RH cold steel removing method

Abstract

The invention discloses a RH cold steel removing method, and belongs to the field of external refining RH zone cold steel removing technology. The RH cold steel removing method is used for solving problems that conventional methods are long in cold steel removing time, and are unsafe. The RH cold steel removing method comprises following steps: operation preparation, wherein RH top lance is arranged at the top part of a RH furnace vacuum groove, the positions of the RH top lance can be adjusted, the RH top lance is connected with a device used for providing pure oxygen, and oxygen flow amount can be adjusted; and cold steel removing, wherein according to the different positions of cold steel in the vacuum groove, a plurality of spraying segments are set based on the positions of the RH top lance from high to low, pure oxygen flow is sprayed onto cold steel in the vacuum groove at each segment in sequence, pure oxygen flow amount and spraying time are adjusted at different segments, exothermic reaction of pure oxygen with ferric oxide in cold steel is realized, cold steel in the vacuum groove is removed via melting, and cold steel removing is completed after the last operation period. Top lance positions are set according to the height, the RH cold steel removing method is used for heat melting cold steel in different positions in the RH groove, cold steel removing efficiency is increased, cold steel removing time is shortened, and operation safety is increased because that pure oxygen contains no impurity.

Description

technical field [0001] The invention relates to the technology of removing chilled steel in the RH area of ​​refining outside the furnace, in particular to a method for removing chilled steel in the RH area. Background technique [0002] Cold steel refers to the molten steel and steel slag splashed in the vacuum tank during the vacuum treatment of the RH furnace, which solidifies for a long time and accumulates to form steel and slag polymers. [0003] The cold steel in the vacuum tank of the RH furnace will not only affect the vacuum degassing area, but also deteriorate the quality of the molten steel after refining in the RH furnace. Therefore, the cold steel in the vacuum tank of the RH furnace must be melted and removed, which is called RH decooling in the industry. steel. [0004] The existing RH cold steel removal technology mainly uses RH-KTB oxygen gun to inject gas to the cold steel, supplemented by air (the ratio of gas to air is about 1:1), and uses the high calo...

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Problems solved by technology

[0006] In addition, if the safety measures are not in place for the gas to be removed from the cold steel, it is easy to bring safety hazards to the site. This is because the main vacuum valve in the equipment is a butterfly valve with a diameter of about 2 meters, which cannot be completely closed and leaks. Large flow of cold steel, and the gun position is high, because there is a considerable amount of hydrogen in coke oven gas (hydrogen content in coke oven gas is about 50%), and the proportion of unburned waste gas (mainly hydrogen) is relatively light. Gathered in the vacuum main valve to the steam pump area (this is also the highest position of the vacuum system), it is easy to reach the explosion limit. When the pre-vacuum starts and the water ring pump starts, the atmospheric recovery valve behind the valve is also closed at the same time. Form a short-term confined space, and the heat in the vacuum tank rises and it is easy to cause a loud explosion and explosion

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