JP3247781B2 - Operation method of electric furnace - Google Patents

Operation method of electric furnace

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Publication number
JP3247781B2
JP3247781B2 JP30898593A JP30898593A JP3247781B2 JP 3247781 B2 JP3247781 B2 JP 3247781B2 JP 30898593 A JP30898593 A JP 30898593A JP 30898593 A JP30898593 A JP 30898593A JP 3247781 B2 JP3247781 B2 JP 3247781B2
Authority
JP
Japan
Prior art keywords
slag
electric furnace
arc
furnace
measured
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.)
Expired - Fee Related
Application number
JP30898593A
Other languages
Japanese (ja)
Other versions
JPH07166222A (en
Inventor
清志 高橋
信元 高柴
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.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
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Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to JP30898593A priority Critical patent/JP3247781B2/en
Publication of JPH07166222A publication Critical patent/JPH07166222A/en
Application granted granted Critical
Publication of JP3247781B2 publication Critical patent/JP3247781B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • 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
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • C21C5/5217—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
    • 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
    • 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)
  • 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)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は、電気炉の操業方法に関
し、特にその精錬期、昇温期においてスラグをフォーミ
ング（ｆｏａｍｉｎｇ）させた後の高さ（以下、スラグ
フォーミング高さという）を常時制御して精錬反応の迅
速進行を図り、生産性の向上、各種原単位の低減を実現
させる技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating an electric furnace, and more particularly, to a method for constantly setting the height of slag after forming (slag forming) during the refining period and the heating period. TECHNICAL FIELD The present invention relates to a technique for controlling a refining reaction so as to rapidly progress, thereby improving productivity and reducing various basic units.

【０００２】[0002]

【従来の技術】電気炉を用いる鋼の精錬は、一般に、装
入原料の溶解期、精錬期（酸化期及び還元期）、昇温期
等の各段階を経て行われ、そこで起きる反応の主体は、
脱炭、脱燐、脱硫等を目的とするものである。ところ
で、脱燐は、精錬期においてＣａＯを主成分とした造滓
剤を鋼浴に投入し、酸素ガスを吹込み、 ２Ｐ ＋ ５Ｏ → Ｐ2 Ｏ5 の反応によって燐を酸化して、生成した五酸化燐を前記
造滓剤に吸収するものである。このスラグは、放置して
おくと逆方向の反応が進んで復燐が起きるので、速やか
に除去する方が良い。この問題に関しては、特開昭５８
−７３７１４号公報に、炭素粉末を不活性ガスをキャリ
ア・ガスとして溶鋼に吹込み、スラグ中に微細な気泡を
大量に生成させ、所謂スラグをフォーミングすることに
よって、速やかな排滓を実現することが開示されてい
る。その際、溶鋼上で盛り上がったスラグは、電気炉を
わずかに傾けるだけで排出容易になるだけでなく、電極
下方のアーク発生部分を包み、アークにより発生する熱
がほとんど外部に放射せず、電力原単位の低減が図れる
ことにも役立つ。2. Description of the Related Art Steel refining using an electric furnace is generally performed through various stages such as a melting period, a refining period (oxidation period and reduction period), and a heating period of a charged raw material, and a main component of a reaction occurring there. Is
It is intended for decarburization, dephosphorization, desulfurization, etc. Incidentally, dephosphorization is a slag agent mainly composed of CaO in refining stage was added to the steel bath, blowing an oxygen gas, by oxidizing phosphorus by reaction 2P + 5O → P 2 O 5 , it was produced The phosphorus pentoxide is absorbed by the slag-making agent. It is better to remove this slag promptly because the reaction in the opposite direction proceeds if left untreated and phosphorus reversion occurs. With respect to this problem,
Japanese Patent Application Publication No. 7-71414 discloses that carbon powder is blown into molten steel using an inert gas as a carrier gas to generate a large amount of fine bubbles in slag, and to form a so-called slag, thereby realizing rapid waste disposal. Is disclosed. At that time, the slag raised on the molten steel not only becomes easier to discharge by slightly tilting the electric furnace, but also wraps around the arc-generating part under the electrode, and the heat generated by the arc hardly radiates to the outside. It also helps to reduce the basic unit.

【０００３】また、脱硫に関しても、特開平１−２０５
０２２号公報に、スラグ中にＣａＣＯ3 粉体を不活性ガ
ス又は空気等を用いて吹込み、上記脱燐の場合と同様に
スラグフォーミングさせることの有効性が開示されてい
る。さらに、特開平２−１０７７１２号公報でも、アー
ク炉の電極近傍に、鉄粉と加炭剤を吹込み、スラグのフ
ォーミングを促進してアーク部分を覆い、電気炉の電力
原単位を低減させる方法が記載されている。Further, regarding desulfurization, Japanese Patent Laid-Open No.
No. 022 discloses the effectiveness of blowing CaCO 3 powder into slag using an inert gas or air, and performing slag forming in the same manner as in the above-described dephosphorization. Further, in Japanese Patent Application Laid-Open No. 2-107712, a method of injecting iron powder and a carburizing agent into the vicinity of an electrode of an arc furnace to promote slag forming to cover an arc portion and reduce electric power consumption of an electric furnace. Is described.

【０００４】しかしながら、現在の電気炉操業では、こ
のスラグフォーミング高さを操業中に管理する方法はオ
ペレータの目視によって行われており、その高さの判定
が曖昧で情報の瞬時性に欠けている。また、目視は、オ
ペレータが高温の炉内を観察する作業であり、安全上の
問題となっているばかりか、操業要員の省力、操業の自
動化の妨げになっている。さらには、上記スラグフォー
ミング高さの判定が曖昧なことに起因して、スラグフォ
ーミングを起こさせるためのカーボン粉末や酸素を、必
要以上に吹込んでそれらの原単位を上昇させ、操業コス
トが高くなるという問題を抱えている。However, in the current operation of the electric furnace, the method of managing the slag forming height during the operation is performed visually by an operator, and the determination of the height is ambiguous and lacks instantaneous information. . Visual observation is an operation in which the operator observes the inside of the furnace at a high temperature, which is not only a safety problem, but also hinders labor saving of operation personnel and automation of operation. Furthermore, due to the ambiguity in the determination of the slag forming height, carbon powder and oxygen for causing slag forming are blown more than necessary to raise their basic unit, thereby increasing operating costs. I have a problem.

【０００５】[0005]

【発明が解決しようとする課題】本発明は、かかる事情
を鑑みてなされたもので、電気炉で鋼を精錬するに際
し、スラグフォーミング高さをオンラインで自動的に測
定及び制御し、電気炉操業の生産性を向上し、合わせて
各種原単位を低減する方法の提供を目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and automatically measures and controls the slag forming height on-line when refining steel in an electric furnace. It is an object of the present invention to provide a method for improving the productivity of various types and reducing various basic units.

【０００６】[0006]

【課題を解決するための手段】発明者は、上記目的を達
成するため、スラグフォーミング高さを自動的に測定及
び制御することに関し、多くの実験、研究を繰り返し
た。本発明は、その結果に基づき完成させたものであ
り、鋼浴面上でスラグをフォーミングさせつつ鋼を精錬
する電気炉の操業において、上記電気炉の上方からスラ
グ表面までの距離を測定し、その測定したフォーミング
スラグ高さが設定したアーク長さの目標値と一致するよ
うに、酸素ガス吹込み速度及びカーボン又はアルミニュ
ウム粉末吹込み速度を自動的に調整してスラグで電極の
アークを覆って操業することを特徴とする電気炉の操業
方法である。また、本発明を具体的に実施するに関して
は、スラグ表面までの距離の測定をマイクロ波距離計で
行うことを特徴とする請求項１記載の電気炉の操業方法
である。In order to achieve the above object, the inventor repeated many experiments and studies on automatically measuring and controlling the slag forming height. The present invention has been completed based on the results, in the operation of an electric furnace for refining steel while forming slag on the steel bath surface, by measuring the distance from above the electric furnace to the slag surface, The measured forming
The oxygen gas blowing speed and the carbon or aluminum powder blowing speed are automatically adjusted so that the slag height matches the set arc length target value .
An operation method of an electric furnace, wherein the operation is performed by covering an arc . Further, the present invention relates to a method for operating an electric furnace according to claim 1, wherein the distance to the slag surface is measured by a microwave distance meter.

【０００７】この場合、電気炉としては、直流及び交流
のいずれのアーク炉を使用しても良い。[0007] In this case, any of a direct current and an alternating current arc furnace may be used as the electric furnace.

【０００８】[0008]

【作用】本発明では、電気炉内の鋼浴面上でスラグをフ
ォーミングさせつつ鋼を精錬する電気炉の操業におい
て、上記電気炉の上方からスラグ表面までの距離を測定
し、その測定値が目標スラグフォーミング高さと一致す
るように、酸素吹込み速度及びカーボン又はアルミニュ
ウム粉末吹込み速度を自動的に調整するようにしたの
で、スラグフォーミングは従来のオペレータの目視観察
に比して正確になり、またその高さも精度良く管理でき
るようになる。その結果、電極近傍でスラグが完全にア
ークを覆うようになり、アーク電圧の制御が良くなり、
またスラグの排出が早く、撹拌が良いことから精錬反応
時間の短縮も達成される。なお、スラグフォーミング高
さの測定器は、光や音波を利用した種々のものを適用で
きるが、トーピード・カーで溶銑を受ける際に実績のあ
るマイクロ波距離計の利用が好ましい。According to the present invention, in the operation of an electric furnace for refining steel while forming slag on the steel bath surface in the electric furnace, the distance from above the electric furnace to the slag surface is measured. Since the oxygen blowing speed and the carbon or aluminum powder blowing speed were automatically adjusted to match the target slag forming height, the slag forming became more accurate than the conventional operator's visual observation, Also, the height can be managed with high accuracy. As a result, the slag completely covers the arc near the electrode, and the control of the arc voltage is improved,
In addition, since the slag is discharged quickly and the stirring is good, the refining reaction time can be shortened. As a measuring device for the slag forming height, various devices using light or sound waves can be applied, but it is preferable to use a microwave distance meter that has a proven track record when receiving hot metal with a torpedo car.

【０００９】以下、図１に基づき本発明の内容を説明す
る。図１は、本発明を実施した電気炉３の縦断面図であ
る。まず、電気炉３の炉蓋２に、該炉蓋−スラグ表面間
距離ｌ1 を測定する距離センサ１を設置する。この距離
センサ１は、スラグ１４面に非接触式のもの、例えばマ
イクロ波距離計や超音波距離計が良いが、電気炉３操業
中の炉内雰囲気（温度、粉塵）の影響を受けないことを
重視すると、マイクロ波距離計が好ましい。次に、電気
炉３操業中のスラグ面高さｌ2 は、精錬期において上記
ｌ1 を常時測定すれば、操業当初に測定しておいた鋼浴
１８面までの距離を基準にしてデータ演算処理装置２１
で処理することによって容易に算出できる。本発明は、
この操業中に常時求められているスラグフォーミング高
さｌ1 を利用するものであり、具体的には以下のように
行われる。The contents of the present invention will be described below with reference to FIG. FIG. 1 is a longitudinal sectional view of an electric furnace 3 embodying the present invention. First, a distance sensor 1 for measuring a distance l 1 between the furnace lid and the slag surface is installed on the furnace lid 2 of the electric furnace 3. The distance sensor 1 is preferably a non-contact type on the surface of the slag 14, for example, a microwave range finder or an ultrasonic range finder, but is not affected by the furnace atmosphere (temperature, dust) during operation of the electric furnace 3. When emphasis is placed on the above, a microwave distance meter is preferable. Next, the slag level height l 2 of the electric furnace 3 during operation, if constantly measuring the l 1 in refining period, based on the distance to the steel bath 18 surface that has been measured initially operational data operation Processing unit 21
Can be easily calculated by performing the above processing. The present invention
Is intended to utilize the slag foaming height l 1 being asked constantly during this operation is specifically performed as follows.

【００１０】まず、フォーミングしたスラグ１４がアー
ク１９を覆っていない場合（すなわち、アーク１９長さ
がスラグフォーミング高さより大きい場合）について説
明する。ここで、アーク１９長さは、直流電気炉ではほ
ぼアーク電圧に対応する。例えば、アーク電圧４００Ｖ
の時、アーク長さは約４００ｍｍである。操業中にこの
ような状況になった場合には、実測されたフォーミング
スラグ高さが設定したアーク長さの目標値（後述）と一
致するように、カーボン粉末の添加量を増加してスラグ
のフォーミング高さを増加する。その目標値は、予め従
来の操業データからスラグフォーミング高さとカーボン
粉等の添加量の関係を求めておき、その関係から実際の
スラグ高さより若干低めが良いことが知られている。ま
た、カーボン粉等の添加は、データ演算処理器２１から
の信号で、カーボン粉等のホッパ開閉弁２２を自動的に
調整することによって容易に行われる。First, the case where the formed slag 14 does not cover the arc 19 (ie, the case where the length of the arc 19 is larger than the slag forming height) will be described. Here, the length of the arc 19 substantially corresponds to the arc voltage in a DC electric furnace. For example, arc voltage 400V
At this time, the arc length is about 400 mm. If such a situation occurs during operation, the amount of carbon powder added is increased and the slag is increased so that the measured forming slag height matches the target value of the set arc length (described later). Increase the forming height. As for the target value, it is known that the relationship between the slag forming height and the addition amount of carbon powder or the like is obtained in advance from conventional operation data, and it is slightly better than the actual slag height from the relationship. Further, the addition of carbon powder or the like can be easily performed by automatically adjusting the hopper opening / closing valve 22 for carbon powder or the like based on a signal from the data processing unit 21.

【００１１】一方、フォーミングしたスラグ１４がアー
ク１９を過剰に覆っている場合には、上記と逆にカーボ
ン粉等を減少あるいはアルミ灰添加の操作が行われ、適
量に覆われている場合には監視モニターの観察を続ける
だけで良い。なお、この場合、カーボン粉等を減少させ
る代わりに、アーク電圧を上げる操作が行われることも
ある。On the other hand, if the formed slag 14 covers the arc 19 excessively, on the contrary, the operation of reducing the carbon powder or the like or adding aluminum ash is performed. All you have to do is keep watching the monitor. In this case, an operation of increasing the arc voltage may be performed instead of reducing the carbon powder and the like.

【００１２】[0012]

【実施例】炉容量１００トン／チャージの直流アーク炉
（上部電極５を１本、炉底電極８を３本を備え、炉内径
が６７００ｍｍ，炉高さが３１００ｍｍである）を用い
て、普通鋼（ＳＤ，ＳＳ等）を精錬した。まず、比較例
であるが、炉内に装入したスクラップが溶け落ち精錬期
に入ったので、アーク電圧を４００Ｖへ下げた。それま
では酸素ガスの吹込み（流量１２０Ｎｍ3 ／ｍｉｎ以
下）のみを行っていたが、スラグフォーミングを目的と
してカーボン粉（粒径５ｍｍ以下）を吹込速度、約２０
０Ｋｇ／ｍｉｎで吹込んだ。オペレータが炉内観察を始
めたところ、すぐにスラグフォーミングが起きて電極５
先端が隠れた。その際、熱効率（溶鋼への着熱量／投入
電力）はもっとも良い状態になったが、本発明を適用し
ていないので、この状態は永く続かず、時にはアーク１
９が大幅に露出する。それを修正しようと、カーボン粉
を増量して吹込むと、スラグのフォミング高さをオペレ
ータの目視に頼っているので、逆に過剰吹込みで、スラ
グ１４がフォーミングしすぎて炉外に溢れ出ることもあ
り、カーボン粉原単位や電力原単位の上昇を招き、また
昇温材であるアルミ灰の原単位も増える結果となった。EXAMPLE A DC arc furnace having a furnace capacity of 100 tons / charge (provided with one upper electrode 5 and three furnace bottom electrodes 8, having a furnace inner diameter of 6700 mm and a furnace height of 3100 mm) is usually used. Steel (SD, SS, etc.) was refined. First, as a comparative example, since the scrap charged in the furnace melted and the refining period was started, the arc voltage was reduced to 400V. Until then, only oxygen gas was blown (flow rate 120 Nm 3 / min or less), but carbon powder (particle diameter 5 mm or less) was blown at a speed of about 20 for the purpose of slag forming.
Blowing was performed at 0 kg / min. When the operator started observing the inside of the furnace, slag forming occurred immediately and the electrode 5
The tip is hidden. At that time, the thermal efficiency (the amount of heat applied to the molten steel / input power) was in the best state, but since the present invention was not applied, this state did not continue for a long time, and sometimes the arc 1
9 is greatly exposed. In order to correct this, if the amount of carbon powder is increased and blown in, the slag forming height depends on the visual observation of the operator. Conversely, excessive blowing causes the slag 14 to form too much and overflow the furnace. In some cases, the unit consumption of carbon powder and the unit consumption of electric power increased, and the unit consumption of aluminum ash, which is a heating material, also increased.

【００１３】次に、操業条件は上記と同じにして別のチ
ャージの精錬を行い、スラグフォーミングに本発明に係
る操業方法を実施した。その際、スラグフォーミング高
さが設定した目標値以上になった場合は、カ−ボン粉に
替えアルミ灰を吹込み、フォーミングを鎮静させる方向
の処置を施した。その結果を表１に示すが、比較例に比
較して、カーボン粉、アルミ灰の原単位が約１５％、精
錬中の電力原単位が約１０％低減でき、脱炭、脱燐、脱
硫も目標通り行われて、円滑な操業が達成できた。Next, the refining of another charge was performed under the same operating conditions as described above, and the operating method according to the present invention was carried out for slag forming. At that time, when the slag forming height became equal to or more than the set target value, aluminum ash was blown in place of carbon powder to take measures in a direction to calm the forming. The results are shown in Table 1. Compared with the comparative example, the unit consumption of carbon powder and aluminum ash can be reduced by about 15%, the power consumption during refining can be reduced by about 10%, and decarburization, dephosphorization and desulfurization are also reduced. The operation was performed as planned, and smooth operation was achieved.

【００１４】[0014]

【表１】 （従来法の成績を１とした指数で表示） ──────────────────────────────────── 評価指数 従来法の成績 本発明の成績 カーボン粉原単位 １ ０．８５ Ａｌ灰原単位 １ ０．８５ 精錬期中の電力原単位 １ ０．９ ──────────────────────────────────── その後、本発明に係る操業方法を適用して数十チャージ
の操業が行われ、スラグフォーミング高さの設定値ｌsb
（ｍｍ）として下記式が確認された。[Table 1] (Displayed as an index with the result of the conventional method as 1) ───────────────────────────────── ─── Evaluation index Result of conventional method Result of the present invention Carbon powder basic unit 1 0.85 Al ash basic unit 1 0.85 Electric power basic unit during refining period 1 0.9 ─────────── ───────────────────────── After that, the operation method of the present invention is applied, and operation of several tens of charges is performed, and the slag forming height Set value l sb
The following formula was confirmed as (mm).

【００１５】ｌsb ＝ Ｅa − ５０ ここで、 Ｅa はアーク電圧（Ｖ）で，その時のアーク
長さ（ｍｍ）に対応する。なお、本式は、３００≦Ｅa
≦５００，カーボン粉の吹込速度が約２００Ｋｇ／ｍｉ
ｎ，アルミ灰の吹込速度が約１５０Ｋｇ／ｍｉｎの時に
有効であった。L sb = E a -50 where E a is the arc voltage (V) and corresponds to the arc length (mm) at that time. It should be noted that this formula is: 300 ≦ E a
≦ 500, the blowing speed of carbon powder is about 200Kg / mi
It was effective when the blowing speed of n and aluminum ash was about 150 kg / min.

【００１６】[0016]

【発明の効果】以上述べたように、本発明に係る電気炉
の操業方法を用いると、従来オペレータの目視観察に基
づいていたスラグフォーミング高さが、自動的にコント
ロールされるようになり、精錬期での投入電圧の適正
化、生産性の向上、電力や使用原材料の原単位低減が可
能となった。また、操業要員の省力も期待できる。As described above, when the method for operating an electric furnace according to the present invention is used, the slag forming height based on the visual observation of the operator is automatically controlled, and the refining is performed. In this period, it was possible to optimize the input voltage, improve productivity, and reduce the unit consumption of power and raw materials used. In addition, labor saving of operation personnel can be expected.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明に係る操業方法を実施した電気炉の設備
を示す図である。FIG. 1 is a diagram showing equipment of an electric furnace in which an operation method according to the present invention is performed.

【符号の説明】[Explanation of symbols]

１ マイクロ波距離計（センサ） ２ 炉蓋 ３ 電気炉本体 ４ スラグドア ５ 上部電極 ６ ５の昇降装
置 ７ 炉床耐火物 ８ 炉底電極 ９ 給電体 １０ トランス １１ サイリスタ １２ スラグ鍋 １３ 流出スラグ １４ フォーミン
グしたスラグ １５ カーボン粉等の吹込みパイプ １６ カーボン粉、アルミ灰ディスペンサ吹込みホッパ １７ 吹込み用ホース １８ 溶鋼 １９ アーク ２０ 排滓口 ２１ データ演算処理装置 ２２ ホッパ開閉
弁DESCRIPTION OF SYMBOLS 1 Microwave distance meter (sensor) 2 Furnace lid 3 Electric furnace main body 4 Slag door 5 Upper electrode 6 Elevating device of 5 7 Hearth refractory 8 Hearth bottom electrode 9 Feeder 10 Transformer 11 Thyristor 12 Slag pot 13 Outflow slag 14 Formed Slag 15 Blowing pipe for carbon powder, etc. 16 Carbon powder, aluminum ash dispenser blowing hopper 17 Blowing hose 18 Molten steel 19 Arc 20 Drain outlet 21 Data processing unit 22 Hopper open / close valve

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C21C 5/52 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) C21C 5/52

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 鋼浴面上でスラグをフォーミングさせつ
つ鋼を精錬する電気炉の操業において、 上記電気炉の上方からスラグ表面までの距離を測定し、
その測定したフォーミングスラグ高さが設定したアーク
長さの目標値と一致するように、酸素ガス吹込み速度及
びカーボン又はアルミニュウム粉末吹込み速度を自動的
に調整してスラグで電極のアークを覆って操業すること
を特徴とする電気炉の操業方法。In an operation of an electric furnace for refining steel while forming slag on a steel bath surface, a distance from above the electric furnace to a slag surface is measured,
Arc measured by the measured forming slag height
Operation of an electric furnace characterized by automatically adjusting the oxygen gas injection speed and the carbon or aluminum powder injection speed so as to match the target value of the length, and operating by covering the electrode arc with slag. Method. 【請求項２】 スラグ表面までの距離の測定をマイクロ
波距離計で行うことを特徴とする請求項１記載の電気炉
の操業方法。2. The method for operating an electric furnace according to claim 1, wherein the distance to the slag surface is measured by a microwave distance meter.
JP30898593A 1993-12-09 1993-12-09 Operation method of electric furnace Expired - Fee Related JP3247781B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30898593A JP3247781B2 (en) 1993-12-09 1993-12-09 Operation method of electric furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30898593A JP3247781B2 (en) 1993-12-09 1993-12-09 Operation method of electric furnace

Publications (2)

Publication Number Publication Date
JPH07166222A JPH07166222A (en) 1995-06-27
JP3247781B2 true JP3247781B2 (en) 2002-01-21

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Country Link
JP (1) JP3247781B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1006201A4 (en) * 1997-02-19 2005-07-27 Jfe Steel Corp Method of judging slag forming state in electric furnace steel production and method of operating electric furnace
CN1178554C (en) * 2000-03-17 2004-12-01 密执安特种矿石公司 Process and apparatus for automatically controlling slag foaming
ITMI20050539A1 (en) 2005-04-01 2006-10-02 Techint Spa METHOD AND APPARATUS FOR THE RECOVERY OF REFRACTORY MATERIALS OF RESULTS AND SORRIES FROM SIVIERA AS PROCESS SCORES IN STEEL PRODUCTION IN EAF AND ITS RELATED DOSAGE FOR THE FORMATION OF PROCESS SCORIA
ITUD20070075A1 (en) 2007-04-26 2008-10-27 Danieli Automation Spa PROCEDURE FOR CONTROL OF THE FEEDING OF THE METAL CHARGING FOR ARC ARC ELECTRIC OVENS
JP5068116B2 (en) * 2007-08-06 2012-11-07 株式会社神戸製鋼所 Slag forming control method for continuous melting furnace
DE102008045054A1 (en) 2008-08-26 2010-03-04 Sms Siemag Aktiengesellschaft Process for the foaming slag control of a stainless melt in an electric arc furnace
WO2011134052A1 (en) * 2010-04-26 2011-11-03 Hatch Ltd. Measurement of charge bank level in a metallurgical furnace
CN104630412B (en) * 2015-03-13 2016-09-07 响水恒生不锈钢铸造有限公司 A kind of molten iron straight stove of blowing

Also Published As

Publication number Publication date
JPH07166222A (en) 1995-06-27

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