| 摘要 |
FIELD: ferrous metallurgy, in particular, supplying of hot blast and additional fuel into blast furnace. SUBSTANCE: blast tuyere has flange, conical sleeve, front part, water and additional fuel branch pipes, cylindrical blasting channel in front part with diameter d equal to tuyere diameter and depth equal to 0.2-0.5d. Cylindrical portion in front part and inner surface of inner sleeve are covered with layer of heat-insulating refractory lining made in the form of cylindrical tube with outer diameter equal to inner diameter of tuyere flange and inner diameter equal to that of cylindrical blasting channel in front part. Lining layer is provided with opening for introducing additional fuel into blasting process and is covered at blasting side with layer of chromo-phosphate alumina binder. EFFECT: increased efficiency by reduced hot blast heat losses and enhanced reliability in operation. 4 cl, 1 dwg
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