By Paul Mathias, D. E. Steinmeyer, W. R. Penney, B. B. Crocker, James R. Fair Henry Z. Kister
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Additional info for Perry's Chemical Engineers' Handbook. Section 14
Antijump baffles (Fig. 14-24) are sometimes installed just above center and off-center downcomers of multipass trays to prevent liquid from one pass skipping across the downcomer onto the next pass. Such liquid jump adds to the liquid load on each pass, leading to premature flooding. These baffles are essential with proprietary trays that induce forward push (see below). Clearance under the Downcomer Restricting the downcomer bottom opening prevents gas from the tray from rising up the downcomer and interfering with its liquid descent (downcomer unsealing).
Downcomer liquid load For downcomer design, the liquid load is usually defined as the liquid velocity at the downcomer entrance (m/s or ft/s): Q volume of liquid QD = ᎏᎏᎏ = ᎏ downcomer entrance area ADT AB (14-78) (14-79) Liquid and gas FLOW REGIMES ON TRAYS Liquid with bubbles Tray below FIG. 14-17 Schematic of a tray operating in the froth regime. (Based on H. Z. ) net area represents the smallest area available for vapor flow in the intertray spacing. Bubbling area AB (also called active area) The total tower cross-sectional area minus the sum of downcomer top area ADT, downcomer seal area ADB, and any other nonperforated areas on the tray.
Typical open-slot areas for moving valve trays are 14 to 15 percent of the bubbling area. Here the higher hole areas can be afforded due to the high turndown of the valves. Moving valves can have a sharp or a smooth (“venturi”) orifice. The venturi valves have one-half the dry pressure drop of the sharporifice valves, but are far more prone to weeping and channeling than the sharp-orifice valves. Sharp orifices are almost always preferred. Multipass Balancing There are two balancing philosophies: equal bubbling areas and equal flow path lengths.
Perry's Chemical Engineers' Handbook. Section 14 by Paul Mathias, D. E. Steinmeyer, W. R. Penney, B. B. Crocker, James R. Fair Henry Z. Kister