An improved burner of easily adjustable flame length for use in rotary kilns, comprising an inner concentric tube (8) an outer concentric tube (9) and an outer nozzle (11) detachably fitted at the tip (16) of the outer tube, and an inner nozzle (11A) fitted detachably at the tip (16A) of the inner tube, characterised in that (a) the burner (7) is provided with a know emulsifier (1), as herein described, for primary atomisation of fuel oils supplied thereinto at a pressure of 3-7 kg/cm2 through a pipe (2) fitted with a non-return valve (2A), a control valve (2B), a pressure guage (2C), with steam or compressed air supplie thereinto at a pressure of 1.5-5.0 kg/cm2 through a pipe (3) fitted with a non-return valve (3A), a control valve (3B) and a pressure gauge (3C), and for supplying the emulsion of fuel oils and steam or compressed air produced therein into the annular space between the inner and outer tubes of the burner at the bacl end (10) thereof through a known metallic flexible hose (5); (b) the burner is provided with a known metallic flexible hose ( fitted with, a control valve (6A) and a pressure guage (6B) for supplying a separate stream of steam or compressed air at a pressure of 1.5-5.0 kg/cm2 into the inner tube of the burner at the back end (10) thereof; and (c) an atomiser (12) in the form of a solid cone is fitted with its wider end adjacent to the tip (15) of the outer nozzle and narrower end adjacent to the tip (1: of the inner nozzle for secondary atomisation of fuel oils in the said emulsion with the said separate stream of steam or compresse air flowing respectively through the annular space between the inner and outer tubes, and inner tube of the burner, and emerging at the tip of the outer nozzle through a set of inner holes (13) and a set of outer holes (14) provided adjacent to the periphery of the narrower end of the atomiser.

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