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RESEARCH PAPERS

Influences of The Type and Thickness of Electrolyte on Solid Oxide Fuel Cell Hybrid System Performance

[+] Author and Article Information
Jaroslaw Milewski

Institute of Heat Engineering, Warsaw University of Technology, Warsaw, 00-665, Polandmilewski@itc.pw.edu.pl

Andrzej Miller

Institute of Heat Engineering, Warsaw University of Technology, Warsaw, 00-665, Polandmiller@itc.pw.edu.pl

J. Fuel Cell Sci. Technol 3(4), 396-402 (Mar 07, 2006) (7 pages) doi:10.1115/1.2349519 History: Received November 29, 2005; Revised March 07, 2006

This paper sets out the results of mathematical modeling and numerical simulations with regard to the influences of the type and thickness of electrolyte on Solid Oxide Fuel Cell Hybrid System (SOFC-HS) performance. A change of electrolyte materials can result in total hybrid system efficiency increasing from around 48% HHV (53% LHV) to about 65% HHV (72% LHV) in an environment where turbine inlet temperature and gas turbine subsystem pressure ratio remain unchanged. The governing equations of SOFC-HS modeling are given. An adequate simulator of the SOFC stack was made and described. Based on this simulator, a model of the 260kWe Siemens Westinghouse unit was built. The performance of this SOFC-HS with different electrolyte materials and thicknesses is shown, and some characteristics are given and described. The advantages and disadvantages of different electrolyte types from a hybrid system performance point of view are indicated.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic diagram of a tubular cell (3)

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Figure 2

300kWe PSOFC/MTG power system cycle (4)

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Figure 3

Scheme of simulator of PSOFC/MTG power system cycle

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Figure 4

SOFC Module by Siemens-Westinghouse Power Corporation (7)

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Figure 5

Minimum temperature and required ratio of steam-to-carbon (s/c) above which no carbon deposition takes place (10)

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Figure 6

Cell, stack, and SOFC Module (7)

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Figure 7

Equivalent electric circuit of the cell (13-14)

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Figure 8

Temperature dependence of electrical conductivity for oxide ion conductors (high temperature range) (5)

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Figure 9

Influence of ZrO2∕Y2O3 thickness on hybrid system efficiency and electrolyte temperature; s/c ratio=3.2, TIT=793°C; re-cycle ratio=0.7

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Figure 10

Influence of ZrO2∕CaO thickness on hybrid system efficiency and electrolyte temperature; s/c ratio=3.2, TIT=793°C; re-cycle ratio=0.7

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Figure 11

Influence of Zr2∕Sc2O3 thickness on hybrid system efficiency and electrolyte temperature; s/c ratio=3.2, TIT=793°C; re-cycle ratio=0.7

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Figure 12

Influence of Bi2O2∕Y2O3 thickness on hybrid system efficiency and electrolyte temperature; s/c ratio=3.2, TIT=793°C; re-cycle ratio=0.7

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Figure 13

Influence of Ce2∕GdO0.5 thickness on hybrid system efficiency and electrolyte temperature; s/c ratio=3.2, TIT=793°C, re-cycle ratio=0.7

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Figure 14

Influence of type and thickness of electrolyte on SOFC hybrid system efficiency

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