Gas double-base reduction furnace and method for producing reduced iron using gas double-base reduction furnace

Abstract

The gas double-base reduction furnace of the present invention includes: a reduction shaft furnace, an annular combustion chamber, a supercharger and a regenerator, the regenerator is set on the outside of the reduction shaft furnace, and the regenerator is fixed in the middle of the reduction shaft furnace along the height of the reduction shaft furnace , the regenerator heats the reduction shaft furnace, the annular combustion chamber is set on the outside of the regenerator, the inlet end of the annular combustion chamber is connected to the supercharger through a pipe, and the outlet end of the annular combustion chamber is connected to the lower part of the regenerator through a pipe in the circumferential direction The inlet is connected, and the upper end of the reduction shaft furnace is equipped with a feed inlet and a gas discharge pipe. There are two discharge ports on the lower ring circumference of the reduction shaft furnace, and several gas inlets are opened on the circumference of the reduction shaft furnace at the upper part of the regenerator. The gas inlet is evenly distributed on the circumference of the reduction shaft furnace at the same height, and the gas inlet is perpendicular to the center line of the reduction shaft furnace; several coal injection pipes are connected to the circumference of the reduction shaft furnace above the gas inlet, and the coal injection pipes are evenly distributed on the same height. On the circumference of the high reduction shaft furnace, the angle between the coal injection pipe and the center line of the reduction shaft furnace is 30° to 70°.

Description

technical field [0001] The invention relates to a reduction furnace for smelting iron and a method for producing reduced iron, in particular to a gas double-base reduction furnace and a method for producing reduced iron with the gas double-base reduction furnace. Background technique [0002] In order to get rid of the fetters of the development of metallurgical industry due to the shortage of coking coal resources, meet the requirements of environmental protection, and further reduce the energy consumption of the ironmaking process, the ironmaking technology with direct reduction as one of the main development directions has increasingly become the development and concern of the iron and steel industry. hot spot. [0003] As a new ironmaking technology, direct reduction technology includes two types: gas-based direct reduction and coal-based direct reduction. Among them, the direct reduction of gas-based radicals starts with H 2 The reducing gas composed of CO and CO is t...

AI Technical Summary

Problems solved by technology

In the process of cooling the raw materials, special equipment is used to recover the waste heat of the raw materials. Although the energy recovery and reuse have been achieved, the equipment has been enlarged and complicated at the same time. In addition, the comprehensive utilization rate of gas needs to be improved.

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