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Research Papers

Safety Analysis of a Solid Oxide Fuel Cell/Gas Turbine Hybrid System Fueled With Gasified Biomass

[+] Author and Article Information
Xiaojing Lv, Chaohao Lu, Xinjian Zhu

School of Mechanical Engineering,
Key Laboratory of Power Machinery
and Engineering,
Ministry of Education,
Shanghai Jiao Tong University,
800 Dong Chuan Road,
Shanghai 200240, China

Yiwu Weng

School of Mechanical Engineering,
Key Laboratory of Power Machinery
and Engineering,
Ministry of Education,
Shanghai Jiao Tong University,
800 Dong Chuan Road,
Shanghai 200240, China
e-mail: ywweng@sjtu.edu.cn

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received September 30, 2014; final manuscript received November 3, 2014; published online December 11, 2014. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 12(1), 011008 (Feb 01, 2015) (6 pages) Paper No: FC-14-1118; doi: 10.1115/1.4029084 History: Received September 30, 2014; Revised November 03, 2014; Online December 11, 2014

The effect of biomass gas on the safety performance of a solid oxide fuel cell (SOFC)/micro gas turbine (GT) hybrid system was studied with consideration of the fuel cell working temperature, fuel cell temperature gradient requirement, compressor surge zone, and turbine inlet temperature (TIT). The safety performance of the hybrid system on the design condition and off-design condition was also analyzed. Results show that the hybrid system is good adaptability to low concentrations of biomass gas. The electrical efficiency could reach 50% with different biomass gases and is higher than the other combined power systems that used biomass gas. The wood chip gas (WCG) would make the fuel cell or GT easier overheat than the other three gases. The cotton wood gas (CWG) and corn stalk gas (CSG) are easy to cause the TIT too low or the compressor surge. In the safety zone, considering the hybrid system load adjustment range, the effecting order (from large to small, following is same) is WCG, grape seed gas (GSG), CSG, and CWG. Considering the hybrid system electric efficiency, the effecting order is WCG, GSG, CWG, and CSG.

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Figures

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Fig. 3

Turbine characteristic curve

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Fig. 2

Compressor characteristic curve

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Fig. 1

Schematic of SOFC-GT hybrid system

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Fig. 7

System output power and electrical efficiency variation with relative fuel flow

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Fig. 8

System relative output power and electrical efficiency

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Fig. 4

SOFC working temperature and temperature gradient variation with relative fuel flow

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Fig. 5

SOFC output voltage and power variation with relative fuel flow

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Fig. 6

TIT and surge margin variation with relative fuel flow

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