| 摘要 |
<p>A method and a device for removing sulphur dioxide from a gas, preferably a flue gas, by means of an aqueous suspension of an absorbent, preferably limestone, are disclosed. In the method, the flue gas is conducted through an apertured plate (3) on which is provided a flowing layer of the absorbent suspension having a static height of at least about 100 mm, preferably about 200-500 mm, and a volume of about 50-500 l, calculated per m3 of flue gas flowing through the layer every second. The layer of absorbent suspension flows along the apertured plate (3) at a flow rate of about 5-100 l/s, preferably about 10-30 l/s, calculated on the static volume through which flows 1 m3 of sulphur-dioxide-containing gas per second. The device comprises an inlet (1) and an outlet (2) for the flue gas; an apertured plate (3); a tank (5) for the absorbent suspension; at least one inlet duct (6) arranged between the tank (5) and the apertured plate (3); means (8, 10, 11, 12) for supplying the absorbent suspension; at least one outlet duct (7) for recycling the absorbent suspension from the apertured plate (3) to the tank (5); and means (9, 12; 13; 14; 16) for supplying air, absorbent and water, as well as for withdrawing gypsum.</p> |
