JPH032205B2 - - Google Patents
Info
- Publication number
- JPH032205B2 JPH032205B2 JP60483A JP60483A JPH032205B2 JP H032205 B2 JPH032205 B2 JP H032205B2 JP 60483 A JP60483 A JP 60483A JP 60483 A JP60483 A JP 60483A JP H032205 B2 JPH032205 B2 JP H032205B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- gas
- tuyere
- inner tube
- 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.)
- Expired
Links
- 239000007789 gas Substances 0.000 claims description 22
- 238000007670 refining Methods 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 9
- 239000000112 cooling gas Substances 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 7
- 239000012159 carrier gas Substances 0.000 claims description 6
- 239000008187 granular material Substances 0.000 claims description 4
- 230000004907 flux Effects 0.000 description 23
- 238000007664 blowing Methods 0.000 description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 10
- 239000011148 porous material Substances 0.000 description 8
- 235000012255 calcium oxide Nutrition 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- -1 and Ar Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
【発明の詳細な説明】
本発明は溶融金属精錬容器用の羽口に関し、特
にフラツクスのような粉粒体を、精錬ガスをキヤ
リヤガスとして溶融金属浴中に吹込む際における
該粉粒体の管壁への付着を防止することができる
ような羽口の提案を目的とする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tuyere for a molten metal refining vessel, and in particular to a tuyere for tuyere for a molten metal refining vessel, particularly when tuyeres such as flux are blown into a molten metal bath using refining gas as a carrier gas. The purpose is to propose a tuyere that can prevent adhesion to walls.
従来の溶融金属浴中に精錬ガスを吹込む同芯２
重管構造の羽口において、内管の中心流路から酸
素・不活性ガスまたはこれらの混合ガスと粉粒状
のフラツクス、外管と内管との間隙の外環状流路
からは羽口を保護するための冷却ガスをそれぞれ
流す場合に、フラツクス吹込量を増大させると、
内管の壁部にフラツクスが付着し、内管の有効径
を保持することが出来なくなり、そのまま放置し
て吹込みを継続すれば、内管の流量を確保するた
めには羽口吹込ガスの圧力が上昇してくる。甚し
い場合には、フラツクスにより内管が閉塞するよ
うなことになり、操業の継続が困難となることす
らある。 Concentric 2 for blowing refining gas into a conventional molten metal bath
In a tuyere with a heavy pipe structure, oxygen, inert gas, or a mixture of these gases and granular flux are protected from the central flow path of the inner pipe, and the tuyere is protected from the outer annular flow path in the gap between the outer and inner pipes. When flowing cooling gas for each, increasing the amount of flux injection,
Flux adheres to the wall of the inner tube, making it impossible to maintain the effective diameter of the inner tube, and if you continue blowing if left as is, it will be necessary to increase the tuyere blowing gas to ensure the flow rate of the inner tube. Pressure is rising. In severe cases, the flux may cause the inner pipe to become clogged, making it difficult to continue operations.
本発明は上記従来羽口によつてフラツクス等の
粉粒体を吹込む場合に、羽口の管内面にフラツク
スが付着して管の有効径が小さくなる欠点を防止
するために提案されたものであつて、その骨子は
羽口を内管・中管・外管の同芯３重管構造とし、
内管に中管と連通する多数の小孔を設けることに
よつて、粉粒体が内管に付着することを防止する
ことができ、従来の問題点を解決するに至つたの
である。 The present invention has been proposed in order to prevent the drawback that when granular materials such as flux are injected through the conventional tuyere, the flux adheres to the inner surface of the tube of the tuyere, reducing the effective diameter of the tube. The gist of this is that the tuyere has a concentric triple tube structure consisting of an inner tube, a middle tube, and an outer tube.
By providing a large number of small holes in the inner tube that communicate with the middle tube, it is possible to prevent powder from adhering to the inner tube, thus solving the conventional problems.
本発明は外環状流路より冷却ガスを吹込みつ
つ、内管の中心流路より精錬ガスと粉粒物質とを
溶融金属浴中に吹込む羽口の構造を、同芯３重管
構造の内管・中管および外管で構成し、内管には
中管との間を連通する多数の小口径連通孔を全面
にわたつて設けた構造とする。この３重管構造羽
口の使用に際しては、精錬ガスをキヤリヤガスと
してフラツクスのような粉粒体を、この内管の中
心流路より溶融金属浴中に吹込む。また、内管と
中管との間隙の内環状流路には、上記中心流路を
流れるキヤリヤガスよりも高圧の精錬ガスを流
し、前記連通孔を経て内管内へ適量の精錬ガスが
流れ込むようにして、内管の内面に粉粒体の付着
することを防止する。なお、中管と外管との間隙
の外環状流路には冷却ガスを流して羽口を保護す
ることは従来通りである。 The present invention has a concentric triple-pipe structure in which the tuyere structure blows refining gas and granular material into the molten metal bath from the central flow path of the inner tube while blowing cooling gas through the outer annular flow path. It is composed of an inner tube, a middle tube, and an outer tube, and the inner tube has a structure in which a large number of small diameter communication holes are provided throughout the entire surface to communicate with the middle tube. When using this triple-tube structure tuyere, powder such as flux is blown into the molten metal bath through the central flow path of the inner tube, using the refining gas as a carrier gas. In addition, refining gas having a higher pressure than the carrier gas flowing through the central flow path is passed through the inner annular flow path in the gap between the inner pipe and the middle pipe, so that an appropriate amount of refining gas flows into the inner pipe through the communication hole. This prevents particles from adhering to the inner surface of the inner tube. Note that it is conventional to flow cooling gas through the outer annular flow path in the gap between the inner tube and the outer tube to protect the tuyeres.
以下に、本発明の詳細を、その好適実施例の上
底吹転炉の羽口を考慮しつつ、具体的に説明す
る。 The details of the present invention will be specifically explained below, taking into consideration the tuyere of the top-bottom blowing converter of a preferred embodiment thereof.
現在の２重管構造の羽口で、フラツクスなどの
粉粒体を精錬ガスをキヤリヤガスとして溶融金属
浴中に吹込む際の問題点は、前述のようにフラツ
クスが羽口管の内壁に付着して内管圧を上げる結
果となり、操業を阻害する一つの原因となること
である。 The problem with blowing powder such as flux into a molten metal bath using refining gas as a carrier gas with current double-tube structure tuyeres is that, as mentioned above, the flux adheres to the inner wall of the tuyere tube. This results in an increase in internal pipe pressure, which is one of the causes of hindering operations.
この点を解決するため研究・実験を重ねた結
果、第１図に示すような３重管構造の羽口を提供
するに至つたのである。すなわち、内管には多数
の連通孔を設け、酸素・窒素・Arなどの単独ま
たは混合ガスと生石灰などのフラツクスを流し、
内管と中管との間隙の内環状流路にはフラツクス
などを含まない内管のガスと同種のガスを流し、
かつ内管圧よりもガス圧を高圧に維持する。な
お、中管と外管との隙間には従来通り冷却ガスを
流して羽口の過熱を防いで保護する。 As a result of repeated research and experiments to solve this problem, we were able to provide a tuyere with a triple-pipe structure as shown in Figure 1. In other words, a large number of communication holes are provided in the inner tube to allow single or mixed gases such as oxygen, nitrogen, and Ar, and fluxes such as quicklime to flow.
A gas of the same type as the gas in the inner tube, which does not contain flux, is passed through the inner annular flow path in the gap between the inner tube and the middle tube.
In addition, the gas pressure is maintained at a higher pressure than the internal pipe pressure. As usual, cooling gas is flowed through the gap between the inner and outer tubes to prevent and protect the tuyere from overheating.
このようにすることにより、内管の中心流と内
環状流路との圧力差のため、内管壁に設けた連通
孔を通して内管内へガスが流入する。その効果に
よつて、内管壁内面にフラツクスが付着するのが
防止される。 By doing so, gas flows into the inner tube through the communication hole provided in the inner tube wall due to the pressure difference between the center flow of the inner tube and the inner annular flow path. This effect prevents flux from adhering to the inner surface of the inner tube wall.
ここで考慮しなければならないのは、内管に設
ける連通孔の形状・大きさおよび分布状態であ
る。現在使用されているフラツクスの粒度は−
250メツシユのものが全量に対して50％以上占め
るものが良いとされている。そこで、この点を考
慮して連通孔の大きさを検討した。孔の形状は円
形・楕円・四角その他の多角形とすることが出来
るが、加工上から円形とすることが好ましい。孔
の大きさについては、羽口全長１ｍで、内管内径
は16.4mm、中管内径は27.8mm、外管内径は39.8mm
で、それぞれの管肉厚４mmからなる同芯３重管を
用い、内管と中管とのガス圧力は、内環状流路の
ガス圧より内管圧力が２〜３Kg／cm2程高くなるよ
うに制御して種々検討した結果を第２図に示す。
図面より明らかなように、連通孔の径は0.3mm以
上で、その効果は大きい。そこで連通孔の径は
0.3mm以上とした。また連通孔の径が大きくなる
と内管の流速が低下することおよび羽口自体の高
温強度が低下することから３mm位までが好まし
い。 What must be considered here is the shape, size, and distribution of the communication holes provided in the inner tube. The particle size of the flux currently used is −
It is said that it is good to have 250 meshes that account for 50% or more of the total amount. Therefore, we considered the size of the communication hole with this point in mind. Although the shape of the hole can be circular, oval, square, or other polygonal shape, it is preferably circular from the viewpoint of processing. Regarding the hole size, the total length of the tuyere is 1m, the inner diameter of the inner tube is 16.4mm, the inner diameter of the middle tube is 27.8mm, and the inner diameter of the outer tube is 39.8mm.
Using concentric triple tubes each with a wall thickness of 4 mm, the gas pressure in the inner tube and the middle tube is about 2 to 3 kg/cm 2 higher than the gas pressure in the inner annular flow path. Figure 2 shows the results of various studies conducted under such control.
As is clear from the drawing, the diameter of the communicating hole is 0.3 mm or more, and its effect is significant. Therefore, the diameter of the communicating hole is
It was set to be 0.3 mm or more. Further, as the diameter of the communicating hole becomes larger, the flow velocity in the inner tube decreases and the high temperature strength of the tuyere itself decreases, so it is preferably up to about 3 mm.
次に上記と同じ羽口を用い孔面積率について検
討した。ここで孔面積率とは−内管壁の面積に占
める孔の面積の和−を言う。その検討の結果を第
３図に示す。図面からは、孔面積率0.5％でその
効果が大きいことが判明したので、孔面積率は
0.5％以上が良いことにした。しかし、孔面積率
を大きく採つて多数の連通孔を設けると、羽口自
体の高温強度が低下するので、孔面積率の上限は
2.0％程度とする方が好ましく、また小孔は１部
に集中することなく羽口内管全体に平均的に設け
るようにする。 Next, the pore area ratio was examined using the same tuyere as above. Here, the pore area ratio refers to the sum of the areas of the pores in the area of the inner tube wall. The results of the study are shown in Figure 3. From the drawing, it was found that the effect was large at a pore area ratio of 0.5%, so the pore area ratio was
I decided that 0.5% or more is good. However, if the pore area ratio is increased and a large number of communicating holes are provided, the high-temperature strength of the tuyere itself decreases, so the upper limit of the pore area ratio is
It is preferable to set it to about 2.0%, and the small holes should be provided evenly throughout the tuyere inner tube without being concentrated in one part.
次に、実施例について説明する。下記サイズの
同芯３重管羽口を85トン上底吹き転炉に設置して
吹錬した時の操業条件を以下に記載する。 Next, examples will be described. The operating conditions when a concentric triple tube tuyere of the following size was installed in an 85-ton top-bottom blowing converter for blowing are described below.
内管径…内径16.4mm
中管径…内径27.8mm
外管径…内径39.8mm
管肉厚各４mm、使用羽口数７本
内管のキヤリヤガスは酸素で流量は80Nm3／
min、吹込みフラツクスは生石灰の微粉末で粒度
は250mesh under50％のものを使用し、吹込み流
量を150Kg／min〜300Kg／minまで変化させて2.5
トン吹込んだ。内管壁に設けた連通孔の形状は円
形で、孔直径は１mmとし内管壁に等間隔に設け
た。またその面積率は1.0％であつた。Inner tube diameter...Inner diameter 16.4mm Middle tube diameter...Inner diameter 27.8mm Outer tube diameter...Inner diameter 39.8mm Pipe wall thickness 4mm each, number of tuyeres used: 7 The carrier gas in the inner tube is oxygen and the flow rate is 80Nm 3 /
min, the blown flux used was quicklime fine powder with a particle size of 250 mesh under 50%, and the blown flux was varied from 150 Kg/min to 300 Kg/min.
I blew a ton. The communicating holes provided in the inner tube wall were circular in shape, with a diameter of 1 mm, and were provided at equal intervals on the inner tube wall. The area ratio was 1.0%.
内管と中管の間隙の内環状流路には酸素ガスを
流した。その酸素ガスの流量は内管中心流路との
圧力差△Ｐが１〜５Kg／cm2程度になるように圧力
制御弁を用いて制御した。中管と外管との間隙で
ある外環状流路に流す冷却ガスはプロパンガスと
し、流量は5.0Nm3／minとした。 Oxygen gas was flowed through the inner annular flow path in the gap between the inner tube and the middle tube. The flow rate of the oxygen gas was controlled using a pressure control valve so that the pressure difference ΔP with the center flow path of the inner tube was approximately 1 to 5 kg/cm 2 . The cooling gas flowing into the outer annular channel, which is the gap between the inner tube and the outer tube, was propane gas, and the flow rate was 5.0 Nm 3 /min.
第４図に上記の同芯３重管羽口によるフラツク
ス吹込み流速と内管圧力との関係をグラフで示し
た。また比較例として、従来の同芯２重管羽口に
よる場合の結果も併わせて図示した。第４図で明
らかなように、一方の本発明実施例の３重管羽口
では、フラツクス流量が増加しても内管圧の上昇
は抑制されていることがわかる。しかし、他方の
従来の２重管羽口の操業では、フラツクス吹込み
流量200Kg／min以上は内管圧が上昇し危険であ
るので操業を継続することが出来なかつた。本発
明の３重管構造の羽口を使用する上記実施例では
300Kg／minまで可能となつた。 FIG. 4 is a graph showing the relationship between the flow rate of flux blown through the above-mentioned concentric triple tube tuyere and the inner tube pressure. As a comparative example, the results obtained using a conventional concentric double tube tuyere are also shown. As is clear from FIG. 4, it can be seen that in the triple tube tuyere of the embodiment of the present invention, the increase in the internal tube pressure is suppressed even if the flux flow rate increases. However, in the operation of the conventional double-tube tuyere, the operation could not be continued if the flux injection flow rate exceeded 200 kg/min because the internal pipe pressure would rise and it would be dangerous. In the above embodiment using the triple tube structure tuyere of the present invention,
Now possible up to 300Kg/min.
このことによつて、従来フラツクス吹込み量は
吹錬時間中に最高でも2.5トンであつたものが4.0
トンまで可能となつた。 As a result, the maximum amount of flux injected during the blowing time was 4.0 tons, which was previously 2.5 tons.
It has become possible to produce up to tons.
これにより炉上から塊状生石灰を投入すること
なく、フラツクス吹込みのみで吹錬することが可
能となつた。その結果、スラグの滓化が促進され
同量生石灰使用時における脱Ｐ能、脱Ｓ能が従来
に比べ向上し、焼石灰原単位を低減させることが
出来る。 This made it possible to carry out blowing only by injecting flux without introducing lump quicklime from above the furnace. As a result, the slag formation of slag is promoted, and when the same amount of quicklime is used, the P removal ability and S removal ability are improved compared to the conventional method, and the unit consumption of burnt lime can be reduced.
また、内管圧の上昇によつて操業が阻害される
ことも全くなくなつた。 Additionally, operations are no longer hindered by increases in internal pipe pressure.
第１図は３重管構造羽口の概略図、第２図は内
管壁の連通孔の径と内管圧力との関係を示すグラ
フ、第３図は内管壁の孔面積率と内管圧力との関
係を示すグラフ、第４図はフラツクス吹込み流量
と内管圧との関係を示すグラフである。
１……内管、２……中管、３……外管、４……
精錬ガスとフラツクス、５……精錬ガス、６……
冷却ガス。
Figure 1 is a schematic diagram of a triple-pipe structure tuyere, Figure 2 is a graph showing the relationship between the diameter of the communicating hole in the inner tube wall and the inner tube pressure, and Figure 3 is a graph showing the relationship between the pore area ratio of the inner tube wall and the inner tube pressure. FIG. 4 is a graph showing the relationship between flux blowing flow rate and internal pipe pressure. 1... Inner tube, 2... Middle tube, 3... Outer tube, 4...
Refined gas and flux, 5... Refined gas, 6...
cooling gas.
Claims (1)
精錬ガスと共に粉粒体物質を吹込む羽口の構造
を、同芯３重管構造の内管・中管および外管で構
成し、上記内管には中間との間に多数の連通孔を
全面的に設け精錬ガスをキヤリヤガスとして粉粒
体物質を溶融金属浴内に吹込み、内管と中管との
間隙には上記内管内の圧力よりも高圧の精錬ガス
を流し、中管と外管との間隙には冷却ガスを流す
ことが可能な同芯３重管構造にしたことを特徴と
する溶融金属精錬容器用羽口。1 The structure of the tuyere, which blows the refining gas and granular material from the center flow path while flowing the cooling gas into the outer ring flow path, is composed of an inner pipe, a middle pipe, and an outer pipe with a concentric triple pipe structure, and the above-mentioned A large number of communication holes are provided throughout the inner tube between the intermediate tube and the refining gas as a carrier gas to blow the granular material into the molten metal bath. A tuyere for a molten metal refining vessel characterized by having a concentric triple-pipe structure that allows refining gas at a higher pressure than the pressure to flow and cooling gas to flow in the gap between the inner pipe and the outer pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60483A JPS59126711A (en) | 1983-01-06 | 1983-01-06 | Tuyere for molten metal refining vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60483A JPS59126711A (en) | 1983-01-06 | 1983-01-06 | Tuyere for molten metal refining vessel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59126711A JPS59126711A (en) | 1984-07-21 |
| JPH032205B2 true JPH032205B2 (en) | 1991-01-14 |
Family
ID=11478331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60483A Granted JPS59126711A (en) | 1983-01-06 | 1983-01-06 | Tuyere for molten metal refining vessel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59126711A (en) |
-
1983
- 1983-01-06 JP JP60483A patent/JPS59126711A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59126711A (en) | 1984-07-21 |
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