| 摘要 |
PROBLEM TO BE SOLVED: To provide a tuyere ring and a blast furnace tuyere with the tuyere ring installed therein which contribute to an increase in injection quantity of fine powdery coal and to formation of a stable raceway having depth and spread by optionally setting the blasting angle of hot-blast although an ordinary tuyere with the tuyere ring installed therein is used and a Laval tuyere is not used. SOLUTION: The cylindrical tuyere ring 2b installed inside the blast furnace tuyere 1 is used, the cylindrical tuyere ring 2b being characterized in that at a part of the tuyere ring, the thickness of the tuyere ring is continuously changed so that the thickness of the tuyere ring reduces in an axial direction, and at a part opposite to the above part of the tuyere ring in a circumferential direction, the thickness of the tuyere ring is continuously changed so that the thickness of the tuyere ring increases in the axial direction. The blast furnace tuyere with the tuyere ring installed therein is characterized in that the above tuyere ring 2b is installed in the tuyere 1 in such a way that the upper part of the tuyere ring becomes thinner toward a blast-inlet side and becomes thicker toward a blast-outlet side, and the lower part becomes thicker toward the blast-inlet side and becomes thinner toward the blast-outlet side. COPYRIGHT: (C)2009,JPO&INPIT |
