Determination method for root position of soft heat belt in blast furnace

Abstract

The invention relates to a determination method for root position of a soft heat belt in a blast furnace, which is characterized by connecting a gas collection pipeline and a dust removal purification system on net pressure holes installed at different heights of a blast furnace body, analyzing clean gas after dust removal filtering purification, analyzing the content of CO2 and CO of the clean gas, calculating CO2 / (CO2+CO) in the component of coal gas, solving a scale height position of CO2 / (CO2+CO)=0 in the blast furnace by utilizing an extrapolation calculating method, carrying out linear regression on the static pressure data of the furnace body with different scale heights, working out the functional relationship between the static pressure and the scale height of the blast furnace, comparing the functional relational expressions of the static pressures of the furnace body and the scale heights of the blast furnace in different operation conditions of the blast furnace, contrasting the functional relational expression with the scale height position of CO2 / (CO2+CO)=0 calculated with the component of the coal gas, and calculating the scale height of the root position of the soft heat belt in the blast furnace after function rectification. By the method of the invention, the position of the soft heat belt can be accurate in the range of 0.2-1.5m.

Description

technical field [0001] The invention belongs to the field of ironmaking blast furnaces, and in particular relates to a method for determining the position of the root of a blast furnace reflow zone. Background technique The shape and position of the refractory zone in the blast furnace are affected by the properties of the raw fuel used in the blast furnace on the one hand, and are closely related to the operating system of the blast furnace on the other hand. When blast furnaces use raw materials of different performance and quality, in order to ensure the smooth operation of the blast furnace and obtain better technical and economic indicators, the operating system must be adjusted accordingly to form the shape and position of the reflow zone that matches the performance and quality of the raw materials. Due to technical and financial constraints, most blast furnaces at home and abroad are not equipped with devices for detecting the shape and position of the soft fusion ...

AI Technical Summary

Problems solved by technology

Due to technical and financial constraints, most blast furnaces at home and abroad are not equipped with devices for detecting the shape and position of the soft fusion zone, especially in China, the detection technology for the shape and position of the blast furnace soft fusion zone is still very backward, and domestic blast furnaces are equipped with this detection device fewer blast furnaces

Japan's detection technology for the position and shape of the blast furnace soft fusion zone is at the international leading level. Through the vertical rigid probe and the inserted horizontal probe that descend with the furnace charge, the use of optical fiber camera, gas extraction, temperature measurement, sampling and computer processing technology can be used. Detected the shape and position of the soft fusion zone of the blast furnace, but the investment and cost of advanced technology and equipment used in it are also very expensive, and the technical blockade is also very strict

At present, blast furnace operators and managers generally refer to data such as stave heat load, stave wall temperature, brick lining temperature, upper and lower pressure differences of the blast furnace, and furnace throat gas cross temperature measurement for the judgment of the root position of the soft melt zone. Estimation of the approximate position of the softening zone is generally only accurate to a section of the stave with a height of 2-3m