A CFD-PBM coupled model with polymerization kinetics for multizone circulating polymerization reactors

Yan, Wei‐Cheng; Li, Jiang; Luo, Zheng‐Hong

doi:10.1016/j.powtec.2012.07.047

Cited by 39 publications

(27 citation statements)

References 56 publications

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“…Based on the coupled model and the quadrature method of moments, Yan et al considered a single polymer particle growth model and predicted the dynamic evolution of the polymer PSDs. Moreover, Yan et al studied the gas-solid two-phase flow behaviors in a multizone circulating propylene polymerization reactor [30,31]. Recently, Zhu et al…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…For reduction of computational cost, the temperature changes only for heat release of chain propagation reaction and heat transfer between two phases, and the wall of the FBR is assumed to be adiabatic. A simplified polymerization kinetics model is employed in investigating the temperature variations [25,31]. Mainly elementary chain propagation reaction is applied, and the kinetics equation is given as,…”

Section: Polymerization Kineticsmentioning

confidence: 99%

“…When PBM is solved, the moments of PSD can be applied to calculate the Sauter diameter ( ) to modify the interphase force in TFM, and then the information of solid volume fraction, particle velocity and temperature for PBM is updated. Herein, the integrated coupling of CFD model and PBM is implemented, and the correctness and reliability of this method have been widely proved in literatures [25,31,47].…”

Section: Cfd-pbm Coupled Modelmentioning

confidence: 99%

“…It can be used to describe the distribution of a population of particles [31,47], and the total number concentration can be calculated as [60],…”

Section: Effect Of Ethylene Polymerization On the Particle Size Distrmentioning

confidence: 99%

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A CFD-PBM model considering ethylene polymerization for the flow behaviors and particle size distribution of polyethylene in a pilot-plant fluidized bed reactor

et al. 2015

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Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Polymerization Kineticsmentioning

confidence: 99%

Section: Cfd-pbm Coupled Modelmentioning

confidence: 99%

“…It can be used to describe the distribution of a population of particles [31,47], and the total number concentration can be calculated as [60],…”

Section: Effect Of Ethylene Polymerization On the Particle Size Distrmentioning

confidence: 99%

See 2 more Smart Citations

A CFD-PBM model considering ethylene polymerization for the flow behaviors and particle size distribution of polyethylene in a pilot-plant fluidized bed reactor

et al. 2015

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“…In the last 20 years modeling approaches using CFD simulations to describe polymer reactors have overcome this challenge by using either simplified kinetics, as refs. 15–18 and Fox et al,19–21 and/or “user defined function”, as the group of Luo22–24 to take polymerization reaction into account, which is still numerical demanding. On the contrary, axial dispersion models describe hydrodynamics on macro scale with only one or two parameters, but allow for the implementation of complex polymerization kinetics on micro scale.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Polymer Reactors Using the Compartment Modeling Approach

Cremer-Bujara

Biessey

Grünewald

2019

Macro Reaction Engineering

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A compartment modeling approach based on computational fluid dynamics (CFD) simulations is applied to a simplified static mixer geometry. Compartments are derived from velocity fields obtained from cold CFD simulations. This methodology is based on the definition of periodic flow zones (PFZ) derived from the recurrent flow profile within the static mixer. In general, PFZ can be characterized by two different compartments: flow zones with hydrodynamic behavior of a tubular reactor and dead zones exhibiting a more continuous stirred tank reactor‐like characteristic. In CFD studies the influence of changing fluid properties, for example viscosity, on flow profile due to polymerization progress is considered. In the deterministic compartment model, the continuous flow profile within the static mixer is transformed to basic reactor models interconnected via an exchange stream. To reduce model complexity and the number of model parameters, constant volumes of compartments are assumed. Changes in hydrodynamics are considered by a variable exchange flow rate as a function of Re manipulating residence time in compartments. Simulation studies show the influence of decreasing exchange flow rates with polymerization progress, as Re decreases, resulting in a greater increase of viscosity in dead zones. The reactor performance is qualitatively represented by the simulation results.

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A fast modeling of chemical reactions in industrial‐scale olefin polymerization fluidized beds using recurrence CFD

2021

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We present a novel approach for the fast modeling of exothermic chemical reactions in industrial‐scale fluidized bed reactors. It implicates a fast olefin polymerization process, accounting for the catalyst activity, the solubility of the reaction gases in polymer, the particles crystallinity, and the reaction masses and heat transfer. We principally apply the transport‐based recurrence computational fluid dynamics (rCFD) model upon the base of a short‐term non‐reactive simulation performed by a coarse‐grained two‐fluid model (cgTFM). Following the captured recurrent flows, the methodology propagates rapidly passive scalars far beyond the recorded simulation. The reaction kinetics of production/consumption rates due to polymerization are locally embedded into the individual solid/gas species concentrations. These in turn are considered in transporting the enthalpy and the generated heat by reaction. By doing so, the significant computational effort required to couple the thermodynamic effects of polymerization with the cgTFM (hybrid model), is drastically reduced using rCFD with very reliable agreement.

show abstract

A CFD-PBM coupled model with polymerization kinetics for multizone circulating polymerization reactors

Cited by 39 publications

References 56 publications

A CFD-PBM model considering ethylene polymerization for the flow behaviors and particle size distribution of polyethylene in a pilot-plant fluidized bed reactor

A CFD-PBM model considering ethylene polymerization for the flow behaviors and particle size distribution of polyethylene in a pilot-plant fluidized bed reactor

Simulation of Polymer Reactors Using the Compartment Modeling Approach

A fast modeling of chemical reactions in industrial‐scale olefin polymerization fluidized beds using recurrence CFD

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