Reduction of bubble coalescence by louver baffles in fluidized bed gasifier

Phuakpunk, Kiattikhoon; Chalermsinsuwan, Benjapon; Assabumrungrat, Suttichai

doi:10.1016/j.egyr.2022.06.098

Cited by 4 publications

(8 citation statements)

References 36 publications

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“…For instance, Ege and Zhang et al reported that inserting internal baffles can greatly reduce the bubble size. Some research studies have applied Computational Fluid Dynamic (CFD) techniques to examine the effect of baffles on bubble behavior in bubbling fluidized beds. , Further study is recommended on the design details for internal inserts.…”

Section: Mathematical Modelmentioning

confidence: 99%

See 1 more Smart Citation

Kinetics, Mass Transfer, and Reactor Scaling Up in Production of Direct Dimethyl Ether

Pathoumthong

Ratanamalaya

Limtrakul

et al. 2022

Ind. Eng. Chem. Res.

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A two-phase model was developed for scaling up bubbling fluidized bed reactors for dimethyl ether production. Kinetic model correlations for the reactions were developed from fixed-bed experimental data. In addition, the mass transfer coefficient between the bubble and emulsion phases in a bubbling fluidized bed was estimated from experimental data, and the Sherwood number correlation was reported. Finally, scaling up of a bubbling fluidized bed reactor from laboratory to industrial scale was carried out using three similarity criteria: hydrodynamic, residence time, and performance. The hydrodynamic similarity criterion was shown to be inadequate due to low mass transfer and residence time on a large scale. The criteria of similarities in performance and residence time provide the same dimethyl ether yield in all scales. The two-phase models, combined with correlations developed for kinetic and mass transfer parameters, are useful for analysis of laboratory and industrial-scale reactors, and provide information on scaling up.

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Section: Mathematical Modelmentioning

confidence: 99%

“…Some research studies have applied Computational Fluid Dynamic (CFD) techniques to examine the effect of baffles on bubble behavior in bubbling fluidized beds. 59,60 Further study is recommended on the design details for internal inserts.…”

Section: Model 3 For Scaling Up Based On Performance Similarity With ...mentioning

confidence: 99%

Kinetics, Mass Transfer, and Reactor Scaling Up in Production of Direct Dimethyl Ether

Pathoumthong

Ratanamalaya

Limtrakul

et al. 2022

Ind. Eng. Chem. Res.

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“…Hence, studying solid particle behavior is a critical step in improving FBC reactors. Numerous researchers have delved into this topic, focusing on enhancing mixing and segregation behavior [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. One approach has been the development of multi-stage fluidized bed reactors.…”

Section: Introductionmentioning

confidence: 99%

“…Notably, the study underscored the pivotal role of proper baffle design, with the single-turn Louvre baffle exhibiting optimal performance for reactor enhancement. Furthermore, Phuakpunk et al [13] delved into the impact of bubble coalescence in bubbling bed gasifiers and the potential use of louver baffles to mitigate this effect. Their computational fluid dynamics (CFD) simulations elucidated the significant role of baffle configuration in reducing bubble size and enhancing gas-solid contact, thereby bolstering gasifier performance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Inserting Baffles on the Solid Particle Segregation Behavior in Fluidized Bed Reactor: A Computational Study

Kreesaeng,

Chalermsinsuwan,

Piumsomboon

2024

ChemEngineering

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In multi-solid, particle-size fluidized bed reactor systems, segregation is commonly observed. When segregation occurred, small solid particles were entrained to the top of the bed and escaped from the reactor. During the combustion process, the small solid particles that escaped from the boiler were burned and subjected to damage around the cyclone separator. This study then employed a computational fluid dynamics approach to investigate solid particle behavior in the reactor using three different sizes of solid particles. The effects of baffle insertion, baffle angle, stage number, and its arrangement were examined. The percentage of segregation was calculated to compare behavior among different reactor systems. The insertion of 45-degree baffles resulted in reduced segregation behavior compared to cases without baffles and with 90-degree baffles, attributed to solid hindering and collision phenomena. Additionally, a double-stage baffle with any arrangement could reduce segregation behavior. The best arrangement was “above-arrangement” due to particles hindering, swirling, and accumulating between the baffle stages. Therefore, to diminish segregation behavior and enhance combustion chemical reactions, the insertion of baffles in the reactor zone is recommended.

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“…These are various perforated plates, baffles, louver baffles, etc. [54][55][56][57][58][59][60]. Distribution devices make it possible to structure the bed, to get rid of the formation of particularly large bubbles that negatively affect the process, and to further intensify mixing [54][55][56][57][58][59][60].…”

mentioning

confidence: 99%

Numerical Simulation of Hydrodynamics and Heat Transfer in a Reactor with a Fluidized Bed of Catalyst Particles in a Three-Dimensional Formulation

Ulitin,

Tereshchenko,

Rodionov

et al. 2024

Applied Sciences

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The hydrodynamics and heat transfer in a reactor with a fluidized bed of catalyst particles and an inert material were simulated. The particle bed (the particle density was 2350 kg/m3, and the particle diameter was 1.5 to 4 mm) was located in a distribution device which was a grid of 90 × 90 × 60 mm vertical baffles. The behavior of the liquefying medium (air) was modeled using a realizable k-ε turbulence model. The behavior of particles was modeled using the discrete element method (DEM). In order to reduce the slugging effect, the particles were divided into four separate horizontal layers. It was determined that with the velocity of the liquefying medium close to the minimum fluidization velocity (1 m/s), slugging fluidization is observed. At a velocity of the liquefying medium of 3 m/s, turbulent fluidization in the lowest particle layer and bubbling fluidization on subsequent particle layers are observed. With an increase in the velocity of the liquefying medium over 3 m/s, entrainment of particles is observed. It was shown that a decrease in the density of the liquefying medium from 1.205 kg/m3 to 0.383 kg/m3 when it is heated from 298 K to 923 K would not significantly affect the hydraulic resistance of the bed. Based on the obtained results, it can be stated that the obtained model is optimal for such problems and is suitable for the further description of experimental data.

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Reduction of bubble coalescence by louver baffles in fluidized bed gasifier

Cited by 4 publications

References 36 publications

Kinetics, Mass Transfer, and Reactor Scaling Up in Production of Direct Dimethyl Ether

Kinetics, Mass Transfer, and Reactor Scaling Up in Production of Direct Dimethyl Ether

Effect of Inserting Baffles on the Solid Particle Segregation Behavior in Fluidized Bed Reactor: A Computational Study

Numerical Simulation of Hydrodynamics and Heat Transfer in a Reactor with a Fluidized Bed of Catalyst Particles in a Three-Dimensional Formulation

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