Fuel lance for liquid and/or gaseous fuels and method for operation thereof

摘要

A fuel lance for liquid and/or gaseous fuels for use in a combustion chamber includes a liquid fuel pipe extending along a lance center line and defining a liquid fuel passage, a gas pipe surrounding the liquid fuel pipe and forming therebetween a gas passage, and a lance outer shell surrounding the gas pipe and forming an air passage around the gas pipe for cooling air and atomizer air. At least one air/fuel nozzle is provided in a peripheral side of the lance outer shell at a downstream end of the fuel lance for air flow out of the air passage into the combustion chamber. At least one gas nozzle is provided in the gas pipe for gas flow out of the gas passage into the air passage, the gas nozzle is positioned relative to the air/fuel nozzle so that gas from the gas nozzle flows with air from the air passage through the at least one air/fuel nozzle into the combustion chamber. At least one liquid fuel nozzle is provided in the liquid fuel pipe for liquid fuel flow out of the liquid fuel passage, the liquid fuel nozzle being positioned relative to the gas nozzle and air/fuel nozzle so that liquid fuel from the liquid fuel nozzle flows through the air passage and, with the air, through the air/fuel nozzle into the combustion chamber.