Oxygen Transfer in a Three-Phase Circulating Fluidized Bed with Viscous Liquid Medium

Son, Sung Mo; Kang, Suk Hwan; Kim, Uk Yeong; Shin, Ik Sang; Kang, Yong; Kim, Sang Done

doi:10.1252/jcej.07we119

Cited by 6 publications

(15 citation statements)

References 21 publications

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“…(1) to the concentration profile in the riser (Yang et al, 1999Son et al, 2007Son et al, , 2008b. The value of k L a increases with increasing U G in all the cases studied, as can be seen in Figure 8.…”

Section: Figmentioning

confidence: 57%

“…The volumetric oxygen transfer coefficient, k L a, was estimated by fitting the analytic solution of Eq. (1) to the concentration profiles of dissolved oxygen in the axial direction of the column (Deckwer et al, 1983;Schumpe et al, 1989;Kang et al, 1991;Son et al, 2008b). The error bound for the determination of k L a value was within the range of 3-5%.…”

Section: Methodsmentioning

confidence: 77%

“…Although the three-phase circulating fluidized bed can overcome the disadvantages of conventional three-phase beds, the gas holdup and gas-liquid mass transfer coefficient in the bed could not be a favorable level, since the residence time of dispersed gas phase would decrease considerably owing to the relative high level of liquid velocity (Yang et al, 1999Kim et al, 2001;Wang et al, 2001;Son et al, 2007Son et al, , 2008b. The formation of swirling flow of gas-liquid mixture in the riser can be one of the promise schemes to increase the residence time of bubbles by increasing the travel path in the bed.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of Gas Holdup and Oxygen Transfer in Three-Phase Circulating Fluidized-Bed Bioreactors with Swirling Flow

Son

Kim

Shin

et al. 2009

J. Chem. Eng. Japan

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Enhancement of gas holdup and oxygen transfer was investigated in the riser of a three-phase circulating fluidized bed, with a diameter of 0.102 m (ID) and a height of 3.5 m, by means of liquid swirling flow. Effects of gas (0.01-0.07 m/s) and liquid (0.17-0.44 m/s) velocities, fluidized solid particle size (1.0, 1.7, 2.1, 3.0 mm), solid circulation rate (2-8 kg/(m 2 s)) and swirling liquid ratio (0-0.5) on the gas holdup and volumetric oxygen transfer coefficient in the riser were examined. The gas holdup and oxygen transfer coefficient could be increased up to 25-30% and 20-25% respectively, by means of liquid swirling flow in the riser. The values of gas holdup and volumetric oxygen transfer coefficients were well correlated in terms of dimensionless groups as well as operation variables within these experimental conditions.

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Section: Figmentioning

confidence: 57%

Section: Methodsmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

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Enhancement of Gas Holdup and Oxygen Transfer in Three-Phase Circulating Fluidized-Bed Bioreactors with Swirling Flow

Son

Kim

Shin

et al. 2009

J. Chem. Eng. Japan

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“…The solid circulation rate (G S ), which was measured at least three times, was determined by measuring the amounts of particles piled up above the butterfly valve in the solid recycle device [10][11][12][13][14][15] in a given steady state condition. The measured values of G S agreed well with each other within 3~4% deviations.…”

Section: Methodsmentioning

confidence: 99%

Effects of Operating Variables on the Solid Circulation Rate in a Three-phase Circulating Fluidized Bed

Kim¹,

Hong²,

Lím³

et al. 2015

Korean Chemical Engineering Research

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− Effects of operating variables on the solid circulation rate were investigated in a three-phase circulating fluidized bed, of which inside diameter was 0.102m and height was 3.5m, respectively. Gas velocity, primary and secondary liquid velocities, particle size and height of solid particles piled up in the solid recycle device were chosen as operating variables. The solid circulation rate increased with increasing primary and secondary liquid velocities and height of solid particles piled up in the solid recycle device, but decreased with increasing particle size. The value of solid circulation rate decreased only slightly with increasing gas velocity in the riser. The values of solid circulation rate were well correlated in terms of dimensionless groups within the experimental conditions.

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“…The increasing trend of h TP with U G , d P or G S could be due to the increase in the turbulence in the region adjacent to the heater surface and bed proper in the riser (Cho et al, 2001a;Kang et al, 2007;Lim et al, 2011;Mo et al, 2015), as shown in Figure 10. Son et al (2008b) examined the effects of μ L on the value of h TP . They considered the μ L in the range of 0.96-38.0×10 −3 Pa·s and reported that the value of h TP increased with increasing U G , U L , d P and G S in the riser with viscous liquid media, while it would decrease with increasing μ L .…”

Section: Three-phase Circulating Uidized Beds (Tpcfb)mentioning

confidence: 99%

Characteristics of Three-Phase (Gas–Liquid–Solid) Circulating Fluidized Beds

Kang

Kim²,

Yang

et al. 2018

J. Chem. Eng. Japan / JCEJ

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The characteristics of three-phase (gas-liquid-solid) circulating uidized beds (TPCFBs) are discussed in order to visualize the unique features and advantages thereof due to the intrinsic ow and contacting behaviors of multi-phases, providing a better understanding of the state of art of TPCFBs and their feasible applications as multi-phase reactors and contactors. The hydrodynamics such as individual phase holdups, bubbling ow behaviors, bubble properties and liquid phase dispersions, and heat and mass transfer characteristics in the riser were examined based on the previous investigations. (k L a), gas-liquid interfacial area (a) and liquid side mass transfer coe cient (k L ) were determined. The information on the heat and mass transfer, however, were extremely limited comparing with those of hydrodynamics. Some correlations were suggested to predict the hydrodynamic parameters, and the values of h, k L a, a, and k L in the riser of the TPCFBs to provide insights for the present and future studies. The mechanism of heat and mass transfer and their modeling should be conducted for the better prediction of the performance of the TPCFB-reactors and contactors in the future. Although the information in the riser of various kinds of TPCFBs deviated from each other depending on the solid circulation modes and experimental conditions, they were summarized and consociated for the elucidation of the present states and views of the investigations. Rational guides to predict the hydrodynamics and heat and mass transfer phenomena in the riser of the TPCFB were possible by analyzing and synthesizing the results reported in the literatures presently available. Especially, the e ects of operating variables including gas (U G ) and liquid (U L ) velocities, properties of uidized solid particles and continuous liquid media, and solid circulation rate (Gs) on the hydrodynamic parameters and the heat and mass transfer characteristics such as heat transfer coe cient (h) and resistance, volumetric mass transfer coe cient

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Oxygen Transfer in a Three-Phase Circulating Fluidized Bed with Viscous Liquid Medium

Cited by 6 publications

References 21 publications

Enhancement of Gas Holdup and Oxygen Transfer in Three-Phase Circulating Fluidized-Bed Bioreactors with Swirling Flow

Enhancement of Gas Holdup and Oxygen Transfer in Three-Phase Circulating Fluidized-Bed Bioreactors with Swirling Flow

Effects of Operating Variables on the Solid Circulation Rate in a Three-phase Circulating Fluidized Bed

Characteristics of Three-Phase (Gas–Liquid–Solid) Circulating Fluidized Beds

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