V-baffle

Flashing Feed and Vapor Distributors When the feed or reflux is a flashing feed, the vapor must be separated out of the liquid before the liquid enters a liquid distributor. At low velocities (only), this can be achieved by a bare nozzle (Fig. 14-70a). A V baffle (Fig. 14-70h) is sometimes installed as a primitive flashing feed or vapor distributor. 

FIG. 14-70 Flashing feed and vapor distributors, (a) Bare nozzle, (b) Rounded V baffle, (c) Peripheral flash box—the box extends right around the tower wall, with the collected liquid descending via downpipes to a liquid distributor below, (d) Gallery distributor—the feed enters the gallery area (upper plate). (Parts a-c, courtesy of Sulzer Chemtech part d, courtesy of Koch-Glitsch LP.)... 

Low-velocity vapor-only feeds often enter via bare nozzles or V baffles (above). At higher velocities, perforated vapor spargers are used. At high velocities, vapor horns and Schoepentoeters are often preferred. Alternatively or additionally, a vapor distributor may be mounted above the feed. The vapor distributor is a chimney tray (Fig. 14-72) where liquid is collected on the deck and flows via downcom-... 

Charge door 20 kkBtu/h V. baffle SOkkBtufli 40 kkBtu/h 20 kkBtu/h 20 kkBtu/h baffle Me- chMfy door ... 

Baffle separators of the Venetian blind, V, W, and wave types are widely used for spray removal. They have small space requirements and low pressure drops. They operate by diverting the gas stream and ejecting the droplets onto the collector baffles. Efficiencies of single stages may be only 40-60%, but by adding multiple stages, efficiencies approaching 100% may be obtained. 

Settling tanks are used to separate low solids concentration suspensions (solid-liquid separation devices usually comprising a vessel containing a single baffle which directs the suspension to the base from where it rises to the outlet, as illustrated in Figure 4.1. So long as the... 

Praktikum, n. practice practical course, laboratory course laboratory manual, praktisch, a. practical applied practised, praktizieren, v.t. practice, prall, a. tight, taut, stretched, tense plump. Prall, m. shock rebound reflection, -blech, n. deflecting plate, baffle, -elektrode, /. reflecting electrode. 

Staude,/. shrub, bush perennial herb, stauen, stow dam up baffle choke con gest. — v.i. choke. 

Figure 5-23H. Liquid motion patterns. A.) Vertical-tube baffles B.) Helical coil, no other baffles. By permission, Dunlap, J. R., Jr. and Rushton, J. H., A.I.Ch.E. Symposium Series, No. 5, V. 49, 1953, p. 137. American Institute of Chemical Engineers [6].

Figure 5-34. Typical vessel baffles to improve mixing performance. Adapted/modified by permission, Casto, L. V., Chem. Engr., Jan. 1, 1972, p. 97 [30].

Vertical side-W all baffles (Figures 5-23B and C and 5-34) projecting about Ko to K of the tank diameter into the v essel perform a helpful purpose in controlling vortex action. The baffles are set off from the tank w all a few inches to prev ent build-up of particles. 

For fluids w ith v iscosity up to 5000 cp, and ev en up to 30,000 cp for some situations, use standard baffles described abov e. The baffle widths can be reduced as the v iscosity increases from 5,000 cp to 12,000 cp. [30], and may be eliminated completely for viscosities over 12,000 cp. There are exceptions, such as mixing wide range of fluids of low and high viscosities. 

Special baffles. For certain mixing problems, v arious baffling arrangements have been found to be advantageous (see Reference [30]). 

Baffles that extend from the liquid level dowai, but not to, the tank bottom allow heavy swrirling action in the bottom of the tank, but no vortex at the top. Wdien baffles extend from the bottom up, but not to the liquid level, some v ortex and sw irling action will take place at the top. 

Figure 8-153. Simple side-to-side baffle arrangement, with liquid flow cascades, for baffle tray column. Used by permission. Fair, J. R., Hydrocarbon Processing, V. 72, No. 5 (1993) p. 75, Gulf Pub. Co., all rights reserved.

Figure 10-60. Shell-side mass velocity through baffle opening Gi,. (Used with permission Ning Hsing Chen, Chemical Engineering, V. 65, 1958. McGraw-Hill, Inc. All rights reserved.)...

Figure 10-73. Shell-side pressure loss for 3 shell-side baffle configurations—RODbaffles . (Used by permission Small, W. M., and Young, R. K. Heat Transfer Engineering, V. 2, 1979. Taylor and Francis, Inc., Philadelphia, PA. All rights reserved.)...

Figure 10-142. Pressure drop in fluid flowing across tube banks with segmental baffles. (Used by permission Buthod, A. P. Oil Gas Journal, V. 58, No. 3, 1960. PennWell Publishing Company. All rights reserved.)...

Figure 7.7, also taken from the work of RUSHTON et shows Np v.v Re data for a 150 mm diameter turbine with six flat blades. In addition, this figure also shows the effect of introducing baffles in the tank. BlSSELL et a/.(lSl have studied the effect of different types of baffles and their configuration on power consumption. 

Fig. 4. Influence of impeller type on stress Reference floe diameter dpv in dependency on specific impeller power P/V 4 baffles w/D = 0.1 H/D = 1 D = 0.4 m...

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