CN115261541A - Molten iron manufacturing apparatus and molten iron manufacturing method - Google Patents

Molten iron manufacturing apparatus and molten iron manufacturing method Download PDF

Info

Publication number
CN115261541A
CN115261541A CN202210758406.0A CN202210758406A CN115261541A CN 115261541 A CN115261541 A CN 115261541A CN 202210758406 A CN202210758406 A CN 202210758406A CN 115261541 A CN115261541 A CN 115261541A
Authority
CN
China
Prior art keywords
furnace
exhaust gas
molten iron
preheating
reaction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210758406.0A
Other languages
Chinese (zh)
Inventor
金完浩
赵敏永
孙相汉
张东硕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Posco Co Ltd filed Critical Posco Co Ltd
Publication of CN115261541A publication Critical patent/CN115261541A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0073—Selection or treatment of the reducing gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/008—Use of special additives or fluxing agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/12—Making spongy iron or liquid steel, by direct processes in electric furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/005—Preliminary treatment of scrap
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
    • F27D13/002—Preheating scrap
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/80—Interaction of exhaust gases produced during the manufacture of iron or steel with other processes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2200/00—Recycling of non-gaseous waste material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/146—Perfluorocarbons [PFC]; Hydrofluorocarbons [HFC]; Sulfur hexafluoride [SF6]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)
  • Manufacture Of Iron (AREA)
  • Treating Waste Gases (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The present invention relates to a molten iron manufacturing apparatus and a molten iron manufacturing method, the molten iron manufacturing method including: a step of melting iron ore in a reaction furnace to produce molten iron; charging a preheating furnace with waste; supplying an exhaust gas generated in the step of manufacturing the molten iron to the preheating furnace; and a step of supplying oxygen-containing gas to the preheating furnace to perform secondary combustion of the exhaust gas to preheat the scrap, thereby effectively utilizing the exhaust gas generated during the operation.

Description

Molten iron manufacturing apparatus and molten iron manufacturing method
The present application is a divisional application of a chinese patent application having an application number of 201711284660.7, entitled "molten iron manufacturing apparatus and molten iron manufacturing method", filed on 7.12.2017 by POSCO, ltd.
Technical Field
The present invention relates to an apparatus and a method for manufacturing molten iron, and more particularly, to an apparatus and a method for manufacturing molten iron, which can effectively use exhaust gas generated during operation.
Background
Reduction of carbon dioxide (CO) in various industrial fields2) Is becoming an urgent problem in the country. Accordingly, in the steel industry, which is one of high energy consumption industries, the necessity of developing a carbon dioxide reduction technology in an iron making process, which occupies 80% or more of the entire carbon dioxide generation amount, is becoming prominent.
In contrast, in order to reduce the amount of carbon dioxide generated by the use of coal resources in the process of producing molten iron (liquid iron), techniques are used such as reducing the amount of coal resources used as a reducing agent and a heat source, recovering the heat energy generated in the process, improving the reaction/process efficiency, and reducing the absolute amount of oxygen to be reduced.
At present, in order to significantly reduce carbon dioxide generated in the iron-making process, a technology of using a hydrogen-containing resource instead of a coal resource has been actively developed. However, hydrogen-containing resources are very expensive and a large amount of expense is spent in producing the hydrogen-containing resources. Further, when a hydrogen-containing by-product gas such as coke oven gas is used, the cost of the additional alternative energy is higher than that of coal resources, and therefore, the use thereof is limited.
On the other hand, in the case of a blast furnace process, which is a typical method for manufacturing molten iron, the energy efficiency is very high from the viewpoint of improving the reaction/process efficiency generated in the process, and almost reaches a level of about 95% compared with a normal theoretical value. Especially in case of korea and japan, the introduction level of advanced technology of iron making process is high, and thus the potential amount of additional energy reduction is the lowest level in the world, in a state where the reduction of energy and the amount of carbon dioxide based thereon by additional efficiency improvement has also reached the technical limit.
Further, from the viewpoint of energy recovery, a technology of recovering sensible heat from high-temperature slag, which is a representative sensible heat recovery target, is currently being tried in large quantities, but it is also true that there is no equipment commercialized at all due to problems of equipment, slag products, and the like.
Accordingly, as a technique for reducing the amount of carbon dioxide generated by reducing the absolute amount of oxygen to be reduced, there is a method of using reduced iron or scrap having a high metallic iron content as an iron source. Since the reduction rate of reduced iron or scrap is very high, when these are used as raw materials in an iron-making process, the amount of oxygen to be removed is small, and therefore the amount of coal resources used as a reducing agent can be reduced. In particular, the use of waste materials is advantageous in that waste resources can be reused. However, since the gas utilization rate is reduced in a blast furnace, a melting furnace, or the like, there is a problem that an amount of additional energy, for example, coal resources, to be put into the furnace is increased, and the use efficiency of energy that can be effectively used, such as carbon monoxide in exhaust gas, may be lowered.
Documents of the prior art
Patent document 1: KR2004-0056270A
Patent document 2: JP1996-21691A
Disclosure of Invention
The invention provides a molten iron manufacturing apparatus and a molten iron manufacturing method capable of effectively utilizing effective energy contained in waste gas.
The invention provides a molten iron manufacturing apparatus and a molten iron manufacturing method capable of reducing the usage amount of coal resources.
The molten iron manufacturing apparatus according to the embodiment of the present invention may include: a reaction furnace in which a space is formed in which a raw material including iron ore can be melted; a preheating furnace which is provided so as to communicate with the reaction furnace and has a space in which waste materials can be preheated by exhaust gas generated in the reaction furnace; a carbon dioxide remover for removing carbon dioxide from the exhaust gas generated in the preheating furnace, the carbon dioxide remover being connected to the preheating furnace and the reaction furnace to supply the exhaust gas from which carbon dioxide is removed to the preheating furnace and the reaction furnace; and a combustion device capable of blowing pure oxygen into the preheating furnace to react with the carbon dioxide-removed exhaust gas to generate reaction heat; and a hot working device provided between the reaction furnace and the preheating furnace, and adapted to thermally agglomerate the preheated scrap and feed the agglomerated scrap into the reaction furnace.
The above reaction furnace may comprise a blowing nozzle capable of supplying pure oxygen and pulverized coal.
The method for manufacturing molten iron according to the embodiment of the present invention may include: a step of melting iron ore in a reaction furnace to produce molten iron; charging a preheating furnace with scrap; supplying an exhaust gas containing hydrogen and carbon monoxide generated in the step of manufacturing the molten iron to the preheating furnace, and primarily preheating the scrap by heat of the exhaust gas; supplying pure oxygen to the preheating furnace to perform secondary combustion on the exhaust gas to generate reaction heat, and performing secondary preheating on the primary preheated waste material by using the reaction heat; removing carbon dioxide from the exhaust gas generated in the preheating furnace, supplying the exhaust gas from which carbon dioxide has been removed to the reaction furnace as a reducing gas, and supplying the exhaust gas to the preheating furnace as a fuel gas; a step of agglomerating the preheated scrap in a hot state; and a step of charging the agglomerated waste into the reaction furnace.
The step of manufacturing the molten iron may include a step of blowing pure oxygen into the reaction furnace so that a ratio of the hydrogen and the carbon monoxide is higher than a ratio of nitrogen in the off-gas.
According to the embodiment of the present invention, the specific gravity of carbon dioxide in the exhaust gas can be reduced by using the scrap containing less oxygen than iron ore as a raw material when manufacturing molten iron. In addition, energy costs required for manufacturing molten iron can be reduced by preheating scrap using exhaust gas. In particular, the preheating efficiency of the scrap can be further improved by utilizing the post-combustion of carbon monoxide and hydrogen contained in the exhaust gas.
Drawings
Fig. 1 is a diagram schematically showing the configuration of a molten iron manufacturing apparatus according to an embodiment of the present invention.
Description of the reference numerals
100: a reaction furnace; 110: blowing into a nozzle; 200: preheating a furnace; 300: a combustion device; 400: a carbon dioxide remover; 500: and (4) a hot processing device.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments disclosed below, but can be implemented in various ways different from each other, and the following description is provided only for complete disclosure of the present invention and to fully convey the scope of the invention to those having ordinary knowledge. In the drawings, the sizes of respective elements are exaggerated or enlarged for clarity, and the same reference numerals refer to the same elements in the drawings.
Fig. 1 is a diagram schematically showing the configuration of a molten iron manufacturing apparatus according to an embodiment of the present invention. In fig. 1, the solid line indicates the movement path of the raw material, and the broken line indicates the movement path of the gas.
Referring to fig. 1, the molten iron manufacturing apparatus may include: a reaction furnace 100 for melting a raw material containing iron; a preheating furnace 200 for preheating a part of the iron-containing raw material using the exhaust gas generated in the reaction furnace 100; and a combustion device 300 for generating a heat source by supplying an oxygen-containing gas to perform secondary combustion of the exhaust gas supplied to the preheating furnace 200. In addition, it may further include: a hot working device 500 for hot working the iron-containing raw material preheated in the preheating furnace 200; and a carbon dioxide remover 400 for removing carbon dioxide from the exhaust gas generated in the preheating furnace 200.
A space capable of receiving raw materials for manufacturing molten iron is formed inside the reaction furnace 100. The lower portion of the reaction furnace 100 may be provided with a blowing nozzle 110 capable of supplying a fuel and an oxygen-containing gas to melt the raw material. In this case, the raw material may include iron-containing raw materials such as iron ore, reduced iron, and sintered ore, and reducing agents such as coke and coal, and may include auxiliary raw materials such as limestone as necessary. Also, the fuel may include pulverized coal that can be fed into the reaction furnace 100 through the blowing nozzle 110, and the oxygen-containing gas may include air, pure oxygen, and the like. The injection nozzle 110 may be configured to supply the fuel and the oxygen-containing gas independently of each other, or may be configured to supply the fuel and the oxygen-containing gas together.
The reaction furnace 100 may be any of various reaction furnaces capable of producing molten iron, and for example, a blast furnace, a smelting reduction furnace, an electric furnace, or the like may be used. Here, when the reaction furnace 100 is a smelting reduction furnace, a flow reduction furnace for producing reduced iron as an iron-containing raw material charged into the reaction furnace 100 may be further included.
The preheating furnace 200 may form a space inside to receive iron-containing raw material, such as scrap. The preheating furnace 200 may be coupled to the reaction furnace 100 by a pipe or a duct to preheat the scrap using the exhaust gas generated in the reaction furnace 100. The preheating furnace 200 may further include a combustion device 300 for supplying an oxygen-containing gas to the preheating furnace 200 to generate a heat source for preheating the scrap.
The combustion apparatus 300 may supply an oxygen-containing gas such as pure oxygen to the preheating furnace 200 so that the oxygen-containing gas reacts with the exhaust gas supplied from the reaction furnace 100 to generate reaction heat. Here, the description has been given of the case where the combustion apparatus 300 is connected to the preheating furnace 200, but the combustion apparatus 300 may be connected to a pipe or a duct connecting the reaction furnace 100 and the preheating furnace 200. Further, the combustion apparatus 300 generates a heat source not by directly burning, but by supplying an oxygen-containing gas to the preheating furnace 200 so that a heat source is generated in the preheating furnace 200.
The exhaust gas generated in the reaction furnace 100 may be injected into the preheating furnace 200 to make the exhaust gas contain hydrogen (H)2) And carbon monoxide (CO) reacts with the oxygen-containing gas supplied from the combustion apparatus 300, i.e., performs secondary combustion to generate a heat source capable of preheating the scrap. In this regard, it will be explained again below.
The scrap preheated in the preheating furnace 200 may be fed into the reaction furnace 100, or may be fed into the reaction furnace 100 after being processed into a predetermined shape by the hot working apparatus 500, if necessary.
The hot working apparatus 500 is provided between the preheating furnace 200 and the reaction furnace 100, and can process the scrap by a method such as blocking or crushing. In this case, the scrap is heated in a state preheated by the preheating furnace 200, and thus can be easily molded by the hot working apparatus 500.
The carbon dioxide remover 400 can remove or separate carbon dioxide from the exhaust gas discharged from the preheating furnace 200. The carbon dioxide remover 400 may employ a PSA (Pressure Swing Adsorption) system, a TSA (Thermal Swing Adsorption) system, a chemical Adsorption system, or the like, in which carbon dioxide in the exhaust gas is selectively absorbed by a solid absorbent to be separated. The exhaust gas after passing through the carbon dioxide remover 400 includes carbon monoxide, hydrogen, and methane (CH)4) And the like, the exhaust gas may be supplied to at least any one of the reaction furnace 100 and the preheating furnace 200 or used as a raw material of a reducing agent or a chemical substance in another process. For example, the exhaust gas passing through the carbon dioxide remover 400 may be supplied to a melter-gasifier and a flow reduction furnace of a smelting reduction iron making process to be used as a reducing agent, or may be used as a raw material in the production of methanol or dimethyl ether (DME).
Hereinafter, a method for manufacturing molten iron according to an embodiment of the present invention will be described.
First, raw materials for manufacturing molten iron are charged into the reaction furnace 100. In this case, the raw material may include an iron-containing raw material such as iron ore, reduced iron, and sintered ore, and a reducing agent such as coke and coal, and may include a secondary raw material such as limestone, if necessary. In addition, when the raw material is initially charged into the reactor 100, a waste material that is not preheated may be additionally charged.
When the raw material is charged into the reactor 100, a fuel such as oxygen-containing gas and pulverized coal may be injected into the reactor 100 through the injection nozzle 110 at the lower portion of the reactor 100. At this time, the oxygen-containing gas may be blown in a state heated to a temperature of several hundred degrees, and the raw material charged into the reaction furnace 100 may be melted by heat generated by combustion of the oxygen-containing gas with the pulverized coal.
In the reaction furnace 100, molten iron is produced as the raw material is melted, and the exhaust gas generated as the molten iron is produced may be supplied to the preheating furnace 200. At this time, pure oxygen may be blown into the reaction furnace 100 in order to decrease the ratio of carbon dioxide in the exhaust gas and increase the ratio of carbon monoxide and hydrogen. When pure oxygen is blown into the reactor 100 in this manner, the nitrogen content in the exhaust gas is reduced, so that the separation of carbon dioxide to be performed later can be easily performed, and the ratio of the effective energy, for example, carbon monoxide to hydrogen in the exhaust gas can be increased. In the present invention, in order to heat the scrap that is the raw material of the molten iron, the exhaust gas generated in the reaction furnace 100 may be used. At this time, since the temperature of the exhaust gas is limited, an additional heat source is required in order to effectively preheat the scrap, i.e., to a high temperature. In contrast, in the present invention, it is possible to reduce the ratio of carbon dioxide in the components of the exhaust gas generated from the reaction furnace 100 and to increase the ratio of carbon monoxide and hydrogen in the components of the exhaust gas, which can be used as fuel required for preheating the scrap. In general, hot air obtained by heating air with an oxygen-containing gas is blown into a reaction furnace, but since the nitrogen content in the hot air is very high, most of the nitrogen in the exhaust gas is contained together with carbon dioxide. Therefore, when pure oxygen is blown into the reactor 100, the content of nitrogen in the exhaust gas can be reduced. Further, since the scrap charged for manufacturing molten iron has a small absolute amount of oxygen, that is, is in a state of being almost reduced, the amount of reducing agent charged for reducing the scrap can be reduced, but the utilization rate of the reducing agent is reduced, and the ratio of effective energy such as carbon monoxide in an intermediate form in the exhaust gas is increased.
The exhaust gas generated in the reaction furnace 100 in accordance with the manufacture of molten iron in this manner can be supplied to the preheating furnace 200 to preheat scrap. At this time, the preheating furnace 200 may be charged with scrap as the iron-containing raw material, and the charging of the scrap may be performed in the step of manufacturing molten iron in the reaction furnace 100 or before the step of manufacturing molten iron in the reaction furnace 100.
If the exhaust gas is supplied to the preheating furnace 200, an oxygen-containing gas such as pure oxygen may be blown into the preheating furnace 200 through the combustion device 300. The oxygen-containing gas supplied to preheating furnace 200 can generate a heat source by the reactions of chemical formulas 1 and 2 below and the reaction of hydrogen and carbon monoxide in the exhaust gas.
[ chemical formula 1 ]
Figure BDA0003723380040000061
[ chemical formula 2 ]
Figure BDA0003723380040000062
That is, the scrap charged into the preheating furnace 200 may be primarily preheated by the exhaust gas supplied from the reaction furnace 100, and may be secondarily preheated by using reaction heat generated by the reaction of hydrogen and carbon monoxide in the exhaust gas and the oxygen-containing gas blown into the preheating furnace 200.
The scrap may be preheated in the preheating furnace 200 and then charged into the reaction furnace 100 to manufacture molten iron. Alternatively, the scrap may be preheated in the preheating furnace 200, then molded or processed into a predetermined shape in the hot working apparatus 500, and then introduced into the reaction furnace 100.
When the scrap is preheated and then charged into the reaction furnace 100, the amount of heat is increased as compared with the case where the scrap is charged in a cold state, so that the reduction in the temperature in the furnace or the reduction in the temperature of the molten iron can be suppressed, and the amount of energy used for manufacturing the molten iron can be reduced.
On the other hand, the exhaust gas generated in the preheating furnace 200 can be passed through the carbon dioxide remover 400 to remove or separate carbon dioxide contained in the exhaust gas. That is, carbon dioxide is included in the exhaust gas generated in the reaction furnace 100, and carbon dioxide is further generated while the scrap is preheated in the preheating furnace 200.
Accordingly, passing the exhaust gas generated in the preheating furnace 200 through the carbon dioxide remover 400 can remove or separate carbon dioxide from the exhaust gas. The exhaust gas from which carbon dioxide is separated in the carbon dioxide remover 400 may contain hydrogen, carbon monoxide, methane, and the like as by-products. The by-product gas may be supplied to the reaction furnace 100 to be used as a reducing gas for reducing the raw material. Alternatively, it may be supplied to the preheating furnace 200 to be used as fuel gas for heating the scrap. Alternatively, the gas may be supplied to a melter gasifier, a fluidized reduction furnace, or the like in the smelting reduction iron making process to be used as a reducing gas, or may be used as a raw material in the production of methanol or dimethyl ether (DME).
The technical idea of the present invention is specifically described according to the above embodiments, but it should be understood that the above embodiments are only for illustration and are not intended to limit the same. In addition, it should be understood that those skilled in the art of the present invention can implement various embodiments within the scope of the technical idea of the present invention.

Claims (4)

1. An apparatus for manufacturing molten iron, comprising:
a reaction furnace in which a space is formed in which a raw material including iron ore can be melted;
a preheating furnace which is provided in a manner to communicate with the reaction furnace, and which forms a space in which waste can be preheated by exhaust gas generated in the reaction furnace;
a carbon dioxide remover removing carbon dioxide from the exhaust gas generated in the preheating furnace, the carbon dioxide remover being connected to the preheating furnace and the reaction furnace to supply the exhaust gas from which carbon dioxide is removed to the preheating furnace and the reaction furnace; and
a combustion device configured to blow pure oxygen into the preheating furnace and generate reaction heat by reacting the pure oxygen with the carbon dioxide-removed exhaust gas; and
and a hot working device provided between the reaction furnace and the preheating furnace, the hot working device being capable of thermally agglomerating the preheated scrap and charging the agglomerated scrap into the reaction furnace.
2. The molten iron manufacturing apparatus according to claim 1,
the reaction furnace comprises a blowing nozzle capable of supplying pure oxygen and pulverized coal.
3. A method of manufacturing molten iron, comprising:
a step of melting iron ore in a reaction furnace to produce molten iron;
charging a preheating furnace with waste;
supplying an exhaust gas containing hydrogen and carbon monoxide generated in the step of manufacturing the molten iron to the preheating furnace, and primarily preheating the scrap using heat of the exhaust gas;
supplying pure oxygen to the preheating furnace to perform secondary combustion on the exhaust gas to generate reaction heat, and performing secondary preheating on the primary preheated waste material by using the reaction heat;
removing carbon dioxide from the exhaust gas generated in the preheating furnace, supplying the exhaust gas from which carbon dioxide has been removed to the reaction furnace as a reducing gas, and supplying the exhaust gas to the preheating furnace as a fuel gas;
a step of agglomerating the preheated scrap in a hot state; and
a step of charging the agglomerated waste into the reaction furnace.
4. The molten iron manufacturing method according to claim 3,
the step of manufacturing the molten iron includes a step of blowing pure oxygen into the reaction furnace so that the ratio of the hydrogen and the carbon monoxide is higher than the ratio of the nitrogen in the off-gas.
CN202210758406.0A 2016-12-22 2017-12-07 Molten iron manufacturing apparatus and molten iron manufacturing method Pending CN115261541A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-2016-0176743 2016-12-22
KR1020160176743A KR101998733B1 (en) 2016-12-22 2016-12-22 Apparatus for manufacturing molten iron and method for manufacturing thereof
CN201711284660.7A CN108220519A (en) 2016-12-22 2017-12-07 Molten iron manufacturing device and process for producing molten iron

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CN201711284660.7A Division CN108220519A (en) 2016-12-22 2017-12-07 Molten iron manufacturing device and process for producing molten iron

Publications (1)

Publication Number Publication Date
CN115261541A true CN115261541A (en) 2022-11-01

Family

ID=62653292

Family Applications (2)

Application Number Title Priority Date Filing Date
CN202210758406.0A Pending CN115261541A (en) 2016-12-22 2017-12-07 Molten iron manufacturing apparatus and molten iron manufacturing method
CN201711284660.7A Pending CN108220519A (en) 2016-12-22 2017-12-07 Molten iron manufacturing device and process for producing molten iron

Family Applications After (1)

Application Number Title Priority Date Filing Date
CN201711284660.7A Pending CN108220519A (en) 2016-12-22 2017-12-07 Molten iron manufacturing device and process for producing molten iron

Country Status (3)

Country Link
JP (1) JP6548707B2 (en)
KR (1) KR101998733B1 (en)
CN (2) CN115261541A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102115888B1 (en) * 2018-11-16 2020-06-05 주식회사 포스코 Manufacturing method for molten iron and apparatus thereof
KR102115887B1 (en) * 2018-11-16 2020-06-05 주식회사 포스코 Manufacturing method for molten iron and apparatus thereof
JP7463174B2 (en) 2020-04-06 2024-04-08 三菱重工業株式会社 SOLID CARBON GENERATION APPARATUS AND SOLID CARBON GENERATION METHOD

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06212288A (en) * 1993-01-19 1994-08-02 Nippon Steel Corp Method for preheating iron scrap and method for refining preheated iron scrap
CN101906501A (en) * 2010-08-03 2010-12-08 莱芜钢铁集团有限公司 Direct steelmaking process by using fine ores, coal and oxygen
CN104870659A (en) * 2012-12-27 2015-08-26 株式会社Posco Molten iron manufacturing apparatus and molten iron manufacturing method

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5121931B1 (en) * 1964-02-27 1976-07-06
JPH02159311A (en) * 1988-12-09 1990-06-19 Godo Seitetsu Kk Mixer and iron bath type smelting reduction iron making method combined with melting of scrap and equipment thereof
JP2790367B2 (en) * 1990-09-27 1998-08-27 新日本製鐵株式会社 Iron-containing cold material melting method
US5466278A (en) * 1990-12-11 1995-11-14 Metallgesellschaft Aktiengesellschaft Process for the manufacture of steel
JPH0535842U (en) * 1991-10-07 1993-05-14 新日本製鐵株式会社 Converter type metallurgical reactor
JPH0821691A (en) 1994-07-07 1996-01-23 Nkk Corp Preheating and melting method for iron scrap of electric furnace
JPH10219327A (en) * 1997-01-31 1998-08-18 Nippon Steel Corp Smelting reduction method of iron raw material and smelting reduction furnace
JP2001311589A (en) * 2000-04-28 2001-11-09 Nippon Steel Corp Method for reducing or removing hazardous substance in exhaust gas
KR100931227B1 (en) 2002-12-23 2009-12-10 주식회사 포스코 Combined steelmaking equipment and method
KR100930680B1 (en) * 2007-12-26 2009-12-09 주식회사 포스코 Molten iron manufacturing equipment and molten iron manufacturing method
CN101575653A (en) * 2009-06-17 2009-11-11 北京大学 Method and device for separating carbon dioxide to improve mass energy of blast furnace gas
JP2012007213A (en) * 2010-06-25 2012-01-12 Mitsubishi Heavy Ind Ltd Method for direct reduction ironmaking, and apparatus for production of reducing gas therefor
KR101451405B1 (en) * 2012-11-30 2014-10-15 주식회사 포스코 Apparatus for hardening microgranulates and apparatus for manufacturing molten iron comprising the same
KR101558440B1 (en) * 2014-04-29 2015-10-12 한국에너지기술연구원 Electric arc furnace with simultaneous scrap preheating apparatus and it's operation method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06212288A (en) * 1993-01-19 1994-08-02 Nippon Steel Corp Method for preheating iron scrap and method for refining preheated iron scrap
CN101906501A (en) * 2010-08-03 2010-12-08 莱芜钢铁集团有限公司 Direct steelmaking process by using fine ores, coal and oxygen
CN104870659A (en) * 2012-12-27 2015-08-26 株式会社Posco Molten iron manufacturing apparatus and molten iron manufacturing method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张建良等: "实用物流技术", 中国物资出版社出版, pages: 197 - 198 *

Also Published As

Publication number Publication date
JP6548707B2 (en) 2019-07-24
KR101998733B1 (en) 2019-07-10
JP2018104812A (en) 2018-07-05
KR20180073177A (en) 2018-07-02
CN108220519A (en) 2018-06-29

Similar Documents

Publication Publication Date Title
EP3649264B1 (en) Method for operating an iron- or steelmaking- plant
CN113924372A (en) Method and system for producing steel or molten iron-containing material with reduced emissions
KR20150053809A (en) Method for heating process gases for direct reduction systems
WO2009037587A2 (en) Method and apparatus for the direct reduction of iron ores utilizing gas from a melter-gasifier
CN115516116A (en) Method for producing carburized sponge iron
CN115261541A (en) Molten iron manufacturing apparatus and molten iron manufacturing method
WO2021220555A1 (en) Iron manufaturing facility and method for manufacturing reduced iron
KR101376138B1 (en) Apparatus for manufacturing molten iron and method for manufacturing thereof
KR101758521B1 (en) Apparatus and Method of Recycling and Decomposition of Carbon Dioxide via Accumulated Energy of Hot Stove
Pang et al. The Low‐Carbon Production of Iron and Steel Industry Transition Process in China
KR20180001860A (en) Apparatus for manufacturing molten irons and method for manufacturing molten irons using the same
KR101321928B1 (en) Apparatus for manufacturing molten irons and method for manufacturing molten irons using the same
WO2013064870A1 (en) Process for producing direct reduced iron (dri) with less co2 emissions to the atmosphere
CN115652007A (en) Novel smelting reduction iron-making method and device
JP2016536468A (en) Steel production in coke dry fire extinguishing system.
CN114729407A (en) Carbon monoxide production method and application thereof
KR102083540B1 (en) Apparatus for manufacturing molten iron and method for manufacturing thereof
US20240026476A1 (en) Method and apparatus for metals, alloys, mattes, or enriched and cleaned slags production from predominantly oxide feeds
JP7272312B2 (en) Method for producing reduced iron
EP3868899B1 (en) Carbon dioxide emission reduction type molten iron manufacturing apparatus and manufacturing method thereof
JP7148721B2 (en) Carbon dioxide emission reduction type molten iron manufacturing apparatus and manufacturing method thereof
KR20240018212A (en) Facility for manufacturing molten iron and method for manufacturing molten iron
KR20230138002A (en) Off-gas recovery from direct reduction process
CN118139994A (en) Method for reducing the carbon footprint in the operation of a pig iron-producing metallurgical plant
CN116888281A (en) Intelligent hydrogen production for DRI manufacture

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information

Address after: Seoul City, Korea

Applicant after: POSCO Holdings Co.,Ltd.

Address before: Gyeongbuk, South Korea

Applicant before: POSCO

CB02 Change of applicant information
TA01 Transfer of patent application right

Effective date of registration: 20230608

Address after: Gyeongbuk, South Korea

Applicant after: POSCO Co.,Ltd.

Address before: Seoul City, Korea

Applicant before: POSCO Holdings Co.,Ltd.

TA01 Transfer of patent application right