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On the Feasibility of Thermochemical Energy Storage for CSP plants: Technology Evaluation and Conceptual Design
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
På genomförbarheten av termokemisk energilagring för CSP-anläggningar : Teknisk utvärdering och konceptuell design (Swedish)
Abstract [en]

This master thesis focuses on the review of the thermochemical energy storage (TCES) concept and its application in Concentrated Solar Power (CSP) plants. The TCES concept has been reviewed and critically analyzed, highlighting the advantages and digging into the challenges that this technology must overcome to reach commercial scale. As an emerging concept, research interest is just starting to grow. Studies are scarce and there are only a handful of experimental campaigns. This work has therefore focused on the conceptual design, material properties matching and preliminary economic analysis. Thermodynamic performance as well as kinetics of a model system have been described. The model system consists of a solid bed of Calcium Hydroxide (Ca(OH)2) activated by heat transfer from molten salts (MS). A heat transfer model was built using COMSOL Multiphysics. The results indicate that due to low thermal conductivity of the studied materials, poor performance results and long charging times are required for material activation. The cost of the system can vary between 7 and 32 times the cost for current MS storage, highlighting that important improvements are required for the development of this technology.

Abstract [sv]

Denna uppsats fokuserar på översynen av termokemisk energilagring (TCES) -konceptet och dess tillämpning i CSP-anläggningar (Concentrated Solar Power). TCES-konceptet har granskats och analyserats kritiskt, belyser fördelarna och gräver i de utmaningar som denna teknik måste övervinna för att nå kommersiell skala. Som ett växande koncept börjar forskningsintresse bara växa. Studier är knappa och det finns bara en handfull experimentella kampanjer. Detta arbete har därför fokuserat på konceptuell design, materialegenskaper matchning och preliminär ekonomisk analys. Termodynamisk prestanda samt kinetik hos ett modellsystem har beskrivits. Modelsystemet består av en fast bädd av kalciumhydroxid (Ca(OH)2) aktiveradgenom värmeöverföring från smälta salter (MS). En värmeöverföringsmodell byggdes med hjälp av COMSOL Multiphysics. Resultaten visar att på grund av låga värmeledningsförmåga hos de studerade materialen krävs dåliga resultat och långa laddningstider för materialaktivering. Kostnaden för systemet kan variera mellan 7 och 32 gånger kostnaden för nuvarande MS-lagring, vilket tyder på att viktiga förbättringar krävs för utvecklingen av denna teknik.

Place, publisher, year, edition, pages
2018. , p. 93
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-226298OAI: oai:DiVA.org:kth-226298DiVA, id: diva2:1197946
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Available from: 2018-04-16 Created: 2018-04-16 Last updated: 2018-04-16Bibliographically approved

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CiteExportLink to record
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