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Numerical Simulation of Fluidized Bed Gasifier Coupled with Solid Oxide Fuel Cell Fed with Solid Carbon

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  • Dongxu Zhang

    (School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China)

  • Ting Min

    (School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China)

  • Ming Jiang

    (School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China)

  • Yaxiong Yu

    (School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China)

  • Qiang Zhou

    (School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
    State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

Abstract

A model of a fluidized bed coupled with direct carbon solid oxide fuel cell (SOFC) is developed to explore the effect of coupling between fluidized bed and solid oxide fuel cell. Three gas–solid flow regimes are involved including fixed bed, delayed bubbling bed and bubbling bed. The anode reaction of SOFC is treated as the coupling processes of Boudouard gasification of carbon and electrochemical oxidation of CO. The effects of inlet velocity of the fluidizing agent CO 2 , carbon activity, channel width and coupling extent on the system performance are investigated. The results show that the inlet velocity of CO 2 can promote the gasification rate in the anode, but too high velocities may lower CO molar fraction. The gasification rate generally increases with the increase of the channel width and carbon activity. The overlapping area between the anode surface and the initial carbon bed, gas–solid regime and carbon activity have a significant influence on the gasification rate and the maximum current density the system can support. Overall, the mass transport in the anode is dramatically enhanced by the expansion of the carbon bed, back-mixing, solid mixing and gas mixing, especially for the delayed bubbling bed and bubbling bed. This indicates that the adopted coupling method is feasible to improve the anode performance of direct carbon solid oxide fuel cell.

Suggested Citation

  • Dongxu Zhang & Ting Min & Ming Jiang & Yaxiong Yu & Qiang Zhou, 2021. "Numerical Simulation of Fluidized Bed Gasifier Coupled with Solid Oxide Fuel Cell Fed with Solid Carbon," Energies, MDPI, vol. 14(10), pages 1-24, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:10:p:2800-:d:553983
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    References listed on IDEAS

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