JPS6217004B2 - - Google Patents
Info
- Publication number
- JPS6217004B2 JPS6217004B2 JP20998683A JP20998683A JPS6217004B2 JP S6217004 B2 JPS6217004 B2 JP S6217004B2 JP 20998683 A JP20998683 A JP 20998683A JP 20998683 A JP20998683 A JP 20998683A JP S6217004 B2 JPS6217004 B2 JP S6217004B2
- Authority
- JP
- Japan
- Prior art keywords
- tuyere
- refractory
- gas
- small
- diameter metal
- 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
- 239000002184 metal Substances 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000007670 refining Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 26
- 239000000463 material Substances 0.000 description 9
- 239000011819 refractory material Substances 0.000 description 6
- 238000007664 blowing Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
- B22D1/005—Injection assemblies therefor
Description
【発明の詳細な説明】
本発明は、溶解精錬炉または反応容器用ガス吹
込み羽口に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas injection tuyere for a melting and refining furnace or reaction vessel.
従来、冶金操業において溶融金属などの精錬処
理、脱ガス処理または撹拌などの目的のために、
溶融金属容器の主として底部に耐火物からなるガ
ス吹込み用の羽口を設けて、溶融金属中に種々の
ガスを吹込むことはよく知られており、また、転
炉などの精錬炉においても炉の底部からガスを吹
込む技術が近年確立されるに至つている。 Conventionally, in metallurgical operations, for purposes such as refining, degassing, or stirring of molten metal,
It is well known that various gases are injected into the molten metal by providing gas injection tuyeres made of refractories mainly at the bottom of the molten metal container, and also in smelting furnaces such as converters. In recent years, a technology for blowing gas from the bottom of the furnace has been established.
これら溶融金属容器の底部に装着されるガス吹
込み用の主として耐火物からなる羽口の構造につ
き、従来次の如き羽口が知られている。 Regarding the structure of the tuyere mainly made of refractory material for blowing gas, which is attached to the bottom of the molten metal container, the following tuyeres are conventionally known.
Ａ 溶融金属が装入されている反応容器の底部に
装着される羽口であつて、吹込みガスを通過さ
せる複数本の小径金属パイプが填装されている
耐火物よりなる羽口。A. A tuyere that is attached to the bottom of a reaction vessel containing molten metal, and is made of refractory material and is filled with a plurality of small diameter metal pipes that allow the blown gas to pass through.
Ｂ 転炉等の溶解精錬炉の底部に装着される耐火
物からなる羽口であつて、羽口を構成する母材
耐火物として高耐用性材質であるMgO−Ｃが
用いられている羽口。B A tuyere made of refractory that is installed at the bottom of a melting and refining furnace such as a converter, and in which MgO-C, a highly durable material, is used as the base refractory that makes up the tuyere. .
上記Ａ項記載の羽口は、耐火物中に填装される
複数本の小径金属パイプは内径が0.1〜５mm程度
のパイプ数十本からなり、大流量のガスを通過さ
せることができると共に、吹込みガス量が零近く
になつても炉内に開口しているパイプの開口部が
溶融金属によつて閉塞されないことを特徴とする
ものである。また上記Ｂ項記載の羽口においては
高耐用性材質であるMgO−Ｃ耐火物が耐火物の
母材として使用されているため、耐火性に優れて
いることを特徴とするものである。 The tuyere described in item A above consists of several dozen small-diameter metal pipes with an inner diameter of about 0.1 to 5 mm packed in the refractory, and is capable of passing a large amount of gas. It is characterized in that the opening of the pipe opening into the furnace is not blocked by molten metal even when the amount of blown gas is close to zero. Further, the tuyere described in item B above uses MgO-C refractory, which is a highly durable material, as the base material of the refractory, and is therefore characterized by excellent fire resistance.
そこで、本発明者らは上記Ｂ項記載の耐火物を
母材とする耐火物を上記Ａ項記載の構造の羽口に
使用すれば、前記Ａ・Ｂ項に示された両特徴を兼
備したより優秀な羽口を当然得ることができると
の確信に基いて、前記着想に沿つた羽口を製作し
転炉に装着して実用試験に供したところ設計した
底吹ガス流量が得られず、底吹ノズルとしてその
機能を十分に果たし得なかつた。 Therefore, the present inventors believe that if a refractory whose base material is the refractory described in Section B above is used for the tuyeres of the structure described in Section A above, it will have both the characteristics shown in Sections A and B above. Based on the belief that a more excellent tuyere could be obtained, a tuyere based on the above idea was manufactured, installed in a converter, and subjected to a practical test, but the designed bottom-blown gas flow rate could not be obtained. , it could not fully fulfill its function as a bottom blowing nozzle.
本発明は、従来構造よりなる羽口ならびに前記
本発明者らによる実用試験において見られた欠点
を除去・改善した羽口を提供することを目的とす
るものであつて、特許請求の範囲記載のガス吹込
み羽口を提供することによつて前記目的を達成す
ることができる。 The present invention aims to provide a tuyere having a conventional structure as well as a tuyere that eliminates and improves the drawbacks observed in the practical tests conducted by the present inventors. This objective can be achieved by providing gas blowing tuyeres.
次に本発明を詳細に説明する。 Next, the present invention will be explained in detail.
本発明者らは、上記予想外のトラブルに逢着し
た後、炉操業における羽口からのガス吹込み状況
を詳細に検討した結果、炉及び羽口の使用開始後
の炉の操業回数が多くなるに従つて炉へ供給し得
る実質ガス量が少なくなることを知見するに至つ
た。本発明者らはこの現象を検討した結果、
MgO−Ｃ質耐火物は耐火性の点では優れている
が従来の羽口用の耐火物と比較して熱伝達率が高
いためMgO−Ｃ質耐火物を用いた羽口は使用開
始後の時間の経過に伴う耐火物の温度上昇が速
く、同耐火物中に填装されている小径金属パイプ
の温度も上記耐火物の温度に伴つて上昇し、その
結果前記小径金属パイプの内を流れるガスが加熱
されて膨張し、パイプ内を流れる実質ガス量が減
少するいわゆる熱チヨーク現象が生起しているこ
とに想到した。よつて、小径金属パイプにつきテ
ーブルテストを行なつたところ、前記パイプ内を
流れ得る実質ガス量はパイプ壁から受ける熱量に
よつて変化することをたしかめることができた。
よつて熱チヨーク現象を防止するには、耐火物か
ら前記小径金属パイプへの熱伝達をできるだけ抑
制することが必要であり、本発明者らは前記小径
金属パイプの外面と前記耐火物との間に断熱層を
介在させたところ、上記熱チヨーク現象を顕著に
防止することができるに至つた。 After encountering the above-mentioned unexpected trouble, the inventors of the present invention conducted a detailed study on the situation of gas injection from the tuyere during furnace operation. As a result, the number of operations of the furnace increases after the furnace and the tuyeres are started to be used. It has been found that the actual amount of gas that can be supplied to the furnace decreases accordingly. The inventors investigated this phenomenon and found that
Although MgO-C refractories have excellent fire resistance, they have a higher heat transfer coefficient than conventional tuyere refractories, so tuyeres using MgO-C refractories are The temperature of the refractory increases quickly with the passage of time, and the temperature of the small-diameter metal pipe filled in the refractory also rises with the temperature of the refractory, resulting in a flow inside the small-diameter metal pipe. We have come to the conclusion that the so-called thermal choke phenomenon occurs, in which gas is heated and expands, reducing the actual amount of gas flowing through the pipe. Therefore, by performing a table test on a small-diameter metal pipe, it was confirmed that the actual amount of gas that can flow inside the pipe changes depending on the amount of heat received from the pipe wall.
Therefore, in order to prevent the heat-choke phenomenon, it is necessary to suppress the heat transfer from the refractory to the small-diameter metal pipe as much as possible, and the present inventors have proposed that the heat transfer between the outer surface of the small-diameter metal pipe and the refractory When a heat insulating layer was interposed between the two, it was possible to significantly prevent the above-mentioned thermal breakdown phenomenon.
次に本発明を図面について詳細に説明する。 The invention will now be explained in detail with reference to the drawings.
第１図は本発明のガス吹込み羽口の縦断面図、
第２図は第１図−矢視平面図、第３図は第１
図中〇印にて囲つた部分Ｅの拡大縦断面図であ
る。 FIG. 1 is a longitudinal cross-sectional view of the gas injection tuyere of the present invention;
Figure 2 is a plan view of Figure 1 - arrow direction, Figure 3 is a plan view of Figure 1
It is an enlarged vertical cross-sectional view of a portion E surrounded by a circle in the figure.
本発明の羽口は、ガス供給管１の上端に、供給
されたガス用のサージタンクの役目をする蓄気室
２が連結され、蓄気室２の上方に設けられる
MgO−Ｃを母材とする耐火物３内に複数本の小
径金属パイプ４が填装され、複数の小径金属パイ
プ４の下端はそれぞれ蓄気室２内に開口するよう
に蓄気室２に一体結合されており、一方小径金属
パイプ４の上端は羽口の先端で炉内あるいは容器
内に開口し、小径金属パイプ４の外面と耐火物３
との間に断熱層５を介在させている。 In the tuyere of the present invention, an air storage chamber 2 that serves as a surge tank for the supplied gas is connected to the upper end of a gas supply pipe 1, and is provided above the air storage chamber 2.
A plurality of small-diameter metal pipes 4 are loaded into a refractory 3 whose base material is MgO-C, and the lower ends of the plurality of small-diameter metal pipes 4 are connected to the air storage chamber 2 so as to open into the air storage chamber 2, respectively. On the other hand, the upper end of the small diameter metal pipe 4 opens into the furnace or container at the tip of the tuyere, and the outer surface of the small diameter metal pipe 4 and the refractory 3
A heat insulating layer 5 is interposed between the two.
断熱層５は炉中のスラグに対して高耐食性であ
り、かつ低熱伝導率である金属酸化物を主体とす
るものである。小径金属パイプ４の表面を断熱層
材によつて被覆するには、泥漿状態の前記酸化物
中には前記パイプ４を浸漬するか、あるいは泥漿
状態の前記酸化物を前記パイプ４に塗布し、被覆
断熱層の厚さを0.1〜５mm程度とする。後述の実
施例の断熱層５は単味のMgO粉末を水ガラスを
バインダーとして泥漿状態となし、蓄気室２に一
体に結合された小径金属パイプ群を前記泥漿状態
の断熱層材中に浸漬することにより被覆したもの
である。低熱伝導率の金属酸化物としては他にア
ルミナ、ジルコニヤ、シリカなどがあり、使用条
件に応じてこれらを単味あるいは混合して使用す
ることができる。バインダーとしては他にレジン
など通常使用されるものを適宜使用することがで
きる。 The heat insulating layer 5 is mainly made of metal oxide, which has high corrosion resistance against slag in the furnace and low thermal conductivity. In order to cover the surface of the small diameter metal pipe 4 with a heat insulating layer material, the pipe 4 is immersed in the oxide in a slurry state, or the oxide in a slurry state is applied to the pipe 4, The thickness of the covering insulation layer is approximately 0.1 to 5 mm. The heat insulating layer 5 of the embodiment described later is made by forming a simple MgO powder into a slurry using water glass as a binder, and immersing a group of small diameter metal pipes integrally connected to the air storage chamber 2 into the heat insulating layer material in the slurry state. It is coated by Other metal oxides with low thermal conductivity include alumina, zirconia, and silica, and these can be used alone or in combination depending on the conditions of use. As the binder, other commonly used binders such as resin can be used as appropriate.
次に本発明の実施例について説明する。 Next, examples of the present invention will be described.
実施例
製鋼工場の180トン転炉に装着の８本の羽口に
ついて、炉回数（ヒート）と最大ガス流量Ｎm3／
minとの関係を調べたところ、従来操業における
前記関係は第４図の帯域Ａによつて示すようにな
つた。前記従来の羽口と形状は全く同一ながら小
径金属パイプを断熱層により被覆した点のみを異
にする本発明の羽口を用いて操業した前記関係は
第４図の帯域Ｂによつて示すようになつた。同図
において両羽口は使用開始時には最大ガス量には
差はないが、例えば炉使用回数が400回になると
本発明と従来の羽口の最大ガス量（Ｎm3／min）
はそれぞれ13.2〜10.3：8.6〜4.6であり、また
1000回のときは13.5〜10.5：7.0〜3.4であり、本
発明の羽口の最大ガス流量Ｎm3／minは従来のそ
れに比し格段に多いことが判る。Example: Furnace frequency (heat) and maximum gas flow rate Nm 3 /
When the relationship with min was investigated, the relationship in conventional operation was as shown by band A in FIG. The above relationship is shown by zone B in FIG. 4 when the tuyere of the present invention is operated using the tuyere of the present invention, which has the same shape as the conventional tuyere but differs only in that a small diameter metal pipe is covered with a heat insulating layer. It became. In the same figure, there is no difference in the maximum gas volume between the two tuyeres at the beginning of use, but when the furnace is used 400 times, for example, the maximum gas volume (Nm 3 /min) between the present invention and the conventional tuyere changes.
are 13.2-10.3:8.6-4.6, respectively, and
At 1000 times, the ratio is 13.5 to 10.5: 7.0 to 3.4, and it can be seen that the maximum gas flow rate of the tuyere of the present invention, Nm 3 /min, is much higher than that of the conventional one.
以上に述べた如く、本発明のガス吹込み羽口を
装着した溶解精錬炉または反応容器においては、
ガス吹込み量の変動が少なく、安定した操業が可
能となる。さらに羽口の母材を高耐用性材質であ
るMgO−Ｃ耐火物とすることにより長寿命の羽
口を得ることも可能となる。 As described above, in the melting and refining furnace or reaction vessel equipped with the gas injection tuyeres of the present invention,
There is little variation in the amount of gas blown, allowing stable operation. Furthermore, by using MgO-C refractory, which is a highly durable material, as the base material of the tuyere, it is possible to obtain a tuyere with a long life.
第１図は本発明のガス吹込み羽口の縦断面図、
第２図は第１図−矢視平面図、第３図は第１
図中〇印にて囲つた部分Ｅの拡大縦断面図、第４
図は本発明の羽口と従来の羽口につき炉操業成績
の比較図である。
１……ガス供給管、２……蓄気室、３……耐火
物、４……小径金属パイプ、５……断熱層。
FIG. 1 is a longitudinal cross-sectional view of the gas injection tuyere of the present invention;
Figure 2 is a plan view of Figure 1 - arrow direction, Figure 3 is a plan view of Figure 1
Enlarged vertical cross-sectional view of the part E circled with a circle in the figure, No. 4
The figure is a comparison diagram of furnace operation results between the tuyere of the present invention and a conventional tuyere. 1... Gas supply pipe, 2... Air storage chamber, 3... Refractory, 4... Small diameter metal pipe, 5... Heat insulation layer.
Claims (1)
耐火物中に填装されてなる溶解精錬炉または反応
容器用ガス羽口において、前記小径金属パイプの
外面と前記耐火物との間に断熱層を介在させてな
る溶解精錬炉または反応容器用ガス吹込み羽口。1. In a gas tuyere for a melting and refining furnace or reaction vessel in which a plurality of small-diameter metal pipes for passing gas are packed in a refractory, a heat insulating layer is provided between the outer surface of the small-diameter metal pipes and the refractory. Gas injection tuyeres for melting and refining furnaces or reaction vessels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20998683A JPS60103108A (en) | 1983-11-10 | 1983-11-10 | Gas blowing tuyere for melting and refining furnace or reaction vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20998683A JPS60103108A (en) | 1983-11-10 | 1983-11-10 | Gas blowing tuyere for melting and refining furnace or reaction vessel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60103108A JPS60103108A (en) | 1985-06-07 |
| JPS6217004B2 true JPS6217004B2 (en) | 1987-04-15 |
Family
ID=16581965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20998683A Granted JPS60103108A (en) | 1983-11-10 | 1983-11-10 | Gas blowing tuyere for melting and refining furnace or reaction vessel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60103108A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5940758A (en) * | 1982-08-31 | 1984-03-06 | Canon Inc | Reader of original sheet |
| JPS62227027A (en) * | 1986-03-28 | 1987-10-06 | Tooa Steel Kk | Electric furnace and tuyere brick for bottom blowing |
| US4735400A (en) * | 1986-03-28 | 1988-04-05 | Toshin Steel Co., Ltd. | Plug for a refining apparatus |
-
1983
- 1983-11-10 JP JP20998683A patent/JPS60103108A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60103108A (en) | 1985-06-07 |
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