Research Paper: Gas Turbines: Industrial & Cogeneration

Reheat-Air Brayton Combined Cycle Power Conversion Design and Performance Under Nominal Ambient Conditions

[+] Author and Article Information
Charalampos Andreades

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

Raluca O. Scarlat

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

Lindsay Dempsey

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

Per Peterson

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

1Corresponding author.

Contributed by the Industrial and Cogeneration Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 20, 2013; final manuscript received January 11, 2014; published online February 11, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(6), 062001 (Feb 11, 2014) (12 pages) Paper No: GTP-13-1458; doi: 10.1115/1.4026506 History: Received December 20, 2013; Revised January 11, 2014

Modern large air Brayton gas turbines have compression ratios ranging from 15 to 40 resulting in compressor outlet temperatures ranging from 350 °C to 580 °C. Fluoride-salt-cooled, high-temperature reactors, molten salt reactors, and concentrating solar power can deliver heat at temperatures above these outlet temperatures. This article presents an approach to use these low-carbon energy sources with a reheat-air Brayton combined cycle (RACC) power conversion system that would use existing gas turbine technology modified to introduce external air heating and one or more stages of reheat, coupled to a heat recovery steam generator to produce bottoming power or process heat. Injection of fuel downstream of the last reheat stage is shown to enable the flexible production of additional peaking power. This article presents basic configuration options for RACC power conversion, two reference designs based upon existing Alstom and GE gas turbine compressors and performance of the reference designs under nominal ambient conditions. A companion article studies RACC start up, transients, and operation under off-nominal ambient conditions.

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Fig. 1

Schematic for an RACC power conversion system with a single stage of reheat

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Fig. 2

Compressor air outlet temperature as a function of inlet temperature and compression ratio for a modern, large, high efficiency (89.4%) axial compressor

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Fig. 3

Computer-aided-design rendering of a baseline GE 7FB gas turbine modified to introduce external air heating and reheating, with cofiring

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Fig. 4

Potential FHR plant layout

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Fig. 5

CTAH elevation and plan views, taken from the Gilli et al. patent [17]

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Fig. 6

113-MWe Alstom GT11N2 gas turbine with an external silo combustor [20]

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Fig. 7

Base-load 100-MWe THERMOFLEX® power conversion system flow diagram

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Fig. 8

Peaking 241-MWe THERMOFLEX® power conversion system flow diagram

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Fig. 9

Net efficiency versus ER for GE 7FB baseline

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Fig. 10

Power versus ER for GE 7FB baseline

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Fig. 11

CTAH Size versus ER for GE 7FB baseline

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Fig. 12

NACC T-s Diagram for GE 7FB baseline

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Fig. 13

LP pressure losses versus net power

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Fig. 14

LP pressure losses versus net efficiency



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