JPS6391988A - Electric furnace - Google Patents
Electric furnaceInfo
- Publication number
- JPS6391988A JPS6391988A JP23675786A JP23675786A JPS6391988A JP S6391988 A JPS6391988 A JP S6391988A JP 23675786 A JP23675786 A JP 23675786A JP 23675786 A JP23675786 A JP 23675786A JP S6391988 A JPS6391988 A JP S6391988A
- Authority
- JP
- Japan
- Prior art keywords
- heating element
- electric furnace
- furnace
- lanthanum chromite
- 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.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 claims description 36
- 239000000919 ceramic Substances 0.000 claims description 17
- NFYLSJDPENHSBT-UHFFFAOYSA-N chromium(3+);lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+3].[La+3] NFYLSJDPENHSBT-UHFFFAOYSA-N 0.000 claims description 14
- 239000011094 fiberboard Substances 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 230000001404 mediated effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は電気炉、詳しくは熱源としてランタンクロマイ
ト系発熱体を備える形式の電気炉に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric furnace, and more particularly to an electric furnace equipped with a lanthanum chromite heating element as a heat source.
従来技術とその問題点
従来より、電気炉などの発熱体として用いられているラ
ンタンクロマイト系発熱体は、酸化雰囲気中では、高温
において発熱体から組成中のクローム成分が蒸発し、炉
材や被加熱物への拡散反応が有り、ピンク色に着色が生
ずる難点があった。Conventional technology and its problems Lanthanum chromite-based heating elements, which have traditionally been used as heating elements in electric furnaces, etc., evaporate in an oxidizing atmosphere at high temperatures, causing damage to the furnace materials and coverings. There was a diffusion reaction to the heated object, which caused the problem of pink coloring.
また内張耐火物においても、アルカリ含有の耐火物など
と反応し、ランタンクロマイト系発熱体の破損原因にな
ったため、専用耐火物を使用しなければならない不利が
あった。ここでいう、アルカリ含有の耐火物とは、シャ
モツト質、シリカ質、マグネシア質などのことで、高温
度域で使用できる耐火物のことをいう。In addition, the lining refractory reacts with alkali-containing refractories and causes damage to the lanthanum chromite heating element, so there is a disadvantage that a special refractory must be used. The alkali-containing refractory mentioned here refers to a refractory that can be used in a high temperature range, such as chamots, silica, and magnesia.
従って従来よりこれらの欠点を除くために、上記発熱体
よりのクロームの蒸発に対しては、第３図に示すように
専用耐火物からなる炉体（ａ）の中央に緻密高純度のア
ルミナチューブ（ｂ）を貫通し、炉蓋（ｃ）を取付けて
使用していた。Therefore, in order to eliminate these drawbacks, as shown in Figure 3, a dense high-purity alumina tube is installed in the center of the furnace body (a) made of a special refractory to prevent the evaporation of chromium from the heating element. It was used by penetrating through (b) and attaching the furnace lid (c).
従来では、このような構造のため被加熱物（ｄ）に対し
ては、上記発熱体（１）のクローム発熱反応より保護す
ることができたが、炉体（ａ）を構成する耐火物に対し
ては、無視する構造になっていた。また上記耐火物と上
記発熱体（ａ）とは上。Conventionally, due to this structure, the object to be heated (d) could be protected from the chromium exothermic reaction of the heating element (1), but the refractory material constituting the furnace body (a) However, the structure was such that it was ignored. Moreover, the above-mentioned refractory and the above-mentioned heating element (a) are above.
下に接触面（ｅ）が有るため、アルカリ含有の耐火物の
使用ができなかったので、専用耐火物の使用が余儀なく
されていた。専用耐火物としては通常高純度アルミナ材
が使用され、これは比重が重く、成形密度も高いため蓄
熱口も多くなり、昇温中や高温での保持状態においても
熱損失が多いため発熱体（ａ）にかかる電気全が多く、
表面負荷密度が高くなり発熱体の寿命を著るしく縮める
原因になっていた。ここでいう専用耐火物とは、アルミ
ナ（Ａ９２Ｃｈ９９％、かさ比重３．０ｇ／ｃｍ３、熱
伝導率２． ２ （Ｋ ｃ ａ １／ｍｈ’Ｃａｔ１２
００℃）のものをいう。また表面負荷密度とは、
発熱体に加えられる電力（Ｗ）
＝□である。Since there is a contact surface (e) below, it was not possible to use an alkali-containing refractory, so a special refractory had to be used. High-purity alumina material is usually used as a special refractory, and because it has a heavy specific gravity and high molding density, it has many heat storage holes, and there is a lot of heat loss during heating and holding conditions at high temperatures, so the heating element ( The total electricity required for a) is large,
This increases the surface load density, which significantly shortens the life of the heating element. The special refractory mentioned here is alumina (A92Ch99%, bulk specific gravity 3.0g/cm3, thermal conductivity 2.2 (K c a 1/mh'Cat12
00℃). Furthermore, the surface load density is: power (W) applied to the heating element = □.
有効発熱部表面積（ａｔ！ ）
本発明はこのような従来の問題点を一掃することを目的
としてなされたものである。Effective heating section surface area (at!) The present invention has been made with the aim of eliminating such conventional problems.
問題点を解決するための手段
本発明は、ランタンクロマイト系発熱体を熱源とする電
気炉において、炉体がセラミックファイバーボードから
構築されていると共に、上記発熱体には緻密質高純度セ
ラミックチューブがリード口を除いて被せられているこ
とを特徴とする電気炉に係る。Means for Solving the Problems The present invention provides an electric furnace using a lanthanum chromite heating element as a heat source, in which the furnace body is constructed from a ceramic fiber board, and the heating element is made of a dense high-purity ceramic tube. This invention relates to an electric furnace characterized in that the lead opening is covered except for the lead opening.
実施例
以下に本発明の一実施例を添付図面にもとづき説明する
と、次の通りである。EXAMPLE An example of the present invention will be described below based on the accompanying drawings.
第１図は本発明電気炉の全体を概略的に示す縦断面図、
第２図は本発明電気炉に備えられたヒータの詳細を示す
一部切欠き正面図であって、電気炉の炉体（１）はセラ
ミックファイバーから構築されている。ボードを構成す
るセラミックスファイバーとしては公知の各種材質のも
のを用いることができ、例えばアルミナファイバー、ジ
ルコニアファイバーが適当である。上記炉体（１）にラ
ンタンクロマイトを主成分とする発熱体（２）が貫通保
持されている。このようなランタンクロマイト系発熱体
（２）は常法通り管状の形態で使用され、両端部にはリ
ード口（２ａ）（２ａ）が形成されている。FIG. 1 is a vertical sectional view schematically showing the entire electric furnace of the present invention;
FIG. 2 is a partially cutaway front view showing details of the heater provided in the electric furnace of the present invention, and the furnace body (1) of the electric furnace is constructed from ceramic fiber. Various known materials can be used as the ceramic fibers constituting the board; for example, alumina fibers and zirconia fibers are suitable. A heating element (2) whose main component is lanthanum chromite is held through the furnace body (1). Such a lanthanum chromite heating element (2) is used in a tubular form as usual, and lead ports (2a) (2a) are formed at both ends.
上記発熱体（２）には、両端のリード口（２ａ）（２ａ
）間の全長に渡って、緻密質高純度セラミックチューブ
（３）が、被せられている。上記チューブ（３）を構成
するセラミックとしては、高温雰囲気中での使用に絶え
得るような各種材質のものを用いることができ、特にセ
ラミックのうちでもアルミナ、ジルコニア及びムライト
のような酸化物は、熱安定性がよく好適である。The heating element (2) has lead ports (2a) (2a) at both ends.
) is covered with a dense high-purity ceramic tube (3). As the ceramic constituting the tube (3), various materials that can be used in high-temperature atmospheres can be used. Among ceramics, oxides such as alumina, zirconia, and mullite are particularly suitable. It is suitable because of its good thermal stability.
上記発熱体（２）と、これに被せられたセラミックチュ
ーブ（３）との間には周隙（４）が形成され、この周隙
（４）の端部は栓体（５）により閉じられている。この
栓体（５）はスペーサを兼用し、発熱体（２）とチュー
ブ（３）を同心配置のもとに結合一体化する。上記栓体
（５）の材質としては、セラミックチューブ（３）と同
材質のものが好適である。A gap (4) is formed between the heating element (2) and the ceramic tube (3) placed over it, and the end of this gap (4) is closed by a stopper (5). ing. This plug (5) also serves as a spacer, and connects and integrates the heating element (2) and tube (3) in a concentric arrangement. The material of the plug (5) is preferably the same as that of the ceramic tube (3).
上記発熱体（１）の導電性は酸素を介在するホッピング
伝導によりのその導電機構がなされており、使用雰囲気
中に酸素が存在している必要がある。上記周隙（５）の
形成によって、このような酸素（空気）を確保でき、上
記チューブ（３）による密封被覆に拘わらず、上記発熱
体（２）の発熱に回答支障はない。The electrical conductivity of the heating element (1) is based on hopping conduction mediated by oxygen, and oxygen must be present in the atmosphere in which it is used. By forming the circumferential gap (5), such oxygen (air) can be ensured, and there is no problem with the heat generation of the heating element (2) regardless of the sealing covering by the tube (3).
ランタンクロマイト系発熱体（２）に被せられた緻密質
高純度セラミックチューブ（３）は該発熱体（２）の該
周部を覆うので、当該発熱体（２）から炉体（１）内へ
のクロム成分の飛散がなくなる。従って炉内に第３図の
従来炉にみられるような隔壁を設けなくとも被加熱物（
６）が蒸散クロム成分と反応して着色汚染されるという
ようなことがなくなり、炉の構造の簡素化と有効スペー
スの拡大を計り得る。The dense high-purity ceramic tube (3) placed over the lanthanum chromite heating element (2) covers the circumferential portion of the heating element (2), so that it can be passed from the heating element (2) into the furnace body (1). The scattering of chromium components is eliminated. Therefore, the object to be heated (
6) is prevented from being colored and contaminated by reaction with evaporated chromium components, and the furnace structure can be simplified and the effective space can be expanded.
更に炉体（１）を構成するセラミックファイバーボード
は結合剤を含み、結合剤は、通常Ｐ２０５ 、Ｎａ２０
．に２０などのアルカリ成分を含有するが、炉体（１）
と発熱体（１）はその貫通部（７）に於て緻密質高純度
セラミックチューブ（３）により隔離されるので、発熱
体（２）の破損原因となるようなランタンクロマイトと
アルカリ成分の反応はなくなり、セラミックファイバー
ボードより構築の炉体（１）の熱源として、ランタンク
ロマイト系発熱体（２）を支障なく適用できる。Furthermore, the ceramic fiberboard constituting the furnace body (1) contains a binder, and the binder is usually P205, Na20
．． contains alkaline components such as 20%, but the furnace body (1)
Since the heating element (1) is isolated by the dense high-purity ceramic tube (3) at its penetration part (7), there is no reaction between the lanthanum chromite and the alkaline component that could cause damage to the heating element (2). Therefore, the lanthanum chromite heating element (2) can be used without any problem as a heat source for the furnace body (1) constructed from ceramic fiberboard.
［実験例］ 本発明電気炉の特性調査結果を示すと次の通りである。[Experiment example] The results of investigating the characteristics of the electric furnace of the present invention are as follows.
電気炉形状 ５２０Ｗｘ４４０Ｈｘ４．５ＯＬ有効炉内
寸法 ２００ＷＸ２００ＨＸ２５０Ｌヒ一タ本数 １０
本
調査の結果、炉内温度１８００ °Ｃまでを５時間で昇
温することが観察された。そのときの発熱体（２）の表
面負荷密度は６ ｗ ／ ｃｄであり、発熱体の表面に
は殆んどクラックはみられなかった。比較のため、同寸
法の炉をアルミナレンガ耐火物にて製造し、同条件下で
テストした結果、表面負荷密度が１７ｗ／ｃ♂であり、
また発熱体の表面に大きなりラックが観察された。Electric furnace shape 520Wx440Hx4.5OL Effective furnace internal dimensions 200Wx200Hx250L Number of heaters 10
As a result of this investigation, it was observed that the temperature inside the furnace increased to 1800 °C in 5 hours. The surface load density of the heating element (2) at that time was 6 w/cd, and almost no cracks were observed on the surface of the heating element. For comparison, a furnace with the same dimensions was manufactured using alumina brick refractories and tested under the same conditions. As a result, the surface load density was 17 w/c♂,
Also, a large rack was observed on the surface of the heating element.
効 果
本発明による電気炉によれば炉体（１）がセラミックフ
ァイバーから構築されるので、従来の専用耐火物からな
る電気炉に比べ炉内の熱損失が少なく、蓄熱及び断熱効
果がよく、昇温時や高温での保持状態においても電力量
が少なくなり、ランタンクロマイト系発熱体（２）の表
面負荷密度も従来に比べ約２１５に下り、ランタンクロ
マイト系発熱体（２）の寿命を大巾に向上できる。Effects According to the electric furnace according to the present invention, since the furnace body (1) is constructed from ceramic fiber, there is less heat loss in the furnace than in electric furnaces made of conventional dedicated refractories, and the heat storage and insulation effects are good. The amount of electric power is reduced even when the temperature is raised or held at high temperatures, and the surface load density of the lanthanum chromite heating element (2) is also reduced to approximately 215 compared to the conventional one, greatly extending the life of the lanthanum chromite heating element (2). It can be greatly improved.
第１図は本発明の一実施例に於ける電気炉全体を概略的
に示す縦断面図、第２図は第１図に示されたランタンク
ロマイト系発熱体の詳細を示す一部切欠き正面図、第３
図は従来の電気炉の一例を示す縦断面図である。
図に於て、（１）は炉体、（２）はランタンクロマイト
系発熱体、（３）はセラミックチューブ、（４）は周隙
、（５）は栓体、（６）は被加熱物−（７）は貫通部で
ある。
（以 上）
代理人 弁理士 三 枝 英 二：′″ ゛第１図
第２図
筑 ３ 図
手続補ｉＩＥ書帽幻
昭和６２年７月２日
１ 事件の表示
昭和６１年特許願第２３６７５７号
２ 発明の名称
電気炉
３ 補正をする者
事件との関係 特許出願人
日本化学陶業株式会社
（ほか１名）
４代理人
大阪市東区平野町２の１０ 沢の鶴ビル自 発
６ 補正の対象
明細書中「発明の詳細な説明」の項及び図面
補正の内容
１ 明細書の記載を次の正誤表の通り訂正する。
正誤表
［−
」
し
１・
面第１図及び第３図を別紙の通り訂正する。
（以 上）
第１図
第３図FIG. 1 is a longitudinal sectional view schematically showing the entire electric furnace in one embodiment of the present invention, and FIG. 2 is a partially cutaway front view showing details of the lanthanum chromite heating element shown in FIG. 1. Figure, 3rd
The figure is a longitudinal sectional view showing an example of a conventional electric furnace. In the figure, (1) is the furnace body, (2) is the lanthanum chromite heating element, (3) is the ceramic tube, (4) is the gap, (5) is the plug body, and (6) is the object to be heated. -(7) is a penetration part. (Above) Agent: Eiji Saegusa, Patent Attorney:''' ゛Figure 1 Figure 2 Chikku 3 Figure Procedure Supplement iIE Booklet Illustrated July 2, 1985 1 Display of Case Patent Application No. 236757 of 1985 2 Name of the invention Electric furnace 3 Relationship to the case of the person making the amendment Patent applicant Nihon Kagaku Togyo Co., Ltd. (and one other person) 4 Agent Sawanotsuru Building, 2-10 Hirano-cho, Higashi-ku, Osaka City 6 Details subject to amendment Contents of amendments to the "Detailed Description of the Invention" section and drawings in the document 1 The statements in the description are corrected as shown in the following errata. Errata [-'' 1. Figures 1 and 3 on page 1 are corrected as shown in the attached sheet. (That's all) Figure 1 Figure 3
Claims (1)
において、炉体がセラミックファイバーボードから構築
されていると共に、上記発熱体には緻密質高純度セラミ
ックチューブがリード口を除いて被せられていることを
特徴とする電気炉。(1) In an electric furnace that uses a lanthanum chromite heating element as a heat source, the furnace body is constructed from a ceramic fiber board, and the heating element is covered with a dense high-purity ceramic tube except for the lead ports. An electric furnace characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23675786A JPS6391988A (en) | 1986-10-03 | 1986-10-03 | Electric furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23675786A JPS6391988A (en) | 1986-10-03 | 1986-10-03 | Electric furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6391988A true JPS6391988A (en) | 1988-04-22 |
Family
ID=17005339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23675786A Pending JPS6391988A (en) | 1986-10-03 | 1986-10-03 | Electric furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6391988A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02210784A (en) * | 1989-02-10 | 1990-08-22 | Mitsubishi Heavy Ind Ltd | Ceramics heater furnace |
| JPH02213078A (en) * | 1989-02-14 | 1990-08-24 | Mitsubishi Heavy Ind Ltd | Ceramic heater furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS567995A (en) * | 1979-06-28 | 1981-01-27 | Inoue Japax Res Inc | Manufacture of heat exchanger |
-
1986
- 1986-10-03 JP JP23675786A patent/JPS6391988A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS567995A (en) * | 1979-06-28 | 1981-01-27 | Inoue Japax Res Inc | Manufacture of heat exchanger |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02210784A (en) * | 1989-02-10 | 1990-08-22 | Mitsubishi Heavy Ind Ltd | Ceramics heater furnace |
| JPH02213078A (en) * | 1989-02-14 | 1990-08-24 | Mitsubishi Heavy Ind Ltd | Ceramic heater furnace |
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