JPH01123016A - Blowing method for converter - Google Patents
Blowing method for converterInfo
- Publication number
- JPH01123016A JPH01123016A JP62280639A JP28063987A JPH01123016A JP H01123016 A JPH01123016 A JP H01123016A JP 62280639 A JP62280639 A JP 62280639A JP 28063987 A JP28063987 A JP 28063987A JP H01123016 A JPH01123016 A JP H01123016A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen
- gas
- blowing
- molten steel
- refining
- 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.)
- Pending
Links
- 238000007664 blowing Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 29
- 239000001301 oxygen Substances 0.000 claims abstract description 29
- 239000007789 gas Substances 0.000 claims abstract description 14
- 239000011261 inert gas Substances 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 239000002893 slag Substances 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 abstract description 15
- 239000010959 steel Substances 0.000 abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 13
- 238000007670 refining Methods 0.000 abstract description 7
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000003756 stirring Methods 0.000 abstract description 3
- 230000005587 bubbling Effects 0.000 abstract 3
- 238000005261 decarburization Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/0265—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric the criterion being a learning criterion
Landscapes
- Engineering & Computer Science (AREA)
- Artificial Intelligence (AREA)
- Health & Medical Sciences (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Evolutionary Computation (AREA)
- Medical Informatics (AREA)
- Software Systems (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は転炉吹錬法において、ＣＯガスによる突沸を
防ぎ、スピッティングを防止する方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for preventing bumping caused by CO gas and spitting in a converter blowing method.
［従来技術］
従来、転炉吹錬においては、溶湯の脱炭の最盛期におい
て多量に生成されたＣＯガスにより、溶湯を覆っている
スラグが大きく膨張して所謂スラグフォーミングの状態
となるが、前記脱炭の最盛期を過ぎて酸素の供給量が脱
炭速度を支配する所謂酸素律速の吹錬期から鋼浴中の炭
素含有量が脱炭速度を支配する所謂炭素律速の吹錬期に
移行すると前述のスラグフォーミングの状態は鎮静化の
方向に向う、しかし、この吹錬期にはスラグ中のＦｅＯ
の割合［以下これを単にこれを（Ｆｅｄ）と書く］が増
加し、二の（Ｆｅｄ）が鋼浴の［Ｃ］に還元されて発生
するＣＯガスの突沸現象により溶鋼が飛散される所謂ス
ピッティングを生じて、排ガスフードまたは副原料投入
孔に地金が固着し、これが成長すると転炉の回転または
副原料の投入が不可能となる虞がある。[Prior Art] Conventionally, in converter blowing, the slag covering the molten metal expands greatly due to the large amount of CO gas generated at the peak of decarburization of the molten metal, resulting in a state of so-called slag forming. After the peak of decarburization, the so-called oxygen-controlled blowing period, in which the amount of oxygen supplied controls the decarburization rate, shifts to the so-called carbon-controlled blowing period, in which the carbon content in the steel bath controls the decarburization rate. As the slag foaming progresses, the above-mentioned state of slag foaming tends to subside; however, during this blowing stage, FeO in the slag
The ratio of [hereinafter simply referred to as (Fed)] increases, and the so-called spit where molten steel is scattered due to the bumping phenomenon of CO gas generated when the second (Fed) is reduced to [C] in the steel bath. This causes the metal to stick to the exhaust gas hood or the auxiliary raw material input hole, and if this grows, there is a risk that it will become impossible to rotate the converter or input the auxiliary raw material.
上記のスピッティングの発生は前記炭素律速の吹錬期に
なっても送酸速度が一定であると、鋼浴中のＦｅが酸化
されて（Ｆｅｄ）が増加し、これが鋼浴中の［Ｃ］と突
発的に反応して生じるものと考えられるので、前記吹錬
期に送酸速度を落とすことにより、スピッティングを避
けるようにしていた。The above-mentioned spitting occurs when the oxygen feeding rate remains constant even during the carbon-controlled blowing period, Fe in the steel bath is oxidized and (Fed) increases, which causes [C ] Since it is thought that this occurs due to a sudden reaction, spitting has been avoided by lowering the oxygen supply rate during the blowing period.
［発明が解決しようとする問題点］
しかしながら、送酸速度を落とすことは鋼浴に衝突する
ガスの流量が減少し、鋼浴の攪拌力が低下し、鋼浴の脱
炭その他の反応速度が低下して吹錬時間が長くなる。[Problems to be Solved by the Invention] However, reducing the oxygen supply rate reduces the flow rate of gas that collides with the steel bath, lowers the stirring power of the steel bath, and reduces the rate of decarburization and other reactions in the steel bath. It decreases and the blowing time becomes longer.
この発明はかかる事情に鑑みてなされたものであって、
スピッティング現象を避け、かっ吹錬時間が長くならず
、安定した転炉吹錬法を提供しようとするのもである。This invention was made in view of such circumstances, and
The aim is to provide a stable converter blowing method that avoids the spitting phenomenon and does not require long blowing time.
［問題点を解決するための手段及び作用］この発明の転
炉吹錬法は、酸素ランスから吹き込まれるガスの流量を
一定として、炭素律速の吹錬期に酸素と同時に不活性ガ
スを酸素に対して０．１乃至０．５の割合で酸素ジェッ
トを囲むように吹き込み、（Ｆｅ○）を制御することを
特徴とする。[Means and effects for solving the problem] The converter blowing method of the present invention keeps the flow rate of gas blown from the oxygen lance constant, and converts inert gas into oxygen at the same time as oxygen during the carbon-controlled blowing period. The characteristic is that (Fe○) is controlled by blowing the oxygen around the jet at a ratio of 0.1 to 0.5.
前記炭素吹錬期に入って送酸速度をそのまま一定にして
おくと、溶湯が酸素リッチとなって（Ｆｅｄ）が増加し
、この（Ｆｅｄ）が鋼浴中の［Ｃ］により還元されて生
じるＣＯガスの突沸現象でスピッティング現象が発生す
る。上記のように酸素ランスからのガス流量を略一定に
して不活性ガスを吹き込むことにより、鋼浴の攪拌力を
維持したまま前記スピッティング現象を避けることが出
来る。If the oxygen feeding rate is kept constant after entering the carbon blowing period, the molten metal becomes rich in oxygen and (Fed) increases, and this (Fed) is reduced by [C] in the steel bath. A spitting phenomenon occurs due to the bumping phenomenon of CO gas. As described above, by blowing inert gas while keeping the gas flow rate from the oxygen lance substantially constant, the above-mentioned spitting phenomenon can be avoided while maintaining the stirring power of the steel bath.
［実施例］ 添付の図面により本発明の詳細な説明する。[Example] The invention will be explained in detail with reference to the accompanying drawings.
第１図は本発明の方法に用いる酸素ランスのノズルを示
す図である。この図はノズル先端を下方から見た図で中
央の３つのノズル１１は酸素用で、周囲の８つのノズル
１２は不活性ガス用である。FIG. 1 is a diagram showing the nozzle of an oxygen lance used in the method of the present invention. This figure is a view of the nozzle tip viewed from below, and the three nozzles 11 in the center are for oxygen, and the eight surrounding nozzles 12 are for inert gas.
このノズルの構成はこれに限るものではなく、要は中央
部に酸素用のノズル、周囲に不活性ガス用のノズルが配
置されていることである。この配置にした理由について
次に説明する。The configuration of this nozzle is not limited to this, but the important point is that the nozzle for oxygen is arranged in the center and the nozzle for inert gas is arranged around the nozzle. The reason for this arrangement will be explained next.
従来例においては酸素ランスのノズルは全て酸素用のも
のであり、このノズルで酸素吹錬を行った場合には、酸
素ジェットが湯面に衝突するところ即ち火点の周囲で吹
き上げられた粒鉄が酸素ジェットにより酸化され、これ
が（Ｆｅｄ）を増加させる大きな要因となっていると考
えられる。In the conventional example, all the nozzles of the oxygen lance are for oxygen, and when oxygen blowing is performed with these nozzles, the granulated iron is blown up where the oxygen jet collides with the hot water surface, that is, around the ignition point. is oxidized by the oxygen jet, and this is thought to be a major factor in increasing (Fed).
したがって、前述の通り第１図で周囲に不活性ガスのノ
ズルを配置して前記粒鉄の酸化を妨げ、（Ｆｅｄ）の増
加を防止している。Therefore, as described above, as shown in FIG. 1, inert gas nozzles are arranged around the iron particles to prevent the oxidation of the iron particles and to prevent an increase in (Fed).
ここで不活性ガスとしてＡｒまたはＣｏ２が用いられる
。スピッティングを防止するための不活性ガスと酸素と
の流量比は前述の通り、０，１乃至０．５であるが、０
．１未満では（Ｆｅｄ）の増加を防ぐことは困難で、０
．５を越えるときは脱炭効率が低下し、精錬時間が従来
例よりも長くなる虞がある。Here, Ar or Co2 is used as the inert gas. As mentioned above, the flow rate ratio of inert gas and oxygen to prevent spitting is 0.1 to 0.5, but 0.
．． If it is less than 1, it is difficult to prevent an increase in (Fed), and 0
．． When it exceeds 5, the decarburization efficiency may decrease and the refining time may become longer than in the conventional example.
前述のようなスピッティングによる操業上のトラブルが
従来は月に２回乃至３回発生していたが、本発明を実施
した結果、これが皆無となった。Conventionally, operational troubles due to spitting as described above occurred two to three times a month, but as a result of implementing the present invention, these problems have disappeared.
［発明の効果］
本発明によれば、転炉の吹錬において上記炭素律速の吹
錬期に吹錬時間を延長することなく、スピッティングを
防止することが出来、安定した操業を行うことが出来る
。[Effects of the Invention] According to the present invention, spitting can be prevented in the blowing of a converter without extending the blowing time during the carbon-controlled blowing period, and stable operation can be performed. I can do it.
第１図は本発明の一実施例を示す方法に用いる酸素ラン
スのノズルを示す図である。
１１・・・酸素用ノズル、１２・・・不活性ガス用ノズ
ル。FIG. 1 is a diagram showing a nozzle of an oxygen lance used in a method illustrating an embodiment of the present invention. 11... Oxygen nozzle, 12... Inert gas nozzle.
Claims (1)
の流量を一定として、炭素律速の吹錬期に酸素と同時に
不活性ガスを酸素に対して０．１乃至０．５の割合で酸
素ジェットを囲むように吹き込み、スラグに含まれるＦ
ｅＯの割合を制御することを特徴とする転炉吹錬法。In the converter blowing method, the flow rate of gas injected from the oxygen lance is kept constant, and an inert gas is simultaneously injected with oxygen at a ratio of 0.1 to 0.5 to oxygen during the carbon-controlled blowing period. Blow in around the slag to remove F contained in the slag.
A converter blowing method characterized by controlling the proportion of eO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62280639A JPH01123016A (en) | 1987-11-06 | 1987-11-06 | Blowing method for converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62280639A JPH01123016A (en) | 1987-11-06 | 1987-11-06 | Blowing method for converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01123016A true JPH01123016A (en) | 1989-05-16 |
Family
ID=17627857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62280639A Pending JPH01123016A (en) | 1987-11-06 | 1987-11-06 | Blowing method for converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01123016A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6017380A (en) * | 1995-01-06 | 2000-01-25 | Nippon Steel Corporation | Top-blown refining method in converter featuring excellent decarburization and top-blown lance for converter |
| JP2007518883A (en) * | 2004-01-23 | 2007-07-12 | プラクスエア・テクノロジー・インコーポレイテッド | Low carbon steel manufacturing method |
-
1987
- 1987-11-06 JP JP62280639A patent/JPH01123016A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6017380A (en) * | 1995-01-06 | 2000-01-25 | Nippon Steel Corporation | Top-blown refining method in converter featuring excellent decarburization and top-blown lance for converter |
| JP2007518883A (en) * | 2004-01-23 | 2007-07-12 | プラクスエア・テクノロジー・インコーポレイテッド | Low carbon steel manufacturing method |
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