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Research Paper

Electrochemical and Exergetic Modeling of a Combined Heat and Power System Using Tubular Solid Oxide Fuel Cell and Mini Gas Turbine

[+] Author and Article Information
M. Y. Abdollahzadeh Jamalabadi

Chabahar Maritime University,
Chabahar, Siatan & Baloochestan 19395-1999, Iran
e-mail: muhammad_yaghoob@yahoo.com;
my.abdollahzadeh@cmu.ac.ir

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received February 12, 2013; final manuscript received July 7, 2013; published online August 20, 2013. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 10(5), 051007 (Aug 20, 2013) (13 pages) Paper No: FC-13-1039; doi: 10.1115/1.4025053 History: Received February 12, 2013; Revised July 07, 2013

In this article, a combined heat and power (CHP) system using a solid oxide fuel cell and mini gas turbine is introduced. Since a fuel cell is the main power generating source in hybrid systems, in this investigation, complete electrochemical and thermal calculations in the fuel cell are carried out in order to obtain more accurate results. An examination of the hybrid system performance indicates that increasing of the working pressure and rate of air flow into the system, cause the cell temperature to reduce, the efficiency and the power generated by the system to diminish, and the entropy generation rate and exergy destruction rate to increase. On the other hand, increasing the flow rate of the incoming fuel, the rise in cell temperature causes the efficiency, generated power, and exergy destruction rate of the system to increase.

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Figures

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Fig. 1

Schematic of SOFC-MGT system

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Fig. 2

Flow chart of SOFC modeling

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Fig. 3

Flow chart of SOFC-MGT modeling

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Fig. 4

Comparison of experimental data and present model results for cell power

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Fig. 6

Variations of turbine inlet temperature with system compression ratio for different air to fuel ratios

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Fig. 7

Effect of system compression ratio on electrical efficiency for different air to fuel ratios

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Fig. 8

Effect of system compression ratio on SOFC-MGT power output for different air to fuel ratios

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Fig. 5

Variations of SOFC stack temperature with system compression ratio for different air to fuel ratios

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Fig. 9

Variations of exergy destruction rate with system compression ratio for different air to fuel ratios

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Fig. 10

Variations of SOFC stack temperature with air flow rate for different cell pressures

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Fig. 11

Variations of turbine inlet temperature with air flow rate for different cell pressures

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Fig. 14

Variations of exergy destruction rate with air flow rate for different cell pressures

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Fig. 12

Effect of air flow rate on electrical efficiency for different cell pressures

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Fig. 13

Effect of air flow rate on SOFC-MGT power output for different cell pressures

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Fig. 19

Variations of exergy destruction rate with fuel flow rate for different cell pressures

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Fig. 15

Variations of SOFC stack temperature with fuel flow rate for different cell pressures

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Fig. 16

Variations of turbine inlet temperature with fuel flow rate for different cell pressures

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Fig. 17

Effect of fuel flow rate on electrical efficiency for different cell pressures

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Fig. 18

Effect of fuel flow rate on SOFC-MGT power output for different cell pressures

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