Jinhua & Kong, Liang & Combs, Megan & Nikolic, Heather S. & Fan, Zhen & Liu, Kunlei, 2017. "Activation of ilmenite as an oxygen carrier for solid-fueled chemical looping combustion," Applied Energy, Elsevier, vol. 197(C), pages 40-51.

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