Research Papers: Gas Turbines: Cycle Innovations

Off-Nominal Component Performance in a Supercritical Carbon Dioxide Brayton Cycle

[+] Author and Article Information
Eric M. Clementoni

Bechtel Marine Propulsion Corporation,
West Mifflin, PA 15122
e-mail: Eric.Clementoni@unnpp.gov

Timothy L. Cox

Bechtel Marine Propulsion Corporation,
West Mifflin, PA 15122
e-mail: Timothy.Cox@unnpp.gov

Martha A. King

Bechtel Marine Propulsion Corporation,
West Mifflin, PA 15122
e-mail: Martha.King@unnpp.gov

1Corresponding author.

Contributed by the IGTI Supercritical CO2 Power Cycles Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 13, 2015; final manuscript received July 20, 2015; published online August 25, 2015. Editor: David Wisler. The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States government purposes.

J. Eng. Gas Turbines Power 138(1), 011703 (Aug 25, 2015) (8 pages) Paper No: GTP-15-1274; doi: 10.1115/1.4031182 History: Received July 13, 2015; Revised July 20, 2015

Bechtel Marine Propulsion Corporation (BMPC) is testing a supercritical carbon dioxide (sCO2) Brayton system at the Bettis Atomic Power Laboratory. The integrated system test (IST) is a simple recuperated closed Brayton cycle with a variable-speed turbine-driven compressor and a constant-speed turbine-driven generator using sCO2 as the working fluid designed to output 100 kWe. The main focus of the IST is to demonstrate operational, control, and performance characteristics of an sCO2 Brayton power cycle over a wide range of conditions. Therefore, the IST was designed to operate in a configuration and at conditions that support demonstrating the controllability of the closed sCO2 Brayton cycle. Operating at high system efficiency and meeting a specified efficiency target are not requirements of the IST. However, efficiency is a primary driver for many commercial applications of sCO2 power cycles. This paper uses operational data to evaluate component off-nominal performance and predict that design system operation would be achievable.

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Fig. 1

Cycle thermal efficiency as a function of heat source temperature [1]

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Fig. 2

Simple recuperated Brayton cycle

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Fig. 3

IST design full power heat balance

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Fig. 4

IST component arrangement

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Fig. 5

IST physical layout

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Fig. 6

Density variation near the critical point

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Fig. 7

IST turbomachinery internals

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Fig. 8

Heat balance for peak operating condition

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Fig. 9

Generator turbine performance map

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Fig. 10

Compressor turbine performance map

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Fig. 11

Compressor performance map

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Fig. 12

Turbomachinery windage

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Fig. 13

Recuperator effectiveness

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Fig. 14

System pressure losses




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