A cyclone flash reduction direct steelmaking system and process

Abstract

A cyclone flash reduction direct steelmaking system and process. The system includes a carbon monoxide preparation device, a cyclone flash reduction furnace, an electrothermal melting furnace and tail gas post-treatment equipment. The tail gas post-treatment equipment includes a preheating / pre-reduction device. , tail gas dust removal and purification device, heat exchanger and tail gas separation device; the process is: electrochemical reduction of carbon dioxide to produce carbon monoxide and oxygen, sprayed into a cyclone flash reduction furnace with iron ore powder and flux, and reduced at 900 to 1500°C , obtain pre-reduced iron powder / iron droplets with a metallization rate of >70%, and enter the electric melting furnace for melting and final reduction. The reduction and smelting exhaust gases are sequentially preheated / pre-reduced iron ore powder and flux, dust removal, and preheating. The oxygen is then separated to obtain carbon monoxide and carbon dioxide, which are returned to the cyclone furnace and carbon dioxide reduction device for recycling respectively. This process uses electric energy for smelting and does not rely on fossil fuels. Carbon monoxide is recycled. There are no pollutants and carbon dioxide emissions in the process, achieving clean smelting.

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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