Method for improving blast furnace hearth cooling efficiency

Abstract

The invention discloses a method for improving blast furnace hearth cooling efficiency. The method comprises the following steps: dividing the periphery of a blast furnace into (iend+1) symmetrical vertical section areas, calculating the hearth temperature changes and temperature gradients of 2*(iend+1) points in the periphery of the blast furnace; carrying out grading evaluation on the hearth, wherein the temperatures can be divided into three grades: abnormally high temperature, abnormally low temperature, and normal temperature; finally calculating the occurrence numbers of the three situations and the ratios of the points with three temperature grades in all points, and re-adjusting the flow distribution of hearth cooling water according to weight coefficients sigma H, sigma M, and sigma L. According to the corrosion situation in hearth, the cooling water distribution in hearth can be dynamically adjusted to strength the cooling effect in heavy corrosion areas, at the same time, the cooling water consumption is reduced, the cooling performance of the blast furnace cooling system is improved, and the blast furnace heart is prevented from being burnt through.

Description

technical field [0001] The invention relates to a blast furnace cooling technology, in particular to a method for improving the cooling capacity and cooling efficiency of a modern large blast furnace hearth. Background technique [0002] In recent years, the safety of blast furnace hearth has attracted the attention of metallurgical systems at home and abroad again. In view of the many accidents of blast furnace hearth burn-through at home and abroad, which have seriously affected production and caused huge economic losses, blast furnace workers have paid attention to the hearth. Longevity issues are of great concern. A comprehensive analysis of the causes of accidents shows that unreasonable design of the hearth cooling system or low cooling efficiency has become one of the main causes of blast furnace hearth accidents. [0003] At present, a certain proportion of blast furnace cooling systems at home and abroad adopt segmental cooling, which are two sets of furnace bottom...

AI Technical Summary

Problems solved by technology

However, with the continuous improvement of the blast furnace smelting intensity and coal ratio, the temperature fluctuation range of the blast furnace lining increases from 50°C / min to 150°C / min, and the average heat flow intensity in the lower part of the furnace body, furnace waist and bosh area is 30~ Within the range of 60KW / ㎡, it reaches 160KW / ㎡ at high temperature, and reaches 240KW / ㎡ when the furnace condition is abnormal. The demand for blast furnace cooling system in various cooling parts is also quietly changing, especially the blast furnace hearth within a 360-degree circumference range. The erosion conditions in all directions are different, so the original cooling method for the furnace hearth is obviously unable to meet the requirements of the 15-20-year service life of modern blast furnaces

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