FIELD: heating.
SUBSTANCE: in method in side wall (201, 301) of industrial furnace (200; 300) there is at least one tuyere (206, 306). Inside furnace (200; 300) through tuyere (206, 306) second oxidiser is supplied with oxygen content of at least 85 wt% with sound speed or higher in form of a jet (207; 307) of second oxidiser. Method provides flow of jet (207; 307) of second oxidiser in horizontal plane over material (202, 302), between and substantially parallel to two consecutive rows (205a, 205b; 305a, 305b) of arched burners (203, 303). Amount of second oxidiser supplied in unit time is balanced so that oxygen fed by means of second oxidiser makes up at least 50 wt% of total oxygen supplied per unit time in furnace (200; 300).
EFFECT: providing uniform heating of material.
11 cl, 5 dwg
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