PULVERIZED COAL INJECTION LANCE AND PULVERIZED COAL INJECTION METHOD USING THE SAME

摘要

PURPOSE: A pulverized coal injection lance and a pulverized coal injection method using the same are provided improve combustibility when injecting pulverized coal used as a subsidiary raw material in the ion making process. CONSTITUTION: In a lance installed at a blow pipe so as to inject pulverized coal into a blast furnace, the pulverized coal injection lance comprises a hollow inner tube(102) into which the pulverized coal is supplied; a hollow outer tube(101) assembled onto the outer part of the inner tube(102); a hollow outer auxiliary tube(103) which is removably assembled into the front of the outer tube(101) having a shorter length than the inner tube(102); and a circular ring shaped projected rise(104) which is projected on the inner circumferential surface of the outer auxiliary tube(103) so as to smoothly mix oxygen supplied from the inside of the outer auxiliary tube(103) to a space between the outer and inner tubes(101,102) with pulverized coal supplied into the inner tube(102).