Gas-based reduction shaft furnace for low-intensity pellets

Abstract

Disclosed is a gas-based reduction shaft furnace for low-intensity pellets. The gas-based reduction shaft furnace comprises a shaft furnace body, a cooling assembly and pressure-bearing flow separation assemblies. A feeding chamber, a reduction chamber and a cooling chamber are defined in the shaft furnace body from top to bottom. The feeding chamber comprises a material inlet and a furnace top gas outlet. The reduction chamber comprises a reducing gas inlet. The cooling chamber comprises a reduced product outlet. The cooling assembly is installed on the outer wall of the cooling chamber. The pressure-bearing flow separation assemblies are in a cone or pyramid shape, and include first pressure-bearing flow separation assemblies and second pressure-bearing flow separation assemblies, wherein the first pressure-bearing flow separation assemblies are installed in the reduction chamber, and the second pressure-bearing flow separation assemblies are installed in the cooling chamber. According to the gas-based reduction shaft furnace for the low-intensity pellets, the provided pressure-bearing flow separation assemblies are beneficial to reduce the requirement of the gas-based reduction shaft furnace for the compressive strength of oxidized pellets or lump ore entering the furnace, various kinds of low-density iron ore can be processed, and the industrial practicability is high.

Description

technical field [0001] The invention belongs to the technical field of direct reduction ironmaking, and in particular relates to a gas-based reduction shaft furnace for low-strength pellets. Background technique [0002] Direct reduced iron (DRI), also known as sponge iron, is an iron-containing product obtained by direct reduction of iron ore below the melting temperature. Sponge iron is a substitute for scrap steel, an indispensable impurity diluent for electric furnace smelting of pure and high-quality steel, a high-quality coolant for converter steelmaking, and an indispensable raw material for the development of short iron and steel metallurgy processes. [0003] The direct reduction ironmaking device used in the gas-based method is the gas-based reduction shaft furnace. Most of the existing gas-based reduction shaft furnaces are thin and tall devices. During the production process, the furnace is filled with oxidized pellets, and the material column is generally tens ...

AI Technical Summary

Problems solved by technology

The compressive strength of ordinary iron concentrate oxidized pellets can easily meet this requirement, but it is difficult to meet the requirements for oxidized pellets produced from some iron ores such as laterite nickel ore and high phosphorus ore.

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