Cyclone flashing-speed reduction direct steelmaking system and process

A flash and whirlwind technology, applied in the field of iron and steel metallurgy, can solve the problems of large emissions of greenhouse gases and pollutants, and the inability to effectively solve the energy consumption of iron and steel, so as to realize resource utilization, alleviate energy shortage, and simplify the steelmaking process Effect

Active Publication Date: 2019-11-12
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, the current smelting reduction ironmaking/direct steelmaking method can achieve the emission reduction goal of steel production to a certain extent, but its smelting process still relies on coal-based reducing agents, and the reduction proce

Method used

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  • Cyclone flashing-speed reduction direct steelmaking system and process
  • Cyclone flashing-speed reduction direct steelmaking system and process

Examples

Experimental program
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Effect test

Embodiment 1

[0064] A cyclone flash reduction direct steelmaking process adopting the above-mentioned system and process, the process parameters involved in each step are specifically as follows:

[0065] Step 1. Feed carbon dioxide into the carbon dioxide reduction reactor for electrochemical reduction to obtain pure carbon monoxide and oxygen, the purity of carbon monoxide is >99%, and the purity of oxygen is >99%;

[0066] Step 2. Add iron ore powder and flux powder to the preheating / pre-reduction device. The iron ore powder has a total iron TFe content of 50wt%, and the average particle size is 2mm. Iron ore powder and flux powder are blown into the cyclone together with preheated oxygen Flash reduction furnace, in which the mass ratio of iron ore powder to oxygen is 1:3, carbon monoxide is blown in, the volume ratio of carbon monoxide nozzle injection volume to oxygen injection volume is 100:3, and the temperature inside the reduction furnace is controlled at 900-1500 ℃; powder and ca...

Embodiment 2

[0070]A cyclone flash reduction direct steelmaking process adopting the above-mentioned system and process, the process parameters involved in each step are specifically as follows:

[0071] Step 1. Feed carbon dioxide into the carbon dioxide reduction reactor for electrochemical reduction to obtain pure carbon monoxide and oxygen, the purity of carbon monoxide is >99%, and the purity of oxygen is >99%;

[0072] Step 2. Add iron ore powder and flux to the preheating / pre-reduction device. The iron ore powder has a total iron TFe content of 60wt% and an average particle size of 1mm. The iron ore powder and flux powder are blown into the cyclone flash together with the preheated oxygen Rapid reduction furnace, in which the mass ratio of iron ore powder to oxygen is 1:5, carbon monoxide is blown in, the volume ratio of carbon monoxide nozzle injection volume to oxygen injection volume is 100:5, and the temperature inside the reduction furnace is controlled at 900-1500°C ; The powd...

Embodiment 3

[0076] A cyclone flash reduction direct steelmaking process adopting the above-mentioned system and process, the process parameters involved in each step are specifically as follows:

[0077] Step 1. Feed carbon dioxide into the carbon dioxide reduction reactor for electrochemical reduction to obtain pure carbon monoxide and oxygen, the purity of carbon monoxide is >99%, and the purity of oxygen is >99%;

[0078] Step 2. Add iron ore powder and flux to the preheating / prereduction device. The iron ore powder has a total iron TFe content of 68wt% and an average particle size of 0.5mm. The iron ore powder and flux powder are blown into the cyclone together with the preheated oxygen Flash reduction furnace, in which the mass ratio of iron ore powder to oxygen is 1:9, carbon monoxide is blown in, the volume ratio of carbon monoxide nozzle injection volume to oxygen injection volume is 100:9, and the temperature in the reduction furnace is controlled at 900-1500 ℃; powder and carbon...

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Abstract

The invention relates to cyclone flashing-speed reduction direct steelmaking system and process. The system comprises a carbon monoxide preparation device, a cyclone flashing-speed reduction furnace,an electric heating smelting separation furnace and a tail gas aftertreatment device. The tail gas aftertreatment device comprises a preheating/pre-reduction device, a tail gas dedusting and purifyingdevice, a heat exchanger and a tail gas separating device. The process comprises the steps of carrying out electrochemical reduction on carbon dioxide to prepare carbon monoxide and oxygen; sprayingthe carbon monoxide, the oxygen, iron ore powder and a flux into the cyclone flashing-speed reduction furnace, carrying out reduction at 900 to 1500 DEG C, and obtaining pre-reduced iron powder/iron drops with the metallization ratio being larger than 70 percent; entering the electric heating smelting separation furnace so as to carry out smelting separation and final reduction; sequentially preheating/pre-reducing the iron ore powder and the flux through reduced and smelted tail gas, dedusting, preheating the oxygen, and separating to obtain carbon monoxide and carbon dioxide; and returning to a cyclone furnace and a carbon dioxide reduction device for recycling. According to the process, electric energy is utilized for smelting, the process does not rely on fossil fuels, the carbon monoxide is recycled, no pollutant and carbon dioxide is discharged in the process, and clean smelting is realized.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, relates to a non-blast furnace ironmaking process, in particular to a cyclone flash reduction direct steelmaking system and process. Background technique [0002] Sintering→blast furnace→converter is the main process of crude steel production at present. This process integrates four process links of sintering (or pelletizing), coking, blast furnace ironmaking and converter steelmaking. It has long production process, high energy consumption and strong dependence on fossils. Fuel resources and serious environmental pollution and other shortcomings. At a time when global environmental pollution and resource and energy shortages are intensifying, energy conservation, emission reduction, and clean production have become the only way for the sustainable development of the global steel industry. [0003] Aiming at the problems of high pollution and high energy consumption in the trad...

Claims

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Application Information

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IPC IPC(8): C21B13/00C25B1/00
CPCC21B13/0006C21B13/0073C21B13/008C25B1/00C21B2100/66Y02P10/20Y02P20/129
Inventor 李琳李明明杨星邹宗树邵磊李强
Owner NORTHEASTERN UNIV
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