Amerair International

Products» Odor Control Systems» Amerair's Scrubbing Technique

Wet scrubbers have been used successfully for many years as air pollution control devices to remove pollutants from

air streams containing both gases and liquid or solid particulates.

Where multiple pollutants are present in a gas stream, normally the wet scrubber is selected due to its capability of

removing gaseous contaminants by gas-liquid diffusional processes as well as eliminating liquid and solid particulates

by mechanisms of inertial impaction, cyclonic motion or interception. However, wet scrubber designs vary widely in their mass transfer and particulate collection capability. Engineers

selecting such equipment must be careful to examine factors of scrubber design such as:

1. Number of mass transfer units available

2. Number of mass transfer units that can be added in the future

3. Pressure drop vs. mass transfer efficiency

4. Particulate removal efficiency vs. pressure drop

5. Reliability of operation

For air pollution control problems where only gaseous contaminants must be abated, the wet packed scrubber is

usually the best choice. It is 'differential' in nature that absorption efficiency is a function of packing depth and normally a packed scrubber can

be designed to give any desired collection efficiency. This assumes that a large amount of absorbing liquid is recycled,

so that the concentration of solute gas in the liquid does not vary significantly as absorption occurs or there is a

chemical reaction between the solute gas and scrubbing liquid.

The design of the scrubber housing considers the following factors:

• Flat concrete foundation of the scrubber

• The shell thickness of wall and bottom is adequate to take stresses caused by the static pressure developed by

the fan and the internals

• Maximum corrosion resistance for both the interior and exterior surfaces is provided to ensure long service life

and low maintenance cost.

• Access manholes, nozzles and internal supports attached to the shell are designed to withstand all expected

stresses and to ensure the same corrosion resistance as the shell • Access manway to reach upper section of scrubber

The offered scrubber system shall be according to your requirement and will be fabricated from corrosion resistant

plastic to combine high collection efficiency with low weight, low operating cost and long service life.

In accordance with your request for removal of gaseous contaminants as specified, AMERAIR scrubber system will be

a counter current packed vertical tower or horizontal packed scrubber with an integral sump tank.

The packing will be followed by a mist eliminator to prevent droplet carry-over.

Liquid distribution using large orifice, low pressure drop nozzles with full cone spray patterns provide good initial

distribution, which is highly important with K-Rosette packing. While the open configuration of K-Rosette packing

reduces the possibility of misdistribution, initial liquid distribution should provide full coverage because low pressure

drop random packing will not re-distribute the liquid as it is with extended surface packings.

Air Pollution Control & Monitoring