Converter tapping hole sliding gate slag-stopping process

Abstract

The invention discloses a converter tapping hole sliding gate slag-stopping process. The process comprises the following steps that: (1) a hydraulic station is started when a tapping start signal is received; (2) the converter starts to tilt, and a tilting angle signal is sent to a PLC on a real-time basis, and when the converter tilting angle reaches a first critical value, the PLC controls the close of a slag-stopping gate valve; (3) when the converter tilting angle reaches a second critical value, the PLC controls the opening of the slag-stopping gate valve; (4) when tapping molten steel is close to the end and slagging begins, the PLC immediately controls close of the slag-stopping gate valve if the following conditions are satisfied simultaneously: a. the PLC detects a slagging signal sent by an infrared slagging detection system aligning at the tapping molten steel to the PLC; b. the converter tilting angle is no less than 85DEG; and c. the tapping time is no less than 3min; (5) after tapping, the converter is reset, and when the PLC detects that the converter is returned to the starting position, the PLC controls opening of the slag-stopping gate valve; and (6) hydraulic station is closed.

Description

Technical field [0001] The invention relates to a process for controlling a metal liquid outlet, in particular to a slag blocking process for a steel tapping nozzle. Background technique [0002] In the converter steelmaking process, when the molten steel is tapped after smelting, the molten steel is discharged into the ladle through the converter tap hole. The converter slag floats on the surface of the molten steel because its specific gravity is smaller than that of molten steel. Therefore, during tapping, the converter slag will slag into the ladle before the molten steel through the tap; in addition, when the molten steel is nearing the end, if it is not closed in time At the tapping port, the converter slag will also drop into the ladle from the tapping port. Since the converter slag has high oxidizing properties and contains a large amount of harmful substances, the converter slag coming out of the ladle not only affects the quality of molten steel, but also increases the...

AI Technical Summary

Problems solved by technology

[0008] (1) These methods all can't control the converter slag in the ladle earlier than the molten steel through the tap hole when tapping;

[0009] (2) The degree of automation of these methods is low, and cannot be associated with the existing automatic slag detection system, so it is impossible to effectively judge slag and stop slag when the molten steel is nearing the end;

[0010] (3) The slag blocking success rate of these methods is not high, and the slag blocking effect cannot fully meet the requirements of the steelmaking process

[0016] However, none of the above-mentioned patent documents related to the sliding nozzle slag blocking process technology related to the converter sliding nozzle slag blocking related technology and control technology

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