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Method for removing blast furnace shaft wall accretion

A blast furnace and thickening technology, applied in blast furnace, blast furnace details, blast furnace parts and other directions, can solve the problems of difficult to grasp the amount of net coke just right, affecting the life of the blast furnace, unreliable effect, etc., to achieve easy and accurate adjustment and cleaning Reliable slag skin, loss reduction effect

Active Publication Date: 2017-05-31
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to add net coke and greatly reduce the coke load, and simply increase the temperature to remove: its shortcomings: the effect is not reliable, and even the position of the soft melting zone caused by the large fluctuation of the furnace temperature increases the thickness of the knot and the furnace temperature is too high. Suspended materials increase the thickness of the knot; ②Wash the furnace by adding manganese ore, fluorite and other furnace cleaning agents: its shortcomings: it is impossible to accurately make the added manganese ore or fluorite react with the slag skin just at the thick part of the knot, and the fluorite Use will also develop and erode the furnace lining, affecting the life of the blast furnace; ③ Blasting with explosives
This method has a high success rate in dealing with slag skin, but it is not successful every time. Sometimes it takes several times of the same measures to clean up the slag skin, and there are unpredictable factors in hanging and sitting materials. The depth of the furnace is also unpredictable, so the amount of net coke added is difficult to grasp just right, the furnace temperature fluctuates greatly, and even causes the furnace to cool down.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Blast furnace (effective volume 3200m 3 ) The thickness of the furnace body junction is 557mm, and the cleaning steps are:

[0019] 1) Properly develop two airflows first, reduce the ore at the edge and the center by one ring each, and reduce the coke load, add 500kg of coke to each batch of material, increase the furnace temperature ([si] content) to about 0.6%, and reduce the slag The alkalinity is reduced from 1.20 to about 1.10, and 600kg of manganese ore is added to each batch of ore;

[0020] 2) When the furnace temperature reaches about 0.6%, start loading 120t net coke, and adjust the coke load to 2.7, and calculate the number of batches that need to be loaded according to the position of the root of the slag bark;

[0021] 3) Stop feeding and carry out empty material line operations: try to maintain a large air volume and stop coal injection (N2 from the coal gun does not stop); control the amount of water sprinkled on the furnace top so that the temperature o...

Embodiment 2

[0026] Blast furnace (effective volume 3200m 3 ) The average thickness of the furnace body is 476mm, and the processing steps are:

[0027] 1) Properly develop two airflows first, reduce the ore at the edge by one ring, and reduce the coke in the center by one ring (because the air volume is too small after the knot is thick, the center of the material surface is higher, and the dead coke column is larger), and the coke is lightened Load, add 500kg of coke to each batch of materials, increase the furnace temperature ([si] content) to about 0.6%, reduce the slag alkalinity from 1.21 to about 1.10, and add 600kg of manganese ore to each batch of ore;

[0028] 2) When the furnace temperature reaches about 0.6%, start loading 100t of clean coke, and adjust the coke load to 2.7, and calculate the number of batches that need to be loaded according to the position of the root of the slag bark;

[0029] 3) Stop feeding and carry out empty material line operations: try to maintain a l...

Embodiment 3

[0034] Blast furnace (effective volume 2600m 3 ) The average thickness of the furnace body is 340mm (the local thickest part is 460mm), and the processing steps are:

[0035] 1) Properly develop two airflows first, cancel the ore at the No. 9 corner of the edge (that is, only coke is placed at the No. 9 corner), and reduce one ring of coke in the center (because the air volume is too small after the knot is thick, the center of the material surface is higher, and the dead The coke column is relatively large), and the coke load is lightened. Add 400kg of coke to each batch of materials to increase the furnace temperature ([si] content) to about 0.6%, and reduce the slag alkalinity from 1.20 to about 1.10. Add 500kg manganese ore;

[0036] 2) When the furnace temperature reaches about 0.6%, start loading 80t of clean coke, and adjust the coke load to 2.7, and calculate the number of batches that need to be loaded according to the position of the root of the slag bark;

[0037]...

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PUM

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Abstract

The invention provides a method for removing blast furnace shaft wall accretion. The method comprises the following steps: keeping the basic smoothness of the furnace operating conditions, and controlling the adequate furnace temperature; adding a right amount of clean coke into the furnace to enhance the fuel ratio of the regular burden; carrying out descending stockline operation; carrying out blast furnace staying; plugging part of air ports with mud, and blasting to perform production; and breaking the sludge-plugged air ports to restore the regular production of the blast furnace. The method can expose the slag crust on the furnace shaft inner wall, and has great heat flow scouring actions on the slag crust, so that the slag crust can be removed reliably and thoroughly. The method has the advantages of small fluctuations of furnace operating conditions and short time consumption for slag removal.

Description

technical field [0001] The invention belongs to the technical field of blast furnace shaft cleaning, and in particular relates to a method for removing thickening of blast furnace shafts. Background technique [0002] A blast furnace is a closed device for making pig iron. The basic principle is to add iron-containing ore (such as sinter, pellet ore, natural lump) and fuel (coke) from the upper part of the blast furnace, and blow high-pressure hot air from the lower part (tuyere) of the blast furnace, in which oxygen-enriched ( That is, to increase the oxygen content in the wind), and to carry out pulverized coal injection. The heat generated by the combustion of pulverized coal and coke in front of the tuyere and the high-temperature reducing gas undergo a series of physical and chemical reactions with the iron ore to form molten iron. The raw fuel added from the top of the furnace is continuously heated, decomposed, reduced, softened, melted, dripped, carburized, and fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/00
CPCC21B7/00
Inventor 谢友阳董汉东陆隆文李向伟尹腾李昕
Owner 武汉钢铁有限公司
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