Abstract: Apparatus for flue gas cleaning comprising a scrubbing chamber, a flue gas feeder, a flue gas discharger, a drain for used scrubbing water and a device for feeding and atomizing the scrubbing water. The scrubbing chamber can be divided into a scrubbing zone, a centrifuging zone and a fan zone, and arranged in the scrubbing chamber is a device which is rotatable about a horizontal axis and which conveys the flue gas and the atomized scrubbing water in helical movements in a horizontal direction through the scrubbing chamber. Preferably, the scrubbing water is circulated, wherein there may be provided a settlement tank for settlement of solid contaminating materials from the used scrubbing water, for energy recovery.