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Full-Text Articles in Chemical Engineering
Experimental And Computational Studies Of Gas Mixing In Conical Spouted Beds, Zhiguo Wang, C. Jim Lim, Xiaotao T. Bi
Experimental And Computational Studies Of Gas Mixing In Conical Spouted Beds, Zhiguo Wang, C. Jim Lim, Xiaotao T. Bi
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
The residence time distribution data in a conical spouted bed, obtained both from the bed bottom and the bed surface at different radial positions, were analyzed to obtain the mean residence time and the Peclet number. In parallel, local flow structures of a bed with the same dimensions and operating conditions as in the experiment were generated from the computational fluid dynamics (CFD) simulation using the FLUENT codes, and then were used for the simulation of gas dispersion. The results show that CFD simulations agree reasonably well with experiments. The radial distribution of the Peclet number is quite complex, with …
Scaling Relationships Of Gas-Solid Spouted Beds , Jian Xu, Ye Ji, Weisheng Wei, Xiaojun Bao, Wei Du
Scaling Relationships Of Gas-Solid Spouted Beds , Jian Xu, Ye Ji, Weisheng Wei, Xiaojun Bao, Wei Du
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
An additional parameter, the particle-particle coefficient of restitution was added to the scaling relationship of spouted beds proposed by He et al. (4) by granular kinetic theory analysis of the particle movements in both spout and annulus regions. The experimental verification was conducted in two spouted beds with 80 and 120 mm ID. It has been found that good similarity could not be obtained when the coefficients of restitution were not matched.
Cold Modelling Of An Internally Circulating Fluidized Bed Membrane Reactor, Tony Boyd, John R. Grace, C. Jim Lim, A. M. Adris
Cold Modelling Of An Internally Circulating Fluidized Bed Membrane Reactor, Tony Boyd, John R. Grace, C. Jim Lim, A. M. Adris
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
A novel fluidized bed membrane reactor with internal catalyst circulation is being developed for the production of high-purity H2 from an autothermal reformer. In order to provide guidance to pilot reactor testing, a cold model was built to study the influence of reactor configuration on hydrodynamics and catalyst circulation. It was found that catalyst circulation was reproducible, but that parallel non-communicating flow channels could lead to flow instability. Solids circulation was found to be adequate for design of the autothermal reformer.
Numerical Simulation Of Spouted Bed Reactors Using Process Engineering Models: Application To Coal Gasification, Alexandra Mendes, Alain Dollet, Carine Ablitzer, Gilles Flamant, Christophe Perrais
Numerical Simulation Of Spouted Bed Reactors Using Process Engineering Models: Application To Coal Gasification, Alexandra Mendes, Alain Dollet, Carine Ablitzer, Gilles Flamant, Christophe Perrais
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
A spouted bed reactor operating at high temperature has been modelled using one dimensional models based on process engineering concepts. The process of coal gasification has been selected to demonstrate the models achievements and predictions have been compared to previous spouted bed reactor experimental results.
Hydrodynamic Aspects And Correlations For The Design Of Draft-Tube Conical Spouted Beds, H. Altzibar, S. Alvarez, M.J. San José, R. Aguado, J. Bilbao, Martin Olazar
Hydrodynamic Aspects And Correlations For The Design Of Draft-Tube Conical Spouted Beds, H. Altzibar, S. Alvarez, M.J. San José, R. Aguado, J. Bilbao, Martin Olazar
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
A study has been carried out on the hydrodynamics of conical spouted beds with draft tube. Correlations have been proposed for calculating minimum spouting velocity, operating pressure drop and peak pressure drop as functions of dimensionless module that take into account geometric factors, particle characteristics and operating conditions.
Simulation Of A Silicon Cvd Spouted Fluidized Bed Reactor: Semi-Batch Operations, Juliana Piña, Verónica Bucalá, Susana N. Schbib, Paul Ege, Hugo Ignacio De Lasa
Simulation Of A Silicon Cvd Spouted Fluidized Bed Reactor: Semi-Batch Operations, Juliana Piña, Verónica Bucalá, Susana N. Schbib, Paul Ege, Hugo Ignacio De Lasa
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
A comprehensive multiphase gas-solid mathematical model that successfully describes the batch growth of silicon particles in a chemical vapor deposition (CVD) submerged spouted bed reactor is extended to simulate semi-batch operations with periodic seeds additions and product extractions. This model takes into account the fluidized bed reactor as well as a population balance equation representing particle growth and agglomeration. Experimental data obtained from semi-batch operation in a pilot scale reactor at REC Silicon Inc. are used to evaluate the proposed mathematical model.
A Rotating Fluidized Bed In A Static Geometry: Experimental Proof Of Concept, Juray De Wilde, Luc Wautier, Guy B. Marin, Geraldine J. Heynderickx, Axel De Broqueville
A Rotating Fluidized Bed In A Static Geometry: Experimental Proof Of Concept, Juray De Wilde, Luc Wautier, Guy B. Marin, Geraldine J. Heynderickx, Axel De Broqueville
The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
The new concept of a rotating fluidized bed in a static geometry (RFB-SG) is presented (1). The rotating motion of the particle bed and the tangential fluidization of the solids are obtained by the tangential injection of the fluidization gas via multiple gas inlet slots in the outer cylindrical wall of the fluidization chamber. The new fluidization concept is experimentally investigated and proven using either large diameter, low density polymer particles or small diameter, higher density Alumina particles.