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International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Solid Oxide Fuel Cell and Micro Gas Turbine Hybrid Cycle and related Fluid Flow and Heat Transfer

Kenjiro Suzuki
Department of Mechanical Engineering, Kyoto University, Kyoto; Department of Machinery and Control Systems, Shibaura Institute of Technology, 307 Fukasaku, Saitama, 337-8570, Japan

Hiroshi Iwai
Department of Mechanical Engineering, Department of Aeronautics and Astronautics, Kyoto University, Nishikyo-ku, Kyoto 615-8540, Japan

Jae Hwan Kim
Department of Mechanical Engineering, Kyoto University Kyoto 606-8501, Japan

Pei-Wen Li
Department of Mechanical Engineering, Kyoto University Kyoto 606-8501, Japan

Kiyomi Teshima
Department of Mechanical Engineering, Kyoto University Kyoto 606-8501, Japan

DOI: 10.1615/IHTC12.3400
12 pages

Abstract

Hybrid cycle fusing Solid Oxide Fuel Cell (SOFC) with Micro Gas Turbine (MGT) is promising for a distributed electricity generation system. Main portion of electricity is generated with SOFC and additional portion of electricity is generated with MGT. Electricity generation efficiency of the system can be higher than 60% and its total energy utilization efficiency can be raised as high as 80% if a thermal energy recovery system like absorption refrigerator is connected to the hybrid system as its bottoming. Electro-chemical process proceeds in SOFC together with thermodynamic and electric heat generation. Involved heat and mass transfer is a sophisticated but physically interesting problem. Combustor to be mounted after the SOFC burns unreacted portion of fuel remaining in the high temperature effluent from SOFC and reduces poisonous or toxic chemical species like carbon monoxide. Flame stability must thus be the first importance of the combustor. Burned gas is expanded in MGT to generate electricity. Gas flow in MGT behaves differently from the counterpart of large scale gas turbines because of its small size and high rotational speed. Recuperator is a very important element in the regenerative MGT to secure high electricity generation efficiency. All these fluid flow and heat transfer studies will briefly be scanned in this review together with the description of the results of system efficiency analysis.

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