FUEL INJECTOR LANCE

A fuel injector lance, particularly for transporting and guaranteeing stable gaseous fuel delivery to combustion systems is designed to deliver gaseous fuel to the combustion process, where the fuel mass flow rate is controlled by the amount of motive gas delivered to the injector. Characterized in that it comprises: a mixer chamber (3) for mixing motive gas and fuel gas, to which motive gas is injected through injector nozzles (4) located peripherally on the mixing chamber at an adequate angle to the longitudinal axis of the fuel injector lance. The mixing chamber is connected via a convergent channel (2) with a cylindrical supply pipe (1), and a channel with an increasing cross section (5) with the delivery pipe (8) ending with an outlet nozzle (9). The mixing chamber, convergent channel and divergent channel have an outer jacket, between which a motive gas pressure chamber (6) is found with a motive gas connecting pipe (7). The fuel injector lance can operate in a wide range of temperatures and is resistant to changes in pressure in the combustion chamber, fuel gas pressure as well as physicochemical properties of gaseous fuel. Air at ambient temperature, or heated air and inert gases of different temperature, can be used as the as a motive force. The fuel injector lance is mounted in combustion systems in which the gaseous fuel pressure is not high enough to overcome the flow resistances in the combustion system, and to ensure adequate motive gas injection parameters for the proper combustion process.