Patent ID: 6938561

Claim:
A device for producing a rotating flow in a rectangular flow duct which comprises a flue-gas outlet of an incineration plant, comprising: a flow duct having four walls in opposing wall pairs and a transition region from a combustion chamber of the incineration plant to the flue-gas outlet; a plurality of nozzles for media which can be emitted as a jet, the nozzles being arranged in an injection plane on two opposite walls defining the flow duct and having a wall width b, the nozzles including first nozzles oriented in a row in each case in at least one first wall section of the two opposite walls so that the first nozzles inject a jet into the injection plane wherein the injected jet and the wall form an angle γ lying in the injection plane, the angle γ being at least approximately 90°, a sum L of lengths l of the first wall sections being at least approximately 0.4b<L<0.8b, and the at least one first wall section of the one wall being diagonally opposite the at least one first wall section of the opposite wall; and second nozzles arranged in each case in the injection plane in at least one second wall section of the two opposite walls so that for an angle β lying in the injection plane between the jets injected from the first and the second nozzles |β|>0°, each of the two opposite walls having at least two first wall sections so as to produce at least two vortices rotating in opposite directions, each of the two opposite walls additionally having two second wall sections, in each case a first wall section and a second wall section of the one wall forming a vortex region with the directly opposite second wall section and first wall section respectively of the opposite wall, the jets injected by the second nozzles being inclined toward the jets injected by the first nozzles by +|β| in a first vortex region and by −|β| in a second vortex region.