The Naval Nuclear Laboratory is operated for the U.S. Department of Energy by Bechtel Marine Propulsion Corporation, a wholly owned subsidiary of Bechtel National, Inc. Effect of Compressor Inlet Temperature on Cycle Performance for a Supercritical Carbon Dioxide Brayton Cycle Jacqueline Lewis, Eric Clementoni, Tim Cox
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Compressor Inlet Temperature Presentationsco2symposium.com/papers2018/testing/026_Pres.pdf · • Same as first test with mass adjustments to maintain pressure • Evaluate performance
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Transcript
The Naval Nuclear Laboratory is operated for the U.S. Department of Energy by Bechtel Marine Propulsion Corporation,
a wholly owned subsidiary of Bechtel National, Inc.
Effect of Compressor Inlet Temperature
on Cycle Performance for a
Supercritical Carbon Dioxide Brayton Cycle
Jacqueline Lewis, Eric Clementoni, Tim Cox
Presentation Summary
• sCO2 Integrated System Test (IST) Overview
• IST System Control
• Test Configuration
• Compressor Inlet Pressure and Density Sensitivities
• Cycle Performance Sensitivities
• Compressor Performance
• Conclusions
2
IST Overview
• Simple recuperated Brayton cycle
• One variable speed turbine-compressor
• One constant speed turbine-generator
• Single recuperator
• Designed for 100 kWe at 570°F (299°C) and 75,000 rpm
• Intended to demonstrate operational control and performance characteristics during rapid transients between steady-state power levels
3
IST Physical Layout
4
IST Physical Layout
5
Normal System Control Overview
6
IHX
GenMot/
Gen
Pre
coo
ler
Recuperator
Load regulated to
maintain 60,000 rpm
shaft speed
No load
PI control
regulates
TC shaft
speed
TC speed
setpoint
function of
TG load
setpoint
T T C
Heater power controlled to maintain IHX outlet temperature setpoint
Precooler water flow controlled to maintain/adjust compressor
inlet temperature setpoint
Pressure not directly controlled but compressor inlet pressure is relatively