Improving sieve tray performance with knitted mesh packing

Spagnolo, D. A.; Chuang, Karl T.

doi:10.1021/i200026a026

Cited by 13 publications

(9 citation statements)

References 6 publications

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“…This increase in Murphee efficiency can be explained by the fact that the addition of packing enhances the contat between liquid-vapor, as explained in Figure 4. Also, the froth with smaller bubble size tends to have a higher surface tension (Spagnolo, D. A., et al, 1984). (Chen, G. X., et al, 1992).…”

Section: Methodsmentioning

confidence: 99%

“…But it is not suitable for low flow rates liquid. (Spagnolo, D. A., & Chuang, K. T., 1984) are the pioneer to reveal on the possibility of combining sieve tray column with packing. To be precise, they incorporated a knitted mesh packing with bed size of 25 mm on the trays for the production of Girdler-Sulfide heavy water at the operating pressure and temperature of 2.17 MPa and 32 °C, respectively, where they found increasing tray efficiency by 3-20%.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Appended Wire Mesh Packing in Sieve Tray Distillation Column of Ethanol-Water System

Taufany¹,

Soewarno²,

Sutanto³

et al. 2015

MAS

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For the separation process in liquid-liquid mixture such as ethanol-water mixture, a sieve tray distillation column is an alternatif for affordable process and maintenance. However to date, this sieve tray system is still currently having a lower Murphee efficiency and smaller interfacial area, as compared to other tray system, that is, either a bubble cap or valve tray. Therefore it is of important to optimize the performance of sieve tray distillation by means of adding the wire mesh packing on that tray, as being the aim of the present study. This study is conducted by using a batch sieve tray distillation system, where the wire mesh packing is added on the third tray that is calculated from the top of the column, to avoid flooding inside the column. Here the resulting fermented molasses of containing a 10% volume of ethanol is used as a mixture distillation feed. The height of the wire mesh packing being studied is varied as 5 cm, 3 cm, and 2 cm. Our results showed that the Murphee efficiency obtained by the variation of the packing height of 5 cm, 3 cm, 2 cm and without packing were 73.5%, 66.27%, 56.86%, and 46.7% respectively, and were increased by subsequent level of the packing height. The corresponding hydrodynamic properties of this appended packing sieve tray distillation by means of the interfacial area were 11.88 cm 2 /cm 3 , 0.48 cm 2 /cm 3 , and 0.32 cm 2 /cm 3 , while its pressure drop measured from the water manometer height were 38.33 cm H 2 O/m, 30 cm H 2 O/m, 10 cm H 2 O/m for the packing height of 5 cm, 3 cm, 2 cm height, respectively. The increasing of the performance of appended packing sieve tray distillation by means of the Murphee efficiency is explained by the increasing of the interfacial area for vapour-liquid than the tray itself. This preliminary study is expected to be a pioneer study of strategy to increase the performance of conventional sieve tray distillation that is known as a kind of affordable distillation process.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of Appended Wire Mesh Packing in Sieve Tray Distillation Column of Ethanol-Water System

Taufany¹,

Soewarno²,

Sutanto³

et al. 2015

MAS

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“…Unfor- (95-125 "C). Figure 4 shows a simplified schematic of the GS pilot plant which has been described elsewhere (Spagnolo and Chuang, 1984;Spagnolo and Chuang, 1986). A 311 mm diameter three tray column, consisting of trays having perforations of 12.7 mm diameter, an open hole area of 10.7% and tray spacing of 381 mm was used.…”

Section: Cpllmentioning

confidence: 99%

“…To monitor heat transfer tray performance utilizing the Results GAMMA SCANNING model previously discussed, three measurements were required; overall heat transfer tray efficiency ( E H V ) , tray froth height (hf) and average froth density ( E~) . EHV was calculated from temperature measurements using Equation profile on the tray (Spagnolo and Chuang, 1984). production plant observations.…”

Section: Experimental Descriptionmentioning

confidence: 99%

Heat transfer modelling of sieve trays

et al. 1988

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A heat transfer model that accounts for both gas and liquid phase resistance was developed for sieve trays where the overall heat transfer coefficient is expressed as a function of Sauter‐mean bubble diameter. These diameters, obtained from pilot plant data, were correlated and used to predict point efficiencies on production plant trays. Applying the appropriate liquid flow distribution model allows the prediction of overall tray efficiencies. Predicted temperature profiles have agreed well with measured plant profiles and tray changes at the production plant have resulted in steam savings that were adequately predicted by the model.

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“…Bain and Van Winkle (1961) and Smith (1963) found that trays with small hole size provided good vapour-liquid distribution and reduced weeping, while increasing tray efficiency by producing small bubbles with large interfacial area. Spagnolo and Chuang (1984) were the first to report on the performance of sieve trays combined with knitted mesh packing for heavy-water production in an absorption column. However the expense of manufacturing trays with holes smaller than 2 mm and the difficulty in avoiding clogging of these holes limits their applications to a few very clean systems.…”

mentioning

confidence: 99%

Performance of combined mesh packing and sieve tray in distillation

Chen

Afacan

et al. 1990

Can J Chem Eng

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The hydraulic and mass transfer performance of a combined knitted mesh packing and sieve tray has been measured for the distillation of methanol-water mixtures. It was found that by adding a shallow bed of packing, the Murphree tray efficiency increased by 40-50% over a wide range of concentrations and flow rates. This increase in tray efficiency can be attributed to a much smaller and more uniform bubble formation on the packed tray. Hydraulic measurements have shown that the packed trays have lower weeping and entrainment, as well as slightly higher froth heights and pressure drops.La performance hydraulique et la performance du transfen de matikre d'un garnissage B mailles perfortes et d'un plateau perfort combinks, a ktk mesurke pour la distillation de mtlanges mkthanol-eau. On a trouvt qu'en ajoutant un lit de garnissage peu profond, l'efficacitt de Murphree du plateau augmentait de 40 B 50 % pour une large gamme de concentrations et de debits. Cette augmentation de l'efficacitk du plateau peut &tre attribute B une formation de bulles plus petites et plus uniformes sur le plateau garni. Des mesures hydrauliques montrent que les fuites et I'entrainement des plateaux garnis sont plus faibles et que la hauteur de mousse et les pertes de charge sont lkgbrement plus grandes.

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Improving sieve tray performance with knitted mesh packing

Cited by 13 publications

References 6 publications

Performance of Appended Wire Mesh Packing in Sieve Tray Distillation Column of Ethanol-Water System

Performance of Appended Wire Mesh Packing in Sieve Tray Distillation Column of Ethanol-Water System

Heat transfer modelling of sieve trays

Performance of combined mesh packing and sieve tray in distillation

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