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chimney trays have the following advan-tages:
1. They minimize liquid leakage to the section below. For this reason,they are preferred When all liquid in a column section is withdrawn (“total drawoff’).
When most (but not all) of the liquid is to be withdrawn, because exces-sive leakage will starve the draw off of liquid.
In low-liquid-load applications.
2. They provide greater residence times for vapor disentrainment , a greater surge volume, a better buffer against upsets, and smoother control. Therefore, they are frequently preferred
When the intermediate draw off is pumped.
When most of the liquid in a column section is withdrawn.
When two-liquid phase separation is required.
3. In packed columns, chimney trays are the most effective liquid collection devices for high liquid flow rate services, for inter re boilers,and for once-through re boilers. They are also sometimes used for collecting liquid from an upper bed for redistribution (when there distributor is not self-collecting), and as vapor distributors.
4. In tray columns, chimney trays do not suffer from unsealing problems and are generally less troublesome than down comer trap outs. The main drawback of chimney trays is that they consume more column height than alternative draw off devices, resulting in a more expensive arrangement. Chimney trays are also relatively high pressure-drop devices, which is a major disadvantage in packed col-umns operating in deep vacuum.
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