A fuel cell free piston gas turbine hybrid architecture for high-efficiency, load-flexible power generation

Brian Gainey and Benjamin Lawler

Applied Energy, 2021, vol. 283, issue C, No S0306261920316366

Abstract: Hybrid systems that incorporate fuel cells, such as fuel cell-gas turbine (FC-GT) and fuel cell-internal combustion engine (FC-ICE) systems, are increasing in popularity as a means to provide high-efficiency, load-flexible power generation. A free-piston gas turbine (FPGT) engine is a synergetic compromise between GTs and ICEs. This work is the first to propose an FC-FPGT hybrid architecture to provide high-efficiency, load-flexible power generation. To study the FC-FPGT system, a MATLAB thermodynamic system-level model was developed. Using this model, the effect of the subsystem and total compression ratios of the FPGT on the overall hybrid system efficiency was studied. When the FC electrical efficiency was 65%, the highest overall FC-FPGT efficiency was found to be 59.4% without the use of an exhaust heat recovery system.

Date: 2021
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DOI: 10.1016/j.apenergy.2020.116242

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