Exergy analysis of the woody biomass Stirling engine and PEM-FC combined system with exhaust heat reforming

The woody biomass Stirling engine (WB-SEG) is an external combustion engine that outputs high-temperature exhaust gases. It is necessary to improve the exergy efficiency of WB-SEG from the viewpoint of energy cascade utilization. So, a combined system that uses the exhaust heat of WB-SEG for the ste...

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Bibliographic Details
Published inInternational journal of hydrogen energy Vol. 33; no. 9; pp. 2289 - 2299
Main Authors Obara, Shin’ya, Tanno, Itaru, Kito, Shunsuke, Hoshi, Akira, Sasaki, Seizi
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.05.2008
Elsevier
Subjects
Applied sciences
Biomass
Combined cycle
Distributed power supply
Energy
Energy. Thermal use of fuels
Engines and turbines
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Exergy analysis
Exhaust heat reforming
Fuel cells
PEM fuel cell
Stirling cycle
Distributed power supply
Stirling cycle
Combined cycle
Exergy analysis
Exhaust heat reforming
Biomass
PEM fuel cell
Energy balance
Stirling engine
Exergy analysis,Stirling cycle,Distributed power supply,PEM fuel cell,Biomass,Combined cycle,Exhaust heat reforming
External combustion engine
Combustion
Steam reforming
Performance
Proton exchange membrane fuel cells
Heat recovery
Heat transfer
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Summary:The woody biomass Stirling engine (WB-SEG) is an external combustion engine that outputs high-temperature exhaust gases. It is necessary to improve the exergy efficiency of WB-SEG from the viewpoint of energy cascade utilization. So, a combined system that uses the exhaust heat of WB-SEG for the steam reforming of city gas and that supplies the produced reformed gas to a proton exchange membrane fuel cell (PEM-FC) is proposed. The energy flow and the exergy flow were analyzed for each WB-SEG, PEM-FC, and WB-SEG/PEM-FC combined system. Exhaust heat recovery to preheat fuel and combustion air was investigated in each system. As a result, (a) improvement of the heat exchange performance of the woody biomass combustion gas and engine is observed, (b) reduction in difference in the reaction temperature of each unit, and (c) removal of rapid temperature change of reformed gas are required in order to reduce exergy loss of the system. The exergy efficiency of the WB-SEG/PEM-FC combined system is superior to EM-FC.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2008.02.035