Patent ID: 8685141

Claim:
A method of cleaning a process gas containing sulphur dioxide by means of a wet scrubber comprising: atomizing an absorption liquid through active nozzles of at least one spray level system of said wet scrubber, with each of said at least one spray level system comprising at least a first tubular portion equipped with nozzles distributed substantially evenly over a horizontal cross-section of the wet scrubber and a second tubular portion equipped with nozzles distributed substantially evenly over a complete horizontal cross-section of the wet scrubber, controlling an amount of absorption liquid supplied to the first tubular portion independently from an amount of absorption liquid supplied to the second tubular portion in each of said at least one spray level system, operating said wet scrubber in at least a first operating mode with a spray level system active nozzle density of at least 0.7 nozzles/m 2 , supplying active nozzles of each spray level system with an absorption liquid flow of at least 10 m 3 /hour, and supplying a Total Flow of absorption liquid of at least 30 m 3 /hour/m 2 to the spray level system for a process gas with a vertical velocity of at least about 3.5 m/s.