| 摘要 |
PCT No. PCT/SE95/00203 Sec. 371 Date Sep. 30, 1996 Sec. 102(e) Date Sep. 30, 1996 PCT Filed Feb. 27, 1995 PCT Pub. No. WO95/26807 PCT Pub. Date Oct. 12, 1995A method for removing sulphur dioxide from a gas, such as a flue gas, is disclosed. In the method, the sulphur-dioxide-containing gas is conducted upwards through at least one layer of aqueous absorbent suspension, whose absorbent is lime or limestone, the volume of the suspension layer being about 100-1000 l, calculated per m3 of sulphur-dioxide-containing gas flowing through the layer every second, the static height of the layer being at least about 20 mm, preferably about 300-600 mm, and the gas flow through the layer being such that turbulence is generated in the layer, that the pH of the absorbent suspension is adjusted to about 3.0-5.5 with the aid a buffer, preferably adipic acid, and that, separately from the sulphur-dioxide-containing gas, an oxygen-containing gas, preferably air, is supplied to the layer of absorbent suspension, preferably to the lower part of the layer of absorbent suspension and in such an amount that the molar ratio of oxygen to sulphur dioxide supplied to the suspension layer ranges from about 1:1 to about 25:1. |
