JPH034434Y2 - - Google Patents
Info
- Publication number
- JPH034434Y2 JPH034434Y2 JP5874783U JP5874783U JPH034434Y2 JP H034434 Y2 JPH034434 Y2 JP H034434Y2 JP 5874783 U JP5874783 U JP 5874783U JP 5874783 U JP5874783 U JP 5874783U JP H034434 Y2 JPH034434 Y2 JP H034434Y2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- refractory
- refractories
- slit
- gas injection
- 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
Links
- 238000002347 injection Methods 0.000 claims description 42
- 239000007924 injection Substances 0.000 claims description 42
- 239000011819 refractory material Substances 0.000 claims description 33
- 230000013011 mating Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 96
- 239000002184 metal Substances 0.000 description 29
- 238000007664 blowing Methods 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 229910001873 dinitrogen Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000009760 electrical discharge machining Methods 0.000 description 1
- 239000011451 fired brick Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000011452 unfired brick Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は転炉、取鍋等の冶金容器の底部よりガ
スを吹込む為のガス吹込用耐火物に関するもので
ある。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gas injection refractory for injecting gas from the bottom of a metallurgical container such as a converter or a ladle.
［従来の技術］
近年、転炉におけるガスの上下からの吹込によ
る精錬法が盛んになつている。ガスの底吹きをす
る耐火物の構造としては、羽口煉瓦に金属管を挿
入したもの、多数の貫通孔を有する不焼成または
焼成煉瓦等が知られている。[Prior Art] In recent years, refining methods that involve blowing gas from above and below in a converter have become popular. Known structures of refractories that allow gas to be blown from the bottom include those in which metal pipes are inserted into tuyere bricks, and unfired or fired bricks having a large number of through holes.
これ等のガス吹込用耐火物には低い温度のガス
が導入されるので、熱スポーリングに対する高い
抵抗性を有する耐火物を使用する必要があること
もよく知られている。また、従来のガス吹込用耐
火物において、所要のガス量を吹込むためにはガ
ス吹込孔の径をある程度大きくする必要がある。
ガス吹込孔を大きくすると溶湯がガス吹込孔中に
逆流し易くなるので、溶湯の逆流を阻止するため
にガスの圧力を保持し、常にガスを送給する必要
がある。即ち、転炉に溶鋼が受鋼されて出鋼する
までの間、不必要なガスを流していることにな
り、その為に生ずる溶鋼の不必要な動きによる炉
体耐火物の損傷と使用ガスの無駄な消費が問題と
なつている。 It is also well known that since low temperature gases are introduced into these gas-blown refractories, it is necessary to use refractories with high resistance to thermal spalling. Furthermore, in conventional gas injection refractories, the diameter of the gas injection hole must be increased to some extent in order to inject the required amount of gas.
When the gas blowing hole is made larger, the molten metal tends to flow back into the gas blowing hole, so it is necessary to maintain the gas pressure and constantly feed the gas to prevent the backflow of the molten metal. In other words, unnecessary gas is flowing from the time molten steel is received in the converter until it is tapped, resulting in damage to the furnace refractories and damage to the used gas due to unnecessary movement of the molten steel. Wasteful consumption has become a problem.
ガス吹込孔に送り込むガスのガス圧力を低くし
ても溶湯が逆流しない脱ガス炉用挿入プラグが実
公昭50−5849号公報に提案されている。該提案の
プラグは、板状、棒状又は筒状の耐火物を、外枠
内に軸方向に〓間があるように複数個組み合わせ
て挿入したもので、ガスは前記の〓間を通つて吹
込まれる。該提案にはガスが吹込まれる〓間の、
形状や寸法については全く述べられていないが、
細〓間と称されていることより、逆流が阻止され
るであろうことは充分想像される。しかしなが
ら、このようにして形成される細〓間を通してガ
スを吹込む場合には、流量を充分に確保すること
はできない。また、この〓間の断面積を大きくし
たのでは溶湯の逆流という問題が発生する。 Japanese Utility Model Publication No. 50-5849 proposes an insertion plug for a degassing furnace that prevents molten metal from flowing back even if the gas pressure of the gas sent into the gas injection hole is lowered. The proposed plug is a combination of a plurality of plate-shaped, rod-shaped, or cylindrical refractories inserted into an outer frame with gaps in the axial direction, and gas is blown through the gaps. be included. The proposal is gassed,
There is no mention of shape or dimensions, but
Since it is called a narrow gap, it is easy to imagine that backflow will be prevented. However, when gas is blown through the narrow gaps formed in this manner, a sufficient flow rate cannot be ensured. Furthermore, if the cross-sectional area between the two ends is increased, the problem of backflow of molten metal will occur.
また、特開昭55−145129号公報に、溝を設けた
耐火物を並置組み合わせて、又は耐火物間にスペ
ーサを介在させて組み合わせ、形成される貫通孔
にガスを吹込む通気性の良好な耐火物が提案され
ている。該提案においてもガス吹込孔の断面を如
何にすべきかの示唆はなく、特に溶湯の逆流防止
の為に如何にすべきかの知見を見出すことはでき
ない。該提案におけるガス吹込孔の断面積は特開
昭55−145129号公報にある数カ所の記載から１mm2
程度と推測される。このような吹込孔では前記の
プラグと同様に充分な流量を確保することは難し
い。また、スペーサを使用することはスペーサが
ずれたりしないようにする加工に手間がかかり、
施工が難しいという問題がある。また、間〓をど
の程度にしたら溶湯の逆流を阻止できるかについ
ての示唆は全くない。 In addition, Japanese Patent Application Laid-Open No. 55-145129 discloses a method with good ventilation in which gas is blown into the through holes formed by combining refractories with grooves arranged side by side or by interposing spacers between the refractories. Refractories have been proposed. Even in this proposal, there is no suggestion as to what the cross section of the gas blowing hole should be, and in particular, no knowledge has been found as to what should be done to prevent backflow of molten metal. The cross-sectional area of the gas injection hole in this proposal is 1 mm 2 from several descriptions in JP-A-55-145129.
It is estimated that the degree of With such a blow hole, it is difficult to ensure a sufficient flow rate as with the above-mentioned plug. In addition, using spacers requires time and effort to process to prevent the spacers from shifting.
The problem is that construction is difficult. Furthermore, there is no suggestion as to how much space should be used to prevent the backflow of molten metal.
ガス吹込ノズルにステンレス鋼のパイプを埋め
込んだり、耐火物の間に鋼板を挟み込んで鋼板に
隣接して貫通孔を設けたものが知られているが、
鋼材は溶湯にたいして濡れ易く、溶湯の逆流防止
効化を阻害するので問題点の解決にはならない。 It is known that a stainless steel pipe is embedded in the gas injection nozzle, or a steel plate is sandwiched between refractories and a through hole is provided adjacent to the steel plate.
Steel materials are easily wetted by molten metal, which hinders the effectiveness of preventing molten metal from flowing back, so this does not solve the problem.
［考案が解決しようとする課題］
本考案の目的は、少ない数の吹込孔で充分なガ
ス吹込量を確保することができ、しかもガス圧力
を低くしても溶湯が逆流する恐れのないガス吹込
用耐火物を提供することにある。[Problems to be solved by the invention] The purpose of the invention is to provide a gas injection system that can secure a sufficient amount of gas injection with a small number of injection holes, and that does not cause the risk of molten metal backflowing even when the gas pressure is low. Our objective is to provide refractories for use in
［課題を解決するための手段］
本考案は前述の問題点を解決すべくなされたも
のであり、本考案によるガス吹込用耐火物は、１
個の耐火物又はガス吹込方向に平行な面にて分割
され並置して組み合わされた複数個の耐火物から
なり、ガス吹込方向に貫通する短幅が0.3〜0.7mm
で、アスペクト比が20〜100の範囲にあるスリツ
ト状貫通孔が10〜30個設けられ、該スリツト状貫
通孔を通してガスが吹込まれる。[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and the gas injection refractory according to the present invention has the following features:
Consisting of a single refractory or a plurality of refractories divided on a plane parallel to the gas injection direction and combined in parallel, the short width penetrating in the gas injection direction is 0.3 to 0.7 mm.
10 to 30 slit-like through holes having an aspect ratio in the range of 20 to 100 are provided, and gas is blown through the slit-like through holes.
本考案のガス吹込用耐火物の好ましい態様で
は、前記スリツト状貫通孔が、前記複数個の耐火
物相互の組み合わせ面に設けられた溝により形成
されている。 In a preferred embodiment of the gas-injection refractory of the present invention, the slit-like through hole is formed by a groove provided in the mating surface of the plurality of refractories.
本考案によるガス吹込用耐火物の他の好ましい
態様では、前記スリツト状貫通孔の１つの断面積
が５mm2以上である。 In another preferred embodiment of the gas injection refractory according to the present invention, the cross-sectional area of one of the slit-like through holes is 5 mm 2 or more.
ガス吹込用耐火物を分割する方法としては、分
割面を互いに平行にする必要は必ずしもなく、直
角に交わる面で分割することも、さらにはガス吹
込方向に平行であれば、分割面は曲面であつても
支障がない。 When dividing gas-injected refractories, it is not always necessary to make the dividing planes parallel to each other; it is also possible to divide the dividing planes at right angles, or even to curve the dividing planes as long as they are parallel to the gas injection direction. There is no problem even if it happens.
更に、スリツト状貫通孔の断面形状は、長方形
の他、コーナー部分にＲが付いたものであつても
良い。 Further, the cross-sectional shape of the slit-like through hole may be rectangular or may have rounded corners.
［作用］
ここにおいてスリツトの短幅を0.3〜0.7mmとし
たのは、0.3mmより狭くするとガスの流量を十分
に稼げず、0.7mmより広くすると溶湯の逆流を防
ぐ効果が小さくなる。[Function] The reason why the short width of the slit is set to 0.3 to 0.7 mm is that if it is narrower than 0.3 mm, a sufficient gas flow rate cannot be obtained, and if it is wider than 0.7 mm, the effect of preventing backflow of molten metal will be reduced.
また、アスペクト比を20〜100としたのは、20
より小さくするとガス流量を稼ぐために貫通孔の
数を多くする必要が生じ、ガス吹込耐火物の製造
コストが大きくなり、100より大きくするとスリ
ツトの長い幅がガス吹込耐火物の外側寸法に近付
いてガス吹込用耐火物を製造し難くなる。 Also, the aspect ratio of 20 to 100 is 20
If it is made smaller, it will be necessary to increase the number of through holes to increase the gas flow rate, increasing the manufacturing cost of the gas-injected refractory, and if it is larger than 100, the long width of the slit will approach the outside dimension of the gas-injected refractory. It becomes difficult to manufacture refractories for gas injection.
本考案のガス吹込ノズルにおいて、ガス吹込孔
をスリツト状貫通孔とすることは重要な特徴であ
り、これにより吹込むガスの圧力を低く、極端な
場合にはほぼ零に近付けても溶湯が逆流しなくな
る。 An important feature of the gas blowing nozzle of the present invention is that the gas blowing hole is a slit-like through hole. I won't.
従つて、精錬工程においてガス吹込流量を任意
に増減することができる一方で充分なガスの流量
を確保することができる。 Therefore, while the gas blowing flow rate can be increased or decreased arbitrarily in the refining process, a sufficient gas flow rate can be ensured.
例えば、0.3mm×10.4mmのスリツト状貫通孔で
は２mmφの丸孔に相当するガス流量を得ることが
できる。 For example, a 0.3 mm x 10.4 mm slit-like through hole can provide a gas flow rate equivalent to a 2 mmφ round hole.
本考案のガス吹込用耐火物におけるスリツト状
貫通孔の数および寸法はガスの吹込量、吹込圧
力、その他の操業条件により決定されるが、スリ
ツト状貫通孔の数は10〜30個とするのが適当であ
り、これにより製鋼工程において必要とされるガ
ス吹き込み量の範囲を殆どカバーすることができ
る。 The number and dimensions of the slit-like through holes in the gas injection refractory of the present invention are determined by the amount of gas blown, the blowing pressure, and other operating conditions, but it is recommended that the number of slit-like through holes be 10 to 30. is suitable, and can cover most of the gas injection amount range required in the steelmaking process.
例えば転炉用に使用されている従来のガス吹込
耐火物では２mmφで長さ約1000mmの貫通孔が25個
設けられており、このガス吹込耐火物に４Kg／cm2
の窒素ガス圧力を加えると70Nm3／Ｈのガスが流
れる。これに対してスリツト状貫通孔の場合には
例えば0.5mm×20mmで長さ1000mmの貫通孔を21個
設けたガス吹込耐火物では４Kg／cm2の窒素ガスを
通じれば約2000Nm3／Ｈ以上のガスを流すことが
できる。ガス吹込耐火物の材質として溶湯に濡れ
にくい耐火物（通常、好んでマグネシアカーボン
煉瓦が使われる）で貫通孔の周囲を形成した上記
２つのガス吹込耐火物について溶湯の逆流防止効
果をみると、狭い貫通孔の中に入り込む溶湯の先
端の曲率が小さくなるほど溶湯の表面張力によつ
て貫通孔の中へ侵入（即ち逆流）し難くなる。こ
の原理によれば２mmφの貫通孔より0.5mm幅のス
リツト状貫通孔の方が遥かに逆流し難いことにな
る。 For example, a conventional gas-injected refractory used for converters has 25 through holes of 2 mmφ and approximately 1000 mm in length, and this gas-injected refractory has a capacity of 4 kg/ cm2.
When a nitrogen gas pressure of 70Nm 3 /H is applied, a gas of 70Nm 3 /H flows. On the other hand, in the case of slit-shaped through holes, for example, in a gas-injected refractory with 21 through holes of 0.5 mm x 20 mm and a length of 1000 mm, if 4 kg/cm 2 of nitrogen gas is passed through, it will exceed about 2000 Nm 3 /H. gas can flow. Looking at the effect of preventing molten metal backflow for the two gas-injected refractories mentioned above, in which the periphery of the through hole is formed with a refractory that does not easily get wet with molten metal (magnesia carbon bricks are usually preferred). The smaller the curvature of the tip of the molten metal that enters the narrow through-hole, the more difficult it is for the molten metal to enter the through-hole (that is, flow backward) due to the surface tension of the molten metal. According to this principle, a slit-shaped through hole with a width of 0.5 mm is much more difficult to prevent backflow than a through hole with a diameter of 2 mm.
ガス吹込耐火物を実際に使用する場合、溶湯の
逆流が一旦生ずると貫通孔が閉塞するため、ガス
を絶えず流し続けて溶湯の逆流を防ぐ必要がある
が、本考案のガス吹込用耐火物では上記の理由に
よりガス流量を大幅に絞つても溶湯の貫通孔中へ
の逆流が起きないので、ガスの消費量を大幅に少
なくでき、かつ使用時にガス吹込量を大流量から
極少量まで自由に調節することが可能となり、ガ
ス吹込用耐火物の使用可能期間も延びるという効
果が得られた。 When gas-injected refractories are actually used, once a backflow of molten metal occurs, the through holes become clogged, so it is necessary to keep gas flowing constantly to prevent the backflow of molten metal. For the above reasons, even if the gas flow rate is significantly reduced, the molten metal will not flow back into the through hole, so gas consumption can be significantly reduced, and the amount of gas blown during use can be freely adjusted from a large flow rate to a very small amount. It has become possible to make adjustments, and the usable period of the gas-injected refractories has been extended.
［実施例］
以下本考案のガス吹込用耐火物を実施例の図面
によつて詳述する。[Example] The gas injection refractory of the present invention will be described in detail below with reference to drawings of examples.
第１図〜第３図は本考案のガス吹込用耐火物の
一実施例を示すもので、ガス吹込用耐火物は１個
の円錐台状の耐火物からなり、この耐火物中には
ガス吹込方向に貫通する複数個の短幅が0.3〜0.7
mmで、アスペクト比が20〜100の範囲にあるスリ
ツト状貫通孔が設けられている。 Figures 1 to 3 show an embodiment of the gas injection refractory of the present invention. Multiple short widths penetrating in the blowing direction are 0.3 to 0.7
A slit-like through hole with an aspect ratio in the range of 20 to 100 mm is provided.
第１図は、このガス吹込用耐火物７が金属枠９
に嵌め込まれて取鍋の底に取り付けられた部分の
縦断面図であり、第２図は第１図のガス吹込用耐
火物をＡ−A′面で切断した断面の平面図である。
また、第１図は第２図におけるＢ−B′面による
断面図として示されている。このような形状を有
するガス吹込耐火物は、スリツト状貫通孔を放電
加工、レーザー加工等により耐火物に加工して形
成することも可能であるが、焼成により焼失する
材質の平板状の芯を耐火物原料中に埋め込んだ状
態で耐火物をプレスや鋳込みにより形成し、これ
を焼成することにより容易に製造することができ
る。 FIG. 1 shows that this gas injection refractory 7 is a metal frame 9.
2 is a longitudinal cross-sectional view of a portion of the refractory for gas injection shown in FIG. 1 taken along the line A-A'. FIG.
Further, FIG. 1 is shown as a sectional view taken along the line B-B' in FIG. 2. Gas-injected refractories having such a shape can be formed by machining slit-like through holes into the refractory by electrical discharge machining, laser machining, etc., but it is also possible to form gas-injected refractories with a flat core made of a material that is burnt out during firing. It can be easily manufactured by forming a refractory by pressing or casting in a state embedded in a refractory raw material, and firing this.
このガス吹込用耐火物の炉底あるいは耐火物間
への嵌装には、通常金属枠の使用に関係なく、周
囲の耐火物との間に融着して一体化しにくいモル
タルを挟む。 To fit this gas injection refractory into the hearth bottom or between refractories, mortar, which is difficult to fuse and integrate with surrounding refractories, is usually inserted, regardless of whether a metal frame is used.
第３図は第２図におけるスリツト状貫通孔の１
つを拡大した図であり、アスペクト比を説明する
図である。即ち、アスペクト比はスリツト状貫通
孔の長い幅ａに対する短幅ｂの比、ａ／ｂであ
る。 Figure 3 shows one of the slit-like through holes in Figure 2.
FIG. 2 is an enlarged view of one of the two, and is a diagram illustrating the aspect ratio. That is, the aspect ratio is the ratio of the short width b to the long width a of the slit-like through hole, or a/b.
ガス吹込耐火物に隣接して、金属枠の底部に、
金属枠９に取り付けられたガス導入管４から供給
されるガスがガス吹込耐火物の貫通孔の全てから
吹込まれるように空域６が設けられている。 At the bottom of the metal frame, adjacent to the gas-blown refractory,
An air space 6 is provided so that gas supplied from a gas introduction pipe 4 attached to a metal frame 9 is blown in through all the through holes of the gas injection refractory.
第４図〜第６図は、本考案のガス吹込用耐火物
の他の好ましい例であり、複数個の耐火物からな
るものである。 4 to 6 show other preferred examples of the gas injection refractories of the present invention, which are composed of a plurality of refractories.
第４図において、ガス吹込用耐火物７はガス吹
込方向に平行な平面によつて分割され、並置して
組み合わされた複数個の耐火物からなつており、
ガス導入管４を取り付けた鋼鉄製の金属枠９内に
嵌装されている。金属枠６の底部には、導入ガス
を耐火物の全ての貫通孔から吹込めるように空域
６が設けられている。第５図は第４図のＣ−C′面
による断面の平面図であり、分割されたそれぞれ
の板状耐火物の片面にスリツト状貫通孔８を形成
する溝が加工されている。第４図は第５図におけ
るＤ−D′面による縦断面図である。第６図は、
第４図のＣ−C′面による断面の平面図であり、こ
の実施例では、分割された耐火物の表面に溝を刻
んだものと平坦なものを接合してスリツト状貫通
孔を形成する。 In FIG. 4, the gas injection refractory 7 is divided by a plane parallel to the gas injection direction, and consists of a plurality of refractories arranged side by side and combined.
It is fitted in a metal frame 9 made of steel to which a gas introduction pipe 4 is attached. An air space 6 is provided at the bottom of the metal frame 6 so that the introduction gas can be injected through all the through holes of the refractory. FIG. 5 is a plan view of a cross section taken along the line C-C' in FIG. 4, in which grooves for forming slit-like through holes 8 are machined on one side of each of the divided plate-shaped refractories. FIG. 4 is a longitudinal sectional view taken along line DD' in FIG. 5. Figure 6 shows
It is a plan view of a cross section taken along the plane C-C' in FIG. 4, and in this embodiment, a slit-like through hole is formed by joining a grooved part and a flat part on the surface of the divided refractory. .
このタイプのガス吹込用耐火物には、その材質
として、耐蝕性があり緻密な組織を有するものが
適しており、例えばダイヤモンドカツターで切断
し、ダイヤモンド工具で溝を加工した板状の溶融
鋳造耐火物を組合わせて構成したものを用いるこ
ともできる。 For this type of gas-injected refractory, materials that are corrosion resistant and have a dense structure are suitable, such as plate-shaped molten castings that are cut with a diamond cutter and grooved with a diamond tool. A combination of refractories may also be used.
また、溶湯と濡れにくく耐蝕性に優れた緻密な
MgO−Ｃ系耐火物が適している。 In addition, it is a dense material that is difficult to get wet with molten metal and has excellent corrosion resistance.
MgO-C refractories are suitable.
試験例として、このMgO−Ｃ系耐火物により
ガス吹込用耐火物を製作し窒素ガスを流してみ
た。即ち、スリツト状貫通孔の断面の寸法を0.5
mm×20mmとし、長さ約1000mmの貫通孔を21個設
け、スリツト状貫通孔の断面積の合計を210mm2と
して、15℃で４Kg／cm2の圧力の窒素ガスを通じた
ところ201Nm3／Hrのガスを流すことができた。 As a test example, a gas injection refractory was manufactured using this MgO-C refractory and nitrogen gas was flowed through it. In other words, the cross-sectional dimension of the slit-like through hole is 0.5
mm x 20 mm, 21 through holes with a length of approximately 1000 mm were provided, and the total cross-sectional area of the slit-like through holes was 210 mm 2. When nitrogen gas was passed at a pressure of 4 Kg/cm 2 at 15°C, the result was 201 Nm 3 /Hr. gas could flow.
他方、貫通孔の寸法が２mmφで長さが約1000mm
のものを25個設けた従来のガス吹込用耐火物で
は、４Kg／cm2の窒素ガスを通じても約70Nm3／
Hrの窒素ガスしか流すことができない。 On the other hand, the dimensions of the through hole are 2mmφ and the length is approximately 1000mm.
Conventional gas - injected refractories equipped with 25 gas-injected refractories produce approximately 70Nm 3 /
Only Hr of nitrogen gas can flow.
この本考案のガス吹込用耐火物は、窒素ガスの
ガス圧力を２Kg／cm2、６Kg／cm2とするとき、それ
ぞれ120Nm3／Hr、305Nm3／Hrのガスを流すこ
とができた。 This gas injection refractory of the present invention was able to flow gases of 120 Nm 3 /Hr and 305 Nm 3 /Hr when the gas pressures of nitrogen gas were 2 Kg/cm 2 and 6 Kg/cm 2 , respectively.
このガス吹込用耐火物をステンレス鋼精錬用の
40トン転炉の炉底に取り付けてガス吹込を試み
た。ガスの導入圧力を種々変化させたところ、低
圧力で低流量のときも溶湯の逆流がなく、従つて
ガス吹込孔の閉塞は全く認められず、かつ充分な
ガス吹込量を確保することができた。 This gas injection refractory is used for stainless steel refining.
We attached it to the bottom of a 40-ton converter and attempted to inject gas into it. When we varied the gas introduction pressure, we found that there was no backflow of molten metal even at low pressure and low flow rate, and therefore no clogging of the gas injection hole was observed, and we were able to secure a sufficient amount of gas injection. Ta.
［考案の効果］
以上の如く、本考案によるガス吹込用耐火物は
溶湯の貫通孔中への逆流を抑止する効果を有して
おり、転炉等に使用する場合吹込むガス量の調節
が容易であつて、無駄に消費されていたガスを大
幅に節減することができるという効果を有してい
る。[Effect of the invention] As described above, the gas injection refractory according to the invention has the effect of suppressing the backflow of molten metal into the through hole, and when used in a converter, etc., the amount of gas injected can be adjusted. It is easy to use and has the effect of significantly reducing the amount of gas that would otherwise have been wasted.
更に、細長いスリツト状貫通孔とすることによ
り、貫通孔の数が少なくても充分な量のガスの吹
込量を確保でき、貫通孔の数を少なくできるので
ガス吹込用耐火物の製造も容易になる。 Furthermore, by using elongated slit-like through holes, a sufficient amount of gas can be blown in even with a small number of through holes, and since the number of through holes can be reduced, it is easier to manufacture refractories for gas injection. Become.
第１図は本考案のガス吹込用耐火物を取鍋の底
に取り付けた状態の部分縦断面図であり、第２図
は第１図のガス吹込用耐火物の部分をＡ−A′の
面で切つた平面図である。第３図は第２図のスリ
ツト状貫通孔の１つを拡大して示しており、スリ
ツト状貫通孔の短幅ｂにたいする長い幅ａの比で
あるアスペクト比ａ／ｂを説明する図である。第
４図〜第６図は本考案の他の実施例の概念図であ
り、第４図はガス吹込用耐火物の縦断面図、第５
図及び第６図は第４図におけるＣ−C′面により切
断した断面の平面図であり、第６図は溝の加工面
が第５図の場合と異なつている。
図において、１は転炉の外皮、２は周囲の耐火
物、４はガス導入管、６は空域、７はガス吹込用
耐火物、８はスリツト状貫通孔、９は金属枠であ
る。
Fig. 1 is a partial vertical sectional view of the gas injection refractory of the present invention attached to the bottom of a ladle, and Fig. 2 shows the part of the gas injection refractory of Fig. 1 taken along A-A'. FIG. FIG. 3 shows an enlarged view of one of the slit-like through-holes in FIG. 2, and is a diagram for explaining the aspect ratio a/b, which is the ratio of the long width a to the short width b of the slit-like through-hole. . 4 to 6 are conceptual diagrams of other embodiments of the present invention, and FIG. 4 is a longitudinal cross-sectional view of a refractory for gas injection, and FIG.
This figure and FIG. 6 are plan views of a cross section cut along the line C-C' in FIG. 4, and FIG. 6 is different from the case in FIG. 5 in the processed surface of the groove. In the figure, 1 is the outer skin of the converter, 2 is the surrounding refractory, 4 is the gas introduction pipe, 6 is the air space, 7 is the gas injection refractory, 8 is the slit-shaped through hole, and 9 is the metal frame.
Claims (1)
て分割され並置して組合わされた複数個の耐火
物からなり、ガス吹込方向に貫通する短幅が
0.3〜0.7mmで、アスペクト比が20〜100の範囲
にあるスリツト状貫通孔が10〜30個設けられ、
該スリツト状貫通孔を通してガスが吹込まれる
ガス吹込用耐火物。 (2) 前記スリツト状貫通孔が、前記複数個の耐火
物相互の組合わせ面に設けられた溝により形成
されている実用新案登録請求の範囲第１項のガ
ス吹込用耐火物。[Claims for Utility Model Registration] (1) A short width that penetrates in the gas injection direction, consisting of one refractory or multiple refractories that are divided in a plane parallel to the gas injection direction and combined in parallel. but
10 to 30 slit-like through holes with a diameter of 0.3 to 0.7 mm and an aspect ratio of 20 to 100 are provided.
A refractory for gas injection into which gas is blown through the slit-like through hole. (2) The gas injection refractory according to claim 1, wherein the slit-like through hole is formed by a groove provided in the mating surface of the plurality of refractories.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5874783U JPS59165760U (en) | 1983-04-21 | 1983-04-21 | Refractories for gas injection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5874783U JPS59165760U (en) | 1983-04-21 | 1983-04-21 | Refractories for gas injection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59165760U JPS59165760U (en) | 1984-11-07 |
| JPH034434Y2 true JPH034434Y2 (en) | 1991-02-05 |
Family
ID=30189021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5874783U Granted JPS59165760U (en) | 1983-04-21 | 1983-04-21 | Refractories for gas injection |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59165760U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0222138Y2 (en) * | 1986-10-22 | 1990-06-14 |
-
1983
- 1983-04-21 JP JP5874783U patent/JPS59165760U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59165760U (en) | 1984-11-07 |
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