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Particle size distribution in a multi-zone circulating fluidized bed polymerization reactor

Particuology 2024年第10期93卷 291-299页

作者： Mohammadhossein Hadadiyan Navid Mostoufi Reza Marandi Process Design and Simulation Research Centre School of Chemical EngineeringCollege of EngineeringUniversity of TehranP.O.Box 11155-4563TehranIran Polymer Research Group Petrochemical Research and Technology CompanyNational Petrochemical CompanyP.O.Box 14358/84711TehranIran

This research focuses on modeling a multi-zone circulating reactor(MZCR)in the polypropylene production *** these reactors,designed for polyolefin production,small catalyst particles(20–300μm)initiate polymerization in the presence of monomer *** reactor consists of two main regions:the riser and the *** riser operates in the fast fluidization and the downer is in the moving bed *** the two-fluid model with the Eulerian-Eulerian approach,the dynamics of both solid and gas phases were modeled by applying Newton's laws of motion and assuming spherical *** population balance of particles within the reactor was also coupled with the equations of *** simultaneous solution of these equations provides valuable insights into particle and fluid behavior,revealing trends such as the growth of polymer ***,the impact of various operating conditions was *** study also examined the effects of design parameters(gas inlet velocity,average inlet diameter,and temperature)on the system *** instance,it was shown that in the case where the solid circulation flux is 30 kg/(m^(2) s)the velocity of particles in the bed increases from 0.4 at the inlet to 1.1 m/s in the fully developed zone,when it is 43 kg/(m^(2) s)the velocity of particles increases from 0.3 to 1.4 m/s,and when it is 55 kg/(m^(2) s),it is increased from 0.22 to 1.5 m/***,trends in particle size distribution based on temperature adjustments were *** study showed that higher temperatures accelerate the polymerization reaction rate,promoting faster growth kinetics and the formation of larger particles.

关键词： Fluidization Polymerization Gas-solid flow Multi-zone circulating reactor(MZCR) CFD-PBM two-fluidmodel

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Analysis of two-Phase Cavitating Flowwith two-Fluid Model Using Integrated Boltzmann Equations

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Advances in Applied Mathematics and Mechanics 2013年第5期5卷 607-638页

作者： Shuhong Liu Yulin Wu Yu Xu Hua-Shu Dou State Key Laboratory of Hydro Science and Hydraulic Engineering Tsinghua UniversityBeijing 100084China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100080China Faculty of Mechanical Engineering and Automation Zhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina

In the present work,both computational and experimentalmethods are employed to study the two-phase flow occurring in a model pump *** twofluid model of the two-phase flow has been applied to the simulation of the threedimensional cavitating *** governing equations of the two-phase cavitating flow are derived from the kinetic theory based on the Boltzmann *** isotropic RNG k−ε−kca turbulence model of two-phase flows in the form of cavity number instead of the formof cavity phase volume fraction is *** RNG k−ε−kca turbulence model,that is the RNG k−εturbulence model for the liquid phase combined with the kca model for the cavity phase,is employed to close the governing turbulent equations of the two-phase *** computation of the cavitating flow through a model pump sump has been carried out with this model in three-dimensional *** calculated results have been compared with the data of the PIV *** qualitative agreement has been achievedwhich exhibits the reliability of the numerical simulation model.

关键词： Cavitating flow two-fluidmodel RNG k−ε−kca turbulencemodel Boltzmann equations kinetic theory.

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