Comparative system analysis of direct steam generation and synthetic oil parabolic trough power plants with integrated thermal storage |
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| Authors: | Jan Fabian Feldhoff Kai Schmitz Markus Eck Lars Schnatbaum-Laumann Doerte Laing Francisco Ortiz-Vives Jan Schulte-Fischedick |
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| Affiliation: | 1. German Aerospace Center, DLR, Institute for Solar Research, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany;2. Flagsol GmbH, 50678 Cologne, Germany;3. DLR, Institute for Solar Research, Stuttgart, Germany;4. Solar Millennium AG, 91052 Cologne, Germany;5. DLR, Institute of Technical Thermodynamics, Stuttgart, Germany;6. Senior Berghöfer GmbH, 34121 Kassel, Germany;7. Schott Solar CSP GmbH, 95666 Mitterteich, Germany;1. Novatec Solar GmbH, Herrenstrasse 30, 76133, Karlsruhe, Germany;2. Institute for neutron physic and reactor technology (INR), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany;3. Fraunhofer Institute for solar energy systems (ISE), Heidenhofstrasse 2, 79110 Freiburg, Germany;4. Institute for technical thermodynamics (DLR-TT), German Aerospace center (DLR), Pfaffenwaldring 38-40, 70569, Stuttgart, Germany;1. Energy Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;2. CIEMAT – Plataforma Solar de Almería, Apartado 20, Tabernas E-04200, Almería, Spain;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China |
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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 (Eck et al., 2008b, Price et al., 2002, Zarza, 2002). 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% (Feldhoff et al., 2010). 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 (Solar Millennium, 2009) 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 9 h 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. |
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