JP3851006B2 - Lined structure of vacuum degassing equipment vacuum chamber - Google Patents
Lined structure of vacuum degassing equipment vacuum chamber Download PDFInfo
- Publication number
- JP3851006B2 JP3851006B2 JP33816398A JP33816398A JP3851006B2 JP 3851006 B2 JP3851006 B2 JP 3851006B2 JP 33816398 A JP33816398 A JP 33816398A JP 33816398 A JP33816398 A JP 33816398A JP 3851006 B2 JP3851006 B2 JP 3851006B2
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- JP
- Japan
- Prior art keywords
- lining
- brick
- reflux
- vacuum
- vacuum chamber
- 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)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Description
【0001】
【発明の属する技術分野】
本発明は、真空脱ガス装置真空槽における敷部の内張り構造に関する。
【0002】
【従来の技術】
溶鋼の脱ガス処理および成分調整を行う真空脱ガス装置において、RH式あるいはKTB式と称される装置は、2本の環流管を備えている。その稼動に際しては、一方の環流管から真空槽に導入した溶鋼をもう一方の環流管から排出し、この溶鋼環流の操作で前記の溶鋼処理を行う。
【0003】
真空脱ガス装置の真空槽における敷部(底部)の耐火物内張りは、装置稼動に伴う熱膨張収縮の繰り返しで構造の緩みあるいは亀裂が生じると、溶鋼による浮力で浮き上がり損傷を招く問題がある。
【0004】
真空槽の敷部は環流孔の存在で内張り構造が複雑であり、その分、構造の緩みが生じやす。また、周囲を外殻鉄板で拘束されており、内張りは熱膨張の逃げ代がないため座屈亀裂が生じやすい。
【0005】
そこで、内張りの浮き上がり防止対策として従来から種々の提案がなされている。例えば特開平5-25534号公報では、環流管れんがの上部側面にテーパーを設けている。実開昭64-30350号公報では、敷部れんがを陸迫り構造の積み付けまたはダボ付きとしている。
【0006】
【発明が解決しようとする課題】
しかし、上記従来の構造では浮き上がり防止としていずれも十分なものではない。環流管れんがの上部側面にテーパーを設けたものは、環流管れんがを押さえる周囲のれんがの浮き上がり防止が不十分である。敷部れんがを陸迫り構造としたものは、環流管れんがの浮き上がり防止には効果がない。また、ダボ付きれんがの使用は、ダボ部分への熱膨張収縮応力の集中で亀裂が生じ易いことに加え、ダボ形成による手間でれんがのコスト高を招く。
【0007】
【課題を解決するための手段】
本発明は、真空脱ガス装置真空槽の内張り構造における上記の問題を解決したものであり、その特徴とするところは、環流孔を2箇所備えた真空槽敷部の内張りにおいて、環流孔同士の間に位置する内張りれんが列を敷部の中央線にそって一方向に傾斜して積み付けると共に、環流管れんがの上方外周面に環流孔の上方に向かって先絞りのテーパーを設け、かつ前記環流孔同士の間に位置するれんがの側面を前記環流管れんがの上方外周面のテーパーに見合う角度をもって上広がりとしたことにある。
【0008】
【発明の実施の形態】
以下、図面にもとづいて本発明をさらに詳細に説明する。図1は真空脱ガス装置の真空槽(1)のうち、敷部(2)を中心とした本発明要部の縦断面図である。図2はその平面図、図3は図1のA-A線断面の右半分である。
【0009】
環流孔(3)を形成する環流管れんが(4)は、ここでは上下および周方向に複数分割にしたものを示すが、その分割個数に制限はなく、また分割しない一体構造であってもよい。
【0010】
環流管れんが(4)の上方外周面(5)には、環流孔の上方に向かって先絞りのテーパーを設ける。環流管れんが(4)はこのテーパーにより、周囲の内張りれんがによる押さえを受け、浮き上がりが防止される。このテーパーの最適角度は、水平面に対して75〜80°である。
【0011】
環流管れんが(4)のうち、図のように真空槽(1)の側壁に面する側は必ずしもテーパーを設ける必要がない。これは、側壁に面する側は側壁の内張り(6)でよる押圧することで、浮き上がりを防止することができるためである。
【0012】
敷部(2)には環流孔(3)が2箇所備えられているが、この環流孔同士の間に位置する内張りは一般に中之島と称され、敷部(2)の中央に位置することから、環流管れんがと並んで浮き上がりが最も生じ易い部位である。本発明は、この環流孔(3)同士の間に位置するこの内張りれんが(7)を図3に見られるように、敷部の中央線Bにそって一方向に傾斜して積付ける構築する。図3のとおり、ここでは左方向への傾斜であるが、右方向への傾斜でもよい。
【0013】
この傾斜によって、傾斜方向側のれんがをその後方のれんがが順次押さえ、内張りれんが(7)列の全体の浮き上がりが防止される。なお、ここでの傾斜角度は、水平面に対して75〜80°が最も好ましい。
【0014】
この内張りれんが(7)は、傾斜による積付けで前記した自身の浮き上がり防止に加え、上広がりの構造によって環流管れんが(4)を押圧する効果を併せ持つ。図4は、その内張りれんが(7)の斜視図である。
【0015】
図2および図3のとおり、傾斜して積み付けるれんが(7)列の全部について上広がり構造にしている。しかし、少なくとも環流管れんが(4)と接するものについては上広がり構造にする必要があるが、他は必ずしも上広がりの構造にしなくてもよい。
【0016】
また、敷部の内張りにおいて、傾斜して積み付けるれんが(7)および環流管れんが(4)以外のれんがは、通常の積み付け構造で足りる。
【0017】
環流孔(3)同士の間に位置するこの内張りれんが(7)は上広がり形状によって浮き上がり易いことから、れんが(7)列の両端は固定する必要がある。その固定する手段としては、例えば図3のようにれんが(7)列の両端を側壁の内張り(6)の下部に位置させ、この側壁の内張り(6)の押圧によって行うことができる。
【0018】
図には示していないが、各れんが同士は必要によってはモルタルを介在させる。また、側壁の内張りは不定形耐火物であってもよい。
【0019】
敷部の内張りは一端に浮き上がり生じると損傷個所から内張り背面に溶鋼流が侵入し、浮き上がり損傷はたちまち敷部全域に波及する。敷部内張りにおいて、環流管れんがと環流孔同士の間に位置するれんがとは、共に浮き上がりの起点となりやすい個所である。従来構造では、これら各個所の浮き上がりを同時に防止する手段がとられておらず、このことが浮き上がり防止に十分な効果を得ていない原因と考えられる。
【0020】
これに対し本発明は、環流管れんがと環流孔同士の間に位置するれんがについて、その浮き上がりを同時に阻止することができる。すなわち、上広がりのれんがをもって環流管れんがを押圧し、この上広がりのれんがについてはその傾斜による積み付けで浮き上がりを防止する。しかも、浮き上がりを防止のために、れんがへのダボ形成なども必要とせず、れんがの亀裂発生およびコスト高の問題もない。
【0021】
また、本発明では、環流孔の間に位置するれんがが上広がりによる逆テーパーによって、このれんがはその左右からの環流管れんがの熱膨張を受けた際に上方に移動することで膨張応力が緩和され、従来構造に見られる耐火物組織の座屈亀裂の発生が防止される。しかも、このれんがは、環流管れんがの熱膨張応力を受けて上方に多少移動しても、傾斜による積付けのために浮き上がることはない。
【0022】
本発明による構造は、以上の作用によって敷部内張りの浮き上がり防止の効果が格段に向上する。
【0023】
【発明の効果】
真空脱ガス装置の敷部内張りにおける浮き上がり損傷は、通常の侵食等の損傷と違って湯漏れ等の大事故にもつながる致命的な欠陥である。本発明はこの問題を解決し、真空脱ガス装置の安定的な操業に寄与するものであり、その価値はきわめて大きい。
【図面の簡単な説明】
【図1】真空脱ガス装置の真空槽のうち、敷部を中心とした本発明要部の縦断面図である。
【図2】図1に対しての平面図である。
【図3】図1のA-A線断面の右半分である。
【図4】環流孔同士の間に位置する内張りれがの斜視図である。
1 真空槽
2 敷部
3 環流孔
4 環流管れんが
5 環流管れんがの上方外周面
6 側壁の内張り
7 環流孔同士の間に位置するこの内張りれんが
B 中心線[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lining structure of a floor portion in a vacuum degassing apparatus vacuum chamber.
[0002]
[Prior art]
In a vacuum degassing apparatus that performs degassing treatment and component adjustment of molten steel, an apparatus called RH type or KTB type includes two reflux tubes. During the operation, the molten steel introduced into the vacuum tank from one reflux pipe is discharged from the other reflux pipe, and the above-described molten steel treatment is performed by the operation of this molten steel reflux.
[0003]
The refractory lining of the laying part (bottom) in the vacuum tank of the vacuum degassing apparatus has a problem that when the structure is loosened or cracked due to repeated thermal expansion and contraction due to the operation of the apparatus, the buoyancy caused by the molten steel lifts up and causes damage.
[0004]
The lining portion of the vacuum chamber has a complicated lining structure due to the presence of the reflux holes, and the structure is easily loosened accordingly. In addition, the periphery is constrained by an outer shell iron plate, and the lining does not have the allowance for thermal expansion, so that a buckling crack is likely to occur.
[0005]
Therefore, various proposals have conventionally been made as measures for preventing the lining from rising. For example, in Japanese Patent Laid-Open No. 5-25534, a taper is provided on the upper side surface of the reflux tube brick. In Japanese Utility Model Publication No. 64-30350, the floor brick is made of land-based structure or with dowels.
[0006]
[Problems to be solved by the invention]
However, none of the conventional structures described above is sufficient to prevent lifting. When the upper side surface of the reflux pipe brick is provided with a taper, the surrounding brick holding the reflux pipe brick is not sufficiently prevented from rising. The laying brick that has a close-to-land structure is not effective in preventing the rise of the reflux pipe brick. In addition, the use of bricks with dowels causes the cracks to easily occur due to the concentration of thermal expansion / shrinkage stress on the dowels, and also increases the cost of bricks due to the labor involved in dowel formation.
[0007]
[Means for Solving the Problems]
The present invention solves the above-mentioned problem in the lining structure of the vacuum degassing apparatus vacuum chamber, and the feature thereof is that in the lining of the vacuum chamber laying portion having two circulation holes, the circulation holes The lining bricks positioned between them are stacked in a direction inclined along the center line of the laying portion, and a tapered taper is provided on the upper outer peripheral surface of the reflux pipe brick toward the upper part of the reflux hole, and That is, the side surface of the brick located between the reflux holes is widened with an angle corresponding to the taper of the upper outer peripheral surface of the reflux tube brick.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a longitudinal cross-sectional view of the main part of the present invention, centering on a floor portion (2), in a vacuum tank (1) of a vacuum degassing apparatus. 2 is a plan view thereof, and FIG. 3 is a right half of a cross section taken along line AA of FIG.
[0009]
The reflux pipe brick (4) forming the reflux hole (3) is shown here divided into a plurality of parts in the vertical and circumferential directions, but the number of divisions is not limited and may be an integral structure that is not divided. .
[0010]
The upper outer peripheral surface (5) of the reflux pipe brick (4) is provided with a tapered end tapered toward the upper part of the reflux hole. Because of this taper, the reflux pipe brick (4) is pressed by the surrounding lining brick and prevented from lifting. The optimum angle of this taper is 75 to 80 ° with respect to the horizontal plane.
[0011]
Of the reflux tube brick (4), the side facing the side wall of the vacuum chamber (1) does not necessarily need to be tapered as shown. This is because the side facing the side wall can be prevented from rising by being pressed by the side wall lining (6).
[0012]
The laying part (2) has two circulation holes (3), but the lining located between these circulatory holes is generally called Nakanoshima and is located in the center of the laying part (2) It is the part where floating is most likely to occur alongside the reflux tube brick. The present invention is constructed in such a manner that the lining brick (7) located between the circulation holes (3) is inclined and stacked in one direction along the center line B of the laying portion as seen in FIG. . As shown in FIG. 3, the inclination is in the left direction here, but may be in the right direction.
[0013]
By this inclination, the bricks on the inclination direction side are sequentially pressed by the bricks behind them, and the lining bricks (7) are prevented from being lifted up as a whole. The inclination angle here is most preferably 75 to 80 ° with respect to the horizontal plane.
[0014]
This lining brick (7) has the effect of pressing the reflux pipe brick (4) by the upward spreading structure in addition to the above-mentioned prevention of floating by stacking by inclination. FIG. 4 is a perspective view of the lining brick (7).
[0015]
As shown in FIG. 2 and FIG. 3, the bricks that are inclined and stacked (7) have an upward spreading structure for all of the rows. However, at least the reflux pipe brick that contacts with (4) needs to have an upwardly spread structure, but the other need not necessarily have an upwardly spread structure.
[0016]
In addition, bricks other than the bricks (7) and recirculating pipe bricks (4) to be stacked at the lining of the laying part need only the normal stacking structure.
[0017]
Since this lining brick (7) located between the reflux holes (3) is easy to float due to the upward spreading shape, it is necessary to fix both ends of the brick (7) row. As the means for fixing, for example, as shown in FIG. 3, both ends of the brick (7) row are positioned below the side wall lining (6) and the side wall lining (6) is pressed.
[0018]
Although not shown in the figure, each brick interposes mortar as necessary. The side wall lining may be an irregular refractory.
[0019]
When the lining of the laying part rises at one end, the molten steel flow penetrates from the damaged part to the back of the lining, and the rising damage immediately spreads throughout the laying part. In the floor lining, the reflux pipe brick and the brick located between the reflux holes are places where they tend to be lifted up. In the conventional structure, there is no means for preventing the lifting of these parts at the same time, which is considered to be a cause of not obtaining a sufficient effect for preventing the lifting.
[0020]
On the other hand, the present invention can simultaneously prevent the floating of bricks located between the reflux pipe brick and the reflux holes. That is, the reflux pipe brick is pressed with the upwardly spread brick, and the upwardly spread brick is prevented from being lifted by stacking by the inclination. Moreover, in order to prevent lifting, dowel formation on the brick is not required, and there is no problem of brick cracking and high cost.
[0021]
In addition, in the present invention, the brick located between the reflux holes is inversely tapered due to the upward spread, and this brick moves upward when the reflux pipe brick from the left and right receives thermal expansion, thereby relaxing the expansion stress. This prevents the occurrence of buckling cracks in the refractory structure found in conventional structures. Moreover, even if the brick is slightly moved upward due to the thermal expansion stress of the reflux pipe brick, it will not be lifted due to the loading due to the inclination.
[0022]
In the structure according to the present invention, the effect of preventing the floor lining from being lifted is remarkably improved by the above operation.
[0023]
【The invention's effect】
Lifting damage in the lining of the vacuum degassing unit is a fatal defect that leads to a major accident such as leakage of water, unlike normal erosion damage. The present invention solves this problem and contributes to the stable operation of the vacuum degassing apparatus, and its value is extremely great.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part of the present invention, centering on a floor portion, in a vacuum chamber of a vacuum degassing apparatus.
FIG. 2 is a plan view with respect to FIG.
FIG. 3 is a right half of the cross section taken along the line AA in FIG. 1;
FIG. 4 is a perspective view of a lining located between the reflux holes.
DESCRIPTION OF SYMBOLS 1
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33816398A JP3851006B2 (en) | 1998-11-27 | 1998-11-27 | Lined structure of vacuum degassing equipment vacuum chamber |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33816398A JP3851006B2 (en) | 1998-11-27 | 1998-11-27 | Lined structure of vacuum degassing equipment vacuum chamber |
Publications (2)
Publication Number | Publication Date |
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JP2000160231A JP2000160231A (en) | 2000-06-13 |
JP3851006B2 true JP3851006B2 (en) | 2006-11-29 |
Family
ID=18315517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP33816398A Expired - Fee Related JP3851006B2 (en) | 1998-11-27 | 1998-11-27 | Lined structure of vacuum degassing equipment vacuum chamber |
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JP (1) | JP3851006B2 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007093101A (en) * | 2005-09-28 | 2007-04-12 | Kurosaki Harima Corp | Laid brick lining structure for molten metal container |
JP2012001742A (en) * | 2010-06-14 | 2012-01-05 | Shinagawa Refractories Co Ltd | Circulation tube refractory product for rh furnace |
JP5246313B2 (en) | 2010-10-13 | 2013-07-24 | Jfeスチール株式会社 | RH degassing lower tank |
JP6226483B2 (en) * | 2015-11-16 | 2017-11-08 | Jfeスチール株式会社 | Circulation tube of vacuum degasser |
CN107723398B (en) * | 2017-11-20 | 2023-05-16 | 中国重型机械研究院股份公司 | Variable diameter type vacuum tank structure for VD/VOD furnace |
CN108842038A (en) * | 2018-07-03 | 2018-11-20 | 洛阳利尔耐火材料有限公司 | The building method of circulating pipe is improved in a kind of RH refining furnace |
CN110885913A (en) * | 2019-10-24 | 2020-03-17 | 包头钢铁(集团)有限责任公司 | Method for controlling length of tubular brick at steel tapping hole and improving steel tapping rate |
-
1998
- 1998-11-27 JP JP33816398A patent/JP3851006B2/en not_active Expired - Fee Related
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JP2000160231A (en) | 2000-06-13 |
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