WATER-COOLED SLAG RUNNER

PROBLEM TO BE SOLVED: To provide a slag runner small in heat deformation and high in safety by providing a metal main member at the bottom of a slag runner, except for its center portion, which is obtained by placing a metal main member located in a recessed portion of a casting bed of a blast furnace and having a flowing portion of a cooling medium as a side wall part and lining the inner peripheral portion of the side wall part with a runner material, and providing a refractory at the center portion. SOLUTION: A refractory 4 such as a quartzite brick is provided in a space (for example, 1/3 of the width of the runner bottom) of a center portion of a runner bottom between L-shaped metal main member 2a, 2b, and an inner peripheral part is lined with a runner material 3 to form a slag runner. Slag adhesion is generated on a side wall portion of the runner material and a corner portion of the runner bottom by passing water on a back side of the metal main members 2a, 2b, the runner material is prevented from being damaged by the self-lining effect, and the service life of the runner is increased by cooling the refractory provided on the center portion of the runner. The wear condition of the whole runner is controlled by the relation to a heat load by a thermometer 13 embedded in the metal main members 2a, 2b, and reduction in thickness of the slag runner is detected by monitoring the wear condition of the refractory layer of the slag runner to prevent steam explosion in advance.