1.3  Feed inlets and side stream draws

The feed liquid is commonly introduced vertically downward into the downcomer of the tray above the feed point through an open pipe. A slotted branch distributor is used for of flashing feed (liquid) to avoid early flooding (Figure 8.4). The vapor is generally entered the column tangentially through an open inlet nozzle placed almost at right angles to the liquid flow on the above tray. The clearance between the feed pipe end and feed plate below is normally kept more than 0.4 m when the feed liquid is flashed in active tray area. Wider tray spacing is needed where the feed pipe and the side stream takeoff pipe to provide a liquid seal are installed.

Figure 8.4. (a) Takeoff nozzles (draw off) and, (b) Feed ( [1] page 564 ).