JP2515433B2 - Mounting structure of wall electrodes of DC arc furnace - Google Patents
Mounting structure of wall electrodes of DC arc furnaceInfo
- Publication number
- JP2515433B2 JP2515433B2 JP2400257A JP40025790A JP2515433B2 JP 2515433 B2 JP2515433 B2 JP 2515433B2 JP 2400257 A JP2400257 A JP 2400257A JP 40025790 A JP40025790 A JP 40025790A JP 2515433 B2 JP2515433 B2 JP 2515433B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- wall electrode
- furnace wall
- electrode
- gap
- 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 - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/06—Electrodes
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Discharge Heating (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Furnace Details (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、金属材料の溶解、溶融
金属の精錬等に使用される直流アーク炉の炉壁電極に関
するもので、特にその交換部の取付構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace wall electrode of a DC arc furnace used for melting a metal material, refining a molten metal, etc., and more particularly to a mounting structure for a replacement part thereof.
【0002】[0002]
【従来の技術】溶解、精錬用のアーク炉として、炉内に
装入した溶融金属の上方に配置した電極と、炉底、側壁
等の炉壁に取り付けられた電極との間に電流を流し、金
属材料の溶解、溶融金属の精錬等を行う直流アーク炉が
知られている。この種の直流アーク炉における炉壁電極
は、炉内にある高温の溶融金属からの受熱、供給電流が
通過するときに発生するジュール熱等によって、極めて
過酷な使用雰囲気に晒される。そこで、この雰囲気に耐
え、炉壁電極の耐久性を向上させるため、各種の提案が
行われているが、いずれにしろ炉壁電極は炉の操業の進
行に伴って損耗していき、炉壁電極の取替えを余儀無く
される。2. Description of the Related Art As an arc furnace for melting and refining, an electric current is passed between an electrode arranged above a molten metal charged in the furnace and an electrode attached to a furnace wall such as a furnace bottom or a side wall. A DC arc furnace for melting metal materials and refining molten metal is known. The furnace wall electrode in this type of DC arc furnace is exposed to an extremely harsh atmosphere due to heat received from the high-temperature molten metal in the furnace, Joule heat generated when a supply current passes through, and the like. Therefore, various proposals have been made to withstand this atmosphere and improve the durability of the furnace wall electrode, but in any case, the furnace wall electrode is worn out as the furnace operation progresses, and The electrodes have to be replaced.
【0003】この炉壁電極の取替え構造について、炉壁
電極部を底板を介して立設された陽極ピンと該陽極ピン
周囲に充填する耐火性組成物とを一体成形してカセット
方式とし、炉壁電極の取替え時に、この炉壁電極毎に取
り替えるようにすることによって、従来炉内作業という
劣悪な作業であったスタンプ施工等の電極部の修理、交
換を容易に行う構造が特開平01−128392号公報
に開示されているが、これには次の課題がある。In this furnace wall electrode replacement structure, an anode pin in which the furnace wall electrode portion is erected via a bottom plate and a refractory composition to be filled around the anode pin are integrally molded to form a cassette type furnace wall. When the electrodes are replaced, it is possible to easily repair and replace the electrode portion such as stamping, which was a poor work in the conventional furnace by replacing the electrodes for each furnace wall electrode. However, this has the following problems.
【0004】[0004]
【発明が解決しようとする課題】陽極(SS材)の周
辺は工場で施工できるが、鋼板枠体の周辺は、いわゆる
現場施工でスタンプするため、炉を冷却しなければなら
ず、時間的損失、熱的損失、冷却による補修部以外の炉
材のクラック等による損失を生じる。或いは、これら
の損失・損耗を抑えるには炉を冷却せず施工することが
要求されるが、この方法では、鋼板枠体の周辺の耐火物
を炉内からの作業で施工する必要が有るので、高熱部で
の作業となる。現場施工でのスタンプは、上記のよう
な作業環境であるので、その施工の品質は十分なもので
はなく、スタンプ材の亀裂、剥離が発生し、炉壁電極周
囲の耐火物の損耗が早くなり、その取替え頻度が多くな
り、電気炉の生産性が減少することになる。Although the periphery of the anode (SS material) can be constructed in the factory, the periphery of the steel plate frame is stamped by so-called on-site construction, and therefore the furnace must be cooled, resulting in time loss. , Thermal loss, and loss due to cracks in the furnace material other than the repaired part due to cooling. Alternatively, in order to suppress these losses and wear, it is required to carry out the construction without cooling the furnace, but with this method, it is necessary to construct the refractory around the steel plate frame by working from inside the furnace. , Work in the high heat section. Since the stamps used on-site are in the working environment as described above, the quality of their construction is not sufficient, cracks and peeling of the stamp material occur, and the wear of the refractory around the furnace wall electrode becomes faster. However, the frequency of replacement will increase and the productivity of the electric furnace will decrease.
【0005】従来の方法である特開平01−12839
2号公報によると、電極ブロックを下の方向に取り外し
たときに炉材充填層が崩れること、または新しい電極ブ
ロックを取り付けたときに電極ブロックと炉材充填層と
の間に製作誤差などにより、必然的に隙間が発生する。
この隙間が発生したままで操業を行った場合は、この隙
間への溶鋼の流入があり、さらに進んで溶鋼が炉底から
流出する。このためこの隙間が発生しないように、電極
ブロック周辺の炉材充填層は電極ブロックを取り付けた
後、現場で炉内からの作業で施工する必要がある。A conventional method is Japanese Patent Laid-Open No. 01-12839.
According to the publication No. 2, the furnace material filling layer collapses when the electrode block is removed downward, or when a new electrode block is attached, due to a manufacturing error between the electrode block and the furnace material filling layer, Inevitably gaps occur.
If the operation is carried out with this gap being generated, the molten steel will flow into this gap, and the molten steel will further flow out from the furnace bottom. Therefore, in order to prevent this gap from being generated, the furnace material filling layer around the electrode block needs to be installed on site by working from inside the furnace after the electrode block is attached.
【0006】本発明は上記課題を解決するためのもの
で、炉外からだけの作業で炉壁電極の取替えを可能に
し、炉を冷却する必要がなく、短時間に炉壁電極の取替
えが可能になると共に、取替え作業環境を高熱部より解
放することのできる直流アーク炉の炉壁電極の取付構造
を提供することを目的とする。The present invention is intended to solve the above-mentioned problems, and makes it possible to replace the furnace wall electrode only from the outside of the furnace, and it is not necessary to cool the furnace and the furnace wall electrode can be replaced in a short time. At the same time, it is an object of the present invention to provide a structure for attaching a furnace wall electrode of a DC arc furnace, which can release the replacement work environment from the high heat section.
【0007】[0007]
【課題を解決するための手段】上記目的を達成するため
の本発明の直流アーク炉の炉壁電極の取付構造は、炉底
板を介して立設された導電性ピン又はビレットの周囲
に、耐火物を充填し、側面がテーパー状に一体成形され
た直流アーク炉の炉壁電極を直流アーク炉の炉床に開孔
された炉壁電極の取付孔に取付自在とした直流アーク炉
の炉壁電極の取付構造において、前記炉壁電極の側面と
炉壁電極の取付孔との間に隙間を設け、該隙間に炉外か
ら耐火物の圧入が可能なノズルを設けたことを特徴とす
る。Means for Solving the Problems A furnace wall electrode mounting structure for a DC arc furnace according to the present invention for achieving the above object is provided with a fireproof structure around a conductive pin or billet erected via a furnace bottom plate. The wall of the DC arc furnace, which is filled with material and whose side wall is integrally formed into a taper shape, can be freely attached to the attachment hole of the electrode, which is opened in the hearth of the DC arc furnace. In the electrode mounting structure, a gap is provided between a side surface of the furnace wall electrode and a mounting hole of the furnace wall electrode, and a nozzle capable of press-fitting a refractory material from outside the furnace is provided in the gap.
【0008】このように炉壁電極の側面と炉壁電極の取
付孔との間に隙間を設け、該隙間に炉外から耐火物の圧
入が可能なノズルを設けたことにより、炉壁電極の取替
え後前記隙間に炉外からの耐火物の圧入が可能であり、
全ての炉壁電極取替作業が炉外から実施可能となる。As described above, the gap is provided between the side surface of the furnace wall electrode and the attachment hole of the furnace wall electrode, and the nozzle capable of press-fitting the refractory from the outside of the furnace is provided in the gap, whereby the furnace wall electrode After replacement, it is possible to press-in the refractory from the outside of the furnace,
All furnace wall electrode replacement work can be performed from outside the furnace.
【0009】[0009]
【実施例】図1は本発明の炉壁電極の取付構造断面図、
図2は本発明の炉壁電極の取付構造部の詳細図を示す。
直流アーク炉の炉壁電極2は、図1に示すように、炉床
1に形成した取付孔16に側面がテーパー状の炉壁電極
2が取り付けられ、この炉壁電極2は導電性のピンまた
はビレット3と耐火物4とを施工するための鋼板枠体9
を炉底板5に取り付けた構造よりなっている。この炉壁
電極2は電気炉本体の炉体金物6から突出した取付けフ
ランジ7に絶縁物8を介して取り付けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of a furnace wall electrode mounting structure of the present invention.
FIG. 2 shows a detailed view of the attachment structure of the furnace wall electrode of the present invention.
As shown in FIG. 1, a furnace wall electrode 2 of a DC arc furnace has a furnace wall electrode 2 having a tapered side surface attached to a mounting hole 16 formed in a hearth 1, and the furnace wall electrode 2 has a conductive pin. Alternatively, a steel plate frame 9 for constructing the billet 3 and the refractory 4
Is attached to the furnace bottom plate 5. The furnace wall electrode 2 is attached to a mounting flange 7 protruding from a furnace metal member 6 of an electric furnace body via an insulator 8.
【0010】図2はこの部位の取付構造部の詳細を示す
もので、炉体金物6から突出した取付けフランジ7に、
炉壁電極2は炉の外側から取付けボルト11により固設
される。炉体金物6と炉壁電極2とは電気的な絶縁を必
要とするので、それぞれ必要な部位にフランジ間絶縁物
8、フランジ内面絶縁物10、取付けボルト用絶縁物1
2を設置する。FIG. 2 shows the details of the mounting structure of this portion, in which the mounting flange 7 protruding from the furnace metal fitting 6 is
The furnace wall electrode 2 is fixed by a mounting bolt 11 from the outside of the furnace. Since the furnace body metal 6 and the furnace wall electrode 2 require electrical insulation, the inter-flange insulator 8, the flange inner surface insulator 10 and the mounting bolt insulator 1 are respectively provided at necessary portions.
Install 2.
【0011】炉壁電極2を炉体金物6に取り付けた状態
では、炉床1の取外し面15と鋼板枠体9との間には、
隙間14が発生する。この隙間14へは炉の外側の円周
数箇所に設けたノズル13から、耐火物が圧入され、こ
の隙間14が充填される。前記隙間の量は10〜50mm
程度が望ましい。10mmより小さくなると圧入材が均一
に充填されず、また余り大きくなると不経済であるの
で、上限は50mmとした。また、この範囲あれば炉壁電
極の製作誤差を吸収する事ができる。さらに、前記隙間
への圧入材の充填をより確実に行うためには、炉壁電極
の取替え時の取付け面15の補修時に、上部の隙間、即
ち図2のa部が極力小さくなるように補修を行えばよ
い。In the state where the furnace wall electrode 2 is attached to the furnace body metal piece 6, between the removal surface 15 of the furnace floor 1 and the steel plate frame body 9,
A gap 14 is generated. Refractory is press-fitted into the gap 14 from nozzles 13 provided at several circumferential positions outside the furnace, and the gap 14 is filled. The amount of the gap is 10 to 50 mm
The degree is desirable. If it is less than 10 mm, the press-fitting material is not uniformly filled, and if it is too large, it is uneconomical, so the upper limit was made 50 mm. Further, within this range, a manufacturing error of the furnace wall electrode can be absorbed. Further, in order to more reliably fill the press-fitting material into the gap, at the time of repairing the mounting surface 15 when replacing the furnace wall electrode, the upper gap, that is, part a in FIG. 2 is repaired as much as possible. Should be done.
【0012】このように炉壁電極2を、炉の外側から電
気炉本体の炉体金物6及び炉床1とにより構成される取
付孔16に取り付け、この取り付け時に炉床1の取外し
面15と鋼板枠体9との間に発生する隙間14に、炉の
外側から耐火物を圧入できるようにしたことで、炉壁電
極2の取替え作業の全てが、炉の外側から可能になっ
た。尚、前記鋼板枠体9は取替え用の炉壁電極の製作
時、耐火物の充填用ガイドであり、電気炉への炉壁電極
取替え時、取り付けなくてもよい。In this way, the furnace wall electrode 2 is attached from the outside of the furnace to the mounting hole 16 formed by the furnace body metal 6 of the electric furnace body and the hearth 1, and at the time of this mounting, the removal surface 15 of the hearth 1 By allowing the refractory material to be press-fitted from the outside of the furnace into the gap 14 generated between the steel plate frame body 9 and the furnace wall electrode 2, all the replacement work can be performed from the outside of the furnace. The steel plate frame 9 is a guide for filling the refractory when manufacturing the replacement furnace wall electrode, and may not be attached when replacing the furnace wall electrode in the electric furnace.
【0013】以上説明したように、本発明は全て炉外か
らだけの作業で炉壁電極の取替えを可能とし、炉を冷却
する必要がなく、炉壁電極の取替えも短時間に可能とな
り、取替え作業環境を高熱部より解放する事ができた。
しかも炉壁電極の取替え時間は従来の方法に比べ表1に
示す通り約1/3に短縮された。As described above, according to the present invention, it is possible to replace the furnace wall electrode only from the outside of the furnace, it is not necessary to cool the furnace, and the furnace wall electrode can be replaced in a short time. It was possible to release the working environment from the high heat section.
Moreover, as shown in Table 1, the replacement time of the furnace wall electrode was shortened to about 1/3 as compared with the conventional method.
【0014】[0014]
【表1】 [Table 1]
【0015】[0015]
【発明の効果】本発明の採用により炉壁電極の取替え
時、炉の冷却が必要でなくなったので、補修部位以外の
炉材のクラック等が少なくなり、また現場施工でのスタ
ンプ施工を省いたので、炉壁電極周囲の耐火物の損耗が
減少し、炉壁電極の寿命が向上することにより取替え頻
度の減少となり電気炉の生産性が向上した。EFFECTS OF THE INVENTION By adopting the present invention, it is not necessary to cool the furnace when replacing the furnace wall electrode, so that cracks and the like of the furnace material other than the repaired parts are reduced, and stamping on site construction is omitted. Therefore, the wear of the refractory around the furnace wall electrode is reduced, and the life of the furnace wall electrode is extended, so that the replacement frequency is reduced and the productivity of the electric furnace is improved.
【図1】本発明の炉壁電極の取付構造断面図FIG. 1 is a sectional view of a furnace wall electrode mounting structure of the present invention.
【図2】本発明の炉壁電極の取付構造部の詳細図FIG. 2 is a detailed view of the attachment structure of the furnace wall electrode of the present invention.
1 炉床 2 炉壁電極 3 導電性のピンまたはビレット 4 耐火物 5 炉底板 6 炉体金物 7 取付けフランジ 8 フランジ間絶縁物 9 鋼板枠体 10 フランジ内面絶縁物 11 取付けボルト 12 取付けボルト用絶縁物 13 ノズル 14 隙間 15 取外し面 16 炉壁電極の取付孔 1 Hearth 2 Furnace wall electrode 3 Conductive pin or billet 4 Refractory 5 Furnace bottom plate 6 Furnace metallurgy 7 Mounting flange 8 Insulator between flanges 9 Steel plate frame 10 Flange inner surface insulation 11 Mounting bolt 12 Insulation for mounting bolt 13 Nozzle 14 Gap 15 Removal Surface 16 Furnace Wall Electrode Mounting Hole
Claims (1)
はビレットの周囲に、耐火物を充填し、側面がテーパー
状に一体成形された直流アーク炉の炉壁電極を直流アー
ク炉の炉床に開孔された炉壁電極の取付孔に取付自在と
した直流アーク炉の炉壁電極の取付構造において、前記
炉壁電極の側面と炉壁電極の取付孔との間に隙間を設
け、該隙間に炉外から耐火物の圧入が可能なノズルを設
けたことを特徴とする直流アーク炉の炉壁電極の取付構
造。1. A furnace wall electrode of a DC arc furnace in which a refractory material is filled around a conductive pin or billet which is erected via a furnace bottom plate and whose side surfaces are integrally formed in a tapered shape is used for a DC arc furnace. In a furnace wall electrode mounting structure of a DC arc furnace which can be freely mounted in a furnace wall electrode mounting hole opened in the hearth, a gap is provided between the side surface of the furnace wall electrode and the furnace wall electrode mounting hole. A structure for mounting a furnace wall electrode of a DC arc furnace, characterized in that a nozzle into which a refractory material can be pressed from outside the furnace is provided in the gap.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2400257A JP2515433B2 (en) | 1990-12-03 | 1990-12-03 | Mounting structure of wall electrodes of DC arc furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2400257A JP2515433B2 (en) | 1990-12-03 | 1990-12-03 | Mounting structure of wall electrodes of DC arc furnace |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04214179A JPH04214179A (en) | 1992-08-05 |
JP2515433B2 true JP2515433B2 (en) | 1996-07-10 |
Family
ID=18510169
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2400257A Expired - Lifetime JP2515433B2 (en) | 1990-12-03 | 1990-12-03 | Mounting structure of wall electrodes of DC arc furnace |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2515433B2 (en) |
-
1990
- 1990-12-03 JP JP2400257A patent/JP2515433B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH04214179A (en) | 1992-08-05 |
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Legal Events
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Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19960305 |