Estimation method for blast furnace hearth refractory thickness

摘要

PURPOSE: A method for estimating thickness of bricks of the bottom of blast furnace is provided to extend life cycle of the blast furnace by estimating accurate thickness of the bottom of the blast furnace reflecting change of cooling conditions of the outer part of metal case, thereby effectively controlling bricks of the bottom of the blast furnace. CONSTITUTION: In a method for estimating thickness of bricks of the bottom of blast furnace from heat information measured by first thermocouple (TC1) and second thermocouple (TC2) respectively installed on carbon brick and metal case having the same height, the method for estimating thickness of bricks of the bottom of the blast furnace comprises a step of measuring flow of heat flux flown to the side of the metal case of the outside by change of flow of inner molten iron and temperature of molten iron from the first thermocouple; a step of measuring change of heat transfer characteristics according to temperature of cooling water sprayed from the outer part of the metal case, flow rate variation and number of operation years from the second thermocouple; and a step of calculating thickness of bricks of the bottom of the blast furnace from the measured values by using temperature difference between carbon bricks and metal case and heat conductivity and thickness of components of the bottom part of the blast furnace.