BURNER UNIT FOR GAS TURBINE COMBUSTOR

PROBLEM TO BE SOLVED: To avoid the burning or choking of jet orifices by preventing the backflow of fuel gas to the fuel jet orifices of a pilot burner. SOLUTION: A burner unit combusting fuel mixing with high-pressure air from the compressor of a gas turbine is provided with a premixing burner introducing premixed high-pressure air and fuel into the burner, and a pilot burner 25 for feeding the fuel into the burner for performing diffusion combustion. Air jet orifices 33b jetting the high-pressure air are communicated with the fuel jet orifices 33a at the end of the pilot burner 25. As the high-pressure air is jetted from the air jet orifices 33b into the fuel jet orifices 33a at the end of the pilot burner 25 in a low NOx operation where the flow rate of the fuel jet from the pilot burner 25 is small, the backflow of combustion gas to the fuel jet orifices 33a of the pilot burner 25 can be prevented and the burning and choking of the fuel jet orifices 33a can be avoided.