Efficient gas absorption depends on the following:
1. Intimate contact
2. Efficient Heat Transfer

Scrubber Unit

This is achieved in a Falling Film Absorber which is essentially a shell & tube heat exchanger in which both gas to be absorbed and absorbing liquid flow co-currently downward with extraction of heat by circulation of coolant in the shell. The abssorbing liquid is circulated through a tank till desired concentration is achieved. The liquid flows at such a rate that the tubes do not flow full of the liquid but instead, descends by gravity along the inner walls of the tubes as a thin film. Obviously, this produces a much greater linear velocity for a giver rate flow than could be obtained if the tube flowed full.

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The equipment works as a number of water cooled-wall columns in parallel and each tube is provided with distribution system on top to effect uniform distribution of both liquid and gas and also formation of a thin liquid film on the inner surface of the tube.

 Sr. No.Nominal Size (mm)Absorber Area (m2)No. Of Tubes/Tube OD (mm)Max. Gas Absorption Rate (Pure HCL)* (Kg/hr)Max. Acid Prod. Rate (As 30% HCL)( Kg/hr)Height (m)
 1801.004/20301004400
 210L20L40102040
 21001.767/20602004500
 31504.8019/201505004600
 42257.8031/202508334920
 530015.3061/2050016675050
 640036.00143/2117539175300
 745047.00187/20150050005700
 860084.00333/20270090005800