Modeling of low-temperature reduction of metal oxide in hydrogen treatment system for severe accidents in nuclear power plants

In the accident at the Fukushima Daiichi Nuclear Power Station, reaction of water vapor with hot zirconium led to the generation of hydrogen and a subsequent explosion in the reactor building. From the perspective of defense-in-depth, multiple hydrogen explosion prevention measures are desirable to...

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Autores principales:	Kotaro NAKAMURA, Masashi TANABE, Satoru ABE, Takashi MAWATARI, Takao NAKAGAKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2021
Materias:	surface reactions adsorption-desorption fixed-bed reactor pore network nuclear safety Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/419c49c905684da79b223d5e4e7a729d
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id	oai:doaj.org-article:419c49c905684da79b223d5e4e7a729d
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spelling	oai:doaj.org-article:419c49c905684da79b223d5e4e7a729d2021-11-29T06:09:58ZModeling of low-temperature reduction of metal oxide in hydrogen treatment system for severe accidents in nuclear power plants2187-974510.1299/mej.21-00005https://doaj.org/article/419c49c905684da79b223d5e4e7a729d2021-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/8/4/8_21-00005/_pdf/-char/enhttps://doaj.org/toc/2187-9745In the accident at the Fukushima Daiichi Nuclear Power Station, reaction of water vapor with hot zirconium led to the generation of hydrogen and a subsequent explosion in the reactor building. From the perspective of defense-in-depth, multiple hydrogen explosion prevention measures are desirable to improve the safety of nuclear power generation. In this research, we focus on a hydrogen treatment system that re-oxidizes hydrogen into water vapor using a fixed, packed bed of copper oxide pellets. The advantages of this method are that the hydrogen oxidation rate is rapid and no external source of oxygen is necessary. In this study, we conducted experiments and complementary numerical calculations for the hydrogen oxidation reaction using copper oxide pellets. The oxidation reaction of hydrogen by copper oxide is decomposed into five elementary reactions, the rate of each was determined experimentally. The resultant numerical calculation accurately modeled experimentally observed hydrogen oxidation rates and provides insights into the phenomena controlling the reaction progression. The results suggest that the commonly observed induction period is due to the presence of poorly adsorbing sites on the copper oxide surface. Moreover, when water vapor is present, competition between water vapor and hydrogen for adsorption sites further suppresses the hydrogen oxidation reactions.Kotaro NAKAMURAMasashi TANABESatoru ABETakashi MAWATARITakao NAKAGAKIThe Japan Society of Mechanical Engineersarticlesurface reactionsadsorption-desorptionfixed-bed reactorpore networknuclear safetyMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 8, Iss 4, Pp 21-00005-21-00005 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	surface reactions adsorption-desorption fixed-bed reactor pore network nuclear safety Mechanical engineering and machinery TJ1-1570
spellingShingle	surface reactions adsorption-desorption fixed-bed reactor pore network nuclear safety Mechanical engineering and machinery TJ1-1570 Kotaro NAKAMURA Masashi TANABE Satoru ABE Takashi MAWATARI Takao NAKAGAKI Modeling of low-temperature reduction of metal oxide in hydrogen treatment system for severe accidents in nuclear power plants
description	In the accident at the Fukushima Daiichi Nuclear Power Station, reaction of water vapor with hot zirconium led to the generation of hydrogen and a subsequent explosion in the reactor building. From the perspective of defense-in-depth, multiple hydrogen explosion prevention measures are desirable to improve the safety of nuclear power generation. In this research, we focus on a hydrogen treatment system that re-oxidizes hydrogen into water vapor using a fixed, packed bed of copper oxide pellets. The advantages of this method are that the hydrogen oxidation rate is rapid and no external source of oxygen is necessary. In this study, we conducted experiments and complementary numerical calculations for the hydrogen oxidation reaction using copper oxide pellets. The oxidation reaction of hydrogen by copper oxide is decomposed into five elementary reactions, the rate of each was determined experimentally. The resultant numerical calculation accurately modeled experimentally observed hydrogen oxidation rates and provides insights into the phenomena controlling the reaction progression. The results suggest that the commonly observed induction period is due to the presence of poorly adsorbing sites on the copper oxide surface. Moreover, when water vapor is present, competition between water vapor and hydrogen for adsorption sites further suppresses the hydrogen oxidation reactions.
format	article
author	Kotaro NAKAMURA Masashi TANABE Satoru ABE Takashi MAWATARI Takao NAKAGAKI
author_facet	Kotaro NAKAMURA Masashi TANABE Satoru ABE Takashi MAWATARI Takao NAKAGAKI
author_sort	Kotaro NAKAMURA
title	Modeling of low-temperature reduction of metal oxide in hydrogen treatment system for severe accidents in nuclear power plants
title_short	Modeling of low-temperature reduction of metal oxide in hydrogen treatment system for severe accidents in nuclear power plants
title_full	Modeling of low-temperature reduction of metal oxide in hydrogen treatment system for severe accidents in nuclear power plants
title_fullStr	Modeling of low-temperature reduction of metal oxide in hydrogen treatment system for severe accidents in nuclear power plants
title_full_unstemmed	Modeling of low-temperature reduction of metal oxide in hydrogen treatment system for severe accidents in nuclear power plants
title_sort	modeling of low-temperature reduction of metal oxide in hydrogen treatment system for severe accidents in nuclear power plants
publisher	The Japan Society of Mechanical Engineers
publishDate	2021
url	https://doaj.org/article/419c49c905684da79b223d5e4e7a729d
work_keys_str_mv	AT kotaronakamura modelingoflowtemperaturereductionofmetaloxideinhydrogentreatmentsystemforsevereaccidentsinnuclearpowerplants AT masashitanabe modelingoflowtemperaturereductionofmetaloxideinhydrogentreatmentsystemforsevereaccidentsinnuclearpowerplants AT satoruabe modelingoflowtemperaturereductionofmetaloxideinhydrogentreatmentsystemforsevereaccidentsinnuclearpowerplants AT takashimawatari modelingoflowtemperaturereductionofmetaloxideinhydrogentreatmentsystemforsevereaccidentsinnuclearpowerplants AT takaonakagaki modelingoflowtemperaturereductionofmetaloxideinhydrogentreatmentsystemforsevereaccidentsinnuclearpowerplants
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Modeling of low-temperature reduction of metal oxide in hydrogen treatment system for severe accidents in nuclear power plants

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