JPS6144923B2 - - Google Patents
Info
- Publication number
- JPS6144923B2 JPS6144923B2 JP54072529A JP7252979A JPS6144923B2 JP S6144923 B2 JPS6144923 B2 JP S6144923B2 JP 54072529 A JP54072529 A JP 54072529A JP 7252979 A JP7252979 A JP 7252979A JP S6144923 B2 JPS6144923 B2 JP S6144923B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- tuyere
- refining
- amount
- steel
- 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 23
- 238000007664 blowing Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 238000002844 melting Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 8
- 238000009628 steelmaking Methods 0.000 description 8
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 6
- 229910000677 High-carbon steel Inorganic materials 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 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
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001681 protective effect Effects 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
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 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
- 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
- 238000005272 metallurgy Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000003466 welding Methods 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きる精錬用ガス吹込
み羽口に関する。Detailed Description of the Invention The present invention aims to reduce the minimum and maximum amount of gas injected per tuyere in a steelmaking furnace, particularly in 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. The present invention relates to a refining gas injection tuyere which can be varied over a wide range.
一般に冶金上にスラブ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が多くして
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 slab metal reactions in metallurgy, as seen in the Q-BOP method, for example, and for this reason, the amount of gas blown is large. 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
溶製條件の同時確保は困難であつた。 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. It was difficult to simultaneously ensure the optimum melting conditions for both.
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、該精錬用ガス飛躍的に増大させることが
困難である。 Furthermore, 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 refining gas for the reasons mentioned 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、複数の小径管からな
る集合管体を管軸に対し適宜角度で捻転せしめて
中空の羽口内管に内挿した精錬用ガス吹込管を設
けたことにあり、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―
メチ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 feature is that a collecting pipe body consisting of a plurality of small diameter pipes is twisted at an appropriate angle with respect to the pipe axis and inserted into a hollow tuyere inner pipe. By installing a refining gas blowing pipe, it is possible to vary the gas flow rate over a wide range with a small number of tuyeres of the same size, making it possible to effectively control slag.
The present invention provides a refining gas injection tuyere which allows a methyl reaction to be carried out 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、精錬用ガス流通管（羽口内管）体
内に羽口中心軸に対して適宜角度を付した集合管
体を設け、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 present inventors installed a collecting pipe body at an appropriate angle with respect to the central axis of the tuyere inside the refining gas distribution pipe (tube inside the tuyere), and By dividing the oral tube into multiple jet cores, the energy of the gas jet can be dispersed and the maximum amount of gas that can be injected can be greatly increased without causing operational problems such as spitting and slopping. In other words, since the minimum and maximum variable range of the blown gas amount can be widened, it is possible to solve the problem mentioned above, that is, to simultaneously ensure the appropriate melting conditions for low carbon steel and high carbon steel in the same steelmaking furnace and the same tuyere configuration. In a steelmaking furnace in which refining gas is injected from below the surface of the molten metal, excellent refining characteristics not seen in conventional methods were discovered.
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。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。 Figure 1 shows a cross section of a bottom-blown steelmaking furnace for refining gas. 1 is the furnace body, 2 is a double tube tuyere provided at the bottom of the furnace, 3 is a refining gas injection system such as O 2 ,
4 is a system for blowing a hydrocarbon-based protective gas such as propane. FIG. 2 is a partially cutaway enlarged cross-sectional view showing the bottom tuyere of FIG.
5 is a refining gas jet flow, and 5a is a gas jet core.
第３図は本発明の精錬用ガス吹込み管の一実施
例では管断面を示す。６は小径管７からなる集合
管体で例えば溶接等の手段を用いて一体的に形成
し、且つ集合管体中心軸に対して適宜角度捻転さ
せて中空の羽口内管２ａに内挿している。なおこ
の集合管体６はいわゆる羽口内管２ａに内挿する
ことなく単管として用いることもできる。 FIG. 3 shows a cross section of a refining gas blowing pipe according to an embodiment of the present invention. Reference numeral 6 denotes a collecting pipe body consisting of small diameter pipes 7, which are integrally formed by means such as welding, twisted at an appropriate angle with respect to the central axis of the collecting pipe body, and inserted into the hollow tuyere inner pipe 2a. . Note that this collecting pipe body 6 can also be used as a single pipe without being inserted into the so-called tuyere inner pipe 2a.
次に本発明を70TON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 converter.
ノズルは18φ（集合管外径）×３本、集合管体
のノズル軸芯に対する捻転角度は20度、集合管体
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 nozzles were 18φ (collecting pipe outer diameter) x 3, the twist angle of the collecting pipe body with respect to the nozzle axis was 20 degrees, and the material of the collecting pipe body was copper. The blown gas was O 2 and the blown gas flow rate was set at 500 to 2000 Nm 3 /Hr.
上記条件で高炭素鋼（0.4〜0.8％Ｃ）をO2、
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) was heated to O 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ング、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。なお集合管体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２
ａより先行して溶損することはなかつた。また集
合管体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、捻転した集合管体による精
錬用ガスの圧損が大きくなることから好ましくな
い。 For low carbon steel with 0.1%C or less, O 2 , 2000N
Although blow melting was carried out at m 3 /Hr, spitting and slopping were extremely eliminated, confirming the effects of the present invention. Note that since the collecting pipe body 6 is cooled by the refining gas, the refining gas distribution pipe body 2
There was no melting loss prior to a. In addition, the range of the twist angle relative to the central axis of the tube of the collecting pipe body 6 is preferably in the range of 5 to 30 degrees; if the twist angle is less than 5 degrees, the gas jet will not be sufficiently dispersed; Exceeding this is not preferable because not only will the melting loss of the refractories near the tuyere become significant, but also the pressure loss of the refining gas due to the twisted collecting pipe will become large.
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 Not only can steel be easily melted, but it also improves quality, productivity, economy, and reduces the number of tuyere installations if the refining time is shortened or the amount of refining gas blown is kept constant. The effect of contributing to equipment maintenance is extremely large.
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断
面図である。
１……炉体、２……二重管羽口、３……精錬ガ
ス吹込系、４……保護ガス吹込系、５……精錬用
ガス噴出流、６……集合管体、７……小径管。
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. This is a cross-sectional view of the tube. DESCRIPTION OF SYMBOLS 1...furnace body, 2...double tube tuyere, 3...refining gas injection system, 4...protective gas injection system, 5...refining gas jet flow, 6...collecting pipe body, 7... Small diameter pipe.
Claims (1)
適宜角度で捻転せしめて、中空の羽口内管に内挿
してなることを特徴とする精錬用ガス吹込み管。1. A gas blowing pipe for refining, characterized in that a collecting pipe body consisting of a plurality of small diameter pipes is twisted at an appropriate angle with respect to the pipe axis and inserted into a hollow tuyere inner pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7252979A JPS55164018A (en) | 1979-06-09 | 1979-06-09 | Gas blow-in pipe for refining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7252979A JPS55164018A (en) | 1979-06-09 | 1979-06-09 | Gas blow-in pipe for refining |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55164018A JPS55164018A (en) | 1980-12-20 |
| JPS6144923B2 true JPS6144923B2 (en) | 1986-10-06 |
Family
ID=13491951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7252979A Granted JPS55164018A (en) | 1979-06-09 | 1979-06-09 | Gas blow-in pipe for refining |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55164018A (en) |
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 JP7252979A patent/JPS55164018A/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 |
|---|---|
| JPS55164018A (en) | 1980-12-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0240998B1 (en) | Melting furnace and method for melting metal | |
| SU1306482A3 (en) | Method for steel melting in converter | |
| EP1721017B1 (en) | Method for producing low carbon steel | |
| JP4830825B2 (en) | Refining method in converter type refining furnace | |
| JPS6144922B2 (en) | ||
| US4302244A (en) | Steel conversion method | |
| EP0816517B1 (en) | Preventing skull accumulation on a steelmaking lance | |
| JPS6144923B2 (en) | ||
| JPS61139616A (en) | Method for removing accretion on throat of converter | |
| JP5298543B2 (en) | Converter operation method | |
| JP2011202236A (en) | Top-blowing lance for converter, and method for operating converter | |
| JP3655659B2 (en) | Blow acid sending method on converter with good yield | |
| JP2877026B2 (en) | How to protect the refining tuyere | |
| CN205205168U (en) | A low temperature hangs down ferrosilicon water oxygen rifle shower nozzle for 90 tons of converters are smelted | |
| JP5412756B2 (en) | Converter operation method | |
| JPH0355538B2 (en) | ||
| JP2010047830A (en) | Method for operating converter | |
| JPH07216430A (en) | Molten steel production method and top blowing lance for molten metal refining | |
| JPH08253805A (en) | Method for refining stainless steel using decarburizing slag having high productivity | |
| JPH065406Y2 (en) | Converter blowing lance | |
| JPH10219329A (en) | Lance and method for removing stuck metal in furnace using the lance | |
| JPH06240329A (en) | Top blowing oxygen lance for refining molten metal and method for refining molten metal | |
| JPS5970709A (en) | Spiral conduit for gas blowing tuyere for refining | |
| JP2000256724A (en) | Converter steelmaking method excellent in stability of operation | |
| JPH08157928A (en) | Top-blowing lance for converter with less dust generated |