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Hydrogen monitoring in the heat transfer fluid of parabolic trough plants

Jung, Christian and Senholdt, Marion and Spenke, Carsten and Schmidt, Thomas and Ulmer, Steffen (2019) Hydrogen monitoring in the heat transfer fluid of parabolic trough plants. In: AIP Conference Proceedings, 2126, 080004. American Institute of Physics. SolarPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems, 2.–5. Okt. 2018, Casablanca, Marokko. DOI: 10.1063/1.5117599 ISBN 978-0-7354-1866-0

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Official URL: https://aip.scitation.org/doi/10.1063/1.5117599

Abstract

The hydrogen formation of diphenyl oxide (DPO) / biphenyl (BP) based heat transfer fluids (HTFs) can cause undesirably high concentrations of the gas in the HTF system of solar thermal parabolic trough plants. Hydrogen permeates from the HTF into the vacuum insulation of the heat collecting elements (HCEs). Excessive hydrogen concentrations in the HTF cause early saturation of the getter materials in the HCEs and consequently to high thermal losses when the heat insulation effect of the vacuum gets lost. In order to avoid a hydrogen problem the concentration of the gas has to be monitored and controlled in the HTF. In this study hydrogen analysis has been performed with HTF samples that were collected including all dissolved gases using special steel cylinders that were directly connected to the HTF system. The samples were analysed off-line at ambient conditions in a lab applying a combination of pressure measurement and compositional analysis with gas chromatography. The results indicate that under regular operating conditions hydrogen can exceed the specified limit more than hundredfold. Decompression tests in a CSP plant also indicate that hydrogen concentrations can be lowered using ready available components of a parabolic trough plant. Hence, extremely high hydrogen levels can be avoided by sufficient nitrogen exchange.

Item URL in elib:https://elib.dlr.de/128840/
Document Type:Conference or Workshop Item (Speech)
Title:Hydrogen monitoring in the heat transfer fluid of parabolic trough plants
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jung, ChristianChristian.Jung (at) dlr.dehttps://orcid.org/0000-0002-5893-4979
Senholdt, Marionmarion.senholdt (at) dlr.deUNSPECIFIED
Spenke, Carstencarsten.spenke (at) dlr.deUNSPECIFIED
Schmidt, ThomasCSP ServicesUNSPECIFIED
Ulmer, SteffenCSP ServicesUNSPECIFIED
Date:25 July 2019
Journal or Publication Title:AIP Conference Proceedings
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:2126
DOI :10.1063/1.5117599
Page Range:080004
Editors:
EditorsEmail
Richter, Christophchristoph.richter@dlr.de
Publisher:American Institute of Physics
Series Name:AIP Conference Proceedings
ISBN:978-0-7354-1866-0
Status:Published
Keywords:heat transfer fluid, HTF, hydrogen, hydrogen limit, parabolic trough plant, CSP, biphenyl, BP, diphenyl ether, diphenyl oxide, DPO
Event Title:SolarPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems
Event Location:Casablanca, Marokko
Event Type:international Conference
Event Dates:2.–5. Okt. 2018
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Solar Fuels
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solar Chemical Engineering
Deposited By: Jung, Dr.rer.nat. Christian
Deposited On:22 Aug 2019 09:59
Last Modified:22 Aug 2019 09:59

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