A combustion device has poor fuel injection system upstream of the nozzles

The combustor (100) to burn a fuel stream and an air stream. The combustor (100) may comprise a number of nozzles (120) of fuel, an injection system (270) of lean fuel upstream of the nozzles, upstream of the nozzles (120) of fuel, and a volume annular pre-mix (250) disposed between the nozzles (120) and the fuel injection system (270) of lean fuel upstream of the nozzles, for premixing the fuel flow and the air flow.