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RESEARCH PAPERS

Thermo-Economic Optimization of a Solid Oxide Fuel Cell, Gas Turbine Hybrid System

[+] Author and Article Information
N. Autissier1

 Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratory for Industrial Energy Systems (LENI), CH-1015 Lausanne, Switzerlandnordahl.autissier@epfl.ch

F. Palazzi, F. Marechal, J. van Herle, D. Favrat

 Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratory for Industrial Energy Systems (LENI), CH-1015 Lausanne, Switzerland

1

Corresponding author.

J. Fuel Cell Sci. Technol 4(2), 123-129 (Jun 15, 2006) (7 pages) doi:10.1115/1.2714564 History: Received December 07, 2005; Revised June 15, 2006

Large scale power production benefits from the high efficiency of gas-steam combined cycles. In the lower power range, fuel cells are a good candidate to combine with gas turbines. Such systems can achieve efficiencies exceeding 60%. High-temperature solid oxide fuel cells (SOFC) offer good opportunities for this coupling. In this paper, a systematic method to select a design according to user specifications is presented. The most attractive configurations of this technology coupling are identified using a thermo-economic multi-objective optimization approach. The SOFC model includes detailed computation of losses of the electrodes and thermal management. The system is integrated using pinch based methods. A thermo-economic approach is then used to compute the integrated system performances, size, and cost. This allows to perform the optimization of the system with regard to two objectives: minimize the specific cost and maximize the efficiency. Optimization results prove the existence of designs with costs from 2400$kW for a 44% efficiency to 6700$kW for a 70% efficiency. Several design options are analyzed regarding, among others, fuel processing, pressure ratio, or turbine inlet temperature. The model of a pressurized SOFC–μGT hybrid cycle combines a state-of-the-art planar SOFC with a high-speed micro-gas turbine sustained by air bearings.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

System model structure

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Figure 2

System flowsheet with decision variables used for optimization

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Figure 3

nsds diagram for single stage compressor from Balje (13)

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Figure 4

Hot and cold composite curve

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Figure 5

Efficiency versus system cost

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Figure 6

Efficiency versus fuel utilization

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Figure 7

Efficiency versus steam to carbon ratio

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Figure 8

Efficiency versus current density

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Figure 9

Efficiency versus cell potential

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Figure 10

Efficiency versus electricity from mechanical power

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Figure 11

Efficiency versus air excess ratio

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Figure 12

Efficiency versus heat exchanger cost

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Figure 13

Composite curves cluster 3 η=70%, corrected by minimum ΔT

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Figure 14

Composite curves cluster 1 η=69%, corrected by minimum ΔT

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