Turbogrid

The open area for these plates ranges from 15 to 30 percent of the total cross section compared with 5 to 15 percent for sieve plates and 8 to 15 percent for bubble-cap plates. Hole sizes range from 6 to 25 mm (1/4 to 1 in), and slot widths from 6 to 12 mm (14 to V2 in). The Turbogrid and Ripple plates are proprietary devices. 

Turbogrid plate—4.6-mm (0.18-in) slot width, 14.7 percent open area... 

Sutherland [69] reports for air-water entrainment of 0.0001 to 0.1 lb liquid/lb vapor, averaging 0.01 for 15-in. tray spacing at hole velocity Fj values of 3 to 15. Fh = Vq These values are 1-10% of bubble cap plates. Simkin et al., [64] reports a comparison with the Turbogrid tray giving only 3-60% of the entrainment of bubble caps over a wide range of operation. 

These three types of trays have a common feature in that they all have separate downcomers for the passage of liquid from each tray to the one below. There is another class of tray which has no separate downcomers and yet it still employs a tray type of construction giving a hydrodynamic performance between that of a packed and a plate column. Two examples of this type of device are the Kittel plate and a Turbogrid tray(53). Design data for these trays are sparse in the literature and the manufacturer s recommendations should be sought. 

Engineering Staff, Shell Development Company, Emeryville, California Chem. Eng. Prog. 50 (1954) 57. Turbogrid distillation trays. 

Turbogrid, with slots l/4-l/2in. wide, developed by Shell... 

TABLE 13.16. Efficiency Data of Some Operations with Bubblecap, Ripple, and Turbogrid Trays... 

A variation of the normal sieve tray is the Turbogrid tray developed by the Shell Development Company. The Turbogrid tray uses slots instead of circular holes and operates as a counterflow plate unit with no downcomers. A typical tray consists of a flat grid of parallel slots. The slots can be stamped perforations in a flat metal sheet or the open spaces between parallel bars. 

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... 

TEMA classification, 200 tube count table, 203 Turbine pumps, 134, 139, 140, 142, 143 Turner equation, leaching, 466 Turbogrid trays, 426 Two-phase fluid flow. 111, 113-117 correlations, 115 granular beds, 118 homogeneous model, 113 Lockhart-Martinelli method, 115, 116... 

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. 

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