JP3427055B2 - Degassing method and molten steel stirrer in simple degassing equipment for molten steel - Google Patents
Degassing method and molten steel stirrer in simple degassing equipment for molten steelInfo
- Publication number
- JP3427055B2 JP3427055B2 JP2000391174A JP2000391174A JP3427055B2 JP 3427055 B2 JP3427055 B2 JP 3427055B2 JP 2000391174 A JP2000391174 A JP 2000391174A JP 2000391174 A JP2000391174 A JP 2000391174A JP 3427055 B2 JP3427055 B2 JP 3427055B2
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- degassing
- refining vessel
- thrust bearing
- vacuum
- 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
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- Treatment Of Steel In Its Molten State (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は精錬容器内溶鋼の脱ガ
ス処理方法に関するものであり、精錬容器内溶鋼の脱水
素、脱窒素のために上記溶鋼を効率良く撹拌することが
でき、これによって脱ガス効率を高めて脱ガス処理時間
を短縮することができるものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for degassing molten steel in a refining vessel, which can efficiently stir the molten steel for dehydrogenation and denitrification of the molten steel in the refining vessel. It is possible to improve the degassing efficiency and shorten the degassing treatment time.
【０００２】[0002]
【従来の技術】精錬容器内溶鋼の脱ガス処理方法とし
て、噴流式によるもの（特開昭５６−１２３３２０号公
報）、また、溶鋼撹拌方式によるものがある（特開昭６
３−１４００２９号公報、特開昭６３−１８３１１９号
公報）。この発明は上記従来の脱ガス処理方法のうちの
溶鋼撹拌方式によるものであるが、この溶鋼撹拌方式は
真空槽内に引き上げた溶鋼に不活性ガスを吹き込んで上
昇流を生じさせ、この上昇流によって同真空槽内で脱ガ
スを行うものであり、その一例（特開昭６３−１４００
２９号公報のもの）は図１に示すとおりである（以下、
これを「従来技術１」という）。上記従来技術１は、精
錬容器（具体的には取鍋）１内の溶鋼２に、真空槽４下
端の浸漬管（下端を解放したもの）５をスラグ層３の下
方まで浸漬してあり、この真空槽４の下部外周に電磁撹
拌装置８を配置している。また、上記浸漬管５に対向す
る一対のノズルｎを設けてあって、このノズルｎにガス
供給管９を接続している。また、真空槽４の上端に合金
貯蔵層７を設けると共に加減圧用配管６を接続してい
る。加減圧用配管６を真空源に接続して真空槽４内を負
圧にして精錬容器１内の溶鋼２のレベルを真空槽４内に
引上げ、引上げられた溶鋼に電磁撹拌装置８によって水
平方向の旋回力を与えて旋回流を生じさせる。このと
き、ガス供給管９に接続されたノズルｎから多量のアル
ゴンガスを吹き込んで脱ガス処理を行うものである。こ
のものは、上記真空槽４内の溶鋼に強い旋回流を与える
とともに、加減圧用配管６を真空源と加圧源に交互に切
り換えて真空槽４内の減圧、加圧を繰り返して（例え
ば、１３．５秒減圧、１．５秒加圧）真空槽４内溶鋼の
レベルを上下動させて精錬容器内の溶鋼を撹拌するもの
である。また、他の従来技術として図２に示すものがあ
る。このものは真空槽２４の下部２４ａに２つの浸漬管
２５ａ，２５ｂを設け、真空槽２４内の下部２４ａまで
溶鋼を引き上げた状態で浸漬管２５ａ内に不活性ガス
（アルゴンガス）を吹き込んで浸漬管２５ａ内に上昇流
を生じさせ、他方の浸漬管２５ｂから精錬容器１に還流
させることで、縦の循環流を生じさせてこの循環流れで
脱ガスを行うものである（以下これを「従来技術２」と
いう）。2. Description of the Related Art As a method for degassing molten steel in a refining vessel, there are a jet method (Japanese Patent Laid-Open No. 56-123320) and a molten steel stirring method (Japanese Laid-Open Patent Publication No. 6-63).
3-140029, JP-A-63-183119). The present invention is based on the molten steel stirring method of the above conventional degassing treatment methods.This molten steel stirring method blows an inert gas into the molten steel pulled up in the vacuum chamber to generate an upward flow, and the upward flow Degassing is carried out in the same vacuum chamber according to the method described in Japanese Patent Laid-Open No. 63-1400.
No. 29) is as shown in FIG. 1 (hereinafter,
This is called "Prior Art 1". In the above-mentioned conventional technique 1, a molten steel 2 in a refining vessel (specifically, a ladle) 1 is immersed in a dipping pipe 5 (having a lower end opened) 5 at a lower end of a vacuum tank 4 to a position below a slag layer 3, An electromagnetic stirring device 8 is arranged on the outer periphery of the lower portion of the vacuum chamber 4. Further, a pair of nozzles n facing the immersion pipe 5 is provided, and the gas supply pipe 9 is connected to the nozzles n. Further, the alloy storage layer 7 is provided on the upper end of the vacuum chamber 4 and the pressurizing / depressurizing pipe 6 is connected thereto. By connecting the pressurizing / depressurizing pipe 6 to a vacuum source and making the inside of the vacuum tank 4 a negative pressure, the level of the molten steel 2 in the refining vessel 1 is raised into the vacuum tank 4, and the pulled molten steel is horizontally moved by the electromagnetic stirring device 8. To generate a swirling flow. At this time, a large amount of argon gas is blown from the nozzle n connected to the gas supply pipe 9 to perform the degassing process. This one gives a strong swirl flow to the molten steel in the vacuum tank 4 and alternately switches the pressurizing / depressurizing pipe 6 to a vacuum source and a pressurizing source to repeat depressurization and pressurization in the vacuum tank 4 (for example, (Depressurization for 13.5 seconds, pressurization for 1.5 seconds) The level of the molten steel in the vacuum tank 4 is moved up and down to stir the molten steel in the refining vessel. Another conventional technique is shown in FIG. In this case, two immersion pipes 25a and 25b are provided in the lower portion 24a of the vacuum chamber 24, and the molten steel is pulled up to the lower portion 24a in the vacuum chamber 24, and an inert gas (argon gas) is blown into the immersion pipe 25a for immersion. By generating an ascending flow in the pipe 25a and returning it from the other dipping pipe 25b to the refining vessel 1, a vertical circulation flow is generated and degassing is performed by this circulation flow (hereinafter referred to as "conventional"). Technology 2 ”).
【０００３】以上の従来技術１、従来技術２のいずれも
不活性ガスを吹き込んでその上昇力で溶鋼に上昇流を生
じさせるものであるが、所要の脱ガス能率を確保するた
めには多量の不活性ガスを吹き込むことが必要である。
また、従来技術１は、精錬容器１内の溶鋼の撹拌を真空
槽４内で溶鋼レベルを上下動させるものであるが、脱ガ
ス処理を行いながら真空槽４内の真空度を短時間で大幅
に変動させる（例えば１０秒間で真空槽４内の溶鋼レベ
ルを０ｍから１ｍまで引き上げるとしてもこの間の真空
度の変動は極めて大きい）ことが容易でなく、そのため
の設備は極めて大掛かりなものにならざるを得ない。ま
た、上記従来技術２は、不活性ガスによる上昇流によっ
て精錬容器１内の溶鋼を撹拌して脱ガスするものである
が、２つの浸漬管２５ａ，２５ｂを浸漬するものである
から、この浸漬管の内径が小径に成らざるを得ない（例
えば内径ｄが５００〜８００ｍｍ，外形Ｄが１０００〜
１３００ｍｍ）。他方、所定の能率で脱ガスを行うため
に必要な循環流量を確保するために、上記上昇流の流速
をかなり高速にせざるを得ない。このために浸漬管２５
ａ，２５ｂ内面が溶鋼との摩擦により早期に摩耗するの
で耐久性が劣る。Both the prior art 1 and the prior art 2 described above blow an inert gas to generate an ascending flow in the molten steel by the ascending force, but in order to secure the required degassing efficiency, a large amount of gas is required. It is necessary to blow in an inert gas.
Further, in the prior art 1, stirring of molten steel in the refining vessel 1 is performed to move the molten steel level up and down in the vacuum tank 4, but the degree of vacuum in the vacuum tank 4 can be greatly increased in a short time while performing degassing. (For example, even if the molten steel level in the vacuum chamber 4 is raised from 0 m to 1 m in 10 seconds, the fluctuation of the vacuum degree during this period is extremely large.) It is not easy, and the equipment therefor becomes extremely large. I don't get. Further, the above-mentioned conventional technique 2 stirs and degasses the molten steel in the refining vessel 1 by the upward flow of the inert gas, but since it dips the two dipping pipes 25a and 25b, this dipping The inner diameter of the pipe must be small (for example, inner diameter d is 500 to 800 mm, outer diameter D is 1000 to
1300 mm). On the other hand, in order to secure the circulation flow rate required for degassing at a predetermined efficiency, the flow velocity of the ascending flow has to be made considerably high. For this purpose dip tube 25
Since the inner surfaces of a and 25b are worn early due to friction with molten steel, durability is poor.
【０００４】[0004]
【解決しようとする課題】そこで、この発明は、真空槽
内の溶鋼を積極的に縦に撹拌することで、真空槽内の溶
鋼の同真空槽壁面に対する流速を速くすることなしに精
練容器内溶鋼の撹拌及び脱ガス機能を向上させられるよ
うに、溶鋼撹拌方法を工夫することをその課題とするも
のである。Therefore, according to the present invention, by positively stirring the molten steel in the vacuum tank vertically, the molten steel in the vacuum tank can be stirred in the refining vessel without increasing the flow velocity with respect to the wall surface of the vacuum tank. It is an object to devise a molten steel stirring method so that the stirring and degassing functions of molten steel can be improved.
【０００５】[0005]
【解決手段１】上記課題解決のための解決手段１は、精
錬容器内の溶鋼に真空槽下端の浸漬管を浸漬し、真空槽
によって溶鋼の脱ガスを行う溶鋼簡易脱ガス設備におけ
る脱ガス処理方法を前提として、次の（イ）（ロ）によ
って構成されるものである。
（イ）上記精錬容器の底にインペラを設け、上記精錬容
器を旋回させて、溶鋼に中心から半径方向外側への流れ
を生じさせること、（ロ）真空槽の浸漬管を容器に浅く
浸漬させ、真空槽を真空源によって負圧にして、上記イ
ンペラの回転と真空槽内真空によって溶鋼に縦の流れを
作り、縦の循環流を起こして溶鋼を撹拌すること。な
お、上記の「真空槽の浸漬管を容器に浅く浸漬させ」
は、浸漬深さが従来技術の場合のほぼ２／３程度である
ことを意味する。SOLUTION 1 For solving the above-mentioned problems, a degassing process in a molten steel simple degassing equipment in which a dipping pipe at the lower end of a vacuum tank is immersed in molten steel in a refining vessel and the molten steel is degassed by the vacuum tank. Based on the method, it is composed of the following (a) and (b). (A) An impeller is provided at the bottom of the refining vessel, and the refining vessel is swirled to cause the molten steel to flow radially outward from the center. (B) The immersion pipe of the vacuum tank is shallowly immersed in the vessel. The vacuum tank is made to have a negative pressure by a vacuum source, a vertical flow is generated in the molten steel by the rotation of the impeller and the vacuum in the vacuum tank, and a vertical circulating flow is generated to stir the molten steel. It should be noted that the above "dip the immersion tube of the vacuum tank into the container shallowly"
Means that the immersion depth is about 2/3 of that in the case of the conventional technique.
【０００６】[0006]
【作用】底にインペラを設けた精錬容器を旋回させる
と、インペラによって精錬容器底部の溶鋼が中央部から
半径方向外方に流れ、精錬容器の内壁面に当たり、当該
内壁面に沿って上昇し、真空槽内真空によって浸漬管に
引き上げられ、再び中央部から下降して精錬容器底部に
沿って半径方向外方に流れる。この縦の循環流によって
当該浸漬管内の溶鋼が積極的に縦に撹拌されるから、真
空槽内の高い真空度によって能率的に脱ガスが行われ
る。そして、上記循環流は精錬容器内の溶鋼全体を撹拌
するので、精練容器内の溶鋼全体の脱ガスが均等に推進
される。また、真空槽内はほぼ一定の真空度に継続して
維持されるから、真空槽内の圧力を変動させてその溶鋼
レベルを上下動させる方式などに比して、脱ガス能率が
各段に優れている。さらに、上記従来技術２に比して浸
漬管の内径は２倍程度になるので、所要の縦の循環流量
を確保するために必要な循環流速は従来技術２における
循環流速の１／４〜１／３程度に止まるので、溶鋼の上
昇流による浸漬管内壁面の摩耗は極めて少ない。When the refining vessel having an impeller at the bottom is turned, the molten steel at the bottom of the refining vessel flows radially outward from the central portion by the impeller, hits the inner wall surface of the refining vessel, and rises along the inner wall surface. It is pulled up to the dip tube by the vacuum in the vacuum tank, descends again from the central part, and flows radially outward along the bottom part of the refining vessel. Since the molten steel in the dip pipe is positively stirred vertically by this vertical circulation flow, degassing is efficiently performed by the high vacuum degree in the vacuum chamber. The circulating flow stirs the entire molten steel in the refining vessel, so that the degassing of the entire molten steel in the refining vessel is uniformly promoted. In addition, since the vacuum chamber is maintained at a substantially constant degree of vacuum, the degassing efficiency is higher than that of the system in which the pressure in the vacuum chamber is changed to move the molten steel level up and down. Are better. Furthermore, since the inner diameter of the immersion pipe is about twice as large as that in the above-mentioned Prior Art 2, the circulation flow rate required to secure the required vertical circulation flow rate is 1/4 to 1 of the circulation flow rate in Prior Art 2. Since it stops at about ⅓, wear of the inner wall surface of the dipping pipe due to the rising flow of molten steel is extremely small.
【０００７】[0007]
【実施態様１】この実施態様１は上記精錬容器の旋回速
度が１０回以下／分で、真空槽内溶鋼に流速０．１〜
０．２ｍ／秒の縦の循環流を生じさせるようにしたこと
でる。[Embodiment 1] In Embodiment 1, the smelting speed of the refining vessel is 10 times or less / minute, and the flow rate of molten steel in a vacuum tank is 0.1 to 0.1 times.
A vertical circulation flow of 0.2 m / sec is generated.
【作用】精錬容器の旋回に伴って、溶鋼が精錬容器の底
のインペラによって縦に循環されるが、精錬容器の旋回
速度が１０回以下／分で、真空槽内の溶鋼に流速０．１
〜０．２ｍ／秒の縦の循環流を生じさせるようにしたこ
とにより、真空槽内の溶鋼の真空槽内面に対する流速を
当該内面の摩耗が抑制される程度に止めつつ、脱ガス効
率を可及的に高くすることができる。The molten steel is vertically circulated by the impeller at the bottom of the refining container as the refining container swirls. The swirling speed of the refining container is 10 times or less / minute, and the flow rate of the molten steel is 0.1 in the vacuum tank.
By generating a vertical circulation flow of up to 0.2 m / sec, the degassing efficiency is improved while the flow velocity of the molten steel in the vacuum chamber with respect to the inner surface of the vacuum chamber is stopped to such an extent that abrasion of the inner surface is suppressed. It can be as high as possible.
【０００８】[0008]
【解決手段２】上記課題解決のための解決手段２は、精
錬容器内の溶鋼に、下端を解放した真空槽下端の浸漬管
を浅く浸漬して当該真空槽を減圧して脱ガスを行う溶鋼
簡易脱ガス設備における脱ガス処理装置を前提として、
次の（イ）（ロ）によって構成されるものである。
（イ）上記精錬容器をスラスト軸受で旋回自在に支持さ
せ、これを駆動装置で旋回駆動するようにしたこと、
（ロ）上記精錬容器の底にインペラを設けたこと。SOLUTION 2 For solving the above-mentioned problems, a molten steel for degassing by immersing a dipping pipe at the lower end of a vacuum tank whose lower end is opened in a molten steel in a refining container is shallowly depressurized and degassing the vacuum tank. Assuming a degassing treatment device in a simple degassing facility,
It is composed of the following (a) and (b). (A) The refining vessel is rotatably supported by a thrust bearing, and is driven by a drive device.
(B) An impeller is provided at the bottom of the refining vessel.
【０００９】[0009]
【作用】この解決手段２によって解決手段１の脱ガス処
理方法を効果的に実施することができる。With this solving means 2, the degassing method of the solving means 1 can be effectively implemented.
【００１０】[0010]
【実施態様１】実施態様１は、台車の荷台上にスラスト
軸受を設け、当該スラスト軸受で精錬容器（具体的には
取鍋）を旋回自在に支持させ、スラスト軸受を駆動装置
で旋回駆動するようにしたことである。[Embodiment 1] In Embodiment 1, a thrust bearing is provided on a carrier of a bogie, a refining vessel (specifically, a ladle) is rotatably supported by the thrust bearing, and the thrust bearing is rotatably driven by a drive device. That's what I did.
【作用】精錬容器を台車に載せたままで当該精錬容器内
の溶鋼に上記浸漬管を浅く浸漬させ、精錬容器を台車上
で旋回させることができるので、解決手段１の脱ガス処
理作業を極めて能率的に行うことができる。[Operation] Since the refining vessel can be swung on the bogie while the refining vessel is still mounted on the trolley, the molten steel in the refining vessel can be shallowly immersed in the molten steel, so that the degassing process of the solution means 1 is extremely efficient. Can be done on a regular basis.
【００１１】[0011]
【実施態様２】この実施態様２は、上記精錬容器を支持
するスラスト軸受の下方に減速機及び駆動モータを設
け、スラスト軸受のリングギヤを上記減速機の駆動ピニ
オンで駆動するようにしたことである。Embodiment 2 In Embodiment 2, a speed reducer and a drive motor are provided below a thrust bearing supporting the refining vessel, and a ring gear of the thrust bearing is driven by a drive pinion of the speed reducer. .
【作用】スラスト軸受の下方に減速機及び駆動モータを
設け、これで直接スラスト軸受を旋回駆動するものであ
るから、精練容器の旋回駆動装置の機構を単純にするこ
とができる。Since the speed reducer and the drive motor are provided below the thrust bearing, and the thrust bearing is directly swung by this, the mechanism of the swirling drive device for the scouring vessel can be simplified.
【００１２】[0012]
【実施態様３】実施態様３は、上記スラスト軸受の上面
に断熱板を介在させたことである。Embodiment 3 Embodiment 3 is that a heat insulating plate is interposed on the upper surface of the thrust bearing.
【作用】精練容器の底外面は高温に熱せられているが、
スラスト軸受の上面との間に断熱板（例えば多孔性セラ
ミック板など）を介在させたことで、スラスト軸受、当
該スラスト軸受の下方に配置した駆動装置への熱的影響
が低減される。[Operation] The outer surface of the bottom of the scouring container is heated to a high temperature,
By interposing a heat insulating plate (for example, a porous ceramic plate) between the upper surface of the thrust bearing and the upper surface of the thrust bearing, the thermal influence on the thrust bearing and the drive device arranged below the thrust bearing is reduced.
【００１３】[0013]
【実施の形態】次いで、図面を参照しつつ実施の形態に
ついて説明する。この実施の形態は、容量２００トンの
取鍋（精錬容器）１を用いて溶鋼の脱ガスを行う例であ
り、真空槽１０の本体部１１の下端にフランジ継ぎ手１
２によって浸漬管１３を取外自在に取付けてあり、ま
た、本体部１１の上端をフランジ継ぎ手１４を介して上
部１５に連結している。この上部１５は真空源に連通
し、また、その上端にランス孔１６があって、ランス１
７がシールされた状態で上下動可能に挿入されている。
このランス１７を設けることは脱ガス処理装置において
従来周知のことであるが、このランス１７の下端は真空
槽１０の下部の浸漬管１３内の溶鋼レベルの直ぐ上方ま
で達している。浸漬管１３は鉄製心材１３ｘからリブ材
を半径方向内外に突設し、このリブを包み込むようにし
てセメント層１３ｙを積層し、これを焼成して硬化させ
て製作されたものであり、内径が２５００ｍｍ，外径が
３５００ｍｍの筒体である。取鍋１を運搬する台車２０
の荷台２１にスラスト軸受（旋回軸受）２３を設けてあ
る。したがって、取鍋１を台車２０に載せると、取鍋１
はスラスト軸受２３により旋回可能に支持される。スラ
スト軸受２３と荷台２１との間に駆動モータ２４が介在
していて、この駆動モータ２４によって減速機（この例
では駆動モータに内蔵）を介してスラスト軸受の上板に
設けたリングギア２２を駆動するようにしている。これ
によって取鍋１が１０回／分の速度で駆動される。取鍋
１に２００トンの溶鋼を入れて台車２０の荷台２１に載
せたままで、真空槽１０を降下させて取鍋１の溶鋼のレ
ベルから１０００ｍｍ程度の深さまで浸漬管１３を浸漬
させる。このとき真空槽１０内は真空源によって高真空
（例えば略０．０５トール）で吸引され、その中に高さ
１１００〜１４００ｍｍまで溶鋼レベルが引き上げら
れ、この状態が継続して維持される。この状態で取鍋１
を毎分１０回で旋回させると、取鍋の底のインペラ１ａ
によって真空槽１０内の溶鋼に流速が略０．２ｍ／秒の
縦の循環流が生じて上下方向に撹拌される。この循環流
は取鍋１の底まで達し、底部から真空槽１０内の溶鋼の
上部まで循環する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments will be described with reference to the drawings. This embodiment is an example of degassing molten steel using a ladle (refining vessel) 1 having a capacity of 200 tons, and a flange joint 1 is attached to a lower end of a main body 11 of a vacuum chamber 10.
The dip pipe 13 is detachably attached by means of 2, and the upper end of the main body 11 is connected to the upper part 15 via a flange joint 14. This upper part 15 communicates with a vacuum source, and has a lance hole 16 at its upper end,
7 is inserted in a vertically movable manner in a sealed state.
The provision of this lance 17 is well known in the conventional degassing apparatus, but the lower end of this lance 17 reaches just above the molten steel level in the dip tube 13 below the vacuum chamber 10. The dip tube 13 is manufactured by projecting rib materials from the iron core material 13x inward and outward in the radial direction, laminating a cement layer 13y so as to wrap around the ribs, and firing and curing the cement layer 13y. It is a cylindrical body having an outer diameter of 2500 mm and an outer diameter of 3500 mm. A dolly 20 that carries the ladle 1.
A thrust bearing (slewing bearing) 23 is provided on the carrier 21. Therefore, when ladle 1 is placed on trolley 20, ladle 1
Is rotatably supported by a thrust bearing 23. A drive motor 24 is interposed between the thrust bearing 23 and the bed 21, and the ring gear 22 provided on the upper plate of the thrust bearing is driven by the drive motor 24 via a speed reducer (in this example, the drive motor is incorporated). I'm trying to drive. As a result, the ladle 1 is driven at a speed of 10 times / minute. With 200 tons of molten steel placed in the ladle 1 and being placed on the carrier 21 of the carriage 20, the vacuum chamber 10 is lowered to immerse the dipping pipe 13 from the molten steel level of the ladle 1 to a depth of about 1000 mm. At this time, the inside of the vacuum chamber 10 is sucked by a vacuum source in a high vacuum (for example, about 0.05 torr), the molten steel level is raised to a height of 1100-1400 mm, and this state is continuously maintained. Ladle 1 in this state
Swiveling at 10 times per minute, the impeller 1a at the bottom of the ladle
As a result, a vertical circulating flow having a flow velocity of approximately 0.2 m / sec is generated in the molten steel in the vacuum tank 10 and is stirred in the vertical direction. This circulating flow reaches the bottom of the ladle 1 and circulates from the bottom to the top of the molten steel in the vacuum chamber 10.
【００１４】[0014]
【発明の効果】以上述べたように、この発明は、精錬容
器の底にインペラを設け、精錬容器を旋回させて上記イ
ンペラにより精錬容器内の溶鋼に縦の循環流を生じさ
せ、この縦の循環流により脱ガスを促進するものである
から、特に不活性ガスを吹き込む必要はなく、また、溶
鋼の真空槽１０内壁面等に対する流速を従来のものに比
して著しく低く抑えることができる。したがって、溶鋼
との摩擦による耐火物壁面の摩耗損傷を低減することが
でき、その耐久性を著しく向上させることができる。ま
た、精練容器を旋回させ、精錬容器の底のインペラによ
って溶鋼に縦の循環流を生じさせるものであるから、縦
の循環流を生じさせるための装置が比較的簡便であり、
前記の従来技術１、従来技術２に記載されたものに比し
て脱ガス処理装置の製作コスト及び脱ガス処理装置の運
転コストを大幅に低減することができる。As described above, according to the present invention, the impeller is provided at the bottom of the refining vessel, the refining vessel is swung, and a vertical circulation flow is generated in the molten steel in the refining vessel by the impeller. Since the degassing is promoted by the circulating flow, it is not necessary to blow an inert gas in particular, and the flow velocity of the molten steel to the inner wall surface of the vacuum chamber 10 can be suppressed to be significantly lower than that of the conventional one. Therefore, it is possible to reduce the abrasion damage of the wall surface of the refractory material due to the friction with the molten steel, and it is possible to remarkably improve the durability. Further, since the refining vessel is swirled and a vertical circulating flow is generated in the molten steel by the impeller at the bottom of the refining vessel, the device for producing the vertical circulating flow is relatively simple,
It is possible to significantly reduce the manufacturing cost of the degassing apparatus and the operating cost of the degassing apparatus as compared with those described in the above-mentioned Conventional Techniques 1 and 2.
【図１】は従来の脱ガス処理装置の模式断面図である。FIG. 1 is a schematic sectional view of a conventional degassing apparatus.
【図２】は他の従来の脱ガス処理装置の模式断面図であ
る。FIG. 2 is a schematic sectional view of another conventional degassing apparatus.
【図３】（ａ）は実施例の模式断面図であり、（ｂ）は
図（ａ）の矢視Ａ−Ａ図である。FIG. 3A is a schematic cross-sectional view of the embodiment, and FIG. 3B is a view taken along the line AA of FIG.
【図４】（ａ）は図３の矢視Ａ−Ａ図であり、（ｂ）は
図２の要部縦断面図である。4A is a view taken along the line AA of FIG. 3, and FIG. 4B is a vertical cross-sectional view of a main part of FIG.
１：取鍋（精錬容器） １ａ：インペラ １０：真空槽 １１：真空槽の本体部 １２，１４：フランジ継ぎ手 １３：浸漬管 １３ｘ：鉄製心材 １３ｙ：セメント層 １５：真空槽の上部 １６：ランス孔 １７：ランス ２０：台車 ２１：台車の荷台 ２２：リングギア ２３：スラスト軸受 ２４：駆動モータ 1: Ladle (refining container) 1a: Impeller 10: Vacuum tank 11: Main body of vacuum chamber 12, 14: Flange joint 13: Immersion tube 13x: Iron core material 13y: cement layer 15: Upper part of vacuum chamber 16: Lance hole 17: Lance 20: trolley 21: Cart carrier 22: Ring gear 23: Thrust bearing 24: Drive motor
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開2000−192131（ＪＰ，Ａ) 特開 平５−247521（ＪＰ，Ａ) 特開2002−194420（ＪＰ，Ａ) 特開 昭61−73815（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C21C 7/10 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 2000-192131 (JP, A) JP 5-247521 (JP, A) JP 2002-194420 (JP, A) JP 61-73815 ( (58) Fields surveyed (Int.Cl. 7 , DB name) C21C 7/10
Claims (6)
浸漬し、真空槽によって溶鋼の脱ガスを行う溶鋼簡易脱
ガス設備における脱ガス処理方法において、 上記精錬容器の底にインペラを設け、上記精錬容器を旋
回させて、溶鋼に中心から外側の流れを作り、 上記真空槽の浸漬管を容器に浅く浸漬させ、真空槽を真
空源によって負圧にして、上記インペラの回転と真空槽
内真空によって溶鋼に縦の流れを作り、縦の循環流を起
こさせて溶鋼を撹拌する脱ガス処理方法。1. A degassing treatment method in a simple molten steel degassing facility in which a dipping pipe at the lower end of a vacuum tank is immersed in molten steel in a refining vessel, and an impeller is provided at the bottom of the refining vessel. Provide, swirl the refining vessel to create a flow from the center to the outside in the molten steel, dip the immersion tube of the vacuum tank into the vessel shallowly, make the vacuum tank a negative pressure with a vacuum source, and rotate the impeller and vacuum. A degassing method in which a vertical flow is generated in molten steel by a vacuum in the tank and a vertical circulating flow is generated to stir the molten steel.
で、真空槽内溶鋼に流速０．１〜０．２ｍ／秒の縦の循
環流を生じさせるようにした請求項１の脱ガス処理方
法。2. The degassing method according to claim 1, wherein the smelting vessel has a swirling speed of 10 times or less / minute, and a vertical circulating flow having a flow rate of 0.1 to 0.2 m / sec is generated in the molten steel in the vacuum tank. Gas treatment method.
下端の浸漬管を浅く浸漬して、当該真空槽を減圧して脱
ガスを行う溶鋼簡易脱ガス設備における脱ガス処理装置
において、 上記精錬容器をスラスト軸受で旋回自在に支持させ、こ
れを駆動装置で旋回駆動するようにし、 上記精錬容器の底にインペラを設けた、溶鋼簡易脱ガス
設備における溶鋼撹拌装置。3. A degassing treatment apparatus in a molten steel simple degassing equipment for degassing by depressurizing the vacuum tank by immersing a dipping pipe at the lower end of a vacuum tank, the lower end of which is opened, into the molten steel in a refining vessel. A molten steel stirrer in a molten steel simple degassing facility, wherein the refining vessel is supported by a thrust bearing so as to be swingable, and is driven by a drive device to swing, and an impeller is provided at the bottom of the refining vessel.
スラスト軸受で精錬容器を旋回自在に支持させ、スラス
ト軸受を駆動装置で旋回駆動するようにした請求項３の
溶鋼撹拌装置。4. A molten steel stirring device according to claim 3, wherein a thrust bearing is provided on the carrier of the truck, the refining vessel is supported by the thrust bearing so as to be rotatable, and the thrust bearing is swung by a drive device.
方に減速機及び駆動モータを設け、スラスト軸受のリン
グギヤを上記減速機の駆動ピニオンで駆動するようにし
た請求項４の溶鋼撹拌装置。5. A molten steel stirring device according to claim 4, wherein a speed reducer and a drive motor are provided below a thrust bearing supporting said refining vessel, and a ring gear of the thrust bearing is driven by a drive pinion of said speed reducer.
受の上面に断熱版を介在させた溶鋼撹拌装置。6. A molten steel stirrer in which a heat insulating plate is interposed on the upper surface of the thrust bearing according to any one of claims 3 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000391174A JP3427055B2 (en) | 2000-12-22 | 2000-12-22 | Degassing method and molten steel stirrer in simple degassing equipment for molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000391174A JP3427055B2 (en) | 2000-12-22 | 2000-12-22 | Degassing method and molten steel stirrer in simple degassing equipment for molten steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002194421A JP2002194421A (en) | 2002-07-10 |
| JP3427055B2 true JP3427055B2 (en) | 2003-07-14 |
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ID=18857380
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000391174A Expired - Fee Related JP3427055B2 (en) | 2000-12-22 | 2000-12-22 | Degassing method and molten steel stirrer in simple degassing equipment for molten steel |
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| Country | Link |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7858020B2 (en) | 2008-03-14 | 2010-12-28 | Thut Bruno H | Molten metal flow powered degassing device |
| KR101701982B1 (en) * | 2015-10-30 | 2017-02-02 | 주식회사 포스코 | Refining facilities and method |
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2000
- 2000-12-22 JP JP2000391174A patent/JP3427055B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002194421A (en) | 2002-07-10 |
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