Automatic control method for double slag operation of converter

Abstract

The invention relates to an automatic control method for the double slag operation of a converter, which belongs to the technical field of the converter steelmaking. The automatic control method comprises the step of based on a secondary automatic control system, when the content of Si in the molten iron feeding into the converter is higher than 0.60 percent, establishing an independent operation mode in the secondary automatic control system as follows: setting a target parameter of the prophase deslagging of the converter that when a calculating temperature reaches 1,300 to 1,350 DEG C, the operation of automatically lifting the blow gun to stop blowing is carried out; setting the control gun position in the whole process in the secondary automatic control system as low-high-low; setting the process oxygen flow between 300 and 310Nm3 / min; setting the increased oxygen flow in the final stage to between 340 and 350Nm3 / min so as to increase the stirring effect; and setting 30 to 40 percent of the total amount of the slagging materials which are put in the previous stage in a secondary model, wherein the residual slag materials are put when the secondary slagging starts. The invention has the advantages of making the endpoint control accurate, improving the automation control level of the converter and realizing the automation control that the converter utilizes the high Si molten iron to produce the low P molten steel.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and in particular provides an automatic control method for double slag operation of a converter. Background technique [0002] Due to the small furnace volume ratio of small and medium-sized converters, once the molten iron condition fluctuates, the blowing process of the converter is difficult to control, slag overflow, splashing and other phenomena are prone to occur, and the end point is difficult to control. For this reason, small and medium-sized converters often need to be smelted through the operation method of double slag, that is, the slag is poured once in the early stage of blowing, and part of the high Si and high P slag is poured out before the slag is smelted. [0003] In addition, with the development of converter control models, converter smelting has gradually shifted from artificial experience control to mathematical model control, and the smelting mode of automati...

AI Technical Summary

Problems solved by technology

However, the double slag operation will bring difficulties to realize the automatic control of the model due to the interruption of blowing and one-time slag dumping.