An Ironmaking Process Based on Injection of High Temperature Coal Gas

Abstract

The invention discloses a high-temperature gas injection-based iron-making technology and belongs to the field of black metallurgy. The high-temperature gas injection-based iron-making technology utilizes oxygen-rich normal-temperature air blasting to replace hot air operation, and high-temperature gas produced by a coal gasification device and CO2-free furnace top recycled gas are mixed and are respectively pumped into a blast furnace from the furnace body and the hearth so that furnace top recycled gas CO2 removal is realized. The high-temperature gas injection-based iron-making technology has a coal ratio of 240-350kg / tHM, a coal gasification unit coal-use amount of 50-250kg / tHM and a coke ratio of 180-260kg / tHM and a blast furnace capacity factor of 6.0-7.5, reduces operation costs of oxygen-containing blast furnace top gas CO2 removal and recycled gas pre-heating to a temperature of 900-1300 DEG C, realizes coke reduction and coal use increasing in blast furnace production, improves an iron-making technology energy structure and stabilizes gas balance of a steel enterprise.

Description

technical field [0001] The invention belongs to the field of ferrous metallurgy, relates to an ironmaking process based on injection of high-temperature gas, and is suitable for blast furnace ironmaking processes. Background technique [0002] At present, 90% of the pig iron in the world is produced by the traditional blast furnace ironmaking process. In the traditional blast furnace ironmaking process, the main fuel is coke and coal powder. The tuyeres inject hot air and coal powder. The traditional blast furnace ironmaking process requires the use of a large amount of coke, and coking not only requires a large amount of coking coal, but also produces a large amount of toxic and harmful substances during the coking process, which seriously pollutes the environment; the traditional blast furnace blast brings in a large amount of high-temperature inert gas N 2 , so that the proportion of CO in the furnace gas is less than 40%, and the degree of indirect reduction of iron ore...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to use the high-temperature coal gas produced by the coal gasification device in the oxygen blast furnace ironmaking process to solve the CO caused by the traditional blast furnace ironmaking process. 2 Large emissions, serious environmental pollution, low productivity and other issues; at the same time reduce or avoid CO removal from oxygen blast furnace top gas 2 and the cost of preheating circulating gas to 900-1300°C; at the same time, pulverized coal is injected into the hearth to adjust the theoretical combustion temperature

Images