Liquid droplets, entrainment tendency

A simple K-value calculation might be helpful here. Let s use Eq. (26.6) and Fig. 26.1 to calculate the tendency to entrain droplets of liquid in the knockout (KO) drum shown ... 

Another type of distributor, not shown in Fig. 14-64, is the spray nozzle. It is usually not recommended for liquid distribution for two reasons. First, except for small columns, it is difficult to obtain a uniform spray pattern for the packing. The full-cone nozzle type is usually used, with the need for a bank of nozzles in larger columns. When there is more than one nozzle, the problem of overlap or underlap arises. A second reason for not using spray nozzles is fiieir tendency toward entrainment by the gas, especi ly the smaller droplets in the spray size distribution. However, some mass transfer in the spray can be expected. 

Entrainment coefficient A measure of the tendency of a flowing gas to carry droplets of liquid. 

The elimination of fine droplets of entrained slurry from the gas leaving the absorber has proven to be a difficult problem, primarily due to the tendency of the recovered liquid to deposit solid material on the mist eliminator surfaces causing plugging and inefficient operation. A number of points relevant to mist eliminator design and operation follow ... 

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