Full-quantity molten iron converter smelting control method

Abstract

The invention relates to the technical field of converter steelmaking, in particular to a full-quantity molten iron converter smelting control method. The method specifically comprises the following steps of carrying out deslagging operation, carrying out calculation of the total amount of ore and the total amount of molten iron, carrying out iron converting control, carrying out oxygen supply control, carrying out slagging control, carrying out temperature control and carrying out end point control. According to the control method, splashing in the whole-iron smelting process is avoided, thenvarious defects such as environmental pollution and metal material loss caused by splashing can be avoided, and the smooth smelting process is realized; and the end point carbon temperature hit rateof whole-iron smelting is improved, various hazards caused by end point high-temperature overoxidation are avoided, the quality is ensured, and the important significance in an iron and steel plant isachieved.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, in particular to a method for controlling full-volume molten iron converter smelting. Background technique [0002] The main metal materials for converter smelting are molten iron and scrap steel. The scrap steel not only provides metal materials, but also plays a cooling role to balance the excess heat of the melting pool. However, under the following special circumstances in production, only the full amount of molten iron can be used for smelting. First, the temperature of the molten iron is very low and the heat is insufficient, so scrap steel cannot be added; quality and other workmanship needs. [0003] Full-volume molten iron smelting is an unconventional operation compared to the operation of molten iron plus scrap steel. The heat balance and dynamics change, and the production operation is difficult. The main manifestations are: First, the change law of the temperature of t...

AI Technical Summary

Problems solved by technology

However, under the following special circumstances in production, only the full amount of molten iron can be used for smelting. First, the temperature of the molten iron is very low and the heat is insufficient, so scrap steel cannot be added; Quality and other process needs

[0003] Full-volume molten iron smelting is an unconventional operation compared to the operation of molten iron plus scrap steel. The heat balance and dynamics change, and the production operation is difficult. The main manifestations are: First, the change law of the temperature of the molten pool is different from that of conventional smelting. Since there is no melting of scrap steel to absorb heat , the temperature rise rate of the molten pool during the whole smelting process is very fast; secondly, the power conditions are different. When the full amount of molten iron is smelted, there is no scrap steel in the converter molten pool, and the molten metal flows inside. The mixing time is obviously shorter than that of conventional operation, which speeds up the reaction rate. 3. Due to the fast heating and strong stirring effect, the carbon-oxygen reaction speed is fast, and explosive splashing is easy to occur. At the same time, the oxygen utilization rate is high, the smelting time is short, and the process test timing and end point control are difficult to grasp.

At present, frequent splashing occurs during the smelting process of full-volume molten iron, and the high-temperature peroxidation at the end point is serious, which not only affects the quality of molten steel, but also easily causes accidents