Abstract: In a method for operating a corner burner of a tangential burner system, at least a first air stream of coal dust and primary air is tangentially introduced to a imaginary horizontal circle in the combustion chamber of the tangential burner system via a nozzle of the corner burner. An additional air stream is introduced into the combustion chamber in a direction toward a chamber wall of the combustion chamber at an adjustable offset angle relative to the first air stream. The offset angle can be adjusted by providing the additional air stream as mixed air stream of at least two partial air streams of different adjustable flow velocity. A first partial air stream within the nozzle flows straight into the outlet opening of the nozzle, and the second partial air stream flows angularly into the first partial air stream upstream of the outlet opening. The nozzle has a mixing chamber arranged upstream of the outlet opening.