Direct steelmaking system and process for electric energy all-hydrogen flash reduction

Abstract

The invention provides a direct steelmaking system and a process for electric energy all-hydrogen flash reduction, the system comprises an electrolysis water hydrogen production device, a cyclone flash reduction furnace, an electric heating melting furnace and a tail gas post-treatment device; the process is as follows: the reducing hydrogen and oxygen are prepared by water electrolysis, the oxygen and the steelmaking powder are sprayed into the cyclone flash reduction furnace, meanwhile, the lower part is blown with hydrogen, and reduction reaction occurs between the two phases of gas and solid at 500-1500 DEG C during the countercurrent movement in the cyclone furnace to obtain the pre-reduced iron powder / iron droplets with metallization ratio greater than 80%, and then the oxygen and the steelmaking powder enter the electric melting furnace to carry out melting separation, the bottom blowing hydrogen is stirred and molten to be reduced, continuous steelmaking is carried out, the tail gas preheating / pre-reduction powder is reduced and molten and subjected to dust removing purification, the purified exhaust gas preheats the oxygen and is condensed and separated, the hydrogen returns to the cyclone flash reduction furnace, and the condensed water returns to the electrolysis water to produce hydrogen; the process completely uses electric energy for smelting without relying on fossil fuel, completely uses hydrogen as a reducing agent, and has no pollutant emission in the process, so the efficient, recycling, and cleaning melting of raw materials are achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to an electric energy all-hydrogen 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 traditional blast furnace ironmaking process, sm...

AI Technical Summary

Problems solved by technology

[0005] To sum up, the current smelting reduction ironmaking / direct steelmaking method can achieve the emission reduction target 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 problem of energy consumption in the steel production process

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