Direct reduction process for producing sponge iron by using coke oven gas

Abstract

The invention discloses a direct reduction process for producing sponge iron by using coke oven gas. The process comprises the following steps: a, introducing the purified and pressurized coke oven gas into a gas humidifier for humidification; b, introducing the humidified coke oven gas into a gas heating system for heating; and c, introducing the heated coke oven gas into a low-pressure shaft furnace for reducing the iron ore and generating the furnace top gas of the shaft furnace. According to the process, by utilizing the catalytic action of the fresh sponge iron reduced in the low-pressure shaft furnace and utilizing carburization reaction of sponge iron and CH4, CH4 in the coke oven gas is transformed and modified so as to generate CO and H2, thereby avoiding the investment of an external reforming furnace and the consumption cost of a Ni-based noble metal catalyst and the like; by using the low-pressure shaft furnace, the problems of high pressure equipment, high pressure seal and the like of a high pressure shaft furnace can be avoided, and simultaneously, the limitation of H2 / CO can be relaxed, so that the investment, operation and flexibility of the process are greatly improved; and in the process, the heat energy of the furnace top gas of the shaft furnace can be fully recycled, and operation cost is low.

Description

technical field [0001] The invention relates to an ironmaking process, in particular to a process for producing sponge iron by using coke oven gas produced in a coking plant. Background technique [0002] The iron and steel industry is the basic industry of the national economy, and it is also a key industry in my country's energy resource consumption and pollution discharge. In order to speed up structural adjustment and industrial upgrading of the iron and steel industry, change the development mode of the iron and steel industry, and promote economical, clean and sustainable development, the state proposed in the "Steel Industry Adjustment and Revitalization Plan" to "strengthen non-blast furnace smelting-steelmaking, refining-direct Rolling new process clean process technology research and development and testing" as a key task to promote energy conservation and emission reduction in the whole industry, fully promote clean production. [0003] As a typical non-blast fur...

AI Technical Summary

Problems solved by technology

[0007] To sum up, the technological process of producing sponge iron from coke oven gas proposed at home and abroad has its own defects and deficiencies, and further improvement is needed if it is to be industrialized

Images