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Process modelling and heat management of the solar hybrid sulfur cycle

Guerra Niehoff, Alejandro and Bayer Botero, Nicolas and Acharya, Anirudh and Thomey, Dennis and Roeb, Martin and Sattler, Christian and Pitz-Paal, Robert (2015) Process modelling and heat management of the solar hybrid sulfur cycle. International Journal of Hydrogen Energy, 40, pp. 4461-4473. Elsevier. DOI: 10.1016/j.ijhydene.2015.01.168 ISSN 0360-3199

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Abstract

Thermochemical cycles for water splitting are considered as a promising example of emission-free routes for large-scale hydrogen production e with potentially higher efficiencies and lower costs compared to low temperature electrolysis of water. The hybrid esulfur cycle was chosen as one of the most promising cycles from the ‘sulfur family’ of processes. A process model has been established to study the main parameters influencing efficiency with specific attention paid to dynamic effects when coupled to solar heat. The process is separated into two sections e one at steady-state, and the other one fictively imposed by transients. This allows a first analysis with respect to reasonable energy and mass flow management, while considering concepts of coupling such a process to a concentrating solar system in a later step. Process efficiencies are calculated based on conservative assumptions, revealing the most important development tasks for the future. The extensive usage of recoverable high temperature heat e including the heat from the highly corrosive condensing phases e is a key factor to attain reasonable efficiencies for industrial application. With idealised heat recovery rates e limited by thermodynamic considerations, but excluding heat exchange between stationary and dynamic sections e and for decomposer temperatures appropriate for olumetric solar Receiver operation, a thermal process efficiency close to 30% is predicted for stationary operation based on the lower heating value of hydrogen. Subsequent investigations will derive annual yields, taking into account the effect of coupling to solar energy.

Item URL in elib:https://elib.dlr.de/95590/
Document Type:Article
Title:Process modelling and heat management of the solar hybrid sulfur cycle
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Guerra Niehoff, Alejandroalejandro.guerra (at) dlr.deUNSPECIFIED
Bayer Botero, NicolasUniversität HeidelbergUNSPECIFIED
Acharya, AnirudhUNSPECIFIEDUNSPECIFIED
Thomey, Dennisdennis.thomey (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.roeb (at) dlr.deUNSPECIFIED
Sattler, Christianchristian.sattler (at) dlr.deUNSPECIFIED
Pitz-Paal, Robertrobert.pitz-paal (at) dlr.deUNSPECIFIED
Date:26 February 2015
Journal or Publication Title:International Journal of Hydrogen Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:40
DOI :10.1016/j.ijhydene.2015.01.168
Page Range:pp. 4461-4473
Publisher:Elsevier
ISSN:0360-3199
Status:Published
Keywords:Thermochemical cycle Hybrid sulfur Flow sheet Solar tower Volumetric receiver Sulfuric acid
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:24 Mar 2015 14:08
Last Modified:24 Mar 2015 14:08

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