Combustion chamber with a lean operation pre-orifice fuel injection system

The present application provides a combustor (100) for combusting a fuel stream (30) and an air stream (20). The combustion chamber (100) may comprise a plurality of fuel nozzles (120), a lean operation preliminary nozzles fuel injection system (270), which is placed in front of the fuel nozzles (120), and a Vormischring (250) between the fuel nozzle (120) and the lean operation is placed -Vordusen fuel injection system (270) to mix the fuel stream (30) and the air flow (20).