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Integration of thermochemical heat storage with a municipal district heating system: In future scenario with large variations in electricity price
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis investigates the feasibility and benefits of integrating Thermochemical heat Storage (THS) into a CHP (Combined Heat and Power) plant. A case study is done for the CHP-plant in Sala, Sweden, with a maximum heat output of 20.9 MW and maximum electricity output of 9.6 MW. The THS type considered is calcium oxide in a hydroxide system. The fluctuations in electricity price for years 2020, 2030 and 2040 are considered and low-price electricity is used as a charging source for THS. During charging the superheated steam (endothermic reaction) is used to cover some of the district heating demand. The high temperature discharge from the THS is used as reheat in the Rankine cycle. The operations are modeled in Ebsilon and optimization is done in MATLAB using genetic algorithm with the objective to achieve maximum annual revenue. The results suggest that it is not feasible to introduce THS with electricity as a charging source in year 2020, but in 2030 and 2040 THS shows promising potential. The biggest increase in revenue comes from reduced fuel consumption, and, to a lesser extent, increased income from electricity. It is concluded that Calcium hydroxide is a promising candidate for integration into CHP during large electricity price fluctuation. The main drivers for the feasibility of this combination are high fuel price and large fluctuations of electricity price.

Place, publisher, year, edition, pages
2018. , p. 63
Keywords [en]
CHP, Operation strategies, Energy Storage, Thermochemical Heat Storage, THS, Techno Economic, Optimization, District Heating, Merit order effect
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:mdh:diva-39775OAI: oai:DiVA.org:mdh-39775DiVA, id: diva2:1217218
External cooperation
Rise research institute of Sweden
Subject / course
Energy Engineering
Presentation
2018-05-31, R1-302, HÖGSKOLEPLAN 1, 721 23, Västerås, 11:00 (English)
Supervisors
Examiners
Available from: 2018-06-14 Created: 2018-06-12 Last updated: 2018-06-14Bibliographically approved

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CiteExportLink to record
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