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Research Papers

Thermoeconomic Modeling and Parametric Study of Hybrid Solid Oxide Fuel Cell-Gas Turbine-Steam Turbine Power Plants Ranging From 1.5MWeto10MWe

[+] Author and Article Information
Alexandros Arsalis

Center for Energy Systems Research, Department of Mechanical Engineering 0238, Virginia Polytechnic Institute and  State University, Blacksburg, VA 24061alexarsalis@gmail.com

Michael R. von Spakovsky

Center for Energy Systems Research, Department of Mechanical Engineering 0238, Virginia Polytechnic Institute and  State University, Blacksburg, VA 24061vonspako@vt.edu

Francesco Calise

DETEC, Università degli Studi di Napoli Federico II, P.le Tecchio, 80-80125 Naples, Italyfrcalise@unina.it

J. Fuel Cell Sci. Technol 6(1), 011015 (Nov 10, 2008) (12 pages) doi:10.1115/1.2971127 History: Received June 13, 2007; Revised December 03, 2007; Published November 10, 2008

Detailed thermodynamic, kinetic, geometric, and cost models are developed, implemented, and validated for the synthesis/design and operational analysis of hybrid solid oxide fuel cell (SOFC)-gas turbine-steam turbine systems ranging in size from 1.5MWeto10MWe. The fuel cell model used in this research work is based on a tubular Siemens-Westinghouse-type SOFC, which is integrated with a gas turbine and a heat recovery steam generator (HRSG) integrated in turn with a steam turbine cycle. The current work considers the possible benefits of using the exhaust gases in a HRSG in order to produce steam, which drives a steam turbine for additional power output. Four different steam turbine cycles are considered in this research work: a single-pressure, a dual-pressure, a triple-pressure, and a triple-pressure with reheat. The models have been developed to function both at design (full load) and off-design (partial load) conditions. In addition, different solid oxide fuel cell sizes are examined to assure a proper selection of SOFC size based on efficiency or cost. The thermoeconomic analysis includes cost functions developed specifically for the different system and component sizes (capacities) analyzed. A parametric study is used to determine the most viable system/component syntheses/designs based on maximizing the total system efficiency or minimizing the total system life cycle cost.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

SOFC-GT integrated with a triple pressure with reheat ST cycle

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Figure 2

Optimizing variables versus objective functions for the 10MWe triple-pressure w/ RH ST small SOFC

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Figure 3

Optimizing variables versus objective functions for the 10MWe triple-pressure w/ RH ST large SOFC

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Figure 4

Cost breakdown for all optimal configurations

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Figure 5

Efficiency breakdown for all optimal configurations

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