Parameter Optimization on Combined Gas Turbine-Fuel Cell Power Plants

[+] Author and Article Information
Rainer Kurz

 Solar Turbines Incorporated, 9330 Skypark Ct., San Diego, CA 92123kurẕraineṟx@solarturbines.com

J. Fuel Cell Sci. Technol 2(4), 268-273 (Mar 28, 2005) (6 pages) doi:10.1115/1.2041669 History: Received January 03, 2005; Revised March 28, 2005

A thermodynamic model for a gas turbine-fuel cell hybrid is created and described in the paper. The effects of gas turbine design parameters such as compressor pressure ratio, compressor efficiency, turbine efficiency, and mass flow are considered. The model allows to simulate the effects of fuel cell design parameters such as operating temperature, pressure, fuel utilization, and current density on the cycle efficiency. This paper discusses, based on a parametric study, optimum design parameters for a hybrid gas turbine. Because it is desirable to use existing gas turbine designs for the hybrids, the requirements for this hybridization are considered. Based on performance data for a typical 1600hp industrial single shaft gas turbine, a model to predict the off-design performance is developed. In the paper, two complementary studies are performed: The first study attempts to determine the range of cycle parameters that will lead to a reasonable cycle efficiency. Next, an existing gas turbine, that fits into the previously established range of parameters, will be studied in more detail. Conclusions from this paper include the feasibility of using existing gas turbine designs for the proposed cycle.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Gas turbine-fuel cell hybrid

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Figure 2

Effect of cycle pressure ratio on power density and efficiency

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Figure 3

Sensitivity of power and efficiency on a 1% reduction in (1) compressor efficiency, (2) turbine efficiency, (3) compressor pressure ratio, (4) fuel cell efficiency, (5) recuperator effectiveness

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Figure 4

Effect of ambient temperature on cycle efficiency and power output comparison between GT-FC hybrid and simple cycle GT

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Figure 5

Part load performance of a fuel cell—gas turbine hybrid with and without bleed



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