Production apparatus and method for iron making

Abstract

The invention relates to a production apparatus and method for iron making. The device comprises a rotary kiln, a gasification heating furnace, an iron fine powder preheater, a tail gas heater and a CO2 recovery device. A tail gas outlet of the rotary kiln is divided into two paths, one path is connected to the gasification heating furnace through a pipe pass of the tail gas heater and an ejector,and the other path is connected to a tail gas combustion nozzle. A shell pass outlet of the tail gas heater is divided into two paths through the iron fine powder preheater, one path is connected tothe CO2 recovery device, and the other path is connected to an ejection gas inlet of the ejector. A circulating CO outlet of the gasification heating furnace is connected to a circulating CO inlet ofthe rotary kiln through a CO circulating pipeline. Pulverized coal and pure oxygen are not completely burned in the gasification heating furnace to generate CO, and the circulating CO enters the rotary kiln to heat materials for reduction iron making. By means of the production apparatus and method, the gasification heating furnace and the rotary kiln are combined, the high-temperature circulatingCO obtained by coal gasification enters the rotary kiln for melting iron making, the utilization rate of coal-fired heat energy is improved, and the coal-fired consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and chemical production, and relates to a production device and method for ironmaking. [0002] technical background [0003] Ironmaking is an important part of iron and steel production. Its main feature is to use non-coking coal as a primary energy source and reducing agent to reduce iron oxides in a molten state. It has the advantages of using coal instead of coke, short process, and less environmental pollution. The advantages of low construction investment and low production cost are widely favored fields in the industry, and iron and steel enterprises in various countries are competing to carry out research and development. The existing reducing ironmaking methods mainly include COREX method (CN1010323B), DIOS method (CN1035136A), and HISELT method (CN1037542A). Among them, the COREX method has been produced industrially, and the other two methods are still in the experimental stage. How...

AI Technical Summary

Problems solved by technology

This technology overcomes the disadvantages of slow blast furnace ironmaking speed, high heat dissipation, the need to use a large amount of coke and sintered ore, and the inability to use pulverized coal and fine ore

However, the reduction and heating process of this patent application is carried out in a rotary kiln. Harmful components in coal powder and flue gas during the reduction process are easy to enter the reduced iron, affecting the quality of reduced ironmaking, and the waste heat cannot be effectively used, increasing the reduction of ironmaking. the cost of

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