Cyclone flashing-speed reduction direct steelmaking system and process

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...

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 process emits a lot of greenhouse gases and pollutants , and the energy required for the production process comes from non-renewable resources such as fossil fuels, which cannot effectively solve the huge energy consumption problem in the steel production process

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