Apparatus for the premixed gas phase combustion of liquid fuels

A combustion apparatus comprising, in combination, outer, intermediate and inner casings disposed such that combustion air flows from a passage formed between said outer and intermediate casings into a passage formed by said intermediate and inner casings, air supply means, liquid fuel supply means, a combustion duct which expands to produce a region of recirculating hot gases, fuel gassification tube disposed within said region of recirculating hot gases so as to utilize heat liberated by combustion to accomplish liquid fuel gassification, a plurality of fuel/air premixing tubes, a plenum chamber which receives gassified fuel from said fuel gassification tubes and distributes said gassified fuel to orifices in said fuel/air premixing tubes, regenerative heat exchange means located between said combustion duct and said intermediate casing to preheat the combustion air stream, means to vary the position of the assembly comprised of said plenum chamber and said fuel/air premixing tubes, ignition means, means to allow a portion of the combustion air to bypass the regenerative heat exchange section, and means to supply gaseous fuel into said plenum chamber to start the process.