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Scaling effects of a novel solar receiver for a micro gas-turbine based solar dish system
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. (Concentrating Solar Power)ORCID iD: 0000-0003-3789-8654
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.ORCID iD: 0000-0003-1792-0551
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
2018 (English)In: International Journal of Solar Energy, ISSN 0142-5919, E-ISSN 1477-2752, Vol. 162, p. 248-264Article in journal (Refereed) Published
Abstract [en]

Laboratory-scale component testing in dedicated high-flux solar simulators is a crucial step in the developmentand scale-up of concentrating solar power plants. Due to different radiative boundary conditions available inhigh-flux solar simulators and full-scale power plants the temperature and stress profiles inside the investigatedreceivers differ between these two testing platforms. The main objective of this work is to present a systematicscaling methodology for solar receivers to guarantee that experiments performed in the controlled environmentof high-flux solar simulators yield representative results when compared to full-scale tests. In this work theeffects of scaling a solar air receiver from the integration into the OMSoP full-scale micro gas-turbine based solardish system to the KTH high-flux solar simulator are investigated. Therefore, Monte Carlo ray-tracing routines ofthe solar dish concentrator and the solar simulator are developed and validated against experimental characterizationresults. The thermo-mechanical analysis of the solar receiver is based around a coupled CFD/FEManalysislinked with stochastic heat source calculations in combination with ray-tracing routines. A geneticmulti-objective optimization is performed to identify suitable receiver configurations for testing in the solarsimulator which yield representative results compared to full-scale tests. The scaling quality is evaluated using aset of performance and scaling indicators. Based on the results a suitable receiver configuration is selected forfurther investigation and experimental evaluation in the KTH high-flux solar simulator.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 162, p. 248-264
Keywords [en]
Pressurized volumetric solar air receiver; Experimental evaluation; High-flux solar simulator
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
URN: urn:nbn:se:kth:diva-223611DOI: 10.1016/j.solener.2018.01.020ISI: 000427218600025Scopus ID: 2-s2.0-85041424666OAI: oai:DiVA.org:kth-223611DiVA, id: diva2:1185480
Note

QC 20180226

Available from: 2018-02-25 Created: 2018-02-25 Last updated: 2018-04-17Bibliographically approved
In thesis
1. Solar receiver development for gas-turbine based solar dish systems
Open this publication in new window or tab >>Solar receiver development for gas-turbine based solar dish systems
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Small-scale concentrating solar power plants such as micro gas-turbine based solar dish systems have the potential to harness solar energy in an effective way and supply electricity to customers in remote areas. In such systems, the solar receiver transfers the power of concentrated solar radiation to the working fluid of the power conversion cycle. It is one of the key components as it needs to operate at high temperatures to ensure a high power cycle efficiency and under high flux densities to ensure a high receiver efficiency. In order to address these challenges and to ensure efficient and reliable operation innovative designs are needed.

This research work focuses on the complete development of a novel solar receiver applying a new systematic design and analysis methodology. Therefore, a comprehensive receiver design and experimental evaluation process were developed and implemented. The design process includes the identification of technical specifications and requirements, the development of receiver design tools of different investigation levels coupled with multi-objective optimization tools, the evaluation of scaling effects between tests in the KTH high-flux solar simulator and the full-scale solar dish system. As a result of the design process a representative final receiver was established with material temperatures and stresses below critical limits while respecting the design specification.

The experimental evaluation includes the enhancement of the KTH high-flux solar simulator to provide stable and reliable operating conditions, the precise characterization of the radiative boundary conditions, the design of a receiver test bed recreating the operating behavior of a gas-turbine, and the final receiver testing for multiple operating points. It was shown that the prototype reaches an efficiency of 69.3% for an air outlet temperature of 800°C and a mass flow of 29.5 g/s. For a larger mass flow of 38.4 g/s a receiver efficiency of 84.8% was achieved with an air outlet temperature of 749°C.

The measurement results obtained were then used for a multi-point validation of the receiver design tools, resulting in a high level of confidence in the accuracy of the tools. The validated models were then harnessed to calculate the performance of a full-scale solar receiver integrated into the OMSoP solar dish system. It was shown that a solar receiver can be designed, which delivers air at 800°C with a receiver efficiency of 82.2%.

Finally, the economic potential of micro gas-turbine based solar systems was investigated and it was shown that they are ideally suited for small-scale stand-alone and off-grid applications.

The results of the receiver development highlight the feasibility of using volumetric solar receivers to provide heat input to micro gas-turbine based solar dish systems and no major hurdles were found.

Abstract [sv]

Småskalig koncentrerad solkraft som mikrogasturbinbaserade solkraftverk med paraboliska solfångare visar potential att utnyttja solens energi på ett effektivt sätt och levererar el till kunder i avlägsna områden. I dessa solkraftverk är det solmottagaren som överför energin av koncentrerat solljus till kraftomvandlingssystemets arbetsmedium. Mottagaren är en av de viktigaste komponenterna eftersom den drivs vid höga temperaturer för att nå en hög systemverkningsgrad och är utsatt för höga ljusintensiteter för att nå en hög komponentverkningsgrad. För att hantera dessa utmaningar och garantera en effektiv och pålitlig drift behövs nya och innovativa lösningar.

Syftet med detta arbete är att utveckla en solmottagare genom att använda en systematisk design- och analysmetodik. Därför utvecklades en omfattande design- och analysprocess som inkluderar identifiering av tekniska specifikationer, utveckling av designverktyg för olika detaljnivåer i samband med optimeringsmetoder, utvärdering av skalningseffekter mellan laboratorietester och fullskaliga tester. Som resultatet av designprocessen konstruerades en solmottagare för den experimentella utvärderingen där alla materialtemperaturer och materialspänningar är inom tillåtna nivåer.

Den experimentella utvärderingen inkluderar förbättringarna av KTH:s solsimulator för att säkerställa stabil och pålitlig drift, karakterisering av instrålningen, utveckling av en solmottagartestbädd, och solmottagarexperiment för olika driftspunkter. Resultaten visar att solmottagaren uppnår en verkningsgrad på 69.3% för en luftutloppstemperatur på 800°C och ett massflöde på 29.5 g/s. Verkningsgraden ökar till 84.8% för ett massflöde på 40 g/s med en luftutloppstemperatur på 749°C.

De experimentella resultaten användes för att validera de utvecklade solmottagardesignverktygen genom en flerpunktsvalideringsprocess vilket resulterar i ett högt förtroende av designverktygens noggrannhet. De validerade designverktygen användes för att beräkna prestandan av en fullskalig solmottagare för integreringen i OMSoP solkraftverket. Resultaten visar att konceptet uppnår en luftutloppstemperatur på 800°C med en verkningsgrad på 82.5%.

Till sist undersöktes den ekonomiska potentialen av mikrogasturbinbaserade solkraftverk. De teknoekonomiska analyserna visar att kraftverken är ideal för småskaliga off-grid applikationer.

Resultaten av solmottagarutvecklingen framhäver möjligheten att använda volumetriska solmottagare för att leverera värme till mikrogasturbinbaserade solkraftverk med paraboliska solfångare och inga stora problem upptäcktes.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2018. p. 131
Series
TRITA-ITM-AVL ; 2018:4
Keywords
Concentrating solar power, volumetric solar receiver, development, experimental evaluation, validation, Koncentrerad solkraft, volumetrisk solmottagare, utveckling, experimentell utvärdering, validering
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
urn:nbn:se:kth:diva-226343 (URN)978-91-7729-746-8 (ISBN)
Public defence
2018-05-15, Kollegiesalen, Brinellvägen 8, Stockholm, 13:00 (English)
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Supervisors
Note

QC 20180418

Available from: 2018-04-18 Created: 2018-04-17 Last updated: 2018-04-18Bibliographically approved

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