B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/349
B01D 53/14 (2006.01) B01D 53/34 (2006.01) B01D 53/50 (2006.01)
Patent
CA 2001235
Abstract The invention relates to a process for the removal of sul- fur dioxide from hot flue gases (8) which have been ob- tained by burning a sulfur-containing substance (4) in a boiler (1). In the process, a substance (6), such as lime or limestone, which reacts with sulfur dioxide to form a solid product is fed into the boiler or into the reaction zone (2) subsequent to the boiler, the hot flue gases (8) are cooled in the reaction zone (2) by feeding into it at maximum such an amount of water as the hot flue gases are capable of evaporating, and the substantially dry solid products are separated (3) in the form of dust (10) from the cooled flue gases. According to the invention, the flue gases (11) thus obtained are scrubbed (13) with an alkaline aqueous solution (15) in order to remove the remaining sulfur dioxide and dust from the flue gases, and part (9') of the cycled scrubbing solution (9) is fed into the boiler (1) or the reaction zone (2) in order to evaporate the water from this solution.
Alppi Hannu
Kenakkala Timo
Kokkonen Kari
Tuominiemi Seppo
Alppi Hannu
Fetherstonhaugh & Co.
Kenakkala Timo
Kokkonen Kari
Oy Tampella Ab
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