Secondary mixer for coal spraying with blast furnace

A technology of secondary mixing and blast furnace coal injection, applied in blast furnaces, blast furnace details, blast furnace parts, etc., can solve problems such as uneven mixing, reduce the number of blockages, eliminate pulsation, and uniformly inject dense phases.

Inactive Publication Date: 2012-01-11
SHOUGANG CHANGZHI IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a secondary mixer for blast furnace coal injection, through which the coal injection secondary mixer is passed through the middle end of the main coal injection pipeline to realize the secondary mixing of coal powder, overcome the disadvantage of uneven mixing of the original injection mixer, and make the The solid-gas ratio at the end of the main coal injection pipeline reaches 70Kg / m 3- 75Kg / m 3 , to achieve uniform, dense phase injection of pulverized coal

Method used

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  • Secondary mixer for coal spraying with blast furnace
  • Secondary mixer for coal spraying with blast furnace
  • Secondary mixer for coal spraying with blast furnace

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Embodiment Construction

[0019] Describe in detail below in conjunction with accompanying drawing.

[0020] as the picture shows:

[0021] The gas double-layer pipe connector 3 is a double-layer pipe structure, the inner pipe 9 is a pulverized coal passage, the outer pipe 10 is a gas passage, and the outer pipe 9 communicates with the gas pipeline; one end of the gas double-layer pipe connector 3 passes through the flange 8 and The flange 2 at the inlet end of the coal injection main pipeline 1 is connected, and the other end is connected to the mixer core 5 through the flange 11. There is a mixing tank in the middle of the flange 11, and a hole in the mixing tank communicates with the gas source;

[0022] The mixer core 5 is a cylindrical hollow casting body, with sealing grooves 12, 13, 14 on both sides of the casting body, and O-shaped sealing rings are installed to connect with the flanges on both sides; the casting body is radially symmetrical with two mixed gas through holes 15 , a mixed air ho...

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Abstract

The invention discloses a secondary mixer for coal spraying with a blast furnace. The secondary mixer comprises a total pipeline for coal spraying, a connecting piece of double pipelines of coal gas, gas supply pipes, a capacity control valve of the gas supply pipe, mixer cores, a variable diameter pipe and the like. The gas supply pipe which is leaded on a nitrogen pipeline of an aeration valve of the total pipeline for coal spraying is arranged along the total pipeline for coal spraying to the connecting piece of double pipelines of coal gas for connecting with the secondary mixer, so a phenomenon of uneven mixing of coal and the gas in the total pipeline for coal spraying can be effectively eliminated, a pulsation phenomenon in the coal dust spraying can be eliminated, the obstruction frequency of a spray gun is reduced, and the even blowing of a dense phase is realized.

Description

technical field [0001] The invention belongs to the category of smelting, and in particular relates to a mixer used for blowing coal powder into a blast furnace. Background technique [0002] Blast furnace pulverized coal injection technology uses cheap non-coking coal to partially replace expensive metallurgical coke. This technology is conducive to the intensified smelting of blast furnaces and smooth operation of furnace conditions. It can greatly improve the technical and economic indicators of blast furnaces, alleviate the demand for coke carbon, reduce the infrastructure investment for building coke ovens, and reduce environmental pollution caused by coking production. Therefore, it is economical. Benefits and social benefits are remarkable. Therefore, efforts to increase the coal ratio have become an important way for various ironworks to reduce the cost of pig iron. [0003] At present, the blast furnace pulverized coal injection device includes a coal injection ta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/00F27D3/18
Inventor 张联兵
Owner SHOUGANG CHANGZHI IRON & STEEL
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