JPS6140012B2 - - Google Patents
Info
- Publication number
- JPS6140012B2 JPS6140012B2 JP1375881A JP1375881A JPS6140012B2 JP S6140012 B2 JPS6140012 B2 JP S6140012B2 JP 1375881 A JP1375881 A JP 1375881A JP 1375881 A JP1375881 A JP 1375881A JP S6140012 B2 JPS6140012 B2 JP S6140012B2
- Authority
- JP
- Japan
- Prior art keywords
- lance
- tuyere
- tuyeres
- slag
- 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
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
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
Description
【発明の詳細な説明】
本発明は上底吹転炉の改良に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a top-bottom blowing converter.
本発明の目的は、上底吹転炉法における良好な
ガス・メタル反応性、スラグ・メタル反応性、操
業中の振動防止、スプラツシユ防止、サンプリン
グの均一性、サブランスの測定中の保護、その他
メンテナンス等をを考慮して、最適の条件を具備
する上底吹転炉を提供しようとするものである。 The objectives of the present invention are to achieve good gas-metal reactivity, slag-metal reactivity in the top-bottom blowing converter method, vibration prevention during operation, splash prevention, uniformity of sampling, protection during sublance measurement, and other maintenance. In consideration of the above, the present invention aims to provide a top-bottom blowing converter having optimal conditions.
本発明者は、ガス・メタル反応性、スラグ・メ
タル反応性、振動、スプラツシユ量におよぼす羽
口配置と羽口本数について種々検討した。その結
果を第１図ａ〜ｄに示す。第１図のａはガス・メ
タル反応性（底吹比率10％，ランス高さ4900
mm）、ｂはスラグ・メタル反応性（底吹比率10
％，ランス高さ4900mm）、ｃは軸方向振動（底吹
比率10％，ランス高さ2800mm）、ｄはスプラツシ
ユ量（ランス角度：〇印は０度と90度，△印は45
度；ランス高さ4900mm）を示す図である。なお第
１図ｅは羽口配置と本数の説明図で、図中LDは
上吹転炉（径7380mm）、１〜８の数字は羽口本
数、Ｑ―BOPは底吹転炉である。 The present inventor conducted various studies on the tuyere arrangement and the number of tuyere on the effects on gas/metal reactivity, slag/metal reactivity, vibration, and amount of splash. The results are shown in Figures 1a-d. In Figure 1, a indicates gas/metal reactivity (bottom blowing ratio 10%, lance height 4900
mm), b is the slag/metal reactivity (bottom blow ratio 10
%, lance height 4900 mm), c is axial vibration (bottom blow ratio 10%, lance height 2800 mm), d is splash amount (lance angle: 〇 marks are 0 degrees and 90 degrees, △ marks are 45
degree; lance height 4900 mm). FIG. 1e is an explanatory diagram of the tuyere arrangement and number. In the figure, LD is a top-blowing converter (diameter 7380 mm), numbers 1 to 8 are the number of tuyeres, and Q-BOP is a bottom-blowing converter.
第１図から明らかな如く、ガス・メタルおよび
スラグ・メタル反応性は羽口本数が４以上で良
好、炉体振動は羽口本数４以上で低位に飽村、ス
プラツシユは羽口本数２以上で上吹転炉以下であ
ることから羽口本数は複数本とするが有利には４
本以上が好ましい。 As is clear from Figure 1, the gas-metal and slag-metal reactivity is good when the number of tuyere is 4 or more, the furnace vibration is low when the number of tuyere is 4 or more, and the splash is good when the number of tuyere is 2 or more. Since it is smaller than a top-blown converter, the number of tuyeres is multiple, but four is advantageous.
A book or more is preferable.
しかして羽口を炉底に配置するにあつては、冶
金的反応を促進しかつその効率を高めるため、上
部ランスからの酸素噴射範囲内とすることがより
好ましく、かかる配慮はスロツピング防止の面か
らも有利である。従つて本発明においてはかかる
点を考慮して羽口の配置範囲を上部ランスからの
酸素噴射範囲内に定めた。 Therefore, when placing the tuyere at the bottom of the furnace, it is preferable to place it within the range of oxygen injection from the upper lance in order to promote the metallurgical reaction and increase its efficiency. It is also advantageous. Therefore, in the present invention, taking this point into consideration, the arrangement range of the tuyere is determined within the range of oxygen injection from the upper lance.
さらに本発明の好ましい実施態様においては炉
体振動防止の観点から、転炉のトラニオン軸と平
行な直径線に対して線対称に各２本づつ対をなし
て配置する。かくすることによつて操業に際して
の炉体の振動をより大幅に低減することができ
る。 Furthermore, in a preferred embodiment of the present invention, from the viewpoint of preventing furnace body vibration, two of the converters are arranged in pairs symmetrically with respect to a diameter line parallel to the trunnion axis of the converter. By doing so, the vibration of the furnace body during operation can be further reduced.
また本発明においては、サブランスに対する溶
鋼の偏流衝突を防止してその曲損、折損防止をは
かり安定姿勢によるサンプリングの均一性を確保
するためサブランス降下点を、該降下点に至近な
少くとも２本の羽口に対して等距離となる如く構
成するものである。 In addition, in the present invention, in order to prevent the molten steel from colliding with the sub-lance due to drifting, bending and breaking the sub-lance, and to ensure uniformity of sampling due to a stable posture, the sub-lance is set at at least two drop points close to the drop point. The structure is such that the tuyeres are equidistant from each other.
本発明の好ましい実施例を第２図ａ，ｂにより
説明する。 A preferred embodiment of the invention will be explained with reference to FIGS. 2a and 2b.
図において１は鉄皮（１ａは鉄皮内径を示
す）、２は炉底部レンガであり、３はトラニオン
軸、４は羽口、５はサブランス降下点、６は上吹
ランス８からの酸素噴射範囲すなわち火点範囲、
７は炉心を示す。図から明らかなように羽口４は
６本が、トラニオン軸３と平行な直径線３ａに対
して線対称に各２本毎に対をなして配置され、ま
たサブランス降下点５は、この降下点に対して至
近な２本の羽口４から等距離である。 In the figure, 1 is the steel shell (1a indicates the inner diameter of the steel shell), 2 is the furnace bottom brick, 3 is the trunnion shaft, 4 is the tuyere, 5 is the sublance descent point, and 6 is the oxygen injection from the top blowing lance 8. range or flashpoint range,
7 indicates the reactor core. As is clear from the figure, six tuyeres 4 are arranged in pairs of two tuyeres each symmetrically with respect to the diameter line 3a parallel to the trunnion axis 3, and the sublance descent point 5 is The point is equidistant from the two closest tuyeres 4.
かかる羽口配置をもつ上底吹転炉により操業し
た実施例により、本発明の効果を説明する。 The effects of the present invention will be explained with reference to an example in which a top-bottom blowing converter having such a tuyere arrangement was operated.
実施例
１ 操業条件
溶銑装入量 310〜355ton
スクラツプ量 75〜0ton
溶銑成分 Ｃ ：4.4〜4.8％
Mn：0.35〜0.43％
Si：0.15〜0.60％
Ｐ ：0.100〜0.115％
Ｓ ：0.001〜0.030％
Fe：残
羽口６本からのO2吹込量
４，000〜８，000Nm3/Hr
上吹ランスからのO2吹込量
70，000〜90，000Nm3/Hr
２操業結果
ガス―メタル反応：
第３図ａに、吹止〔Ｃ〕とスラグ中Ｔ・Fe
との関係で示す如く、上吹のみの場合イおよ
びランスによる上吹きと羽口２〜３本による
底吹とを併用した上底吹ロの場合に比し、本
実施例ハの場合、ランス中Ｔ・Feが著しく
低くガス・メタル反応性が良好であつた。Example 1 Operating conditions Hot metal charging amount 310-355 tons Scrap amount 75-0 tons Hot metal components C: 4.4-4.8% Mn: 0.35-0.43% Si: 0.15-0.60% P: 0.100-0.115% S: 0.001-0.030% Fe :Remaining O2 injection amount from 6 tuyeres
4,000-8,000Nm 3 /Hr O2 injection amount from top blow lance
70,000 to 90,000Nm 3 /Hr 2 Operation results Gas-metal reaction: Figure 3 a shows the T/Fe in the blow-off [C] and the slag.
As shown in the relationship, compared to the case of top blowing only (A) and the case of top and bottom blowing that uses a combination of top blowing with a lance and bottom blowing with two or three tuyeres, in the case of C of this embodiment, the lance The medium T/Fe was extremely low and the gas/metal reactivity was good.
スラグ―メタル反応：
第３図ｂに、スラグ中Ｔ・FeとP2O3／Ｐと
の関係で示す如く、上吹きと羽口２本による
上底吹ロの場合に比し、本実施例ハの場合
は、Ｔ・Feが同等レベルでも〔P2O5％／Ｐ
％〕の値が大きくスラグ・メタル反応性が良
好であつた。 Slag-metal reaction: As shown in Figure 3b, the relationship between T and Fe in the slag and P 2 O 3 /P, this method In the case of example C, even if T and Fe are at the same level, [P 2 O 5 %/P
%] was large and the slag-metal reactivity was good.
振動、その他
振動によるトラニオン軸受にかかる軸方向荷
重及び該軸方向に対する直角方向荷重の変動
を測定したところ、羽口２本の場合が60〜
100tonであるのに対して本実施例の場合は20
〜50tonと極めて小さい値に軽減することが
でき、且つスプラツシユ抑制効果も大きく例
えばスプラツシユによる炉口付着地金の除去
頻度は火点範囲６から羽口４―１，４―４，
４―３，４―６を外して配置した場合に対比
して1/2に低減することができた。更にサブ
ランスにより溶鋼温度及び成分を測定したと
ころサブランスを曲損、折損することなく安
定した姿勢でしかも精度良く測定することが
できた。 When we measured the axial load applied to the trunnion bearing due to vibrations and other vibrations, and the variation in the load in the direction perpendicular to the axial direction, we found that in the case of two tuyeres, it was 60~
100 tons, whereas in this example it is 20 tons.
The value can be reduced to an extremely small value of ~50 tons, and the splash suppression effect is also large.
Compared to when 4-3 and 4-6 were removed and placed, the reduction was reduced to 1/2. Furthermore, when we measured the temperature and composition of molten steel using the sublance, we were able to measure the temperature and composition of molten steel in a stable position without bending or breaking the sublance, and with good accuracy.
第１図ａ〜ｄは羽口本数とガス・メタル反応性
（ａ図）、スラグ・メタル反応性（ｂ図）、振動
（ｃ図）、スプラツシユ量（ｄ図）の各々との関係
を示す図、第１図ｅは、炉底羽口配置を示す平面
図、第２図ａは本発明の実施例における炉底羽口
配置を示す平面図、第２図ｂは第２図ａのＡ―Ａ
矢視断面図、第３図ａは前記実施例によるガス・
メタル反応性をスラグ中Ｔ・Fe％と吹止め
〔Ｃ〕％との関係で、LD法単独の場合及び上底吹
法で羽口２本の場合と比較して示すグラフ、第３
図ｂは同実施例によるスラグ・メタル反応性をス
ラグ中のＴ・Fe％と〔P2O5％／Ｐ％〕の関係に
おいて、羽口２〜３本の場合と比較して示すグラ
フである。
図において
１……上底吹転炉の炉底部鉄皮、２……炉底部
レンガ、３……トラニオン軸、４……羽口、５…
…サブランス降下点、６……火点範囲。
Figures 1 a to d show the relationship between the number of tuyeres and gas/metal reactivity (Figure a), slag/metal reactivity (Figure B), vibration (Figure C), and amount of splash (Figure d). Figure 1e is a plan view showing the arrangement of the hearth tuyere, Fig. 2a is a plan view showing the arrangement of the hearth tuyere in the embodiment of the present invention, and Fig. 2b is the A of Fig. 2a. -A
A sectional view taken in the direction of arrows, FIG. 3a shows the gas
Graph showing metal reactivity in relation to T/Fe% in slag and blowstop [C]% in the case of the LD method alone and the case of the top-bottom blowing method with two tuyeres, Part 3
Figure b is a graph showing the slag-metal reactivity according to the same example in the relationship between T/Fe% in the slag and [P 2 O 5 %/P%] in comparison with the case of 2 to 3 tuyeres. be. In the figure: 1... bottom shell of a top-bottom blowing converter, 2... bottom brick, 3... trunnion shaft, 4... tuyere, 5...
...Sabrance descent point, 6...Flash point range.
Claims (1)
射範囲の炉底に複数の羽口を配置すると共に、サ
ブランス降下点を、該降下点に至近な少くとも２
本の羽口に対して等距離となる如くした上底吹転
炉。1. In a top-bottom blowing converter, a plurality of tuyeres are arranged at the bottom of the furnace in the range of oxygen injection from the upper lance, and the sub-lance drop point is set at at least two points close to the drop point.
A top-bottom blowing converter that is equidistant from the book tuyere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1375881A JPS57131314A (en) | 1981-02-03 | 1981-02-03 | Top and bottom blown converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1375881A JPS57131314A (en) | 1981-02-03 | 1981-02-03 | Top and bottom blown converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57131314A JPS57131314A (en) | 1982-08-14 |
| JPS6140012B2 true JPS6140012B2 (en) | 1986-09-06 |
Family
ID=11842143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1375881A Granted JPS57131314A (en) | 1981-02-03 | 1981-02-03 | Top and bottom blown converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57131314A (en) |
-
1981
- 1981-02-03 JP JP1375881A patent/JPS57131314A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57131314A (en) | 1982-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2011702A1 (en) | Method for smelting reduction of ni ore | |
| JPS6140012B2 (en) | ||
| GB2085562A (en) | Oxygen lance for iron refining | |
| US3236630A (en) | Oxygen steelmaking | |
| CA1205290A (en) | Method of increasing the cold material charging capacity in the top-blowing production of steel | |
| EP0061749B1 (en) | A multi-step steelmaking refining method | |
| EP0060305A1 (en) | Method for smelting using top-and bottom-blown converter | |
| JP3531467B2 (en) | Dephosphorization refining method of hot metal in converter | |
| JPS5743918A (en) | Method for preventing spouting in bottom-blown converter jointly using top blow | |
| KR100225249B1 (en) | Remaining slag control method of of slopping control | |
| JPS6140013B2 (en) | ||
| JPS6184311A (en) | Method for heating molten iron by secondary combustion method | |
| US4596600A (en) | Steel-making process in converter | |
| JPS5867815A (en) | Preventing method for vibration in blow refining by converter with bottom blow function | |
| JPS6159365B2 (en) | ||
| JPS6210284B2 (en) | ||
| SU711106A1 (en) | Method of steel production in convertor | |
| JP2760155B2 (en) | Hot metal production method | |
| JPS6151605B2 (en) | ||
| Wondris | Trials With the Top--Bottom--Oxygen Blowing Steelmaking Processes at National Steel Corp | |
| Pehlke | Pneumatic steelmaking | |
| JP2000336418A (en) | Converter blowing method | |
| Nakanishi | Recent Progress of OBM/Q-BOP Steelmaking at Kawasaki Steel Corporation | |
| Arno et al. | Realization of Slag Formation Control Through an Accelerometric Probe at the Steelmaking Plant No. 2 of Italsider Taranto Works | |
| Tohge | Process for the Decarburization of Molten Metal |