JP3038783B2 - Refining equipment for chromium-containing molten steel - Google Patents
Refining equipment for chromium-containing molten steelInfo
- Publication number
- JP3038783B2 JP3038783B2 JP2108900A JP10890090A JP3038783B2 JP 3038783 B2 JP3038783 B2 JP 3038783B2 JP 2108900 A JP2108900 A JP 2108900A JP 10890090 A JP10890090 A JP 10890090A JP 3038783 B2 JP3038783 B2 JP 3038783B2
- Authority
- JP
- Japan
- Prior art keywords
- flange
- molten steel
- hood
- chromium
- refining
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、減圧下にアルゴン（又は窒素）吹き込みに
より含クロム溶鋼を脱炭精錬する為の精錬装置に関す
る。Description: TECHNICAL FIELD The present invention relates to a refining apparatus for decarburizing and refining chromium-containing molten steel by blowing argon (or nitrogen) under reduced pressure.
〔従来の技術〕 従来、高クロム溶鋼を精錬する技術としては、減圧下
で酸素を吹き込む真空脱炭法、及びアルゴン−酸素混合
ガスを吹き込むAODプロセスが一般に知られているが、
最近、減圧下にアルゴン−酸素混合ガスを吹き込む脱炭
精錬法が提案されている。また、精錬過程のうち大気圧
下での処理をAOD装置で行い、次いで真空精錬装置にお
いて、20Torrという高度の減圧下の精錬を行う方法も提
案されている（例えば、特開昭61−136611号公報参
照）。(Prior art) Conventionally, as a technique for refining high chromium molten steel, a vacuum decarburization method of blowing oxygen under reduced pressure and an AOD process of blowing an argon-oxygen mixed gas are generally known.
Recently, a decarburization refining method in which an argon-oxygen mixed gas is blown under reduced pressure has been proposed. In addition, there has been proposed a method in which a process under atmospheric pressure in a refining process is performed by an AOD device, and then, in a vacuum refining device, refining is performed under a high reduced pressure of 20 Torr (for example, Japanese Patent Application Laid-Open No. 61-136611). Gazette).
本発明者等は、最近、高クロム溶鋼の改良された精錬
法として、溶鋼中のＣ含有量が約0.2％に至るまでは、
アルゴン−酸素混合ガスを吹き込み、それ以後は、雰囲
気をほぼ200Torr以下に減圧して、アルゴン等の非酸化
性ガスだけを吹き込む技術を開発し、更にその為の精錬
装置について、炉体上部にフードを着脱可能に載置した
ものを提案した。Recently, the present inventors have proposed an improved refining method for high chromium molten steel until the C content in molten steel reaches about 0.2%.
A technique for injecting an argon-oxygen mixed gas, reducing the atmosphere to approximately 200 Torr or less, and then injecting only a non-oxidizing gas such as argon, has been developed. Is proposed to be detachably mounted.
ところで、本発明者らが開発した方法において、上記
のように減圧下と常圧の両方の条件で操作を行う場合、
フードを炉体上部のフランジに載置したり、取り外した
りすることが必要であり、そしてその場合、精錬操作中
における気密が十分に保たれるようにするためには、フ
ードを載置する際に、フランジ表面が清浄に保たれ、溶
鋼のスプラッシュが付着していない状態になっているこ
とが必要になる。ところが、真空下に非酸化性ガスを吹
き込む段階以前の高炭素領域で脱炭を行っている段階、
即ち、炉体上部にフードを載置する以前の段階でも溶鋼
スプラッシュが発生し、炉体上部のフランジ上に付着す
ることがしばしば生じる。多量の或いは大きなスプラッ
シュの付着は、フードを載置したときの気密シールを不
十分なものにする危険がある。By the way, in the method developed by the present inventors, when operating under both reduced pressure and normal pressure conditions as described above,
It is necessary to place and remove the hood on the flange at the top of the furnace body, and if so, to ensure that the hood is airtight during the refining operation, In addition, it is necessary that the surface of the flange is kept clean and splash of molten steel is not attached. However, the stage of decarburization in the high carbon region before the stage of blowing the non-oxidizing gas under vacuum,
That is, even before the hood is placed on the upper part of the furnace body, the molten steel splash often occurs and adheres to the flange on the upper part of the furnace body. Large or large splashes can risk an inadequate hermetic seal when the hood is placed.
しかしながら、従来の精錬技術においては、上記のよ
うな要求を満たすために、格別の配慮はなされていず、
それに関する技術は知られていなかった。However, in the conventional refining technology, no special consideration has been made to satisfy the above requirements,
The technology involved was not known.
本発明は、上記のような実状に鑑みてなされたもので
ある。The present invention has been made in view of the above situation.
即ち、本発明の目的は、フードを載置する際に、フラ
ンジ表面を、清浄に保つことができる含クロム溶鋼精錬
装置を提供することにある。That is, an object of the present invention is to provide a chromium-containing molten steel refining apparatus that can keep the surface of a flange clean when a hood is placed.
本発明を実施例に相当する第１図によって説明する
と、本発明の含クロム溶鋼用の精錬装置は、下部にガス
吹き込み用羽口を備え、上部にフードを載置するための
フランジ４を設けた傾動可能な炉体１と、真空装置に接
続するダクトを備え、炉体上部に着脱可能なフード３と
を組み合わせてなり、そして、上記フランジの内部に炉
壁を一周するように冷却水用流路５を設け、また、フラ
ンジの上方の炉壁外周に沿って、圧縮空気を噴射するノ
ズルを多数備えた圧縮空気用流路６を設けたことを特徴
とする。The present invention will be described with reference to FIG. 1 corresponding to an embodiment. The smelting apparatus for chromium-containing molten steel of the present invention is provided with a tuyere for gas injection at a lower part and a flange 4 for mounting a hood at an upper part. The furnace body 1 is provided with a tiltable furnace body 1 and a duct connected to a vacuum device, and a detachable hood 3 is provided on the upper part of the furnace body. A flow path 5 is provided, and a compressed air flow path 6 provided with a number of nozzles for injecting compressed air is provided along the outer periphery of the furnace wall above the flange.
本発明の精錬装置においては、炉体上部に取り付けら
れたフランジに、冷却水を通す流路が設けられているか
ら、フランジ表面は常に冷却された状態にあり、フラン
ジ表面に飛散してきたスプラッシュは、急速に冷却され
る為、フランジに溶着することがない。そして、フラン
ジ上方の炉壁周囲に設けられた圧縮空気流路のノズルか
ら、圧縮空気がフランジに向けて噴射されるので、フラ
ンジ上に存在するスプラッシュは、噴射された圧縮空気
によって吹き飛ばされ、フランジ表面が清浄に保たれ
る。In the smelting apparatus of the present invention, the flange attached to the upper part of the furnace body is provided with a flow path for passing cooling water, so the flange surface is always in a cooled state, and the splash scattered on the flange surface is Because it is cooled rapidly, it does not weld to the flange. And, since compressed air is injected toward the flange from the nozzle of the compressed air flow path provided around the furnace wall above the flange, the splash existing on the flange is blown off by the injected compressed air, The surface is kept clean.
次に、本発明の実施例を、図面によって説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
第１図は、本発明の精錬装置の概略の断面図であり、
第２図は、そのフランジの部分の拡大断面図である。FIG. 1 is a schematic sectional view of a refining device of the present invention,
FIG. 2 is an enlarged sectional view of a portion of the flange.
図中、１は、傾動可能な炉体であり、下部にガス吹き
込み用羽口２を備えている。炉体の上部には、フード３
を載置するためのフランジ４が設けられている。フラン
ジ４は、その内部に、炉壁を一周するように冷却水用流
路５が設けられ、図示されない供給管によって供給され
た冷却水が流れるようになっている。フランジ４の上部
には、炉壁外周に沿って、圧縮空気用流路６が設けられ
ており、その圧縮空気用流路の側壁７には、ノズル８が
多数、例えば、150個設けられている。このノズル８は
斜め下方に向けて開口している。圧縮空気用流路６に
は、送気管９より圧縮空気が導入される。In the drawing, reference numeral 1 denotes a tiltable furnace body, which is provided with a gas blowing tuyere 2 at a lower portion. At the top of the furnace, a hood 3
Is provided. The cooling water flow path 5 is provided inside the flange 4 so as to go around the furnace wall, so that cooling water supplied by a supply pipe (not shown) flows. A flow path 6 for compressed air is provided on the upper part of the flange 4 along the outer periphery of the furnace wall, and a large number, for example, 150 nozzles 8 are provided on a side wall 7 of the flow path for compressed air. I have. The nozzle 8 opens obliquely downward. Compressed air is introduced into the compressed air channel 6 from an air supply pipe 9.
フード３は、上記フランジの上に着脱自在に載置され
るものであって、その側面に真空装置に接続するダクト
10が取り付けられており、また、フード３の下端部は、
リング状ガスケット11を取り付けたフランジ12になって
いる。The hood 3 is detachably mounted on the flange and has a duct connected to a vacuum device on a side surface thereof.
10 is attached, and the lower end of the hood 3 is
It is a flange 12 to which a ring-shaped gasket 11 is attached.
上記の構成を有する精錬装置によって精錬を行なう場
合、フードがフランジ上から取り外されている状態で
は、炉体内部の溶鋼13からのスプラッシュは、フランジ
表面に飛散するが、フランジは冷却水によって冷却され
ているので、フランジ表面に飛散したスプラッシュは急
速に冷却され、フランジに溶着するのが防止される。フ
ード３をフランジ上に載置する際には、フランジ上のス
プラッシュを除去する必要があるので、圧縮空気を送気
管９から圧縮空気流路６に導入し、ノズル８からフラン
ジに向けて噴射させる。それによって、フランジ表面に
存在しているスプラッシュは吹き飛ばされ、フランジ表
面は清浄に保たれる。When refining is performed by the refining device having the above configuration, in a state where the hood is removed from above the flange, splash from the molten steel 13 inside the furnace body scatters on the flange surface, but the flange is cooled by cooling water. As a result, the splash scattered on the flange surface is rapidly cooled, and is prevented from welding to the flange. When placing the hood 3 on the flange, it is necessary to remove the splash on the flange, so compressed air is introduced into the compressed air flow path 6 from the air supply pipe 9 and injected from the nozzle 8 toward the flange. . Thereby, the splash existing on the flange surface is blown off, and the flange surface is kept clean.
本発明の精錬装置においては、フード３をフランジ４
上に載置した場合、フランジの内部には、冷却水が流れ
ているので、リング状ガスケット11が損傷を受けること
も防止でき、気密が十分に保持できるという利点もあ
る。In the refining apparatus of the present invention, the hood 3 is
When placed on the top, since the cooling water flows inside the flange, the ring-shaped gasket 11 can be prevented from being damaged, and there is an advantage that the airtightness can be sufficiently maintained.
本発明の精錬装置は、上記の構成を有するから、フー
ドを載置する際に、フランジ表面を常に清浄に保持する
ことが可能になる。したがって、フードを載置した後
は、十分な気密シールが保たれるという効果を生じる。Since the refining device of the present invention has the above configuration, it is possible to always keep the flange surface clean when placing the hood. Therefore, there is an effect that a sufficient airtight seal is maintained after the hood is placed.
第１図は、本発明の精錬装置の概略の断面図であり、第
２図は、そのフランジ部の拡大断面図である。 １……炉体、２……ガス吹き込み用羽口、３……フー
ド、４……フランジ、５……冷却水用流路、６……圧縮
空気用流路、７……側壁、８……ノズル、９……送気
管、10……ダクト、11……リング状ガスケット、12……
フランジ、13……溶鋼。FIG. 1 is a schematic sectional view of a refining apparatus of the present invention, and FIG. 2 is an enlarged sectional view of a flange portion thereof. DESCRIPTION OF SYMBOLS 1 ... Furnace body, 2 ... Tuyere for gas injection, 3 ... Hood, 4 ... Flange, 5 ... Flow path for cooling water, 6 ... Flow path for compressed air, 7 ... Side wall, 8 ... … Nozzle, 9… Air supply pipe, 10… Duct, 11… Ring gasket, 12 ……
Flange, 13 ... molten steel.
Claims (1)
フードを載置するためのフランジを設けた傾動可能な炉
体と、真空装置に接続するダクトを備え、炉体上部に着
脱可能なフードとを組み合わせてなり、該フランジの内
部に炉壁を一周するように冷却水用流路を設け、フラン
ジの上方の炉壁外周に沿って、圧縮空気を噴射するノズ
ルを多数備えた圧縮空気用流路を設けたことを特徴とす
る含クロム溶鋼用精錬装置。1. A tiltable furnace body provided with a gas injection tuyere at a lower part and a flange for mounting a hood at an upper part, and a duct connected to a vacuum device, and detachable at an upper part of the furnace body. A cooling water flow path is provided around the furnace wall inside the flange, and a number of nozzles for injecting compressed air along the outer periphery of the furnace wall above the flange are provided. A smelting apparatus for chromium-containing molten steel, comprising a flow path for air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2108900A JP3038783B2 (en) | 1990-04-26 | 1990-04-26 | Refining equipment for chromium-containing molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2108900A JP3038783B2 (en) | 1990-04-26 | 1990-04-26 | Refining equipment for chromium-containing molten steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH049422A JPH049422A (en) | 1992-01-14 |
| JP3038783B2 true JP3038783B2 (en) | 2000-05-08 |
Family
ID=14496474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2108900A Expired - Lifetime JP3038783B2 (en) | 1990-04-26 | 1990-04-26 | Refining equipment for chromium-containing molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3038783B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101705141B1 (en) | 2015-06-29 | 2017-02-10 | 서울메트로 | Improved technique of railway track ballast operation |
| KR101705142B1 (en) | 2015-06-29 | 2017-02-10 | 서울메트로 | Roadbed construction equipment improved operation of the railway track |
-
1990
- 1990-04-26 JP JP2108900A patent/JP3038783B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101705141B1 (en) | 2015-06-29 | 2017-02-10 | 서울메트로 | Improved technique of railway track ballast operation |
| KR101705142B1 (en) | 2015-06-29 | 2017-02-10 | 서울메트로 | Roadbed construction equipment improved operation of the railway track |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH049422A (en) | 1992-01-14 |
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