Spray Tower Scrubber

Mechanism

Spray towers are very simple, low-energy wet scrubbers.

In these scrubbers, the particulate-laden gas stream is introduced into a chamber where it comes into contact with liquid droplets generated by multiple spray zones.

These scrubbers are also known as pre-formed spray scrubbers, since the liquid is formed into droplets prior to contact with the gas stream.

The size of the droplets generated by the spray nozzles is controlled to maximize liquid-particle contact and, consequently, scrubber collection efficiency.

Spray towers are cylindrical or rectangular chambers that can be installed vertically or horizontally. In vertical spray towers, the gas stream flows up through the chamber and encounters several sets of spray nozzles producing liquid droplets.

A de-mister at the top of the spray tower removes liquid droplets and wetted PM from the exiting gas.

Scrubbing liquid and wetted PM also drain from the bottom of the tower in the form of slurry. Horizontal spray chambers operate in the same manner, except for the fact that the gas flows horizontally through the device.