An automatic control method for blowing argon at the bottom of converter ladle

Abstract

The invention discloses an automatic control method for ladle bottom argon blowing of a converter and belongs to the technical field of automatic steelmaking. The method comprises the following steps: (1) establishing a database for storing steel grade argon blowing tables and ladle life correction tables; (2) selecting the specific steel grade argon blowing table according to the smelting steel grade trademark, obtaining the pressure correction value and the flow rate correction value from the ladle life correction tables according to the actual ladle life of the steel ladle and generating the argon blowing pressure, the argon blowing flow rate, the switching time and other information of an actuating argon blowing table; (3) controlling automatic opening and closing of an argon gas cut-off valve and automatic adjustment of both an argon blowing pressure regulating valve and an argon blowing flow control valve according to the argon blowing pressure, the argon blowing flow rate and the switching time in the actuating argon blowing table, as well as the steel tapping clock; (4) repeating the step (2) and the step (3) to complete automatic control of ladle bottom argon blowing of molten steel in multiple converters. The automatic control method provided by the invention can realize full-automatic control of ladle bottom argon blowing of a converter, relieve the labor intensity for operators, regulate the bottom argon blowing operation and improve the quality of argon gas mixed molten steel.

Description

technical field [0001] The technical field of steelmaking converter automation, in particular, relates to an automatic control method for argon blowing at the bottom of a steelmaking converter ladle. Background technique [0002] After the molten steel is smelted in the steelmaking converter, it is poured into the ladle through the outlet of the converter, and various alloys are added to the molten steel, and an inert gas is blown into the molten steel through the porous permeable brick at the bottom of the ladle—argon gas to stir the molten steel To adjust and even the composition of molten steel, and accelerate the floating of inclusions in molten steel. The argon blowing system at the bottom of the converter ladle is a steelmaking process system set up for uniform molten steel composition to complete the task of stirring molten steel. [0003] At present, domestic steel mills generally adopt the process of argon pressure regulating valve-argon flow regulating valve-argon...

AI Technical Summary

Problems solved by technology

[0005] 1. For the same steel type, different operators have different timings for argon blowing pressure setting, argon blowing flow setting, and argon blowing pressure and flow setting value switching due to different personal operating experiences. It is difficult to standardize the argon blowing operation at the bottom of the ladle

[0006] 2. Although the semi-automatic operation mode of the existing ladle bottom argon blowing control system can realize the precise and automatic adjustment of argon blowing pressure and argon blowing flow rate, the operator still needs to touch the mouse and keyboard many times during the tapping process of a furnace of molten steel Perform operations such as opening the argon shut-off valve, setting and adjusting the argon blowing pressure and argon blowing flow set value, closing the argon shut-off valve, etc.; and usually the argon blowing operator also has to take into account the operational tasks of ladle alloy weighing and feeding. very labor intensive

Due to many and complicated operations, the argon blowing pressure and flow setting are wrong, which affects the stirring effect of molten steel and the accidents that affect the quality of tapping occur from time to time.

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