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Continuous casting billet secondary cooling method adopting carbon dioxide-water spray cooling

A carbon dioxide and water spray technology, which is applied in the field of secondary cooling of continuous casting billets, can solve the problem that the secondary cooling technology cannot meet the high-quality development requirements of continuous casting billets, and achieve the effects of reducing purification costs, reducing oxidation, and ensuring recycling.

Active Publication Date: 2019-04-05
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a secondary cooling method for continuous casting billets using carbon dioxide-water spray cooling to solve the problem that the existing secondary cooling technology cannot meet the high-quality development requirements of continuous casting billets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1. Using a billet continuous casting machine to produce a steel type is HRB400 continuous casting billet, and the section size is 150mm×150mm. Second cooling method comprises the following steps:

[0028] A. After the secondary combustion of the converter gas, pressurize it to 1.5Mpa through the compressor, and store it in the pre-storage gas cabinet, and then pass the gas in the pre-storage gas cabinet into the carbon dioxide separation equipment to separate the carbon dioxide gas. The purity (volume content) of the carbon dioxide gas produced is not less than 98%, and there is no residual carbon monoxide gas; the separated carbon dioxide gas is pressurized to 1.6MPa through a compressor and stored in a carbon dioxide gas cabinet;

[0029] B. Pressurize the water to 1.5MPa through the booster pump and store it in the high-pressure water tank;

[0030] C. The carbon dioxide gas in the carbon dioxide gas tank is transported to the gas distributor through the ...

Embodiment 2

[0034] Embodiment 2. A slab continuous casting machine is used to produce a steel grade of Q235 continuous casting slab with a section width of 220 mm and a length of 1350 mm. Second cooling method comprises the following steps:

[0035] A. After secondary combustion of the converter gas, pressurize it to 1.6Mpa through the compressor, and store it in the pre-storage gas cabinet, and then pass the gas in the pre-storage gas cabinet into the carbon dioxide separation equipment to separate the carbon dioxide gas. The purity (volume content) of the carbon dioxide gas produced is not less than 98%, and there is no residual carbon monoxide gas; the separated carbon dioxide gas is pressurized to 1.6MPa through a compressor and stored in a carbon dioxide gas cabinet;

[0036] B. Pressurize the water to 1.6MPa through the booster pump and store it in the high-pressure water tank;

[0037] C. The carbon dioxide gas in the carbon dioxide gas tank is transported to the gas distributor t...

Embodiment 3

[0041] Embodiment 3. The steel type produced by the slab continuous casting machine is SPHD continuous casting slab, the section width is 240mm, and the length is 1600mm. Second cooling method comprises the following steps:

[0042] A. After the secondary combustion of the converter gas, pressurize it to 1.2Mpa through the compressor, and store it in the pre-storage gas cabinet, and then pass the gas in the pre-storage gas cabinet into the carbon dioxide separation equipment to separate the carbon dioxide gas. The purity (volume content) of the carbon dioxide gas produced is not less than 98%, and there is no residual carbon monoxide gas; the separated carbon dioxide gas is pressurized to 1.6MPa through a compressor and stored in a carbon dioxide gas cabinet;

[0043] B. Pressurize the water to 1.6MPa through the booster pump and store it in the high-pressure water tank;

[0044] C. The carbon dioxide gas in the carbon dioxide gas tank is transported to the gas distributor th...

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Abstract

The invention discloses a continuous casting billet secondary cooling method adopting carbon dioxide-water spray cooling, belongs to the field of metallurgy, and solves the problem that an existing secondary cooling technology cannot meet the requirement for high quality developing of continuous cast steel billets. The method comprises the following steps that the carbon dioxide gas is pressurizedto 1.4-1.8 MPa through a compressor, and is stored in a carbon dioxide gas holder; the water is pressurized to 1.4-1.8 MPa through a booster pump, and is stored in a high-pressure water tank; the carbon dioxide gas in the carbon dioxide gas holder is conveyed to a gas distributor through a pipeline, and then is conveyed to a secondary cooling discharging tube by the gas distributor; the water inthe high-pressure water tank is conveyed to a water distributor through the pipeline, and then is conveyed to the secondary cooling discharging tube through the water distributor; and the mixed gas mist is sprayed to the surface of a casting blank of a secondary cooling zone through a atomizing nozzle on the secondary cooling discharge tube to cool the casting blank. According to the device, the oxidation layer on the surface of the casting blank is reduced, so that the metal yield is improved, and the water amount and the gas consumption of the secondary cooling water are reduced.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for secondary cooling of continuous casting steel slabs by using carbon dioxide-water spray cooling. Background technique [0002] In the process of steelmaking and continuous casting, after molten steel leaves the crystallizer, the primary slab shell enters the secondary cooling section, and continuous cooling is required to achieve the solidification of the liquid core inside the slab and obtain a qualified continuous casting slab. At present, most enterprises adopt water atomization or air-water spray cooling in the secondary cooling zone. The atomization cooling method is to mix high-pressure water or high-pressure water and high-pressure air in the nozzle through the nozzle, atomize the water into fine droplets, and spray it onto the surface of the slab to cool the slab. Especially after the compressed air and water are atomized, the water mist covers a large ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/124
CPCB22D11/1245
Inventor 魏国立武万明朱青德胡绍岩董德平
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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