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A kind of blast furnace oxygen-enriched cyclic combustion method and system for ironmaking

A cycle combustion and blast furnace technology, applied in blast furnaces, blast furnace details, blast furnace parts, etc., can solve the problems of stable oxygen concentration in pure oxygen smelting iron, carbon capture in iron smelting process, etc., and achieve the effect of reducing carbon emissions

Active Publication Date: 2022-08-05
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] This application provides a method and system for blast furnace oxygen-enriched circular combustion ironmaking to solve the problem of carbon capture in the ironmaking process in the prior art and the stability of oxygen concentration in the process of pure oxygen ironmaking

Method used

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  • A kind of blast furnace oxygen-enriched cyclic combustion method and system for ironmaking
  • A kind of blast furnace oxygen-enriched cyclic combustion method and system for ironmaking
  • A kind of blast furnace oxygen-enriched cyclic combustion method and system for ironmaking

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Experimental program
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Effect test

Embodiment 1

[0133] It is determined that the first mixing, the second mixing and the carbon increase treatment are required,

[0134] The pressure of the first mixing was 3.3 MPa, and the pressure of the second mixing was 0.4 MPa.

[0135] The temperature of the first hot air and the second hot air was 1300°C.

[0136] In terms of volume fraction, both the first hot air and the second hot air include: O 2 : 25%, the rest is CO 2 .

Embodiment 2

[0138] Embodiment 2 and embodiment 1 are compared, and the difference between embodiment 2 and embodiment 1 is:

[0139] It is determined that the first mixing, the second mixing and the carbon increase treatment are required,

[0140] The pressure of the first mixing was 2.1 MPa, and the pressure of the second mixing was 0.3 MPa.

[0141] The temperature of the first hot air and the second hot air was 1200°C.

[0142] In terms of volume fraction, both the first hot air and the second hot air include: O 2 : 21%, the rest is CO 2 .

Embodiment 3

[0144] Embodiment 3 and embodiment 1 are compared, and the difference between embodiment 3 and embodiment 1 is:

[0145] It is determined that the first mixing, the second mixing and the carbon increase treatment are required,

[0146] The pressure of the first mixing was 4.2 MPa, and the pressure of the second mixing was 0.5 MPa.

[0147] The temperature of the first hot air and the second hot air was 1200°C.

[0148] In terms of volume fraction, both the first hot air and the second hot air include: O 2 : 30%, the rest is CO 2 .

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Abstract

The present application relates to the technical field of blast furnace ironmaking, and in particular to a method and system for blast furnace oxygen-enriched cyclic combustion ironmaking, the method comprising: obtaining first blast furnace gas for blast furnace ironmaking; preparing hot blast furnace raw material gas; and performing first mixing , obtain the first hot air; obtain the first oxygen content and the target oxygen content of the first hot air; according to the first oxygen content and the target oxygen content, determine whether the second mixing is required; if so, according to the first oxygen content and The target oxygen content is calculated, and the second mixing amount is calculated; according to the second mixing amount, the second mixing is carried out to obtain the second hot air; The system includes a dust removal device, a first mixing device, a hot blast stove, a pure oxygen tank, a second mixing device, a blast furnace, a gas outlet, a carbon dioxide gas storage tank and a controller; through the above method and system, a low carbon blast furnace ironmaking process can be realized. Emissions and oxygen concentrations are stable.

Description

technical field [0001] The present application relates to the technical field of blast furnace ironmaking, and in particular, to a method and system for blast furnace oxygen-enriched cyclic combustion ironmaking. Background technique [0002] In the traditional blast furnace ironmaking process, after the air is heated in a regenerative hot blast furnace, the hot air temperature exceeds 1200 °C and is transported to the blast furnace to provide heat and oxygen for the ironmaking process. 2 , in conventional blast furnace gas, N 2 The volume fraction is about 55% to 60%, which will lead to the following 2 problems: [0003] (1) The quality of traditional blast furnace gas is low, which is not conducive to subsequent utilization; [0004] (2)N 2 It is difficult to separate, which is not conducive to carbon capture in the ironmaking process, resulting in excessive carbon emissions. [0005] In view of the above problems, there are some blast furnace ironmaking processes that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/06C21B7/00
CPCC21B5/001C21B5/06C21B7/00Y02P10/122
Inventor 张立麒张泽武罗聪李小姗邬凡郑楚光
Owner HUAZHONG UNIV OF SCI & TECH
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