JPH0574014B2 - - Google Patents
Info
- Publication number
- JPH0574014B2 JPH0574014B2 JP12822688A JP12822688A JPH0574014B2 JP H0574014 B2 JPH0574014 B2 JP H0574014B2 JP 12822688 A JP12822688 A JP 12822688A JP 12822688 A JP12822688 A JP 12822688A JP H0574014 B2 JPH0574014 B2 JP H0574014B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- protection tube
- tube
- thermometer
- thermocouple
- 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 - Lifetime
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- Measuring Temperature Or Quantity Of Heat (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、溶融金属等の温度を連続的に測定す
る保護管式連続測温計に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a protection tube type continuous thermometer that continuously measures the temperature of molten metal, etc.
（従来の技術）
従来、溶銑、溶鋼などの高温の溶融金属の温度
を測定する方法として、放射温度計、光高温計、
熱電温度計等が提供されているが、測温精度の点
で熱電温度計が好ましく、最も一般的に使用され
るのは、白金−ロジウム熱電対（以下PR熱電対
と称す）の先端を石英管で保護する消耗型温度計
であり、通常、溶銑、溶鋼などにその熱電対を浸
漬すると、極めて短時間（10〜20秒間）のうちに
感熱部が溶融し、使用不能になるので、短時間で
測温を終了しなければならず、かつ測定１回ごと
に温度計交換を必要としていた。このため、品
質、操業の管理が困難で、測温コストが高いこと
から、長時間連続測温できる温度計が強く望ま
れ、かかる浸漬型温度計の保護管として、例え
ば、実開昭55−38290号に示されているように、
高温の被測温雰囲気中に挿入される外側部分を、
ボロンナイトライドを主成分とするものがあり、
また他に、金属モリブデン、ジルコニアセラミツ
クス複合体を材質とした保護管が提供されてい
る。(Prior Art) Conventionally, methods for measuring the temperature of high-temperature molten metals such as hot metal and molten steel include radiation thermometers, optical pyrometers,
Thermocouple thermocouples are available, but thermocouple thermocouples are preferred in terms of temperature measurement accuracy, and the most commonly used one is a platinum-rhodium thermocouple (hereinafter referred to as a PR thermocouple) with a quartz tip. It is a consumable thermometer that is protected by a tube. Normally, if the thermocouple is immersed in hot metal or molten steel, the heat-sensitive part will melt in a very short time (10 to 20 seconds) and become unusable. Temperature measurements had to be completed within hours, and the thermometer had to be replaced after each measurement. For this reason, it is difficult to control quality and operation, and temperature measurement costs are high. Therefore, a thermometer that can continuously measure temperature for a long time is strongly desired. As shown in No. 38290,
The outer part that is inserted into the high temperature atmosphere to be measured is
There are some whose main ingredient is boron nitride.
In addition, protective tubes made of metal molybdenum and zirconia ceramic composites have been provided.
しかし、これらの保護管を用いた温度計の場
合、溶銑、溶鋼の連続測温では、５〜10時間にて
保護管が浸食するため寿命が不十分である。しか
し、最近、このような保護管として好ましい材
質、すなわち溶銑、溶鋼等の溶融金属に対する耐
食性に最も優れ、かつ十分な強度、耐熱性、熱伝
導性を有するものとして、硼化物系セラミツクが
提供されている。このような硼化物系セラミツク
の材料としては、ZrB2，TiB2，TaB2などがあ
る。 However, in the case of thermometers using these protection tubes, the lifespan is insufficient for continuous temperature measurement of hot metal or molten steel because the protection tube erodes in 5 to 10 hours. However, recently, boride-based ceramics have been proposed as a preferred material for such protective tubes, which has the best corrosion resistance against molten metals such as hot metal and molten steel, as well as sufficient strength, heat resistance, and thermal conductivity. ing. Materials for such boride ceramics include ZrB 2 , TiB 2 , TaB 2 and the like.
特にZrB2は前記の材質条件を最も具備してい
る。 In particular, ZrB 2 best satisfies the above material conditions.
（発明が解決しようとする課題）
しかるに、この硼化物系セラミツクは、非酸化
物を主成分とするため、これを保護管材質に用い
た場合、高温で保護管内部が還元雰囲気下とな
る。一方、測温センサーとして用いるPR熱電対
は還元雰囲気下で劣化されやすく、溶銑、溶鋼等
の溶融金属の温度を連続的に測定した場合、この
熱電対の劣化により、起電力の急激な変化や断線
が発生し、保護管の浸食による寿命に比して極め
て短時間のうちに測温が不能となる問題があり、
長時間にわたつて測温可能な連続測温計が強く望
まれていた。(Problems to be Solved by the Invention) However, since this boride-based ceramic mainly contains non-oxides, when it is used as a material for the protection tube, the inside of the protection tube becomes under a reducing atmosphere at high temperatures. On the other hand, PR thermocouples used as temperature sensors are easily deteriorated in reducing atmospheres, and when continuously measuring the temperature of molten metals such as hot metal or molten steel, the deterioration of these thermocouples can cause rapid changes in electromotive force. There is a problem in which wire breakage occurs and temperature measurement becomes impossible in an extremely short period of time compared to the lifespan due to corrosion of the protection tube.
There was a strong desire for a continuous thermometer that could measure temperature over a long period of time.
（課題を解決するための手段、作用）
本発明は、前記課題を解決し、長時間の連続測
温を可能とするものである。(Means and effects for solving the problems) The present invention solves the above problems and enables continuous temperature measurement over a long period of time.
本発明の要旨は、硼化物系セラミツクを主成分
とする保護管の内部にアルミナを主成分とする保
護管を配し最内部にアルミナを主成分とする絶縁
管を配し、該絶縁管の先端感熱部近傍を、貴金属
にて被覆した測温センサーを配したことを特徴と
する保護管式連続測温計にある。 The gist of the present invention is to arrange a protective tube mainly composed of alumina inside a protective tube mainly composed of boride ceramic, and arrange an insulating tube mainly composed of alumina inside the protective tube. This is a protection tube type continuous thermometer characterized by having a temperature sensor coated with a precious metal near the tip of the heat-sensing part.
保護管の材質としては、前記のように硼化物セ
ラミツク特にZrB2が好ましいが、非酸化物を主
成分とするため、高温で保護管内部が還元雰囲気
となりやすい。 As the material for the protection tube, boride ceramics, particularly ZrB 2 , are preferred as described above, but since the main component is non-oxide, the inside of the protection tube tends to become a reducing atmosphere at high temperatures.
一方、測温センサーとしては、精度の点で、一
般に熱電対がひろく用いられ、代表的なものとし
ては、前記PR熱電対等貴金属の熱電対が好まし
いが、これらのセンサーの劣化による測温精度悪
化や断線を防止するため、内部保護管、絶縁管、
及び貴金属の被覆にて測温センサーが該還元雰囲
気に接することを防止することにより、測温セン
サーの寿命を向上し、かつ硼化物系セラミツクの
優れた耐食性により、長時間の連続測温を可能と
する。 On the other hand, thermocouples are generally widely used as temperature sensors due to their accuracy, and thermocouples made of precious metals such as the above-mentioned PR thermocouple are typically preferred, but temperature measurement accuracy deteriorates due to deterioration of these sensors. In order to prevent wire breakage, internal protection tubes, insulating tubes,
By preventing the temperature sensor from coming into contact with the reducing atmosphere with a precious metal coating, the life of the temperature sensor is extended, and the excellent corrosion resistance of boride ceramic allows continuous temperature measurement for long periods of time. shall be.
アルミナを主成分とする内部保護管や絶縁管の
形状及び成分は、特に規定するところではない
が、Al2O3が90重量パーセント以上のものが望ま
しい。 The shape and composition of the internal protective tube and insulating tube, which are mainly composed of alumina, are not particularly limited, but preferably contain 90% by weight or more of Al 2 O 3 .
内部保護管は、測温センサー先端感熱部と硼化
物セラミツクを主成分とする保護管内部が直接接
触するのを防止し、かつ気密性により、還元雰囲
気から測温センサー全体を保護する作用を奏す
る。しかし、長時間の測温においては、内部保護
管のみでは測温センサーに対する保護効果が不十
分である。よつて、絶縁管及び貴金属被覆と共に
測温センサーを保護するものである。 The internal protection tube prevents direct contact between the heat-sensitive part at the tip of the temperature sensor and the inside of the protection tube, which is mainly made of boride ceramic, and has an airtight property that protects the entire temperature measurement sensor from the reducing atmosphere. . However, in long-term temperature measurements, the internal protection tube alone is insufficient to protect the temperature sensor. Therefore, it protects the temperature sensor together with the insulating tube and the noble metal coating.
絶縁管は、測温センサーの感熱部以外の素線部
分の接触を防止し、かつ内部保護管と共に素線部
分を還元雰囲気から保護する。 The insulating tube prevents the wire portions other than the heat-sensitive portion of the temperature sensor from coming into contact with each other, and together with the internal protection tube, protects the wire portions from the reducing atmosphere.
測温センサーの感熱部近傍を被覆する貴金属
は、該感熱部の測温精度、応答性を保ちつつ、内
部保護管と共に感熱部を還元雰囲気から保護す
る。なお該貴金属の成分、純度も特に規定するも
のではないが、好ましい材質として、白金、ロジ
ウム、イリジウム等があげられる。 The noble metal covering the vicinity of the heat sensitive part of the temperature sensor protects the heat sensitive part from the reducing atmosphere together with the internal protection tube while maintaining the temperature measurement accuracy and responsiveness of the heat sensitive part. Although the components and purity of the noble metal are not particularly limited, preferred materials include platinum, rhodium, iridium, and the like.
（実施例）
本発明を図面に示された実施例によって詳細に
説明する。(Example) The present invention will be explained in detail with reference to an example shown in the drawings.
（実施例 １）
第１図に示すように、温度計は、硼化物セラミツ
クZrB2を主成分とする保護管１の内部にアルミ
ナを主成分とする内部保護管２を配設し、最内部
にアルミナを主成分とする絶縁管３にて被覆し、
温接点に白金被覆４を装着したPR熱電対５を配
し、該熱電対の端子は、補償導線６を用いて、温
度記録計７に接続されている。(Example 1) As shown in Fig. 1, the thermometer has an inner protection tube 2 made of alumina as its main component arranged inside a protection tube 1 made of boride ceramic ZrB 2 as its main component. covered with an insulating tube 3 whose main component is alumina,
A PR thermocouple 5 with a platinum coating 4 attached to the hot junction is arranged, and the terminal of the thermocouple is connected to a temperature recorder 7 using a compensating conductor 6.
なお、硼化物セラミツクを主成分とする外部保
護管１、アルミナを主成分とする内部保護管２、
および絶縁管３の形状はいずれでもよく、また熱
電対の長さ、直径、温接点被覆の形状もいずれで
もよい。 In addition, an outer protection tube 1 whose main component is boride ceramic, an inner protection tube 2 whose main component is alumina,
The shape of the insulating tube 3 may be any, and the length, diameter, and shape of the hot junction coating of the thermocouple may also be any.
このような構成の連続測温計を用い、連続鋳造
設備のタンデイツシユ内にて、1520〜1580℃の溶
鋼温度を測定した。その結果、熱電対の劣化によ
る中断もなく約70時間にわたり精度よく正常に測
温が行われた。 Using a continuous thermometer with such a configuration, the temperature of molten steel from 1520 to 1580°C was measured in the tundish of a continuous casting facility. As a result, temperature measurements were carried out normally and accurately for approximately 70 hours without any interruptions due to deterioration of the thermocouple.
（比較例 １）
外側部分をボロンナイトライドを主成分とする
保護管１を用いた測温計にて同一溶鋼を測温した
場合、約10時間の測温後保護管の溶損により、測
温不能となつた。(Comparative Example 1) When the temperature of the same molten steel was measured using a thermometer using a protection tube 1 whose outer part was made of boron nitride as a main component, the temperature of the same molten steel was measured due to melting of the protection tube after about 10 hours of temperature measurement. I became incapacitated.
（比較例 ２）
外側部分を金属モリブデン、ジルコニアセラミ
ツクス複合体を材質とする保護管１を用いた測温
計にて同一溶鋼を測温した場合には、約５時間の
測温後保護管が溶損し、測温不能となつた。(Comparative Example 2) When the temperature of the same molten steel was measured with a thermometer using the protection tube 1 whose outer part was made of metallic molybdenum and a zirconia ceramic composite, the temperature of the protection tube changed after approximately 5 hours of temperature measurement. It melted and it became impossible to measure temperature.
（実施例 ２）
第１図と同様の構成の連続測温計を用い、溶鉱
炉の出銑口近傍の樋にて1400〜1550℃の溶銑温度
を測定した。その結果、熱電対の劣化による中断
もなく約85時間にわたり精度よく正常に測温が行
われた。(Example 2) Using a continuous thermometer having a configuration similar to that shown in FIG. 1, the temperature of hot metal of 1400 to 1550°C was measured in a trough near the taphole of a blast furnace. As a result, temperature measurements were carried out normally and accurately for approximately 85 hours without any interruptions due to deterioration of the thermocouple.
（比較例 ３）
外側部分をボロンナイトライドを主成分とする
保護管１を用いた測温計にて同一溶銑を測温した
場合、約15時間の測温後保護管の溶損により、測
温不能となつた。(Comparative Example 3) When the temperature of the same hot metal was measured with a temperature meter using protection tube 1 whose outer part was made of boron nitride as a main component, the temperature of the same hot metal was measured after about 15 hours due to melting of the protection tube. I became incapacitated.
（比較例 ４）
外側部分を金属モリブデン、ジルコニアセラミ
ツクス複合体を材質とする保護管１を用いた測温
計にて同一溶銑を測温した場合には、約６時間の
測温後早くも保護管が溶損し、測温不能となつ
た。(Comparative Example 4) When the temperature of the same hot metal is measured with a thermometer using a protection tube 1 whose outer part is made of metal molybdenum and a zirconia ceramics composite, protection begins to occur as soon as after approximately 6 hours of temperature measurement. The tube was damaged and temperature measurement became impossible.
（発明の効果）
以上、詳細に説明した如く、本発明の方法によ
れば、溶銑、溶鋼等の高温溶融金属の長時間連続
測温が可能となるため、測温コストが低減し、温
度計の信頼性が大幅に向上するほか、操業、品質
の管理精度が飛躍的に向上し操業安定化、品質向
上、生産性向上等、極めて大きな効果を有するも
のである。(Effects of the Invention) As described above in detail, according to the method of the present invention, it is possible to continuously measure the temperature of high-temperature molten metals such as hot metal and molten steel for a long time, reducing the cost of temperature measurement and In addition to greatly improving the reliability of the system, it also dramatically improves the accuracy of operation and quality control, resulting in extremely significant effects such as stable operations, improved quality, and increased productivity.
また溶融金属について説明したが、これに限定
される事なく、例えば高温炉内雰囲気の測温時に
も利用できることは明白である。 Further, although the explanation has been made regarding molten metal, it is obvious that the invention is not limited to this and can also be used, for example, when measuring the temperature of the atmosphere inside a high-temperature furnace.
第１図は、本発明の保護管式連続測温計の概略
側断面図である。
１……保護管、２……内部保護管、３……絶縁
管、４……白金被覆、５……PR熱電対、６……
補償導線、７……温度記録計。
FIG. 1 is a schematic side sectional view of a protection tube type continuous thermometer of the present invention. 1... Protection tube, 2... Internal protection tube, 3... Insulation tube, 4... Platinum coating, 5... PR thermocouple, 6...
Compensation conductor, 7...Temperature recorder.
Claims (1)
内部にアルミナを主成分とする保護管を配し最内
部にアルミナを主成分とする絶縁管を配し、該絶
縁管の先端感熱部近傍を、貴金属にて被覆した測
温センサーを配したことを特徴とする保護管式連
続測温計。1. A protection tube mainly composed of alumina is arranged inside a protection tube mainly composed of boride-based ceramics, and an insulating tube mainly composed of alumina is arranged inside, and the vicinity of the heat-sensitive part at the tip of the insulating tube is , a protection tube type continuous thermometer featuring a temperature sensor coated with precious metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12822688A JPH01299423A (en) | 1988-05-27 | 1988-05-27 | Protective-tube type meter for continuous temperature measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12822688A JPH01299423A (en) | 1988-05-27 | 1988-05-27 | Protective-tube type meter for continuous temperature measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01299423A JPH01299423A (en) | 1989-12-04 |
| JPH0574014B2 true JPH0574014B2 (en) | 1993-10-15 |
Family
ID=14979615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12822688A Granted JPH01299423A (en) | 1988-05-27 | 1988-05-27 | Protective-tube type meter for continuous temperature measurement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01299423A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02176430A (en) * | 1988-12-27 | 1990-07-09 | Furuya Kinzoku:Kk | Method for preventing deterioration of thermocouple used for high temperature |
| JP2632232B2 (en) * | 1990-06-04 | 1997-07-23 | 日揮 株式会社 | Thermocouple with thermowell |
| US5399019A (en) * | 1993-07-26 | 1995-03-21 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Method and apparatus for measuring temperatures in fabrics and flexible thermal insulations |
| US7080941B1 (en) * | 2001-11-13 | 2006-07-25 | Lam Research Corporation | Temperature sensing system for temperature measurement in a high radio frequency environment |
| KR100645948B1 (en) * | 2005-05-17 | 2006-11-14 | 신승도 | Microwave Sintering Furnace with Precision Temperature Control |
| DE102008001243A1 (en) * | 2008-04-17 | 2009-10-22 | Wika Alexander Wiegand Gmbh & Co. Kg | Sensor with short response time |
| FR3096134B1 (en) * | 2019-05-16 | 2021-05-28 | Commissariat Energie Atomique | High temperature measuring device suitable for a corrosive metallic and oxide environment in the liquid state |
-
1988
- 1988-05-27 JP JP12822688A patent/JPH01299423A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01299423A (en) | 1989-12-04 |
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