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Numerical simulation of multiphase flow and collision humidification in the multifluid alkaline spray generator for a novel semidry flue gas desulfurization system / Yuegui Zhou in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4861–4869 Titre : Numerical simulation of multiphase flow and collision humidification in the multifluid alkaline spray generator for a novel semidry flue gas desulfurization system Type de document : texte imprimé Auteurs : Yuegui Zhou, Auteur ; Weicheng Cao, Auteur ; Lei Wang, Auteur ; Mingchuan Zhang, Auteur Année de publication : 2008 Article en page(s) : p. 4861–4869 Langues : Anglais (eng) Mots-clés : Multifluid  alkaline  spray  generator;  Multiphase  flow;  Desulfurization  system Résumé : A hybrid Eulerian−Lagrangian model was developed to simulate gas−droplet−particle multiphase flow and the collision humidification between sorbent particles and spray droplets in the confined multifluid alkaline spray generator for a novel semidry flue gas desulfurization system. In this model, the motions of discrete phases were tracked simultaneously by using a stochastic trajectory approach, and a probability model of droplets catching particles was presented to judge whether sorbent particles were caught with direct simulation Monte Carlo method. Numerical humidification efficiency of sorbent particles is validated by the experimental one deduced from the measured desulfurization efficiency. And the effects of flue gas flow rate, spray droplet diameter, sorbent particle diameter, and particle injection location on the humidification efficiency were optimized. Numerical results show that the collision humidification efficiency of sorbent particles increases significantly at the axial distance of 1.67 times the generator diameter from the nozzle tip and reaches 78.5% without recirculation flow in the alkaline spray generator when the ratio of flue gas mass flow rate to spray water mass flow rate is 6.7. Moreover, there is an optimal droplet diameter ranging from 125 to 150 µm and an optimal particle injection location corresponding to the maximum humidification efficiency in this paper. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071494c [article] Numerical simulation of multiphase flow and collision humidification in the multifluid alkaline spray generator for a novel semidry flue gas desulfurization system [texte imprimé] / Yuegui Zhou, Auteur ; Weicheng Cao, Auteur ; Lei Wang, Auteur ; Mingchuan Zhang, Auteur . - 2008 . - p. 4861–4869. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4861–4869 Mots-clés : Multifluid  alkaline  spray  generator;  Multiphase  flow;  Desulfurization  system Résumé : A hybrid Eulerian−Lagrangian model was developed to simulate gas−droplet−particle multiphase flow and the collision humidification between sorbent particles and spray droplets in the confined multifluid alkaline spray generator for a novel semidry flue gas desulfurization system. In this model, the motions of discrete phases were tracked simultaneously by using a stochastic trajectory approach, and a probability model of droplets catching particles was presented to judge whether sorbent particles were caught with direct simulation Monte Carlo method. Numerical humidification efficiency of sorbent particles is validated by the experimental one deduced from the measured desulfurization efficiency. And the effects of flue gas flow rate, spray droplet diameter, sorbent particle diameter, and particle injection location on the humidification efficiency were optimized. Numerical results show that the collision humidification efficiency of sorbent particles increases significantly at the axial distance of 1.67 times the generator diameter from the nozzle tip and reaches 78.5% without recirculation flow in the alkaline spray generator when the ratio of flue gas mass flow rate to spray water mass flow rate is 6.7. Moreover, there is an optimal droplet diameter ranging from 125 to 150 µm and an optimal particle injection location corresponding to the maximum humidification efficiency in this paper. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071494c

Study on multiphase flow and mixing in semidry flue gas desulfurization with a multifluid alkaline spray generator using particle image velocimetry / Yuegui Zhou in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5808–5815 Titre : Study on multiphase flow and mixing in semidry flue gas desulfurization with a multifluid alkaline spray generator using particle image velocimetry Type de document : texte imprimé Auteurs : Yuegui Zhou, Auteur ; Dongfu Wang, Auteur ; Mingchuan Zhang, Auteur Année de publication : 2009 Article en page(s) : pp. 5808–5815 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Particle  image  velocimetry  Gas-droplet-solid  multiphase  flow  Gas  desulfurization  process  Multifluid  alkaline  spray  generator Résumé : Particle image velocimetry (PIV) technique was used to measure the velocity fields of gas−droplet−solid multiphase flow in the experimental setup of a novel semidry flue gas desulfurization process with a multifluid alkaline spray generator. The flow structure, mixing characteristic, and interphase interaction of gas−droplet−solid multiphase flow were investigated both in the confined alkaline spray generator and in the duct bent pipe section. The results show that sorbent particles in the confined alkaline spray generator are entrained into the spray core zone by a high-speed spray jet and most of the sorbent particles can be effectively humidified by spray water fine droplets to form aqueous lime slurry droplets. Moreover, a minimum amount of air stream in the generator is necessary to achieve higher collision humidification efficiency between sorbent particles and spray water droplets and to prevent the possible deposition of fine droplets on the wall. The appropriate penetration length of the slurry droplets from the generator can make uniform mixing between the formed slurry droplets and main air stream in the duct bent pipe section, which is beneficial to improving sulfur dioxide removal efficiency and to preventing the deposition of droplets on the wall. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8019714 [article] Study on multiphase flow and mixing in semidry flue gas desulfurization with a multifluid alkaline spray generator using particle image velocimetry [texte imprimé] / Yuegui Zhou, Auteur ; Dongfu Wang, Auteur ; Mingchuan Zhang, Auteur . - 2009 . - pp. 5808–5815. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5808–5815 Mots-clés : Particle  image  velocimetry  Gas-droplet-solid  multiphase  flow  Gas  desulfurization  process  Multifluid  alkaline  spray  generator Résumé : Particle image velocimetry (PIV) technique was used to measure the velocity fields of gas−droplet−solid multiphase flow in the experimental setup of a novel semidry flue gas desulfurization process with a multifluid alkaline spray generator. The flow structure, mixing characteristic, and interphase interaction of gas−droplet−solid multiphase flow were investigated both in the confined alkaline spray generator and in the duct bent pipe section. The results show that sorbent particles in the confined alkaline spray generator are entrained into the spray core zone by a high-speed spray jet and most of the sorbent particles can be effectively humidified by spray water fine droplets to form aqueous lime slurry droplets. Moreover, a minimum amount of air stream in the generator is necessary to achieve higher collision humidification efficiency between sorbent particles and spray water droplets and to prevent the possible deposition of fine droplets on the wall. The appropriate penetration length of the slurry droplets from the generator can make uniform mixing between the formed slurry droplets and main air stream in the duct bent pipe section, which is beneficial to improving sulfur dioxide removal efficiency and to preventing the deposition of droplets on the wall. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8019714