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Article: Energy and exergy analysis of hydrogen production by solid oxide steam electrolyzer plant

TitleEnergy and exergy analysis of hydrogen production by solid oxide steam electrolyzer plant
Authors
KeywordsExergy analysis
Irreversibility
SOSE hydrogen production
Waste heat recovery
Issue Date2007
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijhydene
Citation
International Journal Of Hydrogen Energy, 2007, v. 32 n. 18, p. 4648-4660 How to Cite?
AbstractEnergy and exergy analysis has been conducted to investigate the thermodynamic-electrochemical characteristics of hydrogen production by a solid oxide steam electrolyzer (SOSE) plant. All overpotentials involved in the SOSE cell have been included in the thermodynamic model. The waste heat in the gas stream of the SOSE outlet is recovered to preheat the H2O stream by a heat exchanger. The heat production by the SOSE cell due to irreversible losses has been investigated and compared with the SOSE cell's thermal energy demand. It is found that the SOSE cell normally operates in an endothermic mode at a high temperature while it is more likely to operate in an exothermic mode at a low temperature as the heat production due to overpotentials exceeds the thermal energy demand. A diagram of energy and exergy flows in the SOSE plant helps to identify the sources and quantify the energy and exergy losses. The exergy analysis reveals that the SOSE cell is the major source of exergy destruction. The energy analysis shows that the energy loss is mainly caused by inefficiency of the heat exchangers. The effects of some important operating parameters, such as temperature, current density, and H2O flow rate, on the plant efficiency have been studied. Optimization of these parameters can achieve maximum energy and exergy efficiencies. The findings show that the difference between energy efficiency and exergy efficiency is small as the high-temperature thermal energy input is only a small fraction of the total energy input. In addition, the high-temperature waste heat is of high quality and can be recovered. In contrast, for a low-temperature electrolysis plant, the difference between the energy and exergy efficiencies is more apparent because considerable amount of low-temperature waste heat contains little exergy and cannot be recovered effectively. This study provides a better understanding of the energy and exergy flows in SOSE hydrogen production and demonstrates the importance of exergy analysis for identifying and quantifying the exergy destruction. The findings of the present study can further be applied to perform process optimization to maximize the cost-effectiveness of SOSE hydrogen production. © 2007 International Association for Hydrogen Energy.
Persistent Identifierhttp://hdl.handle.net/10722/75910
ISSN
2015 Impact Factor: 3.205
2015 SCImago Journal Rankings: 1.330
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorNi, Men_HK
dc.contributor.authorLeung, MKHen_HK
dc.contributor.authorLeung, DYCen_HK
dc.date.accessioned2010-09-06T07:15:45Z-
dc.date.available2010-09-06T07:15:45Z-
dc.date.issued2007en_HK
dc.identifier.citationInternational Journal Of Hydrogen Energy, 2007, v. 32 n. 18, p. 4648-4660en_HK
dc.identifier.issn0360-3199en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75910-
dc.description.abstractEnergy and exergy analysis has been conducted to investigate the thermodynamic-electrochemical characteristics of hydrogen production by a solid oxide steam electrolyzer (SOSE) plant. All overpotentials involved in the SOSE cell have been included in the thermodynamic model. The waste heat in the gas stream of the SOSE outlet is recovered to preheat the H2O stream by a heat exchanger. The heat production by the SOSE cell due to irreversible losses has been investigated and compared with the SOSE cell's thermal energy demand. It is found that the SOSE cell normally operates in an endothermic mode at a high temperature while it is more likely to operate in an exothermic mode at a low temperature as the heat production due to overpotentials exceeds the thermal energy demand. A diagram of energy and exergy flows in the SOSE plant helps to identify the sources and quantify the energy and exergy losses. The exergy analysis reveals that the SOSE cell is the major source of exergy destruction. The energy analysis shows that the energy loss is mainly caused by inefficiency of the heat exchangers. The effects of some important operating parameters, such as temperature, current density, and H2O flow rate, on the plant efficiency have been studied. Optimization of these parameters can achieve maximum energy and exergy efficiencies. The findings show that the difference between energy efficiency and exergy efficiency is small as the high-temperature thermal energy input is only a small fraction of the total energy input. In addition, the high-temperature waste heat is of high quality and can be recovered. In contrast, for a low-temperature electrolysis plant, the difference between the energy and exergy efficiencies is more apparent because considerable amount of low-temperature waste heat contains little exergy and cannot be recovered effectively. This study provides a better understanding of the energy and exergy flows in SOSE hydrogen production and demonstrates the importance of exergy analysis for identifying and quantifying the exergy destruction. The findings of the present study can further be applied to perform process optimization to maximize the cost-effectiveness of SOSE hydrogen production. © 2007 International Association for Hydrogen Energy.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijhydeneen_HK
dc.relation.ispartofInternational Journal of Hydrogen Energyen_HK
dc.subjectExergy analysisen_HK
dc.subjectIrreversibilityen_HK
dc.subjectSOSE hydrogen productionen_HK
dc.subjectWaste heat recoveryen_HK
dc.titleEnergy and exergy analysis of hydrogen production by solid oxide steam electrolyzer planten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0360-3199&volume=32&spage=4648&epage=4660&date=2007&atitle=Energy+and+exergy+analysis+of+hydrogen+production+by+solid+oxide+steam+electrolyzer+planten_HK
dc.identifier.emailLeung, MKH:en_HK
dc.identifier.emailLeung, DYC: ycleung@hku.hken_HK
dc.identifier.authorityLeung, MKH=rp00148en_HK
dc.identifier.authorityLeung, DYC=rp00149en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ijhydene.2007.08.005en_HK
dc.identifier.scopuseid_2-s2.0-36549080993en_HK
dc.identifier.hkuros146113en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-36549080993&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume32en_HK
dc.identifier.issue18en_HK
dc.identifier.spage4648en_HK
dc.identifier.epage4660en_HK
dc.identifier.isiWOS:000252259500005-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridNi, M=9268339800en_HK
dc.identifier.scopusauthoridLeung, MKH=8862966600en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK
dc.identifier.citeulike1840654-

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