JPH0479742B2 - - Google Patents
Info
- Publication number
- JPH0479742B2 JPH0479742B2 JP852085A JP852085A JPH0479742B2 JP H0479742 B2 JPH0479742 B2 JP H0479742B2 JP 852085 A JP852085 A JP 852085A JP 852085 A JP852085 A JP 852085A JP H0479742 B2 JPH0479742 B2 JP H0479742B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- molten metal
- electrodes
- phase current
- contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000007654 immersion Methods 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 10
- 239000011819 refractory material Substances 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 239000004020 conductor Substances 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 238000005266 casting Methods 0.000 description 6
- 238000009749 continuous casting Methods 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 230000005611 electricity Effects 0.000 description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/60—Pouring-nozzles with heating or cooling means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Resistance Heating (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Furnace Details (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は電気伝導性を有する炭素含有耐火物自
体に電流を供給し、抵抗熱（ジユール熱）による
発熱を利用して該耐火物を加熱する耐火物の通電
加熱方法に関するものであり、溶融金属の流通管
耐火壁の加熱に用いるものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention supplies an electric current to the carbon-containing refractory itself having electrical conductivity, and heats the refractory using heat generated by resistance heat (Jule heat). The present invention relates to a method of electrically heating refractories, and is used to heat a refractory wall of a molten metal flow pipe.
例えば、連続鋳造法によつて溶綱から鋳片を製
造する場合、鋼品質上の要請から、溶鋼流と大気
との接触を避けるため溶鋼取鍋とタンデイツシユ
間、タンデイツシユとモールド間を耐火物製の長
円筒形の流通管、即ちロングノズル、浸漬ノズル
を用いていわゆる断気鋳造を行なつている。これ
らのノズルは鋳入開始時に高温溶鋼がその細長い
内孔部を通過する際に、熱衝撃をうけるので高耐
熱衝撃性が要求され、また溶鋼による磨耗や溶鋼
成分、パウダー成分との反応に対し高耐食性も要
求される。これらのノズルの材質としてはアルミ
ナや炭素のような中性材料がもつている化学的安
定性と炭素（黒鉛）の低膨張性とを利用したアル
ミナーカーボン質が多く使用されている。一方、
連続鋳造では鋳造中の溶鋼温度が鋳入初期及び末
期に低下し、その際、ノズル内壁に地金が大量に
付着し安定な鋳造が困難になることが多い。これ
を防止する方法としては従来、鋳造をいつたん停
止しノズル内孔を酸素洗浄することによつて地金
を除去し再鋳造を行なう方法も採用されている
が、この方法では鋳造中断部の鋼に非金属介在物
が増大し、鋼の品質劣化を引き起こすことがしば
しばあり、その対策が切望されていた。
For example, when producing slabs from molten steel using the continuous casting method, in order to prevent the molten steel flow from coming into contact with the atmosphere, the spaces between the molten steel ladle and the tundish, and between the tundish and the mold are made of refractory material. The so-called closed-air casting is performed using a long cylindrical flow pipe, that is, a long nozzle or a submerged nozzle. These nozzles are required to have high thermal shock resistance because they are subjected to thermal shock when high-temperature molten steel passes through the long and narrow inner hole at the start of casting. High corrosion resistance is also required. As the material for these nozzles, alumina carbon is often used, which takes advantage of the chemical stability of neutral materials such as alumina and carbon and the low expansion properties of carbon (graphite). on the other hand,
In continuous casting, the temperature of molten steel during casting decreases at the beginning and end of casting, and at this time, a large amount of base metal adheres to the inner wall of the nozzle, making stable casting difficult. Conventionally, a method to prevent this has been to stop the casting, clean the inside hole of the nozzle with oxygen, remove the base metal, and then recast. Non-metallic inclusions often increase in steel, causing quality deterioration of the steel, and a countermeasure against this problem has been desperately needed.
ノズル内壁への地金付着は、ノズル外壁の温度
と密接な関係があり、例えば第６図に示すように
ノズル外壁温度が高い程地金付着量が少ない。し
たがつてノズル耐火壁からの熱放散を減少させた
り、ノズル耐火壁自体を積極的に加熱すれば地金
付着量を減少できることが知られている。 The amount of metal deposited on the inner wall of the nozzle is closely related to the temperature of the outer wall of the nozzle. For example, as shown in FIG. 6, the higher the temperature of the outer nozzle wall, the smaller the amount of metal deposited. Therefore, it is known that the amount of deposited metal can be reduced by reducing heat dissipation from the nozzle refractory wall or actively heating the nozzle refractory wall itself.
従来、この知見に基づいて炭素を含有し、導電
性のある物質からなるノズル壁に電極を当接して
通電し、該ノズルを抵抗熱による発熱により直接
的に加熱し、地金付着を減少させる方法（特開昭
55−64857）も試みられている。 Conventionally, based on this knowledge, electrodes are placed in contact with the nozzle wall, which contains carbon and is made of a conductive substance, and electricity is applied to directly heat the nozzle by heat generated by resistance heat, thereby reducing metal adhesion. Method (JP-A-Sho
55-64857) has also been attempted.
この通電加熱方法において用いられている電源
は単相電源であり、被加熱体を挟んで一対の電極
を対向配設し、この電源に電極を接続して電極か
ら被加熱体に通電して電気抵抗により発熱させて
加熱するようになつている。 The power source used in this current heating method is a single-phase power source, in which a pair of electrodes are placed facing each other with the object to be heated in between, and the electrodes are connected to this power source and current is passed from the electrodes to the object to be heated. It is designed to heat up by generating heat using a resistance.
このように単相電源による通電加熱において、
通電加熱域を広げる場合は、多数の電極による通
電回路を形成するか大形の電極を配設する必要が
あり、この場合大電源を必要とし設備費、電力消
費量が嵩むといつた問題がある。 In this way, in current heating using a single-phase power supply,
In order to widen the heating area, it is necessary to form a current-carrying circuit with many electrodes or to install large electrodes.In this case, a large power source is required, leading to problems such as increased equipment costs and power consumption. be.
本発明は、前記従来の問題点を解消し比較的小
型で少ない電極を用い少ない電力消費量で広範囲
に亘つて効率的通電加熱ができる通電加熱方法を
提供しようというものである。
SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned conventional problems and to provide an electric heating method that can efficiently conduct electric heating over a wide range with a relatively small size and a small number of electrodes, and low power consumption.
本願発明は、一部又は全部を溶融金属中に浸漬
して溶融金属を流通させる導電性耐火材で形成さ
れた溶融金属用流通管の通電加熱方法において、
溶融金属の流通前は該流通管の大気冷却域に当接
した対の電極と電源により形成される単相の通電
回路に浸漬域に当接した電極を接続して三相の通
電回路を形成し、この三相通電回路により該流通
管の大気冷却域と浸漬域を併せて通電加熱し、溶
融金属の流通時は浸漬域に当接の電極を退避させ
ると共にこの電極と前記単相の通電回路との接続
を遮断し、溶融金属流通中は該単相の通電回路に
よつて大気冷却域を継続して通電加熱することを
特徴とする溶融金属流通管の通電加熱方法であ
る。
The present invention provides a method for electrically heating a molten metal flow pipe formed of a conductive refractory material through which the molten metal flows by immersing the molten metal in part or in its entirety in the molten metal.
Before the molten metal flows, the electrode in contact with the immersion area is connected to a single-phase current-carrying circuit formed by a pair of electrodes in contact with the atmospheric cooling area of the flow pipe and a power source, forming a three-phase current-carrying circuit. The three-phase energizing circuit heats both the atmospheric cooling region and the immersed region of the flow pipe, and when the molten metal is flowing, the electrode in contact with the immersed region is evacuated and the single-phase current is energized between this electrode and the immersed region. This is a method for energizing and heating a molten metal flow pipe, which is characterized in that the connection to the circuit is cut off, and the atmospheric cooling region is continuously heated by energization by the single-phase current-carrying circuit during the flow of molten metal.
以下に本発明の実施例を本発明を実施するため
の装置例と共に説明する。
Embodiments of the present invention will be described below along with examples of devices for carrying out the present invention.
本実施例は連続鋳造用浸漬ノズルの予熱および
加熱に適用した場合のものである。 This example is applied to preheating and heating of an immersion nozzle for continuous casting.
第１図，第５図において、１はタンデイツシ
ユ、２はタンデイツシユ１の底部に設けた浸漬ノ
ズル、例えばアルミナーカーボン系導電性耐火材
により形成される。３は浸漬ノズル開閉用のスラ
イデイングノズル、４はタンデイツシユ１の底部
に浸漬ノズル２を挟んで対向して設けた一対の支
持装置で、この支持装置４，４′には駆動装置５，
５′を介して電極Ｃ，C′が進退可能に支持されて
いる。 In FIGS. 1 and 5, 1 is a tundish, and 2 is a submerged nozzle provided at the bottom of the tundish 1, which is made of, for example, an alumina-carbon based conductive refractory material. 3 is a sliding nozzle for opening and closing the immersion nozzle; 4 is a pair of support devices provided at the bottom of the tundish 1 facing each other with the immersion nozzle 2 in between;
The electrodes C and C' are supported so as to be movable back and forth via the electrode 5'.
この電極Ｃ，C′は銅電極６と炭素電極７からな
り、この炭素電極７には浸漬ノズル２の外周の曲
面に対応する凹曲面を形成した可縮性導電体８は
貼着されている。 These electrodes C and C' consist of a copper electrode 6 and a carbon electrode 7, and a contractible conductor 8 having a concave curved surface corresponding to the curved surface of the outer periphery of the immersion nozzle 2 is attached to this carbon electrode 7. .
又、電極Ｃ，C′の銅電極６は、導線９により電
源１０に接続され単相通電回路を形成している。 Further, the copper electrodes 6 of the electrodes C and C' are connected to a power source 10 through a conductive wire 9 to form a single-phase current-carrying circuit.
鋳型１１の上方には駆動装置１２が配設されて
おり、この駆動装置１２には、水平方向に旋回
し、浸漬ノズル２の下端面に当接される電極C0
が設けられている。 A drive device 12 is disposed above the mold 11, and this drive device 12 includes an electrode C 0 which rotates in the horizontal direction and comes into contact with the lower end surface of the immersion nozzle 2.
is provided.
この電極C0は銅電極１３と炭素電極１４から
なり、炭素電極１４の上面には可縮性の導電体１
５が貼着されており、銅電極１３は導線１６によ
りコネクター１７を介して電源１０に接続され、
前記単相通電回路とにより三相通電回路が形成さ
れるようになつている。 This electrode C0 consists of a copper electrode 13 and a carbon electrode 14, and a contractible conductor 1 is placed on the upper surface of the carbon electrode 14.
5 is attached, the copper electrode 13 is connected to the power source 10 via the connector 17 by the conductor 16,
A three-phase current-carrying circuit is formed by the single-phase current-carrying circuit.
本発明においては、この通電加熱装置によつ
て、先ず浸漬ノズル２に溶鋼を流通させる前に浸
漬ノズル２の全体を予熱する。浸漬ノズル２を予
熱する場合は、先ず鋳型１１の上方の駆動装置１
２を駆動して、電極C0を旋回して所定の位置に
位置させておき、タンデイツシユ１を移動して浸
漬ノズル２の先端面を電極C0の上面に当接する。 In the present invention, first, the entire immersed nozzle 2 is preheated by this electrical heating device before flowing molten steel through the immersed nozzle 2. When preheating the immersion nozzle 2, first the drive device 1 above the mold 11 is heated.
2 is driven to rotate the electrode C 0 to a predetermined position, and the tundish 1 is moved to bring the tip end surface of the immersion nozzle 2 into contact with the upper surface of the electrode C 0 .
又、駆動装置５，５′を駆動して電極ＣとC′を
浸漬ノズル２の外周面に押圧して可縮性導電体８
が炭素電極７と浸漬ノズル２の外周面に密着させ
炭素電極７と浸漬ノズル２間の通電性を良好に保
持した状態で電極Ｃ，C′に接続された導線９を電
源９を電源１０に接続し、単相通電回路を形成
し、更に、この単相通電回路にコネクター１７を
介して電極C0に接続された導線１６を接続して
三相通電回路を形成し、通電を開始する。 Further, the drive devices 5 and 5' are driven to press the electrodes C and C' against the outer peripheral surface of the submerged nozzle 2, thereby forming the compressible conductor 8.
is brought into close contact with the outer peripheral surfaces of the carbon electrode 7 and the immersion nozzle 2, maintaining good conductivity between the carbon electrode 7 and the immersion nozzle 2, and then connecting the conductor 9 connected to the electrodes C and C' from the power source 9 to the power source 10. Then, the conducting wire 16 connected to the electrode C 0 is connected to the single-phase energizing circuit via the connector 17 to form a three-phase energizing circuit, and energization is started.
この通電によつて、電極Ｃ，C′と電極C0間の
浸漬ノズル２のほぼ全域に亘つて通電される。 By this energization, electricity is applied to almost the entire area of the submerged nozzle 2 between the electrodes C and C' and the electrode C0 .
この浸漬ノズル２は導電性の耐火物からなつて
おり、高い電気抵抗を有するため通電された場
合、この電気抵抗熱によつて発熱し、昇温する。
所定の温度に達したら第２図に示すように浸漬ノ
ズル２先端に当接されている電極C0をその駆動
装置１２の駆動により旋回退避させると共に導線
１６をコネクター１７から外し、三相通電回路を
遮断し、浸漬ノズル２の下部の通電加熱を停止
し、その予熱過程を終了する。 The immersion nozzle 2 is made of a conductive refractory and has a high electrical resistance, so when it is energized, it generates heat due to the heat of the electrical resistance and its temperature rises.
When the predetermined temperature is reached, as shown in FIG. 2, the electrode C0 that is in contact with the tip of the immersion nozzle 2 is rotated and retracted by the drive of its driving device 12, and the conductor 16 is removed from the connector 17, and the three-phase current-carrying circuit is completed. is shut off, the electrical heating of the lower part of the immersion nozzle 2 is stopped, and the preheating process is completed.
この場合、単相通電回路における通電は継続し
ており、浸漬ノズル２の大気冷却域の加熱は継続
している。つぎにタンデイツシユ１を下降させ、
浸漬ノズル２の下端部を鋳型１１内に位置させ、
スライデイングノズル３を開操作してタンデイツ
シユ１内の溶鋼Ｓを浸漬ノズル２経由鋳型１１内
に流入させ、連続鋳造作業を開始する。 In this case, the single-phase current supply circuit continues to be energized, and the atmospheric cooling region of the submerged nozzle 2 continues to be heated. Next, lower the tandem tray 1,
Position the lower end of the immersion nozzle 2 within the mold 11,
The sliding nozzle 3 is opened to allow the molten steel S in the tundish 1 to flow into the mold 11 via the immersion nozzle 2, and continuous casting work is started.
連続鋳造作業終了あるいはタンデイツシユ１の
切替えに際しては、タンデイツシユ１を上昇さ
せ、前記単相通電回路による通電を停止し、浸漬
ノズル２の大気冷却域の通電加熱を停止する。 When the continuous casting operation is completed or the tundish 1 is switched, the tundish 1 is raised, the single-phase energization circuit is stopped, and the energized heating of the atmospheric cooling region of the immersion nozzle 2 is stopped.
この場合、電極Ｃ，C′は、駆動装置５により退
避させておくが、電極Ｃ，C′は浸漬ノズル２に当
接したままにしておいても良い。第３図は浸漬ノ
ズル２の大気冷却域を２対の電極Ｃ，C′，C1，
C1′による２つの単相通電回路を設けた場合のも
のである。 In this case, the electrodes C and C' are retracted by the drive device 5, but the electrodes C and C' may be left in contact with the immersion nozzle 2. Figure 3 shows the atmospheric cooling region of the submerged nozzle 2 using two pairs of electrodes C, C', C 1 ,
This is the case when two single-phase current carrying circuits are provided using C 1 '.
この例においては、予熱過程では電極Ｃ，C′に
よる単相通電回路と電極C0による通電回路とを
コネクター１７を介して接続して三相通電回路を
形成し、この三相通電回路によつて電極Ｃ，C′と
電極C0間の浸漬ノズル２のほぼ全域に亘つて通
電し、加熱するようになつており、又、連続鋳造
作業中は第４図のように電極C0は駆動装置１２
により旋回退避させると共に導線１６をコネクタ
ー１７から外し、三相通電回路を遮断する。 In this example, in the preheating process, a single-phase current-carrying circuit by electrodes C and C' and a current-carrying circuit by electrode C0 are connected via connector 17 to form a three-phase current-carrying circuit. During the continuous casting operation, the electrode C0 is driven as shown in Fig. 4. device 12
At the same time, the conductor 16 is removed from the connector 17, and the three-phase energization circuit is cut off.
この場合電極Ｃ，C′による単相通電回路は通電
を継続している。 In this case, the single-phase current-carrying circuit formed by electrodes C and C' continues to be energized.
そして、これに電極C1，C1′による単相通電回
路も接続されており、浸漬ノズル２の大気冷却域
を２対の単相通電回路によつて通電加熱するよう
になつている。なお、本実施例においては、大気
冷却域を通電加熱するための電極Ｃ，C′および電
極C1，C1′はタンデイツシユ１の底部に設けた支
持体４，４′で支持するようにしたが、鋳型近傍
に支持体を別設しても良い。 A single-phase energizing circuit including electrodes C 1 and C 1 ' is also connected to this, so that the atmospheric cooling area of the immersed nozzle 2 is heated by energizing the two pairs of single-phase energizing circuits. In this example, the electrodes C and C' and the electrodes C1 and C1 ' for heating the atmospheric cooling region by electricity were supported by supports 4 and 4' provided at the bottom of the tundish 1. However, a support may be provided separately near the mold.
又、三相通電回路形成用の電極C0の駆動装置
は鋳型上方に前記支持体と切離して設けたが、該
支持体と一体的に設けても良い。 Further, although the drive device for the electrode C0 for forming the three-phase current circuit was provided above the mold separately from the support, it may be provided integrally with the support.
本発明の通電加熱方法においては、単相通電回
路と三相通電回路を併用し、必要に応じて通電回
路を切替えて通電加熱するようにしたので、被加
熱体全域および局部的な通電加熱が比較的小型の
少ない電極で効率良く均一に加熱でき設備コス
ト、電力消費も効率的であり電力消費量の節減に
も寄与するものである。
In the energization heating method of the present invention, a single-phase energization circuit and a three-phase energization circuit are used in combination, and the energization circuit is switched as necessary to perform energization heating, so that energization heating can be performed over the entire area of the object to be heated and locally. It is possible to heat efficiently and uniformly with a relatively small number of electrodes, and equipment costs and power consumption are also efficient, contributing to reductions in power consumption.
第１図および第２図は本発明を実施する装置の
一例を示す一部切欠断面説明図、第３図および第
４図は本発明を実施する装置の他の例を示す一部
切欠断面説明図、第５図は第１図のＩ−I′線矢視
説明図である。第６図は浸漬ノズルの加熱温度
と、地金付着量との関係を示す説明図である。
１……タンデイツシユ、２……浸漬ノズル、３
……スライデイングノズル、４……支持体、５…
…駆動装置、６……銅電極、７……炭素電極、８
……可縮性導電体、９……導線、１０……電源、
１１……鋳型、１２……駆動装置、１３……銅電
極、１４……炭素電極、１５……可縮性導電体、
１６……導線、１７……コネクター、Ｃ，C′……
電極、C1，C1′……電極、C0……電極、Ｓ，S′…
…溶鋼。
1 and 2 are partially cutaway cross-sectional explanatory views showing an example of an apparatus for implementing the present invention, and FIGS. 3 and 4 are partially cutaway cross-sectional views showing other examples of apparatus for implementing the present invention. 5 is an explanatory view taken along the line I-I' in FIG. 1. FIG. 6 is an explanatory diagram showing the relationship between the heating temperature of the immersion nozzle and the amount of deposited metal. 1...Tandate dish, 2...Immersion nozzle, 3
...Sliding nozzle, 4...Support, 5...
...Drive device, 6...Copper electrode, 7...Carbon electrode, 8
... Contractible conductor, 9 ... Conductor wire, 10 ... Power supply,
11... Mold, 12... Drive device, 13... Copper electrode, 14... Carbon electrode, 15... Contractible conductor,
16... Conductor, 17... Connector, C, C'...
Electrode, C 1 , C 1 ′... Electrode, C 0 ... Electrode, S, S'...
...molten steel.
Claims (1)
属を流通させる導電性耐火材で形成された溶融金
属用流通管の通電加熱方法において、溶融金属の
流通前は該流通管の大気冷却域に当接した対の電
極と電源により形成される単相の通電回路に浸漬
域に当接した電極を接続して三相の通電回路を形
成し、この三相通電回路により該流通管の大気冷
却域と浸漬域を併せて通電加熱し、溶融金属の流
通時は浸漬域に当接の電極を退避させると共にこ
の電極と前記単相の通電回路との接続を遮断し、
溶融金属流通中は該単相の通電回路によつて大気
冷却域を継続して通電加熱することを特徴とする
溶融金属流通管の通電加熱方法。1. In a method of energizing a flow pipe for molten metal made of a conductive refractory material through which the molten metal flows by immersing a part or all of it in the molten metal, the flow pipe is cooled in the atmosphere before the flow of the molten metal. A three-phase current-carrying circuit is formed by connecting the electrode in contact with the immersion area to a single-phase current-carrying circuit formed by a pair of electrodes in contact with the immersion area and a power source, and this three-phase current-carrying circuit connects the electrode in contact with the immersion area to a single-phase current-carrying circuit formed by a pair of electrodes in contact with the immersion area and a power supply. Both the cooling zone and the immersion zone are electrically heated, and when the molten metal is flowing, the electrode in contact with the immersion zone is evacuated and the connection between this electrode and the single-phase current-carrying circuit is cut off.
A method for energizing and heating a molten metal flow pipe, characterized in that during molten metal flow, the atmospheric cooling region is continuously energized and heated by the single-phase energizing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP852085A JPS61169145A (en) | 1985-01-22 | 1985-01-22 | Method for electrically heating molten-metal flowing pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP852085A JPS61169145A (en) | 1985-01-22 | 1985-01-22 | Method for electrically heating molten-metal flowing pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61169145A JPS61169145A (en) | 1986-07-30 |
| JPH0479742B2 true JPH0479742B2 (en) | 1992-12-16 |
Family
ID=11695420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP852085A Granted JPS61169145A (en) | 1985-01-22 | 1985-01-22 | Method for electrically heating molten-metal flowing pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61169145A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160002232A (en) * | 2014-06-30 | 2016-01-07 | 현대중공업 주식회사 | Ship propulsion unit that rectifier unit is applied |
-
1985
- 1985-01-22 JP JP852085A patent/JPS61169145A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160002232A (en) * | 2014-06-30 | 2016-01-07 | 현대중공업 주식회사 | Ship propulsion unit that rectifier unit is applied |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61169145A (en) | 1986-07-30 |
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