Patent ID: 6325618
Filing Date: 2001-12-04
Classification: F23D

Abstract:
A fuel lance for spraying liquid and/or gaseous fuels into a combustion chamber, which fuel lance is part of a secondary or tertiary burner, around which a combustion air jet flows in a main flow direction, comprising: an outer lance shell, the shell having a shell opening, a liquid-fuel passage for supplying liquid fuel, a gas passage surrounding the liquid-fuel passage and intended for supplying gaseous fuel, and an air passage surrounding the gas passage and intended for supplying cooling or atomizing air, and first means for the radial spraying of the liquid fuel from the liquid-fuel passage into the combustion chamber, and second means for the radial spraying of the gaseous fuel from the gas passage into the combustion chamber, the first means having a first guide tube, which, in the radial direction starting from the liquid-fuel passage runs outward through the gas passage and the air passage, the second means having a second guide tube, which, in the radial direction starting from the gas passage, runs outward through the air passage and concentrically surrounds the first guide tube at a distance, the two guide tubes having discharge openings adjacent to the shell opening in the lance shell, the first guide tube being arranged to provide a jet of liquid fuel as discharged through the shell opening, the second guide tube being arranged to provide a jet of gaseous fuel as discharged through the shell opening and the air discharging from the air passage through the shell opening being arranged to provide a sheath of air around the jets of fuel.