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

A technology of jet velocity and oxygen flow, which is applied in the field of metallurgy, can solve problems such as the composition and temperature of the molten pool are uniform and slow, reduce the reaction speed of steel slag, and limit the intensity of oxygen stirring, so as to shorten the smelting cycle, strengthen the stirring ability, decarburization and decarburization Phosphorus efficiency improvement effect

Active Publication Date: 2012-10-17
UNIV OF SCI & TECH BEIJING
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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

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

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Embodiment Construction

[0020] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0021] (1) The present invention is applied to the furnace wall oxygen lance of a 50-ton electric arc furnace, the Mach number of the nozzle is 2, and the flow rate of the oxygen lance is 1500Nm 3 / h, pressure 0.8MPa. The segmental control process of smelting is as follows:

[0022] Melting period: Oxygen flow rate is 1000Nm 3 / h, after the flue gas is preheated, the temperature of the incoming oxygen flow can reach 900K, and the jet flow velocity at the nozzle outlet can reach 840m / s. , increased by about 0.52m, the temperature and composition of the molten pool are fast and uniform, and the melting time of scrap steel is shortened by 0.3-0.8 minutes;

[0023] Decarburization period: oxygen supply flow rate is 2000Nm 3 / h, after the flue gas is preheated, the temperature of the incoming oxygen flow can reach 1200K, and the jet flow velocity a...

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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...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C5/52
CPCY02P10/20
Inventor 朱荣王慧董凯吕明谷云岭刘福海林腾昌朱常福王洪刘润藻仇永全
Owner UNIV OF SCI & TECH BEIJING
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