A maintenance method for the furnace bottom of a top-bottom combined blowing converter

Abstract

This application provides a maintenance method for the furnace bottom of the top-bottom combined blowing converter, blowing in low-pressure, low-flow nitrogen through the oxygen lance, replacing and discharging the heat of the furnace gas in the furnace in time, so that the small amount of slag left in the furnace can be quickly cooled After cooling and solidification, it adheres to the bottom of the furnace. After adding scrap steel or iron nuggets, the heat of the slag and the added scrap steel or iron nuggets further undergo heat exchange, which accelerates the cooling and solidification of the slag, thereby realizing rapid slag repairing of the furnace bottom and reaching the bottom of the furnace. The purpose of maintenance; this application does not require the transformation of equipment and processes, the steps are simple, practical, and low in cost. On the premise of ensuring the operation safety and maintenance effect, there is no need to invest in refractory materials such as furnace materials, and there is no longer sintering time If it is too long or too short, it will have adverse effects on furnace repair and molten steel pollution. It has the characteristics of fast maintenance, good furnace repair effect, little impact on molten steel quality, low maintenance cost, simple and practical, safe and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, in particular to a method for maintaining the furnace bottom of a top-bottom combined blowing converter. Background technique [0002] During the blowing process of the converter, extremely complex and intense physical and chemical reactions and mechanical movements are going on in the furnace. Due to various reasons such as mechanical erosion, high temperature, chemical erosion, peeling, etc., it is easy to cause damage and accelerated erosion of the converter lining. [0003] Due to the oxidation of the bottom blowing components, the long time of contact with high temperature molten steel, and the large temperature difference, the corrosion rate of the top and bottom combined blowing converter is relatively fast. The erosion of the furnace lining is more serious, resulting in accelerated erosion of the refractory material at the bottom of the furnace and a decrease in the height ...

AI Technical Summary

Problems solved by technology

This maintenance method must be operated when the converter is empty, and at the same time, sufficient sintering time must be ensured, which not only consumes a large amount of repair materials or magnesia carbon bricks, but also has the disadvantage of poor sintering and solidification effect of repair materials. Potential safety hazards and the fall-off of repair materials affect the quality of molten steel

In the above-mentioned traditional furnace bottom maintenance method, the quality of repairing materials or magnesia carbon bricks directly affects the maintenance effect of the furnace bottom. At the same time, the sintering time is not enough, which will easily cause the repairing materials to peel off and pollute the molten steel, and there are great safety hazards. At the same time, there are more or less partial corrosion and peeling of the repair charge, which enters the molten steel and affects the quality of the molten steel.