WO2015056287A1 - Preheating method for ladle for molten aluminum and preheating device - Google Patents
Preheating method for ladle for molten aluminum and preheating device Download PDFInfo
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- WO2015056287A1 WO2015056287A1 PCT/JP2013/006196 JP2013006196W WO2015056287A1 WO 2015056287 A1 WO2015056287 A1 WO 2015056287A1 JP 2013006196 W JP2013006196 W JP 2013006196W WO 2015056287 A1 WO2015056287 A1 WO 2015056287A1
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- ladle
- preheating
- aluminum
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- flame
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- 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
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
- B22D41/01—Heating means
- B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/04—Casting aluminium or magnesium
Definitions
- the present invention relates to a method of preheating an aluminum molten metal ladle in which a molten metal of pure aluminum or aluminum alloy is temporarily stored, and a preheating apparatus for carrying out the method.
- a ladle is used to receive a molten aluminum metal and inject it into a mold in the production process of pure aluminum or aluminum alloy (hereinafter collectively referred to simply as "aluminum") castings.
- aluminum pure aluminum or aluminum alloy
- the temperature inside the ladle can be efficiently raised to the target temperature.
- a ladle that handles molten aluminum ie, a molten aluminum ladle
- the molten aluminum remaining as a residual drop in the ladle solidifies.
- Heat is applied approximately locally to approximately 1000 ° C. for the formed coagulum.
- non-metallic inclusions centering on ⁇ -Al 2 O 3 are generated from the coagulated matter, and this becomes an attached matter and adheres and deposits on the inner surface of the ladle.
- the main object of the present invention is to efficiently preheat the inside of the aluminum melt ladle, and to minimize the reduction of the effective volume of the ladle even when the ladle is repeatedly preheated and used. It is an object of the present invention to provide a method for preheating an aluminum molten metal ladle, and a preheating apparatus using the method, which can suppress the contamination of the molten metal due to nonmetallic inclusions as well as suppressing it.
- this invention comprised the preheating method of the ladle for molten aluminum as follows, for example, as shown to FIGS. 1-3.
- the inside of the ladle 12 is preheated by a flame 30 injected from a burner 24 attached to the opening 16 of the aluminum ladle 12. It is characterized in that it is surrounded by a preheating pipe 26 made of a thin metal sheet material.
- the "heat resistance" of the thin metal sheet constituting the preheating tube 26 refers to the heat resistance to such an extent that the shape of the material does not change even when the flame 30 injected from the burner 24 is surrounded in the vicinity thereof.
- the present invention works as follows, for example, as shown in FIGS. 1 to 3 of the same. That is, since the flame 30 injected from the burner 24 is surrounded by the preheating pipe 26, the inside of the ladle 12 is not direct flame heating but indirect heating through the preheating pipe 26. For this reason, it is possible to prevent the local formation of a high temperature region near approximately 1000 ° C. locally on the inner surface of the ladle 12 while maintaining the characteristic of heating by the burner 24 that the temperature rise is quick. As a result, it is possible to minimize the adhesion of nonmetallic inclusions centering on ⁇ -Al 2 O 3 on the inner surface of the ladle 12.
- a preheating apparatus is an apparatus for carrying out the method described above, and is configured as follows, for example, as shown in FIGS. 1 and 2. That is, the apparatus comprises a burner 24 for injecting a flame 30 from the opening 16 of the aluminum melt ladle 12 toward the inside thereof, and a preheating tube 26 made of heat-resistant thin metal sheet and surrounding the flame 30. It is characterized by
- the reduction of the effective volume of the ladle can be minimized even if the ladle is repeatedly preheated and used.
- FIG. 1 shows an example of a molten metal ladle 12 equipped with a preheating device 10 of the present invention.
- the aluminum molten metal ladle 12 of the illustrated embodiment has a cylindrical body 14 with a bottom.
- An opening 16 is provided on the upper surface of the main body 14, and a large lid 18 is disposed in the opening 16.
- Flanges (not shown) are provided on the outer periphery of the main body 14 and the large lid 18, respectively, and the flanges are fastened with bolts (not shown) to fix them.
- the main body 14 described above has a metal casing 14a that forms the outer periphery thereof, and a heat insulating material 14b and a refractory material 14c are attached in this order to the inside of the casing 14a. Further, at one place on the outer periphery of the main body 14, a flow path 14d for taking out the molten aluminum from the inside of the main body 14 is provided. Furthermore, two fork insertion parts 20 having a predetermined length and a hollow rectangular shape in vertical cross section in which the fork of the forklift is inserted are attached to the bottom of the main body 14 so as to be parallel to each other.
- the large lid 18 also has a fireproof material 18a attached to the inner surface thereof.
- an opening 18b is formed which communicates the outside of the large lid 18 with the opening 16 to be a receiving port, and the opening 18b is a hatch for opening and closing the opening 18b. 22 is attached.
- the hatch 22 is attached to the large lid 18 via a hinge (not shown). Then, when preheating the inside of the aluminum molten metal ladle 12, with the hatch 22 open, the preheating device 10 is inserted from the opening 18b through the opening 16.
- the preheating device 10 is roughly configured of a burner 24, a preheating pipe 26, and a drive mechanism 28.
- the burner 24 is a device for injecting a flame 30 for heating into the main body 14 of the aluminum molten metal ladle 12 and is a gaseous fuel burner using city gas, liquefied petroleum gas (LPG) or the like as fuel, heavy oil, Any of liquid fuel burners using diesel fuel, kerosene, gasoline or the like as fuel can be used.
- LPG liquefied petroleum gas
- a flange 24a is provided at a portion of the burner head where the flame injection port (not shown) of the burner 24 is provided, and the preheating pipe 26 is connected to the burner 24 via the flange 24a.
- FIG. 1 and FIG. 2 illustration of a piping system and the like connected to the burner 24 is omitted.
- the preheating tube 26 is a bottomed cylindrical tube surrounding the periphery of the flame 30 injected from the burner 24.
- the preheating tube 26 is a metal thin film having heat resistance such that the shape of the material does not change even if the flame 30 injected from the burner 24 is surrounded in its vicinity, such as heat resistant steel such as SUS309S or SUS310S in JIS standard. It is made of plate material.
- a refractory material 26a such as castable is laid at the bottom of the preheating pipe 26, and one or more (two in the example shown in FIGS. 1 and 2) exhaust holes are provided on the side circumferential surface in the vicinity thereof. 26b is drilled.
- the exhaust hole 26 b at such a position, the high temperature combustion exhaust gas discharged together with the flame 30 by the burner 24 is supplied into the main body 14 of the aluminum molten metal ladle 12. Then, the combustion exhaust gas circulates inside the main body 14 or is directly discharged to the outside of the aluminum molten metal ladle 12 through the flow path 14 d.
- the exhaust hole 26b at such a position, in addition to the radiant heat generated by the flame 30 heating the preheating tube 26, the high temperature combustion exhaust gas extending throughout the internal space of the aluminum molten metal ladle 12 is also the ladle 12 Contribute to the preheating of As a result, the entire inside of the aluminum molten metal ladle 12 can be efficiently preheated.
- a refractory material 32a such as castable is disposed on the lower surface on the upper outer periphery of the preheating tube 26, and when the preheating device 10 is mounted on the aluminum molten metal ladle 12, as shown in FIG.
- a collar 32 is provided which functions as a sealing lid for closing the 18 openings 18b.
- the drive mechanism 28 is a mechanism for driving the burner 24 and the preheating tube 26 connected thereto up and down, and a pair of left and right arms 34 erected on the upper surface of the above-mentioned flange portion 32 and the upper end of this arm 34 And a hanging bracket 40 provided at the longitudinal center of the horizontal ridge 36 and to which a hook 38 of a lifting device such as a hoist is attached, and a pair of hanging arms 42 hanging down from above It is inserted into guide holes (not shown) provided at both longitudinal ends of the horizontal ridge 36, and is connected to the horizontal ridge 36 through the arm 34 and the ridge portion 32. It comprises the preheating tube 26 and a hanging arm 42 for guiding the vertical movement of the burner 24.
- FIG. 3 shows molten aluminum in the case where the molten aluminum ladle 12 is preheated only by the burner without using the preheating pipe (conventional example) and when the preheating device 10 having the above configuration is used (example) It is the graph which showed the relationship between the frequency
- the increase in weight of the aluminum molten metal ladle 12 is the result of the formation and adhesion of non-metallic inclusions centering on ⁇ -Al 2 O 3 in the above-described conventional example and examples.
- a gas burner with a maximum output of 100,000 kcal / h was used as a burner, and preheating was performed until the inside of the aluminum molten metal ladle 12 reached 700 ° C.
- a fireproof material 26a made of SUS310S (JIS) with a thickness of 5 mm, having an outer diameter of 200 mm and a total length of 1,115 mm, and a castable of 50 mm thickness is laid inside its bottom.
- a pair of exhaust holes 26b with a diameter of 120 mm was used in contact with the upper end of the refractory material 26a on the side peripheral surface thereof.
- the weight of the ladle 12 is approximately 25% when the number of times of use of the ladle 12 exceeds 500 times. It will increase more than that.
- the weight increase rate does not exceed 10%. That is, this can prevent the local formation of a high temperature region near 1000 ° C.
- the preheating method and the preheating apparatus 10 of the present invention in which the flame 30 is surrounded by the preheating tube 26 when the aluminum melt ladle 12 is preheated by the flame 30 of the burner 24. Even if the pan 12 is repeatedly preheated and used, the reduction of the effective volume of the ladle 12 can be minimized, and the contamination of the molten metal due to nonmetallic inclusions can also be reduced.
- the exhaust hole 26b of the preheating pipe 26 is provided on the lower end side of the preheating pipe 26.
- the position of the exhaust hole 26b is not limited to this.
- the exhaust hole may be provided at a position close to the burner at the top of the preheating tube. In this case, heat may be exchanged between the high temperature flue gas discharged from the exhaust port and the combustion air supplied to the burner.
- the preheating tube 26 may have any shape as long as it surrounds the flame 30 of the burner 24.
- the outer diameter and the inner diameter of the lower side may be expanded or reduced via a step provided in the middle of the circular pipe.
- the drive mechanism 28 of the preheating device 10 a case is shown in which the left and right arms 34, the horizontal hook 36, the hanging bracket 40 to which the hooks 38 of the lifting device are attached, and the pair of left and right hanging arms 42
- the drive mechanism 28 may be in any form as long as it can drive the burner 24 and the preheating tube 26 connected thereto up and down along a predetermined flow line. It is not limited.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Description
本発明は、純アルミニウム或いはアルミニウム合金の溶湯が一時的に貯留されるアルミニウム溶湯用取鍋の予熱方法及びその方法を実施するための予熱装置に関する。 The present invention relates to a method of preheating an aluminum molten metal ladle in which a molten metal of pure aluminum or aluminum alloy is temporarily stored, and a preheating apparatus for carrying out the method.
純アルミニウム或いはアルミニウム合金(以下、これらをまとめて単に「アルミニウム」という。)鋳物の製造工程において、アルミニウム溶湯を受け取り鋳型に注入するために取鍋が用いられている。そして、かかる取鍋にアルミニウム溶湯を受け入れる際には、予め取鍋を加熱し、取鍋内部の温度とアルミニウム溶湯の温度との差が可能な限り小さくなるようにしている。こうすることで、アルミニウム溶湯の温度低下を防ぎ、得られるアルミニウム鋳物の性質を均一にすることができるからである。 A ladle is used to receive a molten aluminum metal and inject it into a mold in the production process of pure aluminum or aluminum alloy (hereinafter collectively referred to simply as "aluminum") castings. When the molten aluminum is received in the ladle, the ladle is heated in advance so that the difference between the temperature inside the ladle and the temperature of the molten aluminum becomes as small as possible. This is because the temperature drop of the molten aluminum can be prevented and the properties of the obtained aluminum casting can be made uniform.
従来、上述のように取鍋を予熱する方法としては、取鍋の開口部にバーナーを備える取鍋蓋を被せて、そのバーナーから噴射される火炎（燃焼ガス）によって取鍋の内部を直火で加熱することが行なわれていた（例えば、特許文献１参照）。 Conventionally, as a method of preheating a ladle as described above, a ladle lid provided with a burner is placed on the opening of the ladle, and the inside of the ladle is directly heated by the flame (combustion gas) injected from the burner Heating has been carried out (see, for example, Patent Document 1).
上記従来技術のように、取鍋内部をバーナーの火炎で直火加熱すれば、取鍋の内部を目的とする温度まで効率よく昇温させることができる。
しかしながら、アルミニウム溶湯を取り扱う取鍋(すなわち、アルミニウム溶湯用取鍋)の場合、当該取鍋の内部をバーナーの火炎で直火加熱すると、取鍋内部に残滴として残ったアルミニウム溶湯が凝固して形成された凝固物に対して、局所的に概ね１０００℃近い熱が与えられるようになる。そうすると、その凝固物からα－Ａｌ2Ｏ3を中心とした非金属介在物が生成され、これが付着物となって取鍋の内面に付着・堆積するようになる。このため、バーナーによる直火加熱を繰り返すことによって、取鍋の内面に上記付着物が漸次堆積し、取鍋重量が漸増すると共に、取鍋内部の有効容積が減少するようになるという問題が有った。また、このような付着物が堆積することによって、取鍋の内部に貯留したアルミニウム溶湯中へ当該付着物の一部が脱落して混入するようになり、これ(＝非金属介在物)が鋳造時におけるハードスポットなどの欠陥の原因になるという問題も有った。
As in the prior art, if the inside of the ladle is directly heated by the flame of the burner, the temperature inside the ladle can be efficiently raised to the target temperature.
However, in the case of a ladle that handles molten aluminum (ie, a molten aluminum ladle), when the inside of the ladle is directly heated by the flame of the burner, the molten aluminum remaining as a residual drop in the ladle solidifies. Heat is applied approximately locally to approximately 1000 ° C. for the formed coagulum. Then, non-metallic inclusions centering on α-Al 2 O 3 are generated from the coagulated matter, and this becomes an attached matter and adheres and deposits on the inner surface of the ladle. For this reason, there is a problem that the above-mentioned deposit gradually deposits on the inner surface of the ladle by repeating direct heating by the burner, and the ladle weight gradually increases and the effective volume inside the ladle decreases. It was In addition, due to the deposition of such deposits, a part of the deposits is dropped and mixed into the molten aluminum stored in the inside of the ladle, and this (= non-metallic inclusion) is cast There was also a problem of causing defects such as hard spots at times.
それゆえに、本発明の主たる課題は、アルミニウム溶湯用取鍋の内部を効率よく予熱できるのに加え、かかる取鍋を繰り返し予熱して使用しても当該取鍋の有効容積の減少を最小限に抑えることができると共に、非金属介在物による溶湯の汚染も低減させることが可能な、アルミニウム溶湯用取鍋の予熱方法と該方法を用いた予熱装置とを提供することにある。 Therefore, the main object of the present invention is to efficiently preheat the inside of the aluminum melt ladle, and to minimize the reduction of the effective volume of the ladle even when the ladle is repeatedly preheated and used. It is an object of the present invention to provide a method for preheating an aluminum molten metal ladle, and a preheating apparatus using the method, which can suppress the contamination of the molten metal due to nonmetallic inclusions as well as suppressing it.
上記課題を解決するため、本発明は、例えば、図１から図３に示すように、アルミニウム溶湯用取鍋の予熱方法を次のように構成した。
アルミニウム溶湯用取鍋１２の開口部１６に取付けたバーナー２４から噴射される火炎３０で当該取鍋１２の内部を予熱するアルミニウム溶湯用取鍋１２の予熱方法において、上記の火炎３０を耐熱性の金属薄板材からなる予熱管２６で囲繞することを特徴とする。
ここで、予熱管２６を構成する金属薄板材の「耐熱性」とは、バーナー２４から噴射される火炎３０をその近傍で囲繞しても物質形状が変化しない程度の耐熱性をいう。
In order to solve the said subject, this invention comprised the preheating method of the ladle for molten aluminum as follows, for example, as shown to FIGS. 1-3.
In the method for preheating
Here, the "heat resistance" of the thin metal sheet constituting the preheating
本発明は、例えば、同上の図１から図３に示すように、次のように作用する。
すなわち、バーナー２４から噴射される火炎３０の周囲を予熱管２６で囲繞しているので、取鍋１２の内部が直火加熱ではなく予熱管２６を介した間接加熱となる。このため、温度の立ち上がりが早いといったバーナー２４による加熱の特性を保ちつつ、取鍋１２の内面において局所的に概ね１０００℃近い高温領域が形成されるのを防止することができる。その結果、取鍋１２の内面に、α－Ａｌ2Ｏ3を中心とした非金属介在物が付着するのを最小限に抑えることができるようになる。
The present invention works as follows, for example, as shown in FIGS. 1 to 3 of the same.
That is, since the
また、第２の発明にかかる予熱装置は、上述した方法を実施するための装置であって、例えば、図１及び図２で示すように、次のように構成したものである。
すなわち、アルミニウム溶湯用取鍋１２の開口部１６からその内部へ向けて火炎３０を噴射するバーナー２４と、耐熱性の金属薄板材からなり上記の火炎３０を囲繞する予熱管２６とを具備することを特徴とする。
A preheating apparatus according to a second aspect of the present invention is an apparatus for carrying out the method described above, and is configured as follows, for example, as shown in FIGS. 1 and 2.
That is, the apparatus comprises a
本発明によれば、アルミニウム溶湯用取鍋の内部を効率よく予熱できるのに加え、かかる取鍋を繰り返し予熱して使用しても当該取鍋の有効容積の減少を最小限に抑えることができると共に、非金属介在物による溶湯の汚染も低減させることが可能な、アルミニウム溶湯用取鍋の予熱方法と該方法を用いた予熱装置とを提供することができる。 According to the present invention, in addition to efficiently preheating the inside of the aluminum molten metal ladle, the reduction of the effective volume of the ladle can be minimized even if the ladle is repeatedly preheated and used. In addition, it is possible to provide a method for preheating an aluminum molten metal ladle and a preheating apparatus using the method, which can reduce the contamination of the molten metal due to nonmetallic inclusions.
以下、本発明の実施の形態を図１及び図２によって説明する。図１は、本発明の予熱装置１０が装着されたアルミニウム溶湯用取鍋１２の一例を示すものである。
ここで、先ず始めに、この図１を参照してアルミニウム溶湯用取鍋１２について説明する。図示実施形態のアルミニウム溶湯用取鍋１２は、有底で筒状の本体１４を有する。この本体１４の上面には開口部１６が設けられており、当該開口部１６に大蓋１８が配置されている。なお、この本体１４と大蓋１８との外周にはそれぞれフランジ(図示せず)が設けられており、これらフランジ間をボルト(図示せず)で締結して両者が固定される。
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 shows an example of a
Here, first, the aluminum
上記の本体１４は、その外周を形成する金属製のケーシング１４ａを有しており、このケーシング１４ａの内側に断熱材１４ｂ及び耐火材１４ｃがこの順で取着されている。また、この本体１４の外周の１箇所には、本体１４内部からアルミニウム溶湯を取り出すための流路１４ｄが設けられている。さらに、本体１４の底面には、フォークリフトのフォークが挿入される垂直断面が中空矩形状で所定の長さを有するフォーク差込部２０が互いに平行するように２本取付けられている。
The
上記の大蓋１８も上記の本体１４と同様に、その内面には耐火材１８ａが取着されている。この大蓋１８のほぼ中央には、当該大蓋１８の外部と開口部１６とを連通して受湯口となる開孔１８ｂが設けられており、この開孔１８ｂには、これを開閉するハッチ２２が取付けられる。なお、このハッチ２２は、図示しないヒンジを介して大蓋１８に取付けられている。そして、アルミニウム溶湯用取鍋１２の内部を予熱する際には、このハッチ２２を開いた状態で開孔１８ｂから開口部１６を経て予熱装置１０が挿入される。
Similar to the
予熱装置１０は、バーナー２４と、予熱管２６と、駆動機構２８とで大略構成される。
このうち、バーナー２４は、アルミニウム溶湯用取鍋１２の本体１４内部に加熱用の火炎３０を噴射する装置で、都市ガス・液化石油ガス(ＬＰＧ)などを燃料とする気体燃料バーナーや、重油・軽油・灯油・ガソリンなどを燃料とする液体燃料バーナー等の何れをも使用することができる。また、このバーナー２４の火炎噴射口(図示せず)が設けられるバーナーヘッドの部分にフランジ２４ａが設けられており、このフランジ２４ａを介してバーナー２４に予熱管２６が接続される。なお、図１及び図２では、このバーナー２４に接続される配管系等の図示は省略している。
The
Among them, the
予熱管２６は、バーナー２４から噴射される火炎３０の周囲を囲繞する有底円筒状の管体である。この予熱管２６は、例えばＪＩＳ規格におけるＳＵＳ３０９ＳやＳＵＳ３１０Ｓといった耐熱鋼などのように、バーナー２４から噴射される火炎３０をその近傍で囲繞しても物質形状が変化しない程度の耐熱性を有する金属薄板材で構成されている。
The
また、この予熱管２６の底部には、キャスタブルなどの耐火材２６ａが敷設されており、その近傍の側周面には、１又は複数(図１及び２に示す例では２つ)の排気孔２６ｂが穿設されている。
ここで、排気孔２６ｂをかかる位置に設けることにより、バーナー２４で火炎３０と共に排出される高温の燃焼排ガスがアルミニウム溶湯用取鍋１２の本体１４内へと供給される。そして、この燃焼排ガスは、本体１４内部を循環した後、或いはダイレクトに流路１４ｄを経由してアルミニウム溶湯用取鍋１２の外部へと排出される。つまり、排気孔２６ｂをかかる位置に設けることにより、火炎３０が予熱管２６を加熱することによって生じる輻射熱に加え、アルミニウム溶湯用取鍋１２の内部空間全体に行き渡る高温の燃焼排ガスも当該取鍋１２の予熱に寄与する。その結果、アルミニウム溶湯用取鍋１２の内部全体を効率よく予熱することができるようになる。
Further, a
Here, by providing the
そして、この予熱管２６の上部外周には、下面にキャスタブルなどの耐火材３２ａが配設され、予熱装置１０をアルミニウム溶湯用取鍋１２に装着した際に、図１で示すように、大蓋１８の開孔１８ｂを塞ぐ密閉蓋として機能する鍔部３２が設けられている。
Then, a
駆動機構２８は、バーナー２４及びこれに連結された予熱管２６を上下駆動させるための機構であり、上記の鍔部３２の上面に立設された左右一対のアーム３４と、このアーム３４の上端に架設された水平棹３６と、この水平棹３６の長手方向中央部に設けられ、ホイストなどの昇降装置のフック３８が取付けられる吊り金具４０と、上方より垂下された左右一対の垂下アーム４２であって、上記水平棹３６の長手方向両端部に穿設されたガイド孔(図示せず)に挿通され、水平棹３６延いてはアーム３４や鍔部３２を介してこの水平棹３６に連結された予熱管２６やバーナー２４の上下動を案内する垂下アーム４２とで構成されている。
The
次に、以上のように構成された予熱装置１０を用いて、アルミニウム溶湯用取鍋１２を予熱した際の作用並びに効果について説明する。
図３は、予熱管を用いずにバーナーのみでアルミニウム溶湯用取鍋１２の予熱を行なった場合(従来例)と、上記構成の予熱装置１０を用いた場合(実施例)とにおける、アルミニウム溶湯用取鍋１２の使用回数（出荷回数）とその重量増加率との関係を示したグラフである。
なお、上記の従来例及び実施例共に、アルミニウム溶湯用取鍋１２の重量増加は、その内部にα－Ａｌ2Ｏ3を中心とした非金属介在物が生成・付着した結果である。
Next, the operation and effect of preheating the aluminum
FIG. 3 shows molten aluminum in the case where the
The increase in weight of the aluminum
また、上記の従来例及び実施例共に、バーナーとして最大出力１０万ｋｃａｌ／ｈのガスバーナーを用い、アルミニウム溶湯用取鍋１２の内部が７００℃に達するまで予熱した。
さらに、実施例の予熱管２６として、板厚５ｍｍのＳＵＳ３１０Ｓ(ＪＩＳ)からなり、外径２００ｍｍ、全長１，１１５ｍｍであって、その底面内部に５０ｍｍ厚のキャスタブルからなる耐火材２６ａが敷設されると共に、その側周面に前記耐火材２６ａの上端に接触する形でφ１２０ｍｍの排気孔２６ｂが一対設けられたものを使用した。
In both of the above-described conventional example and the example, a gas burner with a maximum output of 100,000 kcal / h was used as a burner, and preheating was performed until the inside of the aluminum
Furthermore, as the preheating
図３が示すように、アルミニウム溶湯用取鍋１２をバーナーの火炎で直火加熱する従来例では、当該取鍋１２の使用回数が５００回を超えると、かかる取鍋１２の重量が概ね２５％以上増加するようになる。これに対し、予熱管２６を用いる本実施例では、当該取鍋１２の使用回数が６００回を超えても、その重量増加率が１０％を超えることはない。つまり、このことは、本発明の予熱方法及び予熱装置１０を用いれば、アルミニウム溶湯用取鍋１２の内面において局所的に概ね１０００℃近い高温領域が形成されるのを防止することができ、その結果、当該取鍋１２の内面に、α－Ａｌ2Ｏ3を中心とした非金属介在物が付着するのを最小限に抑えることができることを意味する。
As shown in FIG. 3, in the conventional example in which the
以上のように、アルミニウム溶湯用取鍋１２をバーナー２４の火炎３０で予熱する際に、その火炎３０を予熱管２６で囲繞する本発明の予熱方法及び予熱装置１０によれば、アルミニウム溶湯用取鍋１２を繰り返し予熱して使用しても当該取鍋１２の有効容積の減少を最小限に抑えることができると共に、非金属介在物による溶湯の汚染も低減させることができる。
As described above, according to the preheating method and the preheating
なお、上述の図示実施形態では、予熱管２６の排気孔２６ｂを予熱管２６の下端側に設ける場合を示したが、この排気孔２６ｂの位置はこれに限定されるものではなく、例えば図示しないが、この排気孔を予熱管上部のバーナーに近接する位置に設けるようにしてもよい。この場合、排気孔から排出される高温の燃焼排ガスとバーナーに供給する燃焼用空気との間で熱交換させるようにしてもよい。
In the illustrated embodiment described above, the
また、上述の図示実施形態では、予熱管２６としてストレートな直管状のものを用いる場合を示したが、この予熱管２６は、バーナー２４の火炎３０を囲繞する形状であれば如何なるものであってもよく、例えば、円管の途中に設けられた段部を介してその下側の外径及び内径が拡大或いは縮小するような形状のものであってもよい。
In the illustrated embodiment described above, a straight straight tube is used as the preheating
さらに、予熱装置１０の駆動機構２８として、左右一対のアーム３４と、水平棹３６と、昇降装置のフック３８が取付けられる吊り金具４０と、左右一対の垂下アーム４２とで構成される場合を示したが、この駆動機構２８は、バーナー２４及びこれに連結された予熱管２６を所定の動線に沿って上下駆動させることができるものであれば如何なる態様であってもよく、上記のものに限定されるものではない。
Furthermore, as the
Claims (2)
上記の火炎(３０)を耐熱性の金属薄板材からなる予熱管(２６)で囲繞することを特徴とするアルミニウム溶湯用取鍋(１２)の予熱方法。 A molten aluminum ladle (12) for preheating the inside of the ladle (12) by a flame (30) injected from a burner (24) attached to the opening (16) of the molten aluminum ladle (12) In the preheating method,
A method for preheating an aluminum ladle (12), characterized in that the flame (30) is surrounded by a preheating pipe (26) made of a heat-resistant sheet metal material.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2013/006196 WO2015056287A1 (en) | 2013-10-18 | 2013-10-18 | Preheating method for ladle for molten aluminum and preheating device |
| JP2015542418A JPWO2015056287A1 (en) | 2013-10-18 | 2013-10-18 | Preheating method and preheating device for ladle for molten aluminum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2013/006196 WO2015056287A1 (en) | 2013-10-18 | 2013-10-18 | Preheating method for ladle for molten aluminum and preheating device |
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| WO2015056287A1 true WO2015056287A1 (en) | 2015-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2013/006196 Ceased WO2015056287A1 (en) | 2013-10-18 | 2013-10-18 | Preheating method for ladle for molten aluminum and preheating device |
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| WO (1) | WO2015056287A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01300104A (en) * | 1988-05-27 | 1989-12-04 | Toho Gas Co Ltd | Pulse combustion immersion burner |
| JPH03469A (en) * | 1989-05-24 | 1991-01-07 | Tokyo Gas Co Ltd | Holding furnace for molten aluminum |
| JPH08157978A (en) * | 1994-12-03 | 1996-06-18 | Osaka Gas Co Ltd | Reaction type aluminum holding furnace |
| JP2001355972A (en) * | 2000-06-16 | 2001-12-26 | Kubota Corp | Double structure protection tube of immersion type burner heater for metal melting / holding furnace |
| WO2002051740A1 (en) * | 2000-12-27 | 2002-07-04 | Hoei Shokai Co., Ltd | Container |
| JP2004160523A (en) * | 2002-11-15 | 2004-06-10 | Teruo Kaminari | Device and method for heating vessel |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0410218U (en) * | 1990-04-27 | 1992-01-29 | ||
| JP6218487B2 (en) * | 2013-08-07 | 2017-10-25 | 日精オーバル株式会社 | Tribe preheater |
-
2013
- 2013-10-18 JP JP2015542418A patent/JPWO2015056287A1/en active Pending
- 2013-10-18 WO PCT/JP2013/006196 patent/WO2015056287A1/en not_active Ceased
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01300104A (en) * | 1988-05-27 | 1989-12-04 | Toho Gas Co Ltd | Pulse combustion immersion burner |
| JPH03469A (en) * | 1989-05-24 | 1991-01-07 | Tokyo Gas Co Ltd | Holding furnace for molten aluminum |
| JPH08157978A (en) * | 1994-12-03 | 1996-06-18 | Osaka Gas Co Ltd | Reaction type aluminum holding furnace |
| JP2001355972A (en) * | 2000-06-16 | 2001-12-26 | Kubota Corp | Double structure protection tube of immersion type burner heater for metal melting / holding furnace |
| WO2002051740A1 (en) * | 2000-12-27 | 2002-07-04 | Hoei Shokai Co., Ltd | Container |
| JP2004160523A (en) * | 2002-11-15 | 2004-06-10 | Teruo Kaminari | Device and method for heating vessel |
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| Publication number | Publication date |
|---|---|
| JPWO2015056287A1 (en) | 2017-03-09 |
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