ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES … · ASSESMENT OF SOLAR STEAM INJECTION IN GAS...
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ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea 1 ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES Laboratory of Thermal Turbomachines National Technical University of Athens C. Kalathakis Research Assistant Ν. Aretakis Assistant Professor Ι. Roumeliotis Assistant Professor Κ. Mathioudakis Professor Α. Alexiou Senior Researcher
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ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES
Laboratory of Thermal Turbomachines National Technical University of Athens
C. Kalathakis Research Assistant
Ν. Aretakis Assistant Professor
Ι. Roumeliotis Assistant Professor
Κ. Mathioudakis Professor
Α. Alexiou Senior Researcher
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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Generator
Heliostats
Receiver
Burner
Compressor Turbine
Heliostats
Receiver
Generator
Burner
Compressor Turbine
• Conventional hybridization
o Energy production penalty
o Air extraction difficulties
o Burner cooling difficulties
• Solar STIG
o Increased produced energy
o Fewer construction difficulties
o STIG: Used technology
o Solar steam: Used technology
Motivation & Objectives
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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MODELLING
SOLAR STEAM PRODUCTION METHOD
o Design Specifications & Operating Scenario
o Performance Simulation
SOLAR STEAM IN A STIG ENGINE
o Design Specifications & Operating Scenario
o Performance Simulation
o Change Of Operating Point
SUMMARY & CONCLUSIONS
Contents
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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MODELLING
SOLAR STEAM PRODUCTION METHOD
o Design Specifications & Operating Scenario
o Performance Simulation
SOLAR STEAM IN A STIG ENGINE
o Design Specifications & Operating Scenario
o Performance Simulation
o Change Of Operating Point
SUMMARY & CONCLUSIONS
Contents
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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Modeling • Modeling with PROOSIS: an object oriented environment • TURBO: Brayton cycle components • WAST: Rankine cycle components • SOLAR: Solar part components
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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Modeling
Solar-only STIG
Solar STIG with troughs
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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MODELLING
SOLAR STEAM PRODUCTION METHOD
o Design Specifications & Operating Scenario
o Performance Simulation
SOLAR STEAM IN A STIG ENGINE
o Design Specifications & Operating Scenario
o Performance Simulation
o Change Of Operating Point
SUMMARY & CONCLUSIONS
Contents
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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Heliostats
Receiver
Generator
Burner
Compressor Turbine
Generator
Burner
Compressor Turbine
Troughs
• Tower oDirect steam generation oEngine on tower oUsed technology for Rankine
cycles oHigher investment cost
• Troughs oDirect steam generation
experimental stage oEngine on ground oLower investment cost
Solar Steam Production Method
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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• Fuel-only engine: 5MW, TIT = 1000oC, PR = 10
• Solar field / Water-Steam
o Steam pressure: 35 bar
o Steam temperature: Saturated steam
o Receiver/troughs outlet: SAR=12% @ 800W/m2 Summer solstice
• Operating scenario
o Maximum power → TIT constant
o Yearly continuous baseload operation
• Performance simulation
o Hourly simulation → Integration → Annual performance
Design Specifications & Operating Scenario
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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• Tower less season-depended • Solar STIG results to o Augmented produced energy (higher mass flow, composition change) o Augmented fuel consumption (added mass with higher Cp)
Performance Simulation
-6 -2 2 6 10 14
ΔE
ΔFuel
Δeff_f
Difference [%]
Annual Performance Difference Between Solar-only STIG & Fuel-only Engines
Tower
Troughs
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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MODELLING
SOLAR STEAM PRODUCTION METHOD
o Design Specifications & Operating Scenario
o Performance Simulation
SOLAR STEAM IN A STIG ENGINE
o Design Specifications & Operating Scenario
o Performance Simulation
o Change Of Operating Point
SUMMARY & CONCLUSIONS
Contents
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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1. Fuel-only engine
2. Conventional STIG (+HRSG)
3. Solar STIG (+Solar evaporator)
Addition Of Solar Steam
Generator
Burner
Compressor Turbine
Heliostats
Receiver
Usual STIG
SupH Evap Econ
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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• Fuel-only engine: 5MW, TIT = 1000oC, PR = 10 • Heat Recovery Steam Generator o Inlet water: 35 bar, 15oC, Outlet steam: 700K o Tpinch = 20oC, Tapproach = 15oC o Water mass flow → Saturated steam @ evaporator outlet & SAR=6%
• Heliostat field oSAR=12% @ 800W/m2 Summer solstice
• Operating scenario o Maximum power → TIT constant o Yearly continuous baseload operation
• Performance simulation o Hourly simulation → Integration → Annual performance
Design Specifications & Operating Scenario
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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Performance Simulation
0
5
10
15
20
25
30
35
ΔE ΔFuel Δeff_f Δwater
Diffe
renc
e [%
]Annual Performance Difference Between Solar &
Convetional STIG Engines
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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• Higher energy production, fuel and water consumption • Similar results if troughs were used (Direct Steam Generation) • Troughs with oil could be used: o Inferior performance (addition of oil-water heat exchanger) o Already used technology in commercial state
02468
1012141618
0 5 10 15 20
Diffe
renc
e be
twee
n so
lar &
co
nvet
iona
l STI
G e
ngin
es [%
]
Time of the day [hours]
Δeff_f
ΔWf
ΔP
Performance Simulation
Performance difference between solar and conventional STIG engines for a winter
day
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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• Steam injection & chocked turbine with constant TIT → higher PR
• High SAR may result to surge
• In this study: oSAR=6%
→ SM ↓ ~25% from fuel-only operation
oSAR=12% → SM ↓ ~50% from fuel-only operation
Change Of Operating Point
Operating Points On Compressors Map
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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MODELLING
STEAM PRODUCTION METHOD
o Design Specifications & Operating Scenario
o Performance Simulation
SOLAR STEAM IN A STIG ENGINE
o Design Specifications & Operating Scenario
o Performance Simulation
o Change Of Operating Point
SUMMARY & CONCLUSIONS
Contents
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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Solar STIG studied as an alternative to conventional solar hybridization
o Based on proven technologies (STIG & solar steam)
o Fewer GT modifications
o Augmented energy production
Steam generation method: Tower scheme performs better than troughs
Assessment of performance and operability on addition of solar steam into an already STIG engine
o Produced energy, fuel and water consumption increase
o Surge margin decreases
o Similar results if troughs were used
Summary – Conclusions
ASSESMENT OF SOLAR STEAM INJECTION IN GAS TURBINES ASME Turbo EXPO 2016, June 13-17, Seoul, South Korea
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THANK YOU
Laboratory of Thermal Turbomachines
National Technical University of Athens
