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Cracking and coking behaviors of nascent volatiles derived from flash pyrolysis of woody biomass over mesoporous fluidized-bed material / Koji Kuramoto in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2851–2860 Titre : Cracking and coking behaviors of nascent volatiles derived from flash pyrolysis of woody biomass over mesoporous fluidized-bed material Type de document : texte imprimé Auteurs : Koji Kuramoto, Auteur ; Koichi Matsuoka, Auteur ; Takahiro Murakami, Auteur Année de publication : 2009 Article en page(s) : pp. 2851–2860 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Woody  biomass  gasification  Dual-bubbling  fluidized-bed  gasification  system  Catalytic  porous  γ-alumina  Biomass  pyrolysis/steam  gasification  zoneChar/coke  combustion  zone Résumé : To increase the calorific value of the gaseous product from the woody biomass gasification process, a circulating dual-bubbling fluidized-bed gasification system based on the concept of physical separation of the combustion zone from the gasification zone has been proposed. To cope with the difficulty in control of the tar behavior, a catalytic porous γ-alumina has been considered as a bed material for the above process, which circulates between the biomass pyrolysis/steam gasification zone and the char/coke combustion zone, capturing tar vapor as coke on its surface catalytically in the gasifier. Preliminary process simulation clarified the minimum amount of carbonaceous portion (char and coke) in the biomass that must be burnt in the combustor for a thermally self-sustained process operation, suggesting that the coke derived from tar deposited over γ-alumina should be distributed to combustion and gasification zones by controlling the extent of the steam gasification of coke. To develop a method to control the tar conversion during pyrolysis and gasification, we examined the effects of porous γ-alumina on the tar behavior in the secondary reaction in a two-stage bubbling fluidized-bed reactor. Both gasification tests and Brunauer−Emmett−Teller analyses revealed that porous γ-alumina was markedly catalytic toward coking and dehydrogenation of the tar vapor, until a substantial amount of coke had deposited on the catalyst, thus occluding pores. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800760s [article] Cracking and coking behaviors of nascent volatiles derived from flash pyrolysis of woody biomass over mesoporous fluidized-bed material [texte imprimé] / Koji Kuramoto, Auteur ; Koichi Matsuoka, Auteur ; Takahiro Murakami, Auteur . - 2009 . - pp. 2851–2860. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2851–2860 Mots-clés : Woody  biomass  gasification  Dual-bubbling  fluidized-bed  gasification  system  Catalytic  porous  γ-alumina  Biomass  pyrolysis/steam  gasification  zoneChar/coke  combustion  zone Résumé : To increase the calorific value of the gaseous product from the woody biomass gasification process, a circulating dual-bubbling fluidized-bed gasification system based on the concept of physical separation of the combustion zone from the gasification zone has been proposed. To cope with the difficulty in control of the tar behavior, a catalytic porous γ-alumina has been considered as a bed material for the above process, which circulates between the biomass pyrolysis/steam gasification zone and the char/coke combustion zone, capturing tar vapor as coke on its surface catalytically in the gasifier. Preliminary process simulation clarified the minimum amount of carbonaceous portion (char and coke) in the biomass that must be burnt in the combustor for a thermally self-sustained process operation, suggesting that the coke derived from tar deposited over γ-alumina should be distributed to combustion and gasification zones by controlling the extent of the steam gasification of coke. To develop a method to control the tar conversion during pyrolysis and gasification, we examined the effects of porous γ-alumina on the tar behavior in the secondary reaction in a two-stage bubbling fluidized-bed reactor. Both gasification tests and Brunauer−Emmett−Teller analyses revealed that porous γ-alumina was markedly catalytic toward coking and dehydrogenation of the tar vapor, until a substantial amount of coke had deposited on the catalyst, thus occluding pores. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800760s