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Experimental and numerical investigations on the electrostatics generation and transport in the downer reactor of a triple-bed combined circulating fluidized bed / Yongpan Cheng in Industrial & engineering chemistry research, Vol. 51 N° 43 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14258-14267 Titre : Experimental and numerical investigations on the electrostatics generation and transport in the downer reactor of a triple-bed combined circulating fluidized bed Type de document : texte imprimé Auteurs : Yongpan Cheng, Auteur ; Darren Yan Jun Lau, Auteur ; Guoqing Guan, Auteur Année de publication : 2013 Article en page(s) : pp. 14258-14267 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Circulating  fluidized  bed  Fluidization  Rector  Downer  Transport  process Résumé : Electrostatics is an inevitable phenomenon in fluidization processes and granular flow systems where collisions between particulates and walls with different materials occur. In this study, the electrostatic performance in the downer reactor of a triple-bed combined circulating fluidized bed was investigated through both experiments and numerical simulations. In numerical simulation the Discrete Element Method (DEM) was adopted to simulate the electrostatic charge generation and transfer occurring in the downer. Both experimental and numerical results showed that the averaged induced currents caused by electrostatics increased with increasing solids mass flux in the downer, and the electrostatics was the strongest near the entrance of the downer because of the highest frequency of collisions between particles and the wall caused by the largest solids holdup at that location. Numerical studies also revealed that the averaged induced currents increased with increasing initial particle velocity and particle size, and the averaged induced current caused by the charge transfer was much larger than those by charge generation through tribocharging. These results may help us better understand the mechanism of electrostatic phenomena, and better cope with challenges and problems caused by electrostatics. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593353 [article] Experimental and numerical investigations on the electrostatics generation and transport in the downer reactor of a triple-bed combined circulating fluidized bed [texte imprimé] / Yongpan Cheng, Auteur ; Darren Yan Jun Lau, Auteur ; Guoqing Guan, Auteur . - 2013 . - pp. 14258-14267. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14258-14267 Mots-clés : Circulating  fluidized  bed  Fluidization  Rector  Downer  Transport  process Résumé : Electrostatics is an inevitable phenomenon in fluidization processes and granular flow systems where collisions between particulates and walls with different materials occur. In this study, the electrostatic performance in the downer reactor of a triple-bed combined circulating fluidized bed was investigated through both experiments and numerical simulations. In numerical simulation the Discrete Element Method (DEM) was adopted to simulate the electrostatic charge generation and transfer occurring in the downer. Both experimental and numerical results showed that the averaged induced currents caused by electrostatics increased with increasing solids mass flux in the downer, and the electrostatics was the strongest near the entrance of the downer because of the highest frequency of collisions between particles and the wall caused by the largest solids holdup at that location. Numerical studies also revealed that the averaged induced currents increased with increasing initial particle velocity and particle size, and the averaged induced current caused by the charge transfer was much larger than those by charge generation through tribocharging. These results may help us better understand the mechanism of electrostatic phenomena, and better cope with challenges and problems caused by electrostatics. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593353

Transesterification of sunflower oil with methanol in a microtube reactor / Guoqing Guan in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1357–1363 Titre : Transesterification of sunflower oil with methanol in a microtube reactor Type de document : texte imprimé Auteurs : Guoqing Guan, Auteur ; Katsuki Kusakabe, Auteur ; Kimiko Moriyama, Auteur Année de publication : 2009 Article en page(s) : p. 1357–1363 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Sunflower  Oil  --  Transesterification  Methanol  Microtube  Reactor Résumé : Transesterification of sunflower oil with methanol to form fatty acid methyl esters (FAMEs) using a KOH catalyst was performed in a microtube reactor. Oil conversion was significantly affected by microtube length, microtube diameter, the methanol/oil molar ratio, and reaction temperature. Flow patterns were observed in the transparent microtube under different operating conditions and were characterized by optical measurements. The relationship between flow pattern and oil conversion was examined. The flow pattern at the entrance region of the microtube was segmented flow of the methanol and oil phases. As the reaction progressed, fine droplets composed of the produced glycerol and methanol were dispersed and circulated in the oil segments. At a methanol/oil molar ratio of 23.9 at 60 °C, a quasi-homogeneous phase formed approximately 300 mm from the reaction inlet where the oil was completely converted to FAMEs. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800852x [article] Transesterification of sunflower oil with methanol in a microtube reactor [texte imprimé] / Guoqing Guan, Auteur ; Katsuki Kusakabe, Auteur ; Kimiko Moriyama, Auteur . - 2009 . - p. 1357–1363. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1357–1363 Mots-clés : Sunflower  Oil  --  Transesterification  Methanol  Microtube  Reactor Résumé : Transesterification of sunflower oil with methanol to form fatty acid methyl esters (FAMEs) using a KOH catalyst was performed in a microtube reactor. Oil conversion was significantly affected by microtube length, microtube diameter, the methanol/oil molar ratio, and reaction temperature. Flow patterns were observed in the transparent microtube under different operating conditions and were characterized by optical measurements. The relationship between flow pattern and oil conversion was examined. The flow pattern at the entrance region of the microtube was segmented flow of the methanol and oil phases. As the reaction progressed, fine droplets composed of the produced glycerol and methanol were dispersed and circulated in the oil segments. At a methanol/oil molar ratio of 23.9 at 60 °C, a quasi-homogeneous phase formed approximately 300 mm from the reaction inlet where the oil was completely converted to FAMEs. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800852x