Intermediate Feed Inlet Arrangements

Arrangement b is similar to arrangement a and is also only suitable for subcooled, low-velocity liquids where downcomer capacity is not critical. Compared to arrangement a, it may reduce the turbulence generated inside the downcomer otherwise it suffers from the same disadvantages. 

Arrangement c can be troublesome with feeds whose temperature substantially exceeds the tray liquid. If the feed nozzle is positioned too close to the outlet weir, the joint liquid path may be too short to 

Arrangement d is similar to arrangement c, but a channel baffle is added to avoid the impingement problem. This arrangement is suitable for vapor-containing feeds. The baffle may be straight or round and is open at its sides, top, and bottom. 

Arrangement e is similar to arrangement d, but a plate is added below the nozzle so that the liquid initially flows sideways instead of downward. This reduces the feed velocity at the inlet and is particularly suitable for high-velocity feeds, whether liquid or vapor. 

Arrangement f is similar to e, but the feed is introduced above the downcomer instead of above the tray to minimize interference with tray action. Minimizing this interference can be a distinct advantage with high-velocity feeds. 

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