Diversion steam line

The mixing unit (1) has a tubular passage section (2), at which a mixing section (4) is aerodynamically coupled, where the mixing section has multiple convergent-divergent nozzles (5a,5b,5c), through which a flow medium (3) is flowed. The injection channels (6) are formed in the convergent-divergent nozzles, through which the cooling medium flows such that a mixing of the flow medium with the cooling medium takes place. The mutually adjacent convergent-divergent nozzles are arranged to each other in the flow direction (8) of the flow medium.