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Method for producing direct iron-reduction by iron-ore briquet self-production reproduced gas

A technology of coal pellets and reduced iron, which is applied in the field of direct reduction smelting of iron ore coal pellets, can solve the problems of unreasonable use and waste of energy, and achieve the effects of reducing greenhouse gas emissions, reducing investment, and reducing energy consumption

Inactive Publication Date: 2010-04-21
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

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Embodiment Construction

[0033] Material operation mode: The 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℃) generate direct reduced iron, direct reduced iron is cooled to below 300℃ through cooling section, The gas seal is discharged from the shaft furnace by the discharger.

[0034] Operation mode of reducing gas: prepare N before starting the furnace 2 As the starting gas source, the N 2 Fill the carbonization chamber, reducing gas chamber, reducing gas regenerative furnace, furnace top gas purification device, cooling circulation system and their connected pipes in the reduction shaft furnace, and push out all the air in the equipment and pipes and clean it up .

[0035] N 2 It is heated to 900~1300℃, transported to the shaft furnace through pipelines, passes through the reduction section, coal pyrolysis an...

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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-producedreduction 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 utilizing the self-produced reducing gas of iron ore coal pellets. Background technique [0002] The production methods of DRI 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, but this method uses natural gas as reducing gas and heat source, which makes natural gas lack The use of this technology is restricted in regions. For regions with abundant coal resources, it is of practical significance to use the coal-based method to produce DRI. Coal-based methods for producing DRI mainly include rotary cellars, silo cellars, tank furnaces, rotary hearth furnaces, shaft furnaces, etc. These methods use coal gas or self-produced coal gas in the furnace as reducing gas to heat iron oxide pellets Direct reduced iron ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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