SO2 absorption by water droplets.

Kaji, Ryuichi; Hishinuma, Yukio; Kuroda, Hiroshi

doi:10.1252/jcej.18.169

Cited by 36 publications

(23 citation statements)

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“…Data in the literature suggest that the relative velocity of droplets does not have a significant effect on the liquid mass transfer (Altwicker and Lindhjem, 1988;Kaji et al, 1985). In addition, since the velocity of the spray can be as high as 40 ft/s, the gas velocity contributes little to the relative velocity of the drops.…”

Section: Description Of Apparatusmentioning

confidence: 99%

“…Garner and Lane (1959) also reported CO 2 absorption rates much higher than Kronig and Brink predictions for 4220 and 5850 µm drops. Kaji et al (1985) also used SO 2 to study absorption into 2200 µm drops.…”

Section: Turbulent Circulationmentioning

confidence: 99%

“…Little or no data exists for mass transfer during spray impact or sample collection, and methods for sample collection have been crude. In single droplet studies, more care has been taken, and methods include isolating collected droplets from the gas stream with an oil film (Amokrane et al, 1994;Kaji et al, 1985;Taniguchi et al, 1997) and collecting the droplets in NaOH solution so that dissolved CO 2 reacts before it can desorb into the gas (Altwicker and Lindhjem, 1988). …”

Section: Spray Sampler Developmentmentioning

confidence: 99%

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Liquid‐phase mass transfer in spray contactors

Yeh

Rochelle

2003

AIChE Journal

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The liquid‐phase mass transfer in sprays has been measured with carbon dioxide desorption by collecting and analyzing samples of the spray. Experiments were conducted with laboratory‐ (0.009 to 0.13 L/s) and pilot‐scale (6.4 to 12.8 L/s) centrifugal hollow‐cone spray nozzles at pressure drops from 34 kPa to 138 kPa. Significant mass transfer occurred during sample collection, and a quench sampling method was developed to minimize this effect. The number of liquid‐phase transfer units (NL) due to spray impact onto walls and liquid pools was often as much as the spray NL. Approximately 60% of the spray NL occurs in the liquid sheet before droplet formation, and the droplet region can account for less than half of the total NL of the spray.

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Section: Description Of Apparatusmentioning

confidence: 99%

Section: Turbulent Circulationmentioning

confidence: 99%

Section: Spray Sampler Developmentmentioning

confidence: 99%

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Liquid‐phase mass transfer in spray contactors

Yeh

Rochelle

2003

AIChE Journal

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“…Par contre, lorsque la résistance au transfert se situe essentiellement dans la phase liquide, AMOKRANE et al (1994) concluent qu'aucun des principaux modèles ne simule correctement les résultats expérimentaux publiés par ALT- WICKER et LINDHJEM (1988), GARNER et LANE (1959), KAJI et al (1985) et WAL- CEK et al (1984). La plupart de ces modèles, utilisés en Génie Chimique et en Physique de l'Atmosphère, sont basés sur une approche globale des phéno-mènes; ils utilisent comme échelles caractéristiques la vitesse terminale de chute et le diamètre de la goutte.…”

Section: -Introductionunclassified

Absorption et désorption du dioxyde de souffre par des gouttes d'eau de fort diamètre en chute.

Lépinasse¹,

Marion²,

Guella³

et al. 2005

rseau

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Cet article concerne l’absorption et la désorption du SO2 par des gouttes d’eau de diamètre supérieur à 1mm en chute libre dans un mélange air-SO2 à faible et moyenne concentrations. Dans ce cas, le transfert résulte du couplage des résistances interne et externe à la goutte. Dans la phase liquide, un modèle local basé sur la vitesse de frottement inter faciale et le diamètre de la goutte permet le calcul du coefficient de transfert interne kl. Le coefficient de transfert externe kg dans la phase gazeuse est déterminé à l’aide d’une expression plus classique Afin de valider le modèle, des investigations expérimentales sont menées en absorption et en désorption sur une colonne de 2.3 m de hauteur dans laquelle le temps de séjour des gouttes est de l’ordre de la seconde. Le présent modèle simule fort bien l’ensemble de ces expériences réalisées pour différents diamètres de goutte [2.04 ; 4.31] mm et différentes concentrations [100 ; 2000] ppm. Le modèle proposé est aussi comparé avec succès à des résultats expérimentaux de la littérature à faible et moyenne concentrations pour des temps de contact beaucoup plus grands. Son domaine d’application couvre donc désormais l’absorption et la désorption du SO2 pour des concentrations comprises entre quelques ppm et quelque %.

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“…The model was validated experimentally by Amokrane et al [13]. For the case when the transfer resistance is located in the two phases, Walcek et al [9] and Mitra et al [14,15] used a modified Kronig-Brink model [16] to explain mass transfer into large drops. However, in order to obtain agreement between theoretical prediction and experimental results, they use an empirically determined effective diffusivity.…”

Section: Introductionmentioning

confidence: 99%

Mass Transfer Modeling of SO₂ into Large Water Drops

Alexandrova

Marion²,

Lépinasse³

et al. 2004

Chem Eng & Technol

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This article concerns the modeling of the SO 2 absorption and desorption by falling drops through air with low to high concentration of sulfur dioxide. In the liquid phase, a model based on local scales, interfacial liquid friction velocity and drop size diameter is used. In the continuous gas phase a more classical model is applied. Data obtained by the modeling of the SO 2 absorption and desorption by a single water drop are compared to published experimental results and a fairly good correspondence was found. On the other hand, the model shows that at high gas concentration (> 1 %) the internal resistance to diffusion dominates, while at low gas concentration (< 1000 ppb) the external resistance to diffusion dominates.

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SO2 absorption by water droplets.

Cited by 36 publications

References 1 publication

Liquid‐phase mass transfer in spray contactors

Liquid‐phase mass transfer in spray contactors

Absorption et désorption du dioxyde de souffre par des gouttes d'eau de fort diamètre en chute.

Mass Transfer Modeling of SO₂ into Large Water Drops

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SO2 absorption by water droplets.

Cited by 36 publications

References 1 publication

Liquid‐phase mass transfer in spray contactors

Liquid‐phase mass transfer in spray contactors

Absorption et désorption du dioxyde de souffre par des gouttes d'eau de fort diamètre en chute.

Mass Transfer Modeling of SO2 into Large Water Drops

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Product

Resources

About

Mass Transfer Modeling of SO₂ into Large Water Drops