Method and device for smelting iron by using pure-oxygen and hydrogen-rich gas

Abstract

The invention relates to a method and a device for smelting iron by using a pure-oxygen and hydrogen-rich gas, which belong to the technical field of ironmaking and energy sources. The process for smelting iron by using a pure-oxygen and hydrogen-rich gas comprises the steps of: performing in-parallel coupling operation of coal carbonization, sintering, pelletizing and an iron-fining furnace; conveying and charging hot coke, agglomerate and pellets to the oxygen iron-fining furnace by conveying equipment and charging equipment at high temperature without cooling; and arranging an oxygen tuyere and a gas injection facility at the lower part of the furnace for blowing in oxygen and coke oven gas at a certain temperature towards the furnace to achieve the aims of energy conservation and emission reduction. The device comprises a raw material system, a stock gas system, a coke oven gas injection system, a dust injection system, a slag dry-method pelletizing and afterheat recovery system and an oxygen system. The method and the device have the advantages that: high-temperature furnace charges are adopted to enter the furnace directly, so that the investments of cooling equipment are saved, the layout is more compact, and the land resources and investments are saved; and the pure-oxygen and hydrogen-rich gas injection technology is adopted to achieve the effects of cleaner production, high efficiency, energy conservation, energy conservation and emission reduction.

Description

technical field [0001] The invention belongs to the technical field of ironmaking and energy, and in particular provides an ironmaking method with full oxygen and hydrogen-enriched gas and a device thereof, which realize hot delivery and hot charging of ironmaking raw materials and low-carbon hydrogen-rich full-oxygen ironmaking. Background technique [0002] With the continuous acceleration of the modern industrialization process, the global energy consumption is massive, and the carbon dioxide emission is increasing sharply. The resulting air pollution and greenhouse effect have seriously threatened the earth environment on which human beings depend for survival. Carbon dioxide emissions from China's iron and steel industry are second only to electricity and building materials, ranking third. Therefore, the reduction of carbon dioxide emissions is an unshirkable responsibility of the steel industry. The ironmaking system, whose energy consumption accounts for more than 70...

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Problems solved by technology

[0006] Blast furnaces have achieved good results in increasing production, saving coke and reducing consumption through high-oxygen enrichment and large coal injection. When the oxygen enrichment rate is further increased and pure oxygen smelting is performed, the amount of coal injection can be increased to the maximum and the coke ratio can be reduced, but with The problem is that the amount of blast furnace gas is insufficient, and the temperature of the upper part is low due to the cold material entering the furnace, which affects the indirect reduction of gas, resulting in an increase in the proportion of direct reduction, which increases the consumption of carbon.

Although the problem of insufficient heat in the upper part can be solved by the current popular technical idea, that is, blowing high-temperature gas into the lower part of the furnace body, due to the problem of carbon deposition in the heating process of the gas and the need to burn a certain amount of gas for heating the gas, Keep the technology at the thought stage

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