Effect of a new high porosity packing on hydrodynamics of bubble columns

Moustiri, S; Hébrard, Gilles; Roustan, M.

doi:10.1016/s0255-2701(01)00162-3

Cited by 16 publications

(10 citation statements)

References 5 publications

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“…Another approach is to introduce a solid phase into the bubble column. Various works have applied packed beds in their bubble columns, achieving both positive and negative effects on bubble hydrodynamics and mass transfer .…”

Section: Introductionmentioning

confidence: 99%

Gas Sparger Orifice Sizes and Solid Particle Characteristics in a Bubble Column – Relative Effect on Hydrodynamics and Mass Transfer

et al. 2017

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The relative effects of the size of gas sparger orifices and properties of solid particles on gas-liquid mass transfer are not yet fully understood. Here, the impact of sparger orifice sizes, solid particle shapes, and their loading amounts in a bubble column reactor on the absorption of oxygen in tap water was investigated. Their influence on the mass transfer coefficient and bubble hydrodynamic parameters was evaluated. The results show that the addition of solid particles can have both positive and negative effects on hydrodynamics and mass transfer, depending on the orifice size of the gas sparger. The introduction of ring-shaped solid particles can improve the mass transfer rate by up to 28 % without requiring any significant additional power.

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Section: Introductionmentioning

confidence: 99%

Gas Sparger Orifice Sizes and Solid Particle Characteristics in a Bubble Column – Relative Effect on Hydrodynamics and Mass Transfer

et al. 2017

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“…Further, the presence at a high concentration of solid media involves the moving bed capture or obstructs and blocks the bubbles from free rising. This effect especially relates with the ring particles, which had the highest surface area, leading to the highest drag force [10]. Additionally, the low U B directly related to the small bubble.…”

Section: Bubble Rising Velocity (U B )mentioning

confidence: 96%

“…Beside ALR development for improving gas-liquid hydrodynamic characteristics and oxygen mass transfer performance through designing the efficient structures or internal configuration, the addition of a solid phase in gas-liquid reactors has also attracted much attention due to their numerous advantages over conventional reactors, including the excellent contact among the gas-liquid-solid phases which improve mass transfer rates. Recently, different studies have been applied to packed beds and moving solids in their gas-liquid reactor [10][11][12]. However, in-depth investigation of the relationship between particle characteristics and gas-liquid hydrodynamics or/and oxygen mass transfer performance is still required in order to understand the internal mechanism in the reactors as well as to extend the potential application of gas-liquid-solid contactors.…”

Section: Introductionmentioning

confidence: 99%

Relative Effect of Additional Solid Media on Bubble Hydrodynamics in Bubble Column and Airlift Reactors towards Mass Transfer Enhancement

et al. 2020

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Many researchers have focused on multi-phase reactor development for improving mass transfer performance. However, solid particle addition in gas–liquid contactor for better oxygen mass transfer performance is still limited. Hence, this study aims to analyze the relative effect of different types of local solid media on the bubble hydrodynamic characteristics towards mass transfer enhancement in bubble columns (BCR) and airlift reactors (ALR). This was investigated by varying solid media types (ring, sphere, cylinder, and square), solid loadings (0%–15%), and superficial gas velocities (Vg) (2.6–15.3 × 10−3 m/s) in terms of the bubble hydrodynamic and oxygen mass transfer parameters. The result showed that bubble size distribution in BCR and ALR with additional plastic media was smaller than that without media addition, approximately 22%–27% and 5%–29%, respectively, due to the increase of the bubble breaking rate and the decrease of the bubble rising velocity (UB). Further, adding media in both reactors significantly decreased the UB value. Since media increased flow resistance, resulting in decreased liquid velocity, it can also be the moving bed to capture or block the bubbles from free rising. Therefore, oxygen mass transfer performance was investigated. The oxygen transfer coefficient (KLa) in BCR with solid media addition was enhanced up to 31%–56% compared to a non-addition case, while this enhancement was greater at higher solid loading due to its higher effective surface, resulting in a higher bubble break-up rate compared to the lower loading. In ALR, up to 38.5% enhanced KLa coefficient was archived after adding plastic media over the non-addition case. In conclusion, ring and cylinder media were found to be the most significant for improving KLa value in BCR and ALR, respectively, without extra energy.

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“…In addition, Han et al found that novel internals made of several structured porous passages can eliminate excessive pressure drop and flooding in a packed column with conventional gas‐liquid countercurrent flow. Moustiri et al studied the effect of a new high porosity packing (solid fraction corresponds to 0.5%) on the hydrodynamics and found that high porosity packing can maintain a homogeneous regime over a large range of superficial gas velocities. Recently, a laboratory structured packing, Sulzer DX packing, has been considered as promising candidate for improving the absorption performance for CO 2 capture due to its larger surface area, lower number of theoretical stages, lower pressure drop, coarser structure, fewer parts, and easy fabrication.…”

Section: Introductionmentioning

confidence: 99%

Investigation of hydrodynamic performance and effective mass transfer area for Sulzer DX structured packing

et al. 2018

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The hydrodynamic performance in terms of pressure drop (▵P) and liquid holdup (hL), and tshe effective mass transfer area (ae) of Sulzer DX structured packing were investigated at 293.15 K and 101.3 kPa. In addition, the flooding velocity (uF) was also calculated based on the experimental results of liquid holdup, and the effective voidage correction factor (ς) was obtained by combining the Billet model and the experimental effective fraction. The liquid volume method and pressure difference from just below to above the column packing approach are used to describe the hydrodynamic performance in a structured packing column. Experimental results showed that the operational conditions in terms of gas flow rate, liquid flow rate, viscosity, and liquid systems strongly affect the hydrodynamic performance. The experimental comparison between the pressure drop profiles in air‐water (polyethylene oxide [PEO]) and MEA‐H2O‐CO2 systems indicated that both the reacting MEA and CO2 partial pressure can enhance the pressure drop value. In addition, the Bain‐Haugen correlation model was developed to predict the flooding velocity data with an acceptable AARD of 8.1%, and a model was also successfully proposed to predict the values of liquid holdup with an AARD of 11.8%, which is lower than 14.7% in Billet model. Furthermore, the effective mass transfer area was found to be increased by increasing both the liquid and gas flow rate by using NaOH‐H2O‐CO2 system. A model was also proposed to calculate the experimental ae with an acceptable AARD% of 19.52, and this built model (Eq. 39) can reasonably explain the experimental phenomenon. © 2018 American Institute of Chemical Engineers AIChE J, 64: 3625–3637, 2018

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Effect of a new high porosity packing on hydrodynamics of bubble columns

Cited by 16 publications

References 5 publications

Gas Sparger Orifice Sizes and Solid Particle Characteristics in a Bubble Column – Relative Effect on Hydrodynamics and Mass Transfer

Gas Sparger Orifice Sizes and Solid Particle Characteristics in a Bubble Column – Relative Effect on Hydrodynamics and Mass Transfer

Relative Effect of Additional Solid Media on Bubble Hydrodynamics in Bubble Column and Airlift Reactors towards Mass Transfer Enhancement

Investigation of hydrodynamic performance and effective mass transfer area for Sulzer DX structured packing

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