Patent ID: 8540811

Claim:
A scrubber for the cleaning of gases, comprising: a plurality of scrubber stages ( 1 - 4 ) arranged in a scrubber tower with different ones of the plurality of scrubber stages at different levels above each other in the scrubber tower, including a lowest scrubber stage ( 1 ) and upper scrubber stages ( 2 , 3 , 4 ) all located above the lowest scrubber stage ( 1 ), each of the upper scrubber stages ( 2 , 3 , 4 ) comprising a ring-shaped tank ( 10 , 15 , 20 ) arranged inside the scrubber tower, each ring-shaped tank ( 10 , 15 , 20 ) arranged surrounding a central channel ( 9 , 14 , 19 ) through which a gas to be cleaned can pass upwards, each scrubber stage ( 1 , 2 , 3 , 4 ) of the scrubber having a circulation pump ( 27 , 30 , 34 ) arranged to feed, through feed pipes ( 29 , 33 , 37 ), scrubber fluid from a tank ( 7 , 10 , 15 , 20 ) at a bottom of a respective one of the scrubber stages ( 1 , 2 , 3 , 4 ) to spray beams ( 8 , 13 , 18 , 23 ) arranged at an upper part of the respective one of the scrubber stages ( 1 , 2 , 3 , 4 ) for distribution over a cross-section of the respective one of the scrubber stages ( 1 , 2 , 3 , 4 ) in a direction against an upwards flowing gas, and a bottom of each of the upper scrubber stages ( 2 , 3 , 4 ) further comprising a separation trough ( 11 , 16 , 21 ), located above a corresponding ring-shaped tank ( 10 , 15 , 20 ) of the upper scrubber stages ( 2 , 3 , 4 ), that separates the scrubber fluid from the upwards flowing gas, each said separation trough ( 11 , 16 , 21 ) comprising obliquely placed laminae ( 25 ) for leading scrubber fluid that arrives from above to trough channels ( 26 ) arranged under the laminae ( 25 ), said trough channels ( 26 ) having open ends configured so that the scrubber fluid is led directly to the corresponding ring-shaped tank ( 10 , 15 , 20 ) located underneath the separation trough ( 11 , 16 , 21 ).