Inlet Temperature Sensitivity Presentation · Presentation Summary ... Turbo-Generator...
Transcript of Inlet Temperature Sensitivity Presentation · Presentation Summary ... Turbo-Generator...
![Page 1: Inlet Temperature Sensitivity Presentation · Presentation Summary ... Turbo-Generator Turbo-Compressor Recuperator ... Microsoft PowerPoint - Inlet Temperature Sensitivity Presentation.pptx](https://reader030.fdocuments.in/reader030/viewer/2022013101/5adb46c27f8b9ae1768e4ba7/html5/thumbnails/1.jpg)
Page 1Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Sensitivity of an Operating
Supercritical Carbon Dioxide Brayton Cycle
to Compressor and Turbine Inlet Temperature
Eric Clementoni
Bechtel Marine Propulsion CorporationBettis Atomic Power LaboratoryWest Mifflin, PA
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Page 2Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Presentation Summary
• sCO2 Brayton Cycle Integrated Systems Test
(IST) Overview
• Compressor Inlet Temperature Sensitivity
– System Control
– Test Results
• Turbine Inlet Temperature Sensitivity
– System Control
– Test Results
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Page 3Supercritical CO2 Power Cycles Symposium March 29-31, 2016
• 100 kWe IST has been main sCO2 development
focus of BMPC
• Simple Brayton cycle
– Single variable speed turbine-compressor
– Single constant speed turbine-generator
– Single recuperator
• Focus on system control
– Rapid startup
– Power changes
– Shutdown
IST Overview
CompressorTurbine
Heat
Source
Generator Turbine
Recuperator
Precooler
Sea WaterCooling
Water
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Page 4Supercritical CO2 Power Cycles Symposium March 29-31, 2016
IST Physical Layout
Hot Oil System
Turbo-Generator
Turbo-Compressor
Recuperator
Precooler
Turbine Throttle Valves
Compressor Recirculation Valve
Leakage Collection Compressors
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Page 5Supercritical CO2 Power Cycles Symposium March 29-31, 2016
IST Physical Layout
Turbo-Generator
Recuperator
Precooler
Turbo-Compressor (not
visible)
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Page 6Supercritical CO2 Power Cycles Symposium March 29-31, 2016
IST Turbomachinery
Turbo-Generator
Turbo-Compressor
Compressor/Diffuser Turbine
Thrust Bearing
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Page 7Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Normal Thermal-Hydraulic Control
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
![Page 8: Inlet Temperature Sensitivity Presentation · Presentation Summary ... Turbo-Generator Turbo-Compressor Recuperator ... Microsoft PowerPoint - Inlet Temperature Sensitivity Presentation.pptx](https://reader030.fdocuments.in/reader030/viewer/2022013101/5adb46c27f8b9ae1768e4ba7/html5/thumbnails/8.jpg)
Page 8Supercritical CO2 Power Cycles Symposium March 29-31, 2016
IST Efficiency vs. Power
0.0%
1.0%
2.0%
3.0%
4.0%
5.0%
6.0%
7.0%
8.0%
0 5 10 15 20 25 30 35 40 45
Cy
cle
Eff
icie
ncy
Output Power (kW)
![Page 9: Inlet Temperature Sensitivity Presentation · Presentation Summary ... Turbo-Generator Turbo-Compressor Recuperator ... Microsoft PowerPoint - Inlet Temperature Sensitivity Presentation.pptx](https://reader030.fdocuments.in/reader030/viewer/2022013101/5adb46c27f8b9ae1768e4ba7/html5/thumbnails/9.jpg)
Page 9Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Compressor Inlet Temperature
Sensitivity Overview
IHX
GenMot/
Gen
Pre
coo
ler
Recuperator
Load regulated to
maintain 60,000 rpm
shaft speed
No load
PI control
maintains
TC shaft
speed at
setpoint
TC speed
setpoint
fixed at
48,670 rpm
T T CHeater power
automatically controlled
to maintain CO2 outlet
temperature of 440°F
System mass held constant,
compressor inlet pressure varies
based on system conditions
Chilled water flow
automatically controlled
to obtain desired
compressor inlet
temperature
Range: 90-102°F
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Page 10Supercritical CO2 Power Cycles Symposium March 29-31, 2016
39.5
40
40.5
41
41.5
42
42.5
43
43.5
44
44.5
0
200
400
600
800
1000
1200
1400
1600
1800
2000
90 92 94 96 98 100 102 104
Pre
ssu
re (
psi
a)
Compressor Inlet Temperature (F)
Compressor Inlet Pressure
Compressor Outlet Pressure
Compressor Inlet Density
De
nsi
ty (
lbm
/ft3
)
Compressor Inlet Conditions
Normal IST operating
conditions
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Page 11Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Compressor Flow & Brayton Power
0
5
10
15
20
25
30
90 92 94 96 98 100 102 104
Co
mp
ress
or
Flo
w (
lbm
/s)
or
Bra
yto
n O
utp
ut
Po
we
r (k
W)
Compressor Inlet Temperature (F)
Brayton Output Power
Compressor Flow
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Page 12Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Cycle Efficiency
5.0%
5.1%
5.2%
5.3%
5.4%
5.5%
5.6%
90 92 94 96 98 100 102 104
Bra
yto
n C
ycl
e E
ffic
ien
cy
Compressor Inlet Temperature (F)
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Page 13Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Cycle Efficiency
0.0%
1.0%
2.0%
3.0%
4.0%
5.0%
6.0%
7.0%
8.0%
0 5 10 15 20 25 30 35 40 45
Cy
cle
Eff
icie
ncy
Output Power (kW)
![Page 14: Inlet Temperature Sensitivity Presentation · Presentation Summary ... Turbo-Generator Turbo-Compressor Recuperator ... Microsoft PowerPoint - Inlet Temperature Sensitivity Presentation.pptx](https://reader030.fdocuments.in/reader030/viewer/2022013101/5adb46c27f8b9ae1768e4ba7/html5/thumbnails/14.jpg)
Page 14Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Cycle Efficiency
0.0%
1.0%
2.0%
3.0%
4.0%
5.0%
6.0%
7.0%
8.0%
0 5 10 15 20 25 30 35 40 45
Cy
cle
Eff
icie
ncy
Output Power (kW)
91°F103°F
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Page 15Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Turbine Inlet Temperature
Sensitivity Overview
IHX
GenMot/
Gen
Pre
coo
ler
Recuperator
Load regulated to
maintain 60,000 rpm
shaft speed
No load
Valve
position
fixed at
36% open
TC speed
varies with
turbine inlet
temperature
T T CHeater power
automatically controlled
to maintain CO2 outlet
temperature
Range: 390-440°F
System mass held constant,
compressor inlet pressure varies
based on system conditions
Chilled water flow
automatically controlled
to obtain desired
compressor inlet
temperature of 96°F
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Page 16Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Power and Compressor Speed
40000
42000
44000
46000
48000
50000
52000
0
5
10
15
20
25
30
380 390 400 410 420 430 440 450
Bra
yto
n O
utp
ut
Po
we
r (k
W)
Turbine Inlet Temperature (F)
Brayton Output Power
Compressor Speed
Co
mp
ress
or
Sp
ee
d (
rpm
)
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Page 17Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Cycle Efficiency
0.0%
1.0%
2.0%
3.0%
4.0%
5.0%
6.0%
7.0%
380 390 400 410 420 430 440 450
Bra
yto
n C
ycl
e E
ffic
ien
cy
Turbine Inlet Temperature (F)
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Page 18Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Cycle Efficiency
0.0%
1.0%
2.0%
3.0%
4.0%
5.0%
6.0%
7.0%
8.0%
0 5 10 15 20 25 30 35 40 45
Cy
cle
Eff
icie
ncy
Output Power (kW)
440°F
390°F
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Page 19Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Summary
• IST response to varying compressor and
turbine inlet temperatures consistent with
most expectations
– Cycle efficiency benefit from reducing compressor
inlet temperature diminished in a fixed mass
system
– Cycle efficiency vs. output power appears to not
be strongly influenced by turbine inlet
temperature
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Page 20Supercritical CO2 Power Cycles Symposium March 29-31, 2016
Acknowledgements
• This presentation summarizes work that has
been performed a number of devoted
engineers, scientists, technicians, and support
personnel at the Bechtel Marine Propulsion
Corporation and our subcontractors. This
paper would not be possible without the
efforts of this team.