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Apparatus for manufacturing molten pig iron and reduced iron by utilizing fluidized bed, and method therefor

A preparation device, fluidized bed technology, applied in the direction of process efficiency improvement, sustainable manufacturing/processing, climate sustainability, etc., can solve the problems of high equipment cost, complicated equipment, complicated operation, etc.

Inactive Publication Date: 2000-03-22
POHANG IRON & STEEL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the equipment is very complex and correspondingly high original equipment cost and complex to operate

Method used

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  • Apparatus for manufacturing molten pig iron and reduced iron by utilizing fluidized bed, and method therefor
  • Apparatus for manufacturing molten pig iron and reduced iron by utilizing fluidized bed, and method therefor
  • Apparatus for manufacturing molten pig iron and reduced iron by utilizing fluidized bed, and method therefor

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Embodiment Construction

[0025] image 3 It is a schematic diagram of the molten iron preparation device of the present invention. Such as image 3 As shown, the molten iron preparation device 100 of the present invention includes: a melting and gasifying furnace 11 for gasifying coal and melting reduced iron ore; a third fluidized bed calciner 12 for utilizing the melting and gasifying furnace 11 to discharge The gas calcined limestone; the second fluidized bed reduction furnace 13, used for indirect reduction of fine iron ore; the first fluidized bed reduction furnace 14, used for preheating and pre-reducing fine iron ore; dust cyclone separator 111 , for sending the dust (separated from the reducing gas of the melter-gasifier 11) into the dust recirculation device 112, and supplying the waste gas (separated from the dust) to the third fluidized bed calciner 12; The melting burner 113 installed on the melting and gasifying furnace 11 is used to inject fine iron ore from the dust recirculation devi...

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Abstract

An apparatus and a method for manufacturing molten pig iron by using a fine iron ore are disclosed. Coal is used to produce a reducing gas, and a fine iron ore is used to produce a molten iron and a reduced iron in a simple and efficient manner. The apparatus for manufacturing a molten iron by directly using coal as the fuel according to the present invention is characterized as follows. A high temperature reducing gas is sent from a melter-gasifier for a fluidized bed lime stone calcining furnace to calcine lime stone. Then the reducing gas is supplied to a second fluidized bed reducing furnace so as to manufacture a reduced iron directly. An off-gas from the second fluidized bed reducing furnace is supplied to a first fluidized bed reducing furnace disposed above the second fluidized bed reducing furnace to pre-heat and pre-reduce the fine iron ore. The calcined lime stone and the finally reduced iron are supplied to a melter-gasifier to manufacture a molten pig iron.

Description

field of invention [0001] The invention relates to a device for preparing molten pig iron and direct reduced iron from fine iron ore, and a method for preparing molten pig iron using the device. Background of the invention [0002] US Patent No. 4,978,387 discloses a typical method for producing molten pig iron using raw iron ore and coal without pretreatment. [0003] According to the US patent, raw iron ore and coal are directly used so that preprocessing steps such as sintering and coking can be skipped, thereby simplifying production steps and manufacturing facilities. [0004] Such as figure 1 As shown, the device 400 of US Pat. No. 4,978,387 includes: a melting gasifier 410 for gasifying coal and melting reduced iron; a packed bed type pre-reduction furnace 432 for indirect reduction using the reducing gas generated by the melting iron ore; and other auxiliary equipment. [0005] The auxiliary equipment includes: cyclone separator 411 ; recirculation device 412 ; me...

Claims

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Application Information

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IPC IPC(8): C21B13/00C21B13/14
CPCC21B13/002C21B13/14C21B2100/44C21B2100/64Y02P10/20
Inventor 周相勋李相德申明均李晙赫赵敏永金倖久姜兴远
Owner POHANG IRON & STEEL CO LTD
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