JP2917848B2 - Converter blasting and furnace mouth metal melting lance - Google Patents
Converter blasting and furnace mouth metal melting lanceInfo
- Publication number
- JP2917848B2 JP2917848B2 JP3712795A JP3712795A JP2917848B2 JP 2917848 B2 JP2917848 B2 JP 2917848B2 JP 3712795 A JP3712795 A JP 3712795A JP 3712795 A JP3712795 A JP 3712795A JP 2917848 B2 JP2917848 B2 JP 2917848B2
- Authority
- JP
- Japan
- Prior art keywords
- lance
- converter
- nozzle
- furnace
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、転炉の吹錬中に転炉
の炉口に付着した地金を溶解除去できる転炉吹錬兼炉口
地金溶解用のランスに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lance for blowing and melting a slab metal which is attached to a furnace opening of a converter during melting of the converter.
【０００２】[0002]
【従来の技術】転炉を使った酸素吹錬は、転炉炉口から
酸素吹き込み用のランスを挿入し、このランスからの高
純度酸素を転炉内の溶融鉄浴表面に音速のスピードで吹
き付けて行っている。溶融鉄浴面へのそのような酸素吹
き付けによって溶融鉄の一部は吹き飛ばされ、炉口近傍
で外気に当たり凝固し、炉口に付着する。炉口に付着し
た地金はスクラップ装入不能などの操業を阻害する原因
となる。一方、そのようにして吹き飛ばされた溶融鉄の
一部はランスにも衝突し、ノズル溶損のためランス寿命
を短くする原因ともなっている。2. Description of the Related Art In oxygen blowing using a converter, a lance for blowing oxygen is inserted from a converter furnace opening, and high-purity oxygen from the lance is applied to the surface of a molten iron bath in the converter at a sonic speed. I'm spraying. A portion of the molten iron is blown off by such oxygen spraying onto the molten iron bath surface, hits outside air near the furnace opening, solidifies, and adheres to the furnace opening. Ingots adhering to the furnace mouth may hinder operations such as the inability to load scrap. On the other hand, a part of the molten iron blown off in this way also collides with the lance, which causes the lance life to be shortened due to the nozzle melting.
【０００３】特に、炉口に付着した地金の除去は、操業
を一時中断して酸素ガス切断によって行うなどコスト増
加の大きな要因になっており、今日、それを軽減しよう
とする試みが多く提案されている。[0003] In particular, the removal of bullion adhering to the furnace port is a major factor in cost increase, such as temporarily interrupting the operation and cutting off oxygen gas, and many attempts have been made to reduce this today. Have been.
【０００４】特開平１−136923号公報で提案されている
のは、酸素ランスの先端に板を取り付け、炉口に付着し
た地金に酸素を直接当てて、溶解除去する方法である
が、地金溶解専用ランスのため、非製鋼時間に使用しな
ければならないので、転炉操業ピッチの低下となる。Japanese Patent Application Laid-Open No. 1-136923 proposes a method in which a plate is attached to the tip of an oxygen lance and oxygen is directly applied to a metal adhering to a furnace port to dissolve and remove the metal. Since the lance is exclusively used for melting gold, it must be used during non-steel making hours, which lowers the converter operation pitch.
【０００５】特開平４−88110 号公報において提案され
ているのは、酸素ランスの先端に回転する板を取り付
け、また、酸素ガスの流路がらせん状になるように溝を
作り、これにより炉口付着地金を360 度均等に溶解除去
する方法であり、これも上述の従来例と同様に、非製鋼
時間内に使用しなければならない等の問題がある。[0005] Japanese Patent Application Laid-Open No. 4-88110 proposes that a rotating plate is attached to the tip of an oxygen lance, and a groove is formed so that the flow path of oxygen gas becomes spiral. This method dissolves and removes the metal adhered to the mouth evenly by 360 degrees, and also has a problem that it must be used within a non-steel making time similarly to the above-mentioned conventional example.
【０００６】特公平３−77248 号公報は、精錬用の主孔
の他に、副孔を設け、２次燃焼を促進させる方法を開示
している。また、主ノズルと副ノズルとは酸素流路が分
離されており、副ノズルの噴出流速は亜音速になるよう
ガス流抵抗体が設けてある。この方法によれば、吹錬中
に炉口地金を溶解できるメリットはあるが、同時に転炉
耐火物の溶損を促進させてしまうという欠点もある。Japanese Patent Publication No. 3-77248 discloses a method in which a secondary hole is provided in addition to a main hole for refining to promote secondary combustion. Further, the main nozzle and the sub-nozzle are separated from each other in an oxygen flow path, and a gas flow resistor is provided so that the jet velocity of the sub-nozzle is subsonic. According to this method, there is an advantage that the furnace mouth metal can be melted during blowing, but at the same time, there is a disadvantage that melting of the converter refractory is promoted.
【０００７】特開平４−308020号公報に開示される方法
では、複数のノズル孔を放射状に設け、炉口の全周にわ
たって均一に酸素を噴射させる。ノズル孔は下向きに０
°〜30°の勾配で地金の溶解に好適な超音速領域にする
ためにラバールノズルにしてある。しかし、これは酸素
ランスによって炉口地金を溶解する方法であって、前述
の場合と同様に非製鋼時間に使用しなければならないと
いう制約がある。In the method disclosed in Japanese Patent Application Laid-Open No. 4-308020, a plurality of nozzle holes are radially provided, and oxygen is uniformly injected over the entire circumference of the furnace port. Nozzle hole is downward 0
The Laval nozzle is used to make the supersonic range suitable for melting the metal at a gradient of 30 ° to 30 °. However, this is a method of melting a furnace mouth metal by an oxygen lance, and has a limitation that it must be used during a non-steel making time as in the case described above.
【０００８】特開昭61−143507号公報には、長径軸と短
径軸の比が1.2 以上の非円形開口よりなり、互いに同形
のノズルを少なくとも２つ以上有することを特徴とする
転炉の２次燃焼促進用ランスが開示されている。しか
し、この場合にも２次燃焼促進による転炉耐火物の溶損
がみられ、その改善が求められている。Japanese Unexamined Patent Publication (Kokai) No. 61-143507 discloses a converter having a non-circular opening having a ratio of a major axis to a minor axis of 1.2 or more and having at least two nozzles of the same shape. A secondary combustion promoting lance is disclosed. However, also in this case, the converter refractory is eroded due to the promotion of the secondary combustion, and its improvement is required.
【０００９】[0009]
【発明が解決しようとする課題】ここに、この発明の目
的は、吹錬兼地金溶解用のランスを用いて転炉の生産性
を向上させる技術を開発することである。さらにこの発
明の別の目的は、２次燃焼による炉口地金溶解促進と転
炉耐火物溶損の抑制という相反する要求を共に満足する
技術を開発することである。SUMMARY OF THE INVENTION An object of the present invention is to develop a technique for improving the productivity of a converter using a lance for blowing and melting metal. Still another object of the present invention is to develop a technology that satisfies both conflicting requirements of promoting melting of the furnace mouth metal by secondary combustion and suppressing the melting of converter refractories.
【００１０】[0010]
【課題を解決するための手段】本発明者らは、かかる目
的を達成すべく、特開平６−57320 号公報 (特願平３−
90915 号) に開示されたような溶融金属精錬用の低スピ
ッティング型上吹ランスに着目したが、それによれば炉
口の地金付が減少する効果が得られたが、完全に無くす
ことはできていない。Means for Solving the Problems The present inventors have disclosed Japanese Patent Application Laid-Open No. Hei 6-57320 (Japanese Patent Application No.
No. 90915) focused on a low spitting type upper blowing lance for molten metal refining as disclosed in Not done.
【００１１】そこで本発明者らは、ノズル出口部の外側
180度の領域の少なくとも一部に図のような曲率Ｒ
(例：２〜30mm) を付与し、精錬用ガスとして吹込む酸
素ジェットの流れをノズル孔外側のみ広げ、炉口付近で
の２次燃焼を促進させて、炉口地金を溶解することがで
き、上述の目的が達成されることを知り、本発明を完成
した。なお、この点従来は円周配置ノズルの形状は、超
音速ジェット噴流形成の関係上、吐出孔流路とノズル先
端面は垂直であった。Therefore, the inventors of the present invention have proposed a method in which
At least a part of the 180-degree area has a curvature R as shown in the figure.
(Example: 2 to 30 mm), the flow of oxygen jet blown as refining gas is expanded only outside the nozzle hole, secondary combustion near the furnace port is promoted, and the furnace port metal is melted. It was found that the above-mentioned object was achieved and the present invention was completed. In this regard, conventionally, in the configuration of the circumferentially arranged nozzle, the discharge hole flow path and the nozzle tip surface are perpendicular to each other due to the formation of the supersonic jet jet.
【００１２】ここに、この発明の要旨とするところは、
溶融金属浴面に酸素ガスを吹き付ける精錬プロセスにお
いて用いる、先端に円周配置の複数ノズルを有する上吹
ランスであって、該ノズルのノズル吐出孔のランス外側
180度領域の少なくとも１部に、好ましくはランス外側
180度または360 度の領域の全域に２〜30mmのＲの曲率
を付け、例えば溶融金属浴面と90度の方向に流れを作る
ことにより、転炉炉内の２次燃焼を促進させ、転炉精錬
を行いながら炉口付着地金を溶解させる転炉吹錬兼炉口
地金溶解用ランスである。Here, the gist of the present invention is as follows.
An upper-blowing lance having a plurality of circumferentially arranged nozzles at a tip, which is used in a refining process of blowing oxygen gas onto a molten metal bath surface, the lance being outside a nozzle discharge hole of the nozzle.
At least part of the 180 degree area, preferably outside the lance
The secondary combustion in the converter furnace is promoted by forming a radius of curvature of 2 to 30 mm over the entire region of 180 degrees or 360 degrees, for example, by forming a flow in the direction of 90 degrees with the molten metal bath surface, This is a converter blasting / furnace metal melting lance that melts the metal adhered to the furnace mouth while performing furnace refining.
【００１３】すなわち、この発明の好適実施態様によれ
ば、溶融金属浴面に酸素ガスを吹き付ける精錬プロセス
において用いる、先端に円周配置の複数ノズルを有する
上吹ランスにおいて、ノズル吐出孔のランス外側180 度
または360 度の全領域にＲの曲率を付け、このＲが２〜
30mmの範囲にくるようにする。 That is, according to a preferred embodiment of the present invention, in an upper blowing lance having a plurality of circumferentially arranged nozzles at the tip, which is used in a refining process of blowing oxygen gas onto a molten metal bath surface, the outer lance of the nozzle discharge hole is provided. A curvature of R is applied to the entire area of 180 degrees or 360 degrees, and this R is 2 to 2.
To come in the range of 30mm.
【００１４】[0014]
【作用】次に、図面を参照しながらこの発明の作用をさ
らに具体的に説明する。図１(a) は、この発明にかかる
ランスのノズル部分、つまりランスノズルの概略断面
図、図１(b) は、その半分の底面図であり、図中、ラン
ス10の先端に設けたノズル部12には円周上に６個のノズ
ル吐出孔24が設けられており、中心部に中心孔26が設け
られている。Next, the operation of the present invention will be described more specifically with reference to the drawings. FIG. 1A is a schematic sectional view of a nozzle portion of a lance according to the present invention, that is, a lance nozzle, and FIG. 1B is a bottom view of a half of the nozzle portion. The portion 12 is provided with six nozzle discharge holes 24 on the circumference, and a center hole 26 is provided at the center.
【００１５】この発明によれば、ノズル吐出孔24のラン
ス外側の領域の少なくとも一部、例えばランス外側180
度の領域、つまり図１(b) のノズル吐出孔24のハッチを
付けて示した領域にＲの曲率を設けるのである。以下、
この領域を曲率領域という。According to the present invention, at least a part of the area outside the lance of the nozzle discharge hole 24, for example, the outside of the lance 180
The curvature of R is provided in the area of the degree, that is, the area shown by hatching the nozzle discharge holes 24 in FIG. 1 (b). Less than,
This area is called a curvature area.
【００１６】なお、図示例では、６個のノズル吐出孔を
設け、それぞれのランス外側 180度領域に曲率領域を設
けているが、このノズル設置数およびそのうちのどれに
曲率領域を設けるかは制限されない。全周において２次
燃焼を促進する必要があるときには円周配置のすべての
ノズル吐出孔に曲率領域を設けることが好ましい。ま
た、図示例では各ノズル吐出孔の外側180 度の領域に曲
率領域を設けているが、また、360 度の領域にわたって
曲率領域を設けるようにしてもよい。In the illustrated example, six nozzle discharge holes are provided, and a curvature region is provided in a 180-degree region outside each lance. However, the number of nozzles to be installed and which of them has a curvature region are limited. Not done. When it is necessary to promote the secondary combustion over the entire circumference, it is preferable to provide a curvature region in all the nozzle discharge holes arranged in the circumferential direction. Further, in the illustrated example, the curvature region is provided in a region of 180 degrees outside each nozzle discharge hole, but a curvature region may be provided in a region of 360 degrees.
【００１７】この発明によれば、上述のような構成を取
ることにより、まず酸素吹錬による精錬と炉口地金溶解
が同時にでき、さらに精錬特性に悪影響を及ぼさない。
また、２次燃焼の促進は、主に炉口地金溶解に有効な程
度となり、転炉耐火物の溶損を促進させない弱２次燃焼
型のノズルが得られる。この点、従来の２次燃焼ノズル
を用いた例では、着熱効率を上げると転炉耐火物溶損に
悪影響を及ぼす。しかし、この発明にかかるランスによ
る弱２次燃焼ノズルでの着熱効率の向上はないため、転
炉耐火物の溶損が促進されることはない。According to the present invention, by adopting the above-described configuration, first, refining by oxygen blowing and melting of the furnace opening metal can be performed at the same time, and the refining characteristics are not adversely affected.
Further, the promotion of the secondary combustion is mainly effective for melting the furnace mouth metal, and a weak secondary combustion type nozzle that does not promote the melting of the converter refractory can be obtained. In this regard, in the example using the conventional secondary combustion nozzle, increasing the heat-emitting efficiency has a bad influence on the converter refractory erosion. However, since the lance according to the present invention does not improve the heating efficiency of the weak secondary combustion nozzle, the erosion of the converter refractory is not promoted.
【００１８】次に、図２に関連させてさらにこの点につ
いて説明する。図２は、この発明の作用を説明する模式
図であり、図１(a) に相当する説明図である。図中の矢
印は酸素ガスの流れの方向を示し、図１と同一部材は同
一符号で示す。Next, this point will be further described with reference to FIG. FIG. 2 is a schematic diagram for explaining the operation of the present invention, and is an explanatory diagram corresponding to FIG. 1 (a). The arrows in the figure indicate the direction of the flow of the oxygen gas, and the same members as those in FIG.
【００１９】図示のように、この発明にかかるランスノ
ズルの先端領域には酸素吹錬を行う場合、領域Ａ、Ｂ、
Ｃ、そしてＤというそれぞれ異なった作用を発揮する領
域が形成される。As shown in the figure, when oxygen blowing is performed on the tip region of the lance nozzle according to the present invention, regions A, B,
Regions C and D exhibiting different functions are formed.
【００２０】 Ａ領域： ノズル出口部外側 180度領域の少なくとも一部にＲ
(Ｒ:2〜30mm) が付与された領域である。図示例では360
度領域の全域にわたってＲが付与されている。曲率半
径Ｒのとり方は、転炉形状、操業条件により適宜設定す
ればよい。180 度領域の少なくとも１部にＲを設けてい
ることから炉口方向への酸素ガス流れを作り、例えば溶
融金属浴面の方向に対し、90度の方向、つまり水平方向
に酸素ガス流れを形成し、地金溶解を促進する作用が発
揮される。Area A: At least part of the 180-degree area outside the nozzle outlet is R
( R : 2 to 30 mm). 360 in the example shown
R is provided over the entirety of the degree region. How to set the radius of curvature R may be appropriately set according to the converter shape and operating conditions. Since R is provided in at least a part of the 180-degree region, an oxygen gas flow is generated in the direction of the furnace port, for example, an oxygen gas flow is formed in a direction at 90 degrees to the direction of the molten metal bath surface, that is, in a horizontal direction. The effect of promoting the dissolution of the metal is exhibited.
【００２１】Ｂ領域：Ａ領域でほゞ水平方向に吐出され
た酸素ガスは次式のように反応してCO＋1/2O2＝CO2 に
よる２次燃焼が行われる。Region B: The oxygen gas discharged in the substantially horizontal direction in the region A reacts according to the following equation, and secondary combustion is performed by CO + 1 / 2O 2 = CO 2 .
【００２２】Ｃ領域：精錬用酸素ガスジェットが溶融鉄
浴面に向かって吹き付けられる。Region C: A refining oxygen gas jet is blown toward the molten iron bath surface.
【００２３】Ｄ領域：中心孔が設けられており、中心部
での動圧低下による地金付着防止によりノズル寿命向上
の効果が発揮される。Region D: A center hole is provided, and the effect of improving the life of the nozzle is exhibited by preventing adhesion of the base metal due to a decrease in the dynamic pressure at the center.
【００２４】このように、この発明によりＡ領域でのラ
ンス外側 180度領域の少なくとも一部におけるＲを適切
な値とすることにより、精錬特性、耐火物寿命に影響を
及ぼさずに、吹錬中に炉口の地金溶解が可能となった。As described above, according to the present invention, by setting R to an appropriate value in at least a part of the 180-degree region outside the lance in the region A, the refining characteristics and the life of the refractory can be reduced without affecting the refining characteristics. The melting of the metal at the furnace opening became possible.
【００２５】ここに、この発明によれば、上記曲率半径
Ｒは、２〜30mmに制限される。Ｒ＜２mmでは所期の目的
が達成されず、一方Ｒ＞30mmでは耐火物の溶損が甚だし
くなる。好ましくは、Ｒ＝５〜20mmである。次に、実施
例によってこの発明の作用効果をさらに具体的に説明す
る。[0025] Here, according to the inventions, the radius of curvature R is limited to 2 to 30 mm. At R <2 mm, the intended purpose is not achieved, while at R> 30 mm, refractory erosion becomes severe . Good Mashiku is R = 5 to 20 mm. Next, the operation and effect of the present invention will be described more specifically with reference to examples.
【００２６】[0026]
【実施例】本例では、図１および表１に示す形状および
寸法のランスノズルを用い、250トン転炉において、約3
30 チャージの酸素精錬の試験を行った。円周配置の６
ヶのすべてのノズル吐出孔のランス外側 180度の領域の
全域にわたって曲率 (Ｒ＝12＆15mm) が設けられた。な
お、従来例のランスノズル形状は曲率を付与していない
以外は、図１および表１と同様であった。結果は、表２
ないし表３および図３ないし図５にグラフで示す。EXAMPLE In this example, a lance nozzle having the shape and dimensions shown in FIG.
A 30 charge oxygen refining test was performed. 6 of circumferential arrangement
A curvature (R = 12 & 15 mm) was provided over the entire 180-degree area outside the lance of all the nozzle discharge holes. The lance nozzle shape of the conventional example was the same as FIG. 1 and Table 1 except that no curvature was given. Table 2 shows the results.
3 to 5 and graphs in FIGS.
【００２７】(1) 精錬特性 図３〜５に示す通り、精錬特性はＲ付きランスノズルと
従来ランスノズルで差はない。(1) Refining characteristics As shown in FIGS. 3 to 5, there is no difference in the refining characteristics between the R lance nozzle and the conventional lance nozzle.
【００２８】(2) 転炉耐火物溶損 ランスノズルの影響を受ける転炉レンガ10段〜40段での
レンガ溶損速度を測定した。結果は表２に示すが、これ
からも分かるように、本発明例のレンガ溶損速度は、従
来例とほぼ同様である。(2) Blast furnace refractory erosion The brick erosion rate at 10 to 40 converter bricks affected by the lance nozzle was measured. The results are shown in Table 2, and as can be seen, the brick erosion rate of the present invention example is almost the same as the conventional example.
【００２９】(3) ２次燃焼率と炉口地金切り 表３に２次燃焼率と、炉口地金切り頻度を示す (炉口地
金切りは、操業に支障をきたすと目視で判断したとき
に、オペレータが手動で酸素ガスにより溶断することを
言う) 。(3) Secondary Burning Rate and Furnace Metal Cutting Table 3 shows the secondary burning rate and the frequency of furnace metal cutting (it is visually judged that furnace metal cutting will hinder the operation. When the operator manually blows the oxygen gas.)
【００３０】表３の結果からも分かるように、２次燃焼
率は約１％上昇し、これが効率よく炉口地金を溶解し、
炉口地金切り頻度はほゞ1/10にまで激減した。As can be seen from the results shown in Table 3, the secondary combustion rate increased by about 1%, which efficiently melted the furnace mouth metal.
Furnace slab cutting frequency decreased to about 1/10.
【００３１】[0031]
【表１】 [Table 1]
【００３２】[0032]
【表２】 [Table 2]
【００３３】[0033]
【発明の効果】以上説明してきたように、この発明によ
れば、転炉ランスノズルの出口部外側180度の領域の少
なくとも１部に曲率Ｒ(5〜20mm) を付与することで、次
のような実用上優れた効果が得られる。As described above, according to the present invention, the curvature R (5 to 20 mm) is imparted to at least a part of the 180-degree area outside the outlet of the converter lance nozzle, whereby the following is obtained. Such a practically excellent effect can be obtained.
【００３４】(i) 炉口地金を吹錬中に溶解させることが
できる。 (ii)精錬特性 (吹止め置きの鋼中酸素濃度、スラグ中T-
Fe、Ｐ分配) に悪影響を及ぼさない。 (iii) ２次燃焼によっても転炉耐火物溶損を促進させな
い。 (iv)弱２次燃焼により、吹錬中に炉口地金を溶解し、非
製鋼時間での炉口地金切り時間を激減できる (平均2.5
分／ch、Tap-Tap 短縮) 。(I) The furnace mouth metal can be melted during blowing. (ii) Refining characteristics (oxygen concentration in steel at blow stop, T-
(Fe, P distribution) is not adversely affected. (iii) The secondary combustion does not promote the erosion of converter refractories. (iv) By weak secondary combustion, the furnace slab metal is melted during blowing and the furnace slab cutting time during non-steel making time can be drastically reduced (average 2.5
Min / ch, Tap-Tap shortened).
【図１】図１(a) はこの発明にかかるランスノズル形状
を示す概略断面図であり、図１(b) はその底面図であ
る。FIG. 1 (a) is a schematic sectional view showing a shape of a lance nozzle according to the present invention, and FIG. 1 (b) is a bottom view thereof.
【図２】この発明にかかるランスから酸素ガスを吹き付
けるときのノズル出口部のガス流れを示す模式的説明図
である。FIG. 2 is a schematic explanatory view showing a gas flow at a nozzle outlet when oxygen gas is blown from a lance according to the present invention.
【図３】実施例で得られた吹止め[C] と鋼中酸素濃度の
関係を示すグラフである。FIG. 3 is a graph showing the relationship between the blow stopper [C] obtained in the example and the oxygen concentration in steel.
【図４】実施例で得られた吹止め[C] とスラグ中T-Feの
関係を示すグラフである。FIG. 4 is a graph showing the relationship between blow stopper [C] obtained in the example and T-Fe in slag.
【図５】実施例で得られたスラグ中T-FeとＰ分配の関係
を示すグラフである。FIG. 5 is a graph showing the relationship between T-Fe and P distribution in slag obtained in an example.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 関 保 大阪府茨木市大字佐保48番地 辰巳工業 株式会社内 (56)参考文献 特開 昭63−176414（ＪＰ，Ａ) 特開 昭63−206420（ＪＰ，Ａ) 実開 昭61−39141（ＪＰ，Ｕ) 実開 昭60−9959（ＪＰ，Ｕ) 特公 昭56−45977（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.6，ＤＢ名) C21C 5/46 102 C21C 7/072 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor: Sekibo, Tatsumi Industry Co., Ltd., 48, Saho, Ibaraki-shi, Osaka (56) References JP-A-63-176414 (JP, A) JP-A-63-206420 ( JP, A) JP-A 61-39141 (JP, U) JP-A 60-9959 (JP, U) JP-B 56-45977 (JP, B2) (58) Fields surveyed (Int. Cl. 6 , (DB name) C21C 5/46 102 C21C 7/072
Claims (3)
錬プロセスにおいて用いる、先端に円周配置の複数ノズ
ルを有する上吹ランスであって、該ノズルのノズル吐出
孔のランス外側 180度の領域の少なくとも一部に２〜30
mmのＲの曲率を付けた、転炉炉内の２次燃焼を促進させ
ることで転炉精錬を行いながら炉口付着地金を溶解させ
る転炉吹錬兼炉口地金溶解用ランス。1. A top blowing lance having a plurality of nozzles arranged circumferentially at a tip thereof, which is used in a refining process of blowing oxygen gas onto a molten metal bath surface, the lance having a 180-degree area outside a lance of a nozzle discharge hole of the nozzle. 2-30 at least partially
A converter blasting lance with a radius of curvature of mm, which promotes secondary combustion in the converter furnace to melt the metal deposited on the furnace port while performing converter refining.
たってＲの曲率を付けた請求項１記載のランス。2. The lance according to claim 1, wherein the curvature of R is provided over the entire 180- degree region outside the lance.
錬プロセスにおいて用いる、先端に円周配置の複数ノズ
ルを有する上吹ランスであって、該ノズルのノズル吐出
孔のランスの 360度の領域の全域にわたって２〜30mmの
Ｒの曲率を付けた、転炉炉内の２次燃焼を促進させるこ
とで転炉精錬を行いながら炉口付着地金を溶解させる転
炉吹錬兼炉口地金溶解用ランス。3. A top blowing lance having a plurality of nozzles arranged circumferentially at a tip thereof, which is used in a refining process of blowing oxygen gas onto a molten metal bath surface, the lance having a 360-degree area of a lance of a nozzle discharge hole of the nozzle. A converter with a radius of curvature of 2 to 30 mm over the entire area, which promotes secondary combustion in the converter furnace to melt the metal adhered to the furnace port while refining the converter while melting the metal at the furnace port. For lance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3712795A JP2917848B2 (en) | 1995-02-24 | 1995-02-24 | Converter blasting and furnace mouth metal melting lance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3712795A JP2917848B2 (en) | 1995-02-24 | 1995-02-24 | Converter blasting and furnace mouth metal melting lance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08232010A JPH08232010A (en) | 1996-09-10 |
| JP2917848B2 true JP2917848B2 (en) | 1999-07-12 |
Family
ID=12488949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3712795A Expired - Fee Related JP2917848B2 (en) | 1995-02-24 | 1995-02-24 | Converter blasting and furnace mouth metal melting lance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2917848B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108642234A (en) * | 2018-07-16 | 2018-10-12 | 辽宁科技大学 | A kind of single channel double structure oxygen lance nozzle and converting process |
-
1995
- 1995-02-24 JP JP3712795A patent/JP2917848B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08232010A (en) | 1996-09-10 |
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