Scrubbers are specialized exhaust systems that clean the effluent from a process prior to discharge to the atmosphere. Scrubbers are essentially air washers that use acids, caustics, filtration, and chemical reactions to neutralize harmful substances in the exhaust stream.
The scrubber itself is usually a component of a scrubbed exhaust system and will typically be located at the termination point of the system, immediately ahead of the exhaust fans. Scrubbers consist of an enlarged section of the duct that contains the various spray trees.
The dirty air to be cleaned is sucked into the tower by a blower at the end of the system. In the tower are the spraying units that fall on the particulate matter in the air, making them heavy and thus allowing clean air to flow through the chimney.
Venturi Scrubbers are high performance system which can reduce the contamination level of flue gas up to 99%. They can remove both particulate matter and gaseous pollutant. The flue gas is scrubbed at high speed and pressure at the Venturi and gas velocity is dropped at the Separator. The separator can be converted to spray tower in case the concentration of pollutant is very high. The material of construction of Ventruri is depended on the composition and temperature of the flue gases entering the system. When the flue gases are rich in SOx and NOx then the scrubbing process generates acid and consequently high-grade stainless steel such as SS-316 has to be used. They can be used for any industry where the concentration of particulate matter or gaseous pollutant is high. Our installations in base metal refining sectors where aluminum and copper scraps are refined at high temperature are exemplary.
Spray Towers are very effective for large volume of flue gas with low concentration of pollutant.We offer designs in single or multistage to increase the efficiency. They can be manufactured in mild steel,SS-304,SS-316 and FRP coated as per application and requirement.
A Packed Bed Scrubber is a wet type scrubber that removes soluble chemicals, fumes, and odors. Contaminated gas flows through a specially designed packing media that is wetted with re-circulated liquid. The liquid solvent absorbs the gas pollutant by physical or chemical means. A blowdown from the tank with makeup water addition removes contaminant products before they precipitate.
Spray towers have been used effectively to remove large particles and highly soluble gases. The pressure drops across the towers are very low - usually less than 2.5 cm (1.0 in) of water, thus, the scrubber operating costs are low.