Air Pollution Control Equipment

I used to be in college, and I appreciate that you were honest. I will give you a starting point. Look up "air scrubbers".

Scrubber is a device or an equipment, which is used for cleaning gases from solubles or particulates. It is an air washer with refinements of even treating fumes on line.

Impurities which are to be removed before it is allowed to be mixed in the ambient are- acidic vapours like HCL, H2SO4, Chlorine, SO2, or any other foaming fumes, alkaline vapours, which are harmful, like caustic,

particulates- solid fines, which are defined as non solubles but of size up to .5 microns which do not get separated by filters of any kind.

Scrubbers are designed in various types. Some are- Packed Tower, Ventury, Dynamic, Catalytic, Multi flow, Multi tower.

Packed Tower Scrubber
In this design, a tower is constructed and filled with the material having large contact area. Pall rings, Rachis rings or similar items are filled in to provide large surface for contact. Coarse droplet of solute, normally wale, are sprayed from top. Water trickling down, wets the surface area. Fumes containing vapors or particulates go up through this surface area as counter flow. Due to slow motion, fumes come in contact with the fumes over surface and take up the material releasing the air and cleaning. It has larger capital cost and low power needs.

It is normally made in plastic and surface area material is similar.

Ventury Scrubber
In this design, fumes are moved through suitably designed 'ventury'. Velocity of gas is increased. Solutes are sprayed in the stream. Due to this the gas gets fully saturated. Solubles & solids get entrenched and thus get separated.

Muti flow Scrubber
This is a combination of Packed tower and Ventury types. Gas velocities are changed suddenly and drops fall out separation rate is high.

Dynamic Scrubber
When fumes are moved faster, solutes are added dynamically with the aid of external air pressure. Drops are converted to the finest form. Thus fumes are made totally wet and largest liquid surface area is provided for best performance.

Catalytic Scrubber
In this design, solid catalysts are provided as surface area along with solutes sprayed over. Chemical reaction becomes easy and recovery of valuable returns is also made easy.

Multi Tower Scrubber
When more than one vapor or particulates are to be removed from the stream, it is recommended to use multi purpose multi tower unit. Overall space, power and cost is saved.

To recommend suitable equipment following minimum details are needed-

• Gas flow in Nm3/hr
• Gas density in kg/m3
• Gas temp in 0C
• Solids presents in mg/m3
• Solid details
• Vapor details - Names - quantity gm/m3
• Flow details - process in short
• Layout - where fume is generated
• Location of scrubber possible.
• Material of construction - if insisted.
• Power limits
• Water available - unlimited/recirculation
• Water quantity available - lit/hour
• Effluent treatment - necessary/not necessary
• Effluent treatment plant - existing/not existing
• If not existing, ETP needed - yes/no
• Any other information, which can help in selecting the equipment.
• Any other conditions to be fulfilled.
• Pollution control department comments, if any

Air Pollution Control System

Tips on air pollution controls are-1.) Compare and choose technologies that use minimum electricity, fuel and solvents 2.)Consider using cleaner alternative energy whenever possible, e.g. solar or wind 3.)Use fuel of the quality specified by the manufacturer or supplier of your equipment 4.)Perform regular inspections and maintenance of exhaust-emitting equipment5.)Phase out air-conditioners and refrigerators that use CFC refrigerants 6.)Use halon-free fire extinguishers

Check this site out. It has very detailed information on the subject.

http://yosemite.epa.gov/oaqps/eogtrain.nsf/homeform?openform