JPH0792337B2 - DC arc type scrap melting and refining furnace - Google Patents
DC arc type scrap melting and refining furnaceInfo
- Publication number
- JPH0792337B2 JPH0792337B2 JP3226088A JP22608891A JPH0792337B2 JP H0792337 B2 JPH0792337 B2 JP H0792337B2 JP 3226088 A JP3226088 A JP 3226088A JP 22608891 A JP22608891 A JP 22608891A JP H0792337 B2 JPH0792337 B2 JP H0792337B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- arc
- shell
- hearth
- arc type
- 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
-
- 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
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、直流アーク式スクラッ
プ溶解精錬炉に関するものである。BACKGROUND OF THE INVENTION The present invention relates to a DC arc type scraper.
It relates to a melting and refining furnace .
【０００２】[0002]
【従来の技術】製鋼用アーク炉は、主として三相交流ア
ーク炉が用いられてきたが、近年直流アーク炉も盛んに
用いられるようになって来た。直流アーク炉は、従来、
図３に示すように、有底円筒状の炉殻1 の底部内周面に
は耐火物がライニングされて炉床2 が形成されており、
炉殻1 の側部内周面には前記炉床2 の上端から炉頂にか
けて耐熱性の炉壁3 が付設されている。従来、該炉壁3
は耐火レンガによって構成されていたが、近年水冷パネ
ルが使用されることも多い。図例の炉壁3 は水冷パネル
のものを示している。炉頂には、炉蓋4 が開閉自在に設
けられており、炉蓋4 の中央部には陰極を構成する黒鉛
電極5 が昇降自在に垂下されており、一方、炉床2 には
陽極6 が装着されている。7 は炉内燃性ガスを排気する
ための集塵用エルボである。炉内に装入された原料は、
陽極6 と導通状態にあり、原料に向って黒鉛電極5 の先
端からプラズマアーク9を発生させ、プラズマアーク9
の高温を利用して原料を溶解し、鋼浴8 を得る。2. Description of the Related Art As a steelmaking arc furnace, a three-phase AC arc furnace has been mainly used, but in recent years, a DC arc furnace has also been actively used. DC arc furnaces have traditionally been
As shown in FIG. 3, a refractory material is lined on the inner peripheral surface of the bottom of the bottomed cylindrical furnace shell 1 to form a hearth 2.
A heat-resistant furnace wall 3 is attached to the inner surface of the side of the furnace shell 1 from the upper end of the hearth 2 to the furnace top. Conventionally, the furnace wall 3
Was made of refractory bricks, but in recent years water-cooled panels are often used. The furnace wall 3 in the illustrated example is a water-cooled panel. A furnace lid 4 is openably and closably installed on the top of the furnace, and a graphite electrode 5 that constitutes a cathode is hung down in the center of the furnace lid 4, while an anode 6 is installed on the hearth 2. Is installed. 7 is a dust collecting elbow for exhausting the furnace internal combustion gas. The raw materials charged in the furnace are
The plasma arc 9 is generated from the tip of the graphite electrode 5 toward the raw material, which is in conduction with the anode 6.
The high temperature of is used to melt the raw materials to obtain the steel bath 8.
【０００３】[0003]
【発明が解決しようとする課題】従来、直流アーク炉の
炉体は、電極の取付構造を除いて、三相交流アーク炉と
同様の構造が適用されており、炉殻高さ (炉殻内底面か
ら炉頂までの高さ) Ｈと炉底部における炉殻内径Ｄとの
比Ｈ／Ｄは0.7 以下とされていた。その理由は、交流ア
ーク炉ではＨ／Ｄを大きくすると電極部のインピーダン
スが大きくなり、効率が低下するためである。Conventionally, a furnace body of a DC arc furnace has the same structure as that of a three-phase AC arc furnace except for the electrode mounting structure. The ratio H / D between the height H from the bottom to the top of the furnace) H and the inner diameter D of the furnace shell at the bottom of the furnace was set to 0.7 or less. The reason for this is that in an AC arc furnace, increasing the H / D increases the impedance of the electrode portion and reduces the efficiency.
【０００４】しかしながら、Ｈ／Ｄが0.7 以下と炉殻高
さが低いため、黒鉛電極先端から発生するアークジェッ
トにより鋼浴8 から飛散した多量のスプラッシュが集塵
用エルボ7 を介して外部に放出され、歩留りの低下の一
因となっている。特に、電力レベル (ＫＶＡ／ton)の高
いＵＨＰアーク炉では、図１のように電極が１本であ
り、アークジェットが強力であり、スプラッシュの発生
が著しい。However, since the H / D is 0.7 or less and the height of the furnace shell is low, a large amount of splash scattered from the steel bath 8 is released to the outside through the dust collecting elbow 7 by the arc jet generated from the tip of the graphite electrode. This is one of the causes of the decrease in yield. In particular, in a UHP arc furnace with a high power level (KVA / ton), there is only one electrode as shown in FIG. 1, the arc jet is strong, and splashing is remarkable.
【０００５】また、装入原料の崩落前において高温の燃
焼ガスが炉内挿入原料内を通過する間に、これらを予熱
する時間が短く、熱効率が悪いという問題がある。本発
明はかかる問題に鑑みなされたもので、歩留り、熱効率
の高い直流アーク式スクラップ溶解精錬炉を提供するこ
とを目的とする。Further, there is a problem in that, while the high temperature combustion gas passes through the raw material to be inserted into the furnace before the collapse of the charged raw material, the time for preheating these is short and the thermal efficiency is poor. The present invention has been made in view of the above problems, and an object of the present invention is to provide a DC arc type scrap melting and refining furnace with high yield and high thermal efficiency.
【０００６】[0006]
【課題を解決するための手段】本発明の直流アーク式ス
クラップ溶解精錬炉は、炉殻の底部内面に耐火物によっ
て炉床が形成され、炉殻の側部内面に耐熱性の炉壁が付
設された直流アーク式スクラップ溶解精錬炉において、
炉殻高さＨと炉底部における炉殻内径Ｄとの比Ｈ／Ｄを
０．９以上とする。この場合、炉壁内面は炉床上部から
炉頂にかけて炉中心線側に傾いたテーパ面で形成するの
がよい。SUMMARY OF THE INVENTION The DC arc type switch of the present invention.
The clap melting and refining furnace is a DC arc type scrap melting and refining furnace in which a hearth is formed by a refractory material on the inner surface of the bottom of the furnace shell, and a heat resistant furnace wall is attached to the inner surface of the side of the furnace shell.
The ratio H / D between the height H of the furnace shell and the inner diameter D of the furnace shell at the bottom of the furnace is set to 0.9 or more. In this case, it is preferable that the inner surface of the furnace wall is formed by a tapered surface inclined from the upper part of the hearth to the top of the furnace toward the center line of the furnace.
【０００７】[0007]
【作用】炉殻高さＨと炉底部における炉殻内径Ｄとの比
Ｈ／Ｄを0.9 以上としたので、炉体は縦に長い形状とな
り、黒鉛電極の先端から発生するアークジェットによっ
て鋼浴から飛散する多量のスプラッシュが炉蓋に到達し
難くなり、炉蓋に取付けられた集塵用エルボを介して外
部へ放出されるのが抑制される。また、アーク熱源で発
生した炉内燃焼ガスが装入原料間を通過して炉頂に至る
間、ガスの保有熱量を原料に十分付与することができ、
高温ガスの熱交換率を高めることができる。この際、Ｈ
／Ｄを0.9 以上にするのは、0.9 未満では上記作用を十
分発揮させることが困難だからである。尚、本発明は直
流アーク炉を対象としているため、Ｈ／Ｄを0.9 以上と
することによってＨが大きくなり、これに伴って黒鉛電
極の長さが長くなっても、インピーダンスの増大はほと
んど生じず、効率の低下は問題とならない。Since the ratio H / D of the height H of the furnace shell and the inner diameter D of the furnace shell at the bottom is set to 0.9 or more, the furnace body has a vertically long shape and the steel jet is generated by the arc jet generated from the tip of the graphite electrode. It becomes difficult for a large amount of splashes scattered from the furnace lid to reach the furnace lid, and is suppressed from being discharged to the outside via the dust collecting elbow attached to the furnace lid. Further, while the combustion gas in the furnace generated by the arc heat source passes between the charged raw materials and reaches the furnace top, it is possible to sufficiently give the raw material the amount of heat possessed by the gas,
The heat exchange rate of the high temperature gas can be increased. At this time, H
The reason why / D is set to 0.9 or more is that if it is less than 0.9, it is difficult to sufficiently exhibit the above-mentioned action. Since the present invention is intended for the DC arc furnace, H is increased by setting H / D to 0.9 or more, and even if the length of the graphite electrode is increased accordingly, almost no increase in impedance occurs. Therefore, the decrease in efficiency is not a problem.
【０００８】また、炉壁内面を炉床上部から炉頂にかけ
て炉中心線側に傾いたテーパ面で形成することにより、
アーク熱源から炉壁内面までの距離を縮めることがで
き、炉壁内面における熱負荷 (受熱量) の減少を防止す
ることができる。これによって、炉壁に付着したスプラ
ッシュの再溶解が促進され、スプラッシュ付着物の残存
を防止することができ、歩留りの向上、炉内整備性の向
上を図ることができる。尚、熱負荷は装入原料の崩落後
のアーク熱源からの距離の２乗に比例するので、炉壁内
面を炉頂側が縮径したテーパ面で形成することにより、
大きな効果が得られる。Further, by forming the inner surface of the furnace wall with a tapered surface inclined from the upper part of the hearth to the top of the furnace toward the center line of the furnace,
The distance from the arc heat source to the inner surface of the furnace wall can be shortened, and the reduction of the heat load (heat receiving amount) on the inner surface of the furnace wall can be prevented. As a result, the redissolution of the splash adhered to the furnace wall is promoted, the splash adhered matter can be prevented from remaining, and the yield and the maintainability in the furnace can be improved. Since the heat load is proportional to the square of the distance from the arc heat source after the collapse of the charging raw material, by forming the inner surface of the furnace wall with a tapered surface with the furnace top side having a reduced diameter,
Great effect can be obtained.
【０００９】[0009]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。尚、従来例と同一名称の部材には同一符号を付
し、構造が相違する点を中心に説明する。図１は実施例
に係わる直流アーク式スクラップ溶解精錬炉を示してお
り、炉体11には炉蓋4 が開閉自在に設けられており、炉
体11は炉殻1 によってその外周面が形成され、炉殻1 は
炉殻高さＨと炉殻内径Ｄとの比Ｈ／Ｄが0.9 以上であっ
て、縦長形状をしている。炉殻1 の底部内周面には、従
来と同様、炉床2 が耐火材で形成されており、その上端
はスラグレベル（Ｓ．Ｌ）のやや上部に位置している。
Ｍ．Ｌは鋼浴レベルである。Embodiments of the present invention will be described below with reference to the drawings. The members having the same names as those in the conventional example are designated by the same reference numerals, and the difference in structure will be mainly described. FIG. 1 shows a DC arc type scrap melting and refining furnace according to an embodiment, in which a furnace body 11 is provided with a furnace lid 4 which can be opened and closed, and the furnace body 11 has an outer peripheral surface formed by a furnace shell 1. , The ratio H / D of the height H of the furnace shell and the inner diameter D of the furnace shell is 0.9 or more, and the furnace shell 1 has a vertically long shape. As in the conventional case, the hearth 2 is formed of refractory material on the inner peripheral surface of the bottom of the furnace shell 1, and its upper end is located slightly above the slag level (SL).
M. L is the steel bath level.
【００１０】炉殻1 の側部は、前記炉床2 の上端部から
炉頂にかけて縮形して形成されており、その内面は炉中
心線に対してθ＝ 5゜〜20゜程度傾斜して形成されてい
る。そして、その内周面に沿って、水冷パネルからなる
炉壁3 が付設されている。図２は、実施例に係る直流ア
ーク電気炉の操業状態を示しており、スクラップを主原
料とし石灰やコークスを含む装入原料12の中央部を溶解
して、１本の黒鉛電極5 が垂下している。電極先端と炉
床2 に溜まった溶鋼13との間にアークプラズマ9 が発生
しており、アーク熱源の回りの原料を順次溶解してい
る。この溶解の際に生じた、スクラップ付着物や炭素等
の炉内燃焼ガスは図中矢印のように未溶解の装入原料の
間を通って、これらを加熱して、集塵用エルボ7 から排
出される。装入原料が崩落後、鋼浴に照射されるアーク
ジェットによって多量のスプラッシュが発生するが、炉
殻高さＨが高いので集塵用エルボ7 から放出されにく
い。また、炉壁3 の中間部ないし上部内面に付着して凝
固したスプラッシュも、炉壁3 内面が炉床上部から炉頂
にかけて黒鉛電極5側に傾いたテーパ面で形成されてい
るため、アーク熱源からの距離が小さくなり、熱負荷
(受熱量) が大きく、再溶解し易くなる。The side of the furnace shell 1 is formed by contracting from the upper end of the hearth 2 to the top of the furnace, and its inner surface is inclined by θ = 5 ° to 20 ° with respect to the center line of the furnace. Is formed. A furnace wall 3 made of a water-cooled panel is attached along the inner peripheral surface of the furnace wall 3. FIG. 2 shows the operating state of the DC arc electric furnace according to the example, in which the central portion of the charging raw material 12 containing scrap as the main raw material and containing lime and coke is melted, and one graphite electrode 5 droops. is doing. An arc plasma 9 is generated between the electrode tip and the molten steel 13 accumulated in the hearth 2, and the raw materials around the arc heat source are sequentially melted. The in-furnace combustion gas, such as scrap deposits and carbon, generated during this melting passes between the unmelted charging raw materials as shown by the arrow in the figure, and these are heated to remove them from the dust collecting elbow 7. Is discharged. After the charging raw material collapses, a large amount of splash is generated by the arc jet irradiated to the steel bath, but since the furnace height H is high, it is difficult to release it from the dust collecting elbow 7. In addition, the splash that adheres to and solidifies in the middle or upper part of the furnace wall 3 is also an arc heat source because the inner surface of the furnace wall 3 is formed by a tapered surface inclined from the upper part of the hearth to the top of the furnace toward the graphite electrode 5 side. The distance from
It has a large (heat receiving amount) and is easily redissolved.
【００１１】次に、具体的実施例を掲げる。図１のよう
に、炉殻高さＨ＝7000mm、炉床部における炉殻内径Ｄ＝
7000φmm、炉頂部における炉殻内径ｄ＝5000φmmの炉殻
を製作し、炉殻側部内周面に沿って炉床上部に水冷パネ
ルを付設して炉壁を形成した。該実施例の炉体 (炉内容
量149m3)を用いて、１本電極式の直流電気炉を構成し、
スクラップ等の原料（初回装入量90ton)を装入し、通電
して原料の溶解、製錬を行った。Next, specific examples will be given. As shown in FIG. 1, the height H of the furnace shell is 7000 mm, and the inner diameter D of the furnace shell in the hearth is D =
A furnace shell having a diameter of 7000 mm and an inner diameter d of the furnace at the top of the furnace of d = 5000 mm was manufactured, and a water cooling panel was attached to the upper part of the hearth along the inner peripheral surface of the side wall of the furnace to form a furnace wall. Using the furnace body of the example (internal volume 149 m 3 ) to form a one-electrode type DC electric furnace,
Raw materials such as scrap (initial loading amount 90 tons) were charged, and electricity was supplied to melt and smelt the raw materials.
【００１２】その結果、従来のＨ＝5540mm、Ｄ＝ｄ＝70
00φmm、炉内容積127m3 の有底円筒形炉体を用い、同条
件で操業した場合に比べて、スクラップの積高さが実施
例では約4000mmから5400mmと35％増大したため、原料装
入の際のならし作業は不要となり、また炉内燃焼ガスが
スクラップ中を通過することによるスクラップへの受熱
量が約35％増大し、溶解期の総合熱効率が向上した。ま
た、実施例では炉高が約1400mm高くなったことに起因し
て、鋼浴レベル(M.L) から炉頂までの高さが3000mmから
4500mmとなり、スクラップの崩落後に、アークジェット
によって発生したスプラッシュの集塵用エルボからの放
出が約35％軽減された。また、炉壁はその頂部が縮径
し、その内面が炉中心線側に傾斜しているため、アーク
熱源からの距離が傾斜させない場合に比べて短縮されて
おり、スプラッシュの付着残留量が大幅に減少した。As a result, the conventional H = 5540 mm, D = d = 70
Compared to the case where a bottomed cylindrical furnace body with a diameter of 00 φ mm and an inner volume of 127 m 3 was used and the operation was carried out under the same conditions, the stack height of scrap increased from about 4000 mm to 5400 mm by 35% in the example, so No need for rectification work, and the amount of heat received by the scrap as the combustion gas in the furnace passed through the scrap increased by about 35%, improving the overall thermal efficiency during the melting period. In addition, in the example, the height from the steel bath level (ML) to the top of the furnace was 3000 mm due to the fact that the furnace height was increased by about 1400 mm.
It became 4500 mm, and the emission from the dust collecting elbow generated by the arc jet after the collapse of scrap was reduced by about 35%. Also, since the top of the furnace wall is reduced in diameter and the inner surface is inclined toward the furnace centerline, the distance from the arc heat source is shorter than when not inclined, and the amount of splash residue remaining is significantly reduced. Decreased to.
【００１３】[0013]
【発明の効果】以上説明した通り、本発明の直流アーク
式スクラップ溶解精錬炉は、炉殻高さＨと炉殻内径Ｄと
の比Ｈ／Ｄが0.9 以上としたので、従来に比べて炉高が
高くなり、炉内燃焼ガスの保有熱をスクラップへ十分供
給することができ、熱交換率の向上による溶解期の総合
熱効率を向上させることができ、またスクラップ崩落後
のアークジェットによるスプラッシュの集塵用エルボか
らの放出を抑制することができ、歩留りの向上に資する
ことができる。As described above, the DC arc of the present invention
Wherein the scrap smelting furnace, because furnace shell ratio H / D between the height H and the furnace shell inside diameter D was 0.9 or more, the furnace height becomes higher than the conventional, scrap the potential heat of the furnace combustion gas , It is possible to improve the total thermal efficiency in the melting period by improving the heat exchange rate, and it is possible to suppress the release of splash from the dust collecting elbow due to the arc jet after the scrap collapse. It can contribute to the improvement of yield.
【００１４】また、炉壁内面を炉床上部から炉頂にかけ
て炉中心線側に傾いたテーパ面で形成することにより、
アーク熱源と炉壁内面との距離が短縮され、炉壁に付着
したスプラッシュの再溶解を促進することができ、歩留
の向上、炉壁整備の容易化を図ることができる。Further, by forming the inner surface of the furnace wall with a taper surface inclined from the upper part of the hearth to the top of the furnace toward the center line of the furnace,
The distance between the arc heat source and the inner surface of the furnace wall is shortened, the re-melting of the splash adhered to the furnace wall can be promoted, the yield can be improved, and the maintenance of the furnace wall can be facilitated.
【図１】実施例に係わる直流アーク式スクラップ溶解精
錬炉の断面図である。FIG. 1 DC arc type scrap melting and refining according to an embodiment
It is sectional drawing of a smelting furnace.
【図２】同アーク炉の操業状態における断面図である。FIG. 2 is a sectional view of the arc furnace in an operating state.
【図３】従来例の直流アーク炉の断面図である。FIG. 3 is a cross-sectional view of a conventional DC arc furnace.
1 炉殻 2 炉床 3 炉壁 4 炉蓋 5 黒鉛電極 6 陽極 7 集塵用エルボ 1 Furnace shell 2 Hearth 3 Furnace wall 4 Furnace lid 5 Graphite electrode 6 Anode 7 Elbow for dust collection
Claims (2)
形成され、炉殻の側部内面に耐熱性の炉壁が付設された
直流アーク式スクラップ溶解精錬炉において、 炉殻高さＨと炉底部における炉殻内径Ｄとの比Ｈ／Ｄを
０．９以上とすることを特徴とする直流アーク式スクラ
ップ溶解精錬炉。1. A DC arc type scrap melting and refining furnace in which a hearth is formed of a refractory material on the inner surface of the bottom of the furnace shell, and a heat resistant furnace wall is attached to the inner surface of the side portion of the furnace shell. DC arc type scrubber, characterized in that the ratio H / D between the inner diameter D of the furnace shell at the bottom of the furnace and 0.9
Smelting and refining furnace .
心線側に傾いたテーパ面で形成されている請求項１に記
載した直流アーク式スクラップ溶解精錬炉。2. The DC arc scrap melting and refining furnace according to claim 1, wherein the inner surface of the furnace wall is formed by a tapered surface inclined from the upper part of the hearth to the top of the furnace toward the center line of the furnace .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3226088A JPH0792337B2 (en) | 1991-09-05 | 1991-09-05 | DC arc type scrap melting and refining furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3226088A JPH0792337B2 (en) | 1991-09-05 | 1991-09-05 | DC arc type scrap melting and refining furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0566089A JPH0566089A (en) | 1993-03-19 |
| JPH0792337B2 true JPH0792337B2 (en) | 1995-10-09 |
Family
ID=16839636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3226088A Expired - Lifetime JPH0792337B2 (en) | 1991-09-05 | 1991-09-05 | DC arc type scrap melting and refining furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0792337B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106197006B (en) * | 2016-07-04 | 2018-03-20 | 内蒙古纳顺装备工程(集团)有限公司 | A kind of mineral hot furnace body of heater |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE400013B (en) * | 1974-07-23 | 1978-03-06 | Asea Ab | DEVICE FOR DIRECTION-FEED LIGHT BACK OVEN |
-
1991
- 1991-09-05 JP JP3226088A patent/JPH0792337B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0566089A (en) | 1993-03-19 |
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