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Research Papers: Gas Turbines: Cycle Innovations

Steady State Off-Design and Transient Behavior of a Solid Oxide Fuel Cell/Gas Turbine Hybrid Power Plant With Additional Firing of the Gas Turbine Combustor

[+] Author and Article Information
Christian Wächter

Power Engineering Laboratory of Turbomachinery, Helmut-Schmidt-University (University of the Federal Armed Forces Hamburg), Holstenhofweg 85, D-22043 Hamburg, Germanywaechter@hsu-hh.de

Franz Joos

Power Engineering Laboratory of Turbomachinery, Helmut-Schmidt-University (University of the Federal Armed Forces Hamburg), Holstenhofweg 85, D-22043 Hamburg, Germanyjoos@hsu-hh.de

J. Eng. Gas Turbines Power 131(3), 031701 (Jan 29, 2009) (9 pages) doi:10.1115/1.2981176 History: Received March 28, 2008; Revised May 18, 2008; Published January 29, 2009

The purpose of the current work is to analyze and also to verify the operating behavior of a solid oxide fuel cell/gas turbine (GT) hybrid system in order to derive necessary requirements for an appropriate control system. The studies are carried out with a control oriented simplified dynamic model of a 25MWe hybrid system based on a conceptual design previously presented in literature. As a specific feature additional firing of the GT combustor is investigated. First the design point is defined. Then the off-design performance is presented in terms of characteristic performance maps. Based on operating map investigations an appropriate part-load operating curve is defined with considerations given to constraints (e.g., stack temperature or surge margin), efficiency, and operational flexibility. The load range goes from 40% part-load to 105% overload. To investigate the transient behavior five open loop simulations are carried out changing different model inputs, as well as all model inputs applying a 30% load change according to the operating curve. The simulated behavior reveals that the inputs should be changed with specific care to avoid critical situations during load change.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Hybrid system configuration with design point data (for one power block)

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Figure 2

Information flow of the model

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Figure 3

Steady state performance parameters for (a) TIT=1433 K (left) and (b) 1183 K (right)

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Figure 4

Meaningful temperatures, STCR, and AU for (a) TIT=1433 K (left) and (b) 1183 K (right)

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Figure 5

Turbomachinery parameters: differential pressure for (a) TIT=1433 K (left) and (b) 1183 K (right).

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Figure 6

Definition of the operating curve

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Figure 7

Actuating values on the operating curve

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Figure 8

Additional significant parameters

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Figure 9

Temperatures during load decrease (100%→70%)

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Figure 10

Power and critical parameters during load decrease (100%→70%)

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Figure 11

(a) Mass flows, (b) pressures, and (c) heat balances during load decrease (100%→70%)

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