| 摘要 |
PROBLEM TO BE SOLVED: To prevent the stickiness of an ash component drerived from pulverized fine coal to a refractory ring fitted on the inner surface of a tuyere and the tip part of a lance by adjusting the fitting position of the lances in a pulverized fine coal injection blast furnace provided with a plurality of injection lances. SOLUTION: The fitting positions of the plurality of lances whose tip parts are projectingly arranged in the tuyere hole fitted with the refractory ring 4 in the inner part, in the blast furnace, and adjusted so that the interval of mutual tip parts of the lances is >=250 mm in the longitudinal range of the ring and both tip parts of the lances are away at the distance satisfying the following inequality from the inner peripheral surface of the ring. X>=L.tanθ. Wherein, X is the shortest distance from the axial center of the lance tip part to the inner peripheral surface of the ring, L is the distance from the tuyere tip part to the lance tip part andθis the widening angle of the pulverized fine coal injected from the lance 3. Therefore even if the refractory ring 4 is used in the pulverized fine coal injection blast furnace, such long service life is obtd. in this tuyere as to equal to the case which does not execute the injection of the pulverized fine coal and such problem as the clogging of the pulverized fine coal in the lance 3 caused by the stickiness of the ash content, can be dissolved.
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