GAS SCRUBBERS

A scrubber is a waste gas treatment installation in which a gas stream is brought into intensive contact with a liquid, with the aim of allowing certain gaseous components to pass from the gas to the liquid. Scrubbers can be employed as an emission-limiting technique for many gaseous emissions. Scrubbing is also referred to as absorption.

Gas scrubbers can also be distinguished by the set-up of the wash section, e.g. with or without a built-in device. The built-in device could be a bulk or structured packing or a construction with plates or a rotating disk.

Auxiliary materials

1-Water. Water use is determined by the in and out-going concentrations of gaseous components.

2-Reagents: Acids, alkalis, bleach, peroxide etc. depending on used variant.

3-Apart from water, no specific chemicals are needed for the removal of HC1 from flue gases.

Environmental aspects

Waste water. In most cases, waste water needs to be purified. In certain cases it can be evaporated and reprocessed for the recuperation or recovery of products.

Acidic leachate will be partly drained (depending on pH). The leachate is supplemented by water. The released leachate must be treated prior to being discharged.

Advantages

Broad application spectrum;

Very high removal yields;

Compact installation and easy to maintain;

Relatively simple technology;

Can also be used to cool hot gas flows (quencher)

Disadvantages

Waste water must be treated;

Water and reagents used;

When dust is simultaneously collected, drainage is necessary;

Susceptible to frost;

Depending on the location, a support construction may be necessary;