Dualflow trays

The FRI data for dualflow trays have been used to form a tentative design method (Garcia and Fair, 2002). Data for Turbogrid trays have been included in the model. A generalized chart for predicting allowable vapor velocity, similar to that for cross flow trays given in Fig. 13.32(b), is included. 

FIGURE 12.39 View of a 1.2-m dualflow tray. (Courtesy of Fractionation Research, Inc.)... 

The character of the two-phase mixtnre above the tray floor is different from that of a conventional crossflow tray becanse of the connterflow of the phases, and this makes it possible for a counterflow tray to achieve more than one theoretical stage. A paper by Garcia and Fair provides approaches to modeling pressure drop and efficiency of dualflow trays, based on the FRI database. 

FIGURE 12.41 Flooding capacity of dualflow trays, based on FRI data. Column diameter = 1.2 m. (J. A. 

Trays, fractionating assembly of sieve trays, 428 bubblecap, 428,430-433 capacity, F-factor, 429 capacity, Jersey Critical, 432 capacity, Souders-Brown, 432 cartridge, 428 design data sheet, 429 dualflow, 426 efficiency, 439-456 Linde, 430 ripple, 426 sieve, 428,429 turbogrid, 426 types, 426 valve. 429.430.432 Trickle reactors, 576, 607 Tridiagonal matrix, 407 Trommels, 335... 

Counterflow Trays Dualflow Multiple downcomer Baffle trays (splash decks) ... 

A model for predicting the efficiency of dualflow-type trays has been reported and is mechanistic in character. A large efficiency database, provided by Fractionation Research, Inc. (FRl), was used in constracting the model. Efficiency data for counterflow baffle tray columns are sparse, and the only model available is based largely on a heat transfer database, using the appropriate analogies. 

In general, tray columns are constructed with downcomers to provide a separate How pelh for the liquid scream from tray lo tray. However, in some desigas such as the Turbogrid, Dualflow, Ripple Tray. Kiule... 

Countetflow trays Round openings ( Dualflow ) Rectangular openings ( Ttnbogrid )... 

In general, tray columns ate oonstritcled with downcomers to provide a separate flow padi for flie liquid stream from tray to tray. Ifowever, in some designs sitch as the Tutbogrid, Dualflow, Ripple Trqr, Kittle... 

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