Heating-pure hydrogen reduction cooling system and method

The technology of a cooling system and a cooling method is applied to a heating-pure hydrogen reduction cooling system. The embodiments are used to illustrate the principle field of the present invention, which can solve the problems such as the low utilization rate of hydrogen at the heating limit temperature, and achieve the temperature that eliminates the heating hydrogen. The effect of limiting, increasing the upper temperature limit, and improving the heating efficiency

Pending Publication Date: 2022-03-01
CENT IRON & STEEL RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a heating-pure hydrogen reduction cooling system and method to solve the problem of low hydrogen utilization rate due to the limitation of hydrogen heating limit temperature in the existing pure hydrogen shaft furnace reduction system

Method used

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  • Heating-pure hydrogen reduction cooling system and method
  • Heating-pure hydrogen reduction cooling system and method

Examples

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Effect test

Embodiment 1

[0084] in such as figure 1 The shown heating-pure hydrogen reduction cooling system is carried out. The 10kg oxidized pellets in the equal pressure charging system 9 enter the heating section 1 through the oxidized pellet inlet 4, and the combustion furnace 10 uses natural gas as fuel to heat the 1150°C heat Flue gas (H 2 The sum of the volume percentages of CO and CO is 7%, O 2 The volume percentage content is 0.4%) into the heating section 1 through the hot flue gas inlet 5, and the oxidized pellets and the hot flue gas are in countercurrent contact in the heating section 1, and the oxidized pellets are heated to 1000 ° C, and the smoke after the countercurrent contact The flue gas (temperature is 200°C) is discharged from the flue gas outlet 6 into the flue gas purification system 12 and then discharged after reaching the emission standard. The oxidized pellets after countercurrent contact enter the isobaric section 2 for isobaric transition and then enter the reduction co...

Embodiment 2

[0086] According to the method of Example 1, the difference is that in the heating section 1, the oxidized pellets are heated to 1050 °C, and the hydrogen circulation is 1062m 3 / DRI.

Embodiment 3

[0088] According to the method of Example 1, the difference is that the oxidized pellets are heated to 1100 °C in the heating section 1, and the hydrogen circulation is 1087m 3 / DRI.

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Abstract

The invention relates to a heating-pure hydrogen reduction cooling system and method, belongs to the technical field of shaft furnace reduction in the metallurgical process, and solves the problem of low hydrogen utilization rate in the prior art. The heating-pure hydrogen reduction cooling system comprises a heating section, an isobaric section and a reduction cooling section which are sequentially communicated from top to bottom; the heating section is provided with an oxidized pellet inlet, a hot flue gas inlet and a flue gas outlet, oxidized pellets from the oxidized pellet inlet are in contact with hot flue gas from the hot flue gas inlet in the heating section, the flue gas after contact is discharged from the flue gas outlet, and the oxidized pellets after contact enter the isobaric section; the reduction cooling section is provided with a hydrogen inlet and a gas outlet, oxidized pellets from the isobaric section and hydrogen from the hydrogen inlet are reduced and cooled in the reduction cooling section, and gas generated in the reduction and cooling process is discharged from the gas outlet. The hydrogen utilization rate is improved.

Description

[0001] The invention relates to the technical field of shaft furnace reduction, in particular to a heating-pure hydrogen reduction cooling system and method. Background technique [0002] Hydrogen metallurgy is an inevitable choice to achieve carbon reduction and zero carbon in the iron and steel industry. Hydrogen metallurgy can be divided into low-hydrogen metallurgy, hydrogen-rich metallurgy and pure hydrogen metallurgy according to the carbon reduction effect. Low-hydrogen metallurgy mainly uses hydrogen-rich or pure hydrogen gas to partially replace coke as a reducing agent in the blast furnace, and the carbon reduction limit is less than 20%; hydrogen-rich metallurgy mainly includes hydrogen-rich reduction in shaft furnaces and hydrogen-rich melting reduction, and the carbon reduction effect can reach 50-80%; pure hydrogen metallurgy is still in the stage of experimental development, generally the shaft furnace is used as the reactor, and pure hydrogen gas is used as the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02
CPCC21B13/02C21B13/0073C21B13/0046
Inventor 张俊周和敏郝晓东徐洪军王锋沈朋飞何鹏万新宇
Owner CENT IRON & STEEL RES INST
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