session 5: csp overview - 1 agenda discussion of homework overview heat engines storage trough...
TRANSCRIPT
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Session 5: CSP Overview - 1Agenda
• Discussion of Homework• Overview• Heat Engines • Storage• Trough Systems• Homework Assignment
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Learning Objectives
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Students should be able to
• Compare CSP vs. PV in meeting customer needs • Describe the three basic CSP approaches and their status• Explain how steam, gas turbine and Stirling engines work• Draw a schematic of a power tower system with thermal storage• Modify the above schematic to incorporate a hybrid gas turbine• Calculate the cost-of-electricity for a CSP system• Compare typical CSP and PV plant supply chains• Give examples of current CSP Projects and describe them• Predict how CSP technologies will develop in the future• Conceptually define a CSP system based on given requirements
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Example CSP Plants
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So What’s New?
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Dish/Steam Irrigation System circa 1900 at Broadway and the railroad tracks in Tempe, Arizona
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Desirable Grid Power• High Quality
• Harmonics• Power Factor
• Available
• Dispatchable
• Continuous
• Low Cost
• Renewable (Gov. Reqt.)
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Solar Plant Design Considerations
Solar PlantDesign
Fossil Fuel (?)
Solar Input (Variability)
Ambient Conditions
Water
Electrical Power
Design Requirements Risk
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Basic CSP Concept
Receiver/Heat Engine
Low-level Solar Energy
CONCENTRATOR
Generator
HighTemperatureEnergy
Low TemperatureHeat Sink
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Heat Engine Efficiency• Engines operate on the 2T Principle
• Carnot efficiency
• Engines are limited by the Carnot efficiency
• Goal is to maximize efficiency to reduce collector field size
• At some point, the cost of higher efficiency increases overall cost
Engine W,UsefulWork
Qout at Tcold
Qin at Thot
η = Thot – Tcold = 1 – Tcold Thot Thot
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Power Cycle Efficiencies
Source: Summary Report for Concentrating Solar Power Thermal Storage Workshop, NREL/TP-5500-52134 August 2011
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United States Solar Market
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Source: SES Presentation toAZ/NV SAE, 2005
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International Solar Market
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Source: SES Presentation toAZ/NV SAE, 2005
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Basic CSP Concept
Receiver/Heat Engine
Low-level Solar Energy
CONCENTRATOR
Generator
HighTemperatureEnergy
Low TemperatureHeat Sink
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CSP System Elements
Concentrator Receiver Heat Engine Generator
BalanceOf
Plant
GRID13
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CSP System Elements
Concentrator Receiver Heat Engine Generator
BalanceOf
PlantGRID
• Trough• Heliostats
(Power Tower)• Dish
• Linear• Cavity
• Tubular• Volumetric
• Rankine• Steam• Organic
• Gas Turbine• Stirling• Combined• Hybrid (fossil fuel)
• Synchronous• Induction
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Types of Concentrating Solar Power Systems
Source: Powerpoint Presentation, Muller-Steinhagen et al., Concentrating Solar Power: A Vision for Sustainable Electricity Generation, Institute for Technical Thermodynamics, German Aerospace Center, Stuttgart (DLR)
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Types of Concentrating Solar Power Systems
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Types of CSP Systems
• Single-axis tracking• Parabolic troughs• Moderate temperature• Central engine• Moderate efficiency
• Dual-axis tracking• Heliostats• Flat facets• High temperature• Central engine• Higher efficiency
• Dual-axis tracking• Parabolic facets• High temperature• Distributed engines• Highest efficiency
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Types of Receivers
• Parabolic trough• Moderate temperature
• Power Tower• Dish• Gas and liquid fluid• High temperature• Convection losses
• Power Tower• Dish• Quartz window• Gas working fluid• High temperature• Low convection
losses
Linear Receiver Cavity ReceiverVolumetricTubular
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Cavity Receiver
Source: SES Presentation toAZ/NV SAE, 2005
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Volumetric Receiver
Source: Powerpoint Presentation, Muller-Steinhagen et al., Concentrating Solar Power: A Vision for Sustainable Electricity Generation, Institute for Technical Thermodynamics, German Aerospace Center, Stuttgart (DLR)
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Heat Engines
Steam (Rankine) Cycle(30-35% efficient)
Gas Turbine Cycle(30-40% efficient)
Stirling Cycle(40-45% efficient)
Trough PowerTower
DishPowerTower
Dish
WetCooling
DryCooling
NoCooling
DryCooling
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Steam (Rankine) Cycle
Heater
Turbine
Condenser
Cooler
Ambient Air
P
Pump GenGen
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Gas Turbine (Brayton) Cycle
Combustor
Turbine
Ambient Air
Compressor GenGen
Ambient Air
Qin from fuel
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Semi-Closed Brayton Cycle
Heater
Turbine
Ambient Air
Compressor GenGen
Ambient Air
Qin
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Recuperated Semi-Closed Brayton
Ambient Air
Recuperator
Turbine
Ambient Air
Compressor GenGen
Qin
Heater
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Stirling Engine is Closer to Carnot
• In Rankine system, Thot varies, butTcold is relatively constant
• In Brayton system, Thot varies and Tcold
varies
• In Stirling system, Thot and Tcold approach constant values
For expansion and compression processes:
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Source: SES Presentationto AZ/NV SAE, 2005
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CSP System Elements
Concentrator Receiver Heat Engine Generator
BalanceOf
Plant
GRID28
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CSP System Elements
Concentrator Receiver Heat Engine Generator
BalanceOf
Plant
GRID
Losses Losses Losses
Losses
Losses
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CSP System Elements
Concentrator Receiver Heat Engine Generator
BalanceOf
Plant
GRID
Losses Losses Losses
Losses
Losses
ηsys = ηconc ηrec ηeng ηgen ηBOP Sunlight-to-Busbar Efficiency
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CSP Advantage: Storage
Concentrator Receiver Heat Engine Generator
BalanceOf
Plant
GRID
Storage
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Storage Advantages
• Extends operation during peak demand hours• Maintains output during transient clouds• Provides power on-demand (dispatchable)
Source: NREL website
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Trough Plant Components
C
A
B
Source: NREL
Source: NREL
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Power Tower Plant Components
A
B
C
Source: NREL
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Dish/Engine Plant Components
A
B
C
Source: SES Presentationto AZ/NV SAE, 2005
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Levelized Cost of Electricity Comparison
Source: PowerPoint presentation, Brett Prior, November 2011, GTM Research, www.greentechmedia.com/article/read/can-solar-thermal-be-cheaper-than-pv/
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Trough CSP
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SEGS Units
• Solar Electric Generating Systems
• Mohave Desert, Built 1984-1990
• Trough/Steam/Evap. Cooling
• Up to 25% Output from Natural Gas
• 9 Plants: 14, 30, 80 MWe• 354 MWe Total Output
Aerial view of five (SEGS III – VII), 30-MW SEGS solar plants
Source: NREL
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SEGS VI: 30 MWe• Kramer Junction• Start-up: 1988• Field Supply Temp: 390
degrees Celsius
• Field Size: 188,000 m2
• Luz International• KJC Operating Company
Figure 1.1. Parabolic troughs at a 30 MWe (net) SEGS plant in Kramer Junction, CAJanuary 2006 • Angela M. Patnode • “Simulation and Performance Evaluation of Parabolic Trough Solar Power Plants”
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Solar Field Design• Single-axis tracking collector troughs• Float-formed, parabolic-curved mirrors• Heat collection element
(HCE) runs through focal line
• Thermal energy into heat transfer fluid (HTF)
• Trough axes north-south• Track east to west
SOURCE: January 2006 • Angela M. Patnode • “Simulation and Performance Evaluation of Parabolic Trough Solar Power Plants”
Solar Collector Assembly (SCA)
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Figure 2.1. Layout of the SEGS VI solar trough field. The superimposed arrows indicate the direction of heat transfer fluid flow. (Photo source: KJC Operating Company, 2005)
January 2006 • Angela M. Patnode • “Simulation and Performance Evaluation of Parabolic Trough Solar Power Plants”
SEGS VI Layout
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January 2006 • Angela M. Patnode • “Simulation and Performance Evaluation of
Parabolic Trough Solar Power Plants”
Parabolic Trough Collector End of Row
Flexible Joints
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Figure 2.3. Schematic of a Solar Collector Assembly (SCA) (Source: Stuetzle, 2002)January 2006 • Angela M. Patnode • “Simulation and Performance Evaluation of
Parabolic Trough Solar Power Plants”
Overall Trough Collector Design
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Heat Collection Element (HCE)
• Steel absorber tube 70 mm in diameter• Coated with either black chrome or cermet• Vacuum between absorber and glass envelope
to limit heat loss
Photo source:Solel UVAC, 2004
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Heat Transfer Fluid (HTF) • Synthetic oil -- mixture of biphenyl and diphenyl
oxide (Therminol VP-1) • Receives solar energy and transfers it to steam
cycle in a three-stage boiler (reheater not shown)
Solar Field
Superheater
Steam Generator
Pre-heaterPump
Steam Cycle/Generator
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Simplified Overall Schematic
Source:G. Cohen, Solargenix Energypresentation to IEEE RenewableEnergy, Las Vegas, May 16, 2006
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Transfer of HTF Energy to Steam Plant
Source: January 2006 • Angela M. Patnode • “Simulation and Performance Evaluation of Parabolic Trough Solar Power Plants”
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Figure 2.1. Layout of the SEGS VI solar trough field. The superimposed arrows indicate the direction of heat transfer fluid flow. (Photo source: KJC Operating
Company, 2005)Source: January 2006 • Angela M. Patnode • “Simulation and Performance Evaluation of Parabolic Trough Solar Power Plants”
SEGS VI Layout
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SEGS VI: Solar Field Layout
Adapted from “Simulation and Performance Evaluation of Parabolic Trough Solar Power Plants” Jan 2006,
Angela M. Patnode
Steam Heat
Exchangers
Row of 8 SCAs
Row of 8 SCAs
Row of 8 SCAs
Row of 8 SCAs
East Field(25 Parallel Loops)
Row of 8 SCAs
Row of 8 SCAs
Row of 8 SCAs
Row of 8 SCAs
West Field(25 Parallel Loops)
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SEGS VI Performance
Source: January 2006 • Angela M. Patnode • “Simulation and Performance Evaluation of Parabolic Trough Solar Power Plants”
June 21, 2004 December 21, 2004
Why is Solar Input so low in winter?
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Trough Plants are Single Axis Tracking
Source: January 2006 • Angela M. Patnode • “Simulation and Performance Evaluation of Parabolic Trough Solar Power Plants”
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SEGS VI Performance for 1998
Source: An Overview of the Kramer Junction SEGS Recent Performance Scott Frier, KJC OPERATING COMPANY 1999 Parabolic Trough Workshop August 16, 1999 Ontario, California
• Average Daily Normal Insolation = 7.913 kWh/m2/day
• Percentage measured = 106.3 %
• Solar DNI Input = 577,200 MWht
• Gross Electrical Output from Solar Production = 67,358 MWhe
• Station Use = 11.7% of Gross Energy
• Net Electrical Output from Solar Production = 59,477 MWhe
• Overall Efficiency = Net Electrical Out/Solar DNI In = 10.3%
• Solar Capacity Factor = 22.6%
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Saguaro (near Marana) Also uses parabolic trough collectors to heat up a
“thermal oil heat transfer” fluid, up to 288 °C Instead of steam, the Rankine cycle uses an organic
liquid (pentane) that can boil at a lower temperature 1 MW capacity No storage capability Went online in 2006 Open for tours on the last Wednesday of the month
(http://www.aps.com/_files/renewable/SP017SaguaroSolarTrough.pdf)
Source: Arizona Public Service
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Saguaro Diagram
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Saguaro “Power Block”
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Homework for Session 6
• Review slides for Sessions 6 and 7• Select a current CSP Plant and describe it
• Two-pages• Professional quality• Be prepared to discuss in class