Hygrade Industrial Plastics Limited: Packed Tower Scrubbers

Hygrade Industrial Plasyics: Leaders in Air Pollution Controll

3-Stage packed Tower Scrubber for the removal of Oxides of Nitrogen.”

Hygrade’s packed tower scrubbers are built according to the counter-flow principle:

the gas or airstream travels upwards through the tower, meeting the scrubber liquid (which flows downwards) on its way.

Gas absorption within packed towers takes place in one of two ways, either:

> By physical contact and dissolution of gas in water

or by

> A scrubbing reaction between the gas and a scrubbing reagent

The performance and efficiency of a packed tower scrubber is generally dependent upon the following factors:

> The packing surface area over which gas/liquid transfer will occur
> The even distribution of the scrubbing liquor throughout the packing
> Gas velocity through the packed bed
> The liquor flow rate through the packed bed

A packed tower consists of the following main sections:

Base Section or Sump Acts as a liquid reservoir for the column and is connected to the recirculation pump inlet. It also has connections for the adding of water, dosing of chemicals and drainage of spent liquor.

Packed Bed Section, throughout which gas absorption occurs. The bed comprises many pieces of loose random packing, the size and shape of which is selected to give optimum scrubber performance. The bed is supported on a purpose built packing support plate.

Upper Section Made up of the liquid distributor to ensure even liquor distribution across the packing. The distributor will be a spray system, pan and riser or a trough type depending on the application. Above the distributor, a droplet eliminator prevents liquid carry over. The eliminator could be of a vertical or horizontal design depending on the outlet or discharge requirement.

Typical examples of gases removed by these types of scrubber include:

> Hydrogen Chloride
> Ammonia
> Oxides of Nitrogen
> Sulphur Dioxide
> Phosgene.
> Chlorine
> Hydrogen Sulphide
> Amines
> Bromine
> Nitric Acid
> Methanol
> Formaldehyde

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