WO2015133839A1 - Electric arc furnace and method for preheating scrap in electric arc furnace - Google Patents

Electric arc furnace and method for preheating scrap in electric arc furnace Download PDF

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Publication number
WO2015133839A1
WO2015133839A1 PCT/KR2015/002135 KR2015002135W WO2015133839A1 WO 2015133839 A1 WO2015133839 A1 WO 2015133839A1 KR 2015002135 W KR2015002135 W KR 2015002135W WO 2015133839 A1 WO2015133839 A1 WO 2015133839A1
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WO
WIPO (PCT)
Prior art keywords
scrap
exhaust gas
electric arc
furnace
preheating
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PCT/KR2015/002135
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French (fr)
Korean (ko)
Inventor
장병록
박재철
홍성식
안지호
조경훈
Original Assignee
주식회사 에스에이씨
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Publication of WO2015133839A1 publication Critical patent/WO2015133839A1/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/56—Manufacture of steel by other methods
    • C21C5/562—Manufacture of steel by other methods starting from scrap
    • C21C5/565—Preheating of scrap
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/527—Charging of the electric furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
    • F27B3/085—Arc furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/18—Arrangements of devices for charging
    • 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
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/527—Charging of the electric furnace
    • C21C2005/5282—Charging of the electric furnace with organic contaminated scrap
    • 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

Definitions

  • the present invention relates to an electric arc furnace (ELECTRIC ARC FURNACES), and more particularly to an electric arc furnace and a method of scrap preheating of the electric arc furnace to reuse the hot exhaust gas emitted from the furnace body for the preheating of the scrap.
  • ELECTRIC ARC FURNACES electric arc furnace
  • blast furnace steelmaking iron blast furnace
  • electric arc furnace steelmaking recycling iron scrap
  • Electric arc furnace energy consumption is 40% compared to blast furnace method, and carbon dioxide emissions are 30%.
  • the electric arc furnace method has the advantages of simpler steelmaking process, less total energy (electric + fuel) consumption and less carbon emission, as there is no coke process and sintering process compared to the blast furnace method, while melting the scrap iron raw materials by generating high temperature arc It consumes a tremendous amount of power to make it work.
  • An object of the present invention is to provide an electric arc furnace and a method of preheating scrap of an electric arc furnace which can preheat the scrap to a high temperature using flue gas unreacted heat and sensible heat.
  • An object of the present invention is to provide an electric arc furnace and a scrap preheating method of the electric arc furnace that can save energy by utilizing the oxygen-fule combustion technology and heat recovery of unreacted flue gas.
  • An object of the present invention is to provide an electric arc furnace and a method of preheating scrap of an electric arc furnace capable of removing odor generated during scrap preheating by pyrolyzing the exhaust gas used for scrap preheating back into the electric arc furnace body.
  • An object of the present invention is to provide an electric arc furnace and a method of preheating scrap of an electric arc furnace, which can prevent the exhaust gas from flowing out when the scrap is introduced.
  • the furnace body having a cylindrical container for receiving the scrap to be melted and a container cover covering the top of the container; It is provided on one side of the furnace body, the scrap to be supplied to the furnace body is stored therein, and a portion of the hot exhaust gas discharged from the exhaust port of the furnace body is introduced to preheat the scrap before being supplied to the furnace body Scrap preheating furnace; A main exhaust line connecting the exhaust port of the furnace body and an exhaust unit having a suction fan; And it is to provide an electric arc furnace including an exhaust gas recirculation unit for supplying a portion of the high-temperature exhaust gas exhausted through the main exhaust line to the scrap preheating charging path.
  • the exhaust gas recirculation unit may further include a circulation exhaust line branched from the main exhaust line and connected to the scrap preheating charging path; And a work impeller rotated by the suction pressure generated in the main exhaust line. And an idling impeller installed in the circulation exhaust line and receiving power from the work impeller to generate circulation airflow in the circulation exhaust line.
  • the exhaust gas recirculation unit may further include a clutch to control the power transmitted from the work impeller to the idling impeller.
  • the apparatus may further include temperature measuring means for measuring a temperature of the exhaust gas flowing into the main exhaust line, wherein the exhaust gas recirculating part is transferred from the work impeller to the idling impeller based on the value measured by the temperature measuring means. It may further include a clutch control unit for controlling the clutch power transmission to the control unit for controlling the power.
  • the electric arc furnace is connected to the main exhaust line between the work impeller and the exhaust port of the furnace body, and flows into the work impeller according to a change in temperature and pressure of exhaust gas discharged from the exhaust port of the furnace body. It may further include a control air supply line for supplying air to the main exhaust line so that the temperature and pressure of the exhaust gas is kept constant.
  • the exhaust gas recirculation unit may be installed in the circulating exhaust line, and may further include an auxiliary burner for burning the exhaust gas to secure chemical thermal energy.
  • the apparatus may further include a bypass line bypassing the work impeller installed in the main exhaust line.
  • the step of charging the scrap into the furnace body to melt Exhausting the exhaust gas generated during the scrap melting process in the furnace body through a main exhaust line; And preheating the scrap by recycling a portion of the exhaust gas exhausted from the main exhaust line to a scrap preheating charging furnace in which the scrap to be supplied to the furnace body is stored.
  • the scrap preheating step may provide a circulating air stream of the exhaust gas recycled to the scrap preheating charge while rotating the idling impeller received power from the work impeller rotated by the suction pressure generated in the main exhaust line.
  • the power transmitted from the work impeller to the idling impeller in the scrap preheating step may be interrupted by a clutch.
  • the scrap preheating step may secure chemical thermal energy by burning the exhaust gas when the temperature of the exhaust gas recycled to the scrap preheating charging path is low.
  • the exhausting step may further supply air to the main exhaust line so that the temperature and pressure of the exhaust gas flowing into the work impeller is kept constant when the temperature and pressure of the exhaust gas discharged from the furnace body is low.
  • the scrap preheating method of the electric arc furnace is to stop the operation of the idling impeller so as to prevent the exhaust gas flow through the scrap preheating charge when additional scrap into the furnace body to the negative pressure to the internal pressure of the scrap preheating charge path I can make it.
  • the hot exhaust gas generated during molten steel is preheated without additional power input and recycled back into the furnace, thereby having a special effect of maximizing the utilization of unutilized potential thermal energy.
  • energy can be saved by utilizing oxygen-fule combustion technology and heat recovery of unreacted flue gas.
  • the odor generated during scrap preheating can be removed by recycling the exhaust gas used for the preheating of the scrap into the electric arc furnace body and pyrolyzing it.
  • FIG. 1 is a plan view for explaining an electric arc furnace according to the present invention.
  • FIG. 2 is a side view of the electric arc furnace shown in FIG. 1.
  • FIG. 3 is a schematic view showing the exhaust gas flow of the electric arc furnace shown in FIG. 1.
  • FIG. 4 is a flowchart showing a scrap preheating process in an electric arc furnace.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • FIG. 1 and 2 are a plan view and a side view for explaining the electric arc furnace according to the present invention.
  • FIG. 3 is a schematic view showing the exhaust gas flow of the electric arc furnace shown in FIG. 1.
  • An electric arc furnace is a facility for manufacturing steel by melting and refining scrap by arc (ARC) heat generated between the electrode and the iron scrap (hereinafter referred to as scrap) by passing an electric current through the electrode, which is an electrical conductor. to be.
  • ARC scrap by arc
  • the electric arc furnace 10 includes a furnace main body 100, a scrap preheating charging path 200, a main exhaust line 300, an exhaust gas recirculation unit 400, and an exhaust unit 500. Include.
  • the furnace body 100 includes a cylindrical container 110 for accommodating scrap to be melted and a container cover 120 for closing the open top of the container 110.
  • the container cover 120 is provided in a water-cooled manner, and three electrodes 130 are vertically penetrated in the center of the container cover 120 for the melting process.
  • the electrode 130 may move up and down within the furnace body 10, and the electrode 130 may be connected to an AC power source of three phases.
  • An exhaust port 140 through which exhaust gas is discharged is provided at a position shifted from the center of the container cover 120.
  • a sealing material is attached around the container cover and around the electrode to eliminate the gap and prevent air from entering the furnace body from the outside.
  • the container 110 is provided with a scrap input port 190 for injecting scrap on one side.
  • the scrap input port 190 is connected to the scrap preheating charging path 200.
  • the container 110 may be provided with a slag outlet for discharging slag and a molten steel outlet for discharging molten steel.
  • the scrap preheating charge passage 200 is connected to the scrap input port 190.
  • the scrap preheating charging path 200 is loaded with scrap S to be supplied to the furnace body 100 therein, and a portion of the hot exhaust gas discharged from the exhaust port 140 of the furnace body 100 flows into the furnace.
  • the scrap S is preheated before being supplied to the main body 100.
  • the scrap preheating charging path 200 is formed with an inclined portion 210, one end of which is inclinedly connected to the scrap input port 190, and is formed to extend in a substantially vertical upward direction from the other end of the inclined portion 210. It includes a pre-heating portion 220 is formed an opening into which the scrap (S) is introduced.
  • the inclined portion 210 is provided with a pusher device 290 for pushing the scrap (S) to the scrap input port 190, the pusher device 290 is a pusher (operated by a drive device 292, such as a cylinder ( 294).
  • a drive device 292 such as a cylinder ( 294).
  • the opening of the pre-heating part 220 is opened and closed by the door 230. Directly below the door 230 is installed, the circulating exhaust line 410 of the exhaust gas recirculation unit 400 is connected to supply the hot exhaust gas to the preheating part 220.
  • the scrap S is introduced through the open opening and deposited on the preheating part 220. And, it is effectively preheated by the high temperature exhaust gas supplied through the circulation exhaust line 410.
  • the preheated scrap S is supplied to the furnace body through the scrap input port by the pusher of the pusher device.
  • the main exhaust line 300 connects the exhaust port 140 and the exhaust part 500 of the furnace body 100.
  • the exhaust gas generated in the furnace body 100 is provided to the exhaust unit 500 through the main exhaust line 300 connected to the exhaust port 140 by the suction force provided from the exhaust unit 500 and exhausted to the outside.
  • the exhaust part 500 may include a suction fan 510 and a dust collector 520.
  • the main exhaust line 300 is provided with a bypass line 380 bypassing the work impeller in an emergency.
  • the exhaust gas recirculation unit 400 is provided to supply a portion of the high temperature exhaust gas exhausted through the main exhaust line 300 to the scrap preheating charging path 200.
  • the exhaust gas recirculation unit 400 includes a circulating exhaust line 410, a work impeller 420, an idling impeller 430, a clutch 440, a clutch control unit 450, an auxiliary burner 460, and a control air supply line 470. ).
  • the circulating exhaust line 410 branches from the main exhaust line 300 and is connected to the scrap preheating charging path 200.
  • the work impeller 420 is installed on the main exhaust line 300 and rotated by the suction pressure generated in the main exhaust line 300.
  • the idling impeller 430 is installed on the circulation exhaust line 410.
  • the idling impeller 430 receives power from the work impeller 420 to generate circulating airflow in the circulating exhaust line 410. Power transmission from the work impeller 420 to the idling impeller 430 is provided by the clutch 440.
  • the exhaust gas recirculation unit 400 may recycle the exhaust gas without additional power by using the suction pressure of the main exhaust line 300 as the power required for the exhaust gas recirculation.
  • the clutch controller 450 controls the clutch 440 according to the temperature of the exhaust gas. That is, the clutch controller 450 may transmit power transmitted from the work impeller 420 to the idling impeller 430 based on the temperature measurement value of the exhaust gas measured by the temperature measuring means 452 installed in the main exhaust line 300. To control. For example, the clutch controller 450 blocks power transmission through the clutch 440 when the temperature of the exhaust gas is low during initial operation, and idling from the work impeller 420 when the temperature of the exhaust gas rises above a predetermined temperature. The clutch 440 is controlled to transmit power to the impeller 430.
  • the preset temperature may be a preheatable temperature (for example, 1100 ° C.) that is sufficient to preheat the scrap.
  • the auxiliary burner 460 is installed in the circulation exhaust line. More specifically, the auxiliary burner 460 is installed on the circulating exhaust line 410 connecting between the idling impeller 430 and the scrap preheating charging path 200.
  • the auxiliary burner 460 is provided to secure chemical thermal energy by burning Co, H, etc. of the exhaust gas when the scrap preheating is insufficient only by the sensible heat of the exhaust gas.
  • the control air supply line 470 is connected to the main exhaust line 300 between the work impeller 420 and the exhaust port 140 of the furnace body 100.
  • the control air supply line 470 maintains a constant temperature and pressure of the exhaust gas flowing into the work impeller 420 according to a change in the temperature and pressure of the exhaust gas emitted from the exhaust port 140 of the furnace body 100.
  • Air is additionally supplied to the main exhaust line 300.
  • the air added may be room temperature air or heated air.
  • the pressure of the main exhaust line 300 may be adjusted using a damper (not shown).
  • the electric arc furnace 10 is to add the scrap by opening the door in the state of stopping the operation of the idling impeller 430 at the time of additional scrap input through the scrap preheating charging path (200). That is, since the pressure of the furnace main body 100 becomes negative when the supply of the exhaust gas through the circulation exhaust line 410 is stopped because the operation of the impeller is stopped, the furnace main body 100 is opened even when the door of the scrap preheating charging path 200 is opened. Exhaust gas does not flow to the outside through the opening of the scrap preheating charging path (200).
  • FIG. 4 is a flowchart showing a scrap preheating process in an electric arc furnace.
  • the scrap preheating method includes charging the scrap S into the furnace body 100 and melting it (S100), and exhaust gas generated in the scrap melting process in the furnace body 100. Exhausting through the exhaust line 300 (S200) and a portion of the exhaust gas exhausted from the main exhaust line 300 to the scrap preheating charging path 200 in which the scrap (S) to be supplied to the furnace body 100 is stored. Recirculating and preheating the scrap (S300).
  • the scrap preheating step (S300) is recycled to the scrap preheating charging path (200) while the idling impeller (430) powered by the work impeller (420) rotated by the suction pressure generated in the main exhaust line (300) rotates.
  • the auxiliary burner 460 may be used to burn the exhaust gas to secure chemical thermal energy.
  • Exhaust step (S200) is a control air supply line 470 so that the temperature and pressure of the exhaust gas flowing into the work impeller 420 is kept constant when the temperature and pressure of the exhaust gas discharged from the furnace body 100 is low Air may be further supplied to the main exhaust line 300 through.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The present invention provides an electric arc furnace. The electric arc furnace of the present invention comprises: a furnace body having a cylindrical container for accommodating scraps to be melted and a container cover for covering the upper portion of the container; a scrap preheating and charging furnace which stores therein the scraps to be supplied to the furnace body and preheats the scraps using a part of a hot exhaust gas discharged from an exhaust port of the furnace body before the scraps are supplied to the furnace body, the scrap preheating and charging furnace being provided on one side of the furnace body; a main exhaust line for connecting the exhaust port of the furnace body to an exhaust unit having a suction fan; and an exhaust gas recirculation unit for supplying a part of the hot exhaust gas discharged through the main exhaust line to the scrap preheating and charging furnace.

Description

전기 아크로 및 전기 아크로의 스크랩 예열 방법Method of preheating scrap in electric arc furnaces and electric arc furnaces
본 발명은 전기 아크로(ELECTRIC ARC FURNACES)에 관한 것으로, 좀 더 구체적으로는 로 본체로부터 방출되는 고온의 배기가스를 스크랩 예열용으로 재사용하는 전기 아크로 및 전기 아크로의 스크랩 예열 방법에 관한 것이다. The present invention relates to an electric arc furnace (ELECTRIC ARC FURNACES), and more particularly to an electric arc furnace and a method of scrap preheating of the electric arc furnace to reuse the hot exhaust gas emitted from the furnace body for the preheating of the scrap.
제철 공정은 철광석을 원료로 하는 고로(Blast furnace steelmaking:용광로) 방식과 철 스크랩을 원료로 재활용하는 전기 아크로 방식 (Electric arc furnace steelmaking)이 있다. 전기 아크로 방식의 에너지 소비는 고로 방식 대비 40%, 이산화탄소 배출량은 30% 수준이다. 즉, 전기 아크로 방식은 고로 방식에 비해 코크스 공정과 소결 공정이 없어 제강 프로세스가 간단하고 총 에너지(전기+연료) 소비 및 탄소배출량이 적은 장점이 있는 반면, 고온의 아크를 생성시켜 고철 원료를 용융시키기 위해 막대한 양의 전력을 소비한다. There are two types of steelmaking processes: blast furnace steelmaking (iron blast furnace) and electric arc furnace steelmaking (recycling iron scrap). Electric arc furnace energy consumption is 40% compared to blast furnace method, and carbon dioxide emissions are 30%. In other words, the electric arc furnace method has the advantages of simpler steelmaking process, less total energy (electric + fuel) consumption and less carbon emission, as there is no coke process and sintering process compared to the blast furnace method, while melting the scrap iron raw materials by generating high temperature arc It consumes a tremendous amount of power to make it work.
국내 전기 아크로 최대 총 전력수요는 300만kW, 총 전력소비량은 10,400GWh/년으로 최근 “blackout” 현상, 반복되는 국가적 전력수급 위기의 완화와 전력 수요관리에 따른 기간산업 분야 생산 활동 저해요인을 해소하기 위하여 전기 아크로의 고효율화 기술이 요구되는 상황이다.Domestic electric arc furnace's maximum electric power demand is 3 million kW and total electric power consumption is 10,400 GWh / year, which eliminates the obstacles to production activities in the key industry sector due to the recent “blackout” phenomenon, mitigation of repeated national power supply and demand and electric power demand management. In order to achieve high efficiency of electric arc furnace technology is required.
본 발명의 목적은 전기 아크로의 전력 원단위 및 에너지 원단위 저감을 위해 미활용 잠재 열에너지 활용을 극대화할 수 있는 전기 아크로 및 전기 아크로의 스크랩 예열 방법을 제공하는데 있다.It is an object of the present invention to provide an electric arc furnace and a method of preheating scrap of an electric arc furnace capable of maximizing the utilization of unutilized potential thermal energy for reducing electric power unit and energy unit of the electric arc furnace.
본 발명의 목적은 배가스 미반응열 및 현열을 이용해 스크랩을 고온으로 예열할 수 있는 전기 아크로 및 전기 아크로의 스크랩 예열 방법을 제공하는데 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide an electric arc furnace and a method of preheating scrap of an electric arc furnace which can preheat the scrap to a high temperature using flue gas unreacted heat and sensible heat.
본 발명의 목적은 미반응 배가스의 순산소(Oxy-fule)연소 기술 및 열회수를 활용하여 에너지를 절감할 수 있는 전기 아크로 및 전기 아크로의 스크랩 예열 방법을 제공하는데 있다.An object of the present invention is to provide an electric arc furnace and a scrap preheating method of the electric arc furnace that can save energy by utilizing the oxygen-fule combustion technology and heat recovery of unreacted flue gas.
본 발명의 목적은 배가스를 추가적인 동력 투입 없이 스크랩 예열용으로 재순환시킬 수 있는 전기 아크로 및 전기 아크로의 스크랩 예열 방법을 제공하는데 있다.It is an object of the present invention to provide an electric arc furnace and a method of preheating scrap of an electric arc furnace which can recycle the exhaust gas for scrap preheating without additional power input.
본 발명의 목적은 스크랩 예열용으로 사용된 배가스를 다시 전기 아크로 본체 내로 재순환시켜 열분해함으로써 스크랩 예열시 발생되는 악취를 제거할 수 있는 전기 아크로 및 전기 아크로의 스크랩 예열 방법을 제공하는데 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide an electric arc furnace and a method of preheating scrap of an electric arc furnace capable of removing odor generated during scrap preheating by pyrolyzing the exhaust gas used for scrap preheating back into the electric arc furnace body.
본 발명의 목적은 스크랩 투입시 배기가스가 외부로 유출되는 것을 방지할 수 있는 전기 아크로 및 전기 아크로의 스크랩 예열 방법을 제공하는데 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide an electric arc furnace and a method of preheating scrap of an electric arc furnace, which can prevent the exhaust gas from flowing out when the scrap is introduced.
본 발명이 해결하고자 하는 과제는 여기에 제한되지 않으며, 언급되지 않은 또 다른 과제들은 아래의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다. The problem to be solved by the present invention is not limited thereto, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.
본 발명의 일 측면에 따르면, 용융될 스크랩을 수용하기 위한 원통형의 용기와 상기 용기의 상부를 덮는 용기 커버를 갖는 로 본체; 상기 로 본체의 일측에 구비되며, 내부에 상기 로 본체로 공급될 스크랩이 저장되고, 상기 로 본체의 배기포트로부터 방출된 고온의 배기가스의 일부가 유입되어 상기 로 본체로 공급되기 전 스크랩을 예열하는 스크랩 예열 장입로; 상기 로 본체의 배기포트와 흡인팬을 구비한 배기부를 연결되는 메인 배기라인; 및 상기 메인 배기라인을 통해 배기되는 고온의 배기가스의 일부를 상기 스크랩 예열 장입로로 공급하는 배기가스 재순환부를 포함하는 전기 아크로를 제공하고자 한다. According to an aspect of the invention, the furnace body having a cylindrical container for receiving the scrap to be melted and a container cover covering the top of the container; It is provided on one side of the furnace body, the scrap to be supplied to the furnace body is stored therein, and a portion of the hot exhaust gas discharged from the exhaust port of the furnace body is introduced to preheat the scrap before being supplied to the furnace body Scrap preheating furnace; A main exhaust line connecting the exhaust port of the furnace body and an exhaust unit having a suction fan; And it is to provide an electric arc furnace including an exhaust gas recirculation unit for supplying a portion of the high-temperature exhaust gas exhausted through the main exhaust line to the scrap preheating charging path.
또한, 상기 배기가스 재순환부는 상기 메인 배기라인으로부터 분기되고 상기 스크랩 예열 장입로와 연결되는 순환 배기라인; 및 상기 메인 배기라인에서 발생되는 흡입압력에 의해 회전되는 워크 임펠러; 및 상기 순환 배기라인에 설치되고, 상기 워크 임펠러로부터 동력을 전달받아 상기 순환 배기라인에 순환 기류를 생성하는 아이들링 임펠러를 포함할 수 있다.The exhaust gas recirculation unit may further include a circulation exhaust line branched from the main exhaust line and connected to the scrap preheating charging path; And a work impeller rotated by the suction pressure generated in the main exhaust line. And an idling impeller installed in the circulation exhaust line and receiving power from the work impeller to generate circulation airflow in the circulation exhaust line.
또한, 상기 배기가스 재순환부는 상기 워크 임펠러로부터 상기 아이들링 임펠러로 전달되는 동력을 단속하는 클러치를 더 포함할 수 있다.In addition, the exhaust gas recirculation unit may further include a clutch to control the power transmitted from the work impeller to the idling impeller.
또한, 상기 메인 배기라인으로 유입되는 배기가스의 온도를 측정하는 온도측정수단을 더 포함하고, 상기 배기가스 재순환부는 상기 온도측정수단에서 측정된 값을 기반으로 상기 워크 임펠러로부터 상기 아이들링 임펠러로 전달되는 동력을 제어하는 제어부를 도록 상기 클러치 동력전달을 제어하는 클러치 제어부를 더 포함할 수 있다.The apparatus may further include temperature measuring means for measuring a temperature of the exhaust gas flowing into the main exhaust line, wherein the exhaust gas recirculating part is transferred from the work impeller to the idling impeller based on the value measured by the temperature measuring means. It may further include a clutch control unit for controlling the clutch power transmission to the control unit for controlling the power.
또한, 상기 전기 아크로는 상기 워크 임펠러와 상기 로 본체의 배기포트 사이의 상기 메인 배기라인에 연결되고, 상기 로 본체의 배기포트로부터 방출되는 배기가스의 온도 및 압력 변화에 따라 상기 워크 임펠러로 유입되는 배기가스의 온도 및 압력이 일정하게 유지되도록 상기 메인 배기라인에 에어를 공급하는 제어용 에어 공급라인을 더 포함할 수 있다.The electric arc furnace is connected to the main exhaust line between the work impeller and the exhaust port of the furnace body, and flows into the work impeller according to a change in temperature and pressure of exhaust gas discharged from the exhaust port of the furnace body. It may further include a control air supply line for supplying air to the main exhaust line so that the temperature and pressure of the exhaust gas is kept constant.
또한, 상기 배기가스 재순환부는 상기 순환 배기라인에 설치되고, 배기가스를 연소시켜 화학적 열에너지를 확보하기 위한 보조 버너를 더 포함할 수 있다.In addition, the exhaust gas recirculation unit may be installed in the circulating exhaust line, and may further include an auxiliary burner for burning the exhaust gas to secure chemical thermal energy.
또한, 상기 메인 배기라인에 설치된 상기 워크 임펠러를 우회하는 바이패스 라인을 더 포함할 수 있다.The apparatus may further include a bypass line bypassing the work impeller installed in the main exhaust line.
본 발명의 일 측면에 따르면, 로 본체 내로 스크랩을 장입하여 용융하는 단계; 상기 로 본체 내의 스크랩 용융 과정에서 발생되는 배기가스를 메인 배기라인을 통해 배기하는 단계; 및 상기 메인 배기라인으로부터 배기되는 배기 가스의 일부를 상기 로 본체로 공급될 스크랩이 저장된 스크랩 예열 장입로로 재순환시켜 스크랩을 예열하는 단계를 포함하는 전기 아크로의 스크랩 예열 방법을 제공하고자 한다. According to an aspect of the invention, the step of charging the scrap into the furnace body to melt; Exhausting the exhaust gas generated during the scrap melting process in the furnace body through a main exhaust line; And preheating the scrap by recycling a portion of the exhaust gas exhausted from the main exhaust line to a scrap preheating charging furnace in which the scrap to be supplied to the furnace body is stored.
또한, 상기 스크랩 예열 단계는 상기 메인 배기라인에서 발생되는 흡입압력에 의해 회전되는 워크 임펠러로부터 동력을 전달받은 아이들링 임펠러가 회전하면서 상기 스크랩 예열 장입로로 재순환되는 배기가스의 순환기류를 제공할 수 있다.In addition, the scrap preheating step may provide a circulating air stream of the exhaust gas recycled to the scrap preheating charge while rotating the idling impeller received power from the work impeller rotated by the suction pressure generated in the main exhaust line. .
또한, 상기 스크랩 예열 단계에서 상기 워크 임펠러로부터 상기 아이들링 임펠러로 전달되는 동력은 클러치에 의해 단속될 수 있다.In addition, the power transmitted from the work impeller to the idling impeller in the scrap preheating step may be interrupted by a clutch.
또한, 상기 스크랩 예열 단계는 상기 스크랩 예열 장입로로 재순환되는 배기가스의 온도가 낮은 경우 배기가스를 연소시켜 화학적 열에너지를 확보할 수 있다.In addition, the scrap preheating step may secure chemical thermal energy by burning the exhaust gas when the temperature of the exhaust gas recycled to the scrap preheating charging path is low.
또한, 상기 배기 단계는 상기 로 본체로부터 방출되는 배기가스의 온도 및 압력이 낮은 경우 상기 워크 임펠러로 유입되는 배기가스의 온도 및 압력이 일정하게 유지되도록 상기 메인 배기라인에 에어를 추가 공급할 수 있다.In addition, the exhausting step may further supply air to the main exhaust line so that the temperature and pressure of the exhaust gas flowing into the work impeller is kept constant when the temperature and pressure of the exhaust gas discharged from the furnace body is low.
또한, 상기 전기 아크로의 스크랩 예열 방법은 상기 로 본체 내로 스크랩 추가 투입시 상기 스크랩 예열 장입로를 통한 배기가스 유출을 방지하도록 상기 아이들링 임펠러의 가동을 중지하여 상기 스크랩 예열 장입로의 내부 압력을 음압으로 만들 수 있다. In addition, the scrap preheating method of the electric arc furnace is to stop the operation of the idling impeller so as to prevent the exhaust gas flow through the scrap preheating charge when additional scrap into the furnace body to the negative pressure to the internal pressure of the scrap preheating charge path I can make it.
본 발명의 실시예에 의하면, 용강 제조시 발생되는 고온의 배기가스를 추가적인 동력 투입 없이 스크랩을 예열시키고 다시 로 내부로 재순환시킴으로써 미활용 잠재 열에너지 활용을 극대화할 수 있는 각별한 효과를 갖는다. According to an embodiment of the present invention, the hot exhaust gas generated during molten steel is preheated without additional power input and recycled back into the furnace, thereby having a special effect of maximizing the utilization of unutilized potential thermal energy.
본 발명의 실시예에 의하면, 미반응 배가스의 순산소(Oxy-fule)연소 기술 및 열회수를 활용하여 에너지를 절감할 수 있다.According to an embodiment of the present invention, energy can be saved by utilizing oxygen-fule combustion technology and heat recovery of unreacted flue gas.
본 발명의 실시예에 의하면, 스크랩 예열용으로 사용된 배기가스를 다시 전기 아크로 본체 내로 재순환시켜 열분해함으로써 스크랩 예열시 발생되는 악취를 제거할 수 있다.According to an embodiment of the present invention, the odor generated during scrap preheating can be removed by recycling the exhaust gas used for the preheating of the scrap into the electric arc furnace body and pyrolyzing it.
본 발명의 실시예에 의하면 스크랩 추가 투입시 배기가스가 외부로 유출되는 것을 방지할 수 있다. According to an embodiment of the present invention, it is possible to prevent the exhaust gas from flowing out when additional scrap is added.
도 1은 본 발명에 따른 전기 아크로를 설명하기 위한 평면도이다. 1 is a plan view for explaining an electric arc furnace according to the present invention.
도 2는 도 1에 도시된 전기 아크로의 측면도이다.FIG. 2 is a side view of the electric arc furnace shown in FIG. 1.
도 3은 도 1에 도시된 전기 아크로의 배기 가스 흐름을 보여주는 구성도이다.FIG. 3 is a schematic view showing the exhaust gas flow of the electric arc furnace shown in FIG. 1.
도 4는 전기 아크로에서의 스크랩 예열 과정을 보여주는 플로우챠트이다. 4 is a flowchart showing a scrap preheating process in an electric arc furnace.
본 발명은 다양한 변환을 가할 수 있고 여러 가지 실시 예를 가질 수 있는 바, 특정 실시 예들을 도면에 예시하고 상세한 설명에서 상세하게 설명하고자 한다. 그러나, 이는 본 발명을 특정한 실시 형태에 대해 한정하려는 것이 아니며, 본 발명의 사상 및 기술 범위에 포함되는 모든 변환, 균등물 내지 대체물을 포함하는 것으로 이해되어야 한다. 본 발명을 설명함에 있어서 관련된 공지 기술에 대한 구체적인 설명이 본 발명의 요지를 흐릴 수 있다고 판단되는 경우 그 상세한 설명을 생략한다. As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.
본 출원에서 사용한 용어는 단지 특정한 실시예를 설명하기 위해 사용된 것으로, 본 발명을 한정하려는 의도가 아니다. 단수의 표현은 문맥상 명백하게 다르게 뜻하지 않는 한, 복수의 표현을 포함한다. 본 출원에서, "포함하다" 또는 "가지다" 등의 용어는 명세서상에 기재된 특징, 숫자, 단계, 동작, 구성요소, 부품 또는 이들을 조합한 것이 존재함을 지정하려는 것이지, 하나 또는 그 이상의 다른 특징들이나 숫자, 단계, 동작, 구성요소, 부품 또는 이들을 조합한 것들의 존재 또는 부가 가능성을 미리 배제하지 않는 것으로 이해되어야 한다.The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.
제1, 제2 등의 용어는 다양한 구성요소들을 설명하는데 사용될 수 있지만, 상기 구성요소들은 상기 용어들에 의해 한정되어서는 안 된다. 상기 용어들은 하나의 구성요소를 다른 구성요소로부터 구별하는 목적으로만 사용된다.Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
이하, 첨부한 도면들을 참조하여 본 발명에 따른 실시예들을 상세히 설명하기로 하며, 첨부 도면을 참조하여 설명함에 있어 도면 부호에 상관없이 동일하거나 대응하는 구성 요소는 동일한 참조번호를 부여하고 이에 대한 중복되는 설명은 생략하기로 한다. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and in describing the present invention with reference to the accompanying drawings, the same or corresponding elements are denoted by the same reference numerals regardless of the reference numerals, and duplicates thereof. The description will be omitted.
( 실시 예 )(Example)
도 1 및 도 2는 본 발명에 따른 전기 아크로를 설명하기 위한 평면도 및 측면도이다. 도 3은 도 1에 도시된 전기 아크로의 배기 가스 흐름을 보여주는 구성도이다.1 and 2 are a plan view and a side view for explaining the electric arc furnace according to the present invention. FIG. 3 is a schematic view showing the exhaust gas flow of the electric arc furnace shown in FIG. 1.
본 발명의 실시예에 따른 전기 아크로는 전기양도체인 전극에 전류를 통함으로써 전극과 철 스크랩(이하 스크랩이라고 함) 사이에 발생하는 아크(ARC) 열에 의하여 스크랩을 용해, 정련하여 강을 제조하는 설비이다.An electric arc furnace according to an embodiment of the present invention is a facility for manufacturing steel by melting and refining scrap by arc (ARC) heat generated between the electrode and the iron scrap (hereinafter referred to as scrap) by passing an electric current through the electrode, which is an electrical conductor. to be.
도 1 내지 도 3을 참조하면, 전기 아크로(10)는 로 본체(100), 스크랩 예열 장입로(200), 메인 배기라인(300), 배기가스 재순환부(400) 그리고 배기부(500)를 포함한다.1 to 3, the electric arc furnace 10 includes a furnace main body 100, a scrap preheating charging path 200, a main exhaust line 300, an exhaust gas recirculation unit 400, and an exhaust unit 500. Include.
로 본체(100)는 용융될 스크랩을 수용하기 위한 원통형의 용기(110)와, 용기(110)의 개방된 상부를 폐쇄하는 용기 커버(120)를 포함한다.  The furnace body 100 includes a cylindrical container 110 for accommodating scrap to be melted and a container cover 120 for closing the open top of the container 110.
용기 커버(120)는 수냉식으로 제공되며, 용기 커버(120)의 중심에는 용융공정을 위해 3개의 전극(130)이 수직하게 관통되어 설치된다. 전극(130)은 로 본체(10) 내에서 상하로 움직일 수 있으며, 전극(130)은 3상의 교류전원에 연결될 수 있다. 용기 커버(120)의 중심에서 어긋한 위치에는 배기가스가 배출되는 배기포트(140)가 설치되어 있다. 도시하지 않았지만, 용기 커버 주위 및 전극 주위에는 시일재를 부착하여 간극을 없애고 외부로부터 로 본체내에 공기가 침입하지 않게 하고 있다. The container cover 120 is provided in a water-cooled manner, and three electrodes 130 are vertically penetrated in the center of the container cover 120 for the melting process. The electrode 130 may move up and down within the furnace body 10, and the electrode 130 may be connected to an AC power source of three phases. An exhaust port 140 through which exhaust gas is discharged is provided at a position shifted from the center of the container cover 120. Although not shown, a sealing material is attached around the container cover and around the electrode to eliminate the gap and prevent air from entering the furnace body from the outside.
한편, 용기(110)는 일측면에 스크랩을 투입하기 위한 스크랩 투입 포트(190)가 제공된다. 스크랩 투입 포트(190)에는 스크랩 예열 장입로(200)가 연결 설치된다. 도시하지 않았지만, 용기(110)에는 슬래그를 배출할 할 수 있는 슬래그 배출구와 용강을 배출할 수 있는 용강배출구가 제공될 수 있다. On the other hand, the container 110 is provided with a scrap input port 190 for injecting scrap on one side. The scrap input port 190 is connected to the scrap preheating charging path 200. Although not shown, the container 110 may be provided with a slag outlet for discharging slag and a molten steel outlet for discharging molten steel.
스크랩 예열 장입로(200)는 스크랩 투입 포트(190)와 연결된다. 스크랩 예열 장입로(200)는 내부에 로 본체(100)로 공급될 스크랩(S)이 적재되고, 로 본체(100)의 배기포트(140)로부터 방출된 고온의 배기가스의 일부가 유입되어 로 본체(100)로 공급되기 전 스크랩(S)을 예열 처리한다. The scrap preheating charge passage 200 is connected to the scrap input port 190. The scrap preheating charging path 200 is loaded with scrap S to be supplied to the furnace body 100 therein, and a portion of the hot exhaust gas discharged from the exhaust port 140 of the furnace body 100 flows into the furnace. The scrap S is preheated before being supplied to the main body 100.
일 예로, 스크랩 예열 장입로(200)는 일단이 스크랩 투입 포트(190)에 경사지게 연결되는 경사부분(210)과, 경사부분(210)의 타단으로부터 거의 수직한 상방향으로 연장되어 형성되고 상부에 스크랩(S)이 투입되는 개구가 형성된 프리 히팅부분(220)을 포함한다. For example, the scrap preheating charging path 200 is formed with an inclined portion 210, one end of which is inclinedly connected to the scrap input port 190, and is formed to extend in a substantially vertical upward direction from the other end of the inclined portion 210. It includes a pre-heating portion 220 is formed an opening into which the scrap (S) is introduced.
경사부분(210)에는 스크랩(S)을 스크랩 투입 포트(190)로 밀어 공급하는 푸셔 장치(290)가 설치된다, 푸셔 장치(290)는 실린더 등의 구동장치(292)에 의해 작동하는 푸셔(294)를 포함한다. The inclined portion 210 is provided with a pusher device 290 for pushing the scrap (S) to the scrap input port 190, the pusher device 290 is a pusher (operated by a drive device 292, such as a cylinder ( 294).
프리 히팅부분(220)의 개구는 도어(230)에 의해 개폐된다. 도어(230)가 설치된 바로 아래에는 배기가스 재순환부(400)의 순환 배기 라인(410)이 연결되어 고온의 배기가스가 프리 히팅부분(220)으로 공급된다. The opening of the pre-heating part 220 is opened and closed by the door 230. Directly below the door 230 is installed, the circulating exhaust line 410 of the exhaust gas recirculation unit 400 is connected to supply the hot exhaust gas to the preheating part 220.
즉, 스크랩 예열 장입로(200)에서는 스크랩(S)이 개방된 개구를 통해 투입되어 프리 히팅부분(220)에 퇴적된다. 그리고, 순환 배기 라인(410)을 통해 공급되는 고온의 배기가스에 의해서 효과적으로 예열된다. 이렇게 예열된 스크랩(S)은 푸셔 장치의 푸셔에 의해 스크랩 투입 포트를 통해 로 본체로 공급된다.That is, in the scrap preheating charging path 200, the scrap S is introduced through the open opening and deposited on the preheating part 220. And, it is effectively preheated by the high temperature exhaust gas supplied through the circulation exhaust line 410. The preheated scrap S is supplied to the furnace body through the scrap input port by the pusher of the pusher device.
메인 배기라인(300)은 로 본체(100)의 배기포트(140)와 배기부(500)를 연결한다. 로 본체(100)에서 발생되는 배기가스는 배기부(500)에서 제공되는 흡입력에 의해 배기 포트(140)와 연결된 메인 배기라인(300)을 통해 배기부(500)로 제공되어 외부로 배기된다. 배기부(500)는 흡인팬(510)과 집진기(520) 등을 포함할 수 있다. The main exhaust line 300 connects the exhaust port 140 and the exhaust part 500 of the furnace body 100. The exhaust gas generated in the furnace body 100 is provided to the exhaust unit 500 through the main exhaust line 300 connected to the exhaust port 140 by the suction force provided from the exhaust unit 500 and exhausted to the outside. The exhaust part 500 may include a suction fan 510 and a dust collector 520.
한편, 메인 배기라인(300)에는 비상시 워크 임펠러를 우회하는 바이패스 라인(380)이 설치된다. On the other hand, the main exhaust line 300 is provided with a bypass line 380 bypassing the work impeller in an emergency.
배기가스 재순환부(400)는 메인 배기라인(300)을 통해 배기되는 고온의 배기가스의 일부를 스크랩 예열 장입로(200)로 공급하기 위해 제공된다. 배기가스 재순환부(400)는 순환 배기라인(410), 워크 임펠러(420), 아이들링 임펠러(430), 클러치(440), 클러치 제어부(450), 보조 버너(460), 제어용 에어 공급라인(470)을 포함한다.The exhaust gas recirculation unit 400 is provided to supply a portion of the high temperature exhaust gas exhausted through the main exhaust line 300 to the scrap preheating charging path 200. The exhaust gas recirculation unit 400 includes a circulating exhaust line 410, a work impeller 420, an idling impeller 430, a clutch 440, a clutch control unit 450, an auxiliary burner 460, and a control air supply line 470. ).
순환 배기라인(410)은 메인 배기라인(300)으로부터 분기되고 스크랩 예열 장입로(200)와 연결된다. 워크 임펠러(420)는 메인 배기라인(300) 상에 설치되어, 메인 배기라인(300)에서 발생되는 흡입압력에 의해 회전된다. 아이들링 임펠러(430)는 순환 배기라인(410)상에 설치된다. 아이들링 임펠러(430)는 워크 임펠러(420)로부터 동력을 전달받아 순환 배기라인(410)에 순환 기류를 생성한다. 워크 임펠러(420)로부터 아이들링 임펠러(430)로의 동력 전달은 클러치(440)에 의해 제공된다. The circulating exhaust line 410 branches from the main exhaust line 300 and is connected to the scrap preheating charging path 200. The work impeller 420 is installed on the main exhaust line 300 and rotated by the suction pressure generated in the main exhaust line 300. The idling impeller 430 is installed on the circulation exhaust line 410. The idling impeller 430 receives power from the work impeller 420 to generate circulating airflow in the circulating exhaust line 410. Power transmission from the work impeller 420 to the idling impeller 430 is provided by the clutch 440.
이처럼, 배기가스 재순환부(400)는 배기가스의 재순환에 필요한 동력을 메인 배기라인(300)의 흡입압력을 이용함으로써 추가적인 동력 투입 없이 배기가스를 재순환시킬 수 있다. As such, the exhaust gas recirculation unit 400 may recycle the exhaust gas without additional power by using the suction pressure of the main exhaust line 300 as the power required for the exhaust gas recirculation.
클러치 제어부(450)는 배기가스의 온도에 따라 클러치(440)를 제어한다. 즉, 클러치 제어부(450)는 메인 배기라인(300)에 설치된 온도측정수단(452)에서 측정된 배기가스의 온도 측정값을 기반으로 워크 임펠러(420)로부터 아이들링 임펠러(430)로 전달되는 동력을 제어한다. 일 예, 클러치 제어부(450)는 초기 가동시 배기가스의 온도가 낮으면 클러치(440)를 통한 동력 전달을 차단하고, 배기가스의 온도가 기설정 온도 이상으로 상승되면 워크 임펠러(420)로부터 아이들링 임펠러(430)로의 동력 전달이 이루어지도록 클러치(440)를 제어한다. 여기서, 기설정 온도는 스크랩을 예열할 수 있는 정도의 예열 가능 온도(예를 들면 1100℃)일 수 있다. The clutch controller 450 controls the clutch 440 according to the temperature of the exhaust gas. That is, the clutch controller 450 may transmit power transmitted from the work impeller 420 to the idling impeller 430 based on the temperature measurement value of the exhaust gas measured by the temperature measuring means 452 installed in the main exhaust line 300. To control. For example, the clutch controller 450 blocks power transmission through the clutch 440 when the temperature of the exhaust gas is low during initial operation, and idling from the work impeller 420 when the temperature of the exhaust gas rises above a predetermined temperature. The clutch 440 is controlled to transmit power to the impeller 430. Here, the preset temperature may be a preheatable temperature (for example, 1100 ° C.) that is sufficient to preheat the scrap.
보조 버너(460)는 순환 배기라인에 설치된다. 좀 더 구체적으로, 보조 버너(460)는 아이들링 임펠러(430)와 스크랩 예열 장입로(200) 사이를 연결하는 순환 배기라인(410) 상에 설치된다. 보조 버너(460)는 스크랩 예열이 배기가스의 현열만으로 부족할 경우 배기가스의 Co, H 등을 연소시켜 화학적 열에너지를 확보하기 위해 제공된다. The auxiliary burner 460 is installed in the circulation exhaust line. More specifically, the auxiliary burner 460 is installed on the circulating exhaust line 410 connecting between the idling impeller 430 and the scrap preheating charging path 200. The auxiliary burner 460 is provided to secure chemical thermal energy by burning Co, H, etc. of the exhaust gas when the scrap preheating is insufficient only by the sensible heat of the exhaust gas.
제어용 에어 공급라인(470)은 워크 임펠러(420)와 로 본체(100)의 배기포트(140) 사이의 메인 배기라인(300)에 연결된다. 제어용 에어 공급 라인(470)은 로 본체(100)의 배기포트(140)로부터 방출되는 배기가스의 온도 및 압력 변화에 따라 워크 임펠러(420)로 유입되는 배기가스의 온도 및 압력이 일정하게 유지되도록 메인 배기라인(300)에 에어를 추가 공급한다. 추가되는 에어는 상온의 에어 또는 가열된 에어일 수 있다. 도시하지 않았지만, 메인 배기라인(300)의 압력은 댐퍼(미도시됨)를 이용하여 조절할 수 있다. The control air supply line 470 is connected to the main exhaust line 300 between the work impeller 420 and the exhaust port 140 of the furnace body 100. The control air supply line 470 maintains a constant temperature and pressure of the exhaust gas flowing into the work impeller 420 according to a change in the temperature and pressure of the exhaust gas emitted from the exhaust port 140 of the furnace body 100. Air is additionally supplied to the main exhaust line 300. The air added may be room temperature air or heated air. Although not shown, the pressure of the main exhaust line 300 may be adjusted using a damper (not shown).
전기 아크로(10)는 스크랩 예열 장입로(200)를 통한 스크랩 추가 투입시 아이들링 임펠러(430)의 가동을 중단한 상태에서 도어를 오픈하여 스크랩을 추가 투입하게 된다. 즉, 임펠러의 가동이 중단되어 순환 배기라인(410)을 통한 배기가스 공급이 중단되면 로 본체(100) 압력이 음압이 되기 때문에 스크랩 예열 장입로(200)의 도어를 오픈하더라도 로 본체(100)의 배기가스가 스크랩 예열 장입로(200)의 개구를 통해 외부로 유출되지 않는다. The electric arc furnace 10 is to add the scrap by opening the door in the state of stopping the operation of the idling impeller 430 at the time of additional scrap input through the scrap preheating charging path (200). That is, since the pressure of the furnace main body 100 becomes negative when the supply of the exhaust gas through the circulation exhaust line 410 is stopped because the operation of the impeller is stopped, the furnace main body 100 is opened even when the door of the scrap preheating charging path 200 is opened. Exhaust gas does not flow to the outside through the opening of the scrap preheating charging path (200).
상술한 전기 아크로에서의 스크랩 예열 방법을 설명하면 다음과 같다.The scrap preheating method in the electric arc furnace described above will be described.
도 4는 전기 아크로에서의 스크랩 예열 과정을 보여주는 플로우챠트이다. 4 is a flowchart showing a scrap preheating process in an electric arc furnace.
도 3 내지 도 4를 참조하면, 스크랩 예열 방법은 로 본체(100) 내로 스크랩(S)을 장입하여 용융하는 단계(S100)와, 로 본체(100) 내의 스크랩 용융 과정에서 발생되는 배기가스를 메인 배기라인(300)을 통해 배기하는 단계(S200) 및 메인 배기라인(300)으로부터 배기되는 배기 가스의 일부를 로 본체(100)로 공급될 스크랩(S)이 저장된 스크랩 예열 장입로(200)로 재순환시켜 스크랩을 예열하는 단계(S300)를 포함한다. 3 to 4, the scrap preheating method includes charging the scrap S into the furnace body 100 and melting it (S100), and exhaust gas generated in the scrap melting process in the furnace body 100. Exhausting through the exhaust line 300 (S200) and a portion of the exhaust gas exhausted from the main exhaust line 300 to the scrap preheating charging path 200 in which the scrap (S) to be supplied to the furnace body 100 is stored. Recirculating and preheating the scrap (S300).
스크랩 예열 단계(S300)는 메인 배기라인(300)에서 발생되는 흡입압력에 의해 회전되는 워크 임펠러(420)로부터 동력을 전달받은 아이들링 임펠러(430)가 회전하면서 스크랩 예열 장입로(200)로 재순환되는 배기가스의 순환기류를 제공한다. 스크랩 예열 장입로(200)로 재순환되는 배기가스의 온도가 낮은 경우 보조버너(460)를 사용하여 배기가스를 연소시켜 화학적 열에너지를 확보할 수 있다. The scrap preheating step (S300) is recycled to the scrap preheating charging path (200) while the idling impeller (430) powered by the work impeller (420) rotated by the suction pressure generated in the main exhaust line (300) rotates. Provides a circulation air stream of the exhaust gas. When the temperature of the exhaust gas recycled to the scrap preheating charging furnace 200 is low, the auxiliary burner 460 may be used to burn the exhaust gas to secure chemical thermal energy.
배기 단계(S200)는 로 본체(100)로부터 방출되는 배기가스의 온도 및 압력이 낮은 경우 워크 임펠러(420)로 유입되는 배기가스의 온도 및 압력이 일정하게 유지되도록 제어용 에어 공급라인(470)을 통해 메인 배기라인(300)으로 에어를 추가 공급할 수 있다.Exhaust step (S200) is a control air supply line 470 so that the temperature and pressure of the exhaust gas flowing into the work impeller 420 is kept constant when the temperature and pressure of the exhaust gas discharged from the furnace body 100 is low Air may be further supplied to the main exhaust line 300 through.
이상의 설명은 본 발명의 기술 사상을 예시적으로 설명한 것에 불과한 것으로서, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 본 발명의 본질적인 특성에서 벗어나지 않는 범위에서 다양한 수정 및 변형이 가능할 것이다. 따라서, 본 발명에 개시된 실시 예들은 본 발명의 기술 사상을 한정하기 위한 것이 아니라 설명하기 위한 것이고, 이러한 실시 예에 의하여 본 발명의 기술 사상의 범위가 한정되는 것은 아니다. 본 발명의 보호 범위는 아래의 청구범위에 의하여 해석되어야 하며, 그와 동등한 범위 내에 있는 모든 기술 사상은 본 발명의 권리범위에 포함되는 것으로 해석되어야 할 것이다.The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (13)

  1. 전기 아크로에 있어서:In electric arc furnace:
    용융될 스크랩을 수용하기 위한 원통형의 용기와 상기 용기의 상부를 덮는 용기 커버를 갖는 로 본체; A furnace body having a cylindrical container for containing scrap to be melted and a container cover covering the top of the container;
    상기 로 본체의 일측에 구비되며, 내부에 상기 로 본체로 공급될 스크랩이 저장되고, 상기 로 본체의 배기포트로부터 방출된 고온의 배기가스의 일부가 유입되어 상기 로 본체로 공급되기 전 스크랩을 예열하는 스크랩 예열 장입로; It is provided on one side of the furnace body, the scrap to be supplied to the furnace body is stored therein, and a portion of the hot exhaust gas discharged from the exhaust port of the furnace body is introduced to preheat the scrap before being supplied to the furnace body Scrap preheating furnace;
    상기 로 본체의 배기포트와 흡인팬을 구비한 배기부를 연결되는 메인 배기라인; 및A main exhaust line connecting the exhaust port of the furnace body and an exhaust unit having a suction fan; And
    상기 메인 배기라인을 통해 배기되는 고온의 배기가스의 일부를 상기 스크랩 예열 장입로로 공급하는 배기가스 재순환부를 포함하는 것을 특징으로 하는 전기 아크로.And an exhaust gas recirculation unit for supplying a portion of the high temperature exhaust gas exhausted through the main exhaust line to the scrap preheating charging path.
  2. 제 1 항에 있어서,The method of claim 1,
    상기 배기가스 재순환부는The exhaust gas recirculation unit
    상기 메인 배기라인으로부터 분기되고 상기 스크랩 예열 장입로와 연결되는 순환 배기라인; 및A circulating exhaust line branching from the main exhaust line and connected to the scrap preheating charging path; And
    상기 메인 배기라인에서 발생되는 흡입압력에 의해 회전되는 워크 임펠러; 및A work impeller rotated by the suction pressure generated in the main exhaust line; And
    상기 순환 배기라인에 설치되고, 상기 워크 임펠러로부터 동력을 전달받아 상기 순환 배기라인에 순환 기류를 생성하는 아이들링 임펠러를 포함하는 것을 특징으로 하는 전기 아크로.And an idling impeller installed in the circulation exhaust line and receiving power from the work impeller to generate circulation airflow in the circulation exhaust line.
  3. 제 2 항에 있어서,The method of claim 2,
    상기 배기가스 재순환부는 The exhaust gas recirculation unit
    상기 워크 임펠러로부터 상기 아이들링 임펠러로 전달되는 동력을 단속하는 클러치를 더 포함하는 것을 특징으로 하는 전기 아크로.The electric arc furnace, characterized in that it further comprises a clutch for regulating the power transmitted from the work impeller to the idling impeller.
  4. 제 2 항에 있어서,The method of claim 2,
    상기 메인 배기라인으로 유입되는 배기가스의 온도를 측정하는 온도측정수단을 더 포함하고,Further comprising a temperature measuring means for measuring the temperature of the exhaust gas flowing into the main exhaust line,
    상기 배기가스 재순환부는The exhaust gas recirculation unit
    상기 온도측정수단에서 측정된 값을 기반으로 상기 워크 임펠러로부터 상기 아이들링 임펠러로 전달되는 동력을 제어하는 제어부를 도록 상기 클러치 동력전달을 제어하는 클러치 제어부를 더 포함하는 것을 특징으로 하는 전기 아크로. And a clutch control unit for controlling the clutch power transmission so that the control unit controls the power transmitted from the work impeller to the idling impeller based on the value measured by the temperature measuring means.
  5. 제 2 항에 있어서,The method of claim 2,
    상기 전기 아크로는The electric arc furnace
    상기 워크 임펠러와 상기 로 본체의 배기포트 사이의 상기 메인 배기라인에 연결되고, 상기 로 본체의 배기포트로부터 방출되는 배기가스의 온도 및 압력 변화에 따라 상기 워크 임펠러로 유입되는 배기가스의 온도 및 압력이 일정하게 유지되도록 상기 메인 배기라인에 에어를 공급하는 제어용 에어 공급라인을 더 포함하는 것을 특징으로 하는 전기 아크로.The temperature and pressure of the exhaust gas flowing into the work impeller in connection with the main exhaust line between the work impeller and the exhaust port of the furnace body, and changes in the temperature and pressure of the exhaust gas discharged from the exhaust port of the furnace body An electric arc furnace further comprising a control air supply line for supplying air to the main exhaust line so that it is kept constant.
  6. 제 2 항에 있어서,The method of claim 2,
    상기 배기가스 재순환부는 The exhaust gas recirculation unit
    상기 순환 배기라인에 설치되고, 배기가스를 연소시켜 화학적 열에너지를 확보하기 위한 보조 버너를 더 포함하는 것을 특징으로 하는 전기 아크로.And an auxiliary burner installed in the circulating exhaust line and configured to secure chemical thermal energy by burning the exhaust gas.
  7. 제 2 항에 있어서,The method of claim 2,
    상기 메인 배기라인에 설치된 상기 워크 임펠러를 우회하는 바이패스 라인을 더 포함하는 것을 특징으로 하는 전기 아크로.And a bypass line bypassing the work impeller installed in the main exhaust line.
  8. 전기 아크로의 스크랩 예열 방법에 있어서:In the method of preheating scrap in an electric arc furnace:
    로 본체 내로 스크랩을 장입하여 용융하는 단계;Charging and melting scrap into the furnace body;
    상기 로 본체 내의 스크랩 용융 과정에서 발생되는 배기가스를 메인 배기라인을 통해 배기하는 단계; 및Exhausting the exhaust gas generated during the scrap melting process in the furnace body through a main exhaust line; And
    상기 메인 배기라인으로부터 배기되는 배기 가스의 일부를 상기 로 본체로 공급될 스크랩이 저장된 스크랩 예열 장입로로 재순환시켜 스크랩을 예열하는 단계를 포함하는 것을 특징으로 하는 전기 아크로의 스크랩 예열 방법.And preheating the scrap by recycling a portion of the exhaust gas exhausted from the main exhaust line to a scrap preheating charging furnace in which the scrap to be supplied to the furnace body is stored.
  9. 제 8 항에 있어서,The method of claim 8,
    상기 스크랩 예열 단계는The scrap preheating step
    상기 메인 배기라인에서 발생되는 흡입압력에 의해 회전되는 워크 임펠러로부터 동력을 전달받은 아이들링 임펠러가 회전하면서 상기 스크랩 예열 장입로로 재순환되는 배기가스의 순환기류를 제공하는 것을 특징으로 하는 전기 아크로의 스크랩 예열 방법.The preheating of the scrap of the electric arc furnace, characterized in that the idling impeller received power from the work impeller rotated by the suction pressure generated in the main exhaust line to provide a circulating air stream of the exhaust gas recycled to the scrap preheating charging path while rotating Way.
  10. 제 9 항에 있어서,The method of claim 9,
    상기 스크랩 예열 단계에서In the scrap preheating step
    상기 워크 임펠러로부터 상기 아이들링 임펠러로 전달되는 동력은 클러치에 의해 단속되는 것을 특징으로 하는 전기 아크로의 스크랩 예열 방법.And the power transmitted from the work impeller to the idling impeller is interrupted by a clutch.
  11. 제 8 항에 있어서,The method of claim 8,
    상기 스크랩 예열 단계는The scrap preheating step
    상기 스크랩 예열 장입로로 재순환되는 배기가스의 온도가 낮은 경우 배기가스를 연소시켜 화학적 열에너지를 확보하는 것을 특징으로 하는 전기 아크로의 스크랩 예열 방법.When the temperature of the exhaust gas recycled to the scrap preheating charging furnace is low, the waste preheating method of the electric arc furnace, characterized in that to ensure chemical thermal energy by burning the exhaust gas.
  12. 제 9 항에 있어서,The method of claim 9,
    상기 배기 단계는The evacuation step
    상기 로 본체로부터 방출되는 배기가스의 온도 및 압력이 낮은 경우 상기 워크 임펠러로 유입되는 배기가스의 온도 및 압력이 일정하게 유지되도록 상기 메인 배기라인에 에어를 추가 공급하는 것을 특징으로 하는 전기 아크로의 스크랩 예열 방법.When the temperature and pressure of the exhaust gas discharged from the furnace body is low, scrap of the electric arc furnace characterized in that the air is additionally supplied to the main exhaust line so that the temperature and pressure of the exhaust gas flowing into the work impeller is kept constant Preheating method.
  13. 제 9 항에 있어서,The method of claim 9,
    상기 전기 아크로의 스크랩 예열 방법은Scrap preheating method of the electric arc furnace
    상기 로 본체 내로 스크랩 추가 투입시 상기 스크랩 예열 장입로를 통한 배기가스 유출을 방지하도록 상기 아이들링 임펠러의 가동을 중지하여 상기 스크랩 예열 장입로의 내부 압력을 음압으로 만드는 것을 특징으로 하는 전기 아크로의 스크랩 예열 방법.Scrap preheating of the electric arc furnace characterized in that the internal pressure of the scrap preheating charge path is made negative by stopping the operation of the idling impeller so as to prevent the exhaust gas flow through the scrap preheating charge path when additional scrap is added into the furnace body. Way.
PCT/KR2015/002135 2014-03-07 2015-03-05 Electric arc furnace and method for preheating scrap in electric arc furnace WO2015133839A1 (en)

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