JPH10280030A - Repaired side wall of rh vacuum degassing furnace and method for repairing rh vacuum degassing furnace - Google Patents

Repaired side wall of rh vacuum degassing furnace and method for repairing rh vacuum degassing furnace

Info

Publication number
JPH10280030A
JPH10280030A JP9974797A JP9974797A JPH10280030A JP H10280030 A JPH10280030 A JP H10280030A JP 9974797 A JP9974797 A JP 9974797A JP 9974797 A JP9974797 A JP 9974797A JP H10280030 A JPH10280030 A JP H10280030A
Authority
JP
Japan
Prior art keywords
refractory brick
side wall
vacuum degassing
furnace
repair
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.)
Pending
Application number
JP9974797A
Other languages
Japanese (ja)
Inventor
Isao Imai
功 今井
Setsuo Kai
節雄 甲斐
Masahiko Kijima
正彦 木島
Toshiaki Yamagata
俊明 山形
Koichi Ura
宏一 浦
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.)
Coorstek KK
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Toshiba Ceramics Co Ltd
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 Sumitomo Metal Industries Ltd, Toshiba Ceramics Co Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP9974797A priority Critical patent/JPH10280030A/en
Publication of JPH10280030A publication Critical patent/JPH10280030A/en
Pending legal-status Critical Current

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  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Abstract

PROBLEM TO BE SOLVED: To simply repair the damaged side wall in an RH vacuum degassing furnace for molten steel in good working efficiency and to provided a repaired side wall having excellent durability. SOLUTION: In the lining repairing side wall in the RH vacuum degassing furnace, a refractory brick layer 30 is formed in the peripheral direction of the repairing zone and connected with the side wall 3 in the repaired zone through a gap filled with monolithic refractories 4, 4' and before reusing the furnace, the metal-made supporting body supports a refractory brick 31 and at the time of reusing, the metal-made supporting body is eroded and thereafter, the position contacting with the molten steel is formed with the brick 31. The lining repairing method of a lower vessel in the RH vacuum degassing furnace consists of (1) a detecting process for detecting the damage part in the furnace, (2) a bottom surface 1C repairing process for horizontally repairing the damage position of the furnace bottom part, (3) a refractory brick layer charging process for charging and setting the refractory brick layer 30 formed by closely setting to the outer peripheral surface of the metal-made cylindrical supporting body through the gap so as to be faced to be the side wall to be repaired and (4) a process for filling up the monolithic refractories 4, 4' into the gap formed in the refractory brick layer charging process.

Description

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

【0001】[0001]

【発明の属する技術分野】本発明はRH真空脱ガス炉補
修側壁及びRH真空脱ガス炉の補修方法に関する。特
に、RH真空脱ガス炉の真空槽の下部槽に好適な補修側
壁及びその補修方法に関する。
The present invention relates to a repair side wall for an RH vacuum degassing furnace and a method for repairing the RH vacuum degassing furnace. In particular, the present invention relates to a repair side wall suitable for a lower tank of a vacuum tank of an RH vacuum degassing furnace and a repair method thereof.

【0002】[0002]

【従来の技術】転炉で精錬あるいは電気炉で溶製した溶
鋼には酸素、水素、窒素などのガス成分が多く含有され
ており、これらガス成分が溶鋼の凝固時あるいは凝固後
に析出し製品に様々な欠陥が生じることがある。よって
溶鋼中の前記ガス成分を減少させ、これらの欠陥を解消
するとともに非金属介在物を減少させ濃度、温度および
成分を均一化し、内質および機械的性質を向上するた
め、真空脱ガス炉が用いられている。このような真空脱
ガス炉の代表的なものにRH真空脱ガス炉がある。
2. Description of the Related Art Molten steel refined in a converter or smelted in an electric furnace contains a large amount of gas components such as oxygen, hydrogen, and nitrogen, and these gas components precipitate during or after solidification of the molten steel to produce products. Various defects may occur. Therefore, in order to reduce the gas components in the molten steel, eliminate these defects and reduce non-metallic inclusions, make the concentration, temperature and components uniform, and improve the internal quality and mechanical properties, a vacuum degassing furnace is used. Used. A typical example of such a vacuum degassing furnace is an RH vacuum degassing furnace.

【0003】一般的なRH真空脱ガス炉は、例えば、模
式的断面図を示した図10のような構造である。RH真
空脱ガス炉は、鉄皮の内面に耐火レンガを内張りした真
空槽100を有し、この真空槽100は、互いに分離可
能な上部槽150および下部槽160を有する。上部槽
150上端には天蓋170が設けられており、排気口、
合金投入口なども備える。下部槽160の底部は2本の
環流管140が設けられており、環流管140はさらに
一端が取鍋110中の溶鋼130に浸漬される浸漬管1
80へと接続され、上昇管101および下降管102を
形成する。真空ポンプ(図示せず)等で真空槽100内
に溶鋼130を吸い上げるが、この吸い上げはあるレベ
ルで停止する。ここで、ガス吹込み管120よりアルゴ
ンガスなどを上昇管101に吹込めば溶鋼130が上昇
管101を通って上昇し、真空槽100内で溶鋼130
が効率的にガスを発散し脱ガス処理等が行われた後、下
降管102を通って取鍋110へ戻されるという溶鋼1
30の流れが繰り返される。この時、真空槽100内
は、溶鋼130が細粒状に激しく飛散するため、一般的
にマグネシア・クロム質(いわゆるマグクロ質)レンガ
等の耐火物レンガからなる内張り材は時間とともに浸
食、脱落等の不具合を生じるようになる。
[0003] A general RH vacuum degassing furnace has, for example, a structure as shown in FIG. The RH vacuum degassing furnace has a vacuum tank 100 in which a refractory brick is lined on the inner surface of a steel shell. The vacuum tank 100 has an upper tank 150 and a lower tank 160 which can be separated from each other. A canopy 170 is provided at the upper end of the upper tank 150, and an exhaust port,
It also has an alloy inlet. Two reflux pipes 140 are provided at the bottom of the lower tank 160, and the reflux pipe 140 is further provided with an immersion pipe 1 whose one end is immersed in the molten steel 130 in the ladle 110.
80 to form a riser 101 and a downcomer 102. The molten steel 130 is sucked into the vacuum chamber 100 by a vacuum pump (not shown) or the like, but this sucking stops at a certain level. Here, when argon gas or the like is blown into the riser tube 101 from the gas blower tube 120, the molten steel 130 rises through the riser tube 101, and the molten steel 130 rises in the vacuum chamber 100.
Is efficiently returned to the ladle 110 through the downcomer 102 after the gas is efficiently diffused and degassed, etc.
The flow of 30 is repeated. At this time, in the vacuum chamber 100, since the molten steel 130 is scattered violently in fine particles, the lining material made of refractory bricks such as magnesia-chrome (so-called magcro) bricks generally erodes and falls over time. It causes problems.

【0004】RH真空脱ガス炉の補修については、例え
ば第1の例として上昇管部分の補修として円筒状の鋼板
枠を設置し、内張りと鋼板枠との間に含水耐火物を圧入
する補修方法が知られている(特開昭54−10740
4号公報、同57−51225号公報等)。この方法は
含水耐火物で溶損部を補修しても溶損部には一般にスラ
グや地金が浸透しているため補修直後は内張り機能を果
たすものの、継続使用するうちに溶損が進行しスラグや
地金が軟化溶融して補修した含水耐火物の剥離損傷を生
じる恐れがあった。また、第2の例として、特公昭62
−2237号公報では、内張りの溶損部のスラグや地金
等の付着物を溶射バーナの火焔によって溶融除去した
後、引続き溶射バーナにより溶損度の大きい溶損部に耐
火物粉末を溶射して充填補修し、その後、圧入管を連結
した型枠を配設して型枠と溶損部表面との間に形成され
た空間に圧入管からキャスタブル耐火物を圧入充填し溶
損部全体にキャスタブル耐火物の補修層を形成する方法
が提案されている。この方法は、溶射バーナ火焔で付着
スラグや地金を溶融除去し、処理時の残熱作用により溶
損部に対する溶射層やキャスタブル耐火物の接着性が十
分に確保されるため、前記のような継続使用中に溶損が
進行してキャスタブル耐火物が剥離損傷する恐れはな
い。また、第3の例として、特開昭63−93818号
公報では、RH真空脱ガス炉の下部槽新換と共に、上部
層下部の炉内側内周面に沿って鉄板を延設し、この鉄板
の炉壁レンガ側の外側面に沿って補修レンガを積み、こ
の補修レンガと炉壁レンガとの隙間に不定形材を充填し
て補修することを特徴とするRH真空脱ガス炉の補修方
法が開示されている。
[0004] Regarding the repair of the RH vacuum degassing furnace, for example, as a first example, a repair method in which a cylindrical steel frame is installed as a repair of a rising pipe portion, and a refractory containing water is injected between the lining and the steel frame. (Japanese Patent Application Laid-Open No. 54-10740)
No. 4, No. 57-51225). In this method, even if the eroded part is repaired with a hydrated refractory, slag and metal are generally penetrating the eroded part, so the lining works immediately after the repair, but the erosion progresses during continued use. The slag and the ingot may soften and melt to cause peeling damage of the repaired hydrated refractory. As a second example, Japanese Patent Publication Sho 62
According to Japanese Patent No. 2237, after deposits such as slag and metal in the eroded portion of the lining are melted and removed by the flame of the sprayed burner, the refractory powder is continuously sprayed to the eroded portion having a high degree of erosion by the sprayed burner. After filling and repairing, a formwork connected to the press-fitting pipe is arranged, and a castable refractory is press-fitted from the press-fitting pipe to the space formed between the formwork and the surface of the eroded part, and filled into the entire eroded part. A method for forming a repairable layer of castable refractories has been proposed. This method melts and removes adhered slag and metal with a sprayed burner flame, and the residual heat effect during processing ensures sufficient adhesion of the sprayed layer and castable refractory to the eroded portion. During continuous use, there is no danger of erosion progressing and peeling damage of the castable refractory. As a third example, JP-A-63-93818 discloses that an iron plate is extended along the inner peripheral surface of the lower part of the upper layer together with the replacement of a lower tank of an RH vacuum degassing furnace. The repair method of the RH vacuum degassing furnace is characterized in that repair bricks are piled up along the outer surface on the furnace wall brick side, and a gap between the repair brick and the furnace wall brick is filled with an irregular-shaped material and repaired. It has been disclosed.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、上記し
た最初の2つの例による方法は、いずれも補修表面層が
キャスタブル耐火物で形成されるため、RH真空脱ガス
炉の真空槽の内張りに一般に用いられているマグクロ質
レンガ等に比較すると耐食性が劣る。従って、これらの
補修方法は応急的な補修としては有効であるが、補修に
より比較的長期間の使用に耐える耐久性を確保できな
い。また、RH真空脱ガス炉内側壁の損傷補修において
は、内張り耐火レンガを解体し、張替えることが最も確
実な改修であるが、解体する場合は使用済みの耐火レン
ガが廃棄されることになり、作業が繁雑になると同時
に、剥がされた耐火レンガの再利用法が無く、廃棄にあ
たってはレンガ成分のマグネシアやクロムが環境を汚染
してしまうという問題がある。さらに、第3の例による
方法は、上部槽下部の補修方法であって、上部槽よりも
損傷の激しい下部槽の補修についてはやはり、張替えを
せねばならず、前述の問題を生じることになる。本発明
は、上記のような溶鋼の脱ガス処理に用いられるRH真
空脱ガス炉の損傷に対する補修方法を鑑み、環境を汚染
する廃棄物を放出することなく従来の補修方法に比して
耐久性に優れる真空槽の補修側壁及びその方法の提供を
目的とする。発明者らは、上記目的達成のため、補修素
材や補修工法について鋭意検討した。その結果、一時し
のぎ的な補修を止め、補修側壁を新しいRH真空脱ガス
炉真空槽内の耐火物内張り側壁と同様に耐火レンガで形
成することにし、更に、その補修側壁の形成を簡便に行
う工法についても検討し、本発明を完成した。
However, the methods according to the first two examples described above are generally used for lining the vacuum chamber of an RH vacuum degassing furnace since the repair surface layer is formed of a castable refractory. Corrosion resistance is inferior to that of used magcro bricks. Therefore, these repair methods are effective as emergency repairs, but the repairs cannot ensure the durability to withstand relatively long-term use. Also, in repairing the damage to the inner wall of the RH vacuum degassing furnace, the most reliable repair is to dismantle and replace the refractory lining, but when dismantling, the used refractory brick will be discarded. At the same time, the work becomes complicated, and there is no method for reusing the peeled refractory bricks, and there is a problem that magnesia or chrome as a brick component pollutes the environment upon disposal. Further, the method according to the third example is a method for repairing the lower portion of the upper tank, and in the repair of the lower tank which is more severely damaged than the upper tank, the repair must be performed again, which causes the above-described problem. . In view of the above-mentioned repair method for the damage of the RH vacuum degassing furnace used for the degassing treatment of molten steel as described above, the present invention has a more durable compared to the conventional repair method without discharging waste that pollutes the environment. The purpose of the present invention is to provide a repairing side wall of a vacuum chamber and a method for the same, which are excellent in performance. The inventors have intensively studied repair materials and repair methods in order to achieve the above object. As a result, temporary repairs are stopped, and the repair side walls are formed of refractory bricks in the same way as the refractory lining side walls in the new RH vacuum degassing furnace vacuum chamber, and the repair side walls are formed easily. The present invention was also completed by studying the above.

【0006】[0006]

【課題を解決するための手段】本発明によれば、RH真
空脱ガス炉の内張り補修側壁であって、補修域の周方向
に耐火レンガ層を形成し、該耐火レンガ層は不定形耐火
物が充填された間隙を介して該補修域の側壁に接続され
ており、炉の再使用前には金属製支持体が耐火レンガを
支持しており、再使用時には金属製支持体が溶損し、そ
の後、溶鋼と接する部位が耐火レンガで形成されてなる
ことを特徴とする脱ガス炉補修側壁が提供される。な
お、金属製支持体の材質は処理鋼種と同じかもしくは
C、Mn、P、S等の不純物が処理鋼種以下の鋼材、例
えばSS材、SC材の任意の鋼材を使用することが好ま
しい。また、耐火レンガもMgO−C質やスピネル質等
が好ましいが、マグクロ質であることが特に好ましい。
According to the present invention, a refractory brick layer is formed on a lining repair side wall of an RH vacuum degassing furnace in a circumferential direction of a repair area, and the refractory brick layer is formed of an irregular refractory. Is connected to the side wall of the repair area through a gap filled with, the metal support supports the refractory brick before reuse of the furnace, the metal support is melted when reused, Thereafter, a degassing furnace repair side wall is provided in which a portion in contact with molten steel is formed of refractory brick. The material of the metal support is preferably the same as that of the treated steel type or a steel material having impurities such as C, Mn, P, and S equal to or less than the treated steel type, for example, any steel material of SS material or SC material. The refractory brick is also preferably of MgO-C or spinel, but is particularly preferably of magcro.

【0007】また、本発明は、RH真空脱ガス炉の下部
槽の内張り補修側壁であって、補修域の側壁に沿って一
周する2以上の多段のマグクロ質の耐火レンガ層が、補
修域の側壁と空隙を有して同心の円筒状あるいは多角筒
状に立設し、該空隙が不定形耐火物で充填されてなるこ
とを特徴とするRH真空脱ガス炉補修側壁を提供する。
Further, the present invention provides a lining repair side wall of a lower tank of an RH vacuum degassing furnace, wherein two or more multi-stage refractory brick layers surrounding the repair area are provided with two or more stages of magcro-type refractory brick layers. A repair side wall for an RH vacuum degassing furnace, characterized in that the side wall is provided upright in a concentric cylindrical or polygonal cylindrical shape having a gap with a side wall, and the gap is filled with an irregular refractory.

【0008】更に、本発明によれば、第1に、RH真空
脱ガス炉の内張り補修方法であり、補修する損傷部位が
炉内周側壁であり、被補修周側壁と空間部を介して同心
状に耐火レンガ層を2以上の多段に筒状に立設し、該被
補修周側壁と該レンガ層との間の空間部に不定形耐火物
を充填することを特徴とするRH真空脱ガス炉の補修方
法が提供される。第2に、RH真空脱ガス炉の内張り補
修方法であり、補修する損傷部位が炉内の全周域で高さ
方向の一部であり、被補修周側壁と空間部を介して同心
状に耐火レンガ層を配設し、且つ、該耐火レンガ層の上
下部の一方または双方を連続して対応する該被補修周側
壁の上下端部に連結し、該被補修周側壁と該耐火レンガ
層との空間部に不定形耐火物を充填することを特徴とす
るRH真空脱ガス炉の補修方法が提供される。
Further, according to the present invention, firstly, there is provided a method for repairing a lining of an RH vacuum degassing furnace, wherein a damaged portion to be repaired is a furnace inner peripheral side wall, and is concentric with the repaired peripheral side wall via a space. RH vacuum degassing, characterized in that a refractory brick layer is erected in two or more stages in a tubular shape, and a space between the repaired peripheral side wall and the brick layer is filled with an irregular refractory. Furnace repair methods are provided. Secondly, there is a method of repairing the lining of the RH vacuum degassing furnace, in which the damaged portion to be repaired is a part of the height direction in the entire circumference of the furnace, and is concentric with the repaired peripheral side wall via the space. A refractory brick layer is provided, and one or both of the upper and lower portions of the refractory brick layer are continuously connected to upper and lower ends of the corresponding peripheral wall to be repaired, and the peripheral wall to be repaired and the refractory brick layer are connected. And a method for repairing an RH vacuum degassing furnace, characterized by filling an irregular shaped refractory into the space.

【0009】本発明の上記脱ガス炉の補修方法におい
て、前記補修する損傷部位がRH真空脱ガス炉の下部槽
の内張りである場合に特に適用することにより効果的で
あり好ましい。また、前記耐火レンガ層が、その内周面
を金属製支持体により支持されていることが好ましく、
その金属製支持体が円筒状あるいは多角筒状であること
が好ましい。更に、耐火レンガ層が、各段毎に予め前記
金属製支持体と共に前記被補修周側壁と対応する形状に
合わせて形成されて、炉内に装入配設されることが好ま
しく、その耐火レンガ層の各段が嵌合部を有して形成さ
れると共に、該嵌合部を介して嵌合されて多段に配設さ
れることが好ましい。更にまた、耐火レンガ層を形成す
る耐火レンガは、MgO−C質やスピネル質、マグクロ
(マグネシア・クロム)質を用いることが好ましいが、
中でもマグクロ質であることが特に好ましい。
In the above method for repairing a degassing furnace of the present invention, it is more effective and preferable to apply particularly when the damaged portion to be repaired is the lining of a lower tank of an RH vacuum degassing furnace. Further, it is preferable that the refractory brick layer has its inner peripheral surface supported by a metal support,
Preferably, the metal support is cylindrical or polygonal cylindrical. Further, it is preferable that a refractory brick layer is formed in advance in each furnace together with the metal support so as to conform to the shape corresponding to the repaired peripheral side wall, and is charged and disposed in the furnace. It is preferable that each step of the layer is formed to have a fitting portion, and the layers are fitted through the fitting portion and arranged in multiple stages. Further, the refractory brick forming the refractory brick layer is preferably made of MgO-C, spinel, or magcro (magnesia-chrome).
Above all, it is particularly preferable to be magcro.

【0010】更にまた、本発明は、RH真空脱ガス炉の
下部槽の内張り補修方法であり、(1)炉内損傷を検査
する検査工程、(2)炉底部の損傷箇所を水平に補修す
る底面補修工程、(3)円筒状あるいは多角筒状の金属
製支持体外周面に密接して配列して形成した耐火レンガ
層を被補修側壁と対面するように間隙を介して装入配設
する耐火レンガ層装入工程、(4)耐火レンガ層装入工
程で形成された間隙に不定形耐火物を充填する工程を有
することを特徴とするRH真空脱ガス炉の補修方法を提
供する。
Furthermore, the present invention relates to a method for repairing a lining of a lower tank of an RH vacuum degassing furnace, wherein (1) an inspection step for inspecting damage in the furnace, and (2) a damaged portion on a furnace bottom is repaired horizontally. Bottom surface repair step, (3) A refractory brick layer formed in close contact with the outer peripheral surface of the cylindrical or polygonal cylindrical metal support is inserted and disposed via a gap so as to face the side wall to be repaired. A method for repairing an RH vacuum degassing furnace, comprising: a step of charging a refractory brick layer; and (4) a step of filling an irregular refractory into a gap formed in the step of charging a refractory brick layer.

【0011】本発明は上記のように構成され、RH真空
脱ガス炉の真空槽の損傷のある所定の被補修側壁箇所に
合致するようにほぼ同形状に耐火レンガ層を多段に積み
被補修側壁に沿って並行に配置すると共に、その耐火レ
ンガ層が、被補修周側壁と独立して空間部を介して筒状
体を形成するようにして、被補修側壁とその耐火レンガ
層との間の空間部に不定形耐火物を充填することから、
被補修側壁の内側に沿ってほぼ同形状の不定形耐火物の
補修側壁が形成される。従って、真空槽内の内張りの再
構築のように、損傷した内張りを撤去したり、損傷側壁
に付着したスラグや地金等を溶融除去したりする煩雑な
操作をすることなく耐火レンガ層を配置することがで
き、溶鋼に接する補修側壁表面には不定形耐火物が露出
することがないため、長期間の耐久性を付与できる。本
発明のRH真空脱ガス炉の補修は、侵食が著しく損傷の
激しいRH真空脱ガス炉の下部槽側壁に適用して最も効
果的である。また、真空槽内下部域の内部底面部が著し
く損傷されている場合には、その底面部も不定形耐火物
で平坦面に補修し、その上に同様の耐火レンガ層を形成
することにより耐久性のよい補修側壁を形成することが
できる。
The present invention is constructed as described above, and the refractory brick layers are stacked in substantially the same shape in multiple stages so as to conform to a predetermined damaged repaired sidewall portion of the vacuum chamber of the RH vacuum degassing furnace. Along with the refractory brick layer, so that the refractory brick layer forms a cylindrical body through the space independently of the repaired peripheral side wall, between the repair side wall and the refractory brick layer Because the space is filled with irregular shaped refractories,
A repair sidewall of an irregular shaped refractory having substantially the same shape is formed along the inside of the repair sidewall. Therefore, as in the case of rebuilding the lining in a vacuum chamber, the firebrick layer is arranged without performing a complicated operation of removing the damaged lining or melting and removing slag, slag and the like attached to the damaged side wall. Since the irregular refractory is not exposed on the repair side wall surface in contact with the molten steel, long-term durability can be imparted. The repair of the RH vacuum degassing furnace of the present invention is most effective when applied to the lower tank side wall of the RH vacuum degassing furnace which is significantly corroded and severely damaged. If the inner bottom surface of the lower part of the vacuum chamber is significantly damaged, the bottom surface is also repaired to a flat surface with irregular refractories, and a similar refractory brick layer is formed on it to make it durable. A good repair side wall can be formed.

【0012】[0012]

【発明の実施の形態】以下、本発明の一実施例を図面を
参照に詳細に説明する。但し、本発明は下記実施例に制
限されるものでない。図1は真空脱ガス処理に用いて損
傷したRH真空脱ガス炉を本発明の方法で補修して補修
側壁を形成した炉(ただし上槽部は省略)の平面図であ
り、図2は図1のII−II線断面図である。図1及び図2
において、RH真空脱ガス炉の真空槽1は、鉄皮1aの
内側に耐火レンガ1bが積み上げられ、この耐火レンガ
1bの内側に更に内張り材のマグクロ質レンガが積み上
げられている。また、真空槽1内の底部1cも同様にマ
グクロ質やアルミナ質等の耐火レンガが敷設される。内
張り材2は、一点鎖線Xで示した初期状態であったもの
が、真空槽1内で溶鋼の脱ガス処理が繰返されることに
より、細粒化された溶鋼により激しい洗條を受けて侵食
され溶損し、内張りの一部が脱落する等実線Yで示した
ような内張り側壁の全周が損傷状態となる。また、底部
1cの表面でも同様に溶損等の損傷が生じてY’状態に
なることがある。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. However, the present invention is not limited to the following examples. FIG. 1 is a plan view of a furnace in which a repair side wall is formed by repairing the RH vacuum degassing furnace damaged by the vacuum degassing process by the method of the present invention (however, an upper tank portion is omitted), and FIG. 1 is a sectional view taken along line II-II of FIG. 1 and 2
In the vacuum chamber 1 of the RH vacuum degassing furnace, the refractory bricks 1b are piled up inside the steel shell 1a, and the magcro bricks as the lining material are further piled up inside the refractory bricks 1b. Similarly, the bottom portion 1c in the vacuum chamber 1 is also provided with a refractory brick made of magcro or alumina. The lining material 2, which was in the initial state shown by the dashed-dotted line X, is eroded by repeated degassing of the molten steel in the vacuum chamber 1 by being subjected to intense washing by finely divided molten steel. The entire periphery of the lining side wall is damaged as shown by the solid line Y, which is melted and a part of the lining falls off. Similarly, damage such as erosion may occur on the surface of the bottom 1c, and the surface may be in the Y 'state.

【0013】上記のような損傷状態の真空槽1に対し、
底面のY’状態の損傷部に不定形耐火物4’を充填し、
また、要すれば、表面部は耐火レンガを敷設し、ほぼ初
期の1c状態に水平に補修する。この水平に補修された
底面上には、耐火レンガで多段に形成された補修側壁3
が、ほぼ内張り材2の初期状態X、即ち、鉄皮1a及び
耐火レンガ1bにより形成される外形状に対応する形状
で、損傷内張り側壁Yと所定の空隙を有して同心円状に
並行に立設される。更に、損傷内張り側壁Yと補修側壁
3との間の空隙には、不定形耐火物4例えばアルミナ・
スピネル質キャスタブル(Al23 84%、MgO
13%)が充填され損傷内張り側壁Yと補修側壁3と
が接続固定される。補修直後には、補修側壁3の内側に
密接して耐火レンガを支持する金属板製円筒体5が同様
に多段にまたは一体に立設される。補修側壁3は内張り
材と同様のマグネシア・クロム質レンガ、例えばダイレ
クトボンドマグクロ質レンガ(MgO 70%、Cr2
3 14%)を用い、目地にマグネシアモルタルを用
いて形成することにより、真空槽の耐久性の向上が著し
く好ましい。上記のように形成される補修側壁3は、損
傷内張り材Yの内側に不定形耐火物4を充填するための
型枠として作用すると同時に、それ自体が新たに内張り
側壁を形成することにもなる。また、補修時に配設する
上記金属板製円筒体5は、補修側壁3の構築時には耐火
レンガ層の支持材として有効に機能し、RH真空脱ガス
炉の再使用においては溶鋼により溶損され消失する。
With respect to the vacuum chamber 1 in the damaged state as described above,
Fill the damaged part in the Y 'state on the bottom with the irregular shaped refractory 4',
If necessary, refractory bricks are laid on the surface, and the surface is repaired horizontally in an almost initial state 1c. On this horizontally repaired bottom surface, there are repair sidewalls 3 made of firebricks in multiple steps.
Has a shape substantially corresponding to the initial state X of the lining material 2, that is, the outer shape formed by the steel shell 1 a and the refractory brick 1 b, and has a predetermined gap with the damaged lining side wall Y and stands parallel and concentrically. Is established. Further, a gap between the damaged lining side wall Y and the repair side wall 3 is provided with an amorphous refractory 4 such as alumina.
Spinel castable (84% Al 2 O 3 , MgO
13%) and the damaged lining side wall Y and the repair side wall 3 are connected and fixed. Immediately after the repair, the metal plate cylindrical body 5 that closely supports the refractory bricks inside the repair side wall 3 is similarly erected in multiple stages or integrally. The repair side wall 3 is made of magnesia-chromic brick similar to the lining material, for example, direct bond magcro brick (MgO 70%, Cr 2
By using O 3 ( 14%) and magnesia mortar for joints, the durability of the vacuum chamber is significantly improved. The repair side wall 3 formed as described above acts as a mold for filling the irregular refractory 4 inside the damaged lining material Y, and at the same time, itself forms a new lining side wall. . In addition, the metal plate-made cylindrical body 5 disposed at the time of repair effectively functions as a support material of the refractory brick layer when the repair side wall 3 is constructed, and is melted and lost by molten steel when reused in the RH vacuum degassing furnace. I do.

【0014】上記のような真空槽1内の損傷状態Yを補
修する方法を下記に説明する。先ず、補修する真空槽1
の損傷の程度を検査し、補修すべき部位を定める。上記
図1及び図2に示したように、その内張り材2の側壁の
全周部及び底部双方の損傷が著しい場合は、第1に真空
槽1の内部底部に不定形耐火物4’を充填して初期底面
の水平状態1cとする。また、再使用条件や損傷状況に
より、必要であれば、底面補修時に不定形耐火物の充填
と同時にその上にマグクロ質レンガ等の耐火レンガを敷
設して初期底部の水平状態1cとなるようにする。次い
で、補修側壁3を垂直方向に2以上に分割して構成する
耐火レンガ層30を多段に配設する。耐火レンガ層30
は、真空槽1内で耐火レンガの組立て作業を行い形成し
てもよい。好ましくは、予め真空槽1外で複数の耐火レ
ンガ層30を形成し、容器内の水平底面に所定に装入配
設する。更に、耐火レンガ層30は、簡便に多段に積み
重ねられるようにすることが作業上好ましい。
A method of repairing the damaged state Y in the vacuum chamber 1 as described above will be described below. First, vacuum tank 1 to be repaired
Inspect the extent of damage and determine the area to be repaired. As shown in FIGS. 1 and 2 above, when both the entire periphery and the bottom of the side wall of the lining material 2 are significantly damaged, first, the inside of the vacuum chamber 1 is filled with the irregular-shaped refractory 4 ′. Then, the horizontal state 1c of the initial bottom surface is obtained. In addition, depending on the reuse conditions and damage conditions, if necessary, at the time of bottom repair, refractory bricks such as magcro bricks are laid on it at the same time as filling with irregular shaped refractory so that the initial bottom horizontal state 1c I do. Next, the refractory brick layer 30 constituted by dividing the repair side wall 3 into two or more in the vertical direction is arranged in multiple stages. Refractory brick layer 30
May be formed by assembling refractory bricks in the vacuum chamber 1. Preferably, a plurality of refractory brick layers 30 are formed in advance outside the vacuum chamber 1 and are charged and arranged on the horizontal bottom surface in the container. Further, it is preferable in terms of work that the refractory brick layer 30 is easily stacked in multiple stages.

【0015】上記耐火レンガ層30の形成について図3
〜図9を参照に以下に説明する。先ず、図3に平面図
(A)及び側面図(B)を示したように、鋼鉄板等の金
属板51を円筒体5に形成する。金属製円筒体5は、組
立てに用いる耐火レンガの高さとほぼ同様の高さで、且
つ、真空槽1の初期側壁Xより小さな直径とする。金属
製円筒体5の直径は、真空槽1の補修され水平状態の底
面1c上に同心円状に配設して、損傷側壁Yとの間に、
補修側壁3を構成する耐火レンガ層30を装入配設し、
更に、損傷側壁Yと補修側壁3(耐火レンガ層30)間
に空隙が生じて不定形耐火物4を充填可能となる空間部
を有するように適宜選択する。通常、耐火レンガ層30
の厚さ、即ち、耐火レンガ31の厚さは約50〜150
mmに形成される。また、空間部幅は約50〜150m
mが好ましい。金属製円筒体5は、その外周に耐火レン
ガを組立てるための支持体とするため、L字状補強部材
52、53、52’及び53’を配置する。L字状補強
部材は、金属製円筒体5の直径とほぼ同一長さで、円筒
体5内の上部と下部にそれぞれ十字状に配置し、変形を
防止して円筒体形状を保持する。前記したように、金属
製円筒5は補修作業後取り外すことなく、脱ガス処理再
開時に溶鋼により溶融され消失させることができる。ま
た、L字状補強部材も円筒体5と同様に金属製のものを
用い、最終的に取り外さなくともよい。通常、下記する
多段に分割された耐火レンガ層30を真空槽1内に装入
配設した後に、取り外し再使用する。
The formation of the refractory brick layer 30 is shown in FIG.
This will be described below with reference to FIGS. First, as shown in a plan view (A) and a side view (B) in FIG. 3, a metal plate 51 such as a steel plate is formed on the cylindrical body 5. The metal cylinder 5 has a height substantially similar to the height of the refractory brick used for assembling, and a diameter smaller than the initial side wall X of the vacuum chamber 1. The diameter of the metal cylinder 5 is arranged concentrically on the repaired and horizontal bottom surface 1c of the vacuum chamber 1 and
The refractory brick layer 30 constituting the repair side wall 3 is charged and arranged,
In addition, an appropriate space is formed between the damaged side wall Y and the repair side wall 3 (the refractory brick layer 30) so as to have a space in which an irregular refractory 4 can be filled. Normally, a firebrick layer 30
, That is, the thickness of the refractory brick 31 is about 50 to 150
mm. The space width is about 50-150m
m is preferred. The metal cylindrical body 5 has L-shaped reinforcing members 52, 53, 52 ', and 53' arranged on the outer periphery thereof as a support for assembling a firebrick. The L-shaped reinforcing members have substantially the same length as the diameter of the metal cylindrical body 5 and are arranged in a cross shape at the upper part and the lower part in the cylindrical body 5 to prevent deformation and maintain the cylindrical body shape. As described above, the metal cylinder 5 can be melted and eliminated by the molten steel when the degassing process is resumed without being removed after the repair work. Also, the L-shaped reinforcing member is made of metal like the cylindrical body 5 and does not have to be removed finally. Usually, the refractory brick layer 30 divided into the following stages is charged and disposed in the vacuum chamber 1 and then removed and reused.

【0016】次に、図4は、耐火レンガ層の平面図
(C)及び一部切り欠いて示した正面図(D)である。
図4において、上記した金属製円筒体5の外周面に沿っ
て、補修側壁3を構成する多段に積まれた各段の耐火レ
ンガ層30を形成する。即ち、各耐火レンガ31をモル
タル目地で金属製円筒5の外周に沿って円筒状に並べ
る。上記のようにL字状補強部材52、53、52’及
び53’により形状保持された金属製円筒体5が内側に
配置されることから、各耐火レンガ31を円筒状に並べ
た際に耐火レンガ層30が内側へ崩れることを防止でき
る。この場合、例えばマグクロ質レンガを用いて目地に
マグネシアモルタルを用いることが好ましい。円筒状に
配列形成された耐火レンガ層30の外周面を帯鋼36を
巻いて、各耐火レンガ31を円筒状耐火レンガ層30と
して固定する。
Next, FIG. 4 is a plan view (C) and a front view (D) of the refractory brick layer, which is partially cut away.
In FIG. 4, along the outer peripheral surface of the above-mentioned metal cylindrical body 5, the refractory brick layers 30 of each of the stacked stages constituting the repair side wall 3 are formed. That is, the refractory bricks 31 are arranged in a cylindrical shape along the outer periphery of the metal cylinder 5 at the mortar joint. As described above, since the metal cylindrical body 5 whose shape is maintained by the L-shaped reinforcing members 52, 53, 52 ', and 53' is disposed inside, when the refractory bricks 31 are arranged in a cylindrical shape, the fire resistance is reduced. It can prevent that the brick layer 30 collapses inside. In this case, it is preferable to use magnesia mortar for joints using, for example, magcro brick. A steel strip 36 is wound around the outer peripheral surface of the refractory brick layers 30 arranged in a cylindrical shape, and each refractory brick 31 is fixed as the cylindrical refractory brick layer 30.

【0017】上記耐火レンガ層30を形成するために用
いる耐火レンガ31について図5を参照にして説明す
る。図5は、耐火レンガ31の一実施例の平面図
(E)、正面図(F)及び側面図(G)である。図5に
おいて、耐火レンガ31は、全体としてはほぼ四角柱で
あり、その上面32及び下面33は、耐火レンガ31を
円筒状に配列できるように外周面となる側面34の面幅
を大きく、内周面となる側面35の面幅を小さくして台
形状に形成される。上面32及び下面33には、耐火レ
ンガ31で円筒状の耐火レンガ層30を複数形成し、図
2に示すように複数段積み重ねた場合に、上下の耐火レ
ンガ層が互いに嵌合して積重ねられるように、嵌合部を
上面32及び下面33を上下で対角するように切欠き、
切欠部321及び331を設け凹凸の嵌合部を形成す
る。また、切欠きはテーパを持たせることにより、積み
重ね時の嵌合をスムーズに行うことができる。
The refractory brick 31 used to form the refractory brick layer 30 will be described with reference to FIG. FIG. 5 is a plan view (E), a front view (F), and a side view (G) of one embodiment of the refractory brick 31. In FIG. 5, the refractory brick 31 is substantially a quadrangular prism as a whole, and the upper surface 32 and the lower surface 33 of the refractory brick 31 have a large width of a side surface 34 serving as an outer peripheral surface so that the refractory brick 31 can be arranged in a cylindrical shape. The side surface 35 serving as the peripheral surface is formed in a trapezoidal shape by reducing the surface width. On the upper surface 32 and the lower surface 33, a plurality of cylindrical refractory brick layers 30 are formed with the refractory bricks 31, and when stacked in multiple stages as shown in FIG. 2, the upper and lower refractory brick layers are fitted together and stacked. As described above, the fitting portion is notched so that the upper surface 32 and the lower surface 33 are diagonally up and down,
Notches 321 and 331 are provided to form an uneven fitting portion. Further, by providing the notch with a taper, the fitting at the time of stacking can be performed smoothly.

【0018】更に、耐火レンガ31が円筒状の耐火レン
ガ層30を形成して内周面となる側面35は、真空槽1
内に配設されて真空槽1の水平底面1cに対して垂直と
なるように形成される。一方、外周面となる側面34
は、耐火レンガ31により形成された円筒状の耐火レン
ガ層30を真空容器内に装入する場合に、後記するよう
にクレーンに吊り下げるための吊り下げ治具を所定にセ
ットできるように加工される。例えば、図5(G)に示
したように中間部341は対面35に平行に垂直に形成
され、中間部341から上下方向でそれぞれ対面35方
向へテーパを持たせた傾斜面342及び343を形成す
る。中間部341は、耐火レンガ層30の外周面で垂直
面を形成することから、前記の帯鋼36を巻く部所とし
て好適となる。耐火レンガ31の上下にの双方に傾斜面
342及び343をそれぞれ形成することにより、耐火
レンガ31の上下面32及び33のいずれを上下に用い
てもよいためである。耐火レンガ31側面の吊り下げ治
具用加工は、吊り下げ治具がセットできればよく特に制
限されない。上記のようにテーパ状に形成する以外に、
例えば、図6(H)、(I)及び図7(J)、(K)に
それぞれ正面図と側面図を示したように加工してもよ
い。図6は耐火レンガ31の側面34に凸部344を上
部に形成したものであり、図7は耐火レンガ31の側面
34に溝部345を上下に形成したものである。なお、
図6及び図7において、耐火レンガ31について、図5
に示したものと同一部所には同一の符号を付して説明を
省略する。またこれらの場合は、円筒状に耐火レンガ層
30を形成した後に、帯鋼36を巻く部所は凸部344
以外の部分または溝部345の部分に巻くことができ
る。
Further, the side surface 35 which is the inner peripheral surface of the refractory brick 31 forming the cylindrical refractory brick layer 30 is
And is formed so as to be perpendicular to the horizontal bottom surface 1 c of the vacuum chamber 1. On the other hand, the side surface 34 serving as the outer peripheral surface
When the cylindrical refractory brick layer 30 formed by the refractory bricks 31 is charged into the vacuum vessel, it is processed so that a hanging jig for hanging the crane as described later can be set in a predetermined manner. You. For example, as shown in FIG. 5 (G), the intermediate portion 341 is formed to be perpendicular to the facing surface 35 and to form inclined surfaces 342 and 343 tapered from the intermediate portion 341 toward the facing surface 35 in the vertical direction. I do. Since the intermediate portion 341 forms a vertical surface on the outer peripheral surface of the refractory brick layer 30, the intermediate portion 341 is suitable as a portion around which the steel strip 36 is wound. This is because by forming the inclined surfaces 342 and 343 on both the upper and lower sides of the refractory brick 31, respectively, any of the upper and lower surfaces 32 and 33 of the refractory brick 31 may be used up and down. The processing for the hanging jig on the side of the refractory brick 31 is not particularly limited as long as the hanging jig can be set. In addition to forming a tapered shape as described above,
For example, the processing may be performed as shown in FIGS. 6 (H) and 6 (I) and FIGS. 7 (J) and 7 (K) respectively showing a front view and a side view. FIG. 6 shows a refractory brick 31 with a convex portion 344 formed on the upper side, and FIG. 7 shows a refractory brick 31 with a groove 345 formed on the side surface 34 up and down. In addition,
6 and 7, the refractory brick 31 is shown in FIG.
The same reference numerals are given to the same parts as those shown in FIG. Also, in these cases, after forming the refractory brick layer 30 in a cylindrical shape, the portion where the steel strip 36 is wound is a convex portion 344.
Can be wound around the other portion or the groove 345.

【0019】次に、形成された各段の円筒状耐火レンガ
層30を、吊り下げ治具を用いて真空槽内に装入配設方
法について説明する。図8は、吊り下げ治具の部分的に
平面を示した底面図(L)及びそのM−M線断面図
(M)である。図8において、吊り下げ治具6は、円筒
形部材を周方向で4等分したような円弧状部材61、6
1、・・からなり、この円弧状部材61をワイヤ等の接
続部材62により接続して円筒形状に構成するものであ
る。また、各円筒状部材61の外周のほぼ中間部上部に
はフック63が取り付けられ、クレーンのワイヤ等で吊
り上げることができるようになっている。また、吊り下
げ部材6の円弧状部材61は、円弧内周径が下方に向か
って減少するようにテーパを持たせた傾斜内周面に形成
する。この円弧状部材61の傾斜面は、前記した耐火レ
ンガ31の外周面となる側面34の上下部の傾斜面34
2、343に対応して支持できるように形成する。これ
により、円筒状に形成された耐火レンガ層30の外周側
面の下部傾斜面343に、吊り下げ治具6の円弧状部材
61を所定にセットして、耐火レンガ層30を吊り上げ
ることができる。また、吊り下げ治具6は、4つの円弧
状部材61と接続部材62により構成することにより、
各段の耐火レンガ層30の外周部を取り巻いてセットす
ることができる。
Next, a method of loading and disposing the formed cylindrical refractory brick layers 30 in the respective stages in a vacuum chamber using a hanging jig will be described. FIG. 8: is the bottom view (L) which showed the plane partly of the hanging jig, and its MM sectional drawing (M). In FIG. 8, the hanging jig 6 is an arc-shaped member 61, 6 obtained by dividing a cylindrical member into four equal parts in the circumferential direction.
This arc-shaped member 61 is connected by a connecting member 62 such as a wire to form a cylindrical shape. A hook 63 is attached to the upper part of the outer periphery of each cylindrical member 61 at a substantially middle portion thereof, so that the cylindrical member 61 can be lifted by a crane wire or the like. The arc-shaped member 61 of the suspending member 6 is formed on an inclined inner peripheral surface that is tapered so that the inner diameter of the arc decreases downward. The inclined surface of the arc-shaped member 61 corresponds to the upper and lower inclined surfaces 34 of the side surface 34 which is the outer peripheral surface of the refractory brick 31 described above.
It is formed so that it can support corresponding to 2,343. Thereby, the arc-shaped member 61 of the hanging jig 6 can be set on the lower inclined surface 343 on the outer peripheral side surface of the refractory brick layer 30 formed in a cylindrical shape, and the refractory brick layer 30 can be lifted. In addition, the hanging jig 6 includes four arc-shaped members 61 and a connecting member 62,
It can be set by surrounding the outer periphery of the refractory brick layer 30 in each step.

【0020】上記のように円筒状耐火レンガ層30に吊
り下げ治具6をセットして、図9に示したようにクレー
ンCからのワイヤWを吊り下げ治具6のフック63に掛
止して、耐火レンガ層30は吊り下げ治具6により支持
され吊り上げられ、真空槽1の内部に移動して、既に補
修された水平状態1cの底面上に装入配設することがで
きる。耐火レンガ層30は、真空槽1とほぼ同心円状に
設置する。真空槽1内での脱ガス処理が円滑に行われる
ためである。耐火レンガ層30の配設終了後、吊り下げ
治具6を取り外して一段目の耐火レンガ層30の真空槽
1内への配設が完了する。
The hanging jig 6 is set on the cylindrical refractory brick layer 30 as described above, and the wire W from the crane C is hooked on the hook 63 of the hanging jig 6 as shown in FIG. Thus, the refractory brick layer 30 is supported and lifted by the hanging jig 6, moved to the inside of the vacuum tank 1, and can be placed on the bottom surface of the already repaired horizontal state 1c. The refractory brick layer 30 is installed substantially concentrically with the vacuum chamber 1. This is because the degassing process in the vacuum chamber 1 is performed smoothly. After disposing the refractory brick layer 30, the hanging jig 6 is removed, and the disposition of the first refractory brick layer 30 in the vacuum chamber 1 is completed.

【0021】次に、上記と同様にして、2段目、3段目
となる耐火レンガ層30を順次吊り下げ治具6により支
持してクレーンCにより吊り上げて、真空槽1内部に移
動し、上記のように配設した1段目の耐火レンガ層30
の上面32と切欠き部321上に、2段目の耐火レンガ
層30の下面33と切欠き部331とを嵌合させるよう
にし、2段目の耐火レンガ層30がずれないように積み
上げる。同様に、3段目の耐火レンガ層30を2段目の
耐火レンガ層30上に積み上げる。このようにして前記
図6に示したように、3段に分割された耐火レンガ層の
補修側壁3が形成される。最後に、補修側壁3と内張り
材2の損傷側壁Yとの間に生じた間隙に不定形耐火物4
を流し込み、図1及び図2に示したような状態の補修側
壁を有するRH真空脱ガス炉を得ることができる。
Next, in the same manner as described above, the second and third refractory brick layers 30 are successively supported by the hanging jig 6 and lifted by the crane C, and moved into the vacuum chamber 1. First refractory brick layer 30 arranged as above
The lower surface 33 of the second refractory brick layer 30 and the notch portion 331 are fitted on the upper surface 32 and the notch portion 321 of the second layer, and the second refractory brick layer 30 is stacked so as not to shift. Similarly, the third refractory brick layer 30 is stacked on the second refractory brick layer 30. Thus, as shown in FIG. 6, the repair side wall 3 of the refractory brick layer divided into three steps is formed. Finally, the gap between the repair side wall 3 and the damaged side wall Y of the lining material 2 is filled with the irregular refractory 4.
And an RH vacuum degassing furnace having a repair side wall in a state as shown in FIGS. 1 and 2 can be obtained.

【0022】上記したような本発明の補修方法を採用し
て真空炉内に形成した補修側壁は、例えばマグネシア・
クロム質レンガ等の耐火レンガが、真空槽内周面となる
ため、溶鋼の脱ガス処理で比較的長期の耐用を確保する
ことができる。なお、上記実施例においては、耐火レン
ガ層を3段積み重ねたもので説明したが、溶損部が真空
槽の内張り上部まで至っている場合や、下部のみである
場合には、必要に応じて積み上げる耐火レンガ層の数を
適宜選択することができる。また、耐火レンガ層を形成
する場合、金属製円筒体を各耐火レンガ層の高さに合わ
せて同様に多段に用いたが、例えば、耐火レンガ層数段
分または炉全高の高さにして、その高さの段数の耐火レ
ンガ層を形成して、真空槽に装入してもよい。これら
は、用いるクレーン能力等の補修作業条件に併せて適宜
選択することができる。更に、上記実施例は、RH真空
脱ガス炉内の全周側壁を金属製円筒体を用いて補修する
ものであるが、金属製円筒体を用いることなく耐火レン
ガ層のみを同様に形成することもできる。上下方向の部
分補修は、上記のように耐火レンガ層の段数を適宜選択
すれば全周側壁の補修と同様に行い、必要に応じて炉側
壁に沿った耐火レンガ層の上下のいずれか又は双方に連
続させ被補修側壁の上下端部又は両端部に連結するよう
に耐火レンガを連続配設して行い、脱ガス処理時に溶鋼
と不定形耐火物とが接触しないようにすることができ
る。これら部分補修においても耐久性に優れる補修側壁
を形成することができる。なお、実施例においては金属
製支持体が円筒状の場合について記してあるが多角筒状
の支持体であっても同様の効果が得られるものである。
The repair side wall formed in the vacuum furnace by employing the repair method of the present invention as described above is made of, for example, magnesia.
Since refractory bricks such as chrome bricks are used as the inner peripheral surface of the vacuum chamber, a relatively long-term durability can be secured by degassing the molten steel. In the above embodiment, the fire-resistant brick layer is described as being stacked in three layers. However, when the erosion part reaches the upper part of the lining of the vacuum chamber or when only the lower part is provided, the refractory brick layer is stacked as necessary. The number of refractory brick layers can be appropriately selected. In addition, when forming the refractory brick layer, the metal cylindrical body was similarly used in multiple stages according to the height of each refractory brick layer, for example, to the height of several refractory brick layers or the height of the furnace, The refractory brick layer of the number of steps of the height may be formed and charged in the vacuum chamber. These can be appropriately selected according to repair work conditions such as a crane capacity to be used. Further, in the above embodiment, the entire peripheral side wall in the RH vacuum degassing furnace is repaired by using a metal cylindrical body, but only the refractory brick layer is similarly formed without using the metal cylindrical body. Can also. The partial repair in the vertical direction is performed in the same manner as the repair of the entire peripheral side wall if the number of steps of the refractory brick layer is appropriately selected as described above, and if necessary, one or both of the upper and lower sides of the refractory brick layer along the furnace side wall And the refractory bricks are continuously arranged so as to be connected to the upper and lower ends or both ends of the repaired side wall, so that the molten steel and the irregular refractory can be prevented from coming into contact with each other during the degassing process. Also in these partial repairs, repair sidewalls having excellent durability can be formed. In the embodiment, the case where the metal support is cylindrical is described, but the same effect can be obtained even if the support is a polygonal cylindrical shape.

【0023】[0023]

【発明の効果】本発明の補修側壁は、炉内側壁に対応さ
せ耐火レンガで形成することから、従来の不定形耐火物
が露出する補修壁と異なり、損傷側壁の溶損が進行する
こともなく耐用期間が向上する。また、耐火レンガ層使
用中に不定形耐火物が十分に受熱し、焼結するため、耐
火レンガ層損耗後の不定形耐火物も安定した耐用が得ら
れる。すなわち、従来の不定形耐火物が露出する補修壁
では、実質的に損耗速度が4mm/ch(charge) 程度
であったが、本発明の耐火レンガと不定形耐火物からな
る補修壁では実質的に損耗速度が1.8mm/ch に
低減した。更に、補修方法も、炉内に配設する耐火レン
ガ層を多段に分割して形成、配置できることから作業条
件に応じて適宜選択でき、簡便であり、作業性も向上す
る。炉内内張りの解体、張替え法に比し、補修時間が従
来は7時間かかったものが、5時間ですみ、かつ使用前
の乾燥も、従来は48時間かかったものが20時間です
むなど著しく短縮でき、コストの削減も図ることがで
き、耐久性も張替え改修に比較すれば短いものの、従来
の補修に比較すれば75ch から166ch まで延命
でき著しく向上できるものである。
Since the repair side wall of the present invention is formed of refractory bricks corresponding to the inner wall of the furnace, unlike the repair wall in which the conventional irregular-shaped refractory is exposed, erosion of the damaged side wall may progress. And the service life is improved. In addition, since the amorphous refractory receives sufficient heat and sinters during use of the refractory brick layer, stable durability of the irregular refractory after the refractory brick layer is worn can be obtained. In other words, the wear rate of the conventional repair wall where the amorphous refractory is exposed is substantially 4 mm / ch (charge), but the repair wall composed of the refractory brick of the present invention and the amorphous refractory substantially has the wear rate. The wear rate was reduced to 1.8 mm / ch. Further, the repair method can be appropriately selected according to the working condition because the refractory brick layer provided in the furnace can be formed and arranged in multiple stages, which is simple, and the workability is improved. Compared to the dismantling and relining methods of furnace lining, repair time was 7 hours in the past, but 5 hours, and drying before use was 48 hours in the past, 20 hours in the past. Although it can be shortened, the cost can be reduced, and the durability is shorter than the rehabilitation repair, but the life can be extended from 75 ch to 166 ch as compared with the conventional repair, so that it can be significantly improved.

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

【図1】本発明の一実施例でRH真空脱ガス炉の真空槽
を補修して補修側壁を形成した炉の平面図。
FIG. 1 is a plan view of a furnace in which a repair side wall is formed by repairing a vacuum chamber of an RH vacuum degassing furnace according to one embodiment of the present invention.

【図2】図1のII−II線断面図FIG. 2 is a sectional view taken along line II-II of FIG.

【図3】本発明の実施例に用いた金属製円筒体の平面図
(A)及び側面図(B)
FIG. 3 is a plan view (A) and a side view (B) of a metal cylindrical body used in an embodiment of the present invention.

【図4】本発明の実施例の耐火レンガ層の平面図(C)
及び一部断面を切欠き示した正面図(D)
FIG. 4 is a plan view (C) of the refractory brick layer according to the embodiment of the present invention.
And a front view (D) showing a partial cutaway view.

【図5】本発明の実施例に用いた耐火レンガの平面図
(E)、正面図(F)及び側面図(G)
FIG. 5 is a plan view (E), a front view (F), and a side view (G) of the refractory brick used in the embodiment of the present invention.

【図6】本発明で用いる他の耐火レンガの正面図(H)
及び側面図(I)
FIG. 6 is a front view of another refractory brick used in the present invention (H).
And side view (I)

【図7】本発明で用いる他の耐火レンガの正面図(J)
及び側面図(K)
FIG. 7 is a front view (J) of another refractory brick used in the present invention.
And side view (K)

【図8】本発明の実施例で用いた部分的に平面を示した
底面図(L)及びそのM−M線断面図(M)
FIG. 8 is a bottom view (L) partially showing a plane used in the embodiment of the present invention and a sectional view taken along the line MM (M) of FIG.

【図9】吊り下げ治具により本発明の耐火レンガ層を吊
り上げた部分説明図
FIG. 9 is a partial explanatory view in which the refractory brick layer of the present invention is lifted by a hanging jig.

【図10】RH真空脱ガス炉の模式的断面説明図FIG. 10 is a schematic sectional explanatory view of an RH vacuum degassing furnace.

【符号の説明】[Explanation of symbols]

C クレーン W ワイヤ X 真空槽内張り材の初期状態 Y 真空槽内張り材の損傷状態 1 真空槽 1a 鉄皮 1b 耐火レンガ 1c 真空槽の水平底面 2 内張り材(補修域の側壁/被補修側壁) 3 補修側壁 30 耐火レンガ層 31 耐火レンガ 36 帯鋼 4、4’ 不定形耐火物 5 金属製円筒体 51 金属製板 52、53、52’、53’ 補強部材 6 吊り下げ治具 100 真空槽 101 上昇管 102 下降管 110 取鍋 120 ガス吹込み管 130 溶鋼 140 環流管 150 上部槽 160 下部槽 170 天蓋 C Crane W Wire X Initial condition of vacuum tank lining material Y Damage condition of vacuum tank lining material 1 Vacuum tank 1a Iron shell 1b Firebrick 1c Horizontal bottom surface of vacuum tank 2 Lining material (repair area side wall / repair side wall) 3 Repair Side wall 30 Refractory brick layer 31 Refractory brick 36 Strip steel 4, 4 'Irregular refractory 5 Metal cylinder 51 Metal plate 52, 53, 52', 53 'Reinforcing member 6 Suspension jig 100 Vacuum tank 101 Rise pipe 102 Downcomer 110 Ladle 120 Gas injection pipe 130 Molten steel 140 Recirculation pipe 150 Upper tank 160 Lower tank 170 Canopy

───────────────────────────────────────────────────── フロントページの続き (72)発明者 木島 正彦 愛知県刈谷市小垣江町南藤1番地 東芝セ ラミックス株式会社刈谷製造所内 (72)発明者 山形 俊明 茨城県鹿嶋市大字光3番地 住友金属工業 株式会社鹿島製鉄所内 (72)発明者 浦 宏一 茨城県鹿嶋市大字光3番地 住友金属工業 株式会社鹿島製鉄所内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiko Kijima 1 Minami Fuji, Ogakie-cho, Kariya-shi, Aichi Prefecture Toshiba Ceramics Co., Ltd. Kariya Manufacturing Co., Ltd. Kashima Steel Works, Ltd. (72) Inventor Koichi Ura 3, Oaza Hikari, Kashima City, Ibaraki Prefecture Sumitomo Metal Industries Kashima Works, Ltd.

Claims (11)

【特許請求の範囲】[Claims] 【請求項1】 RH真空脱ガス炉の内張り補修側壁であ
って、補修域の周方向に耐火レンガ層を形成し、該耐火
レンガ層は不定形耐火物が充填された間隙を介して該補
修域の側壁に接続されており、炉の再使用前には金属製
支持体が耐火レンガを支持しており、再使用時には金属
製支持体が溶損し、その後、溶鋼と接する部位が耐火レ
ンガで形成されてなることを特徴とするRH真空脱ガス
炉補修側壁。
1. A lining repair side wall of an RH vacuum degassing furnace, wherein a refractory brick layer is formed in a circumferential direction of a repair area, and the refractory brick layer is repaired through a gap filled with an irregular refractory. Before the furnace is reused, the metal support supports the refractory brick, and when reused, the metal support melts down, and then the part in contact with the molten steel is refractory brick. A repair side wall for an RH vacuum degassing furnace, which is formed.
【請求項2】 RH真空脱ガス炉の下部槽の内張り補修
側壁であって、補修域の側壁に沿って一周する2以上の
多段のマグクロ質の耐火レンガ層が、補修域の側壁と空
隙を有して同心の円筒状あるいは多角筒状に立設し、該
空隙が不定形耐火物で充填されてなることを特徴とする
RH真空脱ガス炉補修側壁。
2. A repair side wall of a lower tank of an RH vacuum degassing furnace, wherein at least two or more multi-stage refractory brick layers surrounding the repair area have a gap with the side wall of the repair area. An RH vacuum degassing furnace repair side wall having a concentric cylindrical shape or a polygonal cylindrical shape, wherein the gap is filled with an irregular refractory.
【請求項3】 RH真空脱ガス炉の内張り補修方法であ
り、補修する損傷部位が炉内周側壁であり、被補修周側
壁と空間部を介して同心状に耐火レンガ層を2以上の多
段に筒状に立設し、該被補修周側壁と該レンガ層との間
の空間部に不定形耐火物を充填することを特徴とするR
H真空脱ガス炉の補修方法。
3. A method of repairing a lining of an RH vacuum degassing furnace, wherein a damaged portion to be repaired is a furnace inner peripheral side wall, and two or more refractory brick layers are formed concentrically with the repaired peripheral side wall through a space. A space between the repaired peripheral side wall and the brick layer is filled with an irregular refractory.
Repair method for H vacuum degassing furnace.
【請求項4】 RH真空脱ガス炉の内張り補修方法であ
り、補修する損傷部位が炉内の全周域で高さ方向の一部
であり、被補修周側壁と空間部を介して同心状に耐火レ
ンガ層を配設し、且つ、該耐火レンガ層の上下部の一方
または双方を連続して対応する該被補修周側壁の上下端
部に連結し、該被補修周側壁と該耐火レンガ層との空間
部に不定形耐火物を充填することを特徴とするRH真空
脱ガス炉の補修方法。
4. A method of repairing a lining of an RH vacuum degassing furnace, wherein a damaged portion to be repaired is a part of a height direction in an entire circumferential area of the furnace, and is concentric with a repaired peripheral side wall via a space. A refractory brick layer, and one or both of the upper and lower portions of the refractory brick layer are continuously connected to the corresponding upper and lower ends of the repaired peripheral side wall, and the repaired peripheral side wall and the refractory brick are connected. A method for repairing an RH vacuum degassing furnace, characterized by filling a space with a layer with an amorphous refractory.
【請求項5】 前記補修する損傷部位が、RH真空脱ガ
ス炉の下部槽の内張りである請求項3または4記載のR
H真空脱ガス炉の補修方法。
5. The R according to claim 3, wherein the damaged portion to be repaired is a lining of a lower tank of an RH vacuum degassing furnace.
Repair method for H vacuum degassing furnace.
【請求項6】 前記耐火レンガ層が、その内周面を金属
製支持体により支持されている請求項3〜5のいずれか
記載のRH真空脱ガス炉の補修方法。
6. The repair method for an RH vacuum degassing furnace according to claim 3, wherein the inner peripheral surface of the refractory brick layer is supported by a metal support.
【請求項7】 前記耐火レンガ層が、各段毎に予め前記
金属製支持体と共に、前記被補修周側壁と対応する形状
に合わせて形成されて、炉内に装入配設される請求項6
記載のRH真空脱ガス炉の補修方法。
7. The refractory brick layer is formed together with the metal support in advance in each step so as to conform to the shape corresponding to the repaired peripheral side wall, and is disposed in the furnace. 6
The method for repairing the RH vacuum degassing furnace described above.
【請求項8】 前記耐火レンガ層の各段が嵌合部を有し
て形成されると共に、該嵌合部を介して嵌合されて多段
に配設される請求項3〜7のいずれか記載のRH真空脱
ガス炉の補修方法。
8. The refractory brick layer according to claim 3, wherein each step of the refractory brick layer is formed to have a fitting portion, and is fitted in a multi-stage manner through the fitting portion. The method for repairing the RH vacuum degassing furnace described above.
【請求項9】 前記金属製支持体が、円筒状あるいは多
角筒状である請求項6または7記載のRH真空脱ガス炉
の補修方法。
9. The repair method for an RH vacuum degassing furnace according to claim 6, wherein the metal support is cylindrical or polygonal cylindrical.
【請求項10】 前記耐火レンガ層を形成する耐火レン
ガが、マグクロ質レンガである請求項3〜9のいずれか
記載のRH真空脱ガス炉の補修方法。
10. The method for repairing an RH vacuum degassing furnace according to claim 3, wherein the refractory brick forming the refractory brick layer is a magcro brick.
【請求項11】 RH真空脱ガス炉の下部槽の内張り補
修方法であり、(1)炉内損傷を検査する検査工程、
(2)炉底部の損傷箇所を水平に補修する底面補修工
程、(3)円筒状あるいは多角筒状の金属製支持体外周
面に密接して配列して形成した耐火レンガ層を被補修側
壁と対面するように間隙を介して装入配設する耐火レン
ガ層装入工程、(4)耐火レンガ層装入工程で形成され
た間隙に不定形耐火物を充填する工程を有することを特
徴とするRH真空脱ガス炉の補修方法。
11. A method for repairing a lining of a lower tank of an RH vacuum degassing furnace, wherein (1) an inspection step for inspecting damage inside the furnace;
(2) a bottom surface repair step of horizontally repairing a damaged portion of the furnace bottom, and (3) a refractory brick layer formed in close contact with the outer peripheral surface of a cylindrical or polygonal cylindrical metal support and the side wall to be repaired. A refractory brick layer charging step of charging and disposing the gap through the gap so as to face each other, and (4) a step of filling the gap formed in the refractory brick layer charging step with an amorphous refractory. Repair method for RH vacuum degassing furnace.
JP9974797A 1997-04-01 1997-04-01 Repaired side wall of rh vacuum degassing furnace and method for repairing rh vacuum degassing furnace Pending JPH10280030A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9974797A JPH10280030A (en) 1997-04-01 1997-04-01 Repaired side wall of rh vacuum degassing furnace and method for repairing rh vacuum degassing furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9974797A JPH10280030A (en) 1997-04-01 1997-04-01 Repaired side wall of rh vacuum degassing furnace and method for repairing rh vacuum degassing furnace

Publications (1)

Publication Number Publication Date
JPH10280030A true JPH10280030A (en) 1998-10-20

Family

ID=14255602

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JP9974797A Pending JPH10280030A (en) 1997-04-01 1997-04-01 Repaired side wall of rh vacuum degassing furnace and method for repairing rh vacuum degassing furnace

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100885208B1 (en) * 2002-07-03 2009-02-24 주식회사 포스코 Device for inserting lime for electric furnace
JP2020050902A (en) * 2018-09-26 2020-04-02 Jfeスチール株式会社 Charging chute made of refractory for rh vacuum degasser
CN115354118A (en) * 2022-09-06 2022-11-18 中冶南方工程技术有限公司 RH vacuum refining device and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100885208B1 (en) * 2002-07-03 2009-02-24 주식회사 포스코 Device for inserting lime for electric furnace
JP2020050902A (en) * 2018-09-26 2020-04-02 Jfeスチール株式会社 Charging chute made of refractory for rh vacuum degasser
CN115354118A (en) * 2022-09-06 2022-11-18 中冶南方工程技术有限公司 RH vacuum refining device and method
CN115354118B (en) * 2022-09-06 2023-10-27 中冶南方工程技术有限公司 RH vacuum refining device and method

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