Equipment for directly making steel by using fine ore and coal oxygen

Abstract

The invention relates to equipment for directly making steel by using fine ore and coal oxygen, comprising fine ore milling equipment, fine ore lifting equipment, a multi-stage cyclone pre-heater, a pre-reduction circulating fluidized bed, a final-reduction circulating fluidized bed, a direct steel making furnace, fine ore spraying equipment, a bottom-blow or side-blow coal oxygen gun, a first gas exchanger, a second gas exchanger, a third gas exchanger, a fourth gas exchanger, gas supercharging equipment, gas purifying equipment and gas CO2 and H2O removing equipment; the discharge port of the fine ore milling equipment is connected with the feed port of the fine ore lifting equipment; the discharge port of the fine ore lifting equipment is connected to the feed port of the multi-stage cyclone pre-heater; the discharge port of the multi-stage cyclone pre-heater is connected with the feed port of the pre-reduction circulating fluidized bed; the discharge port of the pre-reduction circulating fluidized bed is connected with the feed port of the final-reduction circulating fluidized bed; the final-reduction circulating fluidized bed is connected with the direct steel making furnace by the fine ore spraying equipment; and the bottom-blow or side-blow coal oxygen gun is inserted into the bottom part or the side of the direct steel making furnace.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a device for directly making steel with powdered ore and coal oxygen. Background technique [0002] The most important and common iron and steel production process at present is also called the long process. In this process, to obtain molten steel from iron ore, it needs to go through four main processes: sintering (or pelletizing), coking, blast furnace ironmaking, and converter steelmaking. In addition, there are many auxiliary process links. The reduction of more than 70% of iron ore in blast furnace ironmaking is indirect reduction, which is a gas-solid reaction, and the blast furnace is required to maintain good air permeability. For use in blast furnaces, it must go through the sintering (or pelletizing) process. The material handling capacity of sintering (or pelletizing) accounts for about the second place in iron and steel complexes (after ironmaking production), a...

AI Technical Summary

Problems solved by technology

[0004] The smelting reduction-converter process has changed the reliance on coke in the traditional long process. For example, the COREX smelting reduction ironmaking-converter process only requires a small amount of coke. In principle, it only divides the function of the blast furnace into two, first the gaseous indirect reduction Melting and separation, but its disadvantages are also obvious: high oxygen consumption (500m 3 / t), the investment is 10% to 20% higher than the traditional long process, and the development speed is slow

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