4.8 Article

Solid oxide fuel cell-internal combustion engine hybrid system utilizing an internal combustion engine for anode off-gas recirculation, external reforming, and additional power generation

Journal

APPLIED ENERGY
Volume 328, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2022.120146

Keywords

Solid oxide fuel cell -internal combustion en; gine hybrid system; Solid oxide fuel cell; Homogeneous charge compression ignition; Engine reformer; Recirculation; System efficiency

Funding

  1. National Research Foundation of Korea (NRF) - Korea government (MSIT)
  2. Seoul National University Institute of Advanced Machinery and Design (IAMD)
  3. [2020R1F1A1069430]

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This study introduced a high-efficiency solid oxide fuel cell-internal combustion engine hybrid system utilizing the ICE for anode off-gas recirculation, external reforming, and additional power generation.
A solid oxide fuel cell (SOFC)-internal combustion engine (ICE) hybrid system is proposed and analyzed. Although the existing SOFC-ICE hybrid system improves the efficiency of the SOFC stand-alone system by deriving additional power from the anode off-gas in the ICE, the proposed hybrid system further increases the system efficiency by utilizing the ICE for anode off-gas recirculation, external reforming, and additional power generation. Accordingly, we developed models for the SOFC and ICE and performed simulations to understand the operational characteristics of the hybrid system. Through simulation, the influence of each control parameter was analyzed, and the system operable ranges were determined according to the rate of system heat loss. When the heat loss considered is the least, a gross system efficiency of 66.9% is achieved at the optimum point. Thus, this study developed a high-efficiency SOFC-ICE hybrid system by combining methods that utilize the ICE as a recirculation blower, reformer, and power generator.

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