Dusting and stripping

In various industrial sectors, the problem of gas and fume purification arises.

Whether in the power generation sector or whenever fossil fuels (coal, fuel oil or emulsions) are burned, in the oil industry (e.g. FCC catalytic cracking units), in the industrial sector (cement plants, aluminum smelting...), we are confronted with a dust removal or de-dusting problem.), we are confronted with a problem of dust or vesicle removal, either direct because the fumes already contain the vesicles to be eliminated, or secondary because an operation to purify a gaseous pollutant such as SO ₂ has generated an aerosol or vesicular entrainment that needs to be treated. Selecting a dedusting/desiccanting equipment or process that delivers the performance required to comply with increasingly stringent regulations is becoming a delicate exercise in which the chances of making a mistake are not negligible. The study and rational choice of a gas pollution control system presuppose knowledge of the problem to be addressed, i.e. the nature of the suspension and the characteristics of the various separators under consideration. The aim of the following article is to provide concise, useful information to help the skilled tradesman make his choice. In any case, a more detailed study than is possible with the information given here alone is necessary before making a final selection.

Dust removal is any action or process in which a gas or fume is freed from a substantial fraction of the solids it carries by gas/solid separation. The devices or equipment performing this task are called dust collectors or dust separators. Excluded from this definition are very high-efficiency filters for cleanrooms, in medical or nuclear environments for example.

De-esiculation is any action or process in which a gas stream is freed from a substantial fraction of the droplets it carries, by gas/liquid separation. The devices or equipment performing this task are called devesiculators.