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Research Papers

Field Test of Water-Steam Separators for Direct Steam Generation in Parabolic Troughs

[+] Author and Article Information
Markus Eck

German Aerospace Center (DLR), Institute of Technical Thermodynamics, Pfaffenwaldring 38-40, 70569 Stuttgart, Germanymarkus.eck@dlr.de

Holger Schmidt

 Framatome ANP, Freyerslebenstrasse 1, 91058 Erlangen, Germany

Martin Eickhoff

German Aerospace Center (DLR), Institute of Technical Thermodynamics, Plataforma Solar de Almería, 04200 Tabernas/Almería, Spain

Tobias Hirsch

German Aerospace Center (DLR), Institute of Technical Thermodynamics, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany

The pressure loss converges to different values for the different separators since due to their different geometries they have different pressure losses for a pure steam flow.

J. Sol. Energy Eng 130(1), 011002 (Dec 28, 2007) (6 pages) doi:10.1115/1.2804619 History: Received September 25, 2006; Revised April 11, 2007; Published December 28, 2007

Direct steam generation (DSG) represents a promising option to improve today’s parabolic trough technology for solar thermal power generation. The European DISS and INDITEP projects have proven the feasibility of the DSG process under real solar conditions at the DISS test facility at the Plataforma Solar de Almería (PSA) (Zarza, E., Valenzuela, L., Léon, J., Hennecke, K., Eck, M., Weyers, H.-D., Eickhoff, M., 2004, “Direct Steam Generation in Parabolic Troughs Final Results and Conslusions of the DISS Project  ,” Energy, 29, pp. 635–644). These projects have also shown that the recirculation mode is the preferred operation mode for DSG collector fields. This concept requires water-steam separators at the end of the evaporation section of the collector loop. Both compact water-steam separators for every single row or huge separation drums for the whole collector field are considered. Small compact water-steam separators show a lower inertia, reducing the time for start-up. Within INDITEP and the German R&D project SOLDI compact water-steam separators have been developed, manufactured, and tested by DLR and Siemens, with its subcontractor Framatome ANP. Prototypes of a cyclone and a baffle separator have been implemented into the DISS test facility. More than 200 tests have been performed to investigate the separation efficiency, the pressure loss, and the performance under transient conditions. This paper focuses on the steady-state tests.

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Figures

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Figure 8

Measured separation efficiency of the baffle and the cyclone separator (to improve clarity the error bars are neglected in this plot)

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Figure 9

Measured evaporation length within the superheating section for the baffle and the cyclone separator

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Figure 7

Measured separation efficiency of the baffle separator for different operation pressures with error bars

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Figure 6

Measured pressure loss coefficient for the investigated separators as a function of the inlet steam quality

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Figure 5

Maximum measurements accuracy for several measured separation efficiencies as a function of the inlet steam quality

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Figure 4

Measured temperatures along the superheating section for two different steady-state tests (Collectors 9–11 from l=600–700m)

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Figure 3

Schematic setup of the DISS test facility with the used measuring points

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Figure 2

Schematic diagram of a baffle separator

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Figure 1

Schematic diagram of a cyclone separator (not to scale)

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