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

Kim, Min Kon; Hong, Sung Kyu; Lím, D.; Yoo, Dong Jun; Kang, Yong

doi:10.9713/kcer.2015.53.4.440

Cited by 2 publications

(2 citation statements)

References 19 publications

(25 reference statements)

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“…The steady-state Gs is 0.66, 0.615, and 0.46 kg (m 2 s) −1 , respectively. As the d p increases, the ratio of U lc to U t gradually increases, but the corresponding stable G S decreases, which is consistent with the conclusion obtained by Kang et al 16,43 on macroscopic three-phase circulating fluidized beds. The delayed transition is attributed to the strengthened wall effect caused by an increase in d p , which has also been discovered in related studies on liquid− solid microcirculating fluidized beds.…”

Section: Effect Of Particlesupporting

confidence: 91%

Multibubble Behavior and Solid Circulation Rate in a Gas–Liquid–Solid Circulating Microfluidized Bed

Guo,

Ma,

Liu

et al. 2023

Ind. Eng. Chem. Res.

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Comprehensively understanding the hydrodynamics of microfluidized beds is advantageous for guiding their application in chemical and related process industries. This paper investigated the flow regime transition, multibubble behavior, and solid circulation rate of a three-phase circulating microfluidized bed with an inner diameter of 0.8 mm. Experimental results showed that increasing the gas velocity significantly facilitated the transition to the circulating fluidization regime. Transitions between different flow regimes could be delayed by enhanced wall effects. The bubble diameter ranged from 0.1 to 0.5 mm and followed a log-normal distribution. The bubble velocity could be affected by wall effects, particles, bubble coalescence, and bubble spacing. The average bubble velocity was related to the flow regime and decreased in the axial direction. The solid circulation rate, expressed in terms of mass flow rate, was determined using the image mean gray value method in combination with the PIVlab, with a deviation from measurements obtained using traditional methods of less than 10%.

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Section: Effect Of Particlesupporting

confidence: 91%

Multibubble Behavior and Solid Circulation Rate in a Gas–Liquid–Solid Circulating Microfluidized Bed

Guo,

Ma,

Liu

et al. 2023

Ind. Eng. Chem. Res.

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“…Considering the effects of operating variables on ε S , it was found that the value ε S increased with increasing U G , d P or G S but decreased with increasing U L or μ L in TPCFBs as shown in Figures 3 and 4 (Cho et al, 2001a;Liu et al, 2003;Vatanakull et al, 2003;Razzak et al, 2007Razzak et al, , 2009). Regarding the G S in TPCFBs, Kim et al (2015) suggested Eq.…”

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

confidence: 99%

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

Kang

Kim²,

Yang

et al. 2018

Journal of Chemical Engineering of Japan

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

Cited by 2 publications

References 19 publications

Multibubble Behavior and Solid Circulation Rate in a Gas–Liquid–Solid Circulating Microfluidized Bed

Multibubble Behavior and Solid Circulation Rate in a Gas–Liquid–Solid Circulating Microfluidized Bed

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

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