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A kind of full-oxygen blast furnace ironmaking method

A blast furnace ironmaking and blast furnace technology, which is applied in the field of optimized ironmaking of all-oxygen blast furnaces, can solve the problems of reducing, affecting the smoothness of the charge, and cooling and heating in the blast furnace, so as to reduce environmental pollution, improve gas quality, and reduce the use of coke. Effect

Active Publication Date: 2018-09-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the amount of gas flowing to the upper part of the blast furnace has been greatly reduced compared with before, the heat brought into the upper part of the blast furnace has been greatly reduced, resulting in the problem of upper cooling and lower heating of the blast furnace, which affects the smoothness of the charge.

Method used

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  • A kind of full-oxygen blast furnace ironmaking method

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Effect test

Embodiment 1

[0023] An all-oxygen blast furnace ironmaking method, comprising the steps of:

[0024] Pure oxygen, pulverized coal and high-temperature upgraded gas are injected into the all-oxygen blast furnace, ore and coke are added to the top of the furnace, and the top gas is passed into the gas upgrading heating furnace to remove the CO in the top gas. 2 Converted into CO to form high-temperature upgraded gas, which is then injected into the all-oxygen blast furnace.

[0025] The full-oxygen blast furnace ironmaking equipment includes a full-oxygen blast furnace and a gas-upgrading heating furnace. On the hearth of the full-oxygen blast furnace, an oxygen blast port, a coal injection port, and a lower upgrading gas inlet are annularly arranged. An upper upgraded gas inlet is provided, the distance between the lower upgraded gas inlet and the upper upgraded gas inlet is L, and the distance between the upper upgraded gas inlet and the furnace roof is L', wherein L: L' is 0.8:1.6, the i...

Embodiment 2

[0033] like figure 1 Shown:

[0034] The main equipment of the full-oxygen blast furnace ironmaking includes the full-oxygen blast furnace and the gas-upgrading heating furnace. On the hearth of the full-oxygen blast furnace, an oxygen blast port, a coal injection port and a lower upgrading gas inlet are arranged circularly. There is an upper upgraded gas inlet, the distance between the lower upgraded gas inlet and the upper upgraded gas inlet is L, and the distance between the upper upgraded gas inlet and the furnace roof is L', where L: L' is 0.9 : 1.9, the included angle between the upper upgraded gas inlet and the lower part of the outer wall of the furnace body is α, and the included angle of α is 112°. Coal pulverized, the lower upgraded gas inlet and the upper upgraded gas inlet are used to blast high-temperature upgraded gas produced from the gas upgrading heating furnace. The top gas is discharged from the top of the all-oxygen blast furnace, and the top gas conduit...

Embodiment 3

[0037] An all-oxygen blast furnace ironmaking method, comprising the following steps and setting methods:

[0038] (1) Pure oxygen, coal powder and high-temperature upgrading gas are injected into the all-oxygen blast furnace, ore and coke are added to the top of the furnace, and the top gas is passed into the gas upgrading heating furnace to remove the CO in the top gas 2 Converted into CO to form high-temperature upgraded gas, which is then injected into the all-oxygen blast furnace.

[0039] (2) The equipment for the full-oxygen blast furnace ironmaking includes a full-oxygen blast furnace and a gas-upgrading heating furnace. On the full-oxygen blast furnace hearth, an oxygen blast port, a coal injection port and a bottom upgrading gas inlet are annularly arranged. The lower part of the body is provided with an upper upgraded gas inlet, the distance between the lower upgraded gas inlet and the upper upgraded gas inlet is L, and the distance between the upper upgraded gas in...

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Abstract

The invention relates to an all-oxygen blast furnace iron-making method. Main equipment for implementing such iron-making method includes an all-oxygen blast furnace and a coal gas quality-elevating and heating furnace, wherein a hearth of the all-oxygen blast furnace is provided with an oxygen blower nozzle, a coal injection nozzle and a lower quality-elevating coal gas inlet circumferentially, an upper quality-elevating coal gas inlet is formed in the lower middle of a shaft of the blast furnace, and the coal gas quality-elevating and heating furnace comprises an upper internal tube, a lower external tube, a reaction chamber and a liquid slag chamber. The all-oxygen blast furnace iron-making method has the advantages that through improvement in the main equipment and specific process parameters, the utilization rate of coke is decreased substantially, the utilization rate of top gas is increased significantly, and accordingly technological parameters in an iron-making process are improved.

Description

technical field [0001] The invention belongs to the field of optimized ironmaking in an all-oxygen blast furnace, and in particular relates to a method for upgrading and recycling hydrogen-rich gas to make iron in an all-oxygen blast furnace. Background technique [0002] The most conventional process in the modern iron and steel smelting process is blast furnace ironmaking + hot metal pretreatment + converter steelmaking + continuous casting. Among them, blast furnace ironmaking uses iron ore and coke as the main raw materials, and coke is used as the main reducing agent and forms the internal skeleton of the blast furnace to reduce the iron ore raw materials that enter the blast furnace at the top. However, coking pollutes the environment extremely seriously. With the gradual improvement of environmental awareness, reducing the amount of coke used in the ironmaking process has become a very urgent technical need. Existing blast furnaces usually blow air at the lower part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00C21B5/06
CPCC21B5/003C21B5/008C21B5/06Y02P10/25
Inventor 佘雪峰王静松薛庆国左海滨
Owner UNIV OF SCI & TECH BEIJING