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Direct iron-reduction by iron-ore briquet self-production reproduced gas

A technology for reducing iron and coal pellets, applied to furnace types, furnaces, shaft furnaces, etc., can solve problems such as irrational use and waste of energy, and achieve the effects of reducing greenhouse gas emissions, investment, and main equipment

Inactive Publication Date: 2007-01-17
苏亚杰
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Problems solved by technology

Therefore, the reduction tail gas produced by the production of direct reduced iron contains CO 2 and H 2 O, mainly by CO, H 2 、CH 4 It is composed of reducing components, and has strong reducing performance. If it is only used as fuel, and producer gas and coke oven gas are used as reducing gases, it will cause unreasonable use of energy and great waste.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] Material operation mode: iron ore coal pellets are loaded into the shaft furnace from the top charging port of the reduction shaft furnace, enter the reduction chamber of the shaft furnace through the upper gas seal, and pass through the preheating section (900°C) to generate direct reduced iron, which cools down to below 300°C through the cooling section, and undergoes lower reduction The gas seal is discharged from the shaft furnace by the discharger.

[0034] Reducing gas operation mode: prepare N before starting the furnace 2 As the starting gas source, N 2 Fill into the carbonization chamber, reducing gas chamber, reducing gas regenerative furnace, furnace top gas purification device, cooling circulation system and connected pipelines in the reduction shaft furnace, and push out and clean all the air in the equipment and pipelines .

[0035] N from the reducing gas regenerative furnace 2 Heated to 900-1300°C, transported to the shaft furnace through pipelines, p...

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Abstract

The present invention relates to a method of producing direct reduction iron with self-produced reduction gas of iron ore-coal pellet. With the coal in the iron ore-coal pellet as the whole reducing agent, the gas generated by self-pyrolysis of the coal in the iron ore-coal pellet as the self-produced reduction gas and the low heat value gas as the fuel heating the reduction gas, the self-produced reduction gas is recycled and reduces the iron ore into direct reduction iron in reducing atmosphere at high temperature. The present invention replaces the external reduction gas with the self-produced reduction gas facilitating zero release of greenhouse gases in the production of direct reduction iron and the realization of clean production.

Description

technical field [0001] The invention relates to a direct reduction smelting method for iron ore coal pellets, in particular to a method for producing direct reduced iron by using the iron ore coal pellets to produce reducing gas. Background technique [0002] The production methods of direct reduced iron are mainly divided into gas-based method and coal-based method. The gas-based method has been widely used in the world and is a mature technology. However, due to the use of natural gas as the reducing gas and heat source in this method, natural gas is scarce The use of this technology is restricted in some regions. For areas rich in coal resources, the use of coal-based methods to produce direct reduced iron has practical significance. Coal-based methods to produce direct reduced iron mainly include rotary kiln, flint road kiln, tank furnace, rotary hearth furnace, shaft furnace and other methods. These methods use coal gas or self-produced gas in the furnace as reducing g...

Claims

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Application Information

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IPC IPC(8): C21B13/02
Inventor 苏亚杰杜英虎尹年方苏亚达
Owner 苏亚杰
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