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Solar Heat and Power for a SOE process

Houaijia, Anis and Roeb, Martin and Monnerie, Nathalie and Säck, Jan-Peter and Breuer, Stefan and Thomey, Dennis and Sattler, Christian (2014) Solar Heat and Power for a SOE process. In: Proceedings EFCF 2014. European Fuel Cell Forum, 1,-4. Jul. 2014, Luzern, Schweiz.

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Abstract

High temperature steam electrolysis (HTSE) in a Solid Oxide Electrolyzer (SOE) involves the splitting of steam into hydrogen and oxygen at high temperatures. The Primary advantage of HTE over conventional low temperature electrolysis is that considerably higher hydrogen production efficiencies can be achieved. Performing the electrolysis process at high temperatures and high pressure results in more favorable thermodynamics for electrolysis, more efficient production of electricity, and allows direct use of process heat to generate steam. This paper related to the EU-JCH project SOPHIA presents the results of process analyses performed to evaluate the hydrogen production efficiencies of an HTSE plant coupled to a Solar Tower working with steam as heat transfer fluid that supplies both the electricity and process heat needed to drive the process. Running the process with direct steam has the benefit of using a heat transfer fluid well suited to generate electricity in a Rankine cycle as well as feed steam for the HTE. Moreover, this process scheme permits the use of steam as sweep gas for the anode in order to maintain reducing conditions. The power conversion unit will be a Rankine steam cycle with a power conversion of 35%.The electrolyser operates at 700°C and 15 bar and utilizes steam as sweep fluid to remove the excess oxygen that is evolved on the anode side. The sweeping steam can be easily separated at the outlet of the electrolyzer by condensation, which offers the benefit of producing oxygen as a valuable byproduct. The Flowsheet of the process has been created and analyzed in addition to the development of a solar test receiver for steam generation accompanied by modeling of this receiver. The receiver was testes in DLR’s high flux solar simulator in Cologne. A tube-type test receiver was developed and tested in DLR’s high flux solar simulator in Cologne.

Item URL in elib:https://elib.dlr.de/91482/
Document Type:Conference or Workshop Item (Speech)
Title:Solar Heat and Power for a SOE process
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Houaijia, Anisanis.houaijia (at) dlr.deUNSPECIFIED
Roeb, Martinmartin.roeb (at) dlr.deUNSPECIFIED
Monnerie, Nathalienathalie.monnerie (at) dlr.deUNSPECIFIED
Säck, Jan-Peterjan-peter.saeck (at) dlr.deUNSPECIFIED
Breuer, Stefanstefan.breuer (at) dlr.deUNSPECIFIED
Thomey, Dennisdennis.thomey (at) dlr.deUNSPECIFIED
Sattler, Christianchristian.sattler (at) dlr.deUNSPECIFIED
Date:1 July 2014
Journal or Publication Title:Proceedings EFCF 2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:High temperature steam electrolysis Solid Oxide Electrolyzer solar high temperature hydrogen
Event Title:European Fuel Cell Forum
Event Location:Luzern, Schweiz
Event Type:international Conference
Event Dates:1,-4. Jul. 2014
Organizer:Fuel Cell Today
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solar Process Technology (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:05 Nov 2014 15:50
Last Modified:05 Nov 2014 15:50

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