Investigations on hydrodynamics of radial flow moving bed reactors

Song, Xuqi; Wang, Zhanwen; Ye, Jin; Gong, M Q

doi:10.1002/ceat.270160605

Cited by 18 publications

(49 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From Figure 3 there is no obvious difference between the cases using the grid sizes of 16 mm and 14 mm. In addition, the fine mesh (16 mm and 14 mm) cases capture more real static pressure in this reactor than the coarse mesh (18,20,22, and 25 mm) cases. Moreover, cases using the grid sizes of 16 mm and 14 mm obtain similar static pressure in the annular channel.…”

Section: Grid Independency and Model Verificationmentioning

confidence: 95%

“…To confirm that the CFD results are independent of the grid size, simulations of the CP-Z flow configuration with mesh sizes of 25,22,20,18,16, and 14 mm are performed at the cold model conditions (see Table S10). Since static pressure is an important parameter in a reactor, its distributions along the annular channel are used to monitor numerical errors, as shown in Figure 3.…”

Section: Grid Independency and Model Verificationmentioning

confidence: 98%

See 1 more Smart Citation

Numerical evaluation and improvement efficiency of radial flow moving‐bed reactors for catalytic pyrolysis of light hydrocarbons to low carbon olefins

2015

View full text Add to dashboard Cite

A three-dimensional (3D) reactor model based on the Eulerian-Eulerian approach was applied to describe the gas-solid flow and heat transfer performance in a radial flow moving bed reactor (RFMBR). A six-lumped kinetic model for the catalytic pyrolysis of C 4 hydrocarbon was employed. The heat transfer characteristics and species concentration profiles were investigated in the reactor under various reaction conditions. Effects of operation parameters and reactor structures on the reactor performance were also evaluated and optimized numerically. Simulation results show that there exists a good heat transfer performance between gas and solid phases in the catalyst bed. The temperature profiles and the species yield distributions are different with respect to bed height positions. Moreover, the results indicate that product yield is more sensitive to the reaction temperature than to the dilution rate and the reaction residence time. For the Z-type centripetal flow RFMBR, an annular tube with an inverted cone structure is helpful to improve the uniformity of flow distribution and increase low-carbon olefins yields.

show abstract

Section: Grid Independency and Model Verificationmentioning

confidence: 95%

Section: Grid Independency and Model Verificationmentioning

confidence: 98%

Numerical evaluation and improvement efficiency of radial flow moving‐bed reactors for catalytic pyrolysis of light hydrocarbons to low carbon olefins

2015

View full text Add to dashboard Cite

show abstract

“…The results demonstrated that the cavity initiation and pinning depend on the shape and the size of particles in their work [13]. Song et al [10,14] also experimentally studied the effect of the gas flow rate on the pinning phenomenon in RFMBRs. They found that the gas flow rate is the key factor for the formation of pinning and cavity.…”

Section: Introductionmentioning

confidence: 96%

“…At this moment, a cavity appears between the catalyst bed and the upstream perforated wall. Since the cavity forms in the catalyst bed, the axial distribution of gas phase becomes non-uniform or the most part of gas even flow through the cavity directly [9,10]. Moreover, some unfavorable operating factors and bad configuration in RFMBRs may lead to the inhomogeneous flow and the formations of pinning and cavity [9].…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of the cavity phenomenon and its elimination way in rectangular radial moving bed reactor

Xiao

Luo

2015

Powder Technology

View full text Add to dashboard Cite

“…Radial flow moving-bed reactors (RFMBRs) have been applied in a number of gas-solid contacting operations including chemical reaction, mass transfer and separation processes [1,2]. In this type of reactor, the catalyst bed moves downward under gravity in a channel between two coaxial cylinders, and the gaseous reactant mixture flows radially across the bed.…”

Section: Introductionmentioning

confidence: 99%

A Two-Phase CFD Modeling Approach to Investigate the Flow Characteristics in Radial Flow Moving-Bed Reactors

Xiao

Luo²

2014

International Journal of Chemical Reactor Engineering

View full text Add to dashboard Cite

Based on a complete CFD Eulerian-Eulerian two-fluid approach, a comprehensive three-dimensional (3D) two-phase reactor model was suggested to describe the flow behavior in radial flow moving-bed reactors (RFMBRs). A porous media model was incorporated into the reactor model in order to describe the flow resistance provided by the porous walls of the center and annular pipes. Compared with these previous reactor models, the reactor model considers the solid-phase movement instead of immobilization, which benefits for predicting the formation of cavity practically. The simulation results are agreement with the published experimental data. By employing the verified model, the flow field parameters in the reactors such as pressure drop and flow velocity were obtained. Besides, the simulations were then carried out to investigate the effect of the bed voidage on the flow behavior and to understand the phenomenon of cavity in the RFMBRs. The simulation results showed that both the centripetal and the centrifugal flow configurations have the inhomogeneous flow distribution and the phenomenon of cavity. Furthermore, the inhomogeneous distribution increases with the increase of the bed voidage, whereas the phenomenon of cavity is more obvious with the increase of gas inlet velocity. As a whole, this work provided a realistic modeling and a useful approach for the understanding of RFMBRs.

show abstract

Investigations on hydrodynamics of radial flow moving bed reactors

Cited by 18 publications

References 1 publication

Numerical evaluation and improvement efficiency of radial flow moving‐bed reactors for catalytic pyrolysis of light hydrocarbons to low carbon olefins

Numerical evaluation and improvement efficiency of radial flow moving‐bed reactors for catalytic pyrolysis of light hydrocarbons to low carbon olefins

Numerical modeling of the cavity phenomenon and its elimination way in rectangular radial moving bed reactor

A Two-Phase CFD Modeling Approach to Investigate the Flow Characteristics in Radial Flow Moving-Bed Reactors

Contact Info

Product

Resources

About