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Composite system and method for converter flue gas treatment and reduction of all-vanadium-titanium pellets

A converter flue gas and composite system technology is applied in the field of iron and steel metallurgy production, which can solve the problems of physical heat and chemical latent heat loss, large consumption and high emission rate, and achieve the effect of saving energy consumption, production cost and fast process.

Active Publication Date: 2020-07-17
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Japan is one of the countries with the highest utilization rate of gas resources in the world, while the average gas recovery rate of most enterprises in my country is low, the consumption is large and the emission is serious
The concentration and calorific value of CO in the converter flue gas are high, but the emission rate is also high, and the value brought by its physical heat and chemical latent heat is greatly lost every year. It is necessary to comprehensively recycle the flue gas as a resource.

Method used

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  • Composite system and method for converter flue gas treatment and reduction of all-vanadium-titanium pellets
  • Composite system and method for converter flue gas treatment and reduction of all-vanadium-titanium pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] After the high-temperature flue gas (1400°C) produced by the steelmaking converter is vaporized and cooled and the high-temperature cyclone dust is removed, the temperature of the flue gas is reduced to 900°C, and the dust is reduced from 100g / Nm 3 Reduced to 10g / Nm 3 . After the CO concentration automatic detector, the concentration of CO in the flue gas is 20%, and the flue gas is passed into the gas-based reduction shaft furnace at a rate of 2.5L / min, and the chromium-containing all-vanadium-titanium pellets in the gas-based reduction shaft furnace The ore undergoes a reduction reaction for 30 minutes. After the reaction is completed, the flue gas is introduced from the gas outlet of the gas-based reduction shaft furnace to the convective heat exchanger for the next step of treatment. The reduction rate of chromium-containing all-vanadium-titanium pellets was measured to be 68.34%.

Embodiment 2

[0063] After the high-temperature flue gas (1500°C) produced by the steelmaking converter is vaporized and cooled and the high-temperature cyclone dust is removed, the flue gas temperature is reduced to 950°C, and the dust is reduced from 80g / Nm 3 Reduced to 8g / Nm 3 . After the CO concentration automatic detector, the concentration of CO in the flue gas is 30%, and the flue gas is passed into the gas-based reduction shaft furnace at a rate of 3L / min, and the chromium-containing all-vanadium-titanium pellets in the gas-based reduction shaft furnace Carry out the reduction reaction for 30 minutes. After the reaction is completed, the flue gas is introduced from the gas outlet of the gas-based reduction shaft furnace to the convective heat exchanger for the next step of treatment. The reduction rate of chromium-containing all-vanadium-titanium pellets was measured to be 77.21%.

Embodiment 3

[0065] After the high-temperature flue gas (1600°C) produced by the steelmaking converter is vaporized and cooled and the high-temperature cyclone dust is removed, the temperature of the flue gas is reduced to 1000°C, and the dust is reduced from 60g / Nm 3 Reduced to 5g / Nm 3 . After the CO concentration automatic detector, the concentration of CO in the flue gas is 40%, and the flue gas is passed into the gas-based reduction shaft furnace at a rate of 4L / min, and the chromium-containing all-vanadium-titanium pellets in the gas-based reduction shaft furnace Carry out the reduction reaction for 30 minutes. After the reaction is completed, the flue gas is introduced from the gas outlet of the gas-based reduction shaft furnace to the convective heat exchanger for the next step of treatment. The reduction rate of the chromium-containing all-vanadium-titanium pellets was measured to be 92.34%.

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Abstract

The invention belongs to the technical field of iron and steel metallurgical production, and in particular relates to a composite system and method for treating converter flue gas and reducing all-vanadium titanium pellets. Collect the high-temperature flue gas discharged from the top of the steel-making converter. After dust removal, the CO concentration in the flue gas is detected in real time. When the CO volume concentration in the flue gas is detected to be less than 40%, the flue gas is passed into the gas-based reduction The chromium-containing all-vanadium titanium pellets are reduced in the shaft furnace. The flue gas coming out of the gas-based reduction shaft furnace is stored in a gas storage cabinet for user use after waste heat recovery, impurity removal and drying. The system of the present invention makes full use of by-product resources in steel enterprises, and utilizes converter flue gas in the reduction process of vanadium-titanium magnetite, which greatly reduces production costs, shortens production cycles, improves production efficiency, achieves energy conservation and emission reduction, and integrates resources. The big cycle of utilization.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgical production, and in particular relates to a composite system and method for treating converter flue gas and reducing all-vanadium-titanium pellets. Background technique [0002] For the smelting of all-vanadium-titanium magnetite, the current blast furnace-converter process cannot solve a series of problems brought about by high-titanium slag, and the valuable components in it cannot be well utilized. Therefore, it is necessary to aim at the high-efficiency smelting of all-vanadium-titanium-magnetite, and study the new gas-based direct reduction process for the metallization reduction of all-vanadium-titanium pellets and the efficient separation of valuable components. [0003] Compared with the traditional coal-based direct reduction, the gas-based direct reduction of the shaft furnace is more energy-saving and emission-reducing, and at the same time avoids the pollution of co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/38C21C5/40C21B13/02
Inventor 薛向欣宋翰林张金鹏杨合程功金黄壮
Owner NORTHEASTERN UNIV LIAONING
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