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    • 10. 发明专利
    • PROTECTING METHOD OF BOTTOM BLOWING DOUBLE-PLY PIPE TUYERE
    • JPS57174410A
    • 1982-10-27
    • JP5783481
    • 1981-04-18
    • NIPPON STEEL CORP
    • MURAKAMI SHIYOUZOUSHINKAI AKIOEIRAKU MASUODOI AKIHIRONISHINO YASUSHI
    • C21C5/48
    • PURPOSE:To prevent solute of a tuyere due to falling-off of tuyere brick by its spalling phenomenon, by providing a refractory body layer between the outer pipe of a double-ply pipe and its outside tuyere brick, in a converter provided with a bottom blowing tuyere of the double-ply pipe. CONSTITUTION:Oxygen, air, gaseous Co2, etc. for blow-refining, and gaseous Ar, N, etc. for stirring are led in from an inner pipe 1 of a double-ply pipe tuyere provided on the furnace bottom in a converter for upper bottom blowing and bottom blowing, and kerosene, propane, natual gas, etc. are blown in from between an outer pipe 2 and the inner pipe 1. In this case, tuyere brick 3 of the outside of the outer pipe 2 is heated to a high temperature by heat conduction from the tuyere in case of blow-refining, receives a large temperature gradient due to a temperature drop in case of an empty furnace, is cracked due to spalling, and falls off. In order to prevent this phenomenon, a refractory body layer 4 having 5-40mm. thickness is provided between the outer pipe 2 and the tuyere brick 3, by which heat conduction from the tuyere in case of blow-refining is reduced, the temperature gradient is reduced, and generation of a crank due to spalling is prevented.