wet scrubber describes a variety of devices that remove pollutants from a furnace flue gas or from other gas streams. In a wet scrubber, the polluted gas stream is brought into contact with the scrubbing liquid, by spraying it with the liquid, by forcing it through a pool of liquid, or by some other contact method, so as to remove the pollutants.Wet scrubbers can neutralize corrosive gases.
Spray chambers 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 spray nozzles.The size of the droplets generated by the spray nozzles is controlled to maximize liquid-particle contact and, consequently, scrubber collection efficiency
Packed-bed scrubbers consist of a chamber containing layers of variously-shaped packing material, such as raschig rings, spiral rings, and berl saddles, that provide a large surface area for liquid particle contact. The packing is held in place by wire mesh retainers and supported by a plate near the bottom of the scrubber.
The Apzem Venturi scrubber efficiently collects fine particulate and mists. Scrubbing liquid is atomized into fine droplets which entrap particles. The Venturi Scrubber uses the differential between high velocity gases and free-flowing water to create droplets which entrap contaminants, hold them in suspension and deliver them as a highly concentrated slurry.
A cyclonic spray chamber is similar to a spray tower with one major difference. The gas stream is introduced to produce cyclonic motion inside the chamber. This motion contributes to higher gas velocities, more effective particle and droplet separation, and higher collection efficiency.
In a fiber-bed scrubbers, the moisture-laden gas stream passes through mats of packing fibers, such as spun glass, fiber glass, and steel. The fiber mats are often also spray wetted with the scrubbing liquid