Scrubber

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).