Answer to Question #233535 in Chemical Engineering for pavani

Question #233535

Explain about the Tray settling chamber with neat sketch?

Expert's answer

Tray offer several advantages over bubble-cap trays, and their simpler and cheaper construction has led to their increasing use. The general form of the flow on a sieve tray is typical of a cross-flow system with perforations in the tray taking the place of the more complex bubble caps. The hydraulic flow conditions for such a tray are discussed in Volume 6 in the same manner as for the bubble-cap tray, by considering entrainment, flooding, pressure loss, and so on. The key differences in operation between these two types of tray should be noted. With the sieve tray the vapor passes vertically through the holes into the liquid on the tray, whereas with the bubble cap the vapor issues in an approximately horizontal direction from the slots. With the sieve plate the vapor velocity through the perforations must be greater than a certain minimum value in order to prevent the weeping of the liquid stream down through the holes. At the other extreme, a very high vapour velocity leads to excessive entrainment and loss of tray efficiency.

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