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Comparative System Analysis of Direct Steam Generation and Synthetic Oil Parabolic Trough Power Plants with Integrated Thermal Storage

Feldhoff, Jan Fabian and Schmitz, Kai and Eck, Markus and Schnatbaum-Laumann, Lars and Laing, Doerte and Ortiz-Vives, Francisco and Schulte-Fischedick, Jan (2011) Comparative System Analysis of Direct Steam Generation and Synthetic Oil Parabolic Trough Power Plants with Integrated Thermal Storage. 5th International Conference on Energy Sustainability, 07.-10. Aug. 2011, Washington, D.C., USA.

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Abstract

Parabolic trough power plants are currently the most commercially applied systems for CSP power generation. To improve their cost-effectiveness, one focus of industry and research is the development of processes with other heat transfer fluids than the currently used synthetic oil. One option is the utilization of water/steam in the solar field, the so-called direct steam generation (DSG). Several previous studies promoted the economic potential of DSG technology. Analyses’ results showed that live steam parameters of up to 500°C and 120 bars are most promising and could lead to a reduction of the levelized electricity cost (LEC) of about 11%. However, all of these studies only considered plants without thermal energy storage (TES). Therefore, a system analysis including integrated TES was performed by Flagsol GmbH and DLR together with Solar Millennium AG, Schott CSP GmbH and Senior Berghöfer GmbH, all Germany. Two types of plants are analyzed and compared in detail: a power plant with synthetic oil and a DSG power plant. The design of the synthetic oil plant is very similar to the Spanish Andasol plants and includes a molten salt two-tank storage system. The DSG plant has main steam parameters of 500 °C and 112 bars and uses phase change material (PCM) for the latent and molten salt for the sensible part of the TES system. To enable comparability, both plants share the same gross electric turbine capacity of 100 MWel, the same TES capacity of nine hours of full load equivalent and the same solar multiple of the collector field of about two. This paper describes and compares both plants’ design, performance and investment. Based on these results, the LEC are calculated and the DSG plant’s potential is evaluated. One key finding is that with currently proposed DSG storage costs, the LEC of a DSG plant could be higher than those of a synthetic oil plant. When considering a plant without TES on the other hand, the DSG system could reduce the LEC. This underlines the large influence of TES and the still needed effort in the development of a commercial storage system for DSG.

Document Type:Conference or Workshop Item (Paper)
Title:Comparative System Analysis of Direct Steam Generation and Synthetic Oil Parabolic Trough Power Plants with Integrated Thermal Storage
Authors:
AuthorsInstitution or Email of Authors
Feldhoff, Jan Fabianjan.feldhoff@dlr.de
Schmitz, KaiFlagsol
Eck, Markusmarkus.eck@dlr.de
Schnatbaum-Laumann, LarsSolar Millennium
Laing, Doertedoerte.laing@dlr.de
Ortiz-Vives, FranciscoSenior Berghöfer
Schulte-Fischedick, JanSchott Solar CSP
Date:2011
Status:Published
Keywords:direct steam generation, synthetic oil, parabolic trough, electricity cost, system comparison, solar thermal power plant, thermal energy storage, PCM storage
Event Title:5th International Conference on Energy Sustainability
Event Location:Washington, D.C., USA
Event Type:international Conference
Event Dates:07.-10. Aug. 2011
Organizer:ASME
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Applikationsentwicklung (old)
Location: Stuttgart
Institutes and Institutions:Institute of Solar Research
Deposited By: Jan Fabian Feldhoff
Deposited On:15 Dec 2011 14:38
Last Modified:15 Dec 2011 14:38

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