Research Papers

Conceptual Design and Performance Analysis of SOFC/Micro Gas Turbine Hybrid Distributed Energy System

[+] Author and Article Information
Zheng Dang

Department of Building Environment
and Energy Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China
e-mail: zdang@mail.xjtu.edu.cn

Hua Zhao

Hong Kong Huayi Design Consultants (S.Z) LTD,
Shenzhen, Guangdong 518031, China

Guang Xi

National Engineering Research Center
of Fluid Machinery and Compressors,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received October 30, 2014; final manuscript received November 15, 2014; published online January 28, 2015. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 12(3), 031003 (Jun 01, 2015) (5 pages) Paper No: FC-14-1132; doi: 10.1115/1.4029395 History: Received October 30, 2014; Revised November 15, 2014; Online January 28, 2015

A numerical model has been developed for the performance analysis of solid oxide fuel cell (SOFC)/micro gas turbine (MGT) hybrid systems with prereforming of natural gas, in which a quasi two-dimensional model has been built up to simulate the cell electrochemical reaction, heat and mass transfer within tubular SOFC. The developed model can be used not only to predict the overall performance of the SOFC/MGT hybrid system but also to reveal the nonuniform temperature distribution within SOFC unit. The effects of turbine inlet temperature (TIT) and pressure ratio (PR) on the performance of the hybrid system have been investigated. The results show that selecting smaller TIT or PR value will lead to relative higher system efficiency and lower CO2 emission ratio; however, this will raise the risk to destroy SOFC beyond the limitation temperature of electrolyte.

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Fig. 1

Schematic layout for SOFC/MGT hybrid system

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Fig. 2

Schematic layout for tubular SOFC

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Fig. 3

Control volume for energy conservation

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Fig. 4

Output power and cell voltage of SOFC/MGT hybrid system

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Fig. 5

Efficiency and emission ratio of CO2 of SOFC/MGT hybrid system

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Fig. 7

Electrolyte axial temperature distribution of tubular SOFC unit

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Fig. 8

Output power and cell voltage of SOFC/MGT hybrid system

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Fig. 9

Efficiency and emission ratio of CO2 of SOFC/MGT hybrid system

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Fig. 10

RR and the utilization ratio between CO and H2 (zCO/zH2)

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Fig. 11

Electrolyte axial temperature distribution of tubular SOFC unit



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