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Conversion of metallurgical coke and coal using a Coal Direct Chemical Looping (CDCL) moving bed reactor

Author

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  • Luo, Siwei
  • Bayham, Samuel
  • Zeng, Liang
  • McGiveron, Omar
  • Chung, Elena
  • Majumder, Ankita
  • Fan, Liang-Shih

Abstract

The CLC process has the potential to be a transformative commercial technology for a carbon-constrained economy. The Ohio State University Coal Direct Chemical Looping (CDCL) process directly converts coal, eliminating the need for a coal gasifier oran air separation unit (ASU). Compared to other solid-fuel CLC processes, the CDCL process is unique in that it consists of a countercurrent moving bed reducer reactor. In the proposed process, coal is injected into the middle of the moving bed, whereby the coal quickly heats up and devolatilizes, splitting the reactor roughly into two sections with no axial mixing. The top section consists of gaseous fuel produced from the coal volatiles, and the bottom section consists of the coal char mixed with the oxygen carrier. A bench-scale moving bed reactor was used to study the coal conversion with CO2 as the enhancing gas. Initial tests using metallurgical cokefines as feedstock were conducted to test the effects of operational variables in the bottom section of the moving bed reducer, e.g., reactor temperature, oxygen carrier to char ratio, enhancer gas CO2 flow rate, and oxygen carrier flow rates. Experiments directly using coal as the feedstock were subsequently carried out based on these test results. Powder River Basin (PRB) coal and Illinois #6 coal were tested as representative sub-bituminous and bituminous coals, respectively. Nearly complete coal conversion was achieved using composite iron oxide particles as the oxygen carriers without any flow problems. The operational results demonstrated that a moving bed reactor design is favorable for the CDCL application.

Suggested Citation

  • Luo, Siwei & Bayham, Samuel & Zeng, Liang & McGiveron, Omar & Chung, Elena & Majumder, Ankita & Fan, Liang-Shih, 2014. "Conversion of metallurgical coke and coal using a Coal Direct Chemical Looping (CDCL) moving bed reactor," Applied Energy, Elsevier, vol. 118(C), pages 300-308.
  • Handle: RePEc:eee:appene:v:118:y:2014:i:c:p:300-308
    DOI: 10.1016/j.apenergy.2013.11.068
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    Citations

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    Cited by:

    1. Huang, Zhen & He, Fang & Zhu, Huangqing & Chen, Dezhen & Zhao, Kun & Wei, Guoqiang & Feng, Yipeng & Zheng, Anqing & Zhao, Zengli & Li, Haibin, 2015. "Thermodynamic analysis and thermogravimetric investigation on chemical looping gasification of biomass char under different atmospheres with Fe2O3 oxygen carrier," Applied Energy, Elsevier, vol. 157(C), pages 546-553.
    2. 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.
    3. Bayham, Samuel & McGiveron, Omar & Tong, Andrew & Chung, Elena & Kathe, Mandar & Wang, Dawei & Zeng, Liang & Fan, Liang-Shih, 2015. "Parametric and dynamic studies of an iron-based 25-kWth coal direct chemical looping unit using sub-bituminous coal," Applied Energy, Elsevier, vol. 145(C), pages 354-363.
    4. Galinsky, Nathan & Mishra, Amit & Zhang, Jia & Li, Fanxing, 2015. "Ca1−xAxMnO3 (A=Sr and Ba) perovskite based oxygen carriers for chemical looping with oxygen uncoupling (CLOU)," Applied Energy, Elsevier, vol. 157(C), pages 358-367.
    5. Galinsky, Nathan & Sendi, Marwan & Bowers, Lindsay & Li, Fanxing, 2016. "CaMn1−xBxO3−δ (B=Al, V, Fe, Co, and Ni) perovskite based oxygen carriers for chemical looping with oxygen uncoupling (CLOU)," Applied Energy, Elsevier, vol. 174(C), pages 80-87.
    6. Zhang, Yitao & Wang, Dawei & Pottimurthy, Yaswanth & Kong, Fanhe & Hsieh, Tien-Lin & Sakadjian, Bartev & Chung, Cheng & Park, Cody & Xu, Dikai & Bao, Jinhua & Velazquez-Vargas, Luis & Guo, Mengqing & , 2021. "Coal direct chemical looping process: 250 kW pilot-scale testing for power generation and carbon capture," Applied Energy, Elsevier, vol. 282(PA).
    7. Coppola, Antonio & Solimene, Roberto & Bareschino, Piero & Salatino, Piero, 2015. "Mathematical modeling of a two-stage fuel reactor for chemical looping combustion with oxygen uncoupling of solid fuels," Applied Energy, Elsevier, vol. 157(C), pages 449-461.
    8. 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.
    9. Pashchenko, Dmitry, 2021. "Industrial furnaces with thermochemical waste-heat recuperation by coal gasification," Energy, Elsevier, vol. 221(C).
    10. Siriwardane, Ranjani & Benincosa, William & Riley, Jarrett & Tian, Hanjing & Richards, George, 2016. "Investigation of reactions in a fluidized bed reactor during chemical looping combustion of coal/steam with copper oxide-iron oxide-alumina oxygen carrier," Applied Energy, Elsevier, vol. 183(C), pages 1550-1564.

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