Gas-based reduction shaft furnace

Abstract

The invention belongs to the technical field of gas-based direct reduction iron-making, and particularly discloses a gas-based reduction shaft furnace. A shaft furnace body comprises a preheating section, a reduction section and a cooling section, wherein the reduction section is in a big-end-down circular truncated cone shape; the bottom of the reduction section is connected with the cooling section; the upper portion of the reduction section is connected with the preheating section; and an air guide wall is arranged in the reduction section and coincides with the axis of the reduction section. By changing the angle between the reduction section furnace body and the horizontal plane, the furnace profile adapts to volume expansion during pellet reduction, extrusion force between pellets and a furnace wall as well as between the pellets can be reduced, and the situation that liquid generated by the pellets with high temperature is consecutive and bonded into blocks is effectively restrained; the air permeability in the shaft furnace is enhanced, so that the shaft furnace runs smoothly; and the air guide wall is arranged in the reduction section, so that reduction air flow can be uniformly distributed in the shaft furnace.

Description

technical field [0001] The invention belongs to the technical field of gas-based direct reduction ironmaking, in particular to a gas-based reduction shaft furnace. Background technique [0002] The gas-based direct reduction process is the main production method of direct reduced iron, and the gas-based direct reduction process mainly includes a shaft furnace process, a fluidized bed process and a reaction tank process. In 2019, the global direct reduced iron production was 108 million tons, of which 82 million tons were produced by the gas-based direct reduction process, and 85% of the 82 million tons of gas-based reduced iron were produced by shaft furnaces. Dominant in reducing iron smelting. In the direct reduction process of the existing gas-based shaft furnace, when the concentration of carbon monoxide is too high, the expansion of the pellets will be intensified, which will further increase the mutual extrusion between the furnace materials and cause the bonding of t...

AI Technical Summary

Problems solved by technology

This patent breaks the bonded pellets after the pellets are bonded in the shaft furnace, which cannot suppress the pellets from the source, and also increases the process.

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