WO2020096157A1 - Dispositif de commande de la position finale d'une lance à oxygène dans un four électrique - Google Patents

Dispositif de commande de la position finale d'une lance à oxygène dans un four électrique Download PDF

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Publication number
WO2020096157A1
WO2020096157A1 PCT/KR2019/007701 KR2019007701W WO2020096157A1 WO 2020096157 A1 WO2020096157 A1 WO 2020096157A1 KR 2019007701 W KR2019007701 W KR 2019007701W WO 2020096157 A1 WO2020096157 A1 WO 2020096157A1
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WO
WIPO (PCT)
Prior art keywords
oxygen lance
section
pressure
lance
oxygen
Prior art date
Application number
PCT/KR2019/007701
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English (en)
Korean (ko)
Inventor
이왕하
박정혁
심정연
Original Assignee
에이블맥스(주)
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 에이블맥스(주) filed Critical 에이블맥스(주)
Publication of WO2020096157A1 publication Critical patent/WO2020096157A1/fr

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Classifications

    • 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
    • F27B3/22—Arrangements of air or gas supply devices
    • F27B3/225—Oxygen blowing
    • 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
    • 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
    • F27B3/22—Arrangements of air or gas supply devices
    • 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
    • F27B3/28—Arrangement of controlling, monitoring, alarm or the like devices
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • 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
    • C21C2005/5288—Measuring or sampling devices
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/168—Introducing a fluid jet or current into the charge through a lance
    • 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 oxygen lance positioning device in an electric furnace operation, and in particular, it is possible to recognize the position of the end of the oxygen lance according to the pressure value measured through the pressure sensor, so that it is possible to accurately check the position and measure in real time. It relates to a position control device at the end of the oxygen lance in an electric furnace capable of position control using a pressure value.
  • the electric furnace 10 melts and refines the raw material by arc heat generated between the electrode and the iron scrap by passing an electric current through the electrode rod 11 to manufacture steel.
  • oxygen is supplied to the molten steel through the oxygen lance. If the distance between the end of the oxygen lance and the molten steel (I) is too close, the melting of the molten steel by the oxygen jet occurs and the stirring of the molten steel increases, but the decarbonization reaction There is a problem of increased peroxidation, and on the contrary, when the distance between the end of the oxygen lance and the molten steel increases, the amount of oxygen injected into the molten steel decreases, resulting in a decrease in efficiency and a decrease in stirring effect and decarburization effect of the molten steel.
  • the object of the present invention is to recognize the position of the end of the oxygen lance according to the pressure value measured through the pressure sensor, as well as to accurately check the position, and in the electric furnace capable of position control using the measured pressure value in real time. It is to provide a position control device at the end of the oxygen lance.
  • another object of the present invention is to provide a position control device for an oxygen lance end in an electric furnace in which a control unit receives a measured pressure value in real time and can automatically control the oxygen lance end to be located in a set working position section. .
  • the above object is, according to an embodiment of the present invention, an oxygen lance;
  • a lance driving unit that drives the oxygen lance up and down so that the end of the oxygen lance faces the molten steel;
  • a pressure sensor for measuring the pressure of oxygen discharged through the oxygen lance;
  • Output unit for outputting the pressure value measured by the pressure sensor; including, the end of the oxygen lance passing through the atmosphere, slag and molten steel, the oxygen lance based on the change in the pressure value appearing at each interface according to the medium It is achieved by the position control device of the end of the oxygen lance in the electric furnace for checking the position of the end and driving the oxygen lance through the lance driving unit.
  • the control unit stores the pressure value corresponding to each section by setting the section in which the pressure value increases rapidly to the molten steel section, and the control unit further includes the pressure so that the end of the oxygen lance is located in a preset working position section.
  • the lance driving unit may be controlled based on the pressure value measured by the sensor.
  • the working position section may be set to either the molten steel section, the boundary section between the slag and the molten steel, or the slag section adjacent to the boundary section of the slag and the molten steel.
  • the control unit sets the pressure value corresponding to the slag scattering position adjacent to the reference pressure inside the slag section as the scattering pressure, and when the pressure value measured by the pressure sensor during the electric furnace falls below the scattering pressure, It can be displayed through the alarm unit.
  • the pressure sensor may measure the resistance pressure to the discharge pressure of oxygen discharged through the oxygen lance.
  • the oxygen lance A lance driving unit that drives the oxygen lance up and down so that the end of the oxygen lance faces the molten steel;
  • a pressure sensor for measuring the pressure of oxygen discharged through the oxygen lance; In the atmosphere, the pressure value measured by the pressure sensor is used as a reference pressure, and a section in which the pressure value increases while the end of the oxygen lance enters the slag section, the pressure while entering the molten steel from the slag section includes a control section for storing the pressure value corresponding to each section by setting the section where the value rises rapidly to the molten steel section, wherein the control section measures at the pressure sensor so that the end of the oxygen lance is located in a preset working position section. It is also achieved by the position control device at the end of the oxygen lance in the electric furnace for controlling the lance driving unit based on the pressure value.
  • the position control device for the end of the oxygen lance in the electric furnace it is possible to recognize the position of the end of the oxygen lance according to the pressure value measured through the pressure sensor, as well as to accurately check the position, as well as the measurement pressure in real time There is an advantage that position control is possible using a value.
  • the position control device of the oxygen lance end in the electric furnace according to the present invention has the advantage that the control unit can receive the measured pressure value in real time and automatically control the oxygen lance end to be located in the set working position section.
  • FIG. 1 is a conceptual diagram of a method for locating the end of an oxygen lance in a conventional electric furnace operation
  • FIG. 2 is a block diagram of a position control device at the end of an oxygen lance in an electric furnace according to an embodiment of the present invention
  • FIG 3 is a graph of measured pressure values in a pressure sensor according to an embodiment of the present invention.
  • the position control device for the end of the oxygen lance includes an oxygen lance 13, a lance driving part 20, a pressure sensor 30, and an output part 40.
  • the oxygen lance 13 supplies oxygen into the electric furnace through a separate oxygen supply unit (not shown).
  • the lance driving unit 20 drives up and down the end of the oxygen lance 13 toward the molten steel I.
  • the lance driving unit 20 drives the oxygen lance 13 up and down or left and right while driving the end 131 of the oxygen lance 13 to be located at a desired position.
  • the pressure sensor 30 measures the pressure of oxygen discharged through the oxygen lance 13.
  • the pressure sensor 30 can measure various pressure values, for example, can measure the discharge pressure of oxygen discharged through the oxygen lance 13, and the resistance pressure (or negative pressure) to the discharge pressure of oxygen. ) Can be measured.
  • the resistance pressure varies depending on the density of the medium from which oxygen is discharged. For example, referring to FIG. 3, in the case of the atmosphere A, there is almost no resistance pressure, and the oxygen lance 13 When the end enters the slag (S), the pressure value gradually increases, and when it enters the molten steel (I), the pressure value becomes maximum.
  • the pressure value changes when entering the slag (S) in the atmosphere (A), or entering the molten steel (I) in the slag (S) It can be seen that it rises rapidly, and through this, it is possible to determine where the oxygen lance 13 is positioned.
  • Figure 3 shows the pressure value actually measured in the actual electric furnace process, shows a pressure of about 0 bar in the atmosphere (A), and then starts to increase the pressure value while entering the slag (S), molten steel ( In I), it can be seen that it represents about 13 bar.
  • the specific pressure value may be changed according to the process conditions of each electric furnace, since the trend of the pressure value shows the same trend, the position of the end 131 of the oxygen lance 13 is changed through the change of the pressure value. Can be recognized.
  • the output unit 40 outputs the pressure value measured by the pressure sensor 30.
  • the output unit 40 may be provided in various types, each measurement value may be expressed as a numerical value, and the numerical value and the change trend of the pressure value may be graphically displayed as shown in FIG. 3.
  • the operator of the oxygen lance 13, the end of the oxygen lance 13 on the basis of the change in the pressure value appearing at each interface according to the medium while passing through the atmosphere (A), slag (S) and molten steel (I) It is possible to check the position and drive the oxygen lance 13 through the lance driving unit 20.
  • the control unit 50 sets the pressure value measured by the pressure sensor 30 in the atmosphere A as a reference pressure S1, and the pressure value is generated while the oxygen lance 13 ends enters the inside of the slag S.
  • the section in which the pressure value increases rapidly while entering the increasing section from the slag section S2 and the slag S to the molten steel I is set as the molten steel section S3 to store the corresponding pressure value in each section.
  • control unit 50 starts to measure the pressure value from the atmosphere A, and the portion where the pressure value starts to increase from the uniform pressure value (the reference pressure) is the starting point of the slag section S2. It is possible to set and automatically set the portion where the pressure value increases rapidly as the starting point of the molten steel section S3.
  • the operator may check the trend of the pressure value output to the output unit 40 and directly input the section value of each section through a separate input unit, or may modify and input the section value automatically set by the control unit 50. Yes, of course.
  • control unit 50 may control the lance driving unit 20 based on the pressure value measured by the pressure sensor 30 such that the end of the oxygen lance 13 is positioned in the preset working position section W.
  • the working position section W is a section in which an operator wants to position the end 131 of the oxygen lance 13 in the electric furnace process, and can be variously set according to the purpose and type of the electric furnace process.
  • the working position section W is specifically, a molten steel section S3, a boundary section of the slag S and molten steel I, or a slag close to a boundary section of the slag S and molten steel I. It may be set to any one of the sections (S2).
  • the setting of the working position section W can be performed in various ways, and the control section 50 automatically sets each section (large section, slag section and molten steel section) described above according to the measurement result of the pressure sensor 30. If possible, it can be automatically set to a certain range ratio according to the boundary value of each section. For example, when each section is automatically set as shown in FIG. 3, when the working position section W is set as the molten steel section S3, the measured pressure value is set to 14 bar or more (W1) or slag ( When setting the working position section as the boundary section between S) and molten steel (I), the measured pressure value is set to 12.5 ⁇ 13.5 bar (W2), or the slag section close to the boundary section between slag (S) and molten steel (I). When setting the working position section (W) with (S2), it can be set (W3) with 10 to 12.5 bar.
  • the above-described respective values are merely provided as examples, and may be changed differently according to each electric furnace process.
  • the setting of the working position section W may be set by direct input by an operator, and of course, the automatic setting may be modified by the control unit 50.
  • the control unit 50 continuously receives the measured pressure value from the pressure sensor 30, and when the current measurement value deviates from the set working position section W, the lance driving unit 20 The position of the oxygen lance 13 is controlled through. For example, when the working position section W is set to the molten steel section S3, when the measured current pressure value falls below 14 bar, the lance driving unit 20 is driven to lower the oxygen lance 13 (melting steel). Direction) to drive until the measured pressure value becomes 14 bar or more.
  • control unit 50 measures and stores the rotation value ⁇ of the oxygen lance 130 for each pressure value as well as the pressure value, and stores the lance driving unit 20 at a rotation angle corresponding to each pressure value. You can also control.
  • control unit 50 sets the pressure value corresponding to the slag scattering position adjacent to the reference pressure S1 inside the slag section S2 as the scattering pressure S4, and the pressure sensor 30 during the electric furnace operation When the measured pressure value falls below the scattering pressure (S4), it can be displayed through the alarm unit 60.
  • the display through the alarm unit 60 can be set to enable various methods, such as audible or visual methods, as well as the scattering pressure (S4), as well as alarms at various locations as needed.
  • various methods such as audible or visual methods, as well as the scattering pressure (S4), as well as alarms at various locations as needed.
  • the position control device for the end of the oxygen lance in the electric furnace it is possible to recognize the position of the end of the oxygen lance according to the pressure value measured through the pressure sensor, as well as to accurately check the position, as well as the measurement pressure in real time There is an advantage that position control is possible using a value.
  • the position control device of the oxygen lance end in the electric furnace according to the present invention has the advantage that the control unit can receive the measured pressure value in real time and automatically control the oxygen lance end to be located in the set working position section.
  • the position control device of the end of the oxygen lance may include an oxygen lance 13, a lance driving unit 20, a pressure sensor 30, and a control unit 50.
  • the pressure value measured by the pressure sensor 30 is not output through the output unit 40, unlike the above-described embodiment, the control unit 50 receives the pressure value and automatically receives the reference pressure S1. ), Set the slag section (S2) and the molten steel section (S3), automatically set the working position section (W) from this, and then drive the lance driving section 20 according to the real-time measured pressure value to automatically oxygen lance (13) It is to control the position of the end 131.
  • the above-described configuration of the present invention can be applied to various processes in which it is difficult to install a range finder in the upper part such as a resin, a pulp mill, as well as a molten metal field according to an electric furnace operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

La présente invention concerne un dispositif de commande de la position finale d'une lance à oxygène dans un four électrique et, plus précisément, comprenant : une lance à oxygène ; une partie d'entraînement de lance entraînée verticalement de telle sorte que l'extrémité de la lance à oxygène fait face à l'acier fondu ; un capteur de pression pour mesurer la pression d'oxygène évacuée à travers la lance à oxygène ; et une partie de sortie pour délivrer en sortie une valeur de pression obtenue par réalisation d'une mesure avec le capteur de pression, et ainsi la présente invention vérifie la position finale de la lance à oxygène sur la base du changement de valeur de pression, qui se produit à chaque limite selon le milieu à mesure que l'extrémité de la lance à oxygène passe à travers l'air, les scories et l'acier fondu, et entraîne la lance à oxygène au moyen de la partie d'entraînement de lance. Par conséquent, la position finale de la lance à oxygène peut être reconnue en fonction de la valeur de pression obtenue par réalisation d'une mesure avec le capteur de pression, et ainsi la position précise de celui-ci peut être vérifiée, et un contrôle de position en temps réel est permis à l'aide de la valeur de pression mesurée.
PCT/KR2019/007701 2018-11-07 2019-06-26 Dispositif de commande de la position finale d'une lance à oxygène dans un four électrique WO2020096157A1 (fr)

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Application Number Priority Date Filing Date Title
KR1020180135602A KR20200052553A (ko) 2018-11-07 2018-11-07 전기로에서 산소랜스 끝단의 위치제어장치
KR10-2018-0135602 2018-11-07

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH068455B2 (ja) * 1988-02-29 1994-02-02 日本鋼管株式会社 ランス挿入位置制御装置
JPH06192718A (ja) * 1992-12-24 1994-07-12 Nippon Steel Corp ランスを消耗させない酸素または酸素含有ガスの吹込み方法
JPH06235012A (ja) * 1993-02-09 1994-08-23 Kawasaki Steel Corp 気体吹精方法およびその装置
JPH0771885A (ja) * 1993-08-31 1995-03-17 Kawasaki Steel Corp ランスの浸漬深さ検出方法およびその装置
JP2928600B2 (ja) * 1990-07-06 1999-08-03 日本スピング株式会社 酸素吹精装置及び方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101499945B1 (ko) 2013-12-11 2015-03-06 동국제강주식회사 전기로 조업에서 산소랜스와 용강간 거리 제어방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH068455B2 (ja) * 1988-02-29 1994-02-02 日本鋼管株式会社 ランス挿入位置制御装置
JP2928600B2 (ja) * 1990-07-06 1999-08-03 日本スピング株式会社 酸素吹精装置及び方法
JPH06192718A (ja) * 1992-12-24 1994-07-12 Nippon Steel Corp ランスを消耗させない酸素または酸素含有ガスの吹込み方法
JPH06235012A (ja) * 1993-02-09 1994-08-23 Kawasaki Steel Corp 気体吹精方法およびその装置
JPH0771885A (ja) * 1993-08-31 1995-03-17 Kawasaki Steel Corp ランスの浸漬深さ検出方法およびその装置

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