Experimental study on a methanol auto-thermal reforming for compact reformer

Performance of self-sustaining methanol auto-thermal reforming (ATR) was investigated experimentally in order to elucidate a reforming reaction mechanism and a condition required for high purity H2 production for compact reformer. The reformer consists of vaporizing and reforming sections in a sing...

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Autores principales:	Jun OHTANI, Takahiro SAKAMOTO, Masayoshi WADA, Hasan Mohd FAIZAL, Takeshi YOKOMORI, Toshihisa UEDA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2016
Materias:	methanol steam reforming partial oxidation total oxidation auto-thermal reforming hydrogen oxygen/carbon ratio steam/carbon ratio Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/1a216c4aafb34763a8e179dbae434c6a
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spelling	oai:doaj.org-article:1a216c4aafb34763a8e179dbae434c6a2021-11-26T06:40:17ZExperimental study on a methanol auto-thermal reforming for compact reformer2187-974510.1299/mej.15-00069https://doaj.org/article/1a216c4aafb34763a8e179dbae434c6a2016-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/3/2/3_15-00069/_pdf/-char/enhttps://doaj.org/toc/2187-9745Performance of self-sustaining methanol auto-thermal reforming (ATR) was investigated experimentally in order to elucidate a reforming reaction mechanism and a condition required for high purity H2 production for compact reformer. The reformer consists of vaporizing and reforming sections in a single unit. The exothermic oxidation and endothermic steam reforming (STR) take place simultaneously in the reforming section. The reforming section is surrounded by the vaporizing section and then the heat for vaporization is supplied from the reforming section. Two types of exothermic oxidation reaction were investigated as the heat source for STR; one is a partial oxidation (POX) and the other is a total oxidation (TOX). CuO/ZnO/Al2O3 catalyst and Pt/Al2O3 catalyst were used for STR and POX, respectively. While, only CuO/ZnO/Al2O3 catalyst was needed for TOX because TOX took place when fuel and oxygen were supplied to the CuO/ZnO/Al2O3 catalyst. Experiments were investigated in the range of oxygen/carbon ratio (O/C ratio) 0.1-1.5, steam/carbon ratio (S/C ratio) 1.0-3.0 and N2 mole ratio 79-50 % in oxidizer. The results showed that the H2 formation reached maximum at around O/C=0.4 in both STR/POX and STR/TOX cases in the present study. When O/C ratio is decreased from 0.4, heat formation by the oxidation reactions decreases and is insufficient to reform residual CH3OH by STR. As a result, H2 formation and the methanol conversion ratio decrease. When O/C ratio is increased from 0.4, the H2 formation decreases, because methanol is consumed with the excess O2 by TOX and CH3OH for STR decreases. After all, O/C=0.4 gives an appropriate balance of heat supply and methanol for H2 production. These results elucidate that the reaction rate of oxidation reactions, POX and TOX, is much faster than that of STR. In other words, methanol is first consumed by the oxidation reaction and the residual methanol is used for STR. For S/C ratio, H2 formation is decreased in the higher S/C ratio. N2 mole ratio in oxidizer has few influence over the reforming gas. The chemical equilibrium calculations support the experimental results.Jun OHTANITakahiro SAKAMOTOMasayoshi WADAHasan Mohd FAIZALTakeshi YOKOMORIToshihisa UEDAThe Japan Society of Mechanical Engineersarticlemethanolsteam reformingpartial oxidationtotal oxidationauto-thermal reforminghydrogenoxygen/carbon ratiosteam/carbon ratioMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 3, Iss 2, Pp 15-00069-15-00069 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	methanol steam reforming partial oxidation total oxidation auto-thermal reforming hydrogen oxygen/carbon ratio steam/carbon ratio Mechanical engineering and machinery TJ1-1570
spellingShingle	methanol steam reforming partial oxidation total oxidation auto-thermal reforming hydrogen oxygen/carbon ratio steam/carbon ratio Mechanical engineering and machinery TJ1-1570 Jun OHTANI Takahiro SAKAMOTO Masayoshi WADA Hasan Mohd FAIZAL Takeshi YOKOMORI Toshihisa UEDA Experimental study on a methanol auto-thermal reforming for compact reformer
description	Performance of self-sustaining methanol auto-thermal reforming (ATR) was investigated experimentally in order to elucidate a reforming reaction mechanism and a condition required for high purity H2 production for compact reformer. The reformer consists of vaporizing and reforming sections in a single unit. The exothermic oxidation and endothermic steam reforming (STR) take place simultaneously in the reforming section. The reforming section is surrounded by the vaporizing section and then the heat for vaporization is supplied from the reforming section. Two types of exothermic oxidation reaction were investigated as the heat source for STR; one is a partial oxidation (POX) and the other is a total oxidation (TOX). CuO/ZnO/Al2O3 catalyst and Pt/Al2O3 catalyst were used for STR and POX, respectively. While, only CuO/ZnO/Al2O3 catalyst was needed for TOX because TOX took place when fuel and oxygen were supplied to the CuO/ZnO/Al2O3 catalyst. Experiments were investigated in the range of oxygen/carbon ratio (O/C ratio) 0.1-1.5, steam/carbon ratio (S/C ratio) 1.0-3.0 and N2 mole ratio 79-50 % in oxidizer. The results showed that the H2 formation reached maximum at around O/C=0.4 in both STR/POX and STR/TOX cases in the present study. When O/C ratio is decreased from 0.4, heat formation by the oxidation reactions decreases and is insufficient to reform residual CH3OH by STR. As a result, H2 formation and the methanol conversion ratio decrease. When O/C ratio is increased from 0.4, the H2 formation decreases, because methanol is consumed with the excess O2 by TOX and CH3OH for STR decreases. After all, O/C=0.4 gives an appropriate balance of heat supply and methanol for H2 production. These results elucidate that the reaction rate of oxidation reactions, POX and TOX, is much faster than that of STR. In other words, methanol is first consumed by the oxidation reaction and the residual methanol is used for STR. For S/C ratio, H2 formation is decreased in the higher S/C ratio. N2 mole ratio in oxidizer has few influence over the reforming gas. The chemical equilibrium calculations support the experimental results.
format	article
author	Jun OHTANI Takahiro SAKAMOTO Masayoshi WADA Hasan Mohd FAIZAL Takeshi YOKOMORI Toshihisa UEDA
author_facet	Jun OHTANI Takahiro SAKAMOTO Masayoshi WADA Hasan Mohd FAIZAL Takeshi YOKOMORI Toshihisa UEDA
author_sort	Jun OHTANI
title	Experimental study on a methanol auto-thermal reforming for compact reformer
title_short	Experimental study on a methanol auto-thermal reforming for compact reformer
title_full	Experimental study on a methanol auto-thermal reforming for compact reformer
title_fullStr	Experimental study on a methanol auto-thermal reforming for compact reformer
title_full_unstemmed	Experimental study on a methanol auto-thermal reforming for compact reformer
title_sort	experimental study on a methanol auto-thermal reforming for compact reformer
publisher	The Japan Society of Mechanical Engineers
publishDate	2016
url	https://doaj.org/article/1a216c4aafb34763a8e179dbae434c6a
work_keys_str_mv	AT junohtani experimentalstudyonamethanolautothermalreformingforcompactreformer AT takahirosakamoto experimentalstudyonamethanolautothermalreformingforcompactreformer AT masayoshiwada experimentalstudyonamethanolautothermalreformingforcompactreformer AT hasanmohdfaizal experimentalstudyonamethanolautothermalreformingforcompactreformer AT takeshiyokomori experimentalstudyonamethanolautothermalreformingforcompactreformer AT toshihisaueda experimentalstudyonamethanolautothermalreformingforcompactreformer
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Experimental study on a methanol auto-thermal reforming for compact reformer

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