Characteristics and applications of micro fluidized beds (MFBs)

Qie, Zhipeng; Alhassawi, Hassan; Sun, Fei; Gao, Jihui; Zhao, Guangbo; Fan, Xiaolei

doi:10.1016/j.cej.2021.131330

Cited by 22 publications

(10 citation statements)

References 122 publications

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“…HA − m ρ p HA (7) Differences between theoretical and experimental pressure drop have been observed when changing the bed material. For instance, Vanni et al report a larger difference for glass walls than for stainless steel walls [40].…”

Section: Effect Of Adding Secondary Particlementioning

confidence: 99%

“…On the technology side, Micro Fluidised Bed Reactors (MFBRs) have been proposed as a suitable platform for the evaluation of gas-solid reaction kinetics [6,7], owing to their low-cost, high-throughput testing capacity, low energy consumption, good heat/mass transfer properties, and improved safety (since only small quantities of material are used, leading to reduced handling and disposal). In contrast, larger scale fluidised beds require special operating equipment and training [3,8,9].…”

Section: Introductionmentioning

confidence: 99%

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Fluidisation behaviour and wall effects of cohesive hydrotalcite powder in a micro-fluidised bed

2023

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Section: Effect Of Adding Secondary Particlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluidisation behaviour and wall effects of cohesive hydrotalcite powder in a micro-fluidised bed

2023

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“…Microbeds have small volumes and are usually shallow and contained in narrow reactors. Microfluidized experiments have become increasingly popular because of enhanced heat and mass transfer between solid and gas phases and limited back mixing. , Although the hydrodynamic behavior during fluidization of microbeds differs from beds at medium and large scale, the simplicity of microfluidized experiments explains their popularity in researching reaction kinetics, gasification, catalytic effects, and more. , For example, a multistage in situ reaction analyzer based on a microfluidized bed (MFB-MIRA) was developed and applied to determine the reaction order, n , of char combustion in O 2 . The bed was made of 3–6 g of SiO 2 sand, with a static height of 4–10 mm.…”

Section: New Research Frontiersmentioning

confidence: 99%

“…302,303 Although the hydrodynamic behavior during fluidization of microbeds differs from beds at medium and large scale, the simplicity of microfluidized experiments explains their popularity in researching reaction kinetics, gasification, catalytic effects, and more. 303,304 For example, a multistage in situ reaction analyzer based on a microfluidized bed (MFB-MIRA) was developed and applied to determine the reaction order, n, of char combustion in O 2 . 302 The bed was made of 3−6 g of SiO 2 sand, with a static height of 4−10 mm.…”

Section: New Research Frontiersmentioning

confidence: 99%

Combustion of Biomass in Fluidized Beds: A Review of Key Phenomena and Future Perspectives

Kwong

Marek

2021

Energy Fuels

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This review presents recent advances in research on fluidized bed combustion of solid biomass. While the main focus is on thermochemical processes occurring in fluidized beds, applicable investigations on biomass combustion from other research areas are also described as they often provide fundamental insight about the processing of biomass, applicable also in the context of fluidized beds. This review aims to summarize lessons learned and indicate some remaining gaps in the existing body of knowledge. The review discusses combustion in separate stages, such as drying, pyrolysis, and homo-and heterogeneous combustion, and characterizes how fluidized beds affect combustion, discussing heat and mass transfer, material segregation, and bed agglomeration. Finally, advances in new research trends and the prospects for technology development are considered, highlighting the chemical-looping technology with its inherent potential for carbon capture, scale-up of advanced computational models, and progress in spectroscopic and tomographic studies applied to combustion.

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“…Nowadays, one of the main applications of MFB is for bioprocessing and bioproduction such as wastewater treatment, cell cultivation, fungal fermentation based on the liquid-solid and gas-liquid-solid systems [4]. The multiphase fluidized bed bioreactors present excellent gas/liquid-solid mixing and lower mass transfer limitation compared to the conventional packed bed reactor [34]. More importantly, the liquid-solid/gas-liquidsolid systems can mitigate the cell damage/death due to mechanical stress which is caused by the agitated impellers in stirred-tank bioreactor.…”

Section: Introductionmentioning

confidence: 99%

Design and Investigation of a 3D-Printed Micro-Fluidized Bed

Zhang

Goh

et al. 2021

ChemEngineering

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Micro-fluidized bed has aroused much attention due to its low-cost, intensified-process and fast-screening properties. In this paper, a micro-fluidized bed (15 × 15 mm in cross-section) was designed and fabricated with the use of the stereolithography printing technique, for the investigation of bubbles’ hydrodynamics and comparison of the solids (3D-printed particles VS fungal pellets) fluidization characteristics. In a liquid–gas system, bubble flow regime started from mono-dispersed homogeneous regime, followed by poly-dispersed homogeneous regime, transition bubble regime and heterogeneous bubble regime with increasing gas flowrates from 3.7 mL/min to 32.7 mL/min. The impacts from operating parameters such as gas flowrate, superficial liquid velocity and gas sparger size on bubble size, velocity and volume fraction have been summarized. In liquid–solid fluidization, different solid fluidization regimes for both particles bed and pellets bed were identified. From the bed expansion results, much higher Umf of 7.8 mm/s from pellets fluidization was observed compared that of 2.3 mm/s in particles fluidization, because the hyphal structures of fungal pellets increased surface friction but also tended to agglomerate. The similar R–Z exponent n (5.7 and 5.5 for pellets and particles, respectively) between pellets and particles was explained by the same solid diameter, but much higher Ut of 436 µm/s in particles bed than that of 196 µm/s in pellets bed is a consequence of the higher density of solid particles. This paper gives insights on the development of MFB and its potential in solid processing.

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Characteristics and applications of micro fluidized beds (MFBs)

Cited by 22 publications

References 122 publications

Fluidisation behaviour and wall effects of cohesive hydrotalcite powder in a micro-fluidised bed

Fluidisation behaviour and wall effects of cohesive hydrotalcite powder in a micro-fluidised bed

Combustion of Biomass in Fluidized Beds: A Review of Key Phenomena and Future Perspectives

Design and Investigation of a 3D-Printed Micro-Fluidized Bed

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