Method for increasing particle size of pulverized coal injected from blast furnace

A technology of injecting coal and pulverized coal into blast furnaces, applied to blast furnaces, blast furnace details, furnaces, etc., to achieve the effects of increasing production, improving efficiency, and reducing costs

Inactive Publication Date: 2019-09-17
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for relaxing the granularity of pulverized coal injection in blast furnaces, and to solve the problem of how to relax the particle size of pulverized coal injection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The mixed coal of bituminous coal: anthracite = 55:45 is made into pulverized coal of less than 80 mesh through a coal mill. 40% of powder weight.

Embodiment 2

[0016] The mixed coal of bituminous coal: anthracite = 55:45 is made into pulverized coal of less than 80 mesh through a coal mill. 45% of powder weight.

Embodiment 3

[0018] The mixed coal with a mass ratio of bituminous coal: anthracite = 55:45 is made into pulverized coal less than 80 mesh through a coal mill. Accounting for 50% of the weight of mixed coal powder.

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PUM

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Abstract

The invention discloses a method for increasing the particle size of pulverized coal injected from a blast furnace. The method comprises the following steps of selecting mixed pulverized coal containing bituminous coal and anthracitic coal as injecting pulverized coal, wherein the weight percentage of the anthracitic coal accounts for smaller than 45% of the total weight of the mixed pulverized coal, and grinding until the particle size of the mixed pulverized coal includes -200-mesh pulverized coal accounting for 40%-60% of the total quantity of the pulverized coal, and the balance of mixed pulverized coal of smaller than 80 meshes. The invention aims to provide the method for increasing the particle size of pulverized coal injected from the blast furnace. According to the method, the particle size of the injected mixed pulverized coal is increased, the yield of a coal mill is improved, the explosibility of the pulverized coal is reduced, the safety of injecting pulverized coal from the blast furnace is improved, the costs of enterprises are reduced, and the benefits of enterprises are increased.

Description

technical field [0001] The invention relates to the technical field of pulverized coal for blast furnace injection, in particular to a method for relaxing the particle size of pulverized coal for blast furnace injection. Background technique [0002] Injecting pulverized coal is not only an important adjustment measure for blast furnace operation, but also can replace metallurgical coke to reduce costs. However, the effect of coal injection is directly related to the combustion status of pulverized coal. Iron workers have always believed that the finer the pulverized coal, the more complete the combustion and the higher the combustion rate, so -200 mesh is required to account for more than 80%. However, the finer the pulverized coal is, the higher the energy consumption is, and the output is also limited. In recent years, the continuous development of coal injection technology and the rational use of oxygen-enriched and high-temperature wind have allowed the particle size ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
CPCC21B5/003
Inventor 王雅军孙睿赵永红
Owner BAOTOU IRON & STEEL GRP
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