JP2000247659A - Auxiliary heater for float bath - Google Patents

Auxiliary heater for float bath

Info

Publication number
JP2000247659A
JP2000247659A JP11099186A JP9918699A JP2000247659A JP 2000247659 A JP2000247659 A JP 2000247659A JP 11099186 A JP11099186 A JP 11099186A JP 9918699 A JP9918699 A JP 9918699A JP 2000247659 A JP2000247659 A JP 2000247659A
Authority
JP
Japan
Prior art keywords
heating element
furnace
heater
float bath
sic
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
Application number
JP11099186A
Other languages
Japanese (ja)
Inventor
Kazuhisa Sakamoto
和久 坂本
Mitsuaki Osada
光昭 他田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokai Konetsu Kogyo Co Ltd
Original Assignee
Tokai Konetsu Kogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tokai Konetsu Kogyo Co Ltd filed Critical Tokai Konetsu Kogyo Co Ltd
Priority to JP11099186A priority Critical patent/JP2000247659A/en
Publication of JP2000247659A publication Critical patent/JP2000247659A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B18/00Shaping glass in contact with the surface of a liquid
    • C03B18/02Forming sheets
    • C03B18/18Controlling or regulating the temperature of the float bath; Composition or purification of the float bath

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Resistance Heating (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a heater which is used as an auxiliary heater of a silicon carbide heating element used mainly in a float bath furnace for melting glass and is capable of prolonging the life of the float bath furnace. SOLUTION: The heating device of the float bath furnace comprises the reaction sintered silicon carbide heating element 1, a protective tube 2 which is manufactured of an SiC-Si composite consisting of 70 to 90 wt.% SiC and 30 to 10 wt.% Si and having a porosity of <=1% and is closed at one side end and a heating element support 4. The supporting and wiring of the device comprising these members only on one side of the furnace are possible. Independent temperature control is executed by building a thermocouple 3 of the heater into the protective tube.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、硝子を溶解するフ
ロートバス炉における、炉の補助加熱ヒータに関する。
The present invention relates to an auxiliary heater for a furnace in a float bath furnace for melting glass.

【0002】[0002]

【従来の技術】硝子を溶解するフロートバス炉は、一般
に1100℃前後の温度で使用され、その発熱体として
主に炭化珪素発熱体が使用されている。しかし炭化珪素
発熱体は、使用することにより抵抗増加を徐々に起こ
し、炉に必要な電力の不足を引き起こす。そのため定期
的に発熱体を交換することが必要であった。
2. Description of the Related Art A float bath furnace for melting glass is generally used at a temperature of about 1100 ° C., and a silicon carbide heating element is mainly used as a heating element. However, the use of the silicon carbide heating element causes a gradual increase in resistance when used, and causes a shortage of electric power required for the furnace. Therefore, it was necessary to periodically replace the heating element.

【0003】[0003]

【発明が解決しようとする課題】フロートバス炉は、1
0年程度で発熱体を交換しているが、発熱体の交換は炉
の天井を解体する必要があり、フロートバス炉は大型設
備であるため、交換費用が大がかりとなる。また交換時
間も大幅にかかりその間の生産が止まるため、少しでも
炉の稼動時間を長くすることが求められていた。
The float bath furnace has the following features.
Although the heating element is replaced in about 0 years, the replacement of the heating element requires dismantling the ceiling of the furnace, and since the float bath furnace is a large facility, the replacement cost becomes large. In addition, the replacement time is greatly increased, and production during that time is stopped. Therefore, it has been required to extend the operation time of the furnace even a little.

【0004】[0004]

【課題を解決するための手段】炉の稼動中に発熱体を出
し入れできるような構造として、炉の片側から挿入でき
るように片端子型発熱体を用い、発熱体を炉内のアルカ
リ雰囲気から守るためのSiC−Si複合材で作製した
保護管、および発熱体支持具を持つ補助加熱ヒータを設
け、それまで使用してきた発熱体だけでは不足してきた
電力の補助加熱として使用し、フロートバス炉の稼動時
間を延命させることである。また補助加熱するためのヒ
ータを独立して温度制御するため、SiC−Si複合材
で作製した保護管内に熱電対を挿入することが望まし
い。特許出願公開平3−46785では、SiCヒータ
にSiC保護管を被せる方法が提案されているが、この
方式は保護管が開端管で、両側に端子をもつSiCヒー
タである。フロートバス炉では、側面からの片持ちが要
求されているため、本発明とは構造・目的が異なる。ま
た保護管についても単なるSiC質の保護管ではフロー
トバス炉からでるアルカリ雰囲気からヒータを守ること
が十分ではない。更に本発明がSiC70〜90wt%
とSi30〜10wt%からなる気孔率1%以下のSi
C−Si複合材としたのは、SiCが90%以上では緻
密すぎてSiが含浸しにくくなって気孔率が大きくな
り、またSiCが70%以下では高温での強度不足、ク
リープ特性劣化となり、これらの範囲を超えるとフロー
トバス炉で要求されている条件が満足できないためであ
る。
Means for Solving the Problems A structure in which a heating element can be taken in and out during operation of the furnace is provided with a one-terminal type heating element so that it can be inserted from one side of the furnace, and the heating element is protected from the alkali atmosphere in the furnace. A protective tube made of a SiC-Si composite material and an auxiliary heater having a heating element support are provided, and the heating element used so far is used as auxiliary heating of electric power, which is insufficient. It is to extend the operating time. In order to independently control the temperature of the heater for auxiliary heating, it is desirable to insert a thermocouple into a protective tube made of a SiC-Si composite material. Japanese Patent Application Laid-Open No. 3-46785 proposes a method of covering a SiC heater with a SiC protection tube. In this method, the protection tube is an open end tube and has a terminal on both sides. Since the float bath furnace is required to be cantilevered from the side, its structure and purpose are different from those of the present invention. As for the protection tube, it is not sufficient to protect the heater from an alkaline atmosphere coming out of a float bath furnace with a simple protection tube made of SiC. Furthermore, the present invention provides a SiC 70 to 90 wt
And Si having a porosity of 1% or less composed of Si and 30 to 10% by weight
When the C-Si composite material is used, if the SiC content is 90% or more, it is too dense to impregnate Si and the porosity increases, and if the SiC content is 70% or less, the strength becomes insufficient at high temperatures and the creep characteristics deteriorate. If the amount exceeds these ranges, the conditions required for the float bath furnace cannot be satisfied.

【0005】[0005]

【発明の実施の形態】炭化珪素質保護管の内側に、スパ
イラルを切ることにより片端子構造が実現できる炭化珪
素発熱体を発熱体として用い、また発熱体を支持する支
持具、更に炭化珪素質保護管の内部に熱電対を挿入した
構造からなる。熱電対を挿入する場合は、主加熱装置側
とは独立した温度制御を行うことが目的であり、熱電対
が無い場合でも電力制御を行えば何ら問題はない。
BEST MODE FOR CARRYING OUT THE INVENTION Inside a silicon carbide protective tube, a silicon carbide heating element capable of realizing a one-terminal structure by cutting a spiral is used as a heating element, a support for supporting the heating element, and further a silicon carbide heating element. It has a structure in which a thermocouple is inserted inside the protection tube. When a thermocouple is inserted, the purpose is to perform temperature control independent of the main heating device side, and there is no problem if power control is performed even when there is no thermocouple.

【0006】[0006]

【実施例】本発明を実施例に基づいて説明する。図1
は、炭化珪素質発熱体、炭化珪素質保護管、発熱体支持
具、熱電対から構成された加熱ヒータを示している。保
護管はφ110×L1600で、再結晶質SiCにSi
を20%溶融含浸させたSiC−Si複合材料を使用し
ている。また発熱体は、φ55×1100(発熱部)×
700(非発熱部)のスパイラル形状片端子型発熱体
で、材料的には反応焼結させたSiCを素材として作製
している。発熱体支持具には、多孔質のAl−S
iO系の煉瓦を使用した。熱電対には、R熱電対にム
ライト質(3Al,2SiO)の保護管を発熱
体の内面に固定した。上記構成により、炉内のアルカリ
雰囲気から発熱体を保護し、熱電対を内蔵することによ
り、独立した温度制御が可能となった。また炉の片側か
ら挿入できるため、炉を停止することなく、該装置を出
し入れすることができ、生産を止めることなく交換でき
た。本発明を実際の炉にセットした状態を図2で示し、
出力18kw(保護管内温度1310℃)を印加した際
の温度データを表1にまとめた。また保護管の材質の評
価テストとして、炉内温度1100℃、窒素雰囲気、ア
ルカリ添加、500時間保持の条件にてテストを行った
結果を表2にまとめた。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on embodiments. FIG.
Indicates a heater composed of a silicon carbide heating element, a silicon carbide protection tube, a heating element support, and a thermocouple. The protection tube is φ110 × L1600 and recrystallized SiC
Is used in a 20% melt-impregnated SiC-Si composite material. The heating element is φ55 × 1100 (heating section) ×
A spiral single-terminal heating element of 700 (non-heat generating part) is made of SiC which has been sintered by reaction. The heating element support includes porous Al 2 O 3 —S
Using the iO 2 system of brick. As the thermocouple, a mullite (3Al 2 O 3 , 2SiO 2 ) protection tube was fixed to the inner surface of the heating element in addition to the R thermocouple. With the above configuration, the heating element is protected from the alkali atmosphere in the furnace, and independent temperature control is possible by incorporating a thermocouple. Further, since the device can be inserted from one side of the furnace, the device can be taken in and out without stopping the furnace, and can be replaced without stopping production. FIG. 2 shows a state where the present invention is set in an actual furnace,
Table 1 summarizes the temperature data when an output of 18 kw (temperature in the protective tube 1310 ° C.) was applied. In addition, Table 2 summarizes the results of tests performed under the conditions of a furnace temperature of 1100 ° C., a nitrogen atmosphere, alkali addition, and holding for 500 hours as an evaluation test of the material of the protective tube.

【0007】[0007]

【発明の効果】これらのように本発明の補助加熱ヒータ
を使用することにより、主たる発熱体だけでは不足して
きた電力を補うため、必要な電力の分だけの数量を挿入
すれば、炉を停止することなく、電力を補うことがで
き、フロートバス炉の寿命を延長させることができる。
また本発明は、新規の炉だけではなく既設の炉に対して
も、側面の取付け孔を開けることにより使用することが
できる。更に補助ヒータがその使用により劣化して電力
不足となった場合には、炉を操炉したまま交換すること
ができるため、フロートバス炉の寿命延長の要求を完全
に満足させるものである。
As described above, by using the auxiliary heater of the present invention, in order to compensate for the power shortage caused by the main heating element alone, the furnace is shut down by inserting the necessary amount of power. Power can be supplemented, and the life of the float bath furnace can be extended.
Further, the present invention can be used not only for a new furnace but also for an existing furnace by forming a mounting hole on a side surface. Further, when the auxiliary heater is deteriorated due to its use and the power becomes insufficient, the furnace can be replaced while the furnace is being operated, thereby completely satisfying the demand for extending the life of the float bath furnace.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明で実施した装置を組み立てた加熱ヒータ
を示す図。
FIG. 1 is a diagram showing a heater assembled with an apparatus according to the present invention.

【図2】本発明で実施した装置を炉にセットした状態お
よび各表面温度の測定位置を示す図。
FIG. 2 is a view showing a state in which the apparatus according to the present invention is set in a furnace and measurement positions of respective surface temperatures.

【符号の説明】[Explanation of symbols]

1.発熱体 2.保護管 3.熱電対 4.発熱体支持具 5.端子 1. Heating element 2. Protection tube 3. Thermocouple 4. Heating element support 5. Terminal

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 フロートバス炉における加熱ヒータにお
いて、炭化珪素発熱体、SiC70〜90wt%とSi
30〜10wt%からなる気孔率1%以下のSiC−S
i複合材で作製された片側閉端である保護管、および発
熱体支持具から構成され、かつこれらから構成された装
置が、炉の片側のみで支持、配線が可能であることを特
徴とする加熱ヒータ。
1. A heater in a float bath furnace, wherein a silicon carbide heating element, 70 to 90 wt% of SiC and Si
SiC-S composed of 30 to 10 wt% and having a porosity of 1% or less
It is characterized by comprising a protective tube having a closed end on one side made of i-composite material, and a heating element support, and a device composed of these can be supported and wired only on one side of the furnace. Heater.
【請求項2】 前記加熱ヒータにおいて、熱電対を保護
管内に内蔵することにより独立した温度制御ができるこ
とを特徴とする請求項1記載の加熱ヒータ。
2. The heater according to claim 1, wherein the heater can be independently controlled in temperature by incorporating a thermocouple in a protection tube.
JP11099186A 1999-03-03 1999-03-03 Auxiliary heater for float bath Pending JP2000247659A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11099186A JP2000247659A (en) 1999-03-03 1999-03-03 Auxiliary heater for float bath

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11099186A JP2000247659A (en) 1999-03-03 1999-03-03 Auxiliary heater for float bath

Publications (1)

Publication Number Publication Date
JP2000247659A true JP2000247659A (en) 2000-09-12

Family

ID=14240628

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11099186A Pending JP2000247659A (en) 1999-03-03 1999-03-03 Auxiliary heater for float bath

Country Status (1)

Country Link
JP (1) JP2000247659A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002162296A (en) * 2000-11-27 2002-06-07 Nippon Dennetsu Co Ltd Heater with temperature detection sensor
CN110062483A (en) * 2019-05-14 2019-07-26 四川旭虹光电科技有限公司 Electric heater unit and its application on a kind of floatation glass production line

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002162296A (en) * 2000-11-27 2002-06-07 Nippon Dennetsu Co Ltd Heater with temperature detection sensor
CN110062483A (en) * 2019-05-14 2019-07-26 四川旭虹光电科技有限公司 Electric heater unit and its application on a kind of floatation glass production line
CN110062483B (en) * 2019-05-14 2022-03-15 四川虹科创新科技有限公司 Electric heating device on float glass production line and application thereof

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