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Numerical investigation of severe slugging under conditions of a parabolic trough power plant with direct steam generation

Hoffmann, Alexander and Hirsch, Tobias and Pitz-Paal, Robert (2016) Numerical investigation of severe slugging under conditions of a parabolic trough power plant with direct steam generation. Solar Energy, pp. 567-585. Elsevier. doi: 10.1016/j.solener.2016.04.012. ISSN 0038-092X.

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Official URL: http://www.sciencedirect.com/science/article/pii/S0038092X16300354


The present study reveals a numerical investigation of severe slugging with the system code ATHLET. It is aimed to close knowledge gaps about the two-phase flow within the connection pipes of two adjacent collectors in a solar thermal power plant with direct steam generation. The underlying ATHLET model provides a one-dimensional 6 equation model with a mass, momentum and energy equation for each phase, respectively. This comprehensive model provides all features for the examination of water steam flows in this type of power plants. A validation of ATHLET for severe slugging conditions is performed and the obtained periods of severe slugging as well as the pressure amplitudes are in good agreement with experimental data. The probability of severe slugging is studied for numerous flow conditions and geometric conditions which are close to the operation conditions and the piping system at the DISS test facility at the Plataforma Solar de Almería, Spain. Basically, larger vertical and downwards inclined pipe sections increase the probability of severe slugging. Severe slugging can be strongly suppressed by a high pressure operation. In a pipe geometry that shows easily severe slugging a pressure of P⩾60P⩾60 bar prevents severe slugging. In the case of a specific pipe geometry of the DISS test facility, a pressure of P⩾30P⩾30 bar is sufficient to have a non-oscillating flow behaviour.

Item URL in elib:https://elib.dlr.de/104259/
Document Type:Article
Title:Numerical investigation of severe slugging under conditions of a parabolic trough power plant with direct steam generation
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Hirsch, TobiasUNSPECIFIEDhttps://orcid.org/0000-0003-0063-0128UNSPECIFIED
Pitz-Paal, RobertUNSPECIFIEDhttps://orcid.org/0000-0002-3542-3391UNSPECIFIED
Date:August 2016
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 567-585
Keywords:Severe slugging Parabolic trough Direct steam generation ATHLET
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Advanced Heat Transfer Media (old)
Location: Köln-Porz , Stuttgart
Institutes and Institutions:Institute of Solar Research > Linienfokussierende Systeme
Institute of Solar Research > Leitungsbereich SF KP
Deposited By: Hirsch, Dr.-Ing. Tobias
Deposited On:23 May 2016 09:36
Last Modified:23 May 2016 09:36

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