Method for increasing energy utilization rate for escaped carbon monoxide and hydrogen in vacuum decarburization process for molten steel

Abstract

The invention discloses a method for increasing an energy utilization rate for escaped carbon monoxide and hydrogen in a vacuum decarburization process for molten steel. The method for increasing an energy utilization rate for the escaped carbon monoxide and hydrogen in the vacuum decarburization process for the molten steel comprises the following steps: S1, before vacuum decarburization, carrying out deep deoxidization on the molten steel to form deoxidized molten steel, and keeping the deoxidized molten steel to be in a low-oxygen-level state; S2, vacuumizing an RH vacuum chamber after thedeoxidized molten steel enters the RH vacuum chamber, enabling the deoxidized molten steel to cyclically enter the RH vacuum chamber, controlling an oxygen gun to blow oxygen to the RH vacuum chamber,and entering a vacuum decarburization program; and S3, in a vacuum decarburization process, controlling the gun position of the oxygen gun in real time on the basis of the components of target gas inexhausted gas of the RH vacuum chamber to control the components of the target gas to be in a target range. The deep deoxidization is carried out on the molten steel before decarburization, dissolvedoxygen is controlled to be under the condition that oxygen blowing is started at the beginning of vacuum establishment, and a concentrated carbon-oxygen reaction is basically not carried out before concentrated deoxidization is completed; a dehydrogenation process and a decarburization process are separated, a decarburization speed can be greatly controlled according to an oxygen blowing speed, and synchronous massive escape is avoided, so that serious splashing is avoided.

Description

technical field [0001] The invention belongs to the technical field of refining outside the steelmaking furnace, and more specifically, the invention relates to a method for improving the utilization rate of carbon monoxide and hydrogen energy released during the vacuum decarburization process of molten steel. Background technique [0002] Among the many decarburization methods outside the molten steel furnace, ladle external circulation refining devices, such as RH, have been widely used due to their advantages such as good decarburization efficiency, short treatment cycle, good refining effect, and powerful comprehensive functions. Especially in recent years, with the development of manufacturing industries such as automobiles, home appliances, and electrics, the demand for decarburized steel has increased. However, the decarburization process is achieved by the circulation of molten steel in the vacuum chamber. The refractory materials and circulating lifting gas in the v...

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Problems solved by technology

At this time, although the combustion reaction of carbon monoxide and hydrogen occurs, because the total amount of oxygen blowing is not large and the flow rate of oxygen blowing cannot be increased during the stage of large-scale production of carbon monoxide, the utilization rate of the escaped combustible gas is not high, and most of it is still discharged vacuum chamber

It can be seen that no matter whether the current vacuum decarburization method is oxygen blowing or not, as long as the dissolved oxygen in the steel is high, there will be uncontrollable reaction and escaped gas, low utilization efficiency of valuable combustible gas, and insufficient secondary energy in the process. problem of use

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