Method for lighting fire and apparatus for carrying out said process

In a closed fire fighting method, the reaction of ammonia with ambient air produces an extinguishing gas mixture consisting of nitrogen and water vapor, which is supplied to the source of the fire. The extinguishing gas is produced in a device whose structure substantially corresponds to that of a small gas turbine and in which ammonia is used as the fuel. Due to the additional injection of water into the combustion chamber of this device and in a mixing chamber downstream of the turbine, the temperature of the thus generated quenching gas is controlled.