Method and device for indirect heating type reduction iron making

Abstract

The invention provides a method and a device for indirect heating type reduction iron making. The device comprises a gasification preheating furnace, a muffle reduction furnace, a smelting furnace, a gas treatment device and an exhaust system, wherein the interior part of the gasification preheating furnace comprises a smoke channel and a preheating chamber, the preheating chamber is formed by a conducting wall, and the space between the preheating chamber and the preheating chamber wall is the smoke channel; the muffle reduction furnace is divided into a reduction chamber and a combustion chamber by a conducting wall, and the space between the muffle reduction chamber wall and the conducting wall is the combustion chamber. The material of the conducting walls is silicon carbide bricks orhigh-alumina bricks and the like. A reduced material in the gasification preheating furnace is conveyed through material conveying equipment, heating smoke is conveyed through a smoke pipeline, and coal gas is conveyed through a coal gas pipeline. In the invention, the smoke indirectly heats the reduced material through the conducting walls of the gasification preheating furnace and the muffle reduction furnace, the reduction process is accompanied with the gasification of coal or other fuels, and the produced coal gas is used for combustion heating. Thus, the quality of the reduced product is improved, and energy resources are saved.

Description

technical field [0001] The invention belongs to the technical field of reduction ironmaking, and relates to a reduction ironmaking method and device, in particular to a reduction ironmaking method and device in which raw materials and reducing agents are indirectly heated, and the reduction process and coal gasification are carried out simultaneously. Background technique [0002] Reduction 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. , low construction investment, low production cost and other advantages, it is widely optimistic about the field 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 the COREX ...

AI Technical Summary

Problems solved by technology

However, the process is intermittently operated, and after the reduction of one furnace is completed, another furnace is added for reduction, and the production efficiency is limited. On the other hand, the reduced material is directly heated and reduced, which is easy to be polluted by smoke and dust, which affects the quality of the reduced product.

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