The method of cleaning the blast furnace before shutting down

A blast furnace and furnace washing technology, which is applied to the field of blast furnace iron-making empty material line shutdown, can solve the problem of unclean furnace walls, prolonged blast furnace shutdown time, and long processing time of furnace wall adhesions and hearth deposits, etc. problems, to achieve the effect of saving blast furnace shutdown time, improving fluidity, and shortening cleaning time

Active Publication Date: 2022-04-12
SGIS SONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the furnace wall is not clean after shutdown using the empty material line shutdown method, and there are still many places on the furnace wall with adhesives, and there are accumulations in the hearth. It takes a long time to process the material and hearth accumulation, prolonging the shutdown time of the blast furnace

Method used

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  • The method of cleaning the blast furnace before shutting down
  • The method of cleaning the blast furnace before shutting down
  • The method of cleaning the blast furnace before shutting down

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A method for cleaning a blast furnace before shutdown, comprising:

[0048] S1. Use silica, medium marble and manganese ore as auxiliary materials, and distribute them in the throat of the blast furnace.

[0049] S2. Under the condition of the edge temperature of 275°C, smelting by washing furnace for 5 days: first smelting according to the coal injection ratio of 160kg / t for 3 days; then smelting according to the coal injection ratio of 110kg / t for 1.5 days; then gradually reducing the coal injection ratio , and started full-coke smelting on the 4.67th day.

[0050] S3. Add wind-off material to carry out pre-shut-off operation.

[0051] In this example, the model of blast furnace is 1050m 3 Level, the cloth operation to achieve the edge temperature requirement is as follows:

[0052] Adjust the cloth matrix from the cloth method in Table 1 to the cloth method in Table 2. Among them, the cloth for the outer ring of ore is reduced from 3 rings to 2 rings, the cloth f...

Embodiment 2

[0058] A method for cleaning a blast furnace before shutdown, comprising:

[0059] S1. Use silica, medium marble and manganese ore as auxiliary materials, and distribute them in the throat of the blast furnace.

[0060] S2. Under the condition of edge temperature of 250°C, furnace washing and smelting for 5 days: first smelting at a coal injection ratio of 155kg / t for 3 days; then smelting at a coal injection ratio of 100kg / t for 1.3 days; then gradually reducing the coal injection ratio , and started full-coke smelting on the 4.67th day.

[0061] S3. Add wind-off material to carry out pre-shut-off operation.

[0062] Wherein, the component content in the molten iron and the temperature of the molten iron are the same as in Example 1, and the component content in the slag is the same as in Example 1.

Embodiment 3

[0064] A method for cleaning a blast furnace before shutdown, comprising:

[0065] S1. Use silica, medium marble and manganese ore as auxiliary materials, and distribute them in the throat of the blast furnace.

[0066] S2. Under the condition of edge temperature of 300°C, smelting by washing the furnace for 5 days: first smelting according to the coal injection ratio of 165kg / t for 3 days; then smelting according to the coal injection ratio of 120kg / t for 1.7 days; then gradually reducing the coal injection ratio , and started full-coke smelting on the 4.67th day.

[0067] S3. Add wind-off material to carry out pre-shut-off operation.

[0068] Wherein, the component content in the molten iron and the temperature of the molten iron are the same as in Example 1, and the component content in the slag is the same as in Example 1.

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Abstract

The application provides a method for cleaning a blast furnace before shutting down, and belongs to the technical field of shutting down an empty material line for blast furnace ironmaking. The method of washing the blast furnace before shutting down includes distributing cloth in the throat of the blast furnace, and then performing furnace washing and smelting. The standards for the furnace washing and smelting steps include: the edge temperature is 250-300°C, and the molten iron temperature is ≥1480°C. Through the step of distributing materials, in the step of furnace washing and smelting: in the slag, R is 1.05-1.16, the content of MgO is 8.0-9.0wt%, and the content of Al 2 o 3 The content of Si is ≤15.0wt%; in molten iron, the content of Si is 0.60-0.90wt%, the content of S is 0.025-0.045wt%, and the content of Mn is 0.50-0.80wt%. It can shorten the cleaning time of the furnace wall and the furnace hearth, and effectively save the shutdown time of the blast furnace.

Description

technical field [0001] The present application relates to the technical field of shutting down an empty material line for blast furnace ironmaking, and in particular, relates to a method for cleaning a blast furnace before shutting down. Background technique [0002] At present, the large and medium maintenance of the blast furnace generally adopts the method of stopping the furnace with an empty material line. First, it can create convenient conditions for the large and medium maintenance and realize a safe and smooth shutdown; downtime. [0003] In the prior art, the furnace wall is not clean after shutdown using the empty material line shutdown method, and there are still many places on the furnace wall with adhesives, and there are accumulations in the hearth. It takes a long time to process the material and hearth accumulation, which prolongs the shutdown time of the blast furnace. Contents of the invention [0004] The purpose of this application is to provide a me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00C21B5/04
CPCC21B5/00C21B5/008C21B5/04
Inventor 陈小东丘文生柏德春余骏陈国忠陈生利范国光邢文青
Owner SGIS SONGSHAN CO LTD
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