Thesis
Steady state modeling and analysis of a de-coupled fuel cell - gas turbine hybrid for clean power production
Washington State University
Master of Science (MS), Washington State University
2017
Handle:
https://hdl.handle.net/2376/102179
Abstract
This thesis introduces a de-coupled fuel cell-gas turbine hybrid arrangement that removes the fuel cell stack from the turbine working fluid, retains the high efficiency thermal integration of a topping cycle, and does not employ the high temperature heat exchangers of a bottoming cycle. The distinguishing feature of the system is the solid-state oxygen transport membrane used to create a secondary oxidant stream without significantly affecting turbomachinery performance. The secondary oxidant stream is re-pressurized and diverted to a solid oxide fuel cell. Excess hydrogen from the fuel cell supplies the combustor, which heats the oxygen-depleted air and drives the turbomachinery. The fuel cell operates in a thermally sustaining condition with direct and indirect fuel reforming providing the thermal management. Thermodynamic models developed in the Clean Energy Systems Integration Lab (CESI) at Washington State University identified the design conditions and characterized the system performance within the design space. Analysis indicates greater than 75% fuel-to-electric efficiency is achievable, with higher efficiency possible through co-production of hydrogen. The potential to retrofit existing turbine systems, particularly micro-turbines and stand-by 'peaker' plants, with minimal impact to compressor stability or transient response is a promising pathway to hybrid fuel cell/turbine development that does not require bespoke turbomachinery design. Economic analysis of the developed system showed its potential to compete in the power energy market as an alternative power generation device.
Metrics
12 File views/ downloads
23 Record Views
Details
- Title
- Steady state modeling and analysis of a de-coupled fuel cell - gas turbine hybrid for clean power production
- Creators
- Garrett Scott Hedberg
- Contributors
- Dustin F. McLarty (Chair)Cecilia D Richards (Committee Member) - Washington State University, Mechanical and Materials Engineering, School ofJacob W Leachman (Committee Member) - Washington State University, Mechanical and Materials Engineering, School of
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525397501842
- Language
- English
- Resource Type
- Thesis