Canadian Air Systems Co. is a designer and manufacturer of industrial air cleaning, including wet dust / fume collection. Air purification equipment using the principle of wet dust collection is available in numerous designs utilizing a set of principles and a wide variation in effectiveness, initial cost of operating and maintenance costs, space, arrangements and material.

Many industrial processes produce large quantities of pollutants gaseous or vaporized to be separated from the gas stream. The removal of these contaminants is usually achieved through absorption into a liquid or absorption by a solid medium. Incineration of the exhaust gas has also been used successfully for the removal of organic gases and vapors. Spray scrubbers of dry air is used to absorb and neutralize acidic gaseous contaminants in hot industrial gas streams. They use an alkali aerosol reacts with acid gases to form a salt. The process of the heat evaporates the liquid, resulting in a dry particle that is removed from the gas stream.

Typical applications industry for spray dry scrubbers are:

* Control of hydrochloric acid (HCl) emissions of hazardous biological waste incinerators.
* Control of emissions of sulfuric acid and sulfur trioxide from burning high-sulfur coal.
* Control of sulfur oxides, boric acid and hydrogen fluoride (HF) emissions from glass melting furnaces.

Spray gas scrubbers perform four operations:

1) atomization;
Drop of gas 2) the mixture;
3) drying of liquid droplets;
4) the disposal and collection of a dry product.

These operations are carried out in a tower or a specially designed container. The spray should disperse a liquid containing an alkaline compound that reacts with the acidic components of the gas stream. The liquid should be distributed evenly inside the dryer and mixes well with the hot gases in the droplets of a size that evaporates before hitting a drying surface.

In typical spray dryers used to control acid gas, the droplets have a diameter from 50 to 200 microns. The larger droplets are of greater concern because they could survive long enough to affect equipment surfaces. In general, a trade-off to be made between the greatest amount of liquid that can be sprayed and the largest droplets that can be tolerated by the team.

An important aspect of design spray dryer and the operation is the production and control of gas flow patterns within the drying chamber. Importnace Because the flow patterns, debuggers spray are generally classified on the basis of the direction of flow of gas into the chamber in relation to the spray:

– Scrubber in parallel in the food liquid is sprayed with hot gas flow;
– In Countercourent Scrubber food is sprayed against the flow of gas;
– In mixed flow Scrubber There is a parallel combination and countercurrent flow.

There are several types of sprayers. High rotational speed drives to achieve atomization through centrifugal motion. Nozzles are frequently used – the centrifugal pressure nozzles and nozzles pnneumatic. In the centrifugal pressure nozzle, the energy for atomization is supplied solely by the fluid pressure supply. In the two fluid nozzles, air (or steam), supplies most of the energy necessary to atomize the liquid. As a result, two fluid nozzle atomization may produce very fine, particularly with viscous materials.

Scrubbers Air Spray include metering valves, pumps and compressors, and controls to ensure chemical feed and the optimum temperature gas and cleaning system.

For additional information please go to target = "_blank" = href "http://www.nis-co.com/scrubber/Index.html"> http://www.nis-co.com/scrubber/Index.html.

Oleg Tchetchel
Engineer Air Transfer Systems
Canadian Air Systems
http://nis-co.com/contact/Index.html
href = "http://www.nis-co.com/scrubber/Index.html"> http://www.nis-co.com/scrubber/Index.html

About the Author:

Oleg Tchetchel
Designer of Air Moving Systems
Canadian Air Systems
http://nis-co.com/contact/Index.html

Article Source: ArticlesBase.com – Spray Dry Scrubbers for Air Cleaning

Gel Medium Transfers on Fabric

Comments are closed