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Top-bottom combined blowing converter shutdown method

A top-bottom combined blowing and converter technology, applied in the manufacture of converters, etc., can solve the problems of large water consumption, large resource consumption, and affecting the operation rate of converters, and achieve the effect of efficient shutdown and rapid cooling

Active Publication Date: 2022-04-15
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cooling method, that is, after the furnace is stopped, wait for the converter to cool down slowly, through the thermal expansion and contraction of the lining bricks, a gap will be formed between the lining bricks and the converter, and the lining bricks will be removed from the converter by a furnace dismantling machine. This method, The shutdown period is too long, which seriously affects the operation rate of the converter; the soaking method, that is, through the fire hydrant, after the converter is shut down, water is continuously drawn into the furnace, and the cooling speed of the converter is improved through water immersion, and the shutdown efficiency is improved. In this method, the shutdown time is still more than 36 hours, and the water consumption is huge, and the resource consumption is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A high-efficiency shutdown method for a 260-ton top-bottom combined blowing converter, including:

[0025] 1) After the end of converter smelting in the three furnaces before the shutdown, spray the slag on the furnace cap with an oxygen lance for each furnace:

[0026] Oxygen blowing flow of oxygen lance 35000Nm 3 / h, manually open the nitrogen seal of the oxygen lance and the nitrogen seal of the auxiliary lance; open the quick-cut valve of the oxygen lance, and the position of the oxygen lance moves up and down between 11m-13m; After lifting the gun, inject the slag accumulation at the furnace cap for 1.5 minutes. After the injection, adjust the oxygen flow rate to the blowing flow rate of 53700Nm 3 / h;

[0027] 2) After the last furnace is tapped before the furnace is shut down, the furnace bottom operation is carried out, the details are as follows:

[0028] a. Oxygen blowing flow of oxygen lance is 49000Nm 3 / h, manually open the nitrogen seal of the oxygen la...

Embodiment 2

[0038] A method for efficiently shutting down a 200-ton top-bottom combined blowing converter, including:

[0039] 1) After the end of converter smelting in the three furnaces before the shutdown, spray the slag on the furnace cap with an oxygen lance for each furnace:

[0040] Oxygen blowing flow of oxygen lance 33000Nm 3 / h, manually open the nitrogen seal of the oxygen lance and the nitrogen seal of the auxiliary lance; open the quick-cut valve of the oxygen lance, and the position of the oxygen lance moves up and down between 11m-13m; After lifting the gun, inject the slag accumulation at the furnace cap for 1.5 minutes. After the injection, adjust the oxygen flow rate to the blowing flow rate of 50000Nm 3 / h;

[0041] 2) After the last furnace is tapped before the furnace is shut down, the furnace bottom operation is carried out, the details are as follows:

[0042] a. Oxygen blowing flow of oxygen lance is 49000Nm 3 / h, manually open the nitrogen seal of the oxygen l...

Embodiment 3

[0052] A method for efficiently shutting down a 300-ton top-bottom combined blowing converter, including:

[0053] 1) After the end of converter smelting in the three furnaces before the shutdown, spray the slag on the furnace cap with an oxygen lance for each furnace:

[0054] Oxygen blowing flow of oxygen lance 36000Nm 3 / h, manually open the nitrogen seal of the oxygen lance and the nitrogen seal of the auxiliary lance; open the quick-cut valve of the oxygen lance, and the position of the oxygen lance moves up and down between 11m-13m; After lifting the gun, inject the slag accumulation at the furnace cap for 1.5 minutes. After the injection, adjust the oxygen flow rate to blowing flow rate of 55000Nm 3 / h;

[0055] 2) After the last furnace is tapped before the furnace is shut down, the furnace bottom operation is carried out, the details are as follows:

[0056] a. Oxygen blowing flow of oxygen lance: 51000Nm 3 / h, manually open the nitrogen seal of the oxygen lance a...

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PUM

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Abstract

The invention relates to a top-bottom combined blowing converter blowing-out method, which specifically comprises the following steps: 1) after the smelting end point of three converters before blowing-out, spraying accumulated slag on a converter crown at a converter mouth by using an oxygen lance every time: 2) after tapping of the last converter before blowing-out, carrying out converter bottom melting operation; (3) reducing the temperature of the lining brick by combining sublance water with converter oxygen lance nitrogen blowing, pumping water into the converter by utilizing sublance water jacket water after the converter is shut down, and cooling by combining with converter oxygen lance nitrogen blowing; 4) blowing nitrogen from the bottom after the furnace is shut down; (5) all water in the furnace is poured into a slag channel; and (6) brick raking. Before the converter is shut down, surplus heat of the converter is used for opening a converter mouth and melting a converter bottom, and the thickness of lining bricks at key parts is reduced; the temperature of the lining brick is rapidly reduced by combining sublance water with converter oxygen lance nitrogen blowing; and the bottom lance flow is adjusted to promote rapid cooling of the converter bottom and ensure safe and efficient blowing-out of the converter.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, and relates to a method for shutting down a top-bottom combined blowing converter. Background technique [0002] After one furnace service cycle of the converter is over, it is necessary to peel off the converter lining bricks from the converter shell, but due to the long-term high-temperature operation and the wetting effect of the molten steel on the furnace lining, the lining bricks are closely attached to the furnace shell, and it is difficult to quickly remove the bricks. In order to improve the utilization factor of the converter, it is necessary to provide a safe and efficient method for shutting down the converter. [0003] At present, there are two conventional methods for shutting down the converter, the cooling method and the soaking method. Cooling method, that is, after the furnace is stopped, wait for the converter to cool down slowly, through the thermal expansion ...

Claims

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Application Information

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IPC IPC(8): C21C5/35C21C5/44
CPCY02P10/20
Inventor 陈晨王富亮尚德义周景辉苏小利赵自鑫齐金生黄岩刘延信
Owner ANGANG STEEL CO LTD