JP3337569B2 - Nonferrous metal melting and holding furnace and nonferrous metal melting and holding furnace - Google Patents
Nonferrous metal melting and holding furnace and nonferrous metal melting and holding furnaceInfo
- Publication number
- JP3337569B2 JP3337569B2 JP24935594A JP24935594A JP3337569B2 JP 3337569 B2 JP3337569 B2 JP 3337569B2 JP 24935594 A JP24935594 A JP 24935594A JP 24935594 A JP24935594 A JP 24935594A JP 3337569 B2 JP3337569 B2 JP 3337569B2
- Authority
- JP
- Japan
- Prior art keywords
- crucible
- graphite crucible
- burner
- flame
- furnace
- 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
Description
【０００１】[0001]
【産業上の利用分野】本発明は非鉄金属溶解保持炉およ
び非鉄金属溶湯保持炉に関し、とくにその加熱構造に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-ferrous metal melting and holding furnace and a non-ferrous metal melting and holding furnace, and more particularly to a heating structure thereof.
【０００２】[0002]
【従来の技術】従来の非鉄金属（たとえば、アルミ合
金、以下同じ）溶解保持炉は、たとえば特開平１−２１
０７９４号公報に示されているように、ルツボと、それ
を支持する支持台と、ルツボおよび支持台をとり囲む炉
体と、バーナと、排気の排出口を備えている。従来の非
鉄金属溶湯保持炉も、ほぼ同じ構造で、黒鉛ルツボおよ
びそれを懸吊支持する鉄ルツボと、鉄ルツボを支持する
炉体と、バーナと、排気の排出口を備えている。そし
て、従来の非鉄金属溶解保持炉および非鉄金属溶湯保持
炉では、バーナおよび排気排出口は、ルツボを上下方向
にできるだけ均一に加熱するように、位置および火炎噴
射方向が設定されていた。たとえば、上記特開平１−２
１０７９４号公報では、炉体の下部から火炎を炉体内周
方向に噴射し、燃焼ガスをルツボまわりに旋回させなが
ら上方に導き、炉体上部から高温排気を取り出して、ル
ツボを上下方向全長にわたって、できるだけ高温に加熱
するように設定されていた。2. Description of the Related Art A conventional nonferrous metal (for example, aluminum alloy, hereinafter the same) melting and holding furnace is disclosed in
As shown in Japanese Patent No. 0794, a crucible, a support for supporting the crucible, a furnace body surrounding the crucible and the support, a burner, and an exhaust outlet are provided. The conventional non-ferrous metal melt holding furnace has substantially the same structure, and includes a graphite crucible, an iron crucible for suspending and supporting the same, a furnace for supporting the iron crucible, a burner, and an exhaust outlet. In the conventional non-ferrous metal melting and holding furnace and the non-ferrous metal melting and holding furnace, the position and the flame injection direction of the burner and the exhaust outlet are set so as to heat the crucible up and down as uniformly as possible. For example, Japanese Unexamined Patent Application Publication No.
In Japanese Patent No. 10794, a flame is injected from the lower part of the furnace body in the circumferential direction of the furnace body, the combustion gas is guided upward while swirling around the crucible, high-temperature exhaust gas is taken out from the upper part of the furnace body, and the crucible is moved over the entire length in the vertical direction. It was set to heat as high as possible.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の技術に
は次の問題がある。 燃焼ガス温度（約９００℃以上）に近い温度に黒鉛
ルツボが全長にわたって加熱されるため、特に溶湯が入
っていない部分のルツボ内面の酸化が激しく、ルツボが
酸化割れを起こし易い。 ルツボを全長にわたって均一加熱すると、ルツボ内
部の溶湯に上下でかなり大きな温度差が生じる。 本発明の目的は、黒鉛ルツボの溶湯より上方の部分の温
度を低減して酸化割れを防止できる非鉄金属溶解保持炉
および非鉄金属溶湯保持炉を提供することにある。However, the prior art has the following problems. Since the graphite crucible is heated over the entire length to a temperature close to the combustion gas temperature (about 900 ° C. or higher), the inner surface of the crucible especially where no molten metal is contained is highly oxidized, and the crucible is liable to be oxidized and cracked. When the crucible is heated uniformly over the entire length, a considerable temperature difference is generated between the upper and lower parts of the molten metal in the crucible. An object of the present invention is to provide a non-ferrous metal melting and holding furnace and a non-ferrous metal melting and holding furnace that can reduce the temperature of a portion of the graphite crucible above the molten metal and prevent oxidation cracking.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成する本発
明は次の通りである。 （１） 黒鉛ルツボと、 該黒鉛ルツボを黒鉛ルツボ下部にて支持する支持台と、
前記黒鉛ルツボおよび前記支持台をとり囲む炉体と、該
炉体に取り付けられ炉体内に火炎を噴射するバーナと、
を備えた非鉄金属溶解保持炉において、前記バーナの取
り付け位置および火炎噴射方向を、前記黒鉛ルツボより
下方に設定し、火炎を前記黒鉛ルツボより下方に位置さ
せるとともに、排気口位置も前記黒鉛ルツボより下方に
設定したことを特徴とする非鉄金属溶解保持炉。 （２） 黒鉛ルツボと、 該黒鉛ルツボを取り巻いて懸吊する鉄ルツボと、該鉄ル
ツボをとり囲み該鉄ルツボを鉄ルツボ上部にて支持する
炉体と、該炉体に取り付けられ炉体内に火炎を噴射する
バーナと、を備えた非鉄金属溶湯保持炉において、前記
バーナの取り付け位置および火炎噴射方向を、前記鉄ル
ツボより下方に設定し、火炎を前記鉄ルツボより下方に
位置させるとともに、排気口位置も前記鉄ルツボより下
方に設定したことを特徴とする非鉄金属溶湯保持炉。The present invention for achieving the above object is as follows. (1) a graphite crucible, a support for supporting the graphite crucible under the graphite crucible,
A furnace body surrounding the graphite crucible and the support, and a burner attached to the furnace body and injecting a flame into the furnace body,
In the non-ferrous metal melting and holding furnace provided with the above, the mounting position of the burner and the flame injection direction are set below the graphite crucible , and the flame is positioned below the graphite crucible.
Was Rutotomoni, non-ferrous metal melting holding furnace, characterized in that also the exhaust port position was set lower than the graphite crucible. (2) a graphite crucible, an iron crucible surrounding and suspending the graphite crucible, a furnace body surrounding the iron crucible and supporting the iron crucible at an upper portion of the iron crucible, and a furnace body attached to the furnace body and installed in the furnace body. And a burner that injects a flame, in a non-ferrous metal melt holding furnace provided with: a mounting position and a flame injection direction of the burner are set below the iron crucible, and the flame is placed below the iron crucible.
Position is allowed Rutotomoni, non-ferrous metal melt holding furnace, characterized in that also the exhaust port position was set lower than the iron crucible.
【０００５】[0005]
【作用】上記（１）の非鉄金属溶解保持炉では、火炎が
黒鉛ルツボより下方に位置し、排気口も黒鉛ルツボより
下方に位置するため、炉内は下部で高温になり、上部は
下部に比べて低温となる。したがって、黒鉛ルツボは黒
鉛ルツボ下部で加熱され、黒鉛ルツボ上部は黒鉛ルツボ
下部程には加熱されない。このため、黒鉛ルツボの溶湯
より上部（溶湯と接触する部分は溶湯とほぼ同じ温度に
なる）の高温での酸化（主にルツボ内側の酸素を含む空
気による酸化）が抑制される。また、溶湯は下部で加熱
されるので、自然対流によって上下が攪拌され、上下方
向にほぼ均一の温度になる。このため、黒鉛ルツボに生
じる熱応力も抑制される。上記（２）の非鉄金属溶湯保
持炉では、火炎が鉄ルツボより下方に位置し、排気口も
鉄ルツボより下方に位置するため、炉内は下部で高温に
なり、上部は下部に比べて低温となる。したがって、黒
鉛ルツボは鉄ルツボを通して黒鉛ルツボ下部で加熱さ
れ、黒鉛ルツボ上部は黒鉛ルツボ下部程には加熱されな
い。このため、黒鉛ルツボの溶湯より上部の高温での酸
化（ルツボ内側の酸素を含む空気による酸化）が抑制さ
れる。また、溶湯は下部で加熱されるので、自然対流に
よって上下が攪拌され、上下方向にほぼ均一の温度にな
る。In the non-ferrous metal melting and holding furnace of the above (1), the flame is located below the graphite crucible, and the exhaust port is also located below the graphite crucible. The temperature is lower than that. Therefore, the graphite crucible is heated at the lower part of the graphite crucible, and the upper part of the graphite crucible is not heated as much as the lower part of the graphite crucible. For this reason, oxidation at a high temperature above the molten metal of the graphite crucible (a portion in contact with the molten metal is almost the same as the molten metal) at a high temperature (mainly oxidation by air containing oxygen inside the crucible) is suppressed. Also, since the molten metal is heated at the lower part, the upper and lower parts are stirred by natural convection, and the temperature becomes substantially uniform in the vertical direction. Therefore, the thermal stress generated in the graphite crucible is also suppressed. In the non-ferrous metal melt holding furnace of the above (2), the flame is located below the iron crucible, and the exhaust port is also located below the iron crucible. Becomes Therefore, the graphite crucible is heated at the lower part of the graphite crucible through the iron crucible, and the upper part of the graphite crucible is not heated as much as the lower part of the graphite crucible. For this reason, oxidation of graphite crucible at a high temperature above the molten metal (oxidation by oxygen-containing air inside the crucible) is suppressed. Also, since the molten metal is heated at the lower part, the upper and lower parts are stirred by natural convection, and the temperature becomes substantially uniform in the vertical direction.
【０００６】[0006]
【実施例】図１〜図４は本発明の第１発明である非鉄金
属溶解保持炉を示し、そのうち図１、図２は第１発明の
第１実施例を、図３、図４は第１発明の第２実施例を示
す。また、図５、図６は本発明の第２発明である非鉄金
属溶湯保持炉を示す。図７は何れの発明にも適用可能な
バーナで、とくに連続蓄熱燃焼用バーナを示している。
全ての発明について共通な構成部分には、同じ符号を付
してある。1 to 4 show a non-ferrous metal melting and holding furnace according to a first embodiment of the present invention, of which FIGS. 1 and 2 show a first embodiment of the first invention, and FIGS. 1 shows a second embodiment of the invention. 5 and 6 show a non-ferrous metal melt holding furnace according to a second invention of the present invention. FIG. 7 shows a burner applicable to any of the inventions, particularly a burner for continuous heat storage combustion.
Components common to all the inventions are denoted by the same reference numerals.
【０００７】まず、第１発明の非鉄金属溶解保持炉１０
において、第１、第２実施例に共通な構成を説明する。
非鉄金属溶解保持炉１０は、黒鉛ルツボ１と、黒鉛ルツ
ボ１を下部（底部）にて支持する支持台２と、黒鉛ルツ
ボ１と支持台２をとり囲む炉体４と、炉体４に取り付け
られ、炉体４内に火炎を噴射するバーナ５とを備えてい
る。バーナ５の炉体４への取り付け位置は黒鉛ルツボ１
より下方にあり、火炎噴射方向も黒鉛ルツボ１より下方
に向けられている。したがって、火炎は黒鉛ルツボ１に
直接あたらない。バーナ５自体または炉体４には、排気
口６が設けられているが、排気口６も黒鉛ルツボ１より
下方に位置している。バーナ５には図７に示すような連
続蓄熱燃焼用バーナを用いることが望ましいが、それに
限るものではなく従来バーナを用いてもよい。First, the nonferrous metal melting and holding furnace 10 of the first invention
In the following, a configuration common to the first and second embodiments will be described.
The non-ferrous metal melting and holding furnace 10 is attached to a graphite crucible 1, a support 2 for supporting the graphite crucible 1 at a lower portion (bottom), a furnace 4 surrounding the graphite crucible 1 and the support 2, and attached to the furnace 4. And a burner 5 for injecting a flame into the furnace body 4. The mounting position of the burner 5 to the furnace body 4 is the graphite crucible 1
The flame spray direction is also directed downward from the graphite crucible 1. Therefore, the flame does not directly hit the graphite crucible 1. An exhaust port 6 is provided in the burner 5 itself or the furnace body 4, and the exhaust port 6 is also located below the graphite crucible 1. As the burner 5, it is desirable to use a burner for continuous heat storage combustion as shown in FIG. 7, but it is not limited to this, and a conventional burner may be used.
【０００８】連続蓄熱燃焼用バーナ５は、図７に示すよ
うに、燃料とパイロット空気を噴射する燃料噴射ノズル
５１と、燃料噴射ノズル５１の囲りをとり囲み隔壁６３
に周方向に複数に分割されたセラミックハニカムからな
る蓄熱体５２と、軸芯まわりに回転可能とされた回転デ
ィスク５３と、回転ディスク５３にあけられた給気通気
用開口部６０および排気通気用開口部６１と、給排気面
に開口された通気孔からなる給気孔５５および排気孔５
６と、給排気面から炉体に突出する突出部５４と、蓄熱
体５２および回転ディスク５３を一体に内部に組み付け
た枠体６２とからなる。ブロワ５７またはコンプレッサ
は給気通路５８を介して給気を給気通気用開口部６０へ
送り、排気通気用開口部６１からの排気は排気通路５９
を介して大気に放出される。排気通路５９の途中にはド
レン弁６２を設けて水がたまった場合抜くことができる
ようになっている。排気が蓄熱体５２を通過するときに
蓄熱体５２に排気を蓄熱し、給排をディスク５３の回転
によって切替えた後、給気を蓄熱体５２に通して給気を
温める。たとえば約２０℃であった給気は蓄熱体５２に
よって温められ、蓄熱体５２を通過して給気孔５５から
噴出されるときにはたとえばたとえば約９００℃の燃焼
空気となり、炉内から排気孔５６に排出される時はたと
えば約１０００℃となり、蓄熱体５２を通過するときに
蓄熱体５２を温め自身は温度が下ってたとえば約２００
℃となり、大気に放出される。連続蓄熱燃焼用バーナ５
のようにバーナ自体が排気孔５６を持つものは、炉体４
に排気口６を設けなくてよい。ただし、排気孔５６は黒
鉛ルツボ１より下方になければならない。As shown in FIG. 7, the burner 5 for continuous heat storage combustion includes a fuel injection nozzle 51 for injecting fuel and pilot air, and a partition 63 surrounding the fuel injection nozzle 51.
A heat storage body 52 made of a ceramic honeycomb divided into a plurality of pieces in the circumferential direction, a rotating disk 53 rotatable around the axis, an air supply opening 60 and an exhaust air opening formed in the rotating disk 53. An opening 61, and an air supply hole 55 and an air exhaust hole 5, each of which is composed of a vent hole opened on the air supply and exhaust surface.
6, a projecting portion 54 projecting from the air supply / exhaust surface to the furnace body, and a frame 62 in which the heat storage body 52 and the rotating disk 53 are integrally assembled. The blower 57 or the compressor sends the air supply to the air supply opening 60 through the air supply passage 58, and the exhaust air from the exhaust air opening 61 is discharged to the exhaust passage 59.
Is released to the atmosphere through A drain valve 62 is provided in the middle of the exhaust passage 59 so that water can be drained when accumulated. When the exhaust gas passes through the heat accumulator 52, the heat is stored in the heat accumulator 52, and after the supply and discharge are switched by the rotation of the disk 53, the air supply is passed through the heat accumulator 52 to warm the air supply. For example, the supply air having a temperature of about 20 ° C. is heated by the heat storage element 52, and when the supply air is ejected from the air supply hole 55 through the heat storage element 52, for example, becomes combustion air of about 900 ° C. For example, when the temperature is lowered to about 1000 ° C., the temperature of the heat accumulator 52 is increased when the heat accumulator 52 is passed through the heat accumulator 52, and the temperature of the heat accumulator 52 decreases by about 200
° C and is released to the atmosphere. Burner 5 for continuous heat storage combustion
The burner itself has an exhaust hole 56 as shown in FIG.
The exhaust port 6 need not be provided. However, the exhaust hole 56 must be below the graphite crucible 1.
【０００９】つぎに、第１発明の各実施例に特有な構成
を説明する。第１発明の第１実施例においては、図１、
図２に示すように、バーナ５の火炎噴射方向が黒鉛ルツ
ボ１の直下で炉体４の円形の中心に向けられている。支
持台２は平行な２本の脚部２ａ、２ｂを有し、２本の脚
部２ａ、２ｂの間の空間は火炎噴射方向につつ抜けにな
っている。したがって、火炎は２本の脚部２ａ、２ｂの
間を通り抜けてさらに直進する。炉体４の内壁面の、バ
ーナ５と炉体直径方向に対向する位置に、ガス流分配台
座７が取り付けられている。ガス流分配台座７は、中央
部がバーナ５に向かって突出する中央突出部７ａを形成
している。この中央突出部７ａは上下に延びており、バ
ーナ５からの火炎および燃焼流を左右に２分して、各々
を炉体４の内壁面に沿わせてバーナ５方向に還流させ
る。バーナ５に複数の給気孔５５、排気孔５６が設けら
れる場合は、ガス流分配台座７の中央突出部７ａに対し
て左右に対称となる位置に設けられて、燃焼流を突出部
７ａに対して左右対称に当てるようにする。たとえば、
給気孔５５が２個、排気孔５６が２個設けられる場合
は、２個の給気孔５５と２個の排気孔５６は水平に延び
る２辺と鉛直に延びる２辺をもつ正方形の角に設けら
れ、ガス流分配台座７の中央突出部７ａはこの正方形を
ガス流分配台座７に投影したときの正方形の中心を通過
して上下方向に延びる位置関係とされる。Next, a configuration specific to each embodiment of the first invention will be described. In the first embodiment of the first invention, FIG.
As shown in FIG. 2, the flame injection direction of the burner 5 is directed to the circular center of the furnace body 4 immediately below the graphite crucible 1. The support base 2 has two parallel legs 2a and 2b, and a space between the two legs 2a and 2b extends in the flame injection direction. Therefore, the flame passes between the two legs 2a and 2b and travels further straight. The gas flow distribution pedestal 7 is attached to the inner wall surface of the furnace body 4 at a position facing the burner 5 in the furnace body diameter direction. The gas flow distribution pedestal 7 has a central protruding portion 7 a whose central portion protrudes toward the burner 5. The central protruding portion 7a extends vertically, divides the flame and the combustion flow from the burner 5 into two right and left sides, and recirculates the flame and the combustion flow toward the burner 5 along the inner wall surface of the furnace body 4. When the burner 5 is provided with a plurality of air supply holes 55 and exhaust holes 56, the burner 5 is provided at a position symmetrical to the left and right with respect to the central projection 7a of the gas flow distribution pedestal 7 so that the combustion flow is Symmetrically. For example,
When two air supply holes 55 and two exhaust holes 56 are provided, the two air supply holes 55 and the two exhaust holes 56 are provided at corners of a square having two sides extending horizontally and two sides extending vertically. The central projecting portion 7a of the gas flow distribution pedestal 7 has a positional relationship extending vertically through the center of the square when this square is projected onto the gas flow distribution pedestal 7.
【００１０】第１発明の第２実施例においては、図３、
図４に示すように、バーナ５の火炎噴射方向が炉体４の
内部の円形状の空間に対して接線方向に向けられてお
り、かつ水平に向けられている。この場合の燃焼流は炉
体内の下部で旋回流を形成する。In a second embodiment of the first invention, FIG.
As shown in FIG. 4, the flame injection direction of the burner 5 is directed tangentially to the circular space inside the furnace body 4 and is directed horizontally. The combustion flow in this case forms a swirling flow in the lower part of the furnace body.
【００１１】つぎに、第１発明の各実施例に共通な作用
を説明する。バーナ５からの火炎が黒鉛ルツボ１より下
方にあるので、黒鉛ルツボ１はその底部が、高温の燃焼
ガスと火炎からのガスふく射と対流とによって外部から
加熱され、約９００℃〜１０００℃になる。しかし、高
温ガスが炉上部に旋回しないので炉体４内の上部は炉体
４の下部に比べて低温、たとえば約７００℃になり、黒
鉛ルツボ１のうち溶湯面変動領域より上方の部分は約７
００℃となる。炉体４内は排気ガスで充満しているの
で、酸素はほとんどなく、ＣＯ2 、Ｈ2 Ｏが存在するＯ
2 リーン雰囲気にある。しかし、黒鉛ルツボ１の内部は
空気があり、黒鉛ルツボ１が高温になれば酸化が進行す
る。従来のように黒鉛ルツボ全長を約９００℃〜１００
０℃に加熱する場合は黒鉛ルツボの高温酸化の進行が無
視できない程度になり、酸化割れも生じていた。しか
し、上記のように従来に比べて約２００℃も黒鉛ルツボ
１の温度が低下すると、その高温酸化は大幅に抑制さ
れ、酸化割れが生じにくい。また、黒鉛ルツボ１は黒鉛
ルツボ下部にて加熱されるので黒鉛ルツボ１内の溶湯
（たとえば、アルミ合金）は下部から加熱され、対流に
よって溶湯が攪拌されて、溶湯全体がほぼ均一な温度に
なる。これによって湯温変動に対するレスポンスが向上
するため、溶湯温度抑制も精度が高くなり、従来の目標
温度±約１０℃が目標温度±約５℃となる。排気孔５６
から排出されるガスは燃料の燃焼によって生じたＣ
Ｏ2 、Ｈ2 Ｏを多量含み、そのうちＨ2 Ｏは排気通路５
９で１００℃以下になると結露するが、ドレン弁６２が
あるので排気通路５９中に水がたまった場合抜くことが
できる。排気ガス中にＣＯを含む場合は、蓄熱体５２に
酸化触媒を担持させることによりＣＯ2 に酸化して無害
化できる。また、連続蓄熱燃焼バーナ５を用いると排気
温度が低くなり、従来の、高温ガスをそのまま排出して
いた場合に比べて熱効率が大幅に改善される。Next, the operation common to the embodiments of the first invention will be described. Since the flame from the burner 5 is below the graphite crucible 1, the bottom of the graphite crucible 1 is externally heated by high-temperature combustion gas, gas radiation from the flame and convection, and reaches about 900 ° C. to 1000 ° C. . However, since the high-temperature gas does not swirl to the upper part of the furnace, the upper part in the furnace body 4 has a lower temperature, for example, about 700 ° C. than the lower part of the furnace body 4, and the portion of the graphite crucible 1 above the melt surface fluctuation region is about 7
It will be 00 ° C. Since the inside of the furnace body 4 is filled with exhaust gas, there is almost no oxygen, and O 2 containing CO 2 and H 2 O is present.
2 Lean atmosphere. However, there is air inside the graphite crucible 1, and when the temperature of the graphite crucible 1 becomes high, oxidation proceeds. The total length of graphite crucible is about 900 ° C ~ 100
When heating to 0 ° C., the progress of the high-temperature oxidation of the graphite crucible was not negligible, and oxidative cracking had also occurred. However, as described above, when the temperature of the graphite crucible 1 is reduced by about 200 ° C. as compared with the related art, the high-temperature oxidation is greatly suppressed, and oxidation cracks are less likely to occur. Further, since the graphite crucible 1 is heated at the lower portion of the graphite crucible, the molten metal (for example, aluminum alloy) in the graphite crucible 1 is heated from the lower portion, and the molten metal is stirred by convection, so that the entire molten metal has a substantially uniform temperature. . As a result, the response to the fluctuation of the hot water temperature is improved, so that the precision of controlling the temperature of the molten metal is also increased, and the conventional target temperature of about ± 10 ° C. becomes the target temperature of about ± 5 ° C. Exhaust hole 56
The gas discharged from the fuel is C
It contains a large amount of O 2 and H 2 O, of which H 2 O
When the temperature falls below 100 ° C. in 9, dew condensation occurs. However, since water is accumulated in the exhaust passage 59 due to the presence of the drain valve 62, it can be drained. When CO is contained in the exhaust gas, the regenerator 52 is oxidized to CO 2 by carrying an oxidation catalyst on the regenerator 52 and can be rendered harmless. Further, when the continuous heat storage combustion burner 5 is used, the exhaust gas temperature is lowered, and the thermal efficiency is greatly improved as compared with the conventional case where the high-temperature gas is directly discharged.
【００１２】第１発明の各実施例に特有な作用について
説明する。第１発明の第１実施例については、火炎が黒
鉛ルツボ１の直下を通過するので、黒鉛ルツボ１は底面
を火炎からのガスふく射と対流によって加熱される。ま
た、燃焼ガスはガス流分配台座７の突出部７ａで左右に
２等分されて、各々左右の炉体内壁面に沿ってバーナ５
方向に還流し、一部はバーナ５の排気孔５６から排出さ
れ、残りは燃焼ガスに随伴して再びガス流分配台座７に
向かって流れる。An operation unique to each embodiment of the first invention will be described. In the first embodiment of the first invention, since the flame passes just below the graphite crucible 1, the graphite crucible 1 is heated on the bottom surface by gas radiation from the flame and convection. Further, the combustion gas is divided into two equal parts at the projecting part 7a of the gas flow distribution pedestal 7 at right and left sides, and burners 5 are respectively formed along the left and right inner wall surfaces of the furnace.
Then, a part of the gas is discharged from the exhaust hole 56 of the burner 5, and the remainder flows toward the gas flow distribution pedestal 7 again with the combustion gas.
【００１３】第１発明の第２実施例の作用については、
火炎および燃焼ガスが炉底部を旋回するので、黒鉛ルツ
ボ１は斜め下方から、全周にわたってほぼ均一に、ガス
ふく射および対流によって、加熱される。Regarding the operation of the second embodiment of the first invention,
Since the flame and the combustion gas swirl around the bottom of the furnace, the graphite crucible 1 is heated almost uniformly over the entire circumference from obliquely below by gas radiation and convection.
【００１４】次に、本発明の第２発明の非鉄金属溶湯保
持炉２０の構成を説明する。非鉄金属溶湯保持炉２０
は、図５、図６に示すように、黒鉛ルツボ１と、黒鉛ル
ツボ１を取り巻いて懸吊する鉄ルツボ３と、鉄ルツボ３
をとり囲み鉄ルツボ３を鉄ルツボ上部にて支持する炉体
４と、炉体４に取り付けられ炉体４内に火炎を噴射する
バーナ５とを備えている。バーナ５の炉体４への取り付
け位置は鉄ルツボ３より下方にあり、火炎噴射方向も鉄
ルツボ３より下方に向けられている。バーナ５自体また
は炉体４には、排気口６が設けられているが、排気口６
も鉄ルツボ３より下方に位置している。バーナ５には図
７に示したような連続蓄熱燃焼用バーナを用いることが
望ましいが、それに限るものではなく従来バーナを用い
てもよい。鉄ルツボ３の下方には支持台はない。炉体４
の内壁面のうち、バーナ５に炉体直径方向に対向する部
位には、ガス流分配台座７が設けられている。ガス流分
配台座７は、中央に、上下方向に延びる、バーナ５に向
かって突出した突出部７ａを有し、バーナ５からの火
炎、燃焼流を左右に均等に分配する。炉体４の内壁に
は、鉄ルツボ３の側方に電気ヒータ８が設けられてい
る。ただし、電気ヒータ８は必須のものではない。Next, the configuration of the nonferrous metal molten metal holding furnace 20 according to the second invention of the present invention will be described. Nonferrous metal melt holding furnace 20
As shown in FIGS. 5 and 6, a graphite crucible 1, an iron crucible 3 surrounding and suspending the graphite crucible 1, and an iron crucible 3 are provided.
And a furnace 4 for supporting the iron crucible 3 above the iron crucible and a burner 5 attached to the furnace 4 for injecting a flame into the furnace 4. The position where the burner 5 is attached to the furnace body 4 is below the iron crucible 3, and the flame injection direction is also directed below the iron crucible 3. The burner 5 itself or the furnace body 4 is provided with an exhaust port 6.
Is also located below the iron crucible 3. It is desirable to use a burner for continuous heat storage combustion as shown in FIG. 7 as the burner 5, but the burner 5 is not limited to this and a conventional burner may be used. There is no support below the iron crucible 3. Furnace body 4
A gas flow distribution pedestal 7 is provided on a portion of the inner wall surface facing the burner 5 in the furnace body diameter direction. The gas flow distribution pedestal 7 has, at the center, a protruding portion 7a extending vertically and protruding toward the burner 5, and distributes the flame and the combustion flow from the burner 5 equally to the left and right. An electric heater 8 is provided on the inner wall of the furnace body 4 beside the iron crucible 3. However, the electric heater 8 is not essential.
【００１５】第２発明の作用を説明する。バーナ５から
の火炎、燃焼ガスは鉄ルツボ３直下を通過し、鉄ルツボ
３は底面をガスふく射および対流によって加熱される。
黒鉛ルツボ１は鉄ルツボ３からの熱伝導によって加熱さ
れる。黒鉛ルツボ１および鉄ルツボ３は、下部を加熱さ
れるので、上部の、溶湯面変動領域より上の部分の温度
は、下部よりたとえば約２００℃低い。このため、黒鉛
ルツボ１の、ルツボ内空気の酸素による、高温酸化が抑
えられ、黒鉛ルツボ１の酸化割れも防止される。黒鉛ル
ツボ１内の溶湯は下部にて加熱され、自然対流を生じて
攪拌されるので、上下の温度差も生じにくくなり、全体
がほぼ均一な温度となる。従来の電気ヒータのみによる
ルツボ側面加熱においては、溶湯温度を目標温度±約１
０℃にしか抑制できなかったが、本発明では目標温度±
約５℃に抑制できる。また、連続蓄熱燃焼バーナ５を用
いると熱効率が上るのは第１発明で説明したことと同じ
である。The operation of the second invention will be described. The flame and combustion gas from the burner 5 pass immediately below the iron crucible 3, and the bottom of the iron crucible 3 is heated by gas radiation and convection.
The graphite crucible 1 is heated by heat conduction from the iron crucible 3. Since the graphite crucible 1 and the iron crucible 3 are heated at the lower part, the temperature of the upper part above the molten metal surface fluctuation region is, for example, about 200 ° C. lower than that of the lower part. Therefore, high-temperature oxidation of the graphite crucible 1 due to oxygen in the air in the crucible is suppressed, and oxidative cracking of the graphite crucible 1 is also prevented. The molten metal in the graphite crucible 1 is heated at the lower part and generates natural convection and is agitated, so that a temperature difference between the upper and lower parts is less likely to occur, and the whole temperature is substantially uniform. In conventional crucible side heating using only an electric heater, the temperature of the molten metal is set to a target temperature ± about 1
Although it could only be suppressed to 0 ° C., in the present invention, the target temperature ±
It can be suppressed to about 5 ° C. Further, the use of the continuous heat storage combustion burner 5 increases the thermal efficiency, as described in the first invention.
【００１６】[0016]
【発明の効果】請求項１の非鉄金属溶解保持炉によれ
ば、バーナからの火炎が黒鉛ルツボより下方にあるの
で、黒鉛ルツボは、下部を加熱され、黒鉛ルツボ上部
の、溶湯より上にある部分の温度を、下部より下げるこ
とができ、黒鉛ルツボの高温での酸化とそれによる割れ
の発生を防止できる。請求項２の非鉄金属溶湯保持炉に
よれば、バーナからの火炎が鉄ルツボより下方にあるの
で、鉄ルツボは下部を加熱され、それに合わせて黒鉛ル
ツボも下部にて加熱され、黒鉛ルツボの、溶湯より上に
ある部分の温度を、下部より下げることができ、黒鉛ル
ツボの高温での酸化とそれによる割れの発生を防止でき
る。According to the non-ferrous metal melting and holding furnace of the present invention, since the flame from the burner is below the graphite crucible, the lower part of the graphite crucible is heated and the upper part of the graphite crucible is above the molten metal. The temperature of the portion can be made lower than that of the lower portion, and the oxidation of the graphite crucible at a high temperature and the occurrence of cracks due to the oxidation can be prevented. According to the non-ferrous metal molten metal holding furnace of claim 2, since the flame from the burner is below the iron crucible, the lower part of the iron crucible is heated, and accordingly, the graphite crucible is also heated at the lower part. The temperature of the portion above the molten metal can be made lower than that of the lower portion, and the oxidation of the graphite crucible at a high temperature and the occurrence of cracks due to the oxidation can be prevented.
【図１】本発明の第１発明の第１実施例に係る非鉄金属
溶解保持炉の平面図である。FIG. 1 is a plan view of a nonferrous metal melting and holding furnace according to a first embodiment of the first invention of the present invention.
【図２】図１の断面図である。FIG. 2 is a sectional view of FIG.
【図３】本発明の第１発明の第２実施例に係る非鉄金属
溶解保持炉の平面図である。FIG. 3 is a plan view of a nonferrous metal melting and holding furnace according to a second embodiment of the first invention of the present invention.
【図４】図３の断面図である。FIG. 4 is a sectional view of FIG. 3;
【図５】本発明の第２発明に係る非鉄金属溶湯保持炉の
平面図である。FIG. 5 is a plan view of a furnace for holding molten non-ferrous metal according to a second invention of the present invention.
【図６】図５の平面図である。FIG. 6 is a plan view of FIG. 5;
【図７】連続蓄熱燃焼用バーナとその配管の概略系統図
である。FIG. 7 is a schematic system diagram of a burner for continuous heat storage combustion and piping thereof.
１ 黒鉛ルツボ ２ 支持台 ３ 鉄ルツボ ４ 炉体 ５ バーナ ６ 排気口 ７ ガス流分配台座 Reference Signs List 1 graphite crucible 2 support base 3 iron crucible 4 furnace body 5 burner 6 exhaust port 7 gas flow distribution pedestal
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 良一 神奈川県横浜市鶴見区尻手２丁目１番53 号 日本ファーネス工業株式会社内 (56)参考文献 特開 昭61−153377（ＪＰ，Ａ) 実開 平１−63997（ＪＰ，Ｕ) 実開 昭62−93692（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F27B 14/14 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Ryoichi Tanaka, Inventor Japan Furness Industry Co., Ltd. 2-1-153 Shirite, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture (56) References JP-A-61-153377 (JP, A) 1-63997, Kaihei (JP, U) Actually, Sho 62-93692 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) F27B 14/14
Claims (2)
と、 を備えた非鉄金属溶解保持炉において、 前記バーナの取り付け位置および火炎噴射方向を、前記
黒鉛ルツボより下方に設定し、火炎を前記黒鉛ルツボよ
り下方に位置させるとともに、排気口位置も前記黒鉛ル
ツボより下方に設定したことを特徴とする非鉄金属溶解
保持炉。1. A graphite crucible, a support for supporting the graphite crucible at a lower portion of the graphite crucible, a furnace body surrounding the graphite crucible and the support, a flame attached to the furnace body and injecting a flame into the furnace body A non-ferrous metal melting and holding furnace comprising: a mounting position and a flame injection direction of the burner are set below the graphite crucible; and a flame is formed by the graphite crucible.
Ri Rutotomoni is located below, non-ferrous metal melting holding furnace, characterized in that also the exhaust port position was set lower than the graphite crucible.
持する炉体と、 該炉体に取り付けられ炉体内に火炎を噴射するバーナ
と、 を備えた非鉄金属溶湯保持炉において、 前記バーナの取り付け位置および火炎噴射方向を、前記
鉄ルツボより下方に設定し、火炎を前記鉄ルツボより下
方に位置させるとともに、排気口位置も前記鉄ルツボよ
り下方に設定したことを特徴とする非鉄金属溶湯保持
炉。2. A graphite crucible, an iron crucible surrounding and suspending the graphite crucible, a furnace body surrounding the iron crucible and supporting the iron crucible at an upper portion of the iron crucible, and a furnace attached to the furnace body. A burner that injects a flame into the body, and a non-ferrous metal melt holding furnace comprising: a mounting position and a flame injection direction of the burner are set below the iron crucible; and the flame is placed below the iron crucible.
Non-ferrous metal melt holding furnace, characterized in that the position is not Rutotomoni also outlet position set lower than the iron crucible towards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24935594A JP3337569B2 (en) | 1994-10-14 | 1994-10-14 | Nonferrous metal melting and holding furnace and nonferrous metal melting and holding furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24935594A JP3337569B2 (en) | 1994-10-14 | 1994-10-14 | Nonferrous metal melting and holding furnace and nonferrous metal melting and holding furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08114388A JPH08114388A (en) | 1996-05-07 |
| JP3337569B2 true JP3337569B2 (en) | 2002-10-21 |
Family
ID=17191801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24935594A Expired - Fee Related JP3337569B2 (en) | 1994-10-14 | 1994-10-14 | Nonferrous metal melting and holding furnace and nonferrous metal melting and holding furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3337569B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1038261A (en) * | 1996-07-18 | 1998-02-13 | Toyota Motor Corp | Combustion device |
-
1994
- 1994-10-14 JP JP24935594A patent/JP3337569B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08114388A (en) | 1996-05-07 |
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