Oxygen furnace steel method capable of improving jet velocity through preheated oxygen

Abstract

The invention belongs to the technical field of metallurgy, and relates to an oxygen furnace steel method capable of improving jet velocity through preheated oxygen. The method comprises the following steps: the oxygen flows into a preheating system from a normal temperature pipeline, the oxygen is preheated by high-temperature smoke for steel making or heat generated by electric heating or fuel combustion system, the oxygen temperature is controlled by adjusting heat input, and the preheated oxygen is subjected to blowing steel making by utilizing supersonic jet generated by an oxygen gun spray head. The method has the characteristics that the oxygen is preheated, and the preheated high-temperature oxygen is blown by the oxygen gun, so that the jet velocity of the oxygen is remarkably increased, the stirring effect is enhanced, the dynamics condition for reaction of a molten bath is improved, and the service life of the oxygen gun spray head is prolonged. The oxygen furnace steel method is suitable for steel-making processes of an electric arc furnace of 30-200 tons and a converter of 30-350 tons, in comparison with the conventional steel making process, the carbon removal speed and the phosphorus removal speed are remarkably improved, the smelting period is shortened by more than 2 minutes, the metal yield is improved by more than 1%, and the slag consumption is reduced by 10%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to an oxygen-blowing steelmaking method in which oxygen is preheated to increase jet velocity. Background technique [0002] Oxygen blowing is an important process in the process of converter and electric arc furnace steelmaking. Due to the limitation of high pressure oxygen pipeline resistance, energy conversion and other factors, the Mach number is designed to be below 2.3, and most of them are controlled between 1.4 and 2.1. Therefore, the steelmaking process has disadvantages such as relatively short effective oxygen injection distance, limited oxygen stirring intensity, and slow uniformity of molten pool composition and temperature. [0003] Usually, the temperature of the oxygen jet flow injected into the molten pool by normal temperature oxygen is as low as 213K (-60°C), and the heat exchange with the high-temperature molten pool causes the heat loss of the high-temperatur...

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Problems solved by technology

Therefore, the steelmaking process has disadvantages such as relatively short effective oxygen injection distance, limited oxygen stirring intensity, slow uniformity of molten pool composition and temperature, etc.

[0003] Usually, the temperature of the oxygen jet flow injected into the molten pool by normal temperature oxygen is as low as 213K (-60°C), and the heat exchange with the high-temperature molten pool causes the heat loss of the high-temperature molten pool to account for about 3-6 of the total physical sensible heat of molten iron in the molten pool. %, at the same time, the oxygen jet enters the steelmaking furnace and undergoes a "heating-reaction" process, which reduces the reaction speed of steel slag

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