Patent ID: 7387662
Filing Date: 2008-06-17
Classification: B01D,B01F

Abstract:
1. A method of separating gaseous pollutants, such as sulphur dioxide, from hot process gases, such as flue gases, in which method the process gases are passed through a contact reactor ( 22 ; 322 ), in which a particulate absorbent material reactive with the gaseous pollutants is introduced in a moistened state into the process gases in order to convert the gaseous pollutants into separable dust, after which the process gases are passed through a dust separator ( 10 ), in which dust is separated from the process gases and from which the cleaned process gases are discharged, characterised in that a circulating part of the dust separated in the dust separator ( the cooled dust is mixed in a second step with a gas containing water vapour, said gas having a saturation temperature that is higher than the temperature of the cooled dust, and the dust moistened by condensation of the water vapour is introduced as absorbent material into the contact reactor (