SYSTEM OF LEAKTIGHT CONNECTION BETWEEN A TUYERE AND A HOT BLAST INLET NOZZLE FOR A SHAFT FURNACE, AND STEEL-MAKING BLAST FURNACE COMPRISING SUCH A SYSTEM

摘要

A sealed connection system between a tuyere (4) of a shaft furnace, such as a steelmaking blast furnace, and an air blast pipe (3), in which a tip of the blast pipe is pressed towards a rear end of the tuyere, being centered thereon while still retaining freedom of pivoting movement relative thereto, characterized in that the system comprises an added annular blast pipe seat (5), placed between the tip (33) of the blast pipe and tuyere (4) and immobile relative to the tuyere, the blast pipe tip resting against a rear face (55, 55') of the seat and an immobile gasket (53) being placed between the seat and the tuyere such that the seat rests in sealed manner against a rear face (44) of the tuyere, and a sleeve (8), arranged around a contact zone between the blast pipe tip and the seat, one end of which is attached in sealed manner to the seat, another end being attached in sealed manner to the blast pipe.