JPS61217517A - Method for repairing inside wall of converter - Google Patents
Method for repairing inside wall of converterInfo
- Publication number
- JPS61217517A JPS61217517A JP6032885A JP6032885A JPS61217517A JP S61217517 A JPS61217517 A JP S61217517A JP 6032885 A JP6032885 A JP 6032885A JP 6032885 A JP6032885 A JP 6032885A JP S61217517 A JPS61217517 A JP S61217517A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- converter
- suction
- wall
- burner
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
- F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
- F27D1/1642—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus
- F27D1/1647—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus the projected materials being partly melted, e.g. by exothermic reactions of metals (Al, Si) with oxygen
- F27D1/1652—Flame guniting; Use of a fuel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、転炉内壁の補修方法および装置、特に出鋼直
後に炉内に残留する溶融スラグを吸引して炉内壁に吹付
けることによる転炉内壁の補修方法および装置に関する
。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method and apparatus for repairing the inner wall of a converter, and in particular a repair method and apparatus for repairing the inner wall of a converter, in particular a method and apparatus for repairing the inner wall of a converter by suctioning molten slag remaining in the furnace immediately after tapping and spraying the molten slag onto the inner wall of the furnace. The present invention relates to a method and apparatus for repairing the inner wall of a converter.
（従来の技術）
転炉は操業の継続とともに炉内の耐火物煉瓦のＦＭ傷が
進行し、定期的に稼働を休止して煉瓦の交換を行うが、
転炉操業能率を向上さセるには転炉寿命（煉瓦の寿命）
をできるだけ延ばして煉瓦交換を少なくする必要がある
。(Prior art) FM damage in the refractory bricks inside the converter progresses as the converter continues to operate, and the operation must be periodically stopped to replace the bricks.
To improve converter operating efficiency, converter life (life of bricks)
It is necessary to extend this period as much as possible and reduce the need for brick replacement.
この目的で従来より実施されているのは、転炉吹ＩＩＩ
にドロマイト、マグネシアなどのＭｇＯ含有成分を多く
添加して生成スラグ成分が炉内壁の耐火物と類似するよ
うにスラグ成分調整を行い、耐火物の溶損を抑える方法
であり、これにより転炉寿命の飛曜的な延長が達成され
、大きな効果を上げている（例、特公昭４２−１２３２
７号、同４８−８６９１号および５８−９１２３号参照
）。Conventionally, converter blowing III is used for this purpose.
This method involves adding a large amount of MgO-containing components such as dolomite and magnesia to the converter to adjust the slag composition so that the slag composition is similar to the refractory material on the inner wall of the furnace, thereby suppressing melting loss of the refractory material, thereby extending the converter life. A dramatic extension of the period was achieved, and it has had great effects (for example, the
No. 7, No. 48-8691 and No. 58-9123).
しかし、かかるスラグ成分調整によっても、転炉内の苛
酷な操業条件のために炉内壁耐火物の局部的な損耗は避
けられず、したがって、転炉の一層の延命化を図るには
、転炉操業中または操業の合間に煉瓦の損耗部分を補修
し、あるいは炉内壁に保護層を形成して煉瓦を保護する
のが有効と考えられ、これまでにも各種の方法が提案さ
れている。これらの方法は、大別するとスラグコーティ
ング法と吹付法とに分かれる。However, even with such adjustment of slag composition, local wear of the refractories inside the furnace cannot be avoided due to the harsh operating conditions inside the converter. Therefore, in order to further extend the life of the converter, It is thought to be effective to repair worn parts of the bricks during or between operations, or to protect the bricks by forming a protective layer on the inner wall of the furnace, and various methods have been proposed so far. These methods can be broadly classified into slag coating methods and spraying methods.
スラグコーティング法：
出鋼後に転炉内にスラグを残し、これにＭｇＯ含有成分
を添加してＭｇＯが富化されたスラグ組成に調整した後
、炉体を揺動させて該スラグを炉内壁面にコーティング
する方法である（例、特公昭５６−１２２９３号参照）
。これは、内壁の耐火物成分のうち特にＭｇＯの吹錬中
の溶出が激しいことから、ＭｇＯ濃度を高めた保護層を
炉内表面に形成して内壁の溶損を抑えること自衛したも
のである。しかし、このスラグコーティング法では、転
炉の揺動方向への保護層の形成は十分に可能であるが、
転炉揺動の支点であるトラニオン側への保護層の形成が
行えず、このトラニオン側で炉内の損耗が特に大きいこ
とから、この方法による転炉延命効果は小さかった。Slag coating method: After tapping, slag is left in the converter, and after adding MgO-containing components to adjust the slag composition to be enriched with MgO, the furnace body is rocked to coat the slag on the inner wall of the furnace. (For example, see Japanese Patent Publication No. 56-12293)
. This is because MgO, among the refractory components of the inner wall, is particularly leached out during blowing, so a protective layer with a high concentration of MgO is formed on the inner surface of the furnace to prevent melting damage to the inner wall. . However, with this slag coating method, it is possible to form a protective layer in the swinging direction of the converter;
This method had little effect on prolonging the life of the converter because it was not possible to form a protective layer on the trunnion side, which is the fulcrum of the converter swing, and the wear and tear inside the furnace was particularly large on this trunnion side.
かかるスラグコーティング法の欠点を補うべく、特公昭
５６−１２２９３号に記載の方法では吹錬末期に軽焼ド
ロマイトの投入によるスブラソシェを利用してトラニオ
ン側へのスラグコーティングを図っている。また、特開
昭５７−１６１１１号には、転炉揺動によるスラグコー
ティング時に炉底羽口から気流を吹込み、スラグを飛散
させてトラニオン側へも保護層を付着させることが提案
されている。しかし、これらの方法はいずれも局所的な
損耗部への付着量を制御することができず、また特に後
者では炉壁への付着性にも疑問がある。In order to compensate for the drawbacks of such a slag coating method, the method described in Japanese Patent Publication No. 12293/1983 attempts to coat the trunnion side with slag by using a submerging process by adding lightly burnt dolomite at the final stage of blowing. Furthermore, JP-A-57-16111 proposes that during slag coating by rocking the converter, airflow is blown from the bottom tuyere to scatter the slag and deposit a protective layer on the trunnion side as well. . However, none of these methods can control the amount of adhesion to locally worn parts, and in the latter case in particular, there are doubts about the adhesion to the furnace wall.
吹付補修法：
吹付補修法には、耐火物の粉末を吹付ける方式と、スラ
グを吹付ける方式とがある。Spraying repair method: There are two methods of spraying repair: one is to spray refractory powder, and the other is to spray slag.
耐火物吹付法では、不定形耐火物の微粉末を湿式または
乾式で炉内壁の損耗部分に吹付けて付着させる方法であ
り、この方法では不定形耐火物の炉壁への付着力の確保
が問題となる。炉壁への付着力を得るために、湿式法で
は微粉状の耐火物からなる補修材に水分や結合剤を添加
してスラリーに近い状態とし、出鋼後の転炉内壁に吹付
けるのが普通であるが、水分の存在により吹付個所近傍
が急冷され、熱劣化による耐火物のスポーリングが起こ
る上、形成された補修材層の耐用性も十分でない。In the refractory spraying method, fine powder of monolithic refractories is sprayed wet or dry onto the worn parts of the furnace inner wall, and this method ensures the adhesion of monolithic refractories to the furnace wall. It becomes a problem. In order to obtain adhesion to the furnace wall, in the wet method, water and a binder are added to the repair material made of finely powdered refractory to create a state similar to slurry, which is then sprayed onto the inner wall of the converter after steel is tapped. Although it is normal, the presence of moisture rapidly cools the vicinity of the sprayed area, causing spalling of the refractory due to thermal deterioration, and the formed repair material layer does not have sufficient durability.
乾式吹付法は、補修材を溶融もしくは半溶融状態で吹付
けて炉壁に付着させる方法であり、たとえば特公昭５７
−５６６６８号には火炎溶射吹付法が、特開昭５２−１
１０２０３号には補修材に重油を混合して吹付け、壁面
の保有熱により重油を着火させ耐火物を焼結させる方法
が、また特開昭５７−１６６４８９号には火炎噴射によ
る予熱溶射を通常の補ｆホ材湿式吹付けと併用する方法
がそれぞれ記載されている。The dry spraying method is a method in which the repair material is sprayed in a molten or semi-molten state and adhered to the furnace wall.
-56668 describes the flame spraying method, JP-A-52-1
No. 10203 describes a method in which heavy oil is mixed with a repair material and sprayed, and the heat retained in the wall surface ignites the heavy oil to sinter the refractory, and JP-A-57-166489 describes a method in which preheating thermal spraying using flame injection is normally used. Methods for use in conjunction with wet spraying of supplementary materials are described.
しかし、これらはいずれも使用する補修材、すなわち耐
火物材料が高価である上、吹付装置と吹付作業にも費用
がかかるので、補修効果に比べて費用が高くなる欠点が
あった。However, in all of these methods, the repair material used, that is, the refractory material, is expensive, and the spraying equipment and spraying work are also expensive, so they have the disadvantage that the cost is higher than the repair effect.
特開昭５２−５２８１３号には、転炉吹錬中に炉内スラ
グが発泡化して壁面に押しつけられ盛り上がる現象を利
用し、操業中にランスに添って炉芯に装入した吹付ノズ
ルからドロマイトなどの補修材を吹付け、前記発泡スラ
グを介して補修材を付着させる方法が開示されている。Japanese Patent Application Laid-open No. 52-52813 discloses that dolomite is ejected from a blowing nozzle inserted into the furnace core along with a lance during operation by utilizing the phenomenon in which slag in the furnace foams during converter blowing and bulges when pressed against the wall surface. A method of spraying a repair material such as the above and adhering the repair material through the foamed slag has been disclosed.
これは、補修材をスラグと反応させて粘着性を高め、火
炎を用いずに炉壁に容易に付着させること意図した方法
であるが、操業中の吹付ではランス構造が複雑となり、
また操業中の炉内の高温および高速気流による影響も大
で、逆に煉瓦の侵食が起こる恐れも出てくる。This is a method intended to make the repair material react with slag to increase its adhesion and easily adhere to the furnace wall without using flames, but the lance structure becomes complicated when spraying during operation.
In addition, the high temperature and high-speed airflow inside the furnace during operation have a significant effect, and there is a risk that the bricks will be eroded.
転炉内壁の補修を安価に行うために、出鋼中または出鋼
後に転炉内の溶融スラグを炉壁に吹付けることにより、
新品購入した補修材を用いずに吹付補修するスラグ吹付
法も提案されている。In order to repair the inner wall of the converter at low cost, the molten slag inside the converter is sprayed onto the furnace wall during or after tapping the steel.
A slag spraying method has also been proposed for spraying repairs without using newly purchased repair materials.
たとえば、実開昭５７−４８２５０号には、ランスをス
ラグ中に浸漬してスラグを吹上げ、炉壁に付着させる炉
壁補修装置が開示されているが、この装置による吹付で
は、炉底からの気流吹込によるスラグ飛散を利用した前
述の特開昭５７−１６１１１号の方法と大差なく、やは
りスラグ付着量制御や炉壁への付着性に問題が残る。For example, Japanese Utility Model Application Publication No. 57-48250 discloses a furnace wall repair device in which a lance is immersed in slag and the slag is blown up and adhered to the furnace wall. This method is not much different from the method of JP-A-57-16111 mentioned above, which utilizes slag scattering by air blowing, but there still remain problems in controlling the amount of slag adhesion and adhesion to the furnace wall.
また、特開昭５３−１０６６０６号には、転炉内スラグ
を炉壁の補修面に吹付けて付着させることが提案されて
いる。この吹付に用いる具体的装置は開示されていない
が、キャリアガスによるサイフオン、エジェクター効果
を利用してスラグを吸引し、炉壁面に吹付けることが記
載されている。しかし、この方法では、溶融スラグが吸
引中にキャリアガスにより冷却、凝固され、凝固状態で
炉内壁面に吹付けられることになるので、炉壁へのスラ
グの付着性に疑問がある。Furthermore, Japanese Patent Laid-Open No. 106606/1983 proposes spraying and adhering the slag in the converter to the repaired surface of the furnace wall. Although the specific device used for this spraying is not disclosed, it is described that the slag is suctioned using the siphon and ejector effects of the carrier gas and sprayed onto the furnace wall surface. However, in this method, the molten slag is cooled and solidified by the carrier gas during suction and is sprayed onto the furnace inner wall surface in a solidified state, so there are doubts about the adhesion of the slag to the furnace wall.
（発明が解決しようとする問題点）
以上に説明したように、これまでに提案された方法には
それぞれ問題があり、実操業において現在実施されてい
るのは、従来からのスラグ成分調整のほかは、コストが
かかるが不定形耐火物の吹付補修法だけである。コスト
的には好ましいスラグ吹付法は、前述のように炉壁への
付着性の問題などから未だ実現には至っていない。(Problems to be solved by the invention) As explained above, each of the methods proposed so far has its own problems, and the methods currently being implemented in actual operation are in addition to the conventional slag component adjustment. Although it is costly, it is the only method for repairing monolithic refractories by spraying. The slag spraying method, which is preferable in terms of cost, has not yet been realized due to problems such as adhesion to the furnace wall as described above.
本発明は、炉壁保護効果を有する安価な転炉内スラグを
炉壁損耗部に高速度で吹付けて付着させることにより、
炉内壁に確実に保護層を形成させることのできるスラグ
吹付方式による転炉内壁の補修方法および装置を提供す
ることを目的とするものである。The present invention achieves this by spraying and adhering inexpensive in-converter slag, which has the effect of protecting the furnace wall, onto the damaged parts of the furnace wall at high speed.
It is an object of the present invention to provide a method and apparatus for repairing the inner wall of a converter using a slag spraying method, which can reliably form a protective layer on the inner wall of the furnace.
（問題点を解決するための手段）
上述した各種の転炉内壁補修方法のうち、特開昭５３−
１０６６０６号に記載のような転炉内のスラグの吹付を
利用した方法が、トラニオン側も含む任意の部位の局部
的な損耗個所の補修が可能ある上、コスト面でも有利で
あるので、最も有望な方法であると考えられる。(Means for solving the problem) Among the various converter inner wall repair methods mentioned above, the
The method using slag spraying inside the converter, as described in No. 106606, is the most promising method, as it is possible to repair locally worn parts of any part, including the trunnion side, and is also advantageous in terms of cost. This is considered to be a suitable method.
本発明者らは、先に特願昭５９−１６４６２９号におい
て、高速気流をエジェクター駆動源として、溶融スラグ
を吸引し、粒状で排出するエジェクター式の吸引排滓装
置を提案した。この装置により、上記特開昭５３−１０
６６０６号に記載の方法にしたがって、出鋼直後の転炉
内に残留する溶融スラグを吸引し、転炉壁面に粒状で吹
付けてみたが、吸引時には溶融状であったスラグもエジ
ェクター源の高速気流（常温窒素ガス使用）にぶつかっ
て凝固したためか、壁面に当たっても付着せず、はとん
どすべ゛て落下してしまった。温度を測定したところ、
吸引部の雰囲気は約８００〜１０００℃あるのに対し、
スラグ粒吐出側の装置先端部の温度は５００〜７００℃
まで低下しており、スラグは吐出の時点で凝固している
ことが十分に想像された。The present inventors previously proposed in Japanese Patent Application No. 59-164629 an ejector-type suction slag device that uses high-speed airflow as an ejector drive source to suck molten slag and discharge it in granular form. With this device, the above-mentioned Japanese Patent Application Laid-Open No. 53-10
According to the method described in No. 6606, the molten slag remaining in the converter immediately after tapping was suctioned and sprayed in granular form on the converter wall, but the slag, which was molten at the time of suction, was also blown by the high speed of the ejector source. Perhaps because it solidified when it hit the airflow (using room-temperature nitrogen gas), it did not stick even when it hit the wall, and most of it just fell off. When I measured the temperature,
While the atmosphere in the suction section is approximately 800 to 1000 degrees Celsius,
The temperature at the tip of the device on the slag particle discharge side is 500 to 700℃
It was fully assumed that the slag had solidified at the time of discharge.
この温度低下を解決すべく検討した結果、前記吸引装置
において、エジェクター駆動用の高速気流噴出ノズルに
代えて高速バーナを組み込み、燃焼させたところ、バー
ナから噴出気流が高速であればスラグの吸引、粒状化は
十分に達成され、しかも燃焼炎によりスラグ粒の冷却が
抑えられて、スラグ粒を溶融ないし半溶融状態で炉壁に
付着させることができるとの知見を得た。As a result of studying to solve this temperature drop, we installed a high-speed burner in place of the high-speed air jet nozzle for driving the ejector in the suction device and caused combustion. It has been found that granulation is sufficiently achieved, and cooling of the slag grains is suppressed by the combustion flame, so that the slag grains can be attached to the furnace wall in a molten or semi-molten state.
ここに、本発明は、駆動気流噴出用ノズルとして高速バ
ーナを組み込んだエジェクター式吸引装置を使用して、
前記バーナの燃焼を維持しながら転炉内溶融スラグを吸
引し、前記バーナの火炎により吸引スラグの冷却を防止
しつつ炉内耐火壁面に前記吸引スラグを吹付けて付着さ
せることを特徴とする、転炉内壁の補修方法である。Here, the present invention uses an ejector-type suction device incorporating a high-speed burner as a nozzle for ejecting a driving air flow,
The molten slag in the converter is sucked while maintaining combustion in the burner, and the suction slag is sprayed and adhered to the refractory wall surface in the furnace while preventing the suction slag from being cooled by the flame of the burner. This is a method of repairing the inner wall of a converter.
本発明は、その別の特徴によると、一端閉鎖管からなる
吐出管、この吐出管の閉鎖端面を貫通して軸方向に管内
に装入された、燃料ガス供給源および酸素含有ガス供給
源に接続されている高速バーナ、ならびに前記吐出管か
ら連通分岐した吸引管からなるエジェクター式吸引機に
より構成される、転炉内溶融スラグの吸引吹付により転
炉内壁を補修する転炉内壁補修装置である。According to another characteristic of the invention, the invention provides a discharge pipe consisting of a closed end pipe, a fuel gas supply source and an oxygen-containing gas supply source inserted into the pipe in the axial direction through the closed end face of the discharge pipe. This is a converter inner wall repair device that repairs the converter inner wall by suctioning and spraying molten slag in the converter, which is composed of a connected high-speed burner and an ejector-type suction machine consisting of a suction pipe that communicates and branches from the discharge pipe. .
（作用） 以下、本発明を添付図面を参照しながら詳述する。(effect) Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
第１図は、本発明に係る転炉内壁補修装置の１例を示す
略式断面図である。この装置の構造は、本発明者らが先
に出願した特願昭５９−１６４６２９号に記載の装置と
ほぼ同様である。FIG. 1 is a schematic sectional view showing an example of a converter inner wall repair device according to the present invention. The structure of this device is almost the same as the device described in Japanese Patent Application No. 164629/1983, which was previously filed by the present inventors.
簡単に説明すると、本発明に係る転炉内壁補修装置１は
、内部を高速駆動気体流が流れる一端閉鎖管からなる吐
出管２、この吐出管から連通・分岐した吸引管３、およ
び吐出管２の閉鎖端面を貫通して吐出管内に挿入された
高速バーナ４から構成される比較的簡単な構造のエジェ
クター式吸引機からな°る。吐出管および吸引管は適当
な口径の鋼管から製作できる。高速バーナ４は、通常の
ノズル型バーナと同様に、それぞれ燃料ガス供給源およ
び酸素含有ガス供給源に接続されている二重管構造のも
のでよく、バーナの先端は吸引管の延長上の範囲内に達
しているのが好ましい。Briefly, the converter inner wall repair device 1 according to the present invention includes a discharge pipe 2 having a closed end at one end through which a high-speed driven gas flow flows, a suction pipe 3 communicating and branching from the discharge pipe, and a discharge pipe 2. The ejector-type suction machine has a relatively simple structure and consists of a high-speed burner 4 inserted into the discharge pipe by penetrating the closed end face of the ejector-type suction machine. The discharge and suction pipes can be made from steel pipes of appropriate diameter. The high-speed burner 4 may be of double-tube construction, connected to a fuel gas supply source and an oxygen-containing gas supply source, respectively, like a normal nozzle-type burner, and the tip of the burner is an extension of the suction pipe. It is preferable that it reaches inward.
高速バーナ４からエジェクター駆動源として高速気流（
すなわち、燃料ガスと酸素含有ガス）を噴出させると、
吐出管２の内部に高速気体流が生じ、この気体流は吸引
管３内の空気を巻込んで吐出管の開口出口から噴出する
。この吸引管内空気の巻込みにより吸引管内に上昇気流
、すなわち吸引力が発生する。High-speed airflow (
In other words, when the fuel gas and oxygen-containing gas are ejected,
A high-speed gas flow is generated inside the discharge pipe 2, and this gas flow entrains the air in the suction pipe 3 and is ejected from the opening of the discharge pipe. This entrainment of air within the suction tube generates an upward air current, that is, suction force, within the suction tube.
かかる構成のエジェクター式吸引機を使用して、この吸
引機の高速バーナ４から燃料ガスおよび酸素含有ガスを
吸引に十分な高速度で噴出させながら吸引管３の先端部
を溶融スラグ５に近づけると、上記の吸引管内に生じた
吸引力によって溶融スラグが吸引され、吸引スラグは溶
融液滴状で吸引管内を上昇する。液滴状の溶融スラグは
吐出管２内に入ると、高速バーナ４から噴出する高速気
流にぶつかり、溶融スラグの持つ顕熱（吐出管到達時点
で１３００℃程度）により燃料ガスが着火し、バーナの
燃焼が始まる。吐出管内に入ったスラグ滴は、バーナか
らの火炎により冷却・凝固が防止されつつ、吐出管内で
バーナから噴出する高速気流により吹飛ばされ吐出管の
吹出し口から溶融ないし半溶融の粒状で噴射され、転炉
壁面６に衝突して壁面に付着し、保護Ｉ′ｉｉ７を形成
する。When an ejector-type suction machine having such a configuration is used and the tip of the suction pipe 3 is brought close to the molten slag 5 while ejecting fuel gas and oxygen-containing gas from the high-speed burner 4 of the suction machine at a high enough speed for suction, The molten slag is sucked by the suction force generated in the suction tube, and the suction slag rises in the form of molten droplets inside the suction tube. When the droplet-shaped molten slag enters the discharge pipe 2, it collides with the high-speed airflow ejected from the high-speed burner 4, and the fuel gas is ignited by the sensible heat of the molten slag (approximately 1300 degrees Celsius when it reaches the discharge pipe), causing the burner to ignite. begins to burn. The slag droplets that have entered the discharge pipe are prevented from cooling and solidifying by the flame from the burner, and are blown away by the high-speed airflow ejected from the burner within the discharge pipe, and are ejected in the form of molten or semi-molten particles from the outlet of the discharge pipe. , collide with the converter wall surface 6 and adhere to the wall surface, forming protection I'ii7.
高速バーナ４から噴出させる燃料ガスは、ＬＰＧ、ＬＮ
Ｇなどより供給されるプロパンガス、天然ガスなどの通
常の可燃性ガスでよく、たとえばプロパンの着火温度は
約４３０℃であり、吸引管内を上昇してきたスラグ滴の
顕熱で十分に着火するので、バーナの着火手段を特に設
ける必要はない。The fuel gas ejected from the high-speed burner 4 is LPG or LN.
Ordinary flammable gases such as propane gas or natural gas supplied by G, etc. may be used. For example, the ignition temperature of propane is approximately 430°C, and the sensible heat of the slag droplets rising in the suction pipe is sufficient to ignite. , there is no need to provide any special means for igniting the burner.
一方、バーナ４から燃料ガスと共に高速度で噴出させる
燃焼維持用の酸素含有ガスは、空気あるいは純酸素のい
ずれでもよい。ただし、エジェクター効果によるスラグ
の吸引を行うには、吐出管内の高速気流はマツハ０．５
以上、好ましくはマツハ０．５〜１．５程度とする必要
があり、このような高い気流速度になると、バーナ火炎
の維持が圧縮空気ではやや困難になる。一方、純酸素ガ
スを使用すると、燃焼速度が高く、火炎の温度も高くな
り、そのためスラグの壁面への付着率も高くなることか
ら、本発明の目的にとっては純酸素の使用が好ましい、
ただし、圧縮空気を酸素含有ガスとして使用すると、火
炎の長さが非常に長くなるので、吐出管吹出し口から炉
壁までの距離が長い場合には圧縮空気も利用できる。On the other hand, the oxygen-containing gas for maintaining combustion that is ejected from the burner 4 together with the fuel gas at high speed may be either air or pure oxygen. However, in order to suction the slag by the ejector effect, the high-speed airflow in the discharge pipe must be
As mentioned above, it is necessary that the air flow rate is preferably about 0.5 to 1.5, and at such a high air velocity, it becomes somewhat difficult to maintain the burner flame using compressed air. On the other hand, the use of pure oxygen gas results in a high combustion rate and a high flame temperature, which also increases the rate of slag adhesion to the walls, so for the purposes of the present invention, the use of pure oxygen is preferred.
However, if compressed air is used as the oxygen-containing gas, the length of the flame will become very long, so if the distance from the discharge pipe outlet to the furnace wall is long, compressed air can also be used.
吐出管内に上記のような高速気流を保持するために、燃
料ガスおよび酸素含有ガスは適当な加圧状態でバーナか
ら噴出させ、また各ガスの噴出量は燃焼を適正に維持し
、かつエジェクター効果によるスラグ吸引を確保するの
に十分な流速を得るように調整する。一般に溶融スラグ
を吸引するには、スラグ表面で５ｍ／ｓｅｃ程度の吸引
気流が必要である。吐出管内の気流速度は、吐出管およ
びバーナの口径、各ガスの圧力などの因子により変動す
るので、ガスの噴出流量もこれらの条件に応じて調整す
ればよい。In order to maintain the above-mentioned high-speed airflow in the discharge pipe, the fuel gas and oxygen-containing gas are ejected from the burner under appropriate pressure, and the ejected amount of each gas is adjusted to maintain proper combustion and maintain the ejector effect. Adjust the flow rate to be sufficient to ensure slag suction. Generally, in order to suction molten slag, a suction air flow of about 5 m/sec is required on the slag surface. Since the airflow velocity in the discharge pipe varies depending on factors such as the diameter of the discharge pipe and burner, and the pressure of each gas, the flow rate of the gas ejected may also be adjusted according to these conditions.
第２図に、本発明による転炉内壁補修方法の実施状況の
例を示す。転炉吹錬後、転炉８を転勤させて出鋼口９か
ら溶鋼を出鋼させた後、転炉を図示のように出鋼口を上
にして横転させる。１ｏは転勤支点のトラニオンである
。一方、本発明に係る補修装置１の吐出管および／また
は吸引管は支持アーム１１により旋回、傾動、伸縮自在
に支持され（図示例では吐出管を支持）、支持アーム自
体も吹付台車１２に旋回、伸縮自在に取付けられている
。FIG. 2 shows an example of the implementation status of the converter inner wall repair method according to the present invention. After the converter blowing, the converter 8 is transferred to tap molten steel from the tapping port 9, and then the converter is turned over with the tapping port facing upward as shown in the figure. 1o is the trunnion of the transfer fulcrum. On the other hand, the discharge pipe and/or suction pipe of the repair device 1 according to the present invention is supported by a support arm 11 so as to be able to rotate, tilt, and expand and contract (in the illustrated example, the discharge pipe is supported), and the support arm itself is also rotated by the spraying cart 12. , telescopically mounted.
横転させた転炉の炉芯開口から支持アームに支持された
補修装置を炉内に入れ、吸引管下端を炉内溶融スラグ近
づけ、バーナからの燃料ガスと酸素含有ガスの噴出を開
始すると、溶融スラグが吸引されて転炉内壁に吹付けら
れる。吐出管内の気流速度が上記のようにマツハ０．５
〜１．５程度であると、スラグ面と吸引管下端との距離
を２０〜８０ｍ程度とした時に溶融スラグを好都合に吸
引することができる。一方、吐出管の吹出し口とスラグ
が吹付けられる転炉壁面との距離は２〜５ｍ程度が適当
である。図示のような支持アームを設ければ、補修装置
１の位置および方向を目的の損耗部の補修に通した任意
の位置および方向に制御することができ、また位置・方
向制御とガスの開閉および流量制御を遠隔操作で行うこ
とができる。そのため、かかる支持アームの制御と転炉
の転勤位置の制御とを併用することにより、転炉内の全
ての部位を局所的に補修することができ、もちろん転炉
内壁全面に保護層を形成することもできる。なお、スラ
グ面と吸引管下端の距離を変化させずに吹付方向を変え
るために、吐出管と吸引管をを適当な角度可変式ジヨイ
ントにより連結して吸引管を垂直に維持したまま吐出管
の角度を変えることができるようにしてもよい。Insert the repair equipment supported by the support arm into the furnace through the core opening of the overturned converter, bring the lower end of the suction pipe close to the molten slag in the furnace, and start blowing out fuel gas and oxygen-containing gas from the burner. The slag is sucked in and sprayed onto the inner wall of the converter. The airflow velocity in the discharge pipe is Matsuha 0.5 as shown above.
When the distance is about 1.5 to 1.5, molten slag can be conveniently sucked when the distance between the slag surface and the lower end of the suction tube is about 20 to 80 m. On the other hand, the distance between the outlet of the discharge pipe and the converter wall surface onto which the slag is sprayed is suitably about 2 to 5 meters. If a support arm as shown in the figure is provided, the position and direction of the repair device 1 can be controlled to any position and direction necessary for repairing the target worn part, and the position and direction can be controlled as well as gas opening and closing. Flow rate control can be performed remotely. Therefore, by controlling the support arm and controlling the transfer position of the converter, all parts of the converter can be locally repaired, and of course a protective layer can be formed on the entire inner wall of the converter. You can also do that. In order to change the blowing direction without changing the distance between the slag surface and the lower end of the suction pipe, the discharge pipe and suction pipe are connected by a suitable angle-variable joint, and the suction pipe is kept vertical while the discharge pipe is The angle may be changed.
また、従来のスラグコーティング法と同様に、吹付補修
前にスラグ成分をたとえばＭｇＯ含有補修材の添加によ
り保護機能の高い組成に調整してもよい。Further, as in the conventional slag coating method, the slag component may be adjusted to a composition with a high protective function by adding, for example, an MgO-containing repair material before spray repair.
スラグ成分の調整は、粉末状の補修材を吸引途中の溶融
スラグに添加することによっても実施できる。たとえば
ドロマイトなどの補修材粉末の添加は、粉体添加管を第
１図の吸引管３の管壁を貫通して設けるか、あるいは高
速バーナ４のすぐ下側にバーナとほぼ平行に設け、この
粉体添加管からキャリアガスに同伴させて吸引管もしく
は吐出管内に噴射させることにより実施できる。ただし
、かかる粉体の添加によりスラグ温度が低下するので、
過大な量の粉体添加は避けるのが好ましい。The slag components can also be adjusted by adding a powdered repair material to the molten slag during suction. For example, to add repair material powder such as dolomite, a powder addition tube is provided by penetrating the tube wall of the suction tube 3 in FIG. This can be carried out by injecting the powder along with a carrier gas from a powder addition pipe into a suction pipe or a discharge pipe. However, since the addition of such powder lowers the slag temperature,
It is preferable to avoid adding excessive amounts of powder.
（実施例）
第１図に示すエジェクター式吸引機よりなる補修装置を
使用して、本発明の方法により転炉内壁の補修を実施し
た。(Example) Using a repair device consisting of an ejector-type suction machine shown in FIG. 1, the inner wall of a converter was repaired by the method of the present invention.
使用した吸引機は、吐出管および吸引管の外径がいずれ
も１００ ｔｍであり、長さは吐出管６００＋＋ｗ、吸
引管５００ｍｍであった。高速バーナは先端ノズル部分
の径が１６ｍであり、第１図に示すような二重管構造の
ものを吐出管の中心に軸方向に挿入して吸引機を構成し
た。The suction machine used had an outer diameter of both the discharge tube and the suction tube of 100 tm, and the length of the discharge tube was 600++w and the suction tube was 500 mm. The high-speed burner had a diameter of 16 m at the tip nozzle, and a suction machine was constructed by inserting a double-tube structure shown in FIG. 1 into the center of the discharge tube in the axial direction.
燃料ガスとして■、ＰＣから供給された圧力０．８ｋｇ
／−のプロパンガスをバーナの内管から流量０゜４Ｎｒ
ｒｒ／−４ｎで、またバーナの外周管からは圧力５ｋｇ
／ｄの純酸素ガスを２．０Ｎｒｒｒ／ｗｉｎの流量で噴
出させながら、この吸引機を出鋼直後の転炉内に挿入し
て炉内溶融スラグに近づけた。吸引管下端とスラグ面の
距離は略５００とした。この条件でスラグの吸引・吹付
試験を行った結果、スラグの吸引とともにガスが着火し
、火炎はほぼ吐出管内で始まり、吐出管より約２〜５ｍ
の長さにまで達した。■As fuel gas, pressure 0.8 kg supplied from PC
/- propane gas from the inner tube of the burner at a flow rate of 0°4Nr.
rr/-4n, and the pressure from the outer tube of the burner is 5kg.
This suction machine was inserted into the converter immediately after tapping the steel and brought close to the molten slag in the furnace while blowing out pure oxygen gas of /d at a flow rate of 2.0 Nrrr/win. The distance between the lower end of the suction tube and the slag surface was approximately 500 mm. As a result of conducting a slag suction/spraying test under these conditions, the gas ignited as the slag was suctioned, and the flame started almost within the discharge pipe, approximately 2 to 5 meters from the discharge pipe.
reached the length of
吸引スラグを約３ｍｊ！すれた転炉壁面に吹付けたとこ
ろ、この壁面に溶融スラグの付着が見られた。Approximately 3mj of suction slag! When sprayed onto the roughened converter wall, molten slag was found to be attached to the wall.
目視で確認した結果では、スラグ付着率は８０％以上で
あった。As a result of visual inspection, the slag adhesion rate was 80% or more.
比較のために、高速バーナから５ ｋｇ／−の圧力の窒
素ガスのみを流量２．５Ｎ／、／＋ｉｎで噴出させて同
条件でスラグの吸引・吹付実験を行ったところ、３ｍ１
ｉｌれた壁面へのスラグ付着率は１０〜２０％であった
。For comparison, a slag suction/spraying experiment was conducted under the same conditions by blowing out only nitrogen gas at a pressure of 5 kg/- from a high-speed burner at a flow rate of 2.5 N/, /+in.
The rate of slag adhesion to the damaged wall surface was 10 to 20%.
さらに、純酸素ガスに変えて同圧力の圧縮空気により燃
料ガスとの総流量を２．４Ｎｒｒｆ／ｓｉｎとして燃焼
を維持しつつ吸引・吹付を行った。圧縮空気の場合、火
炎は吐出管先端から約５００ ｍ離れた点より始まり、
その長さは５ｍ以上も延びた。３ｍ離れた壁面へのスラ
グの付着率は３０〜５０％程度であった。Further, instead of using pure oxygen gas, suction and spraying were performed using compressed air at the same pressure while maintaining combustion at a total flow rate of 2.4 Nrrf/sin with the fuel gas. In the case of compressed air, the flame starts approximately 500 m from the tip of the discharge pipe.
Its length was over 5m. The adhesion rate of slag to the wall surface 3 m away was about 30 to 50%.
以上の実験の結果、燃焼維持用の酸素含有ガスとしては
酸素ガスを用いる方が、燃焼炎を小さく、炎の温度を高
くできるので、スラグの冷却防止効果が大きく、スラグ
粒を少なくとも半溶融状態に保持できるので、スラグ付
着量が多くなることが判明した。ただし、耐火壁面まで
距離がある場合など、場合によっては圧縮空気でもある
程度の補修効果が得られることがわかった。As a result of the above experiments, the use of oxygen gas as the oxygen-containing gas for maintaining combustion makes the combustion flame smaller and the flame temperature higher, which has a greater effect of preventing slag cooling, and keeps the slag grains at least semi-molten. It was found that the amount of slag adhesion was increased because the slag could be maintained at a higher temperature. However, in some cases, such as when there is a distance to a fireproof wall, compressed air has been found to be effective in repairing to some extent.
（発明の効果）
以上に説明したように、本発明の転炉内壁補修方法およ
び装置により次に列挙するような効果が得られる。(Effects of the Invention) As explained above, the converter inner wall repair method and apparatus of the present invention provide the following effects.
■転炉内の溶融スラグを補修材に利用し、装置も比較的
簡単な構造であるので、低コストで補修できる。■The molten slag in the converter is used as the repair material, and the equipment has a relatively simple structure, so it can be repaired at low cost.
■トラニオン側も含む任意の転炉内壁面位置に確実に補
修材吹付を行うことができる。■Repair material can be reliably sprayed to any location on the inner wall surface of the converter, including the trunnion side.
■水を使用しないので、補修に伴う転炉内壁の温度低下
がほとんどなく、熱劣化による炉壁耐火物のスポーリン
グ等の問題が起こりにくい。■Since no water is used, there is almost no temperature drop in the converter inner wall during repairs, and problems such as spalling of the furnace wall refractories due to thermal deterioration are less likely to occur.
■吸引途中の溶融スラグに粉末状補修材を添加するか、
吸引開始前の溶融スラグに補修材を添加することにより
、スラグ成分を容易に調整でき、それにより一層強力な
保護層を形成することができる。■Add powdered repair material to the molten slag during suction, or
By adding the repair material to the molten slag before suction starts, the slag components can be easily adjusted, thereby forming a stronger protective layer.
■吹付けに伴う熱量により炉壁温度低下が防止でき、補
修に要する時間を充分とれる。■The amount of heat associated with spraying prevents the furnace wall temperature from dropping, allowing enough time for repairs.
第１図は、本発明の転炉内壁補修装置の１例を示す略式
断面図、および
第２図は、本発明の方法の実施状況を示す一部破断斜視
図である。FIG. 1 is a schematic sectional view showing an example of the converter inner wall repair device of the present invention, and FIG. 2 is a partially cutaway perspective view showing the state of implementation of the method of the present invention.
Claims (5)
んだエジェクター式吸引装置を使用して、前記バーナの
燃焼を維持しながら転炉内溶融スラグを吸引し、前記バ
ーナの火炎により吸引スラグの冷却を防止しつつ炉内耐
火壁面に前記吸引スラグを吹付けて付着させることを特
徴とする、転炉内壁の補修方法。(1) Using an ejector-type suction device incorporating a high-speed burner as a nozzle for blowing out the driven air flow, the molten slag in the converter is sucked while maintaining the combustion of the burner, and the sucked slag is cooled by the flame of the burner. A method for repairing an inner wall of a converter, characterized in that the suction slag is sprayed onto the refractory wall surface of the furnace to make it adhere to the refractory wall surface.
であることをさらに特徴とする特許請求の範囲第１項記
載の方法。(2) The method according to claim 1, further characterized in that the oxygen-containing gas supplied to the high-speed burner is pure oxygen.
するか、吸引開始前の前記溶融スラグに補修材を添加す
ることにより、スラグ成分を調整することをさらに特徴
とする特許請求の範囲第１項記載の方法。(3) A claim further characterized in that the slag components are adjusted by adding a powdered repair material to the molten slag during suction or by adding a repair material to the molten slag before the start of suction. The method described in paragraph 1.
面を貫通して軸方向に管内に装入された、燃料ガス供給
源および酸素含有ガス供給源に接続されている高速バー
ナ、ならびに前記吐出管から連通分岐した吸引管からな
るエジェクター式吸引機により構成される、転炉内溶融
スラグの吸引吹付により転炉内壁を補修する転炉内壁補
修装置。(4) a discharge pipe consisting of a closed end pipe, a high-speed burner inserted into the pipe in the axial direction through the closed end face of the discharge pipe and connected to a fuel gas supply source and an oxygen-containing gas supply source; A converter inner wall repair device for repairing the converter inner wall by suctioning and spraying molten slag in the converter, which is constituted by an ejector-type suction machine consisting of a suction pipe connected and branched from the discharge pipe.
動、伸縮自在に支持する可動支持アームをさらに備えて
いることを特徴とする、特許請求の範囲第４項記載の転
炉内壁補修装置。(5) The converter inner wall repair device according to claim 4, further comprising a movable support arm that supports the discharge pipe and/or the suction pipe in a rotatable, tiltable, telescopic manner. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6032885A JPS61217517A (en) | 1985-03-25 | 1985-03-25 | Method for repairing inside wall of converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6032885A JPS61217517A (en) | 1985-03-25 | 1985-03-25 | Method for repairing inside wall of converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61217517A true JPS61217517A (en) | 1986-09-27 |
| JPH0140088B2 JPH0140088B2 (en) | 1989-08-25 |
Family
ID=13138989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6032885A Granted JPS61217517A (en) | 1985-03-25 | 1985-03-25 | Method for repairing inside wall of converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61217517A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183147A (en) * | 2011-04-01 | 2011-09-14 | 常君辰 | Spray gun of flame gunning machine |
-
1985
- 1985-03-25 JP JP6032885A patent/JPS61217517A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183147A (en) * | 2011-04-01 | 2011-09-14 | 常君辰 | Spray gun of flame gunning machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0140088B2 (en) | 1989-08-25 |
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