Method and device for introducing a liquid or gaseous treatment medium into a flue gas flow

In a method for introducing a liquid or a gaseous treatment medium into a flue gas, stream wherein a total adjustment value for control of a feeding of an active substance of the treatment medium is generated by an actual value measurement of a flue gas component and a comparison with a set value, and the treatment medium is injected through a plurality of nozzles into the flue gas stream flowing through a flow chamber (10), the improvement comprising:

• dividing the flow chamber (10) into a three-dimensional matrix of partial flow chambers (1.1.1 . . . 2.3.3), each of said partial flow chambers having a nozzle (3.1.1 . . . 4.3.3) and measuring means (5.1 . . . 6.3) for detecting at least a temperature and a flow speed in said partial flow chamber (1.1.1 . . . 2.3.3), continuously calculating an individual partial adjustment value for the active substance for each individual nozzle (3.1.1 . . . 4.3.3), and injecting said active substance with a constant volume flow of treatment medium, whereby a total of the individual partial adjustment values does not exceed a total adjustment value of the active substance, and the nozzles (3.1.1 . . . 4.3.3.) having a partial adjustment value of zero are not activated, so that in each column of the matrix, injection occurs only in a single partial flow chamber (1.1.1 . . . 2.3.3).