| abstract |
In addition to a sulphur-containing material (4) to be burned and an oxygen-containing gas (5), a pulverous calcium or magnesium hydroxide (6) is fed, in excess proportion to the sulphur dioxide gas produced into the combustion chamber of the furnace (1), and water (9) or steam is sprayed separately into the flue gases (8) containing calcium oxide or magnesium oxide either in the furnace or into the flue gases leaving the furnace. Alternatively and preferably, the pulverous hydroxide (6') can be fed directly into the flue gases leaving the furnace (1), either in a flue gas conduit (7) or in a reactor (2) downstream of it, where the hydroxide is activated by means of water (9) or steam. <IMAGE> |