JP2723161B2 - Atmosphere control method for vertical induction heating furnace - Google Patents
Atmosphere control method for vertical induction heating furnaceInfo
- Publication number
- JP2723161B2 JP2723161B2 JP5011349A JP1134993A JP2723161B2 JP 2723161 B2 JP2723161 B2 JP 2723161B2 JP 5011349 A JP5011349 A JP 5011349A JP 1134993 A JP1134993 A JP 1134993A JP 2723161 B2 JP2723161 B2 JP 2723161B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- atmosphere
- inert gas
- induction heating
- furnace body
- 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 - Fee Related
Links
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
- Y02P10/25—Process efficiency
Description
【０００１】[0001]
【産業上の利用分野】本発明は、スラブ等の被加熱材を
誘導加熱する際における誘導加熱炉の炉内雰囲気を制御
する方法に関するもので、さらに詳述すれば、誘導加熱
炉への不活性ガスの吹き込みにより一定酸素濃度以下に
された炉内雰囲気を保持することを目的とした誘導加熱
炉の炉内雰囲気制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an atmosphere in an induction heating furnace when an object to be heated such as a slab is induction-heated. The present invention relates to a furnace atmosphere control method of an induction heating furnace for maintaining a furnace atmosphere having a certain oxygen concentration or less by blowing active gas.
【０００２】[0002]
【従来の技術】スラブを下部装入式の竪型誘導加熱炉に
おいて高温に加熱する場合、炉内に不活性ガスを吹き込
む等して炉内雰囲気制御を行い、もってスケールの発生
を減少させる技術が従来から知られている。一般的な方
法としては、特開昭64−62411 号公報に開示された従来
技術があり、これは密封式の竪型誘導加熱炉によりスラ
ブを加熱するに際して、炉内に炉体下部から不活性ガス
を吹き込みながら炉内の雰囲気を炉体上部から放散さ
せ、炉内の酸素濃度を目標値にまで低下させたのち、炉
内雰囲気の炉体上部からの放散を遮断した状態で、炉内
に炉体上部から不活性ガスを吹き込み、炉内の酸素濃度
を制御する方法である。2. Description of the Related Art When a slab is heated to a high temperature in a vertical induction heating furnace equipped with a lower part, the atmosphere in the furnace is controlled by blowing an inert gas into the furnace, thereby reducing the generation of scale. Is conventionally known. As a general method, there is a conventional technique disclosed in JP-A-64-62411. When a slab is heated by a sealed vertical induction heating furnace, the slab is inerted into the furnace from below the furnace body. The atmosphere in the furnace was diffused from the upper part of the furnace while blowing gas, and the oxygen concentration in the furnace was reduced to the target value. In this method, an inert gas is blown from the upper part of the furnace body to control the oxygen concentration in the furnace.
【０００３】また、前記の炉内の雰囲気を炉体外に放散
する速度を速くする方法として、特開昭61−34883 号公
報に開示されているように炉内ガスを吸引排出する装置
を設置して、吸引装置による炉内ガス吸引排出後に、不
活性ガスを前記炉内に供給することにより、炉内の酸素
濃度を予め設定された一定値以下に保持する方法もあ
る。As a method for increasing the speed of dissipating the atmosphere in the furnace to the outside of the furnace, a device for sucking and discharging the gas in the furnace is installed as disclosed in Japanese Patent Application Laid-Open No. 61-34883. There is also a method in which an inert gas is supplied into the furnace after the furnace gas is sucked and discharged by the suction device, thereby keeping the oxygen concentration in the furnace at a predetermined constant value or less.
【０００４】[0004]
【発明が解決しようとする課題】ところで、一般にこの
種の密封式の竪型誘導加熱炉の密封を完全なものにする
ことは、極めて困難であり、例えば、誘導加熱の特性上
の問題として、被加熱材を加熱する加熱部の炉壁は、鋼
製構造ではなく、耐熱れんが、セラミックファイバ等の
断熱材により構成されるのが一般であり、通気性を完全
に遮断することは不可能である。In general, it is extremely difficult to completely seal a sealed-type vertical induction heating furnace of this kind. For example, problems with the characteristics of induction heating include: The furnace wall of the heating section that heats the material to be heated is not made of steel, but is generally made of a heat-resistant brick, or a heat insulating material such as ceramic fiber, and it is impossible to completely block air permeability. is there.
【０００５】このため、従来技術のうち、後者について
は、加熱当初の炉内ガスの急速パージのため、吸引排出
する方法であるが、この方法では、吸引排出すること
で、炉内圧力が負圧となり、前記炉壁部あるいは、他の
シール部から外気を吹き込むことになり、炉内酸素濃度
を十分に低下させることができない。また、この種の竪
型誘導加熱炉では、炉内温度が炉外温度よりもかなり高
いレベルにあることから、炉内ガスがドラフト効果によ
り、炉内において上昇方向の流れとなり、炉内下部から
上部の高さ方向で炉内圧力に差が生ずる。このため、前
記の炉体の密封性を完全に確保することが困難であるこ
とと考え合わせると前記特開昭64−62441 号公報に示さ
れているように炉内下部の炉圧が正圧であることが、炉
内酸素濃度を低い状態に保つための必要条件となる。For this reason, of the prior art, the latter is a method of sucking and discharging the gas in the furnace for rapid purging of the gas in the furnace at the beginning of heating. In this method, the pressure in the furnace is reduced by suction and discharging. As a result, the outside air is blown from the furnace wall portion or another seal portion, and the oxygen concentration in the furnace cannot be sufficiently reduced. Also, in this type of vertical induction heating furnace, since the temperature inside the furnace is at a considerably higher level than the temperature outside the furnace, the gas inside the furnace flows upward in the furnace due to the draft effect, and from the lower part of the furnace. There is a difference in furnace pressure in the height direction of the upper part. For this reason, considering that it is difficult to completely secure the hermeticity of the furnace body, when the furnace pressure in the lower part of the furnace is positive pressure as disclosed in Japanese Patent Application Laid-Open No. 64-62441. Is a necessary condition for keeping the oxygen concentration in the furnace low.
【０００６】ところが、従来技術のうち前者の方法で
は、加熱当初における炉体内ガスのパージ後は、炉体上
部から不活性ガスを吹き込み制御することとなっている
が、この方法では、一定量の不活性ガスを投入した場合
炉体上部の炉圧向上には効果が大きいが炉体下部の炉圧
向上に対しては、あまり効果が得られない。さらに、炉
体上部から不活性ガスを吹き込んだ場合、炉体上部に装
入された被加熱材に低温の前記不活性ガスが接触するこ
とになり、加熱上好ましくないので不活性ガス量を制限
することが必要となり、炉内酸素濃度を低くするのを妨
げていた。However, in the former method of the prior art, after purging the furnace gas at the beginning of heating, an inert gas is blown in from the upper part of the furnace body to control it. When an inert gas is introduced, the effect of increasing the furnace pressure in the upper part of the furnace body is great, but the effect of increasing the furnace pressure in the lower part of the furnace body is not so much obtained. Furthermore, when the inert gas is blown from the upper part of the furnace body, the low-temperature inert gas comes into contact with the material to be heated placed in the upper part of the furnace body, which is not preferable for heating, so that the amount of the inert gas is limited. To prevent the oxygen concentration in the furnace from being lowered.
【０００７】本発明は、前記従来技術の問題点を解消
し、被加熱材を加熱することへの影響が少なく、適正な
不活性ガスの投入量により炉体内を低酸素濃度雰囲気に
保持することができる竪型誘導加熱炉の炉内雰囲気制御
方法を提供することを目的とするものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, has a small influence on heating a material to be heated, and maintains the inside of a furnace at a low oxygen concentration atmosphere by a proper amount of inert gas. It is an object of the present invention to provide a method for controlling the atmosphere in a vertical induction heating furnace capable of performing the following.
【０００８】[0008]
【課題を解決するための手段】前記目的を達成するため
の本発明は、竪型誘導加熱炉内に装入した被加熱材を誘
導加熱するに際し、先ず、炉体下部から炉内に不活性ガ
スを吹き込みながら炉内雰囲気を炉体上部から放散させ
ることにより炉内雰囲気の酸素濃度を目標値に到達する
まで低下させ、次いで、前記炉内雰囲気の炉体上部から
の放散を遮断した状態として炉内雰囲気の酸素濃度を前
記目標値から上昇しないように不活性ガスを炉内に吹き
込む竪型誘導加熱炉の炉内雰囲気制御方法において、炉
体上部から炉内雰囲気の放散を遮断した状態での炉内へ
の不活性ガス吹き込みは、炉体の下部開口部を支持する
支持架台下部の炉体部シールと断接自在なノロ受けの下
部から吹き込むものであり、かつ、ノロ受け部分におけ
る雰囲気圧力を正圧に保持できる不活性ガス量に制御さ
れていることを特徴とする竪型誘導加熱炉の炉内雰囲気
制御方法である。According to the present invention, in order to achieve the above-mentioned object, when a material to be heated placed in a vertical induction heating furnace is induction-heated, first, an inert gas is introduced into the furnace from the lower part of the furnace body. By lowering the oxygen concentration of the furnace atmosphere to reach a target value by dispersing the furnace atmosphere from the upper part of the furnace while blowing gas, then, in a state in which the diffusion of the furnace atmosphere from the upper part of the furnace body is cut off In the furnace atmosphere control method of a vertical induction heating furnace in which an inert gas is blown into the furnace so that the oxygen concentration of the furnace atmosphere does not rise from the target value, in a state in which the diffusion of the furnace atmosphere is cut off from the upper part of the furnace body. The inert gas is blown into the furnace from the lower part of the rotatable receiver that can be freely connected to and disconnected from the furnace body seal at the lower part of the support base that supports the lower opening of the furnace body. Positive pressure It is furnace atmosphere control method of the vertical induction furnace, characterized in that the control of the amount of inert gas can be held in.
【０００９】[0009]
【作用】本発明によれば、炉体下部から不活性ガスを吹
き込みながら炉内雰囲気を炉体上部から外部に放散さ
せ、迅速かつ効率的に炉内雰囲気を置換して炉内の酸素
濃度を目標値まで低下到達させた後、炉体の下部開口部
を支持する支持架台下部の炉体部シールと断接自在なノ
ロ受けの下部から不活性ガスを、ノロ受け部分における
雰囲気圧力を正圧に保持できるガス量に制御して吹き込
むので、炉内ガスのドラフト作用により低炉圧となり易
い炉体下部の圧力保持に効果的であり、外気の吸い込み
が防止できる。According to the present invention, the atmosphere in the furnace is diffused from the upper part of the furnace to the outside while blowing the inert gas from the lower part of the furnace body, and the atmosphere in the furnace is quickly and efficiently replaced to reduce the oxygen concentration in the furnace. After reaching the target value, the inert gas is applied from the lower part of the rotatable receiver that can be freely connected to the furnace body seal at the lower part of the support base that supports the lower opening of the furnace body, and the atmospheric pressure at the noro receiving part is positive pressure. Since the gas is blown in a controlled manner at a gas amount that can be held in the furnace, it is effective to hold the pressure at the lower part of the furnace body where the furnace pressure tends to be low due to the draft action of the gas in the furnace, and it is possible to prevent the suction of outside air.
【００１０】また、吹き込まれた炉内ガスは、ドラフト
作用によって炉体内を上昇中に加熱された状態で被加熱
材と接触するため、従来の方法で問題となっていた、不
活性ガス吹き込み部付近の被加熱材の局部的な温度低下
を防止することができる。Further, since the blown gas in the furnace comes into contact with the material to be heated in a state where the gas is heated while ascending in the furnace by the draft action, the inert gas blowing portion, which has been a problem in the conventional method, is used. It is possible to prevent a local temperature decrease of the material to be heated nearby.
【００１１】[0011]
【実施例】図１は、本発明方法を実施すべく構成した竪
型誘導加熱炉の構成例を示すもので、炉体２は、通常、
断熱レンガ、セラミックファイバ等を用いて有頂筒形状
に成形され、この炉体２の側壁外周面に複数（図示実施
例の場合、４組）のブロックに分割された誘導加熱コイ
ル３を組付けている。FIG. 1 shows an example of the configuration of a vertical induction heating furnace configured to carry out the method of the present invention.
The induction heating coil 3 which is formed into a topped cylindrical shape using a heat insulating brick, ceramic fiber, or the like and is divided into a plurality of (four in the illustrated embodiment) blocks is attached to the outer peripheral surface of the side wall of the furnace body 2. ing.
【００１２】スラブ等の被加熱材１は、炉床４に載荷保
持された状態で、昇降ビーム５を昇降装置（図示せず）
を用いて昇降することにより、炉内への装入、抽出が行
われる。この昇降ビーム５の廻りには、加熱中に発生し
た溶融スケール（ノロ）が落下してくるのを回収するた
めのノロ受け６が設置されている。また下方に開放され
た炉体２の下端開口部は、支持架台８に支持されてお
り、この支持架台８下部の炉体下部シール７に断接自在
なノロ受け６の上端部を挿入したり離脱することにより
開閉されるようになっている。A material 1 to be heated such as a slab is loaded and held on a hearth 4 and a lifting beam 5 is lifted by a lifting device (not shown).
By ascending and descending using, charging and extraction into the furnace are performed. Around the elevating beam 5, a spar receiver 6 for collecting the molten scale (slough) generated during the heating is installed. The lower end opening of the furnace body 2 which is opened downward is supported by a support base 8, and the upper end of a rotatable holder 6 that can be freely connected and disconnected to a furnace body lower seal 7 below the support base 8 is inserted. It is designed to be opened and closed by leaving.
【００１３】ノロ受け６の下部には、炉体２内に窒素ガ
ス等の不活性ガス吹き込み口11が形成されていると共
に、ノロ受け６の下部の炉内雰囲気酸素濃度を測定する
炉下部酸素濃度測定口12および炉内雰囲気圧力を測定す
る炉下部圧力測定口13が設けてある。さらに炉体２の炉
頂部にも、同様に炉上部酸素濃度測定口14および炉上部
圧力測定口15が設けてある。また炉頂部の天井には放散
口16が開口形成され、この放散口16はシリンダ10の伸縮
作用により放散用蓋９により開閉制御される。An inert gas injection port 11 such as nitrogen gas is formed in the furnace body 2 at a lower portion of the noro holder 6 and a furnace lower oxygen for measuring a furnace atmosphere oxygen concentration below the noro holder 6 is provided. A concentration measuring port 12 and a furnace lower pressure measuring port 13 for measuring a furnace atmosphere pressure are provided. Further, a furnace upper oxygen concentration measuring port 14 and a furnace upper pressure measuring port 15 are similarly provided at the furnace top of the furnace body 2. A radiation port 16 is formed in the ceiling of the furnace top, and the radiation port 16 is controlled to be opened and closed by the radiation lid 9 by the expansion and contraction of the cylinder 10.
【００１４】竪型誘導加熱炉を用いて被加熱材１を誘導
加熱するに際し、先ず、ノロ受け６下部に設けた不活性
ガス吹き込み口11から大量の不活性ガスを炉体２内に吹
き込み、炉下部酸素濃度測定口12および炉上部酸素濃度
測定口14から採取した雰囲気ガスを酸素濃度計で測定
し、この測定値が目標値に達するまで大量の不活性ガス
の吹き込みを継続する。そして炉内雰囲気の酸素濃度が
目標値に達するまで低下したらシリンダ10を作動して放
散用蓋９により放散口16を閉状態として炉体２の内部を
密閉状態にする。When the material 1 to be heated is induction-heated using a vertical induction heating furnace, first, a large amount of inert gas is blown into the furnace body 2 from an inert gas blowing port 11 provided at a lower portion of the noro receiver 6. Atmosphere gases collected from the lower oxygen concentration measuring port 12 and the upper oxygen concentration measuring port 14 of the furnace are measured by an oximeter, and a large amount of inert gas is continuously blown until the measured value reaches a target value. Then, when the oxygen concentration in the furnace atmosphere decreases to reach the target value, the cylinder 10 is operated to close the emission port 16 with the emission lid 9 and the interior of the furnace body 2 is sealed.
【００１５】しかしながら、この種の炉体２における密
閉状態の保持は困難であり、必ずある程度の内部雰囲気
の放逸は避けられないので、この放逸する不活性ガスを
補い、かつ外気が炉体２内に侵入しないように必要量の
不活性ガスを炉体２内に吹き込み続ける。この際の吹き
込み量の設定としては、炉体２内への外気の侵入を防止
することが目的であるので、炉体２内の圧力が負圧にな
らないように炉下部圧力測定口13および炉上部圧力測定
口15にそれぞれ設けた圧力計により炉体２内の圧力を監
視し、圧力が負圧とならないように炉体２内に不活性ガ
スを供給する。However, it is difficult to maintain a sealed state in this kind of furnace body 2 and it is inevitable that a certain amount of internal atmosphere is evacuated. The required amount of inert gas is continuously blown into the furnace body 2 so as not to enter the furnace 2. Since the purpose of setting the blowing amount at this time is to prevent outside air from entering the furnace body 2, the furnace lower pressure measurement port 13 and the furnace The pressure inside the furnace body 2 is monitored by a pressure gauge provided at each of the upper pressure measurement ports 15, and an inert gas is supplied into the furnace body 2 so that the pressure does not become negative.
【００１６】この場合、負圧の発生は、炉体２下部に生
じるので、ノロ受け６下部の不活性ガス吹き込み口11を
介して炉内に不活性ガスの吹き込みを行い、炉下部圧力
測定口13で測定した圧力を常に正圧に保持するように吹
き込み量を制御する。これによって炉体２下部における
炉内雰囲気圧への応答性効果を高めるとともに、炉内ガ
スのドラフト作用で炉内雰囲気ガスを押し上げる方向に
作用させることにより、被加熱材１に低温の不活性ガス
が接触することを防止する。なお、炉体２内への不活性
ガス吹き込みに際しては、炉体２内の酸素濃度を常時測
定し、この酸素濃度が目標値を保つような不活性ガスの
炉体内への供給が必要であり、酸素濃度の測定は下部、
上部酸素濃度測定口12、14を用いて行う。In this case, since a negative pressure is generated in the lower part of the furnace body 2, an inert gas is blown into the furnace through an inert gas blowing port 11 in a lower part of the noro receiver 6, and a pressure measurement port in the lower part of the furnace is provided. The blowing amount is controlled so that the pressure measured in step 13 is always maintained at a positive pressure. This enhances the effect of responsiveness to the furnace atmosphere pressure in the lower part of the furnace body 2 and acts to push up the furnace atmosphere gas by a draft action of the furnace gas, so that a low-temperature inert gas is applied to the material 1 to be heated. To prevent contact. When blowing the inert gas into the furnace body 2, it is necessary to constantly measure the oxygen concentration in the furnace body 2 and supply the inert gas into the furnace body such that the oxygen concentration maintains a target value. , Oxygen concentration measurement at the bottom,
The measurement is performed using the upper oxygen concentration measurement ports 12 and 14.
【００１７】次に本発明方法の操業結果について説明す
る。被加熱材であるスラブを通常加熱炉で平均温度1200
℃まで加熱した後、図１の誘導加熱炉で窒素ガスによる
パージを行いながら加熱を行った。スラブ装入後、放散
口16を開状態として、ノロ受け６の下部に設けた不活性
ガス吹き込み口11（８ヶ所）から1500Nm3 ／Hrでパージ
したところ約２分で目標の500ppmまで炉体２内の酸素ガ
ス濃度が下がった。Next, the operation results of the method of the present invention will be described. The slab to be heated is heated in an ordinary heating furnace at an average temperature of 1200.
After heating to ° C., heating was performed while purging with nitrogen gas in the induction heating furnace of FIG. After charging the slab, the discharge port 16 was opened and purged from the inert gas injection ports 11 (8 locations) provided at the lower part of the noro holder 6 at 1500 Nm 3 / Hr. The furnace body reached the target 500 ppm in about 2 minutes. The oxygen gas concentration in 2 fell.
【００１８】その後、放散口16を閉状態として、上部の
炉体２内の酸素濃度が目標値500ppmを保持するように流
量制御しながら窒素ガスをノロ受け６下部の不活性ガス
吹き込み口11を介して炉体２内に吹き込んだところ、図
２に示すように炉体内の酸素濃度 500±30ppm 、窒素ガ
ス流量 400±50Nm3 ／Hrで安定して保持できた。また、
炉体２内での高さ方向の炉圧分布を調査した結果を図３
に示した。図３の（ａ）、（ｂ）とも、吹き込み窒素ガ
ス流量 400Nm3 ／Hrのデータであるが、（ａ）は従来方
法として、窒素ガスを上部から吹き込んだ場合であり、
（ｂ）は本発明の方法として、窒素ガスをノロ受け６の
下部から吹き込んだ場合であり、（ａ）では、炉頂部の
圧力は高いが炉底部で若干の負圧になっているが、
（ｂ）では、炉底部も正圧となっているため、炉体内へ
の外気の侵入が防止できている。Thereafter, the discharge port 16 is closed, and while the flow rate is controlled so that the oxygen concentration in the upper furnace body 2 maintains a target value of 500 ppm, the nitrogen gas is received and the inert gas injection port 11 at the lower part of the furnace 6 is closed. When it was blown into the furnace body 2 through the furnace, as shown in FIG. 2, it was possible to stably maintain the furnace body with an oxygen concentration of 500 ± 30 ppm and a nitrogen gas flow rate of 400 ± 50 Nm 3 / Hr. Also,
Fig. 3 shows the results of investigation of the furnace pressure distribution in the height direction inside the furnace body 2.
It was shown to. FIGS. 3A and 3B both show data of a nitrogen gas flow rate of 400 Nm 3 / Hr. FIG. 3A shows a case where nitrogen gas is blown from above as a conventional method.
(B) shows a method of the present invention in which nitrogen gas is blown from the lower part of the slag receiver 6. In (a), the pressure at the furnace top is high but a slight negative pressure is at the furnace bottom.
In (b), since the furnace bottom is also at a positive pressure, invasion of outside air into the furnace body can be prevented.
【００１９】[0019]
【発明の効果】本発明によれば、炉体内雰囲気の自然対
流現象と不活性ガスの炉体内への吹き込み動作とを利用
して炉体内雰囲気の不活性ガスとの置換を行った後の炉
体内雰囲気の維持を、不活性ガスの継続した吹き込みを
適正な位置からの供給により実現し、しかも吹き込まれ
た不活性ガスが低温の状態で被加熱材に接することを防
止できる。According to the present invention, the furnace after the replacement of the atmosphere in the furnace with the inert gas by utilizing the natural convection phenomenon of the atmosphere inside the furnace and the operation of blowing the inert gas into the furnace. It is possible to maintain the internal atmosphere by continuously blowing the inert gas from a proper position and to prevent the blown inert gas from contacting the material to be heated at a low temperature.
【図１】本発明の実施例の構成を示す断面図である。FIG. 1 is a sectional view showing a configuration of an embodiment of the present invention.
【図２】本発明のＮ2 ガス吹き込み量と炉内Ｏ2 濃度の
推移を示す線図である。FIG. 2 is a diagram showing the transition of the N 2 gas blowing amount and the O 2 concentration in the furnace according to the present invention.
【図３】炉底部からの高さと炉圧分布との関係を本発明
と従来とについて比較して示す線図である。FIG. 3 is a diagram showing a relationship between a height from a furnace bottom and a furnace pressure distribution in comparison between the present invention and a conventional example.
１ 被加熱材 ２ 炉体 ３ 誘導加熱コイル ４ 炉床 ５ 昇降ビーム ６ ノロ受け ７ 炉体下部シール ８ 支持架台 ９ 放散用蓋 10 シリンダ 11 不活性ガス吹き込み口 12 炉下部酸素濃度測定口 13 炉下部圧力測定口 14 炉上部酸素濃度測定口 15 炉上部圧力測定口 16 放散口 DESCRIPTION OF SYMBOLS 1 Heated material 2 Furnace body 3 Induction heating coil 4 Hearth 5 Elevating beam 6 Scraper 7 Furnace lower seal 8 Supporting stand 9 Dispersion lid 10 Cylinder 11 Inert gas blowing port 12 Furnace lower oxygen concentration measurement port 13 Lower furnace Pressure measurement port 14 Furnace upper oxygen concentration measurement port 15 Furnace upper pressure measurement port 16 Discharge port
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭64−62411（ＪＰ，Ａ) 特開 平１−136928（ＪＰ，Ａ) 特開 平２−11717（ＪＰ，Ａ) ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-64-62411 (JP, A) JP-A-1-136928 (JP, A) JP-A-2-11717 (JP, A)
Claims (1)
誘導加熱するに際し、先ず、炉体下部から炉内に不活性
ガスを吹き込みながら炉内雰囲気を炉体上部から放散さ
せることにより炉内雰囲気の酸素濃度を目標値に到達す
るまで低下させ、次いで、前記炉内雰囲気の炉体上部か
らの放散を遮断した状態として炉内雰囲気の酸素濃度を
前記目標値から上昇しないように不活性ガスを炉内に吹
き込む竪型誘導加熱炉の炉内雰囲気制御方法において、
炉体上部から炉内雰囲気の放散を遮断した状態での炉内
への不活性ガス吹き込みは、炉体の下部開口部を支持す
る支持架台下部の炉体部シールと断接自在なノロ受けの
下部から吹き込むものであり、かつ、ノロ受け部分にお
ける雰囲気圧力を正圧に保持できる不活性ガス量に制御
されていることを特徴とする竪型誘導加熱炉の炉内雰囲
気制御方法。When heating an object to be heated charged in a vertical induction heating furnace, first, an atmosphere in the furnace is diffused from an upper part of the furnace body while blowing an inert gas into the furnace from a lower part of the furnace body. The oxygen concentration of the furnace atmosphere is reduced until it reaches a target value, and then the oxygen concentration of the furnace atmosphere is prevented from rising from the target value in a state where the diffusion of the furnace atmosphere from the upper part of the furnace body is shut off. In a furnace atmosphere control method of a vertical induction heating furnace in which an inert gas is blown into the furnace,
The inert gas is blown into the furnace in a state where the atmosphere inside the furnace is prevented from being diffused from the upper part of the furnace body. A method for controlling the atmosphere in a furnace of a vertical induction heating furnace, wherein the atmosphere is blown from a lower portion and the amount of inert gas in the slag receiving portion is controlled to an inert gas amount capable of maintaining a positive pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5011349A JP2723161B2 (en) | 1993-01-27 | 1993-01-27 | Atmosphere control method for vertical induction heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5011349A JP2723161B2 (en) | 1993-01-27 | 1993-01-27 | Atmosphere control method for vertical induction heating furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06220530A JPH06220530A (en) | 1994-08-09 |
| JP2723161B2 true JP2723161B2 (en) | 1998-03-09 |
Family
ID=11775568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5011349A Expired - Fee Related JP2723161B2 (en) | 1993-01-27 | 1993-01-27 | Atmosphere control method for vertical induction heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2723161B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5481778B2 (en) * | 2007-06-14 | 2014-04-23 | 株式会社豊田中央研究所 | Metal melt preparation device, metal melt preparation method, metal melt degassing or non-metal inclusion removal device, metal melt manufacturing method, and metal melt degassing or non-metal inclusion removal method |
| CN107955877B (en) * | 2017-11-27 | 2020-01-03 | 山东钢铁股份有限公司 | Control method for ultra-low oxygen content in roller hearth heat treatment furnace |
| JP7067171B2 (en) * | 2018-03-22 | 2022-05-16 | 日本電気株式会社 | Manufacturing equipment and control method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6462411A (en) * | 1987-08-31 | 1989-03-08 | Kawasaki Steel Co | Method for controlling atmosphere in induction heating furnace |
| JPH0730390B2 (en) * | 1987-11-20 | 1995-04-05 | 川崎製鉄株式会社 | Vertical induction heating device |
| JPH066734B2 (en) * | 1988-06-30 | 1994-01-26 | 川崎製鉄株式会社 | Induction heating device temperature control method and device |
-
1993
- 1993-01-27 JP JP5011349A patent/JP2723161B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06220530A (en) | 1994-08-09 |
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