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Research Papers: Gas Turbines: Cycle Innovations

Startup and Operation of 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.contractor@unnpp.gov

Timothy L. Cox

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

Christopher P. Sprague

Bechtel Marine Propulsion Corporation,
West Mifflin, PA 15122
e-mail: Christopher.Sprague.contractor@unnpp.gov

1Corresponding author.

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 14, 2014; published online February 18, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(7), 071701 (Feb 18, 2014) (6 pages) Paper No: GTP-14-1010; doi: 10.1115/1.4026539 History: Received January 09, 2014; Revised January 14, 2014

Bechtel Marine Propulsion Corporation (BMPC) is testing a supercritical carbon dioxide (S-CO2) Brayton system at the Bettis Atomic Power Laboratory. The 100 kWe integrated system test (IST) is a two shaft recuperated closed Brayton cycle with a variable speed turbine driven compressor and a constant speed turbine driven generator using S-CO2 as the working fluid. The IST was designed to demonstrate operational, control, and performance characteristics of an S-CO2 Brayton power cycle over a wide range of conditions. Initial operation of the IST has proven a reliable method for startup of the Brayton loop and heatup to normal operating temperature (570 °F). An overview of the startup process, including initial loop fill and charging, and heatup to normal operating temperature is presented. Additionally, aspects of the IST startup process which are related to the loop size and component design which may be different for larger systems are discussed.

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References

Ashcroft, J. A., Kimball, K. J., and Corcoran, M. R., 2009, “Overview of Naval Reactors Program Development of the Supercritical Carbon Dioxide Brayton System,” Supercritical CO2 Power Cycle Symposium, Troy, NY, April 29–30.
Kimball, K. J., 2011, “Overview of Naval Reactors Program Development of the Supercritical Carbon Dioxide Brayton System,” Supercritical CO2 Power Cycle Symposium, Boulder, CO, May 24–25.
Kimball, K. J., and Clementoni, E. M., 2012, “Supercritical Carbon Dioxide Brayton Power Cycle Development Overview,” ASME Turbo Expo 2012, Copenhagen, Denmark, June 11–15, ASME Paper No. GT2012-68204. [CrossRef]
Hexemer, M. J., Hoang, H. T., Rahner, K. D., Siebert, B., and Wahl, G. D., 2009, “Integrated Systems Test (IST) S-CO2 Brayton Loop Transient Model Description and Initial Results,” Supercritical CO2 Power Cycle Symposium, Troy, NY, April 29–30.
Hexemer, M. J., 2011, “Supercritical CO2 Brayton Cycle Integrated System Test (IST) TRACE Model and Control System Design,” Supercritical CO2 Power Cycle Symposium, Boulder, CO, May 24–25.

Figures

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Fig. 1

Simple recuperated Brayton cycle

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Fig. 2

IST design full power heat balance

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Fig. 3

IST component arrangement

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Fig. 4

IST physical layout

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Fig. 5

IST turbomachinery internals

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Fig. 6

IST turbomachinery startup

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Fig. 7

IST loop mass flow rates during startup

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Fig. 8

IST loop pressure distribution during startup

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Fig. 9

Turbomachinery powers during heatup with both shafts at idle speed of 37,500 rpm

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Fig. 10

System heat balance at hot idle

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Fig. 11

Turbomachinery shutdown

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