JPS6144922B2 - - Google Patents
Info
- Publication number
- JPS6144922B2 JPS6144922B2 JP54072528A JP7252879A JPS6144922B2 JP S6144922 B2 JPS6144922 B2 JP S6144922B2 JP 54072528 A JP54072528 A JP 54072528A JP 7252879 A JP7252879 A JP 7252879A JP S6144922 B2 JPS6144922 B2 JP S6144922B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- pipe
- refining
- tuyere
- refining gas
- 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
- 238000007670 refining Methods 0.000 claims description 35
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 229910000677 High-carbon steel Inorganic materials 0.000 description 7
- 238000009628 steelmaking Methods 0.000 description 7
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 239000002893 slag Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/48—Bottoms or tuyéres of converters
Description
【発明の詳細な説明】
本発明は、製鋼炉とくに精錬用ガスの全量もし
くは一部を製鋼炉内溶湯々面下から吹込む製鋼炉
において、羽口１本当りの最少、最大吹込みガス
量を広範囲に可変とすることができる精錬用ガス
吹込み羽口に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a steelmaking furnace in which all or part of the refining gas is injected from below the surface of the molten metal in the steelmaking furnace. This invention relates to a refining gas injection tuyere that can be varied over a wide range.
一般に冶金上スラグーメタル反応を促進させる
ためには鋼浴の撹拌がきわめて重要であることは
例えばＱ―BOP法等にみられるように周知の事
柄であり、このために吹込みガス量を多くして撹
拌を強大にすることはきわめて有効な手段とされ
ている。 In general, it is well known that stirring of the steel bath is extremely important in order to promote the metallurgical slag metal reaction, as seen in the Q-BOP method, for example, and for this reason, the amount of blown gas is increased. Increasing the intensity of stirring is considered to be an extremely effective means.
即ち、撹拌が強い場合、酸素によつて生成した
FeOが鋼浴の〔Ｃ〕でただちに還元されてスラグ
中のFeOが少なくなり歩留が期待できるのであ
る。 That is, if the stirring is strong, the
FeO is immediately reduced by [C] in the steel bath, reducing the amount of FeO in the slag and increasing the yield.
さらに低炭素鋼を溶製する場合には鋼中〔Ｃ〕
がきわめて低いので撹拌が強くても滓化を起すこ
とができる適正なFeOを確保することは容易であ
る。しかしながら高炭素鋼をキヤツチカーボン法
で溶製する場合にはFeOを還元する鋼中〔Ｃ〕が
十分に存在するので鋼浴撹拌が過大である場合に
はスラグを滓化させ得る適正FeOの確保はきわめ
て困難となり、スラグ―メタル反応とくに脱Ｐ反
応の進行は期待できなくなる。したがつて、この
対策としては吹込みガス量を減じ鋼浴の撹拌を弱
くして、FeOが〔Ｃ〕で還元されるのを抑制し、
適正FeOを確保することが必要である。 Furthermore, when producing low carbon steel, the steel medium [C]
Since the amount of FeO is extremely low, it is easy to secure an appropriate amount of FeO that can cause slag formation even with strong stirring. However, when high carbon steel is melted by the catch carbon method, there is sufficient [C] in the steel to reduce FeO, so if the steel bath is stirred excessively, the appropriate amount of FeO to reduce the slag to slag can be reduced. It will be extremely difficult to secure this, and the progress of the slag-metal reaction, especially the deP reaction, will no longer be expected. Therefore, as a countermeasure, reduce the amount of blown gas and weaken the stirring of the steel bath to suppress the reduction of FeO with [C].
It is necessary to ensure appropriate FeO.
さて、上述したように低炭素鋼を溶製する場合
羽口１本当りの吹込みガス量を過大とすると、い
わゆるスピツチングあるいはスロツピング現象が
起り、鋼の歩留低下、炉ライニングの損傷等が避
けられず一方低炭素鋼溶製炉を用いて高炭素鋼を
溶製しようとしても溶湯が羽口に侵入することを
阻止するための最低吹込みガス量以下に吹込みガ
ス量を絞り込むことが出来ないことから、同一製
鋼炉、同一羽口編成の下では最少・最大可変ガス
量には限界があり、精錬ガスの一部を溶湯下から
吹込む製鋼炉を用いて低炭素鋼、高炭素鋼の最適
溶製条件の同時確保は困難であつた。また、精錬
用ガスの全量を溶湯下から吹込む製鋼法（例えば
Ｑ―BOP法）においては前述の理由から、該精
錬用ガスを飛躍的に増大させることが困難であ
る。 Now, as mentioned above, when melting low carbon steel, if the amount of gas blown into each tuyere is excessive, the so-called spitting or slopping phenomenon will occur, reducing the steel yield and damaging the furnace lining. On the other hand, even if one tries to melt high carbon steel using a low carbon steel melting furnace, the amount of gas blown cannot be reduced to the minimum amount required to prevent the molten metal from entering the tuyere. Therefore, there is a limit to the minimum and maximum variable gas amount in the same steelmaking furnace and with the same tuyere configuration, and low carbon steel and high carbon steel It was difficult to simultaneously ensure the optimum melting conditions for both. Further, in a steel manufacturing method (for example, the Q-BOP method) in which the entire amount of refining gas is blown from below the molten metal, it is difficult to dramatically increase the amount of refining gas for the reasons described above.
本発明は、上述した事態に鑑みてなされたもの
でその特徴とするところは、保護ガス用外管と、
内管としての精錬用ガス流通管体とからなる二重
管方式の精錬用ガス吹込み羽口において、前記精
錬用ガス流通管体内に、該管体軸方向の適宜範囲
に亘り、管断面方向に伸長し且つ管中心軸に対し
て捻転せしめた気体案内片を設けたことを特徴と
する精錬用ガス吹込み羽口にあり、小数、同一サ
イズ羽口で、広範囲なガス流量可変を可能とし、
効果的なスラグ―メタル反応を行なわせて低炭素
鋼から高炭素鋼まで同一炉で溶製可能とする精錬
用ガス吹込み羽口を提供するにある。 The present invention was made in view of the above-mentioned situation, and its features include an outer tube for protective gas,
In a double-pipe type refining gas blowing tuyere consisting of a refining gas distribution pipe as an inner pipe, the refining gas blowing tuyere is provided within the refining gas distribution pipe within an appropriate range in the axial direction of the pipe in the cross-sectional direction of the pipe. The refining gas blowing tuyere is characterized by having a gas guide piece that extends to the center and is twisted with respect to the central axis of the pipe. ,
The present invention provides a refining gas injection tuyere which allows an effective slag-metal reaction to be performed and melts from low carbon steel to high carbon steel in the same furnace.
本発明者等は本発明の完成に先立つて種々研究
を重ねた結果、保護ガス用外管と、内管としての
精錬用ガス流通管体とからなる二重管方式の精錬
用ガス吹込み羽口において、前記精錬用ガス流通
管体内に羽口中心軸に対して捻転せしめた気体案
内片（以下単にフインと称する）を設け、羽口内
管を複数個のジエツトコアに分割することで、ガ
スジエツトのエネルギを分散させ、スピツテイン
グ、スロツピング等の操業上の問題点を生じさせ
ることなしに最大吹込み可能ガス量を大幅に増大
させ得ることが出来る、つまり吹込ガス量の最
少・最大可変範囲を広くとれることから、前述の
問題点即ち同一製鋼炉、同一羽口編成での低炭素
鋼、高炭素鋼の適正溶製条件の同時確保が可能と
なり、溶湯面下から精錬用ガスを吹込む製鋼炉に
おいて従来法にみられない優れた精錬特性を知見
し得たのである。 As a result of various studies conducted prior to the completion of the present invention, the inventors of the present invention have discovered that a refining gas blowing vane with a double pipe system consisting of an outer pipe for protective gas and a refining gas distribution pipe as an inner pipe has been developed. At the refining gas distribution pipe, a gas guide piece (hereinafter simply referred to as a fin) twisted about the central axis of the tuyere is provided in the refining gas distribution pipe, and the inner pipe of the tuyere is divided into a plurality of jet cores, thereby controlling the flow of the gas jet. By dispersing energy, the maximum amount of gas that can be blown can be greatly increased without causing operational problems such as spitting and slopping, which means that the minimum and maximum amount of gas that can be blown can be varied over a wide range. Therefore, it is possible to solve the problem mentioned above, that is, to simultaneously ensure appropriate melting conditions for low carbon steel and high carbon steel in the same steelmaking furnace and the same tuyere configuration, and in a steelmaking furnace where refining gas is injected from below the surface of the molten metal. They discovered excellent refining properties not found in conventional methods.
以下、本発明の一実施例を図面にもとづいて述
べる。 An embodiment of the present invention will be described below based on the drawings.
第１図は、精錬用ガスの底吹き型式の製鋼炉断
面を示し、１は炉体、２は炉底部に設けた二重管
羽口、３は例えばO2のような精錬ガス吹込み
系、４は例えばプロパンのような炭化水素系の保
護ガス吹込み系である。 Figure 1 shows a cross-section of a bottom-blown type steelmaking furnace for refining gas, where 1 is the furnace body, 2 is a double-tube tuyere provided at the bottom of the furnace, and 3 is a refining gas injection system such as O 2 . , 4 is a hydrocarbon-based protective gas injection system such as propane.
第２図は第１図の炉底羽口部を示す一部切欠き
拡大断面図であり、１ａは炉底部耐火物、２ａは
羽口内管、２ｂは羽口外管、５は精錬用ガス噴出
流で、５ａはガスジエツトコアを示す。 FIG. 2 is an enlarged partially cutaway sectional view showing the bottom tuyere of FIG. 1, where 1a is the bottom refractory, 2a is the inner tube of the tuyere, 2b is the outer tube of the tuyere, and 5 is the refining gas jet. 5a indicates the gas jet core.
第３図は、本発明の二重管方式の内管もしくは
単管の管中心軸にに沿つた方向の断面図で、６は
フインで精錬用ガス流通管体２ａ内の羽口先端よ
り適宜範囲内にわたり管断面方向に伸張し、且つ
管中心軸に対し適宜角度で捻転させて設けられ、
且つ先端は前記精錬用ガス流通管２ａの先端部に
臨ませて設けられ後端はフイン固定棒７を介して
固定用フランジ８に一体的に取付けられている。 FIG. 3 is a cross-sectional view taken along the central axis of the inner tube or single tube of the double-pipe system of the present invention, and 6 is a fin that is properly inserted from the tip of the tuyere in the refining gas distribution pipe body 2a. Extending in the cross-sectional direction of the pipe within the range, and twisted at an appropriate angle with respect to the central axis of the pipe,
The tip is provided facing the tip of the refining gas distribution pipe 2a, and the rear end is integrally attached to a fixing flange 8 via a fin fixing rod 7.
第４図は本発明の羽口先端部分の斜視図であ
り、矢印は、フイン６の捻転した角度に沿つたガ
スジエツトの分散噴出方向を例示したものであ
る。 FIG. 4 is a perspective view of the tip of the tuyere of the present invention, and the arrows illustrate the direction of dispersion and ejection of the gas jet along the twisted angle of the fins 6.
第５図は、本発明の他の実施例図でフインの設
置態様を示す。第５図ａは、直線２分割型、第５
図ｂは中央部に設けた直状精錬用ガス噴射筒９の
外周にフイン６を放射状に植設した直状吹出し部
を包囲してなる５分割型、第５図ｃはフイン一側
端を精錬用ガス流通管２ａ内に固着し他端を中央
部に伸張させた４分割型、第５図ｄは、第４図の
型式の変化型でフイン６に弧を形成させて設けた
場合である。 FIG. 5 is another embodiment of the present invention, showing how the fins are installed. Figure 5a shows a linear two-part type,
Figure b shows a five-divided type in which a straight blow-off part is formed by radially planting fins 6 on the outer periphery of a straight refining gas injection pipe 9 provided in the center, and Figure 5 c shows one side end of the fins. The 4-split type fixed in the refining gas distribution pipe 2a and with the other end extending toward the center, FIG. 5d is a variation of the type shown in FIG. be.
次に本発明を70TON上吹転炉の炉底部に装着し
た場合の実施例について述べる。 Next, an example will be described in which the present invention is installed at the bottom of a 70 TON top-blowing converter.
羽口は18〓（内管径）×３本、フインのノズル
軸芯に対する捻転角度は20度、フイン材質は銅を
用いた。吹込みガスはO2で、吹込みガス流量は
500〜2000Nm3／Hrに設定した。 The tuyeres were 18〓 (inner pipe diameter) x 3, the twist angle of the fins relative to the nozzle axis was 20 degrees, and the fin material was copper. The insufflation gas is O2 , and the insufflation gas flow rate is
It was set at 500 to 2000Nm 3 /Hr.
上記条件で高炭素鋼（0.4〜0.8％Ｃ）をQ2，
500Nm3／Hrで吹込み溶製を完了することができ
た。 Under the above conditions, high carbon steel (0.4~0.8%C) is Q 2 ,
Blow melting could be completed at 500Nm 3 /Hr.
なお0.1％Ｃ以下の低炭素鋼の場合O2，2000N
m3／Hrで吹込み溶製したがスピツテイグ、スロ
ツピングは極度に解消することができ本発明の効
果を確認できた。 For low carbon steel with 0.1%C or less, O 2 , 2000N
Although blow melting was carried out at m 3 /Hr, spitteig and sloping were extremely eliminated, confirming the effect of the present invention.
なおフイン６は精錬用ガスで冷却されているこ
とから、精錬用ガス流通管体２ａより先行して溶
損することはなかつた。またフイン６の管中心軸
に対しての捻転角度の付与範囲は５〜30度の範囲
が好ましく、付与角度が５度未満の場合はガス・
ジエツトの分散が十分でなく、また30度を超える
と羽口近傍耐火物の溶損が著じるしくなるほか、
捻転したフインによる精錬用ガスの圧損が大きく
なることから好ましくない。 Note that since the fins 6 were cooled by the refining gas, they were not melted and damaged before the refining gas distribution pipe body 2a. In addition, the range of the twisting angle of the fins 6 relative to the pipe center axis is preferably in the range of 5 to 30 degrees, and if the twist angle is less than 5 degrees, the gas
Jet dispersion is not sufficient, and if the temperature exceeds 30 degrees, the refractory near the tuyere will be severely eroded, and
This is not preferable because the pressure loss of the refining gas due to the twisted fins increases.
本発明は上述した如く構成し且つ用いることに
より、広範囲なガス流量の選択が容易となること
から精錬用ガスの全量もしくは一部を溶湯面下か
ら吹込む製鋼法においては、低炭素鋼から高炭素
鋼まで容易に溶製することが出来るとともに、精
錬時間の短縮あるいは精錬用ガスの吹込み量を一
定とする場合には羽口設置本数の縮減が可能とな
るなど品質、生産性、経済性ならびに設備保全面
に寄与する効果がきわめて大きい。 By configuring and using the present invention as described above, it becomes easy to select a gas flow rate from a wide range. Therefore, in a steel manufacturing method in which all or part of the refining gas is injected from below the surface of the molten metal, it is possible to select from low carbon steel to high carbon steel. In addition to being able to easily melt up to carbon steel, it is also possible to shorten refining time or reduce the number of tuyere installations if the amount of refining gas injected is constant, improving quality, productivity, and economy. It also has an extremely large effect on equipment maintenance.
第１図は精錬用ガスの底吹き型式の製鋼炉断面
図、第２図は第１図の炉底羽口部を示す一部切欠
き拡大断面図、第３図は本発明の一実施例で管軸
方向に沿つた断面図、第４図は第３図のノズル先
端部の斜視図、第５図は本発明の他の実施例でフ
インの設置態様を示す図である。
６：気体案内片（フイン）、７：フイン固定
棒、８：フランジ、９：直状精錬用ガス噴射筒。
Fig. 1 is a cross-sectional view of a bottom-blown steelmaking furnace for refining gas, Fig. 2 is a partially cutaway enlarged cross-sectional view showing the bottom tuyeres of Fig. 1, and Fig. 3 is an embodiment of the present invention. FIG. 4 is a perspective view of the tip of the nozzle shown in FIG. 3, and FIG. 5 is a diagram showing a manner in which the fins are installed in another embodiment of the present invention. 6: gas guide piece (fin), 7: fin fixing rod, 8: flange, 9: straight refining gas injection tube.
Claims (1)
流通管体とからなる二重管方式の精錬用ガス吹込
み羽口において、前記精錬用ガス流通管体内に、
該管体軸方向の適宜範囲に亘り、管断面方向に伸
長し且つ管中心軸に対して捻転せしめた気体案内
片を設けたことを特徴とする精錬用ガス吹込み羽
口。1. In a double-pipe type refining gas injection tuyere consisting of an outer pipe for protective gas and a refining gas distribution pipe as an inner pipe, inside the refining gas distribution pipe,
A refining gas blowing tuyere characterized in that a gas guide piece is provided over an appropriate range in the axial direction of the tube, extending in the cross-sectional direction of the tube and twisted with respect to the central axis of the tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7252879A JPS55164017A (en) | 1979-06-09 | 1979-06-09 | Gas blow-in tuyere for refining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7252879A JPS55164017A (en) | 1979-06-09 | 1979-06-09 | Gas blow-in tuyere for refining |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55164017A JPS55164017A (en) | 1980-12-20 |
| JPS6144922B2 true JPS6144922B2 (en) | 1986-10-06 |
Family
ID=13491918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7252879A Granted JPS55164017A (en) | 1979-06-09 | 1979-06-09 | Gas blow-in tuyere for refining |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55164017A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5966391A (en) * | 1982-10-05 | 1984-04-14 | Hibiya Sogo Setsubi Kk | Reverse osmosis desalination process |
| JPS59179709A (en) * | 1983-03-30 | 1984-10-12 | 川崎製鉄株式会社 | Blowing tuyere for converter |
| JPS6036612A (en) * | 1983-08-06 | 1985-02-25 | Kawasaki Steel Corp | Gas blowing nozzle for refining |
| JPS6445150U (en) * | 1987-12-24 | 1989-03-17 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5141604A (en) * | 1974-08-08 | 1976-04-08 | Maximilianshuette Eisenwerk | |
| JPS5237442A (en) * | 1975-09-20 | 1977-03-23 | Sumitomo Electric Ind Ltd | Light-transmitting fibers |
-
1979
- 1979-06-09 JP JP7252879A patent/JPS55164017A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5141604A (en) * | 1974-08-08 | 1976-04-08 | Maximilianshuette Eisenwerk | |
| JPS5237442A (en) * | 1975-09-20 | 1977-03-23 | Sumitomo Electric Ind Ltd | Light-transmitting fibers |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55164017A (en) | 1980-12-20 |
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