CONTROLLING METHOD FOR COOLING WATER IN BLOWING OUT STAGE OF BLAST FURNACE

摘要

PURPOSE:To prevent the deterioration of refractory materials in the bottom part of a blast furnace by excessive spraying of water in the stage of cooling the blast furnace by water spraying for the purpose of blowing-out at the intermediate relining by measuring the volume of the water gas produced in tuyere parts and the concn. of the components thereof and controlling the rate of the water spraying in accordance with the measured values thereof. CONSTITUTION:In the stage of blowing-out in the case of intermediate relining of blast furnace or the like, the blast furnace is blown out at the point of the time when the top part 2 of coke layers 1 by the work for substituting the coke lowers down to the belly area (b) of the blast furnace. In cooling the furnace by spraying water from the furnace top, a sonde B is disposed in the core part E and a sonde D in the wall part in the tuyere part C and the cooling water is sprayed until the water comes near the point 7 where the skirt part 5 of the surface of the layers 1 and the inside wall surface 6 of the furnace contact. The volume of the water gas produced in this time and the concn. of the components thereof are quickly analyzed with a gas analyzer 3 through the sondes B, D, and from the concns. of the CO, H2 and CO2 in the gases, the correct rate of water spraying is judged and the cooling water is sprayed under the controlled rate.