JPS63145709A - Method and apparatus for refining of steel - Google Patents
Method and apparatus for refining of steelInfo
- Publication number
- JPS63145709A JPS63145709A JP61292593A JP29259386A JPS63145709A JP S63145709 A JPS63145709 A JP S63145709A JP 61292593 A JP61292593 A JP 61292593A JP 29259386 A JP29259386 A JP 29259386A JP S63145709 A JPS63145709 A JP S63145709A
- Authority
- JP
- Japan
- Prior art keywords
- steel
- refining
- molten steel
- gas
- combustion burner
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 110
- 239000010959 steel Substances 0.000 title claims abstract description 110
- 238000007670 refining Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims description 35
- 239000007789 gas Substances 0.000 claims abstract description 63
- 238000002485 combustion reaction Methods 0.000 claims abstract description 43
- 238000003756 stirring Methods 0.000 claims abstract description 22
- 239000000446 fuel Substances 0.000 claims abstract description 21
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 7
- 239000000295 fuel oil Substances 0.000 claims abstract description 7
- 239000003345 natural gas Substances 0.000 claims abstract description 5
- 238000005261 decarburization Methods 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000001590 oxidative effect Effects 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 5
- 239000003034 coal gas Substances 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 18
- 230000003647 oxidation Effects 0.000 abstract description 16
- 239000002184 metal Substances 0.000 abstract description 15
- 229910052751 metal Inorganic materials 0.000 abstract description 15
- 239000002893 slag Substances 0.000 abstract description 8
- 239000003638 chemical reducing agent Substances 0.000 abstract description 4
- 239000003245 coal Substances 0.000 abstract description 2
- 230000000452 restraining effect Effects 0.000 abstract 1
- 150000002739 metals Chemical class 0.000 description 10
- 238000004904 shortening Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- -1 Cr is reduced Chemical class 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000002485 urinary effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、低炭素鋼、炭素鋼、低合金鋼９合金銅、ステ
ンレス鋼などの精錬に利用される鋼の精錬方法および精
錬装置に関するものである。[Detailed Description of the Invention] [Object of the Invention] (Field of Industrial Application) The present invention provides a steel refining method used for refining low carbon steel, carbon steel, low alloy steel 9 alloy copper, stainless steel, etc. and related to refining equipment.
（従来の技術）
従来、各種鋼の精錬方法としては、主に量産鋼の製造に
おいて採用されるものに転炉製鋼法や電気炉製鋼法があ
り、各種鋼のうちでもとくにステンレス鋼の精錬方法と
しては、上記転炉製鋼法や電気炉製鋼法のほかに、ＶＯ
Ｄ精錬法（真空脱炭法）、ＡＯＤ精錬法（アルゴン・酸
素脱炭法）などがある。(Conventional technology) Conventionally, methods for refining various types of steel include converter steel manufacturing and electric furnace steel manufacturing, which are mainly used in the manufacture of mass-produced steel. In addition to the above-mentioned converter steelmaking method and electric furnace steelmaking method, VO
There are D refining method (vacuum decarburization method), AOD refining method (argon/oxygen decarburization method), etc.
これらのうち、例えばＡＯＤ精錬法は、ｓｅｅガスとと
もに不活性ガス（Ａ ｒ 、 Ｎ、 ）を鋼浴中に吹き
込み、００分圧を低下させてＣｒの酸化損失を抑制しな
がら脱炭を行い、この際の脱炭を効率よく行うために、
高炭素領域から低炭素領域に脱炭が進行するにしたがっ
て、鋼浴中に吹き込む０２／Ａｒ比を低くするようにし
た精錬方法である。なお、稀釈ガスとして高価なＡｒの
代わりに水蒸気を使用するＣＬＵ精錬法もある。Among these, for example, the AOD refining method injects inert gas (Ar, N, ) into the steel bath together with see gas to reduce the partial pressure and perform decarburization while suppressing oxidation loss of Cr. In order to decarburize efficiently at this time,
This is a refining method in which the 02/Ar ratio blown into the steel bath is lowered as decarburization progresses from a high carbon region to a low carbon region. Note that there is also a CLU refining method that uses water vapor as a diluent gas instead of expensive Ar.
このＡＯＤ精錬法においては、溶鋼に対して外部から加
熱する機能を具備しておらず、精錬中における熱の補償
を行うために、一般に精錬の開始前に、必要に応じて加
炭を実施することにより溶鋼中の平均Ｃ含有量を１．０
〜２．０重量％にし、精錬においては上記Ｃの酸化反応
熱を利用するようにしていた。This AOD refining method does not have a function to heat the molten steel from the outside, and in order to compensate for the heat during refining, carburization is generally performed as necessary before the start of refining. This reduces the average C content in molten steel to 1.0.
~2.0% by weight, and the heat of the oxidation reaction of C was used in refining.
そのため、脱炭に要する時間が長くかかるとか、熱の補
償のためにＣｒを一部酸化したあと後玉程で高価なＳｔ
により再口元する必要があるとか、グイナミフクな温度
管理のために最終出鋼時の温度コントロールが困難であ
るとか、などという問題点を有していた。For this reason, it takes a long time to decarburize, and after partially oxidizing Cr to compensate for the heat, it is necessary to use St.
There were problems such as the need to re-dip the steel, and the difficult temperature control during the final tapping process.
そのほか、上記のＡＯＤ精錬法に限らず各種鋼の精錬方
法においても、精錬に必要な熱の補償を行うために、電
気加熱を採用したり、Ｃおよびその他の金属の反応熱を
生じさせるべく酸素の吹き込みを採用したりすることが
行われているが、エネルギー原単位が悪いとか、有価金
属の酸化ロスが多いとか、有価金属の還元回収に用いる
Ｓｔの必要へ１が多いとか、などという問題点を有して
いた。In addition, not only the above-mentioned AOD refining method but also various steel refining methods employ electric heating to compensate for the heat necessary for refining, and oxygen to generate reaction heat of carbon and other metals. However, there are problems such as poor energy consumption, high oxidation loss of valuable metals, and the need for a large amount of St used for reduction and recovery of valuable metals. It had a point.
（発明の目的）
本発明は、上述した従来の問題点に着目してなされたも
ので、鋼の精錬に際して脱炭時間を短縮することが可能
であり、Ｃｒ等の有価金属の酸化損失！Ｉｉが少なくか
つ当該酸化物還元のための時間が短縮されると同時に還
元剤の使用量をも低減することが可能である鋼の精錬方
法を提供することを目的としているものである。(Object of the Invention) The present invention has been made in view of the above-mentioned conventional problems, and it is possible to shorten the decarburization time during steel refining, and reduce the oxidation loss of valuable metals such as Cr. It is an object of the present invention to provide a method for refining steel in which Ii is small, the time for reducing the oxide is shortened, and at the same time, the amount of reducing agent used can be reduced.
「発明の構成」 （問題点を解決するための「一段） 本発明による鋼の精錬方法は、電気炉、転炉。"Structure of the invention" (“One step” to solve the problem) The method for refining steel according to the present invention includes an electric furnace and a converter.
精錬容器（ＡＯＤ炉、ＶＯＤ炉など）等の炉内に収容さ
れた溶鋼中に吹き込んだガスにより尚該溶鋼を強制攪拌
しながら精錬を実施するに際し、重油、微粉炭、天然ガ
スなどの燃料源を用いる燃焼バーナーにより、前記強制
攪拌によって受熱面積が拡大された鋼浴面に対して熱の
伝達拳供給を行いつつ精錬を実施するようにしたことを
特徴としているものである。When performing refining while forcibly stirring the molten steel with gas injected into the molten steel housed in a furnace such as a refining vessel (AOD furnace, VOD furnace, etc.), fuel sources such as heavy oil, pulverized coal, and natural gas are used. The method is characterized in that refining is carried out using a combustion burner that uses a combustion burner to conduct heat transfer and supply to the steel bath surface whose heat receiving area has been expanded by the forcible stirring.
本発明による鋼の精錬方法が適用される炉は、前記した
ように、電気炉などＱごと〈外部からの加熱機能を有す
るもののほか、外部からの加８機能をも７’、 ｉｔ
イ、ＡＯＤ炉、ＣＬＵ炉、ＶＯＤ炉や転炉などにも適用
することが可能である。As mentioned above, the furnace to which the steel refining method of the present invention is applied is an electric furnace, etc.
B. It can also be applied to AOD furnaces, CLU furnaces, VOD furnaces, converters, etc.
そして、炉内の溶鋼中にガスを吹き込んで当該溶鋼を強
制攪拌し、これによって溶鋼上面の受熱面積を拡大する
ようにしているが、この場合のガスとしては、溶鋼中に
おいて脱炭反応を生じさせる作用を有する酸化性ガス（
０２あるいは０２富化気体など）を用いることができ、
あるいは溶鋼に対する強制Ｗｌ拌の作用を有する不活性
ガス（Ａ ｒ 、 Ｎ２あるいはこれらの富化気体など
）を用いることができ、さらには酸化性ガス吹き出し用
羽目の保護などのために酸化性ガスと当該酸化性ガスを
取囲むようにして供給する不活性ガスとを同時に用いる
こともできる。Then, gas is injected into the molten steel in the furnace to forcibly stir the molten steel, thereby expanding the heat receiving area on the top surface of the molten steel.In this case, the gas causes a decarburization reaction in the molten steel. Oxidizing gas (
02 or 02-enriched gas) can be used,
Alternatively, an inert gas (Ar, N2, or a gas enriched with these gases, etc.) that has the effect of forced Wl stirring on molten steel can be used, and furthermore, it is possible to use an inert gas (such as Ar, N2, or a gas enriched with these gases) that has a forced Wl stirring effect on the molten steel. An inert gas which is supplied to surround the oxidizing gas can also be used at the same time.
そして、本発明においては、炉内の溶鋼中に吹き込んだ
上記ガスにより当該溶鋼を強制撹拌しながら精錬を実施
するに際し、重油、微粉炭、天然ガスなどの可燃性の燃
料源を用いる燃焼バーナーにより、前記強制攪拌によっ
て受熱面積が拡大された鋼浴面に対して熱の伝達・供給
を行いつつ精錬を実施するようにしているが、この場合
、燃焼バーナーに供給される酸化性ガスとしては、空気
を使用することができないわけではないが、より望まし
くは、１００体積％０２ガス、あるいは３０体積％以上
の０２を含む不燃性ガス（例えばＮ２．Ａｒなど）から
なる混合ガスを使用し。In the present invention, when performing refining while forcibly stirring the molten steel with the gas blown into the molten steel in the furnace, a combustion burner using a combustible fuel source such as heavy oil, pulverized coal, or natural gas is used. In this case, the oxidizing gas supplied to the combustion burner is: Although air cannot be used, it is more desirable to use 100% by volume 02 gas, or a mixed gas consisting of a nonflammable gas (for example, N2, Ar, etc.) containing 30% by volume or more of 02.
これによって高温の火炎が得られるようにする。This allows a high temperature flame to be obtained.
また、脱炭反応が０２供給律速である溶鋼中のＣ含有ｊ
１１領域、通常はＣ含有ｊ１（が０．２０屯１５％４′
１”瓜以−１−の領域では、燃才４源に対する理論酸、
＃：要求ｊ１１よりも多くの０２源を供給することによ
って、脱炭反応により鋼浴面上に発生するＣＯをさらに
燃焼させ、Ｃ０２とする際に発生する反応熱エネルギー
を有効活用し、前記燃焼エネルギーを前記強制撹拌によ
って受熱面積が拡大された鋼浴面に対して伝達・供給さ
せることにより溶鋼温度を上昇させ、Ｃｒの酸化を抑制
しながら脱炭反応をより一層促進させるようにするがよ
い。In addition, the C content in molten steel where the decarburization reaction is rate-limiting in the supply of 02
11 area, usually C-containing j1 (0.20 tons 15% 4'
In the region of 1" urinary acid, the theoretical acid for the four sources of fuel,
#: By supplying more 02 sources than the request j11, the CO generated on the steel bath surface by the decarburization reaction is further combusted, and the reaction heat energy generated when converting it to CO2 is effectively used, and the combustion It is preferable to increase the temperature of the molten steel by transmitting and supplying energy to the steel bath surface whose heat receiving area has been expanded by the forced stirring, thereby further promoting the decarburization reaction while suppressing the oxidation of Cr. .
この場合、燃料源に対する理論酸素要求を辻よりも多く
の０２源を供給するに際しては、前記燃焼バーナーに供
給される酸化性ガスによるｏ２源供給１−を増大させる
ことによって＝Ｔ能であるが、燃焼バーナーとは別に０
２源を鋼浴面ヒに供給するようになすことも＝ｆ能であ
り１本発明の技術的範囲に含まれる。In this case, when supplying more O2 sources than the theoretical oxygen demand for the fuel source, = T ability is achieved by increasing the O2 source supply 1- by the oxidizing gas supplied to the combustion burner. , 0 apart from the combustion burner
It is also possible to supply two sources to the steel bath surface and is within the technical scope of the present invention.
そして、本発明による鋼の精錬方法においては、上記燃
焼バーナーからの火炎が、鋼浴面に向けてカウンタ一方
式で噴射されるように設定することがとくに望ましい。In the method for refining steel according to the present invention, it is particularly desirable to set the flame from the combustion burner to be injected in a counter-unidirectional manner toward the surface of the steel bath.
なお、加熱源としては一般にアーク加熱を採用すること
も考えられるが、本発明においては溶鋼の受熱面積拡大
のために当該溶鋼を強制攪拌することを要件としている
ので、このような＠制攪拌のもとではアーク加熱は採用
しにくいことから、スクラップ等の原材料の溶解にアー
ク加熱を用いたとしても、その後の脱炭等の精錬時には
燃焼バーナーによる加熱を採用することとした。Although it is generally possible to use arc heating as a heating source, the present invention requires forcible stirring of the molten steel in order to expand the heat receiving area of the molten steel. Under the current circumstances, it would be difficult to use arc heating, so even if arc heating is used to melt raw materials such as scrap, it was decided to use combustion burners for subsequent refining such as decarburization.
本発明による鋼の精錬方法を実施するための精錬装置は
、溶鋼を収容する炉体と、炉内の溶鋼中にガスを吹さ込
んで当該溶鋼を強制撹拌するガス送給手段と、前記強制
撹拌によって受熱面積が拡大された鋼浴面に対して熱の
伝達・供給を行う燃焼バーナーと、前記燃焼バーナーに
燃料源を供給する燃料源供給手段と、前記燃焼バーナー
にＯ２速：１を供給する０２源供給手段と、排ガス中の
ＣＯ＋１ｊ、’を測定するＣＯ星計測−Ｆ段と、を備え
たことを特徴としており、必黄に応じて前記燃焼バーナ
ーとは別に鋼浴面に対し０２源を供給するための０２源
供給手段を右している場合も本発明に包含されるもので
ある。A refining apparatus for carrying out the steel refining method according to the present invention includes a furnace body containing molten steel, a gas supply means for injecting gas into the molten steel in the furnace and forcibly stirring the molten steel, and a gas supply means for forcibly stirring the molten steel. A combustion burner that transfers and supplies heat to a steel bath surface whose heat receiving area has been expanded by stirring, a fuel source supply means that supplies a fuel source to the combustion burner, and supplies O2 speed: 1 to the combustion burner. The system is characterized by being equipped with an 02 source supply means for measuring CO+1j,' in the exhaust gas, and a CO star measurement-F stage for measuring CO+1j,' in the exhaust gas. The present invention also includes the case where the 02 source supply means for supplying the source is provided.
第１図は本発明の一実施態様を示す図であって、本発明
による鋼の精錬方法を実施するのに直接使用する第１図
に示す精錬装置は、溶＃４１を収容する炉体２の上端に
炉蓋３を有し、炉体２のド部側には、０２ガスを吹き込
む内管４ａとＡｒ力′スを吹き込む外管４ｂとからなる
羽口４を備えており、この羽口４によって、炉内の溶鋼
１中にガスを吹き込んで当該溶ｍ１を強制撹拌するガス
送給、Ｆ段を構成させている。FIG. 1 is a diagram showing one embodiment of the present invention, and the refining apparatus shown in FIG. 1, which is directly used to carry out the steel refining method according to the present invention, has a furnace body 2 containing melt #41. A furnace lid 3 is provided at the upper end, and a tuyere 4 is provided on the door side of the furnace body 2, consisting of an inner tube 4a for blowing in 02 gas and an outer tube 4b for blowing in Ar gas. The port 4 constitutes a gas feeding stage F, which blows gas into the molten steel 1 in the furnace and forcibly stirs the molten steel m1.
また、炉体２の北部には傾斜した出鋼ｒ＋ ５を有して
いる。Further, the northern part of the furnace body 2 has an inclined tap r+5.
さらに、炉盃３には、１ｉｉｆ記強制撹拌によって受熱
面積が拡大された溶鋼１の鋼浴表面に対して熱の伝達・
供給を行うための燃焼バーナ−６を備えている、この燃
焼バーナー６は、燃料源供給手段への接続ロＯａ、０２
源供給手段への接続口６ｂを有していると共に、冷却水
の導入口６Ｃおよび排出口６ｄを右しており、冷却可能
な構造となっている。そして、この場合、燃焼バーナー
６は垂直方向に設置されており、当該燃焼バーナー６か
らの火炎７が溶鋼１の表面に向けてカウンターグロ一方
式で噴射されるように設定している。すなわち、強制撹
拌によって受熱面積が拡大された鋼浴面に対して熱の伝
達壷供給が効率的に行えるように、また、鋼浴面上に発
生するＣｏガスの気流方向と反対方向に０２源を吹き込
むことができるようにカウンターブロ一方式で火炎７が
噴射されるように設定している。Furthermore, the furnace cup 3 is provided with heat transfer and heat transfer to the steel bath surface of the molten steel 1 whose heat receiving area has been expanded by the forced stirring described in 1iif.
The combustion burner 6 is equipped with a combustion burner 6 for supply, which has a connection Oa, 02 to the fuel source supply means.
It has a connection port 6b to the source supply means, and has a cooling water inlet 6C and an outlet 6d on the right, so that it can be cooled. In this case, the combustion burner 6 is installed in a vertical direction, and the flame 7 from the combustion burner 6 is set to be injected toward the surface of the molten steel 1 in a counter-glowing manner. In other words, in order to efficiently supply heat to the steel bath surface whose heat receiving area has been expanded by forced stirring, the 02 source is placed in the opposite direction to the air flow direction of the Co gas generated on the steel bath surface. The flame 7 is set so that it can be injected using one type of counter blow so that the flame 7 can be injected.
そして、上記燃焼バーナー６に対して燃料源を送るため
の燃料源供給手段は、燃料源供給配管１１、流量計１２
．バルブ１３．燃料タンク１４、Ｎ２ガスなどの加圧媒
体供給配管１５゜バルブ１６．圧力計１７などから構成
されている。また、上記燃焼バーナー６に対して０２源
（ｉｏｏ体積％０２ガスないしは０２ガスを含む４ご合
ガス）を送るための０２源供給手段は、ｏ２源供給配管
２１．バルブ２２ 、２３ 、流量計２４などから構成
されている。The fuel source supply means for sending the fuel source to the combustion burner 6 includes a fuel source supply pipe 11 and a flow meter 12.
．． Valve 13. Fuel tank 14, pressurized medium supply pipe such as N2 gas 15° valve 16. It is composed of a pressure gauge 17 and the like. Further, the O2 source supply means for sending the O2 source (IOO volume % O2 gas or 4 mixed gas containing O2 gas) to the combustion burner 6 is the O2 source supply piping 21. It is composed of valves 22, 23, a flow meter 24, etc.
さらに、炉体２の上端に設置される炉蓋３には、上記燃
焼バーナー６を挿し込むための挿通孔３ａのほかに、排
ガス流出口３ｂが設けてあり、集塵フード２５内に排ガ
スが導びかれるようにしである。そして、排ガス流出口
３ｂには、当該排ガス中のＣｏ／ＣＯ２比をｉＭＩＩＩ
定するためのＣＯ琶計１Ｍ１１手１ｔとして（７）Ｃｏ
／ＣＯ２）−’） ２６が＆２けである。Furthermore, the furnace cover 3 installed at the upper end of the furnace body 2 is provided with an exhaust gas outlet 3b in addition to an insertion hole 3a for inserting the combustion burner 6, so that the exhaust gas can enter the dust collection hood 25. Let yourself be guided. Then, at the exhaust gas outlet 3b, the Co/CO2 ratio in the exhaust gas is adjusted to iMIII.
(7) Co as a total of 1M11 hands 1t
/CO2)-') 26 is &2 digits.
そこで、鋼の精錬に際しては、炉体２の内部に収容した
溶鋼１に対して、羽口４の内／ｉ？４ａから０２ガスを
吹き込むと同時に外ｐ ４ ｂからＡｒガスを吹き込ん
で当該ガスにより溶鋼１を強制撹拌し、この強制撹拌に
よって受熱面積が拡大された鋼浴面に対し、重油、微粉
度、天然ガスなどの燃料源および０２源を供給された燃
焼バーナー６から噴射される火炎７を向け、溶鋼温度を
高めて精錬中に必要な熱の補償を行い、従来のようなＣ
の酸化反応熱による熱補償に代えることによって、初期
Ｃ含有量を例えば０．８重量％程度に低減させることを
可能にして脱炭時間を短縮すると共に、Ｃｒ等の有価金
属の酸化を抑制して、当該有価金属の還元に必要なＳｉ
量の減少をはかり、スラグの生成量を減少させて除滓時
間の短縮ならびにエネルギー原中位の向上を実現する。Therefore, when refining steel, /i? At the same time as the 02 gas is blown from the outside P 4 b, the molten steel 1 is forcibly stirred by the gas, and heavy oil, fine powder, natural The flame 7 injected from the combustion burner 6 supplied with a fuel source such as gas and an 02 source is directed to increase the temperature of the molten steel to compensate for the heat required during refining, and
By replacing the heat compensation with the heat of oxidation reaction, it is possible to reduce the initial C content to, for example, about 0.8% by weight, shorten the decarburization time, and suppress the oxidation of valuable metals such as Cr. The Si necessary for the reduction of the valuable metal is
The aim is to reduce the amount of slag produced, thereby shortening the slag removal time and improving energy consumption.
また、上記の時間短縮およびＣｒ？の酸化物抑制によっ
て耐火物の溶損軽減を実現する。さらにはＣｒ鉱石の有
効利用も可能になる。In addition, the above time reduction and Cr? By suppressing oxides, corrosion loss of refractories is reduced. Furthermore, it becomes possible to effectively utilize Cr ore.
そして、上記精錬に際して燃焼バーナー６に対して０２
源供給配管２１を通して供給する酸化性ガスとして、３
０体積％以上の０２を含み、その値下燃性ガス（Ｎ２．
Ａｒ等）からなる混合ガス、あるいは１００体積％０２
ガスを用い、高温の火炎７を得ることができるようにし
て脱炭反応の促進ならびにＣｒ等の有価金属の酸化防止
を図るようにすることも望ましい。Then, during the above refining, 02
As the oxidizing gas supplied through the source supply piping 21, 3
Contains 0% by volume or more of 02, and below that level combustible gas (N2.
Ar, etc.) or 100% by volume 02
It is also desirable to be able to obtain a high-temperature flame 7 using gas to promote the decarburization reaction and prevent oxidation of valuable metals such as Cr.
また、上記精錬中において、脱炭反応が０２供給（１°
速である溶鋼中のＣ含有−に領域（通常はＣ２０，２０
改２Ｉｉ％）では、羽口４の内管４ａからの０２源の供
給に見あうＣｏガスが鋼浴面トに発生することから、こ
のＣＯの発生績をＣＯ／ ＣＯ２メーター２６により計
Ａｌｌ Ｌ 、上記燃焼バーナー６に接続した０２源供
給配管２１から、あるいは燃焼バーナー６とは別に設置
した図示しないｏ２源吹き込みノズルから、燃料源に対
する理論酸素要求量よりも多くの０２源を溶＃４１の浴
面とに供給して、鋼浴面より発生するＣＯを燃焼させて
ＣＯ２に変換し、この際の反応熱を利用して溶鋼１の温
度を効率よく上昇させ、これによっても脱）Ｒの促進な
らびにＣｒ等の有価金属の酸化抑制をはかるようにする
ことも望ましい。In addition, during the above refining, the decarburization reaction
The C content in the molten steel, which is
In the modified 2Ii%), Co gas corresponding to the supply of O2 source from the inner pipe 4a of the tuyere 4 is generated on the steel bath surface, so the CO generation history is measured by the CO/CO2 meter 26. , from the O2 source supply pipe 21 connected to the combustion burner 6 or from an O2 source blowing nozzle (not shown) installed separately from the combustion burner 6, a larger amount of O2 source than the theoretical oxygen demand for the fuel source is supplied to the melt #41. The CO generated from the steel bath surface is combusted and converted into CO2, and the heat of reaction at this time is used to efficiently raise the temperature of the molten steel 1, which also contributes to the removal of R. It is also desirable to promote the oxidation and to suppress the oxidation of valuable metals such as Cr.
（実施例）
この実施例では、炉体２内に２３ｔｏｎの溶鋼を入れ、
５ＵＳ３０４相当材の精錬を４段階で実施した。このと
き、精錬開始前の溶鋼中のＣ含有うｉ、が０．８Ｊｉ％
であるものを用い１羽口４の内管４ａより０２ガスを吹
き込むと同時に外’ｆ？４ｂよりＡｌガスを吹き込んで
溶鋼１を強制撹拌状態とし、燃焼バーナー（能力；重油
２２立／分）６から火炎７を噴射させて溶鋼１を加熱し
ながら精錬を実施した。(Example) In this example, 23 tons of molten steel was put into the furnace body 2,
Refining of material equivalent to 5US304 was carried out in four stages. At this time, the C content in the molten steel before the start of refining is 0.8Ji%
At the same time, 02 gas is blown into the inner pipe 4a of one tuyere 4 using a tuyere 4. The molten steel 1 was forcibly stirred by blowing Al gas through the molten steel 4b, and the molten steel 1 was heated while being heated by a flame 7 injected from the combustion burner (capacity: heavy oil 22 t/min) 6 to perform refining.
また、比較のために、従来のＡＯＤ精錬法に帛拠するも
のとして、精錬開始前の溶鋼中のＣ含有量が１．５重量
％であるものを用い１羽目（４）の内管（４ａ）より０
２ガスを吹き込むと同時に外管（４ｂ）よりＡｒガスを
吹き込んで溶鋼（１）を強制撹拌状７ｉ％とし、燃焼バ
ーナー（６）を用いずに精錬を実施した。In addition, for comparison, as a method based on the conventional AOD refining method, the inner tube (4a ) than 0
At the same time as the two gases were blown in, Ar gas was blown in through the outer pipe (4b) to make the molten steel (1) into a forcedly stirred state of 7i%, and refining was carried out without using the combustion burner (6).
このときの精錬パターンを第１表および第２図に示す、
また、精錬の第１．２段階における熱効率を第２表に示
す、なお、第２表において、有効８量の合計は、溶鋼昇
温＋合金溶融＋造滓剤溶融に要した総熱量である。また
、本発明実施例におけるＣｒ酸化量は時間短縮により比
較例におけるＣｒ酸化量の半分に抑制できた。さらに、
燃焼／ヘーナー６における着熱効率は４０％と推定した
。The refining pattern at this time is shown in Table 1 and Figure 2.
In addition, the thermal efficiency in the 1.2 stages of refining is shown in Table 2. In Table 2, the sum of the 8 effective amounts is the total amount of heat required for heating up the molten steel + melting the alloy + melting the slag forming agent. . Furthermore, the amount of Cr oxidation in the Examples of the present invention could be suppressed to half of the amount of Cr oxidation in the Comparative Examples by shortening the time. moreover,
The heat transfer efficiency in combustion/Hoehner 6 was estimated to be 40%.
第１表に示すように、本発明実施例においては、精錬中
における熱補償を燃焼バーナー６からの火炎７によって
行っているため、精錬前における溶鋼中のＣ含有量を従
来の１．５重量％から０．８重量％に低減することが可
能であることから、第１．２段階終了後の溶鋼中Ｃ含有
量を０．３重量％にするまでの脱炭時間を約７分程度短
縮することが可能であった。As shown in Table 1, in the embodiment of the present invention, heat compensation during refining is performed by the flame 7 from the combustion burner 6, so that the C content in the molten steel before refining is reduced to 1.5% by weight compared to the conventional one. % to 0.8% by weight, reducing the decarburization time by approximately 7 minutes to reduce the C content in molten steel to 0.3% by weight after the completion of stage 1.2. It was possible to do so.
また、第２図に示すように、本発明実施例においては溶
鋼中のＣｒ減緘が少ないため、すなわちＣｒの酸化量が
少ないため、その後のＣｒ；元に要する時間が第１表に
示すように約３分短縮で々た。In addition, as shown in FIG. 2, in the examples of the present invention, there is little Cr reduction in the molten steel, that is, the amount of oxidation of Cr is small, so the time required for subsequent Cr removal is as shown in Table 1. It was about 3 minutes shorter.
したがって、精錬の第１．２段階における上記脱炭時間
の短縮ならびにＣｒ酸化の抑制によって、ｒ＃火動物溶
損軽減とＳｉ原単位の低減を図ることが可能であり、燃
焼バーナー６による熱補償はＣｒ鉱石の有効利用にも結
びつくものであった。Therefore, by shortening the decarburization time and suppressing Cr oxidation in the 1.2 stage of refining, it is possible to reduce r# fire erosion and reduce the Si basic unit. This also led to the effective use of Cr ore.
また、上記のように本発明実施例では第２因に示すごと
＜Ｃｒの酸化Ｊ−が少ないため、その後のＣｒ ｍ元に
貧するＳｉ源の使用１止を比較例の場合に比べて約３．
５Ｋｇ／溶鋼ｔｏｎ低減することが＋＋ｆ能であり、第
１表に示すように除滓時間を約２分間ＩＵ ｌｉｆする
ことが可能であった。また、合計１２分間の時間短縮に
よりＳｔ原単位の低減と耐火物寿命の大幅な延長を実現
することが可能であった。In addition, as mentioned above, in the example of the present invention, as shown in the second factor, there is less oxidized J- of Cr, so that the subsequent use of the Si source, which is poor in Cr m source, can be stopped by about 30% compared to the comparative example. 3.
It was possible to reduce 5 kg/ton of molten steel by ++f, and as shown in Table 1, it was possible to reduce the slag removal time by about 2 minutes IU lif. In addition, by shortening the time by a total of 12 minutes, it was possible to reduce the St basic unit and significantly extend the life of the refractory.
［発明の効果］
以１−説明してきたように、本発明による鋼の精錬方法
では、炉内の溶鋼中に吹き込んだガスにより当該溶鋼を
強制攪拌しながら精錬を実施するに際し１重油、微粉炭
、天然ガスなどの燃料源を用いる燃焼バーナーにより、
前記強制撹拌によって受熱面積が拡大された鋼浴面に対
して熱の伝達・供給を行いつつ精錬を実施するようにし
１未発明方〃、を実施するための精錬装置では、溶鋼を
収容する炉体と、炉内の溶鋼中にガスを吹き込んで当該
溶鋼を強制撹拌するガス送給手段と、前記強制撹拌によ
って受熱面積が拡大された鋼浴面に対して熱の伝達・供
給を行う燃焼バーナーと、前記燃焼バーナーに燃料源を
供給する燃料源供給手段と、前記燃焼バーナーに０２源
を供給する０２源供給手段と、排ガス中のＣＯ量を測定
するＣＯ量計測手段と、を備えた構成としたから、鋼の
精錬に際して従来のように精錬前における溶鋼中のＣ含
有量を当該Ｃによる熱補償が十分得られるように１．５
〜２．０重量％程度にコントロールする必要がなく、燃
焼バーナーによる熱補償を行うようにしているため、精
錬前における溶鋼中のＣ含有量を従来よりもさらに低く
しておくこともできるので、脱炭時間を短縮することが
可能であり。[Effects of the Invention] As described in 1-1 above, in the steel refining method according to the present invention, when refining is carried out while the molten steel is forcibly stirred by gas blown into the molten steel in the furnace, heavy oil, pulverized coal, etc. , with a combustion burner using a fuel source such as natural gas.
A refining apparatus for carrying out 1 uninvented method, in which refining is carried out while transmitting and supplying heat to the steel bath surface whose heat receiving area has been expanded by the forced stirring, includes a furnace for storing molten steel. a gas supply means for forcibly stirring the molten steel by blowing gas into the molten steel in the furnace; and a combustion burner for transmitting and supplying heat to the steel bath surface whose heat receiving area has been expanded by the forced stirring. and a fuel source supply means for supplying a fuel source to the combustion burner, an 02 source supply means for supplying an 02 source to the combustion burner, and a CO amount measuring means for measuring the amount of CO in exhaust gas. Therefore, when refining steel, the C content in molten steel before refining is set to 1.5 to ensure sufficient thermal compensation by the C.
Since there is no need to control the C content to around 2.0% by weight and the combustion burner performs heat compensation, the C content in the molten steel before refining can be lowered even lower than before. It is possible to shorten decarburization time.
この時間短縮によってＣｒ等の有価全屈の酸化量を低減
し、当該有価金属の酸化損失を少なくすると共に、当該
有価金属の再還元のための還元剤の添加量の低減ならび
に還元時間の短縮を図ることが可能であり、還元剤使用
量が低減することによってスラグの生成量も少なくなり
、除滓時間の短縮を実現することが呼能であるなどの非
常に優れた効果がもたらされる。By shortening this time, the amount of total oxidation of valuable metals such as Cr is reduced, reducing the oxidation loss of the valuable metals, as well as reducing the amount of reducing agent added for re-reduction of the valuable metals and shortening the reduction time. By reducing the amount of reducing agent used, the amount of slag produced also decreases, and very excellent effects such as reduction in slag removal time are achieved.
第１図は本発明の一実施態様において使用される銅の精
錬装置の縦断面説明図、第２図は本発明実施例および比
較例における精錬過程での溶鋼中［Ｃｒｌ：ｄおよび［
Ｃ］量ならびに溶鋼温度の変化を示すグラフである。
１・・・溶鋼、
２・・・炉体、
３・・・炉蓋。
４・・・羽目（ガス送給手段）。
５・・・出鋼口。
６・・・燃焼バーナー。
７・・・火炎、
１１・・・燃滓：１源供給配管（燃料源供給手段）。
２１・・・０２源供給配管（０２［供給手段）。
２６−Ｃ０／Ｃｏ２メーター （ＣＯｆｆｉ計測手段）
。
特許出願人 大同特殊鋼株式会社
代理人弁理士 小 塩 ０
第１因FIG. 1 is an explanatory longitudinal cross-sectional view of a copper refining apparatus used in an embodiment of the present invention, and FIG. 2 is a diagram showing molten steel [Crl:d and [Crl:d and [
C] is a graph showing changes in amount and molten steel temperature. 1... Molten steel, 2... Furnace body, 3... Furnace cover. 4... Window (gas supply means). 5... Steel tapping port. 6... Combustion burner. 7... Flame, 11... Combustion slag: 1 source supply piping (fuel source supply means). 21...02 source supply piping (02 [supply means). 26-C0/Co2 meter (Coffi measurement means)
. Patent Applicant Daido Steel Co., Ltd. Representative Patent Attorney Shio O 0 1st cause
Claims (9)
強制攪拌しながら精錬を実施するに際し、重油、微粉炭
、天然ガスなどの燃料源を用いる燃焼バーナーにより、
前記強制攪拌によって受熱面積が拡大された鋼浴面に対
して熱の伝達・供給を行いつつ精錬を実施することを特
徴とする鋼の精錬方法。(1) When performing refining while forcibly stirring the molten steel with gas blown into the molten steel in the furnace, a combustion burner using fuel sources such as heavy oil, pulverized coal, and natural gas is used to
A method for refining steel, characterized in that refining is carried out while transmitting and supplying heat to a steel bath surface whose heat receiving area has been expanded by the forced stirring.
ある特許請求の範囲第（１）項に記載の鋼の精錬方法。(2) The steel refining method according to claim (1), wherein the gas blown into the molten steel in the furnace is an oxidizing gas.
ある特許請求の範囲第（１）項または第（２）項に記載
の鋼の精錬方法。(3) The steel refining method according to claim (1) or (2), wherein the gas blown into the molten steel in the furnace is an inert gas.
０体積％以上のＯ＿２を含む酸素富化混合ガスを使用し
て高温の火炎を得るようにした特許請求の範囲第（１）
項ないし第（３）項のいずれかに記載の鋼の精錬方法。(4) As the oxidizing gas supplied to the combustion burner, 3
Claim No. 1, in which a high-temperature flame is obtained using an oxygen-enriched mixed gas containing 0% by volume or more of O_2
The method for refining steel according to any one of paragraphs to (3).
うように設定される特許請求の範囲第（１）項ないし第
（４）項のいずれかに記載の鋼の精錬方法。(5) The steel refining method according to any one of claims (1) to (4), wherein the flame from the combustion burner is set to be directed toward the steel bath surface.
量領域においては、燃料源に対する理論酸素要求量より
も多くのＯ＿２源を供給するようにした特許請求の範囲
第（１）項ないし第（５）項のいずれかに記載の鋼の精
錬方法。(6) In the C content region of molten steel where the decarburization reaction is O_2 supply rate-determining, the O_2 source is supplied in an amount larger than the theoretical oxygen demand for the fuel source. The method for refining steel according to any one of items 1 to 5.
行うようにした特許請求の範囲第（６）項に記載の鋼の
精錬方法。(7) The steel refining method according to claim (6), wherein the O_2 source is supplied from a combustion burner onto the surface of the steel bath.
上に行うようにした特許請求の範囲第（６）項に記載の
鋼の精錬方法。(8) The steel refining method according to claim (6), wherein the O_2 source is supplied onto the steel bath surface separately from the combustion burner.
き込んで当該溶鋼を強制攪拌するガス送給手段と、前記
強制攪拌によって受熱面積が拡大された鋼浴面に対して
熱の伝達・供給を行う燃焼バーナーと、前記燃焼バーナ
ーに燃料源を供給する燃料源供給手段と、前記燃焼バー
ナーにＯ＿２源を供給するＯ＿２源供給手段と、排ガス
中のＣＯ量を測定するＣＯ量計測手段と、を備えたこと
を特徴とする鋼の精錬装置。(9) A furnace body that accommodates molten steel, a gas supply means that forcibly stirs the molten steel by blowing gas into the molten steel in the furnace, and a steel bath surface whose heat receiving area has been expanded by the forced stirring. a combustion burner for transmitting and supplying CO, a fuel source supply means for supplying a fuel source to the combustion burner, an O_2 source supply means for supplying an O_2 source to the combustion burner, and a CO amount for measuring the amount of CO in exhaust gas. A steel refining device characterized by comprising a measuring means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61292593A JP2512919B2 (en) | 1986-12-10 | 1986-12-10 | Refining method for stainless steel with less oxidation of valuable metals such as Cr during decarburization of molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61292593A JP2512919B2 (en) | 1986-12-10 | 1986-12-10 | Refining method for stainless steel with less oxidation of valuable metals such as Cr during decarburization of molten steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63145709A true JPS63145709A (en) | 1988-06-17 |
| JP2512919B2 JP2512919B2 (en) | 1996-07-03 |
Family
ID=17783787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61292593A Expired - Lifetime JP2512919B2 (en) | 1986-12-10 | 1986-12-10 | Refining method for stainless steel with less oxidation of valuable metals such as Cr during decarburization of molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2512919B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013209678A (en) * | 2012-03-30 | 2013-10-10 | Jfe Steel Corp | Method of manufacturing molten steel |
-
1986
- 1986-12-10 JP JP61292593A patent/JP2512919B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013209678A (en) * | 2012-03-30 | 2013-10-10 | Jfe Steel Corp | Method of manufacturing molten steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2512919B2 (en) | 1996-07-03 |
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