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Techno-economic optimization of molten salt solar tower plants

  • In this paper the results of a techno-economic analysis of improved and optimized molten salt solar tower plants (MSSTP plants) are presented. The potential improvements that were analyzed include different receiver designs, different designs of the HTF-system and plant control, increased molten salt temperatures (up to 640°C) and multi-tower systems. Detailed technological and economic models of the solar field, solar receiver and high temperature fluid system (HTF-system) were developed and used to find potential improvements compared to a reference plant based on Solar Two technology and up-to-date cost estimations. The annual yield model calculates the annual outputs and the LCOE of all variants. An improved external tubular receiver and improved HTF-system achieves a significant decrease of LCOE compared to the reference. This is caused by lower receiver cost as well as improvements of the HTF-system and plant operation strategy, significantly reducing the plant own consumption. A novel star receiver shows potential for further cost decrease. The cavity receiver concepts result in higher LCOE due to their high investment cost, despite achieving higher efficiencies. Increased molten salt temperatures seem possible with an adapted, closed loop HTF-system and achieve comparable results to the original improved system (with 565°C) under the given boundary conditions. In this analysis all multi tower systems show lower economic viability compared to single tower systems, caused by high additional cost for piping connections and higher cost of the receivers. REFERENCES

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Author:Michael Puppe, Stefano Giuliano, Cathy Frantz, Ralf Uhlig, Ralph Schumacher, Wagdi Ibraheem, Stefan Schmalz, Barbara Waldmann, Christoph Guder, Dennis Peter, Christian SchwagerORCiD, Cristiano José Teixeira BouraORCiD, Spiros AlexopoulosORCiD, Michael Spiegel, Jürgen Wortmann, Matthias Hinrichs, Manfred Engelhard, Michael Aust
DOI:https://doi.org/10.1063/1.5067069
Parent Title (English):AIP Conference Proceedings art.no. 040033
Publisher:AIP Publishing
Place of publication:Melville, NY
Document Type:Article
Language:English
Year of Completion:2018
Date of first Publication:2019/04/17
Date of the Publication (Server):2019/04/17
Volume:2033
Issue:Issue 1
Link: https://doi.org/10.1063/1.5067069
Zugriffsart:weltweit
Institutes:FH Aachen / Solar-Institut Jülich
collections:Verlag / AIP Publishing