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Thermal storage concept for solar thermal power plants with direct steam generation

Seitz, Markus and Hübner, Stefan and Johnson, Maike (2015) Thermal storage concept for solar thermal power plants with direct steam generation. SolarPACES 2015, 13.-16. Okt. 2015, Cape Town, South Africa.

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Abstract

Direct steam generation enables the implementation of a higher steam temperature for parabolic trough concentrated solar power plants. This leads to much better cycle efficiencies and lower electricity generating costs. For a flexible and more economic operation of such a power plant, it is necessary to develop thermal energy storage systems for the extension of the production time of the power plant. In the case of steam as the heat transfer fluid, it is important to use a storage material that uses latent heat for the storage process. This leads to a minimum of exergy losses during the storage process. In the case of a concentrating solar power plant, superheated steam is needed during the discharging process. This steam cannot be superheated by the latent heat storage system. Therefore, a sensible molten salt storage system is used for this task. In contrast to the state-of-the-art thermal energy storages within the concentrating solar power area of application, a storage system for a direct steam generation plant consists of a latent and a sensible storage part. Thus far, no partial load behaviors of sensible and latent heat storage systems have been analyzed in detail. In this work, an optimized fin structure was developed in order to minimize the costs of the latent heat storage. A complete system simulation of the power plant process, including the solar field, power block and sensible and latent heat energy storage calculates the interaction between the solar field, the power block and the thermal energy storage system.

Item URL in elib:https://elib.dlr.de/99104/
Document Type:Conference or Workshop Item (Poster)
Title:Thermal storage concept for solar thermal power plants with direct steam generation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Seitz, Markusmarkus.seitz (at) dlr.deUNSPECIFIED
Hübner, StefanLinde AGUNSPECIFIED
Johnson, Maikemaike.johnson (at) dlr.deUNSPECIFIED
Date:October 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Thermal energy storage, Phase change material, Molten salt, Concentrated solar power, Direct steam generation, System analysis
Event Title:SolarPACES 2015
Event Location:Cape Town, South Africa
Event Type:international Conference
Event Dates:13.-16. Okt. 2015
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Energy-efficient Processes (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Thermochemical Processes (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Seitz, Markus
Deposited On:16 Nov 2015 11:50
Last Modified:16 Nov 2015 11:51

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