JPS60177118A - Lance for converter - Google Patents
Lance for converterInfo
- Publication number
- JPS60177118A JPS60177118A JP3033184A JP3033184A JPS60177118A JP S60177118 A JPS60177118 A JP S60177118A JP 3033184 A JP3033184 A JP 3033184A JP 3033184 A JP3033184 A JP 3033184A JP S60177118 A JPS60177118 A JP S60177118A
- Authority
- JP
- Japan
- Prior art keywords
- lance
- oxygen
- secondary combustion
- nozzle
- nozzles
- 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
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
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は転炉ランスに関し、上吹きランスからの２次
燃焼用酸素を効率よく噴出させることによシ転炉精錬時
の熱付加を効率的に行うことを目的とする。[Detailed Description of the Invention] This invention relates to a converter lance, and an object of the present invention is to efficiently add heat during converter refining by efficiently blowing out secondary combustion oxygen from an upper blowing lance. do.
転炉精錬に際しての熱付加は、溶銃使用比率を減少させ
スクラップの使用を多くする所謂病スクラップ操業や、
ステンレス鋼等高合金鋼の溶製時の熱余裕或いは銑鉱石
、マンガン鉱石等酸化物の還元量の増大等の点から近年
増々その重要性が増しておシ、これに関する種々の提案
がなされ実施されている。Addition of heat during converter refining can lead to so-called sick scrap operations, which reduce the ratio of melt guns used and increase the use of scrap.
It has become increasingly important in recent years due to the heat margin during melting of high-alloy steels such as stainless steel, and the increase in the amount of reduction of oxides such as pig ore and manganese ore, and various proposals have been made and implemented in this regard. has been done.
このような熱付加技術の代表的なものを挙げれば、コー
クスや石炭或いはＦＳｉ合金等の発熱剤を転炉の中へ投
入するか又は上吹き酸素ランスを通して鋼浴内に吹き込
み、温度を上昇させる方法と上吹き酸素の一部によシ転
炉内で発生するＣＯガスを転炉内で燃焼させ発生する熱
を利用する方法がある。A typical example of such heat addition technology is to raise the temperature by injecting a heat generating agent such as coke, coal, or FSi alloy into the converter or by blowing it into the steel bath through a top-blown oxygen lance. There is a method in which CO gas generated in a converter is combusted in a converter using part of the top-blown oxygen and the generated heat is utilized.
後者のＣＯガスを燃焼する方法は２次燃焼法として我国
において一般的に実施されている＠第１図にこの２次燃
焼法の概略を示す。（１）が転炉、（２）が上吹きラン
スであシ、このランス（２）から溶鋼（２Ｘ）に向けて
精錬用酸素ジェットを吹込みＣ＋ＨＯ２→ＣＯの反応を
行わせる。The latter method of burning CO gas is commonly practiced in Japan as a secondary combustion method. An outline of this secondary combustion method is shown in Fig. 1. (1) is a converter, (2) is a top blowing lance, and a refining oxygen jet is blown into the molten steel (2X) from this lance (2) to cause a reaction of C+HO2→CO.
同時にランス（２）の下端側部から２次燃焼用酸素を吹
込み、上記反応によシ発生した転炉ガス（ＣＯ）をＣＯ
十−１０２→ｃｏ２の反応によシ燃焼させ、この反応熱
によシ熱付加を行なうものである。この２次燃焼用酸素
の吹込みは溶鋼に接近しすぎると下式に示すように溶鋼
中の炭素又は溶鋼と反応し脱炭及び鉄の酸化が起る。At the same time, oxygen for secondary combustion is blown into the lower end side of the lance (2), and the converter gas (CO) generated by the above reaction is converted into CO.
The combustion is carried out by the reaction of 10-102→co2, and the heat of this reaction is used to add heat. If this secondary combustion oxygen is blown too close to the molten steel, it will react with the carbon in the molten steel or the molten steel, causing decarburization and oxidation of the iron, as shown in the equation below.
Ｃ＋ −０，−＋ｃｏ 脱炭反応
Ｆｅ ＋ −０２→ＦｅＯ鉄の酸化反応また反対に溶鋼
から遠すぎると２次燃焼で発生した熱を溶鋼へ伝える効
果が減少する。C+ -0, -+co Decarburization reaction Fe + -02→FeO Oxidation reaction of iron On the other hand, if the distance is too far from the molten steel, the effect of transmitting the heat generated by secondary combustion to the molten steel will be reduced.
第２図はこの２次燃焼法に用いるランス下端部の拡大図
であシ、上記した２次燃焼用酸素の吹込み位置の要求を
満す構成になっている。このランスは酸素供給用の内管
（５）とその外側に設けられた冷却水通路（６）から成
る３重管構造となっている。そしてこの３重管構造の下
端部に、精錬用の酸素吹出し孔（３）が形成され、側部
には斜め下方に伸びる２次燃焼用酸素の吹出し孔（４）
が形成されている。FIG. 2 is an enlarged view of the lower end of the lance used in this secondary combustion method, and has a configuration that satisfies the above-mentioned requirements for the injection position of oxygen for secondary combustion. This lance has a triple tube structure consisting of an inner tube (5) for oxygen supply and a cooling water passage (6) provided outside of the inner tube (5). At the bottom end of this triple-pipe structure, an oxygen outlet (3) for refining is formed, and at the side, there is an oxygen outlet (4) for secondary combustion extending diagonally downward.
is formed.
しかし、このような従来のランスにおいては、２次燃焼
用酸素の吹出し孔（４）は単なる円形の孔であるため、
ここから吹出される酸素ジェットは水平方向に広がらず
、そのために２次燃焼ゾーンが全体に行きわたらず着熱
効率（Ｃｏ燃焼による反応熱が溶鋼に伝わる効率）を低
下させる原因になっていた。However, in such a conventional lance, the secondary combustion oxygen blow-off hole (4) is just a circular hole;
The oxygen jet blown out from here does not spread horizontally, which prevents the secondary combustion zone from reaching the entire area, which causes a reduction in heat transfer efficiency (the efficiency with which reaction heat from Co combustion is transferred to molten steel).
このような欠４を改善するためには、孔（４）の数を多
くして酸素の吹出し分布を均一化する７）ｘ或いは孔（
４）の形状を工夫して、酸素が水平方向に広がるように
する方法が考えられるが、前者の場合には孔を多数設け
る作業が大変である上、強度が低下する欠点がおる。ま
た後嘗の孔形状の変更は加工が難しく事実上不可能であ
る。In order to improve this kind of deficiency 4, the number of holes (4) should be increased to make the oxygen blowing distribution uniform7)x or holes (4).
4) A method can be considered in which the shape is devised so that oxygen spreads horizontally, but in the former case, the work of creating a large number of holes is difficult and the strength is reduced. In addition, changing the shape of the hole afterward is difficult and virtually impossible.
本発明は上記した従来技術の欠点を改善するためになさ
れたもので、ランス下端側部に゛若千大きめの孔ｆ、あ
け、ここに予め所定形状に成形したノズルを装着するこ
とによ９２次燃焼用酸素の広が多角度を任意に調整し得
るようにしたものである〇
以下本発明の一実施例を図面に基づいて説明する。The present invention has been made to improve the above-mentioned drawbacks of the prior art, and is made by drilling a slightly larger hole f in the side of the lower end of the lance, and attaching a nozzle preformed in a predetermined shape thereto. The spread angle of oxygen for subsequent combustion can be arbitrarily adjusted. An embodiment of the present invention will be described below with reference to the drawings.
第３図は本発明によるランスの一実施例を示すもので下
端部の拡大図である。αＱがランス本体、ＤＪが酸素供
給用の内管であシ、このｌ！ＩＦＩＩＩに冷却水通路ｏ
２（２）が２重に巻かれ３重管構造となっている。この
ランスαＱの底面には精錬用の酸素吹出し孔Ｑ４が形成
されている。FIG. 3 shows an embodiment of the lance according to the present invention, and is an enlarged view of the lower end. αQ is the lance body, DJ is the inner tube for oxygen supply, this l! Cooling water passage o to IFIII
2 (2) is wound twice to form a triple tube structure. An oxygen blowing hole Q4 for refining is formed in the bottom surface of this lance αQ.
この実施例では孔ａ千を底面に周方向均等に３ケ所形成
しである。このランスＱＯ下端部近傍には更にノズル装
着用の孔（ハ）が内管ａ１から外部へと形成されている
。そして孔０５にはノズルＱＱが装着されている。この
実施例では孔（至）にメネジを切シ、ノズルαＱにはオ
ネジを切って孔（ハ）にネジ込んだ後浪接するように構
成している。In this embodiment, three holes are formed on the bottom surface evenly in the circumferential direction. Near the lower end of this lance QO, a hole (c) for mounting a nozzle is further formed extending from the inner tube a1 to the outside. A nozzle QQ is attached to the hole 05. In this embodiment, a female thread is cut in the hole (to), and a male thread is cut in the nozzle αQ, which is screwed into the hole (c) and then connected to the nozzle.
孔（ト）はこの実施例では斜め下方に伸びておシ、ラン
スαＱの中心線に対する角度αを３０としている。In this embodiment, the hole (G) extends obliquely downward and forms an angle α of 30 with respect to the center line of the lance αQ.
ノズルαＱの形状は目的に応じて適宜の形状とすれば良
いが、この実施例では第４図乃至第６図に詳細に示すよ
うに、吹出し酸素が水平力゛向に広がるように構成され
ている。即ちノズル（ト）の内部は、酸素導入管（１６
０）と拡大室（１６１）と噴出口（１６２）とから構成
され、拡大室（１６１）は導入管（１６０）よシ大きな
断面積となっている。The shape of the nozzle αQ may be any suitable shape depending on the purpose, but in this embodiment, as shown in detail in FIGS. 4 to 6, it is configured so that the blown oxygen spreads in the horizontal direction. There is. That is, the inside of the nozzle (G) has an oxygen introduction pipe (16
The expansion chamber (161) has a larger cross-sectional area than the introduction pipe (160).
また噴出口（１６２）は導入管（１６０）よシ小さな断
面積をもち、この実施例では幅方向に広がるスリットに
なっている。このような拡大室（１６１）を設けること
にχシ、静圧が一定となシスリット状噴出口（１６２）
から均一に酸素を噴射することが可能である。また噴出
口（１６２）は複数の小径孔としても良いが、この場合
その総断面秩を拡大室（１６１）の断面積よシも小さく
する必要がある・
孔（２）及び′ノズル（１０の数は、ノズルα０からの
酸素の拡が多角度によっても異々るが、少なくとも３個
以上を周方向に等間隔で配設すれ１は、２次燃焼用酸素
を転炉内全域に吹出すことができ、２次燃焼用ゾーンを
均一化することが可能である。Further, the spout (162) has a smaller cross-sectional area than the introduction pipe (160), and in this embodiment is a slit that widens in the width direction. In addition to providing such an enlarged chamber (161), a cyslit-shaped spout (162) with a constant static pressure is provided.
It is possible to uniformly inject oxygen from In addition, the spout (162) may have multiple small-diameter holes, but in this case, the total cross-sectional area must be smaller than the cross-sectional area of the enlarged chamber (161). The number varies depending on the angle at which the oxygen is spread from the nozzle α0, but at least three or more are arranged at equal intervals in the circumferential direction, and 1 blows out oxygen for secondary combustion throughout the entire area inside the converter. It is possible to make the secondary combustion zone uniform.
なお、孔（２）とノズルαＱに２次燃焼酸素用管を別途
設けても良く、この場合２次燃焼用酸。Note that a secondary combustion oxygen pipe may be separately provided in the hole (2) and the nozzle αQ, and in this case, a secondary combustion oxygen pipe may be provided separately.
素の供給が円滑に行われる利点がある。There is an advantage that the supply of raw materials is carried out smoothly.
以上述べたように本発明の転炉ランスによれば、ランス
本体に孔を設け、この孔に別途成形したノズルを装着す
るようにしているため吹出し酸素の拡が多角度等をノズ
ル形状によシ自由にかえることができる。As described above, according to the converter lance of the present invention, a hole is provided in the lance body, and a separately formed nozzle is attached to this hole, so that the blown oxygen can be spread at multiple angles due to the shape of the nozzle. You can change it freely.
そのため２次燃焼ゾーンを均等化でき、２次燃焼による
着熱効率を向上できる等の効果がある。Therefore, the secondary combustion zone can be equalized, and the heat transfer efficiency by secondary combustion can be improved.
第１図は２次燃焼法の°説明図、第２図は従来のランス
構造の説明図、第３図は本発明の一実施例を示す部分正
断面図、第４図はノズルの一実施例を示す平断面図、第
５図はその正断面図、第６図は側面図であるαＯ・・・
ランス、αｐ・・・内管、（６）と（２）・・・冷却水
通路、０４・・・精錬用酸素吹出孔、αＱ・・・ノズル
装着用の孔、αＱ・・・ノズル。
特許出願人 日本鋼管株式会社
発明者 長谷用 輝 之
第１図 第２図
第５図 ｇ６図Fig. 1 is an explanatory diagram of the secondary combustion method, Fig. 2 is an explanatory diagram of the conventional lance structure, Fig. 3 is a partial front cross-sectional view showing an embodiment of the present invention, and Fig. 4 is an implementation of the nozzle. αO... is a plan sectional view showing an example, FIG.
Lance, αp...Inner pipe, (6) and (2)...Cooling water passage, 04...Oxygen blowing hole for refining, αQ...Nozzle mounting hole, αQ...Nozzle. Patent applicant Nippon Kokan Co., Ltd. Inventor Teruyuki Hase Figure 1 Figure 2 Figure 5 Figure g6
Claims (1)
外部とを連通ずる孔と、該孔内に装着された所定形状の
ノズルを有する転炉ランス。A converter lance having a hole provided in the side near the lower end of the lance that communicates an oxygen supply inner pipe with the outside, and a nozzle of a predetermined shape installed in the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3033184A JPS60177118A (en) | 1984-02-22 | 1984-02-22 | Lance for converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3033184A JPS60177118A (en) | 1984-02-22 | 1984-02-22 | Lance for converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60177118A true JPS60177118A (en) | 1985-09-11 |
Family
ID=12300826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3033184A Pending JPS60177118A (en) | 1984-02-22 | 1984-02-22 | Lance for converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60177118A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040012167A (en) * | 2002-08-01 | 2004-02-11 | 주식회사 포스코 | Lance for converter refining |
-
1984
- 1984-02-22 JP JP3033184A patent/JPS60177118A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040012167A (en) * | 2002-08-01 | 2004-02-11 | 주식회사 포스코 | Lance for converter refining |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ES2265586T3 (en) | INJECTOR FOR METAL FOUNDING OVEN. | |
| EP0866139B1 (en) | Method using a burner/lance for injecting gas into molten metal | |
| US5377960A (en) | Oxygen/carbon blowing lance assembly | |
| US3427151A (en) | Process and apparatus for introducing a gaseous treating stream into a molten metal bath | |
| US2829960A (en) | Method and metallurgical device for the refining of steel | |
| JP2014221928A (en) | Converter blowing method | |
| JPS6311405B2 (en) | ||
| US5681526A (en) | Method and apparatus for post-combustion of gases during the refining of molten metal | |
| US4366953A (en) | Oxygen lance | |
| JPS60177118A (en) | Lance for converter | |
| JP2006328432A (en) | Blowing method for converter and top-blowing lance for converter blowing | |
| CN102628094B (en) | Buried oxygen blowing and decarburization process for electric-arc furnace steelmaking and control method | |
| JPS636188Y2 (en) | ||
| JPS636189Y2 (en) | ||
| JP4385855B2 (en) | Converter blowing method and top blowing lance for converter blowing | |
| SU855004A1 (en) | Tuyere for oxygen blasting of electric arc furnace bath | |
| JPH03274218A (en) | Multiple purpose three-ply pipe lance | |
| JP2002285224A (en) | Blowing method into converter and blowing lance for converter | |
| SU763474A1 (en) | Gas-oxygen tuyere | |
| JP3959576B2 (en) | Hot metal pretreatment equipment | |
| JP2013091847A (en) | Blowing method of converter | |
| US3725040A (en) | Method of operating a variable flame oxy-fuel burner | |
| JPH065406Y2 (en) | Converter blowing lance | |
| WO1997002365A1 (en) | Device for after-burning combustible components of the atmosphere in metallurgical smelting vessels | |
| JPH0512271Y2 (en) |