High-wind-temperature rotational flow injection disturbance melting reduction and prereduction combination device and method

Abstract

The invention discloses a high-wind-temperature rotational flow injection disturbance melting reduction and prereduction combination device and a method, which belong to the technical field of melting reduction. The device comprises a raw material system, a furnace top material charging and distributing system, a melting reduction furnace, a furnace top high-temperature gas system, a prereduction furnace, a semicoke gas recycling system, a coal dust preparing and spraying system, a molten iron desulfurizing agent preparing and jetting device, an oxygen and nitrogen supplying system, a residual iron treating system, a high-wind-temperature hot blast furnace, a melting reduction furnace blower, a furnace top gas dedusting and recycling system and a gas cogeneration device. The method comprises the following steps of: introducing high-temperature gas which is generated in a high-wind-temperature rotational flow injection disturbance melting reduction furnace into the prereduction furnace; directly reducing an iron-containing raw material in a solid phase state into a prereduction furnace material with a certain metallization rate; cooling, and then adding the cooled material and semicoke which serve as the furnace material and a fuel respectively into the melting reduction furnace; and finally producing molten iron by reduction. The device and the method have the advantages of high production efficiency and low energy consumption, are easy to operate and make industrialization easily realized.

Description

technical field [0001] The invention belongs to the technical field of smelting reduction, and in particular provides a combined device and method for high wind temperature swirl jet disturbance smelting reduction and pre-reduction. Background technique [0002] With the rapid development of my country's iron and steel industry, the demand for coking coal is also increasing. By the end of this century, my country's coking coal resources will be overwhelmed and unable to meet the requirements of steel production capacity. Blast furnace ironmaking that relies on coke production will not be able to achieve sustainable development. Therefore, the development and utilization of non-coking coal ironmaking process is an inevitable trend for the sustainable development of the iron and steel industry. [0003] Non-coking coal ironmaking technology refers to various process methods that do not use coke for metallurgical production process. According to product type and application, i...

AI Technical Summary

Problems solved by technology

Because the process uses oxygen ironmaking, the oxygen consumption is large, and the investment cost of oxygen equipment is high

[0011] (3) Hismelt process requires a high secondary combustion rate in the upper part of the final reduction furnace, and a high reduction potential for the slag and iron phase in the lower part of the molten pool, resulting in high-temperature, high-FeO foam slag, which strongly corrodes the lining of the final reduction furnace ; The spray gun for injecting ore powder and coal powder has a short service life

The process needs to be developed and improved

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