Combustor head end assembly with double pressure premixing nozzle

摘要

Problem to be solved: to provide a head end assembly for a combustor of a gas turbine system including a fuel nozzle for mixing fuel with air of two different pressures.The combustor may include a combustor liner and a flow sleeve.The high pressure air cools the outer surface of the combustor liner through the opening in the flow sleeve and produces low pressure air within the annulus between the combustor liner and the flow sleeve.The first fuel nozzle is positioned in the primary combustion zone and the second fuel nozzle is positioned in the secondary combustion zone of the liner.The fuel nozzle generates a premix of high pressure air and fuel, generates a mixture of premix and low pressure air, and then introduces the mixture into each primary or secondary combustion zone of the combustor.The combustor provides improved fuel premixing, is flexible to fuel, and reduces pressure drop requirements.Combustor can be used in can, annular, or segmented annular combustor assemblies.Diagram