A new correlation for pressure drop of packed column.

Abstract

Bythe use of the experimental data of manyprevious studies, a newcorrelation for the pressure drop of a packed column was obtained in this work. The total pressure drop is expressed as the sum of the dry pressure drop and the wet pressure drop. The dry pressure drop originates mainly from the friction of gas rising through the void of the packed bed, and is expressed by the Fanning equation. The wet pressure drop originates from the increase in net gas velocity because of the smaller void of the packed bed owing to the liquid holdup, and therefore it is expressed as a function of liquid holdup, gas velocity, etc. The liquid holdup consists of static and dynamic holdups, and is correlated separately. Intr o du cti onIn previous studies, the method of dimensional analysis has been frequently used to correlate experimental values of the pressure drop of a packed column.Moreover, correlations of the pressure drop for dry packing (dry pressure drop) and for irrigated packing (total pressure drop) have been carried out separately, and no report expressing the total pressure drop consisting of the drop for dry packing and the residuals has apparently been published to date.Because of the smaller void of the packed bed in an operation with irrigation, the net gas velocity through the void becomes larger than that for dry packing. It is inferred that the difference between the total and dry pressure drops (wet pressure drop) is influenced strongly by the liquid holdup in the packed bed, because of the increase in the net gas velocity.However, there is a lack of studies referring to the relation of wet pressure drop and liquid holdup. In this paper, the experimental values of the many previous studies of the total pressure drop of a packed columnare correlated as the sumof the dry pressure drop and the wet pressure drop which is a function of liquid holdup, etc.

Hydraulic Studies in Low Height Packed Column with Regularly Packed Metal Raschig Rings

“…(10). Previously, very little information was reported regarding the operating dynamic liquid holdup caused by the friction loss at the gas-liquid interface because of the previous use of relatively low gas velocities in usual packed columns (Takahashi, Akagi and Ueyama, 1979). Therefore, we try to correlate three kinds of liquid holdup to predict total pressure drop for the low height regularly packed column using Eq.…”

Comparison of several packings for CO2 chemical absorption in a packed column

“…Values of the Billet and Schultes (1999) pressure drop constant (CP,0) and the Takahashi et al (1979) pressure drop parameter (k) in comparison to the literature values.…”

Determination Effects of Process Parameters on CO2 Reactive absorption System by Mathematical Modeling

“…All the terms are expressed in kmol/CO 2 per hour. The liquid holdup per tray (h L ) is approximated by using correlation found by Miyahara andTakahashi (1979 &1992…”