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Research Papers: Gas Turbines: Cycle Innovations

Reheat Air-Brayton Combined Cycle Power Conversion Off-Nominal and Transient Performance

[+] Author and Article Information
Charalampos Andreades

University of California-Berkeley,
4118 Etcheverry Hall,
Berkeley, CA 94720
e-mail: charalampos@berkeley.edu

Lindsay Dempsey

Generation Solutions Ltd.,
P.O. Box 24674,
Royal Oak,
Auckland 1345, New Zealand
e-mail: Lindsay.Dempsey@GenerationSolutions.co.nz

Per F. Peterson

Mem. ASME
University of California-Berkeley,
4167 Etcheverry Hall,
Berkeley, CA 94720
e-mail: peterson@nuc.berkeley.edu

Contributed by the Cycle Innovations Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received January 9, 2014; final manuscript received January 12, 2014; published online February 20, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(7), 071703 (Feb 20, 2014) (11 pages) Paper No: GTP-14-1012; doi: 10.1115/1.4026612 History: Received January 09, 2014; Revised January 12, 2014

Because molten fluoride salts can deliver heat at temperatures above 600 °C, they can be used to couple nuclear and concentrating solar power heat sources to reheat air combined cycles (RACC). With the open-air configuration used in RACC power conversion, the ability to also inject natural gas or other fuel to boost power at times of high demand provides the electric grid with contingency and flexible capacity while also increasing revenues for the operator. This combination provides several distinct benefits over conventional stand-alone nuclear power plants and natural gas combined cycle and peaking plants. A companion paper discusses the necessary modifications and issues for coupling an external heat source to a conventional gas turbine and provides two baseline designs (derived from the GE 7FB and Alstom GT24). This paper discusses off-nominal operation, transient response, and start-up and shutdown using the GE 7FB gas turbine as the reference design.

Copyright © 2014 by ASME
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References

Andreades, C., Scarlat, R., Dempsey, L., and Peterson, P., “Reheat Air-Brayton Combined Cycle (RACC) Power Conversion Design and Performance Under Nominal Ambient Conditions,” ASME J. Eng. Gas Turbines Power (in press). [CrossRef]
Walsh, P., and Fletcher, P., 2004, Gas Turbine Performance, 2nd ed., Wiley, New York.
Boyce, M. P., 2011, Gas Turbine Engineering Handbook, 4th ed., Elsevier, New York.
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Jolly, S., and Cloyd, S., 2003, “Performance Enhancement of GT 24 With Wet Compression,” Power-Gen International, Las Vegas, NV, December 9–11.
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Thermoflow, 2013, “Thermoflow,” Thermoflow Inc., Southborough, MA, http://www.thermoflow.com
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GE Power Systems, 1998, “Variable Inlet Guide Vane System, GEK 106910A,” General Electric, Schenectady, NY.
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Figures

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Fig. 1

Reference ThermoFlex® power conversion system flow diagram for base-load, 15 °C nominal ambient conditions

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Fig. 2

ThermoFlex® power conversion system flow diagram for 0 °C cold ambient conditions with stack recirculation

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Fig. 3

ThermoFlex® power conversion system flow diagram for 40 °C warm ambient conditions with compressor inlet fogging

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Fig. 4

Net FHR thermal power at different ambients, with and without GT inlet control

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Fig. 5

LP/HP CTAH heat transfer ratio at different ambients, with and without GT inlet control

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Fig. 6

Net baseload electrical power at different ambients, with and without GT inlet control

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Fig. 7

Net baseload efficiency at different ambients, with and without GT inlet control

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Fig. 8

Net cofiring electrical power at different ambients, with and without GT inlet control

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Fig. 9

Net cofiring efficiency at different ambients, with and without GT inlet control

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Fig. 10

Net power (baseload, BL, and cofired, CF) at varying ambient conditions for 0 m and 1625 m elevations

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Fig. 11

Efficiency (baseload, BL, and cofired, CF) at varying ambient conditions for 0 m and 1625 m elevations

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Fig. 12

Relative CTAH sizes at varying ambient conditions for 0 m and 1625 m elevations

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Fig. 13

Core thermal power at varying ambient conditions for 0 m and 1625 m elevations

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Fig. 14

ThermoFlex® power conversion system flow diagram for start-up

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Fig. 15

Net shaft power versus shaft speed

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Fig. 16

Normalized start-up parameters versus shaft speed

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