JP2718093B2 - Electric furnace with tuyere - Google Patents
Electric furnace with tuyereInfo
- Publication number
- JP2718093B2 JP2718093B2 JP24647988A JP24647988A JP2718093B2 JP 2718093 B2 JP2718093 B2 JP 2718093B2 JP 24647988 A JP24647988 A JP 24647988A JP 24647988 A JP24647988 A JP 24647988A JP 2718093 B2 JP2718093 B2 JP 2718093B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- furnace
- gas injection
- injection nozzle
- electric furnace
- 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
Links
Classifications
-
- 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
- Manufacture Of Iron (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、アーク熱を利用した電気炉において、炉
床部に金属製の吐出細管を有するガス吹き込みノズルを
配設した底吹き羽口を有する電気炉に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electric furnace utilizing arc heat, in which a bottom blowing tuyere provided with a gas injection nozzle having a metal discharge thin tube on a hearth is provided. An electric furnace having the same.
［従来の技術］ 従来の電気炉においては、スクラップ等の原料の溶解
の促進および精錬時間の短縮を目的に、炉床部から不活
性ガスもしくは酸化性ガスを炉内に吹き込む提案がなさ
れている。例えば、 電気炉の炉床からコールドゾーンの溶鋼内に各種のガ
スを吹き込む技術 （特開昭57−161021号公報）、 炉床部の鋼浴深さが1/2以下に当たる炉床に、電極の
下を避け、炉内の上方に向けて同心円上に多数のガス吹
き込みノズルを設け、前記ガス吹き込みノズルから鋼浴
中に溶解期は酸素を、そして精錬期には不活性ガスを吹
き込む技術 （特開昭60−103109号公報）、 が知られている。[Prior Art] In a conventional electric furnace, it has been proposed to blow an inert gas or an oxidizing gas into a furnace from a furnace floor for the purpose of accelerating the dissolution of raw materials such as scrap and shortening the refining time. . For example, a technique for injecting various gases from the hearth of an electric furnace into molten steel in a cold zone (Japanese Patent Application Laid-Open No. 57-161021). A large number of gas injection nozzles are provided concentrically toward the upper part of the furnace, avoiding below the furnace, and oxygen is injected into the steel bath from the gas injection nozzles during the melting period, and inert gas is injected during the refining period ( JP-A-60-103109) is known.
しかしながら、前者の技術の場合は、温度の低いコー
ルドゾーンの鋼浴中にガスを吹き込むものであるから、
前記温度の低い鋼浴が炉内を移動するに過ぎず、期待す
るほど溶解および精錬の促進効果は得られない。また、
後者の技術は炉床にガス吹込みノズルが多数設けられて
いるのでガス吹き込みノズルから鋼浴が漏出する危険性
があり、そのシールが困難である上、ガス吹き込みノズ
ルおよび炉床部の損耗が激しく、そのため冷却機構が必
要になり、冷却によって炉の熱が奪われる等、多くの問
題があった。However, in the case of the former technique, gas is blown into a steel bath in a cold zone having a low temperature.
The low-temperature steel bath merely moves in the furnace, and the effect of promoting melting and refining cannot be obtained as expected. Also,
In the latter technique, since a large number of gas injection nozzles are provided on the hearth, there is a danger that the steel bath leaks from the gas injection nozzle, and it is difficult to seal the steel bath.In addition, the gas injection nozzle and the hearth are worn. Intensely, a cooling mechanism is required, and there are many problems, such as cooling taking off the heat of the furnace.
この問題点を解決するために提案された技術（特開昭
60−103109号公報）がある。次に、この従来技術につい
て図面を参照しながら説明する。The technology proposed to solve this problem (Japanese Patent Laid-Open
No. 60-103109). Next, this prior art will be described with reference to the drawings.
第４図は従来技術の底吹き電気炉を示す概略平面断面
図、第５図は第４図の概略縦断面図である。図面に示す
ように炉壁２が耐火物でそして炉床３がMgOスタンプ材
でライニングされ、周囲は鉄皮４で覆われている電気炉
１には、３本の電極５が挿入され、アーク熱によって電
気炉１内に装入されたスクラップ等の溶解、精錬が行わ
れる。この時、電極５と対向する炉壁方向にホットゾー
ン６が生成し、各電極５の間の炉壁方向にコールドゾー
ン７が生成する。８は未溶解のスクラップ、９は出鋼
樋、10は炉壁に設けられた助燃用バーナ、11は溶鋼であ
る。そして、12はガス吹き込みノズルで、炉芯13と電極
５の中心を結ぶ直線上で電極５より炉壁側に配置されて
いる。また、ガス吹込みノズルは、スクラップの溶け落
ち後の鋼浴面のほぼ中央部Ａに収斂する方向に配設され
ている。このガス吹き込みノズル12の配置によって不活
性ガスを吹き込むと、溶解期においては、ホットゾーン
６にある溶融物が強く撹拌され、この撹拌によって、コ
ールドゾーン７に存在する未溶解のスクラップ８に、ホ
ットゾーン６にある溶融物が移動し、前記溶融物によっ
てスクラップ８の溶解が促進される。そして精錬期にお
いては、ホットゾーン６にある溶融物を鋼浴面のほぼ中
央部Ａに収斂するように移動させるので、溶鋼11の温度
偏差や成分の不均一性が減少する。FIG. 4 is a schematic plan sectional view showing a conventional bottom-blown electric furnace, and FIG. 5 is a schematic longitudinal sectional view of FIG. As shown in the drawing, three electrodes 5 are inserted into an electric furnace 1 in which a furnace wall 2 is made of a refractory and a hearth 3 is lined with a MgO stamp material, and the periphery thereof is covered with a steel shell 4. Melting and refining of scraps and the like charged in the electric furnace 1 are performed by heat. At this time, a hot zone 6 is generated in the direction of the furnace wall facing the electrode 5, and a cold zone 7 is generated in the direction of the furnace wall between the electrodes 5. Reference numeral 8 denotes unmelted scrap, 9 denotes a tapping gutter, 10 denotes a burner provided on the furnace wall for combustion, and 11 denotes molten steel. Reference numeral 12 denotes a gas injection nozzle, which is arranged on the furnace wall side of the electrode 5 on a straight line connecting the furnace core 13 and the center of the electrode 5. Further, the gas injection nozzle is disposed in a direction converging substantially at the central portion A of the steel bath surface after the scrap has melted down. When an inert gas is blown by the arrangement of the gas blowing nozzle 12, in the melting period, the molten material in the hot zone 6 is strongly stirred, and by this stirring, the unmelted scrap 8 existing in the cold zone 7 is hot melted. The melt in zone 6 moves, which promotes the dissolution of scrap 8. In the refining period, the molten material in the hot zone 6 is moved so as to converge to the substantially central portion A of the steel bath surface, so that the temperature deviation of the molten steel 11 and the non-uniformity of components are reduced.
［発明が解決しようとする課題］ しかしながらこの従来技術においては、 ガス吹き込みノズル12が炉芯13と電極５の中心を結ぶ
直線上で電極５より炉壁側に配置されている場合は、電
極５のアークはフレミングの左手の法則により炉壁側に
流れる。そして炉底部に金属製の吐出細管を有するガス
吹き込みノズル12を有する場合には、スクラップと金続
製（例えばSUSパイプ）の吐出細管を有するガス吹き込
みノズル12が接触すると、電極５からアークが飛びスク
ラップを経由してSUSパイプへ電流が流れるので、SUSパ
イプが溶融して溶損するという問題がある。[Problems to be Solved by the Invention] However, in this conventional technique, when the gas injection nozzle 12 is disposed on the furnace wall side of the electrode 5 on a straight line connecting the furnace core 13 and the center of the electrode 5, Arc flows toward the furnace wall according to Fleming's left-hand rule. When a gas injection nozzle 12 having a discharge tube made of metal is provided at the bottom of the furnace, when the scrap comes into contact with a gas injection nozzle 12 having a discharge tube made of metal (for example, SUS pipe), an arc jumps from the electrode 5. Since current flows to the SUS pipe via the scrap, there is a problem that the SUS pipe is melted and melted.
スクラップの溶け落ち後の鋼浴面のほぼ中央部Ａに収
斂する方向にガス吹き込みノズル12を配設し、金属製の
吐出細管を有するガス吹き込みノズル12から不活性ガス
を溶鋼11中に吹き込むと、電極直下の溶鋼11面が盛り上
がり、溶鋼11と電極５が接触して、電極５が異状溶損す
るという問題が発生していた。A gas injection nozzle 12 is disposed in a direction converging to a substantially central portion A of the steel bath surface after the scrap has melted down, and an inert gas is injected into the molten steel 11 from the gas injection nozzle 12 having a metal discharge thin tube. However, the surface of the molten steel 11 immediately below the electrode rises, and the molten steel 11 comes into contact with the electrode 5, causing a problem that the electrode 5 is abnormally damaged.
この発明はかかる事情に鑑みてなされたものであっ
て、金属製（例えばSUSパイプ）の吐出細管を有するガ
ス吹き込みノズル溶損の防止と電極の異状溶損を防止す
ることを目的とする。The present invention has been made in view of such circumstances, and has as its object to prevent the gas injection nozzle having a metal (for example, SUS pipe) discharge capillary from being damaged and the electrode from being abnormally damaged.
［課題を解決するための手段］ この発明は、スクラップ等の原料をアーク熱を利用し
て溶解・精錬する底吹き電気炉において、電極のピッチ
サークルから炉壁方向に200mm〜1000mmの範囲で、且つ
炉芯と電極の中心を結ぶ線から５゜〜25゜離れた範囲の
炉床部に、金属製の吐出細管を有するガス吹き込みノズ
ルを配設することを特徴とする。[Means for Solving the Problems] The present invention relates to a bottom-blown electric furnace for melting and refining raw materials such as scrap using arc heat, in a range of 200 mm to 1000 mm in the direction of the furnace wall from a pitch circle of electrodes. Further, a gas injection nozzle having a discharge tube made of metal is provided in a hearth portion in a range of 5 to 25 degrees away from a line connecting the center of the furnace core and the center of the electrode.
［作用］ この発明は、電極のピッチサークルから炉壁方向に20
0mm〜1000mmの範囲で、且つ電気炉の炉芯と電極の中心
を結ぶ線上から５゜〜25゜離れた位置の炉床部に、金属
製の吐出細管を有するガス吹き込みノズルを配置してお
り、電極とガス吹き込みノルズの金属製の吐出細管がず
れているので、電極から炉壁側に流れるアークがガス吹
き込みノズルの金属製の吐出細管に流れることはない。
ガス吹き込みノズルの配置位置を限定した理由は、電極
のピッチサークルより炉芯側になると溶鋼の湯暴れが大
きくなり、溶鋼と電極が接触して、電極の異常溶損が発
生する。電極のピッチサークルから炉壁方向に200mm未
満の場合はスクラップの溶解中に電極のアークがガス吹
き込みノズルの金属製の吐出細管に流れ、金属製の吐出
細管が溶損すること及び溶鋼中へのガスを吹き込み中は
溶鋼の湯面が盛り上がり電極が異常溶損する。電極のピ
ッチサークルから炉壁方向に1000mmを越えると溶鋼の撹
拌が弱くなる。又、ガス吹き込みノズルの配置位置が電
気炉の炉芯と電極の中心を結ぶ線上から５゜未満の範囲
である場合は、ガス吹き込みノズルの金属製の吐出細管
が電極直下近傍に位置するので、通電中のアークがガス
吹き込みノズルの金属製の吐出細管に流れる。ガス吹き
込みノズルの配置位置を電気炉の炉芯と電極の中心を結
ぶ線上から25゜を超えて離れている場合は、すぐ近くに
コールドゾーン（コールドゾーンはホットゾーンに比較
して溶鋼温度が低い）があるのでその付近の溶鋼の流動
性が悪く、この部分での溶鋼の撹拌が弱くなる。[Operation] The present invention relates to a method in which 20
A gas injection nozzle having a discharge tube made of metal is arranged in the furnace floor within a range of 0 mm to 1000 mm and at a distance of 5 to 25 mm from a line connecting the core of the electric furnace and the center of the electrode. Since the electrode and the gas discharge nose metal discharge capillary are displaced, the arc flowing from the electrode to the furnace wall side does not flow into the metal discharge capillary of the gas supply nozzle.
The reason why the arrangement position of the gas injection nozzle is limited is that when the molten steel runs farther from the core of the electrode than the pitch circle of the electrode, the molten steel becomes hot and the molten steel comes into contact with the electrode, and abnormal melting of the electrode occurs. If the distance from the electrode pitch circle to the furnace wall is less than 200 mm, the arc of the electrode flows into the metal discharge capillary of the gas injection nozzle during melting of the scrap, causing the metal discharge capillary to melt and the gas into the molten steel. During the injection, the molten steel surface rises and the electrode is abnormally damaged. If it exceeds 1000 mm from the electrode pitch circle toward the furnace wall, the stirring of molten steel becomes weak. Further, when the position of the gas injection nozzle is within a range of less than 5 ° from a line connecting the core of the electric furnace and the center of the electrode, since the metal discharge capillary of the gas injection nozzle is located immediately below the electrode, The energized arc flows through the metal discharge capillary of the gas blowing nozzle. If the gas injection nozzle is located more than 25 mm from the line connecting the core of the electric furnace and the center of the electrode, a cold zone (cold zone has a lower molten steel temperature than hot zone) ), The fluidity of the molten steel in the vicinity is poor, and the stirring of the molten steel in this portion is weak.
［実施例］ 以下添付図面を参照してこの本発明の一実施例につい
て説明する。Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.
第１図および第２図はこの発明の一実施例の電気炉を
示し、第１図は概略平面断面図、第２図は概略縦断面図
である。図面に示すように炉壁２が耐火物でそして炉床
３がMgOスタンプ材でライニングされ、周囲は鉄皮４で
覆われている電気炉１には、３本の電極５が定められた
ピッチサークル15で配置されている。９は出鋼樋であ
る。６は溶解・精錬時において電極５と対向する炉壁方
向に生成するホットゾーンであり、７は各電極５の間の
炉壁方向に生成するコールドゾーンを示し、８は未溶解
のスクラップを示す。1 and 2 show an electric furnace according to an embodiment of the present invention. FIG. 1 is a schematic plan sectional view, and FIG. 2 is a schematic longitudinal sectional view. As shown in the drawing, an electric furnace 1 in which a furnace wall 2 is made of a refractory and a hearth 3 is lined with a MgO stamp material, and the periphery of which is covered with a steel shell 4, is provided with three electrodes 5 having a predetermined pitch. They are arranged in a circle 15. 9 is a tapping gutter. Reference numeral 6 denotes a hot zone generated in the direction of the furnace wall facing the electrode 5 during melting and refining, 7 denotes a cold zone generated between the electrodes 5 in the direction of the furnace wall, and 8 denotes unmelted scrap. .
12はガス吹き込みノズルで、電極５より炉壁２方向外
側の炉床部に各電極５に対して各１基が配設されてい
る。ガス吹き込みノズル12は第３図に示す範囲に配置さ
れている。第３図は、この発明の電気炉の平面断面を表
し、ガス吹込みノズルの配置範囲を示した図である。第
３図において、２は炉壁、４は鉄皮、５は電極を示す。
ガス吹き込みノズルは、炉芯13と電極５の中心を結ぶ直
線14に対する角度が５゜の線16と直線14に対する角度が
20゜の線17との間で、且つ電極のピッチサークル15の半
径より200mm大きい半径を有する同心円18と1000mm大き
い半径を有する同心円19で囲まれた範囲Ｂ内に配置す
る。第１図の一実施例におけるガス吹き込みノズル12
は、１基は電極のピッチサークル15（炉芯13からの距離
が675mm）からの距離が300mmのところに、他の２基は60
0mmのところに配置されている。各ガス吹き込みノズル1
2は同一の同心円上にすべてを配置するよりも、異なる
同心円上に配置した方が撹拌効率が良い。Numeral 12 denotes a gas injection nozzle, one of which is provided for each electrode 5 on the hearth outside the electrode 5 in the furnace wall 2 direction. The gas blowing nozzle 12 is arranged in the range shown in FIG. FIG. 3 is a plan cross-sectional view of the electric furnace of the present invention, showing the arrangement range of the gas injection nozzle. In FIG. 3, 2 indicates a furnace wall, 4 indicates an iron shell, and 5 indicates an electrode.
The gas injection nozzle has an angle of 5 ° with respect to a straight line 14 connecting the furnace core 13 and the center of the electrode 5 and an angle with respect to the straight line 14 of 5 °.
It is arranged between a 20 ° line 17 and a range B surrounded by a concentric circle 18 having a radius 200 mm larger than the radius of the electrode pitch circle 15 and a concentric circle 19 having a radius larger than 1000 mm. Gas injection nozzle 12 in one embodiment of FIG.
Is one where the distance from the electrode pitch circle 15 (the distance from the furnace core 13 is 675 mm) is 300 mm, and the other two are 60 mm
It is located at 0mm. Each gas injection nozzle 1
The mixing efficiency of 2 is better when arranged on different concentric circles than when all are arranged on the same concentric circle.
なお、各ガス吹き込みノズル12は吹込みガス流量が独
立制御可能になっている。The gas blowing nozzles 12 can independently control the flow rate of the blowing gas.
ガス吹き込みノズル12は載頭円錐形状をしており、全
体の寸法は頭部側は、80mmФ、底部側は130mmФで、ガ
ス吹き込みノズル12の全体の長さは690mmである。ガス
吹き込みノズル12は材質がMgO−Ｃ材で多数の細管を有
する多孔ノズルである。ガス吹き込みノズル12内の細管
は、内径1mmФ、外径3mmФのステンレス製のパイプで、
23本が配設されている。The gas injection nozzle 12 has a frusto-conical shape, and the overall dimensions are 80 mmФ on the head side and 130 mmФ on the bottom side, and the entire length of the gas injection nozzle 12 is 690 mm. The gas injection nozzle 12 is a multi-hole nozzle made of MgO-C material and having a large number of small tubes. The thin tube inside the gas injection nozzle 12 is a stainless steel pipe with an inner diameter of 1 mmФ and an outer diameter of 3 mmФ.
23 are arranged.
このように構成された装置による溶解、精錬について
説明する。A description will be given of melting and refining by the apparatus configured as described above.
先ず、電気炉１内にスクラップ等の原料を装入すると
共に石灰と珪砂等のフラックスも装入する。そして電極
５に３相交流電圧を給電し、電極５とスクラップの間に
アークを形成して原材料等を溶解する。これと併行して
電気炉１の炉底に配置されているガス吹き込みノズル12
からアルゴンガスを吹き込む。原材料等が完全に溶解
後、装入扉（図示せず）から電気炉内に焼石灰、FSi等
を装入し、溶鋼を精錬する。アルゴンガスの吹き込み時
間は約100分間で、ガス吹き込みノズル12から１本当た
り20Nm3/mm吹き込む。First, a raw material such as scrap is charged into the electric furnace 1 and a flux such as lime and silica sand is also charged. Then, a three-phase AC voltage is supplied to the electrode 5, an arc is formed between the electrode 5 and the scrap, and the raw material and the like are dissolved. At the same time, the gas injection nozzle 12 arranged at the bottom of the electric furnace 1
Is blown with argon gas. After the raw materials, etc. are completely melted, calcined lime, FSi, etc. are charged into the electric furnace from a charging door (not shown) to refine the molten steel. The blowing time of the argon gas is about 100 minutes, and 20 Nm 3 / mm is blown from each of the gas blowing nozzles 12.
（実施例） 上記の操業条件によって溶解、精錬を行い、従来技術
との比較をした結果を第１表に示す。従来技術における
ガス吹込みノズルは炉芯と電極を結ぶ直線上に配置し
た。第１表において、従来技術では吐出細管を有するガ
ス吹き込みノズルのアークによる溶損、電極直下の溶鋼
の盛り上がりよる溶鋼と電極の接触による電極の異常溶
損、溶鋼の撹拌不足による製鋼時間（溶解時間＋精錬時
間）の延長が発生していたが、この本発明では、ガス吹
き込みノズルのアークによる溶損、電極の異常溶損がな
くなった。(Example) Table 1 shows the results of melting and refining under the above operating conditions, and comparing with the conventional technology. The gas injection nozzle in the prior art was arranged on a straight line connecting the furnace core and the electrode. As shown in Table 1, in the prior art, the gas injection nozzle having the discharge thin tube is damaged by the arc, the molten steel immediately below the electrode is in contact with the molten steel due to the swelling of the molten steel, and the electrode is abnormally damaged. (+ Refining time), but in the present invention, melting of the gas injection nozzle due to arc and abnormal melting of the electrode were eliminated.
また、製鋼時間（溶解時間＋精錬時間）も10％短縮さ
れた。The steelmaking time (melting time + refining time) was also reduced by 10%.
従来技術の製鋼時間を100として、この発明の製鋼時
間を比較した。 The steel making time of the present invention was compared with the steel making time of the prior art as 100.
［発明の効果］ この発明は、電極のピッチサークルから炉壁方向に20
0〜1000mm範囲で、且つ電気炉の炉芯と電極の中心を結
ぶ線から５゜〜25゜離れた範囲の炉床部に、金属製の吐
出細管を有するガス吹き込みノズルを配置しているの
で、ガス吹き込みノズルの溶損、電極の異常溶損がな
る。そして、さらに製鋼時間が短縮される。[Effects of the Invention] The present invention relates to a method in which 20
Since the gas injection nozzle having a metal discharge thin tube is arranged in the hearth within a range of 0 to 1000 mm and at a distance of 5 to 25 mm from a line connecting the furnace core of the electric furnace and the center of the electrode. In addition, erosion of the gas injection nozzle and abnormal erosion of the electrode occur. And the steelmaking time is further reduced.
第１図および第２図はこの発明の一実施例の電気炉を示
し、第１図は概略平面断面図、第２図は概略縦断面図、
第３図はこの発明の電気炉の平面断面を表し、ガス吸込
みノズルの配置範囲を示した図、第４図は従来技術の底
吹き電気炉を示す概略平面断面図、第５図は概略縦断面
図である。 １……電気炉、２……炉壁、３……炉床、５……電極、 ６……ホットゾーン、７……コールドゾーン、 12……ガス吹き込みノズル、13……炉芯、 14……炉芯と電極の中心と結ぶ直線、 15……電極のピッチサークル、 16……直線14に対する角度が５゜の線、 17……直線14に対する角度が25゜の線、 18……電極のピッチサークルの半径より200mm大きい半
径を有する同心円、 19……電極のピッチサークルの半径より1000mm大きい半
径を有する同心円。1 and 2 show an electric furnace according to an embodiment of the present invention. FIG. 1 is a schematic plan sectional view, FIG. 2 is a schematic longitudinal sectional view,
FIG. 3 shows a plane cross section of the electric furnace of the present invention, showing the arrangement range of the gas suction nozzle, FIG. 4 is a schematic plan sectional view showing a conventional bottom-blowing electric furnace, and FIG. FIG. 1 ... electric furnace, 2 ... furnace wall, 3 ... hearth, 5 ... electrode, 6 ... hot zone, 7 ... cold zone, 12 ... gas blowing nozzle, 13 ... furnace core, 14 ... ... a straight line connecting the furnace core and the center of the electrode, 15 ... a pitch circle of the electrode, 16 ... a line whose angle to the straight line 14 is 5 °, 17 ... a line whose angle to the straight line 14 is 25 °, 18 ... A concentric circle having a radius 200 mm larger than the radius of the pitch circle, 19 ... a concentric circle having a radius 1000 mm larger than the radius of the pitch circle of the electrode.
Claims (1)
溶解・精錬する底吹き電気炉において、電極のピッチサ
ークルから炉壁方向に200mm〜1000mmの範囲で、且つ炉
芯と電極の中心を結ぶ線から５゜〜25゜離れた範囲の炉
床部に、金属製の吐出細管を有するガス吹き込みノズル
を配設することを特徴とする底吹き羽口を有する電気
炉。1. A bottom-blown electric furnace for melting and refining raw materials such as scrap using arc heat, in a range of 200 mm to 1000 mm from a pitch circle of electrodes to a furnace wall direction, and a center of the furnace core and the electrodes. An electric furnace having a bottom-blowing tuyere, wherein a gas-blowing nozzle having a discharge tube made of metal is provided in a furnace floor at a distance of 5 to 25 degrees from a connecting line.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24647988A JP2718093B2 (en) | 1988-09-30 | 1988-09-30 | Electric furnace with tuyere |
| US07/329,675 US4913732A (en) | 1988-05-19 | 1989-03-28 | Method for smelting reduction in electric furnace |
| DE8989107022T DE68902176T2 (en) | 1988-05-19 | 1989-04-19 | METHOD FOR MELT REDUCTION IN THE ELECTRIC OVEN. |
| ES198989107022T ES2034464T3 (en) | 1988-05-19 | 1989-04-19 | METHOD FOR REDUCTION BY FUSION IN ELECTRIC OVEN. |
| EP89107022A EP0342374B1 (en) | 1988-05-19 | 1989-04-19 | Method for smelting reduction in electric furnace |
| CA000599975A CA1330103C (en) | 1988-05-19 | 1989-05-17 | Method for smelting reduction in electric furnace |
| KR1019890006598A KR910009960B1 (en) | 1988-05-19 | 1989-05-17 | Method for smelting reduction in electric furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24647988A JP2718093B2 (en) | 1988-09-30 | 1988-09-30 | Electric furnace with tuyere |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0293289A JPH0293289A (en) | 1990-04-04 |
| JP2718093B2 true JP2718093B2 (en) | 1998-02-25 |
Family
ID=17149009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24647988A Expired - Fee Related JP2718093B2 (en) | 1988-05-19 | 1988-09-30 | Electric furnace with tuyere |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2718093B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5166805B2 (en) * | 2007-09-19 | 2013-03-21 | 株式会社神戸製鋼所 | Method for producing molten iron by arc heating |
| JP6458531B2 (en) * | 2015-02-17 | 2019-01-30 | 新日鐵住金株式会社 | Stirring method in arc type bottom blowing electric furnace |
| CN112458236B (en) * | 2021-01-29 | 2021-04-30 | 北京科技大学 | Method for refining and deep desulfurization of molten steel, device for refining molten steel and application |
-
1988
- 1988-09-30 JP JP24647988A patent/JP2718093B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0293289A (en) | 1990-04-04 |
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