JPS56136906A - Blast furnace operating method - Google Patents

Abstract

PURPOSE:To control furnace walls to proper thickness by obtaining the melt zone levels near the furnace wall with a melt zone shape model in the radial direction by the use of gas sampler data in furnace upper part radial direction and estimating wall thickness from the relations between the melt zone levels near the furnace wall and actual furnace wall temperatures. CONSTITUTION:Melt zone levels 6 in he various positions in the radial direction are obtained with a melt zone shape model from various blast furnace operation details such as the temperatures and components of the gas measured in various measurement positions in the in-furnace radial direction of the gas samplers 3, 4 in furnace upper part radial direction installed in the upper part of the blast furnace shaft, as well as the amount and components of the gas blasted through tuyeres 2, and the components of charged coke and ores. The reference furnace wall temp. by these and the actually measured furnace wall temp. are compared, and the wall thickness is estimated. Based on this, the flow of the gas in the in-furnace radial direction is changed by performing the sectional mean action by ore amount/coke amount, blast flow rate, heavy oil amount, etc., or the distribution adjustment of the charging materials with a movable armor or the like, whereby the melt zone level 6 near the furnace wall and the gas temp. near the furnace wall are changed and the wall thickness is maintained constant.