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Operation method for baking scrap steel in converter

An operation method and converter technology, applied in the field of iron and steel smelting, can solve the problems of large water price difference of waste iron and steel, insufficient overall heat, reduction of baking efficiency and increase of energy consumption, etc., so as to increase the scrap ratio, improve baking efficiency, and reduce furnace lining. damage effect

Inactive Publication Date: 2021-01-29
ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an operation method for roasting scrap steel in a converter furnace, which is used to solve the above-mentioned background technology that proposes a large price difference of scrap molten iron, insufficient supply of blast furnace molten iron in stages, and an increase in the ratio of scrap steel resulting in insufficient overall heat. Now a coal-oxygen lance is used. Baking and preheating in the converter furnace, using coke oven gas for baking and baking takes a long time, the ratio of scrap steel is raised slowly, and it is easy to cause damage to the furnace lining, which will lead to a decrease in the baking efficiency of the converter for scrap steel and increase energy consumption. technical issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparatory work: Prepare the converter, scrap steel, and coal oxygen lance;

[0024] Step (1), move the coal oxygen gun to the working position 3m away, ignite it at the position of the long open flame at the mouth of the oxygen gun, and then lower it to the waiting position;

[0025] Step (2), put the steel scrap in the 2 troughs into the converter, shake the furnace back and forth 3-5 times to make the steel scrap evenly distributed, then shake the furnace upright, adjust the gas opening to 600Nm3 / h, and the oxygen opening to 500Nm3 / h ;

[0026] Step (3), judging that the flame is normal, the gun position is lowered to a certain value, and the gun is pressed according to the sound of impacting scrap steel, and the oxygen gun is quickly lowered to a certain value (relative height) after the specified time;

[0027] Step (4), lift the gun after baking for 6 minutes, turn off the oxygen after baking, and then turn off the gas;

[0028] Step (5), finally open the nitro...

Embodiment 2

[0037] Preparatory work: Prepare the converter, scrap steel, and coal oxygen lance;

[0038] Step (1), move the coal oxygen gun to the working position 3.2m away, ignite it at the position of the long open flame at the mouth of the oxygen gun, and then lower it to the waiting position;

[0039] Step (2), put the steel scrap in the 2 troughs into the converter, shake the furnace back and forth 3-5 times to make the scrap steel evenly distributed, then shake the furnace upright, adjust the gas opening to 700Nm3 / h, and the oxygen opening to 600Nm3 / h ;

[0040] Step (3), judging that the flame is normal, the gun position is lowered to a certain value, and the gun is pressed according to the sound of impacting scrap steel, and the oxygen gun is quickly lowered to a certain value (relative height) after the specified time;

[0041] Step (4), after baking for 7.5 minutes, lift the gun, turn off the oxygen after baking, and then turn off the gas;

[0042] Step (5), finally open the ...

Embodiment 3

[0051] Preparatory work: Prepare the converter, scrap steel, and coal oxygen lance;

[0052] Step (1), move the coal oxygen gun to the 3.4m of the working position, ignite at the position of the permanent flame at the mouth of the oxygen gun, and then drop to the waiting position;

[0053] Step (2), put the steel scrap in the 2 troughs into the converter, shake the furnace back and forth 3-5 times to make the scrap steel evenly distributed, then shake the furnace upright, adjust the gas opening to 800Nm3 / h, and the oxygen opening to 700Nm3 / h ;

[0054] Step (3), judging that the flame is normal, the gun position is lowered to a certain value, and the gun is pressed according to the sound of impacting scrap steel, and the oxygen gun is quickly lowered to a certain value (relative height) after the specified time;

[0055] Step (4), lift the gun after baking for 9 minutes, turn off the oxygen after baking, and then turn off the gas;

[0056] Step (5), finally open the nitrogen...

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Abstract

The invention discloses an operation method for baking scrap steel in a converter. The method includes the following processing steps that preparation work is performed, specifically, the converter, scrap steel and a coal oxygen lance are prepared; Step 1, the coal oxygen lance is moved to a working position, igniting is performed in an ever-burning fire position of an oxygen lance opening, and then descending to a waiting position is performed; Step 2, two troughs of the scrap steel are added to the converter, the converter is shaken back and forth for 3-5 times to uniformly distribute the scrap steel, and then the furnace is shaken right, the opening degrees of coal gas and oxygen are adjusted to specified parameters, and it is judged that flames are normal. According to the method, thescrap steel is used in the converter special steel workshop, the specially-made coal oxygen lance is used, the purposes of short baking time, much scrap steel ratio increase, furnace lining damage reduction, baking efficiency improvement, consumption reduction and the like can be achieved, the opening degree change parameters, process lance position change and the like of a process adjusting valveare defined, through the baking method, the scrap steel ratio can be increased to 30% or above, the scrap steel baking time can be controlled within 10 min, efficient baking is achieved, and the process production rhythm is basically not affected.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to an operation method for baking scrap steel in a converter furnace. Background technique [0002] Converter, pronunciation, a Chinese word, means a kind of steelmaking furnace. Generally refers to a cylindrical oxygen-blowing steelmaking vessel that can be tilted. The furnace body is cylindrical, mounted on a horizontal shaft frame, and can be rotated. It is also used for steelmaking. Scrap steel is scrap steel that is eliminated or damaged in production and living projects and used as recycling; its carbon content is generally less than 2.0%, and its sulfur and phosphorus content is not more than 0.05%. Scrap steel has various shapes due to its different production conditions, and its performance is basically the same as that of the finished product that produces this kind of scrap steel, but it is also affected by factors such as aging effectiveness and fatigue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/56
CPCC21C5/28C21C5/565Y02P10/20
Inventor 黄永林
Owner ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD
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