Self-developed COREX smelting furnace and hydrogen-carbon-rich circulating blast furnace coupled production system

Abstract

The invention discloses a hydrogen-carbon-rich circulating blast furnace and self-developed COREX smelting furnace coupled production process. The hydrogen-carbon-rich circulating blast furnace adopts oxygen-fuel combustion, furnace top gas mainly comprises CO, H2, CO2 and H2O, and a hydrogen-carbon-rich circulating blast furnace and self-developed COREX smelting furnace coupled production system comprises the hydrogen-carbon-rich circulating blast furnace and a self-developed COREX smelting furnace gas making system; furnace top self-developed COREX smelting furnace gas of the self-developed COREX smelting furnace gas making system is subjected to dust removal, pressure reduction and temperature reduction, passes through a CO2 removal device and a CO2 analysis device and then is conveyed to a coal injection system through a pipeline to replace nitrogen to be used as inert gas; part of the CO2-removed reducing gas is self-used and recycled by the self-developed COREX smelting furnace, the other part of the CO2-removed reducing gas is heated to about 900 DEG C by a heating system after being pressurized by a reducing gas pipeline and a compressor, and the CO2-removed reducing gas of the self-developed COREX smelting furnace is blown to the hydrogen-rich carbon circulating blast furnace through a tuyere blowing pipeline and a gas pipeline at the lower part of a furnace body of the hydrogen-rich carbon circulating blast furnace; and the purpose of coupling the hydrogen-rich carbon circulating blast furnace and the self-developed COREX smelting furnace is achieved.

Description

technical field [0001] The invention belongs to the field of low-carbon metallurgy. Specifically, the invention relates to a production system coupled with a hydrogen-rich carbon circulation blast furnace and an Ouye furnace. Background technique [0002] my country's iron and steel industry consumes a lot of resources, and the traditional blast furnace ironmaking technology with coke as the main raw material has achieved great development in terms of production efficiency and energy utilization. More than 90% of the world's pig iron production is produced by the traditional blast furnace ironmaking process. The traditional blast furnace ironmaking process blasts hot air at a temperature of 1000-1300°C into the blast furnace through a hot blast stove. The coke in the area and the injected coal powder are burned to produce gas that moves upwards and undergoes complex heat exchange and reduction reactions with the descending ore to obtain pig iron. The coke ratio is usually 3...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a production system in which the Ouye furnace is coupled with the hydrogen-rich carbon circulation blast furnace. In order to solve the problem of insufficient heat in the furnace shaft of the hydrogen-rich carbon circulation blast furnace and reduce fuel consumption, the preheated Ouye furnace...

Images