JPS63235422A - Method for protecting bottom blowing nozzle in converter - Google Patents
Method for protecting bottom blowing nozzle in converterInfo
- Publication number
- JPS63235422A JPS63235422A JP6910787A JP6910787A JPS63235422A JP S63235422 A JPS63235422 A JP S63235422A JP 6910787 A JP6910787 A JP 6910787A JP 6910787 A JP6910787 A JP 6910787A JP S63235422 A JPS63235422 A JP S63235422A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- converter
- nozzle
- bottom blowing
- 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.)
- Pending
Links
- 238000007664 blowing Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 50
- 239000010959 steel Substances 0.000 claims abstract description 50
- 239000007789 gas Substances 0.000 claims abstract description 34
- 238000010079 rubber tapping Methods 0.000 claims abstract description 8
- 239000011261 inert gas Substances 0.000 claims abstract description 4
- 230000003628 erosive effect Effects 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 230000015271 coagulation Effects 0.000 description 8
- 238000005345 coagulation Methods 0.000 description 8
- 229910052786 argon Inorganic materials 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 229910000514 dolomite Inorganic materials 0.000 description 2
- 239000010459 dolomite Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Landscapes
- 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、転炉底吹きノズルを吹錬中の溶鋼から保護
する転炉底吹きノズルの保護方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for protecting a converter bottom blowing nozzle for protecting the converter bottom blowing nozzle from molten steel during blowing.
［従来の技術］
従来、鋼の精錬においては、精錬効率が高い純ＩＩ素上
吹き転炉が多く採用されている。このｉｌＴ！酸素上吹
き吹錬では、転炉上部の開口部から転炉内にランスを挿
入し、このランスの先端から転炉内に酸素ガスを吹込ん
で溶鋼を精錬するが、吹錬末期には酸素ガスの攪拌力が
不足して脱炭効率が低下するという欠点を有する。この
ような欠点を解消するために、近時、転炉の底部に羽口
を設け、底吹きノズルを介してこの羽口から溶鋼に対し
て不活性なガスを溶鋼中に吹込んで、溶鋼の攪拌力を増
加させる技術が採用されている。この技術によれば、ラ
ンスから供給される酸素ガスの攪拌力に底吹きガスの攪
拌力が加えられるので、吹錬末期においても脱炭反応が
促進され、高品質の鋼を製造するのに適している。しか
しながら、この技術の場合には、底吹きノズルに溶鋼が
接し、しかも溶鋼が底吹きガスにより攪拌されるので、
底吹きノズルの溶損が激しく、交換頻度が高くなってし
まう。このため、底吹きノズルを保護するために出鋼後
に転炉内にスラグを残留させ、この残留スラグに軽焼ド
ロマイト及び生ドロマイトを各１乃至３トン添加し、炉
底をスラグコーティングする技術が採用されている。ま
た、この他に転炉開口部から吹付はガンにより粉末の吹
付は剤を底吹きノズルに吹付けて羽口部をコーティング
する技術も採用されている。[Prior Art] Conventionally, in the refining of steel, pure II elementary top-blown converters, which have high refining efficiency, have often been employed. This ilT! In oxygen top blowing, a lance is inserted into the converter through the opening at the top of the converter, and oxygen gas is blown into the converter from the tip of the lance to refine the molten steel. The disadvantage is that the stirring power is insufficient and the decarburization efficiency is reduced. In order to eliminate these drawbacks, recently a tuyere is installed at the bottom of the converter, and a gas inert to the molten steel is blown into the molten steel from the tuyere through a bottom blowing nozzle. Techniques are employed to increase the stirring power. According to this technology, the stirring power of the bottom blowing gas is added to the stirring power of the oxygen gas supplied from the lance, so the decarburization reaction is promoted even in the final stage of blowing, making it suitable for producing high-quality steel. ing. However, in the case of this technology, the molten steel comes into contact with the bottom blowing nozzle, and the molten steel is stirred by the bottom blowing gas.
The bottom blow nozzle is severely damaged and needs to be replaced frequently. Therefore, in order to protect the bottom blowing nozzle, slag is left in the converter after tapping, and 1 to 3 tons each of light burnt dolomite and raw dolomite are added to the remaining slag to coat the bottom of the furnace with slag. It has been adopted. In addition, a technique has also been adopted in which powder is sprayed from the converter opening using a gun and sprayed onto a bottom blowing nozzle to coat the tuyeres.
［発明が解決しようとする問題点］
しかしながら、前者の場合には、スラグコーティングに
より底吹きノズルが閉塞してしまう虞がある。また、後
者の場合には、吹付けに１０乃至１５分間を要し、能率
が低下するため、各ヒート毎に吹付けることが困難であ
ると共に、吹付は剤の費用によりコストが上昇するとい
う問題点がある。[Problems to be Solved by the Invention] However, in the former case, there is a risk that the bottom blowing nozzle may be blocked by the slag coating. In the latter case, it takes 10 to 15 minutes to spray, which reduces efficiency, making it difficult to spray for each heat, and the cost of spraying increases due to the cost of the agent. There is a point.
この発明は斯かる事情に鑑みてなされたものであって、
底吹きノズルを閉塞することなく、また、作業効率を低
下させずに低コストで底吹きノズルを有効に保護するこ
とができる転炉底吹きノズルの保護方法を提供すること
を目的とする。This invention was made in view of such circumstances, and
An object of the present invention is to provide a method for protecting a bottom blowing nozzle of a converter, which can effectively protect the bottom blowing nozzle at low cost without clogging the bottom blowing nozzle or reducing work efficiency.
［問題点を解決するための手段］
この発明に係る転炉底吹きノズルの保護方法は、転炉の
底部に設けられ転炉内雰囲気化で不活性なガスを溶鋼中
に吹込む底吹きノズルを保護する転炉底吹きノズルの保
護方法であって、出鋼終了後に転炉内に残留した溶鋼に
底吹きノズルから転炉内にガスを吹込み、このガスによ
り底吹きノズル羽口の周囲の溶鋼を冷却して凝固させる
ことを特徴とする。[Means for Solving the Problems] A method for protecting a converter bottom blowing nozzle according to the present invention includes a bottom blowing nozzle that is provided at the bottom of the converter and blows inert gas into molten steel to create an atmosphere inside the converter. A method for protecting the bottom blowing nozzle of a converter, in which gas is blown into the converter from the bottom blowing nozzle into the molten steel remaining in the converter after the completion of tapping, and the gas protects the area around the tuyere of the bottom blowing nozzle. It is characterized by cooling and solidifying molten steel.
［作用］
この発明においては、上述のように、転炉内に溶鋼を残
留させ、この残留溶鋼に底吹きノズルからガスを吹込ん
でノズルの羽口周囲の溶鋼を冷却して凝固させるから、
この凝固した溶鋼によって底吹きノズルの羽口が覆われ
、これにより底吹きノズルが吹錬中のＷＪＩｊ４から保
護される。この場合に、残留溶鋼により底吹きノズルを
保護するので、この残留溶鋼が吹錬中の溶鋼によって溶
融する虞が少なく、底吹きノズルを有効に保護すること
ができる。[Function] As described above, in this invention, molten steel is left in the converter, and gas is blown into the residual molten steel from the bottom blowing nozzle to cool and solidify the molten steel around the tuyere of the nozzle.
The solidified molten steel covers the tuyere of the bottom blowing nozzle, thereby protecting the bottom blowing nozzle from WJIj4 during blowing. In this case, since the bottom blowing nozzle is protected by the residual molten steel, there is little risk that this residual molten steel will be melted by the molten steel during blowing, and the bottom blowing nozzle can be effectively protected.
［実施例］
以下、添付区間を参照してこの発明の実施例について具
体的に説明する。[Embodiments] Hereinafter, embodiments of the present invention will be specifically described with reference to the attached sections.
第１図は、底吹きノズルが設けられた転炉を示す模式図
である。転炉１は、鉄皮２に耐火レンガ３が内張すされ
て構成されており、その底壁には、２箇所に羽口４が形
成されており、この羽口４には金属製のノズル５が連結
されている。このノズル５は図示しないガス供給装置に
接続されており、このガス供給装置からノズル５及び羽
口４を介して転炉１内にアルゴンガスが供給されるよう
になっている。吹錬に際しては、この転炉１の内部に溶
鋼が貯留され、図示しないランスからこの溶鋼に酸素ガ
スを吹込みつつ、羽口４からアルゴンガスを吹込んで溶
鋼を攪拌するようになっている。FIG. 1 is a schematic diagram showing a converter equipped with a bottom blowing nozzle. The converter 1 consists of an iron shell 2 lined with refractory bricks 3, and tuyeres 4 are formed at two locations on the bottom wall of the converter 1. A nozzle 5 is connected. This nozzle 5 is connected to a gas supply device (not shown), and argon gas is supplied from this gas supply device into the converter 1 through the nozzle 5 and the tuyeres 4. During blowing, molten steel is stored inside the converter 1, and while oxygen gas is blown into the molten steel from a lance (not shown), argon gas is blown from the tuyere 4 to stir the molten steel.
出講口６は転炉１の周壁に設けられており、吹錬後に転
炉１を傾動させて溶鋼をこの出鋼口６がら出鋼する。A tapping port 6 is provided on the peripheral wall of the converter 1, and after blowing, the converter 1 is tilted to tap the molten steel through the tapping port 6.
次に、この実施例の動作について説明する。吹錬終了後
、転炉１を傾動させて出鋼口６から溶鋼を出鋼し、その
後転炉１を起立させる。この場合に、転炉１内には若干
の溶鋼が残留する。次いで、ガス供給装置からバイブ５
及び羽口４を介して転炉１内にアルゴンガスを吹込む。Next, the operation of this embodiment will be explained. After the blowing is completed, the converter 1 is tilted to tap molten steel from the tapping port 6, and then the converter 1 is stood up. In this case, some molten steel remains in the converter 1. Next, the vibe 5 is removed from the gas supply device.
Then, argon gas is blown into the converter 1 through the tuyeres 4.
そうすると、ガスの吹込み力により羽口４周囲の残留溶
鋼が盛上がると共に、この溶鋼がガスにより冷却されて
凝固し、凝固部７を形成する。そして、この凝固部７に
よりノズル５の羽口４部分が覆われる。この場合に、衣
類の溶鋼を転炉１に装入しても、凝固部７は溶鋼と同質
であるため、この溶鋼によっては凝固部７は殆ど溶融し
ない。このため、この凝固部７によりノズル５が溶鋼か
ら有効に保護され、これによりノズル５の溶損が抑制さ
れる。Then, the residual molten steel around the tuyere 4 swells due to the blowing force of the gas, and this molten steel is cooled by the gas and solidified to form a solidified portion 7. The solidified portion 7 covers the tuyere 4 portion of the nozzle 5. In this case, even if the molten steel of clothing is charged into the converter 1, the solidified portion 7 is of the same quality as the molten steel, so the solidified portion 7 is hardly melted by the molten steel. Therefore, the solidified portion 7 effectively protects the nozzle 5 from molten steel, thereby suppressing melting damage of the nozzle 5.
次に、アルゴンガスの吹込み量と凝固部７の生成量との
関係について説明する。第２図に示すように、凝固部７
はノズル７の直上部が盛上がった状態で形成され、この
凝固部７の高さは図中ａで示される。第３図は、横軸に
ガス吹込み時間をとり、縦軸に凝固部７の高さをとって
、ガス吹込み時間と凝ｒ！ｊＪａ８生成量との関係を示
すグラフ図であり、ガス流量が０．１乃至０．５Ｎｍ３
／分の場合について示す。これによれば、凝固部７の高
さは、ガスの供給量と供給時間により数ｌｌ１ｍから数
十１の間で変化し、例えば、０．５Ｎｍ” ／分の流量
でガスを供給した場合には６分間で約５０ＩＩＩＩの高
ざの凝固部が形成され、０．ｌＮｍ３／分の流量の場合
には６分間で約１０１ｍ１の高さの凝固部が形成される
。従って、このガスの供給量及び供給時間を調節するこ
とにより凝固部７の生成量を任意に設定することができ
る。なお、この場合に、第２図中すで示す凝固部７の幅
は、２０乃至３０ＩＩである。Next, the relationship between the amount of argon gas blown and the amount produced in the coagulation section 7 will be explained. As shown in FIG.
is formed in a raised state directly above the nozzle 7, and the height of this solidified portion 7 is indicated by a in the figure. In FIG. 3, the horizontal axis shows the gas blowing time, and the vertical axis shows the height of the coagulation section 7, and the gas blowing time and the coagulation r! It is a graph diagram showing the relationship with the amount of jJa8 produced, and the gas flow rate is 0.1 to 0.5 Nm3.
The case of /min is shown below. According to this, the height of the coagulation section 7 varies from several 11 m to several tens of meters depending on the gas supply amount and supply time, and for example, when gas is supplied at a flow rate of 0.5 Nm''/min. In the case of a flow rate of 0.1Nm3/min, a solidification part with a height of about 101m1 is formed in 6 minutes.Therefore, the supply amount of this gas is The production amount of the coagulation part 7 can be arbitrarily set by adjusting the supply time and the amount of coagulation part 7. In this case, the width of the coagulation part 7 already shown in FIG. 2 is 20 to 30 II.
第４図は、横軸に溶鋼のチャージ数をとり、縦軸にノズ
ル５の高さをとって、ノズル５の寿命を示すグラフ図で
ある。図中実線は実施例を示し、破線は従来例を示す。FIG. 4 is a graph showing the life of the nozzle 5, with the horizontal axis representing the number of charges of molten steel and the vertical axis representing the height of the nozzle 5. In the figure, solid lines indicate the embodiment, and broken lines indicate the conventional example.
これによれば、従来例の場合にはノズル高さの変化、即
ちノズルの溶損量が１チャージ当り０．４ａ＋ｉである
のに対し、実施例の場合には１チャージ当り０．１ｍｍ
とノズルの溶損量が従来の１／４であり、ノズルの寿命
が約４倍になることがわかる。According to this, in the case of the conventional example, the change in nozzle height, that is, the amount of erosion of the nozzle, is 0.4a+i per charge, whereas in the case of the embodiment, it is 0.1mm per charge.
It can be seen that the amount of nozzle erosion is 1/4 of that of the conventional method, and the nozzle life is about 4 times longer.
なお、この実施例では吹込みガスとしてアルゴンガスを
使用したが、これに限らず、−酸化炭素ガス又は窒素ガ
ス等溶鋼に対して不活性なガスであれば使用することが
できる。In this embodiment, argon gas was used as the blowing gas, but the invention is not limited to this, and any gas that is inert to molten steel, such as -carbon oxide gas or nitrogen gas, can be used.
［発明の効果］
この発明によれば、転炉内に溶鋼を残留させ、この残留
溶鋼に底吹きノズルからガスを吹込んでノズルの羽口周
囲の溶鋼を冷却して凝固させるので、この残留溶鋼が衣
類の溶鋼により溶融する虞が少なく、この凝固溶鋼によ
り底吹きノズルを有効に保護することができ、底吹きノ
ズルの寿命を延長することができる。この場合に、底吹
きノズルにガスを吹込んでいるので、底吹きノズルが閉
塞する虞が少なく、残留溶鋼及び底吹きガスを利用する
ので、＾作業効率、低コストで底吹きノズルを保護する
ことができる。[Effects of the Invention] According to the present invention, molten steel is left in the converter, and gas is blown into the residual molten steel from the bottom blowing nozzle to cool and solidify the molten steel around the tuyere of the nozzle. There is little risk that the bottom blowing nozzle will be melted by the molten steel in the clothing, and the bottom blowing nozzle can be effectively protected by the solidified molten steel, thereby extending the life of the bottom blowing nozzle. In this case, since gas is blown into the bottom blowing nozzle, there is less risk of the bottom blowing nozzle becoming clogged, and since the residual molten steel and bottom blowing gas are used, the bottom blowing nozzle can be protected with high work efficiency and low cost. Can be done.
第１図はこの発明の実施例の実施状態における転炉を示
す断面図、第２図はその底吹きノズルの羽口部分を示す
模式図、第３図はガス供給」及び供給時間と溶鋼の凝固
部の生成量の関係を示すグラフ図、第４図はこの発明の
効果を示すグラフ図である。
１：転炉、４；羽口、５：ノズル、７：凝固部出願人代
理人 弁理士 鈴江武彦
第１図
第２図Fig. 1 is a cross-sectional view showing a converter in an embodiment of the present invention, Fig. 2 is a schematic diagram showing the tuyere portion of the bottom blowing nozzle, and Fig. 3 is a diagram showing the gas supply, supply time, and flow rate of molten steel. FIG. 4 is a graph showing the relationship between the amount of solidified portions produced, and FIG. 4 is a graph showing the effects of the present invention. 1: Converter, 4: Tuyere, 5: Nozzle, 7: Coagulation Department Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2
Claims (1)
溶鋼中に吹込む底吹きノズルを保護する転炉底吹きノズ
ルの保護方法において、出鋼終了後に転炉内に残留した
溶鋼に底吹きノズルから転炉内にガスを吹込み、このガ
スにより底吹きノズル羽口の周囲の溶鋼を冷却して凝固
させることを特徴とする転炉底吹きノズルの保護方法。In the method for protecting the bottom blowing nozzle of a converter, which protects the bottom blowing nozzle that is installed at the bottom of the converter and blows inert gas into the molten steel under the atmosphere inside the converter, molten steel that remains in the converter after tapping is completed. A method for protecting a bottom-blowing nozzle of a converter, characterized by blowing gas into the converter from a bottom-blowing nozzle, and using the gas to cool and solidify molten steel around the tuyere of the bottom-blowing nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6910787A JPS63235422A (en) | 1987-03-25 | 1987-03-25 | Method for protecting bottom blowing nozzle in converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6910787A JPS63235422A (en) | 1987-03-25 | 1987-03-25 | Method for protecting bottom blowing nozzle in converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63235422A true JPS63235422A (en) | 1988-09-30 |
Family
ID=13393073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6910787A Pending JPS63235422A (en) | 1987-03-25 | 1987-03-25 | Method for protecting bottom blowing nozzle in converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63235422A (en) |
-
1987
- 1987-03-25 JP JP6910787A patent/JPS63235422A/en active Pending
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