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TECHNICAL PAPERS: Gas Turbines: Cycle Innovations

Safe Dynamic Operation of a Simple SOFC/GT Hybrid System

[+] Author and Article Information
Christoph Stiller

Department of Energy and Process Engineering, The Norwegian University of Science and Technology, Kolbjørn Hejes vei 1B, N-7491 Trondheim, Norwaychristoph.stiller@ntnu.no

Bjørn Thorud, Olav Bolland

Department of Energy and Process Engineering, The Norwegian University of Science and Technology, Kolbjørn Hejes vei 1B, N-7491 Trondheim, Norway

J. Eng. Gas Turbines Power 128(3), 551-559 (Sep 06, 2005) (9 pages) doi:10.1115/1.2132385 History: Received August 30, 2005; Revised September 06, 2005

The current work shall prove the feasibility and show methods to safely operate a simple SOFC/GT hybrid system under part-load and load change. Dynamic and steady state studies on a detailed model of a SOFC/GT hybrid system have been performed. A design point is selected. Steady-state part-load behavior is shown by means of performance maps. An operation line with fairly constant temperatures in the upper part-load regime and an almost constant efficiency down to approximately 25% part-load is proposed and the dynamic behavior of the system on rapid load changes is investigated. Strategies for the dynamic controlling of power by manipulating fuel flow are shown that might enable the system to adapt to a new setpoint power quite quickly.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cycle layout and design point values (square-marked values remain always constant)

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Figure 2

Power parameters (left) and turbomachinery parameters (right) in steady state

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Figure 3

Significant temperatures (left) and steam to carbon ratio and SOFC temperature gradients (right) in steady state

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Figure 4

Load change between 24% and 100% (left: decrease; right: increase)

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Figure 5

Burner fuel flow at different speed change rates

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Figure 6

Control strategies for fuel flow

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Figure 7

Break down of the cell geometry

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Figure 8

Normalized compressor map

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Figure 9

Normalized turbine map

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