TUYERE STRUCTURE ROTATIONALLY LIFTABLE TO INITIAL STATE BY IMPROVING STRUCTURE OF TUYERE OF BLAST FURNACE AND MOUNTING TUYERE PUSHING MEANS ON OUTER METAL CASE

摘要

PURPOSE: To provide a rotary return type tuyere structure of blast furnace, the tuyere capable of being rotationally returned to the initial state without damage of tuyere and its components even when tuyere is rotationally descended after it is collided with semi-molten materials and the like dropping from the upper side. CONSTITUTION: In a tuyere structure supported in such a way that the outer side of a rear portion of tuyere is closely adhered to the inner side of a front portion of large tuyere, and the inner side of the rear portion of the tuyere is closely adhered to the outer side of a front portion of blow pipe, the rotary return type tuyere structure of a blast furnace is characterized in that tuyere is formed in such a way that a cross-sectional shape for an adhesion region of the large tuyere(20) and the tuyere(30) has circular arc shaped joint surfaces(22,32) that follow a circular course(P1), and the tuyere is formed in such a way that a cross-sectional shape for an adhesion region of the tuyere and the blow pipe(40) has joint surfaces(24,42) that follow a circular course(P2) having the same central point as a central point(C) of the circular course(P1), and a tuyere pushing means(50) is mounted on an outer metal case(14) composing the blast furnace to provide the tuyere with elastic force in a direction in which the tuyere is rotationally lifted.