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Computations of fluid dynamics of a 50 MWe circulating fluidized bed combustor / Liu Guodong in Industrial & engineering chemistry research, Vol. 49 N° 11 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5132–5140 Titre : Computations of fluid dynamics of a 50 MWe circulating fluidized bed combustor Type de document : texte imprimé Auteurs : Liu Guodong, Auteur ; Sun Dan, Auteur ; Huilin Lu, Auteur Année de publication : 2010 Article en page(s) : pp. 5132–5140 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Fluid  dynamics Résumé : Gas−particle two-phase turbulent flows are numerically studied in a 50 MWe circulating fluidized bed combustor. The dense flow of particles is modeled by the frictional stress models adopted from solid mechanics theory, and the dilute flow in the so-called rapid granular flow regime is modeled from the kinetic theory of granular flow. At low concentrations the viscosity due to the effect of the presence of particles is modeled by means of a semiempirical viscosity for fluidized catalytic cracking particles. The distribution of the velocity and concentration of particles in a circulating fluidized bed combustor is predicted. Simulations indicate that the dense regime with a high concentration of particles is in the bottom part and the dilute regime with a low concentration in the upper part of the furnace. The effect of secondary air on the flow behavior is analyzed, and the penetration length of the secondary air jet is computed in a 50 MWe circulating fluidized bed combustor. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901103t [article] Computations of fluid dynamics of a 50 MWe circulating fluidized bed combustor [texte imprimé] / Liu Guodong, Auteur ; Sun Dan, Auteur ; Huilin Lu, Auteur . - 2010 . - pp. 5132–5140. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 11 (Juin 2010) . - pp. 5132–5140 Mots-clés : Fluid  dynamics Résumé : Gas−particle two-phase turbulent flows are numerically studied in a 50 MWe circulating fluidized bed combustor. The dense flow of particles is modeled by the frictional stress models adopted from solid mechanics theory, and the dilute flow in the so-called rapid granular flow regime is modeled from the kinetic theory of granular flow. At low concentrations the viscosity due to the effect of the presence of particles is modeled by means of a semiempirical viscosity for fluidized catalytic cracking particles. The distribution of the velocity and concentration of particles in a circulating fluidized bed combustor is predicted. Simulations indicate that the dense regime with a high concentration of particles is in the bottom part and the dilute regime with a low concentration in the upper part of the furnace. The effect of secondary air on the flow behavior is analyzed, and the penetration length of the secondary air jet is computed in a 50 MWe circulating fluidized bed combustor. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901103t

Numerical simulation of fluid dyanmics of a riser / Zhenhua Hao in Industrial & engineering chemistry research, Vol. 49 N° 8 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3585–3596 Titre : Numerical simulation of fluid dyanmics of a riser : influence of particle rotation Type de document : texte imprimé Auteurs : Zhenhua Hao, Auteur ; Shuai Wang, Auteur ; Huilin Lu, Auteur Année de publication : 2010 Article en page(s) : pp. 3585–3596 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Numerical  Simulation  Fluid  Dynamics  Particle  Rotation Résumé : Flow behavior of gas and particles in a 2-D riser is simulated using a gas−solid two-fluid model with consideration of the effect of particle rotation. The particle−particle interactions are simulated from the kinetic theory for flow of dense, slightly inelastic, slightly rough spheres proposed by Lun (Lun, C. K. K. Kinetic theory for granular flow of dense, slightly inelastic, slightly rough sphere. J. Fluid Mech. 1991, 233, 539−559). Inelastic binary collisions of particles with normal and tangential restitution coefficients are considered. The modified expressions for energy dissipation and viscosities of particles are proposed as a function of tangential and normal restitution coefficients of particles. The present model is evaluated by the measured solids concentration and velocities of Miller and Gidaspow (Miller, A.; Gidaspow. D. Dense, vertical gas-solid flow in a pipe. AIChE J. 1992, 38, 1801−1815), and the measured solids concentration, mass flux, and pressure drop of Knowlton et al. (Knowlton, T.; Geldart, D.; Matsen, J.; King, D. Comparison of CFB hydrodynamic models. PSRI challenge problem. Presented at the Eighth International Fluidization Conference, Tours, France, May 1995) in the risers. Computed profiles of particles are in agreement with the experimental measurements. The simulated energy dissipation, granular temperature, viscosity, and thermal conductivity of particles exhibit nonmonotonic tangential restitution coefficient dependences due to the energy losses resulting from particle collisions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9019243 [article] Numerical simulation of fluid dyanmics of a riser : influence of particle rotation [texte imprimé] / Zhenhua Hao, Auteur ; Shuai Wang, Auteur ; Huilin Lu, Auteur . - 2010 . - pp. 3585–3596. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 8 (Avril 2010) . - pp. 3585–3596 Mots-clés : Numerical  Simulation  Fluid  Dynamics  Particle  Rotation Résumé : Flow behavior of gas and particles in a 2-D riser is simulated using a gas−solid two-fluid model with consideration of the effect of particle rotation. The particle−particle interactions are simulated from the kinetic theory for flow of dense, slightly inelastic, slightly rough spheres proposed by Lun (Lun, C. K. K. Kinetic theory for granular flow of dense, slightly inelastic, slightly rough sphere. J. Fluid Mech. 1991, 233, 539−559). Inelastic binary collisions of particles with normal and tangential restitution coefficients are considered. The modified expressions for energy dissipation and viscosities of particles are proposed as a function of tangential and normal restitution coefficients of particles. The present model is evaluated by the measured solids concentration and velocities of Miller and Gidaspow (Miller, A.; Gidaspow. D. Dense, vertical gas-solid flow in a pipe. AIChE J. 1992, 38, 1801−1815), and the measured solids concentration, mass flux, and pressure drop of Knowlton et al. (Knowlton, T.; Geldart, D.; Matsen, J.; King, D. Comparison of CFB hydrodynamic models. PSRI challenge problem. Presented at the Eighth International Fluidization Conference, Tours, France, May 1995) in the risers. Computed profiles of particles are in agreement with the experimental measurements. The simulated energy dissipation, granular temperature, viscosity, and thermal conductivity of particles exhibit nonmonotonic tangential restitution coefficient dependences due to the energy losses resulting from particle collisions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9019243

Prediction of radial distribution function of particles in a gas-solid fluidized bed using discrete hard-sphere model / Shuyan Wang 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. 1343–1352 Titre : Prediction of radial distribution function of particles in a gas-solid fluidized bed using discrete hard-sphere model Type de document : texte imprimé Auteurs : Shuyan Wang, Auteur ; Liu Guodong, Auteur ; Huilin Lu, Auteur Année de publication : 2009 Article en page(s) : p. 1343–1352 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Gas-Solid  kinetic  theory Résumé : Flow behavior of particles in a two-dimensional bubbling fluidized bed is predicted by using discrete hard-sphere model for particle−particle collision. Quantities of radial distribution functions of monosized particles, binary-sized particles, and binary density particles are obtained. Experimentally or theoretically proposed formulations for the radial distribution functions are evaluated based on our numerically predicted results. For monosized particles, the simulated radial distribution functions are in agreement with computed results from both Bagnold equation (1954) and Ma and Ahmadi (1986) equation. For the binary mixture with the different diameters but identical density, the pair radial distribution functions proposed by Boublik (1970) and Mansoori et al. (1971) agree with simulated data. For binary mixture of different densities, a modified equation of the pair radial distribution function is proposed to correlate from our simulation results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8007049 [article] Prediction of radial distribution function of particles in a gas-solid fluidized bed using discrete hard-sphere model [texte imprimé] / Shuyan Wang, Auteur ; Liu Guodong, Auteur ; Huilin Lu, Auteur . - 2009 . - p. 1343–1352. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1343–1352 Mots-clés : Gas-Solid  kinetic  theory Résumé : Flow behavior of particles in a two-dimensional bubbling fluidized bed is predicted by using discrete hard-sphere model for particle−particle collision. Quantities of radial distribution functions of monosized particles, binary-sized particles, and binary density particles are obtained. Experimentally or theoretically proposed formulations for the radial distribution functions are evaluated based on our numerically predicted results. For monosized particles, the simulated radial distribution functions are in agreement with computed results from both Bagnold equation (1954) and Ma and Ahmadi (1986) equation. For the binary mixture with the different diameters but identical density, the pair radial distribution functions proposed by Boublik (1970) and Mansoori et al. (1971) agree with simulated data. For binary mixture of different densities, a modified equation of the pair radial distribution function is proposed to correlate from our simulation results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8007049

Simulation of performance of cracking reactions of particle clusters in fcc risers / Shuyan Wang 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. 4632-4640 Titre : Simulation of performance of cracking reactions of particle clusters in fcc risers Type de document : texte imprimé Auteurs : Shuyan Wang, Auteur ; He Yurong, Auteur ; Huilin Lu, Auteur ; Jianmian Ding, Auteur Année de publication : 2008 Article en page(s) : p. 4632-4640 Note générale : Bibliogr. p. 4639-4640 Langues : Anglais (eng) Mots-clés : Fluid  catalytic  cracking  riser;  Four-lump  mathematical  model;  Cluster Résumé : The behavior of catalytic cracking reactions of particle cluster in fluid catalytic cracking risers was numerically analyzed using a four-lump mathematical model. The effects of the cluster porosity, inlet gas velocity, and cluster formation on cracking reactions were investigated. Distributions of temperature, gases, and gasoline from both the catalyst particle cluster and an isolated catalyst particle are presented. Simulated results show that the reactions from vacuum gas oil (VGO) to gasoline, gas, and coke of individual particle in the cluster are slower than those of the isolated particle, but faster for the reaction from gasoline to gas and coke. Particle clustering will reduce the reaction rates from VGO to gasoline, gas, and coke and increase the reaction rates from gasoline to gas and coke. Less gasoline is produced by particle clustering. More gas and gasoline are produced for the downward moving cluster than for the upward moving cluster. The cluster formation decreases the reaction rates and reduces gas and gasoline production. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071305q [article] Simulation of performance of cracking reactions of particle clusters in fcc risers [texte imprimé] / Shuyan Wang, Auteur ; He Yurong, Auteur ; Huilin Lu, Auteur ; Jianmian Ding, Auteur . - 2008 . - p. 4632-4640. Bibliogr. p. 4639-4640 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4632-4640 Mots-clés : Fluid  catalytic  cracking  riser;  Four-lump  mathematical  model;  Cluster Résumé : The behavior of catalytic cracking reactions of particle cluster in fluid catalytic cracking risers was numerically analyzed using a four-lump mathematical model. The effects of the cluster porosity, inlet gas velocity, and cluster formation on cracking reactions were investigated. Distributions of temperature, gases, and gasoline from both the catalyst particle cluster and an isolated catalyst particle are presented. Simulated results show that the reactions from vacuum gas oil (VGO) to gasoline, gas, and coke of individual particle in the cluster are slower than those of the isolated particle, but faster for the reaction from gasoline to gas and coke. Particle clustering will reduce the reaction rates from VGO to gasoline, gas, and coke and increase the reaction rates from gasoline to gas and coke. Less gasoline is produced by particle clustering. More gas and gasoline are produced for the downward moving cluster than for the upward moving cluster. The cluster formation decreases the reaction rates and reduces gas and gasoline production. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071305q