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Available online Efficiency potential of indirectly heated solar reforming with different types of solar air receivers

von Storch, Henrik and Roeb, Martin and Stadler, Hannes and Sattler, Christian and Hoffschmidt, Bernhard (2015) Available online Efficiency potential of indirectly heated solar reforming with different types of solar air receivers. Applied Thermal Engineering, 92, pp. 202-209. Elsevier. DOI: 10.1016/j.applthermaleng.2015.09.065 ISSN 1359-4311

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Abstract

In solar reforming, the heating value of natural gas is increased by utilization of concentrated solar radiation. Hence, it is a process for storing solar energy in a stable and transportable form that also permits further conversion into liquid fuels likemethanol. This process has the potential to significantly decrease the natural gas consumption and the associated CO2-emissions of methanol production with only few open questions to be addressed prior to commercialization. In the medium and long term, it has the potential to generate methanol as an environmentally friendly fuel for both transport aswell as flexible electricity production in combined cycle gas turbines, when biogas is used as reactant. In a previous study the high potential of indirectly heated solar reforming with solar air receiverswas shown; however, the efficiency is limited when using state of the art open volumetric receivers. Therefore, different types of air receivers are implemented into an indirectly heated solar reforming process and the overall efficiency potential is assessed in the present study. The implemented receivers are an open volumetric cavity receiver, a closed volumetric cavity receiver and a tubular cavity receiver. The open volumetric cavity receiver and tubular cavity receiver achieve the best results due to their capability of operating efficiently at temperatures well above 700 °C. For these receivers peak efficiencies up to 29% and 27% respectively are predicted. As the utilization of an open volumetric cavity receiver constitutes an open heat transfer loop, the air return ratio together with air return temperature is identified as a major impact factor for overall efficiency. With an improved air return ratio, annual process efficiency of 18.4% is feasible. Considering its relative technical simplicity, this makes indirectly heated solar reforming a promising technology to efficiently provide renewable energy for methanol production and thereby diversify solar energy utilization.

Item URL in elib:https://elib.dlr.de/98829/
Document Type:Article
Title:Available online Efficiency potential of indirectly heated solar reforming with different types of solar air receivers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
von Storch, Henrikhenrik.vonStorch (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.roeb (at) dlr.deUNSPECIFIED
Stadler, Hanneshannes.stadler (at) dlr.deUNSPECIFIED
Sattler, Christianchristian.sattler (at) dlr.deUNSPECIFIED
Hoffschmidt, Bernhardbernhard.hoffschmidt (at) dlr.deUNSPECIFIED
Date:18 September 2015
Journal or Publication Title:Applied Thermal Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:92
DOI :10.1016/j.applthermaleng.2015.09.065
Page Range:pp. 202-209
Publisher:Elsevier
ISSN:1359-4311
Status:Published
Keywords:Solar reforming Solar fuels CSP Process simulation Cavity receivers
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: Jülich , Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Institute of Solar Research > Punktfokussierende Systeme
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:30 Oct 2015 15:35
Last Modified:06 Sep 2019 15:16

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