Improvements in or relating to absorption of pollutant material from a polluted gas.

摘要

In a method of absorbing pollutant material e.g. sulphur dioxide from a polluted gas, an aqueous suspension of a solid absorbent e.g. calcium hydroxide is sprayed into the gas; and the ambient conditions in the gas are such that all the water is evaporated and the absorption product is dried as it is formed. The spray droplet size is controlled to be a practical maximum consistent with maintaining the ambient conditions. The spray droplet size may be so controlled that the arithmetical average spray droplet lifetime is at least 80% of the theoretical maximum spray droplet lifetime consistent with maintaining the ambient conditions.

The aqueous suspension may be sprayed into the gas in a tower (6) by means of rotary-cup atomisers (9). Calcium hydroxide slurry is supplied from vessel (7), and the tower (6) is followed by a bag filter or electroprecipitator (5).