A kind of rh refining control method and device

Abstract

The invention discloses an RH refining control method and device. The RH refining control method comprises the steps that after the condition that molten steel reaches an RH station is monitored, a steel ladle is controlled to be lifted, and thus the depths of the molten steel soaking a rising soaking pipe and a falling soaking pipe reach preset depths; the carbon content and the initial oxygen content of the molten steel are obtained, a target decarburization mode is determined, and then parameter values of respective gun positions, oxygen blowing flow quantities and oxygen blowing times of an RH main gun and an RH auxiliary gun are determined; a vacuum system is started, the circulating gas flow quantity is adjusted, and thus circulating decarburization begins to be conducted on the molten steel; after decarburization, temperature of the molten steel is measured, first temperature is obtained, and if the first temperature is within the target temperature range, alloying is conducted;after alloying, the vacuum degree is kept, the circulating gas flow quantity is increased, and circulation is conducted for 5-8 min again; and after circulation, the vacuum is broken, and the steel ladle is lifted away from the RH station. The technical effects that the secondary combustion ratio is increased effectively, adhesion of the upper portion of a vacuum chamber and the top of a hot bentpipe is reduced, the influence on vacuumizing is lowered, and life of the hot bent pipe is prolonged are achieved.

Description

technical field [0001] The present application relates to the technical field of steelmaking, in particular to a RH refining control method and device. Background technique [0002] In the smelting process of low-carbon and ultra-low-carbon steel, RH is the most commonly used refining process, which can realize functions such as rapid decarburization, alloying, temperature adjustment, and gas removal. At present, advanced IF steel manufacturers at home and abroad mainly use three processes: RH-OB, RH-KTB and RH-MFB. The common feature of these three processes is that they all supply oxygen to the vacuum chamber to complete decarburization and temperature rise. During the carbonization period, low gun position is used to supply oxygen. Oxygen mainly reacts with C in molten steel to form, most of CO is discharged with exhaust gas, and the secondary combustion efficiency is low, generally around 30-60%. [0003] However, in the process of implementing the technical solutions i...

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Problems solved by technology

[0005] The embodiment of the present application provides a RH refining control method and device to solve the problem of using low lance position oxygen supply in the prior art during the decarburization period, C-O violently reacts to generate CO, insufficient combustion, and serious splashing of molten steel, due to The temperature in the upper part of the vacuum chamber is low, and the splashed molten steel is very easy to form nodules on the surface of the refractory material, which will cause blockage of the hot bend pipe and affect the life of the hot bend pipe and the technical problem of vacuuming ability. By setting the RH sub-lance, the effective improvement has been achieved. The secondary combustion rate in the RH decarburization process reduces the sticky slag on the upper part of the RH vacuum chamber and the top of the hot elbow, thereby reducing the impact on the vacuuming ability and prolonging the technical effect of the hot elbow service life

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