JPH05156342A - Circulating type vacuum degassing apparatus - Google Patents
Circulating type vacuum degassing apparatusInfo
- Publication number
- JPH05156342A JPH05156342A JP32043291A JP32043291A JPH05156342A JP H05156342 A JPH05156342 A JP H05156342A JP 32043291 A JP32043291 A JP 32043291A JP 32043291 A JP32043291 A JP 32043291A JP H05156342 A JPH05156342 A JP H05156342A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- degassing
- tank
- degassing tank
- pipe
- 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
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、脱ガス槽内でのスプラ
ッシュ発生による槽内への地金付着を低減すると共に、
槽内溶鋼の攪拌を促進することができる環流式真空脱ガ
ス装置に関するものであるBACKGROUND OF THE INVENTION The present invention reduces the adhesion of metal to the inside of a degassing tank due to splash generation in the tank, and
The present invention relates to a reflux type vacuum degassing device capable of promoting stirring of molten steel in a tank.
【０００２】[0002]
【従来の技術】一般に図２に示すように、環流式脱ガス
装置の真空脱ガス槽10は上蓋１、上部槽４、中部槽５お
よび下部槽６より形成され、上部槽４は排気口２に接続
される一方、下部槽６の底部に溶鋼の上昇管７ａおよび
下降管８ａがそれぞれ鉛直に設けられている。そして上
昇管７ａおよび下降管８ａは真空脱ガス槽10の下方に配
置された取鍋11内の溶鋼９中に浸漬されている。また溶
鋼の上昇管７ａにはガス吹込管12が設けられており、こ
のガス吹込管12を通してアルゴンガスなどの不活性ガス
が上昇管７ａ内に導入される。なお、３は脱ガス槽10内
を加熱するための加熱電極棒を示す。2. Description of the Related Art Generally, as shown in FIG. 2, a vacuum degassing tank 10 of a reflux type degassing apparatus is composed of an upper lid 1, an upper tank 4, a middle tank 5 and a lower tank 6, and the upper tank 4 is an exhaust port 2. On the other hand, an ascending pipe 7a and a descending pipe 8a of molten steel are vertically provided at the bottom of the lower tank 6. The ascending pipe 7a and the descending pipe 8a are immersed in the molten steel 9 in the ladle 11 arranged below the vacuum degassing tank 10. A gas blowing pipe 12 is provided in the molten steel rising pipe 7a, and an inert gas such as argon gas is introduced into the rising pipe 7a through the gas blowing pipe 12. Reference numeral 3 denotes a heating electrode rod for heating the inside of the degassing tank 10.
【０００３】このような環流式真空脱ガス装置による溶
鋼の真空脱ガス処理に際しては、まず上昇管７ａおよび
下降管８ａを取鍋11内の溶鋼９中に浸漬してから真空脱
ガス槽10内を排気口２を介して排気すると、溶鋼９は大
気圧相当の溶鋼高さ（約 1.5ｍ）まで脱ガス槽10内に上
昇することになる。このとき上昇管７ａ内にガス吹込管
12を通して不活性ガスを導入するとエアリフトの原理に
よって溶鋼９の上昇が起り、脱ガス槽10内に溶鋼９が流
入し、ここで溶鋼９が真空脱ガスされた後、槽内に溜っ
た溶鋼９は自重によって下降管８ａを通って取鍋11内に
環流する。このような溶鋼９の環流が連続的に繰り返さ
れることによって溶鋼９からの脱ガスが進行する。In the vacuum degassing process of molten steel by such a reflux type vacuum degassing apparatus, first, the ascending pipe 7a and the descending pipe 8a are immersed in the molten steel 9 in the ladle 11 and then in the vacuum degassing tank 10. When the gas is exhausted through the exhaust port 2, the molten steel 9 rises into the degassing tank 10 up to the molten steel height equivalent to the atmospheric pressure (about 1.5 m). At this time, a gas injection pipe is installed in the rising pipe 7a.
When the inert gas is introduced through 12, the molten steel 9 rises due to the principle of air lift, the molten steel 9 flows into the degassing tank 10, where the molten steel 9 is vacuum degassed, and then the molten steel 9 accumulated in the tank. Circulates in the ladle 11 by its own weight through the downcomer 8a. Degassing from the molten steel 9 proceeds by continuously repeating such a circulation of the molten steel 9.
【０００４】前述のようにエアリフトの原理により溶鋼
９が上昇管７ａ内を上昇して脱ガス槽10内に流入する際
に、溶鋼９のスプラッシュが発生するが、上昇管７ａが
鉛直に設けられているため必然的にスプラッシュは鉛直
方向に飛散するものが多くなる。このため図３に示すよ
うに溶鋼９のスプラッシュは脱ガス槽10の上端部にある
上蓋１にまで達し、加熱電極棒３の部分を除く上蓋１か
ら中部槽５にかけて地金13が付着することになる。As described above, when the molten steel 9 rises in the rising pipe 7a and flows into the degassing tank 10 by the principle of the air lift, a splash of the molten steel 9 occurs, but the rising pipe 7a is provided vertically. Inevitably, many splashes are scattered in the vertical direction. Therefore, as shown in FIG. 3, the splash of molten steel 9 reaches the upper lid 1 at the upper end of the degassing tank 10, and the metal 13 adheres from the upper lid 1 excluding the portion of the heating electrode rod 3 to the middle tank 5. become.
【０００５】このようにして脱ガス槽10内に付着した地
金13が自重により落下すると、脱ガス処理中の溶鋼９が
成分の異なる地金13により汚染され、溶鋼成分を狂わせ
ることになる。時には落下する地金13により加熱電極棒
３を切損するといったトラブルを生じることにもなる。
さらには付着した地金13が生成して大きくなると、つい
には排気口２を介する真空排気効率を阻害することにも
なり、多様な損失をもたらすことになる。When the metal 13 deposited in the degassing tank 10 falls by its own weight in this way, the molten steel 9 being degassed is contaminated by the metal 13 having a different composition, and the molten steel composition is disturbed. Occasionally, troubles such as cutting the heating electrode rod 3 by the falling metal 13 may occur.
Further, when the adhered metal 13 is generated and becomes large, it finally obstructs the vacuum exhaust efficiency through the exhaust port 2, resulting in various losses.
【０００６】環流式脱ガス装置においては前述のように
溶鋼９が積極的に循環されるが、上昇管７ａが１本だけ
であるが、上昇管７ａから脱ガス槽10内に導かれた後、
下降管８ａを介して取鍋11へ環流する際に、脱ガス槽10
内の溶鋼流は水平方向についてはほとんどが直線的な流
動となるため脱ガス槽内での溶鋼攪拌力が弱く、脱ガス
効率が乏しいという問題点があった。In the reflux type degassing apparatus, the molten steel 9 is actively circulated as described above, but only one ascending pipe 7a is provided, but after being introduced from the ascending pipe 7a into the degassing tank 10. ,
When circulating to the ladle 11 via the downcomer 8a, the degassing tank 10
Since the molten steel flow inside is almost linear in the horizontal direction, there is a problem that the molten steel stirring force in the degassing tank is weak and the degassing efficiency is poor.
【０００７】環流時の溶鋼攪拌効果をあげる手段として
特開昭54-81111号公報には脱ガス槽の底部に設けられる
溶鋼の下降管を脱ガス槽の中心側に向って傾斜させるも
のが開示されている。この手段は、下降管から取鍋に環
流する溶鋼流の作用により取鍋内における溶鋼の攪拌効
果をあげるものであり、脱ガス槽内のスプラッシュ発生
を抑制したり、槽内溶鋼の攪拌を促進することを目的と
したものではない。As a means for enhancing the stirring effect of molten steel at the time of recirculation, Japanese Patent Laid-Open Publication No. 54-81111 discloses that the downcomer pipe of molten steel provided at the bottom of the degassing tank is inclined toward the center side of the degassing tank. Has been done. This means enhances the stirring effect of molten steel in the ladle by the action of the molten steel flow circulating from the downcomer pipe to the ladle, suppressing the generation of splash in the degassing tank and promoting the stirring of molten steel in the tank. It is not intended to do.
【０００８】また特開昭58-81935号公報には、真空脱ガ
ス槽内部の溶鋼深さを上昇管側で浅く、下降管側で深く
なるように脱ガス槽を傾けて設置するものが開示されて
いる。この手段は上昇管側の溶鋼深さを浅くして溶鋼の
スプラッシュ現象を十分起させることにより脱ガスを促
進すると共に、下降管側の溶鋼深さを深くして溶鋼流の
槽内滞溜時間を増大し、溶鋼流の短絡現象を少くして脱
ガス能力を高めんとするものである。この手段によれば
脱ガス効率は向上するが上昇管側の溶鋼深さが通常より
も浅いのでスプラッシュが激しくなるので槽内の地金付
着を助長するという根本的な欠点がある。Further, Japanese Patent Laid-Open No. 58-81935 discloses that the degassing tank is installed so that the depth of molten steel inside the vacuum degassing tank is shallow on the ascending pipe side and deep on the descending pipe side. Has been done. This means promotes degassing by making the molten steel depth on the riser side shallow enough to cause the splash phenomenon of molten steel, and at the same time deepens the molten steel depth on the downcomer side to hold the molten steel flow in the tank for a while. To increase the degassing ability by reducing the short circuit phenomenon of the molten steel flow. According to this means, the degassing efficiency is improved, but since the molten steel depth on the riser side is shallower than usual, the splash becomes violent, which has the fundamental drawback of promoting the adhesion of metal in the tank.
【０００９】[0009]
【発明が解決しようとする課題】本発明は前記従来技術
の問題点、すなわち槽内スプラッシュの飛散方向が鉛直
に近いため脱ガス槽の上部まで達し、これが上蓋地金と
して成長するという問題点および、脱ガス槽内での攪拌
能力が乏しくこのため脱ガス能力が低いという問題点を
解消することができる環流式真空脱ガス装置を提供する
ことを目的とするものである。DISCLOSURE OF THE INVENTION The present invention has the above-mentioned problems of the prior art, that is, since the splash direction in the tank is almost vertical, it reaches the upper part of the degassing tank and grows as a top metal. SUMMARY OF THE INVENTION It is an object of the present invention to provide a reflux type vacuum degassing apparatus which can solve the problem that the degassing capacity in the degassing tank is poor and therefore the degassing capacity is low.
【００１０】[0010]
【課題を解決するための手段】前記目的を達成するため
の本発明は、真空排気系に接続された真空脱ガス槽の底
部に溶鋼の上昇管および下降管を設け、この上昇管内に
導入される作動ガスの作用により上昇管を通じて取鍋内
の溶鋼を連続的に脱ガス槽内に上昇する一方、前記脱ガ
ス槽内の溶鋼を下降管を通じて取鍋内に排出させるよう
にした環流式真空脱ガス装置において、前記脱ガス槽の
底部に設ける溶鋼の上昇管を少くとも２本とし、これら
上昇管を脱ガス槽の側壁内周に沿う同心円上に同方向に
傾斜角度をもって配設する一方、前記脱ガス槽の底部中
央に溶鋼の下降管を１本設け、前記傾斜角度をもった上
昇管から脱ガス槽内に導かれる溶鋼に回転流を発生させ
るように構成してなることを特徴とする環流式真空脱ガ
ス装置である。According to the present invention for achieving the above object, an ascending pipe and a descending pipe of molten steel are provided at the bottom of a vacuum degassing tank connected to an evacuation system, and introduced into the ascending pipe. A circulating vacuum system in which the molten steel in the ladle is continuously raised into the degassing tank through the riser pipe by the action of the working gas while the molten steel in the degassing tank is discharged into the ladle through the downcomer pipe. In the degassing apparatus, at least two molten steel rising pipes are provided at the bottom of the degassing tank, and these rising pipes are arranged on a concentric circle along the inner circumference of the side wall of the degassing tank with an inclination angle in the same direction. A down pipe for molten steel is provided at the center of the bottom of the degassing tank, and a rotating flow is generated in the molten steel introduced into the degassing tank from the ascending pipe having the inclination angle. It is a reflux type vacuum degassing device.
【００１１】[0011]
【作 用】本発明によれば上昇管に傾斜角度をつけるこ
とによって斜め方向に溶鋼を飛ばし、槽内で溶鋼を回転
させ、鉛直方向の飛散力を弱め、これによって槽上部へ
飛散する到達するスプラッシュを減らし、槽上部での地
金付着を防止する。また溶鋼が回転するために脱ガス槽
の壁面では鋼溶面が上昇し、中部槽の地金を洗い落とし
てくれる。さらに、溶鋼の回転運動により溶鋼の攪拌が
著しく向上し脱ガス効果が向上する。[Operation] According to the present invention, the rising pipe is provided with an inclination angle to blow the molten steel in an oblique direction, and the molten steel is rotated in the tank to weaken the vertical blasting force, thereby reaching the upper portion of the tank. Reduces splash and prevents metal adhesion on the top of the tank. Also, as the molten steel rotates, the molten steel surface rises on the wall surface of the degassing tank, washing away the metal in the middle tank. Furthermore, the rotational movement of the molten steel significantly improves the stirring of the molten steel and improves the degassing effect.
【００１２】[0012]
【実施例】以下、本発明の実施例を図面に基いて説明す
る。図１は本発明の実施例に係る装置を分り易くするた
めに簡略化して示しており、図１（ａ）は正面図であ
り、図１（ｂ）は図１（ａ）のＡ−Ａ矢視を示す平面図
である。図１（ａ）、（ｂ）において、10は脱ガス槽を
示す、脱ガス槽10の下部すなわち下部槽６の底部には溶
鋼９の上昇管７が脱ガス槽10の側壁内周に沿う同心円14
上において同方向に傾斜角度をもって対称位置に２本配
設されている。また脱ガス槽10の下部すなわち下部槽６
の底部中央に溶鋼９の下降管８が鉛直に１本配設されて
いる。Embodiments of the present invention will be described below with reference to the drawings. 1 is a simplified view of an apparatus according to an embodiment of the present invention for easy understanding, FIG. 1 (a) is a front view, and FIG. 1 (b) is AA of FIG. 1 (a). It is a top view which shows an arrow. In FIGS. 1 (a) and 1 (b), 10 denotes a degassing tank. At the bottom of the degassing tank 10, that is, at the bottom of the lower tank 6, an ascending pipe 7 for molten steel 9 runs along the inner circumference of the side wall of the degassing tank 10. Concentric circles 14
Two of them are arranged symmetrically in the same direction with an inclination angle in the same direction. The lower part of the degassing tank 10, that is, the lower tank 6
A downcomer pipe 8 of molten steel 9 is vertically arranged at the center of the bottom of the.
【００１３】取鍋11内の溶鋼９の真空脱ガス処理に際し
ては、まず同心円上に傾斜角度をもって配設された２本
の上昇管７および中央の鉛直な１本の下降管８が取鍋11
内の溶鋼９に浸漬される。引続き真空脱ガス槽10内を排
気して溶鋼を脱ガス槽10内に上昇させるのは従来と同様
である。次に２本の上昇管７内に各々のガス吹込管12を
通してアルゴンガスを導入するとエアリフトの原理によ
り溶鋼９の上昇が起り脱ガス槽10内に溶鋼が流入する。
２本の上昇管７は脱ガス槽10の側壁内周に沿う同心円14
上に同方向に傾斜角度をもつ配設されており、図１
（ａ）に示すように各上昇管７を通して斜め上方に上昇
する溶鋼９は、図１（ｂ）に示すように平面的にみれ
ば、各上昇管７は同心円14の接線方向に指向しているの
で２本の上昇管７から脱ガス槽10内に導入された溶鋼は
水平方向に回転することになる。In vacuum degassing the molten steel 9 in the ladle 11, first, the two ascending pipes 7 arranged on a concentric circle with an inclination angle and one vertically downward descending pipe 8 are placed in the ladle 11.
It is immersed in the molten steel 9 inside. Subsequently, the vacuum degassing tank 10 is evacuated to raise the molten steel into the degassing tank 10 as in the conventional case. Next, when argon gas is introduced into the two ascending pipes 7 through the respective gas blowing pipes 12, the molten steel 9 rises due to the principle of air lift, and the molten steel flows into the degassing tank 10.
The two rising pipes 7 are concentric circles 14 along the inner circumference of the side wall of the degassing tank 10.
As shown in FIG.
As shown in FIG. 1 (b), the molten steel 9 rising obliquely upward through each rising pipe 7 as shown in FIG. 1 (a) is oriented in the tangential direction of the concentric circles 14 when viewed in plan. Therefore, the molten steel introduced from the two rising pipes 7 into the degassing tank 10 rotates in the horizontal direction.
【００１４】このように２本の上昇管７から溶鋼９が斜
傾流となって上昇するので脱ガス槽10内で斜め方向に溶
鋼９が飛散し、鉛直方向への飛散が弱くなる。その結
果、溶鋼のスプラッシュによる脱ガス槽10の上部におけ
る地金付着が軽減される。また前述のように平面的にみ
ると脱ガス槽10内の溶鋼９が回転するため、脱ガス槽10
内の溶鋼９は図１（ａ）に示すように中央部が凹み周辺
部が盛り上った状態とまり、下部槽６の壁面に付着した
地金を洗い落とす作用も得られる。In this way, the molten steel 9 rises as an oblique flow from the two rising pipes 7, so that the molten steel 9 is scattered in the degassing tank 10 in an oblique direction, and the scattering in the vertical direction is weakened. As a result, the metal adhesion on the upper portion of the degassing tank 10 due to the splash of molten steel is reduced. Further, as described above, when viewed in plan, the molten steel 9 in the degassing tank 10 rotates.
As shown in FIG. 1 (a), the molten steel 9 in the inside remains in a state where the central portion is recessed and the peripheral portion is raised, and the action of washing off the metal adhered to the wall surface of the lower tank 6 is also obtained.
【００１５】さらには脱ガス槽10内で溶鋼９の回転によ
る攪拌強化により、上昇管７から下降管８への短絡流が
少くなり、脱ガス槽10内での平均的な滞溜時間が長くな
り、脱ガス効果が著しく向上する。下降管８は脱ガス槽
10の底部中央に設けてあるので、脱ガス槽10内の溶鋼回
転流を妨げることなくスムースに下降管８を下降して取
鍋11に環流される。Further, by strengthening the stirring by rotating the molten steel 9 in the degassing tank 10, the short circuit flow from the ascending pipe 7 to the descending pipe 8 is reduced, and the average staying time in the degassing tank 10 is long. And the degassing effect is significantly improved. Downcomer 8 is a degassing tank
Since it is provided at the center of the bottom of 10, the descending pipe 8 is smoothly lowered and is recirculated to the ladle 11 without disturbing the molten steel rotating flow in the degassing tank 10.
【００１６】なお、前記実施例では上昇管を２本配設す
る場合について説明したが本発明ではこれに限定するも
のではなく、３本、４本あるいはそれ以上とすることも
可能である。In the above embodiment, the case where two ascending pipes are provided has been described, but the present invention is not limited to this, and it is also possible to have three, four or more.
【００１７】[0017]
【発明の効果】以上説明したように本発明によれば傾斜
させた上昇管から斜めに溶鋼を上昇させるので脱ガス槽
内でのスプラッシュの鉛直方法へ飛散が弱くなり、槽内
上部の地金付着を軽減できる。また脱ガス槽内の溶鋼が
回転するので遠心力により槽壁面部の溶鋼盛り上りによ
り地金が洗い落とすことができるので脱ガス槽の連続使
用期間延長が達成される。As described above, according to the present invention, the molten steel is raised diagonally from the inclined rising pipe, so that the splashing is weakened in the vertical method of splash in the degassing tank, and the metal in the upper part of the tank is weakened. Adhesion can be reduced. Further, since the molten steel in the degassing tank is rotated, the metal can be washed off due to the rising of the molten steel on the wall surface of the tank by centrifugal force, so that the continuous use period of the degassing tank can be extended.
【００１８】さらに脱ガス槽内の溶鋼回転流による攪拌
強化により溶鋼の脱ガス効果を向上でき、生産性向上が
達成される。Further, the degassing effect of the molten steel can be improved by enhancing the stirring by the molten steel rotating flow in the degassing tank, and the productivity can be improved.
【図１】本発明の実施例に係る装置を示し、（ａ）は正
面図、（ｂ）は（ａ）のＡ−Ａ矢視を示す平面図であ
る。1A and 1B show an apparatus according to an embodiment of the present invention, FIG. 1A is a front view, and FIG. 1B is a plan view taken along the line AA of FIG.
【図２】従来例に係る装置を示す縦断面図である。FIG. 2 is a vertical cross-sectional view showing a device according to a conventional example.
【図３】図２の装置において、地金が付着した状況を示
す縦断面図である。FIG. 3 is a vertical cross-sectional view showing a state in which a metal is attached in the apparatus of FIG.
１ 上蓋 ２ 排気口 ３ 加熱電極棒 ４ 上部槽 ５ 中部槽 ６ 下部槽 ７ 上昇管 ８ 下降管 ９ 溶鋼 10 真空脱ガス槽 11 取鍋 12 ガス吹込管 13 地金 14 同心円 1 Upper lid 2 Exhaust port 3 Heating electrode rod 4 Upper tank 5 Middle tank 6 Lower tank 7 Ascending pipe 8 Downcomer pipe 9 Molten steel 10 Vacuum degassing tank 11 Ladle 12 Gas injection pipe 13 Metal 14 Concentric circle
Claims (1)
底部に溶鋼の上昇管および下降管を設け、この上昇管内
に導入される作動ガスの作用により上昇管を通じて取鍋
内の溶鋼を連続的に脱ガス槽内に上昇する一方、前記脱
ガス槽内の溶鋼を下降管を通じて取鍋内に排出させるよ
うにした環流式真空脱ガス装置において、前記脱ガス槽
の底部に設ける溶鋼の上昇管を少くとも２本とし、これ
ら上昇管を脱ガス槽の側壁内周に沿う同心円上に同方向
に傾斜角度をもって配設する一方、前記脱ガス槽の底部
中央に溶鋼の下降管を鉛直に１本設け、前記傾斜角度を
もった上昇管から脱ガス槽内に導かれる溶鋼に回転流を
発生させるように構成してなることを特徴とする環流式
真空脱ガス装置。1. A rising pipe and a descending pipe for molten steel are provided at the bottom of a vacuum degassing tank connected to a vacuum exhaust system, and the working gas introduced into the rising pipe causes the molten steel in the ladle to pass through the rising pipe. While continuously rising in the degassing tank, in the reflux type vacuum degassing device configured to discharge the molten steel in the degassing tank into the ladle through the downcomer pipe, the molten steel provided at the bottom of the degassing tank There are at least two riser pipes, and these riser pipes are arranged in concentric circles along the inner circumference of the side wall of the degassing tank in the same direction with an inclination angle, while a descending pipe of molten steel is provided vertically at the center of the bottom of the degassing tank. A recirculation-type vacuum degassing apparatus, characterized in that a rotary flow is generated in the molten steel introduced into the degassing tank from the rising pipe having the inclination angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32043291A JPH05156342A (en) | 1991-12-04 | 1991-12-04 | Circulating type vacuum degassing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32043291A JPH05156342A (en) | 1991-12-04 | 1991-12-04 | Circulating type vacuum degassing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05156342A true JPH05156342A (en) | 1993-06-22 |
Family
ID=18121385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32043291A Pending JPH05156342A (en) | 1991-12-04 | 1991-12-04 | Circulating type vacuum degassing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05156342A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101701982B1 (en) * | 2015-10-30 | 2017-02-02 | 주식회사 포스코 | Refining facilities and method |
-
1991
- 1991-12-04 JP JP32043291A patent/JPH05156342A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101701982B1 (en) * | 2015-10-30 | 2017-02-02 | 주식회사 포스코 | Refining facilities and method |
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