Kaskade plate

The various perforated or bar-type plates have hi capacities (see curve 2y Fig. 16-13) and appear to produce the same efficiencies as bubble or Kaskade plates. Of even greater importance, they are mechanically very simple compared with bubble plates. In several designs, no downcomers whatever are provided. Turbogrid trays fail to function properly if the actual load is under about 40 per cent of the design load. 

More elaborate arrangements are the familiar bubble-plate (Fig. 16-6) and such modifications as tunnel trays (vapor slots and vapor troughs extend across the plate) and Uniflux trays, float-valve bubble trays, perforated trays with downcomers for the liquid, and Kaskade-type (Bentuii and Flexitray) trays. 

Liquid flows across the plate as froth and stands in the downcomer to a height (inches), in the case of the Koch Engineering Company Kaskade tray, which is double the pressure drop (also stated in inches of liquid) across the plate. Perhaps this is a coincidence, but Souders et al. report the same general relationship. At high rates of liquid flow the froth may not have time to separate as it flows through the downcomer, and hence the computed liquid height (no froth) in the downcomer must be about doubled. Kirkbride also recommends that the height of liquid be multiplied by 2 when computed by his approximate formula [Eq. 

Maximum for perfectly designed bubble trays operating at most favorable liquid loads. Also, normal performance of Kaskade, Turbogrid, perforated, and similar plate constructions. " Also, liquid-washed side-to-side pans. 

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See also in sourсe #XX -- [ , , , , ]

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