Research Papers: Gas Turbines: Microturbines and Small Turbomachinery

A Study in the Process Modeling of the Startup of Fuel Cell/Gas Turbine Hybrid Systems

[+] Author and Article Information
Michael Shelton

 Jacobs Engineering Group, Houston, TX 77072

Ismail Celik

 West Virginia University, Morgantown, WV 26505

Eric Liese, David Tucker

 National Energy Technology Laboratory, U.S. Department of Energy, Morgantown, WV 26507-0880

J. Eng. Gas Turbines Power 132(1), 012301 (Sep 10, 2009) (8 pages) doi:10.1115/1.2830551 History: Received October 28, 2005; Revised September 21, 2007; Published September 10, 2009

As energy demands increase and the associated costs increase with that demand, newer energy alternatives are becoming more important to society. Although not new, fuel cell technology is taking a lead role in the quest for a cleaner and competitive power generation system. High efficiencies on the order of 50% are now possible with stand-alone fuel cells. When coupled with a gas turbine, efficiencies of around 70% may be expected. However, the fuel cell/gas turbine hybrid has inherent problems of stability and unpredictable response to adverse transients that first must be addressed to make this technology viable. The National Energy Technology Laboratories (NETL) in Morgantown is involved in the development of such hybrid technology. This study details a process modeling approach based on a commercial modeling package, and is associated specifically with the NETL Hybrid Performance (HYPER) research effort. Simulation versus experimental test data are presented to validate the process model during the cold flow startup phase. The results provide insight into the transients of the system built at NETL.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

HYPER process flow diagram (PFD)

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Figure 2

The NETL HYPER model

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Figure 3

PROTRAX model process flow diagram (PFD) with initial process values

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Figure 4

PROTRAX model process flow diagram (PFD) with process node identifiers

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Figure 5

Three subsequent process runs to allow system cooling

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Figure 6

Blower discharge position

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Figure 7

Actual versus simulated blower discharge pressure

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Figure 8

Actual versus simulated plenum pressure

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Figure 9

Actual versus simulated mass flow rate

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Figure 10

Actual versus simulated turbine speed

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Figure 11

Simulated plenum temperature

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Figure 12

Simulated compressor outlet temperature

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Figure 13

Simulated temperature blower outlet

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Figure 14

Blower/compressor and system simulated mass flow

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Figure 15

Matched flow rate—mass flow

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Figure 16

Matched flow rate—turbine speed

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Figure 17

Matched flow—plenum pressure

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Figure 18

Matched flow—blower discharge pressure



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