Dimeit ironmaking method directly using coal for ironmaking and Dimeit furnace

Abstract

The invention discloses a dimeth iron making method for iron making by directly using coal, wherein an iron making furnace used by the method is a dimeth furnace; one path leading out coal gas passes through a gas dust collector, a gas pressure regulator, a gas removal CO2 device and a gas temperature regulator in turn, returns to the dimeth furnace and supplies a gas reducer for the dimeth furance, and the other path leading out the coal gas is supplied for a user; the cross section of the dimeth furnace is a circular or polygonous shaft furnace, and a cooler and a fire-retardant internal lining are arranged inside a furnace shell; more than two layers of furnace grills are arranged inside the dimeth furnace, and the inside of the dimeth furance is divided into three main spaces, namely a direct reducing chamber, a gas mixing chamber and a fusing and reducing chamber from the top down; and common oxygen supply blast tuyeres or common reducing and combustion-supporting raw material blowing openings or common special blowing openings are distributed on the circumference of the furnace on the lower part of the dimeth furnace. The method and equipment are suitable for the condition of mill coal resources and completely get rid of the dependency of iron making on coke.

Description

Technical field: [0001] The invention relates to a metal smelting technology in the metallurgical industry, in particular to a technology for smelting pig iron without using coke or using a small amount of coke together, which has a better iron-making effect. Background technique: [0002] The main production methods of iron are mainly divided into two categories, namely blast furnace ironmaking process and non-blast furnace ironmaking process. [0003] 1. So far, the traditional blast furnace ironmaking process is still the main production method of iron. Because the blast furnace ironmaking process has the advantages of mature technology, good economic indicators, high production efficiency, and low energy consumption, the iron produced by this method accounts for the vast majority of the world's total iron production. The whole process of reduction and melting of blast furnace process is completed in one reactor, with compact layout, high reduction efficiency and reasona...

AI Technical Summary

Problems solved by technology

The COREX process that has achieved industrial production still has too strict requirements on raw materials and fuels. The pre-reduction (direct reduction) and smelting reduction are completed in different containers, and the smelting reduction gas (intermediate gas) needs to be cooled and heated. The intermediate link Many, the process energy consumption is high, the investment per unit capacity has no obvious advantage compared with the traditional blast furnace ironmaking system, and the production cost of the product is lower than the expectation of the blast furnace molten iron, which still needs to be tested in production practice

Moreover, it has not been able to achieve full coal operation, and still needs to use some coke