VERFAHREN UND VORRICHTUNG ZUM BEHEIZEN EINES METALLURGISCHEN OFENS

摘要

Described is a process for heating a metallurgical furnace, in particular an arc furnace charged with scrap metal or a similar solid material. Oxygen and fuel are fed in through the furnace wall by at least one burner located above the melt, the fuel being supplied in a carrier-gas stream which completely surrounds the oxygen feed line. The process is particularly cost-effective owing to the fact that 4-15 kg/t of coal dust of particle size <200 mu m in an inert-to-slightly reducing carrier gas is used as the fuel, being fed in at a speed of at least 45 m/s, at least while the charge is melting, and being burnt in a diffuse flame in stoichiometric to slightly greater than stoichiometric proportions in oxygen emerging from the burner at about the speed of sound and at a pressure of at least about 1 bar. Also described is a burner particularly suitable for use in this process.