| 摘要 |
PURPOSE:To blasting tuyere of the oxygen converter, which favorably realizes the protection for the tuyere with the protective gas, together with the resulting avoidance of damage of the furnace wall refractory, by installing the return path grooves for the protective gas in the outer surface of the outer tube of the tuyere for introducing the protective gas. CONSTITUTION:The above stated blasting tuyere 2 is installed in the furnace bottom refractory 1 of the bottom blasting converter. And in the tuyere 2, the supply paths 3 and 4 for the protective gas (HC gas, for instance) and the smelting gas are installed. Besides, in the outer surface of the outer tube 8 of the tuyere 2, many return path grooves 5 are formed circumferentially at uniform pitch; the supplied 3 protective gas is partly discharged out of the furnace passing through the grooves 5. In the illustration, 7 is the inner tube of the tuyere 2, 9 is the central path for the smelting gas and 10 is the peripheral path for the protective gas being formed between the inner tube 7 and the outer tube 8. In this constitution, by discharging a part of protective gas out of the furnace through the grooves 5, the inflow of the protective gas is preheated and the tuyere 2 is effectively cooled, and also, the temperature gradient in the outer tube 8 and the refractory 1 is lowered, and the damage of the refractory 1 is effectively prevented. |
