JPH01299424A - Damage preventing method of protective-tube type meter for continuous temperature measurement - Google Patents
Damage preventing method of protective-tube type meter for continuous temperature measurementInfo
- Publication number
- JPH01299424A JPH01299424A JP12822788A JP12822788A JPH01299424A JP H01299424 A JPH01299424 A JP H01299424A JP 12822788 A JP12822788 A JP 12822788A JP 12822788 A JP12822788 A JP 12822788A JP H01299424 A JPH01299424 A JP H01299424A
- Authority
- JP
- Japan
- Prior art keywords
- protective tube
- molten metal
- temperature
- temperature measurement
- protective
- 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
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 35
- 239000002184 metal Substances 0.000 claims abstract description 35
- 230000001681 protective effect Effects 0.000 claims abstract description 24
- 239000000919 ceramic Substances 0.000 claims abstract description 9
- 230000003628 erosive effect Effects 0.000 abstract description 11
- 239000004020 conductor Substances 0.000 abstract description 2
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000470 constituent Substances 0.000 abstract 1
- 238000007598 dipping method Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 8
- 239000002893 slag Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229910007948 ZrB2 Inorganic materials 0.000 description 2
- VWZIXVXBCBBRGP-UHFFFAOYSA-N boron;zirconium Chemical compound B#[Zr]#B VWZIXVXBCBBRGP-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 239000006210 lotion Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- QYEXBYZXHDUPRC-UHFFFAOYSA-N B#[Ti]#B Chemical compound B#[Ti]#B QYEXBYZXHDUPRC-UHFFFAOYSA-N 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910033181 TiB2 Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000006263 metalation reaction Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
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
式連続測温計の損傷防止方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for preventing damage 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
消耗型温度針であり、・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回毎に温度計
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１−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。(Prior art) Conventionally, radiation thermometers, optical pyrometers, thermocouple thermometers, etc. have been provided as methods for measuring the temperature of high-temperature molten metals such as hot metal and molten steel. A thermometer is preferred, and the most commonly used is a consumable temperature needle with the tip of a platinum-rhodium thermocouple (hereinafter referred to as PR thermocouple) protected by a quartz tube. Usually used for hot metal, molten steel, etc. If the thermocouple is immersed in water, the heat-sensitive part will melt in a very short time (10 to 20 seconds) and become unusable. The thermometer needed to be replaced. For this reason, it is difficult to control quality and operation, and the temperature measurement cost 1- is high, so a thermometer that can continuously measure temperature for a long time is strongly desired.
かかる浸漬型温度計の保護管として、例えば、実開昭５
５−３８２９０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、金属モリブテン
、ジルコニアセラミックス複合体を材質とした保護管が
提供されている。As a protection tube for such an immersion type thermometer, for example,
As shown in No. 5-38290, the outer part to be inserted into the high-temperature temperature measurement atmosphere is mainly composed of boron nitride, and in others, a composite of metallic molybdenum and zirconia ceramics is used. Protective tubes made of material are provided.
しかし、之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、肉厚１５＋ｎｎもの保護管を用い
ても、５〜１０時間にて保護管が溶銑、溶鋼にて侵食さ
れ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
ックが提供されている。このような硼化物系セラミック
の材料としては、ＺｒＢ２、ＴｉＢ２、ＴＵＢ、などが
ある。However, in the case of thermometers using these protective tubes, hot metal,
For continuous temperature measurement of molten steel, even if a protection tube with a wall thickness of 15+nn is used, the life is insufficient because the protection tube is corroded by hot metal and molten steel in 5 to 10 hours. However, recently, materials that are preferred for such protective tubes, namely those with the best corrosion resistance against molten metals such as hot metal and molten steel, and with sufficient strength, have been developed.
Boride ceramics have been provided as having heat resistance and thermal conductivity. Examples of such boride ceramic materials include ZrB2, TiB2, TUB, and the like.
特にＺｒＢ、は前記の材質条件を最も具備している。In particular, ZrB most satisfies the above-mentioned material conditions.
（発明が解決しようとする１ｍ）
しかるに、この硼化物系セラミックは、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
酸化しやすい。また、高温下で溶融スラグ、特にＣａＯ
１Ａｌ、０．．５ｉｎ２等の酸化物に対して侵食され易
い。このため、溶銑、溶鋼等の溶融金属の温度を連続的
に測定した場合、該溶融金属の場面近傍では、上記の溶
融スラグが浮遊し、かつ保護管の気液界面では酸化が激
しく。(1m to be solved by the invention) However, since this boride-based ceramic has non-oxide as its main component, when it is used as a protective tube material, it is easily oxidized at high temperatures. In addition, molten slag, especially CaO
1Al, 0. ．． Easily attacked by oxides such as 5in2. For this reason, when the temperature of molten metal such as hot pig iron or molten steel is continuously measured, the above-mentioned molten slag floats in the vicinity of the molten metal, and oxidation is intense at the gas-liquid interface of the protection tube.
保護管材質の組織が脆弱化し、更に溶融金属の流動によ
る二ローションの影響もあることにより、この部分の保
護管の局部的な侵食量が著しく、硼化物系セラミックの
本来の溶融金属に対する耐食性から期待される寿命に比
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
、長時間にわたって測温可能な方法が強く望まれていた
。Due to the weakening of the structure of the protective tube material and the influence of the two lotions caused by the flow of molten metal, the amount of local corrosion of the protective tube in this area is significant, and the corrosion resistance of boride ceramics to molten metal is deteriorated. There is a problem in that temperature measurement becomes impossible in a very short time compared to the expected lifespan, and a method that can measure temperature over a long period of time has been strongly desired.
（課題を解決するための手段、作用）
本発明の要旨は、硼化物系セラミックを主成分とする保
護管にて測温用センサーを保護しつつ溶融金属に浸漬し
測温する測温計を、測温中に溶融金属中にて上昇又は下
降もしくは上昇下降を行いかつ保護管の長手方向の軸を
中心に回転することを特徴とする保護管式連続測温計の
損傷防止方法にある。(Means and effects for solving the problem) The gist of the present invention is to provide a thermometer that measures temperature by immersing it in molten metal while protecting the temperature sensor with a protective tube mainly made of boride ceramic. , a method for preventing damage to a protection tube type continuous thermometer, which is characterized in that the thermometer rises or descends or rises and falls in molten metal during temperature measurement, and rotates around an axis in the longitudinal direction of the protection tube.
保護管の材質としては、前記のように硼化物セラミック
特にＺｒＢ２が好ましいが、非酸化物を主成分とするた
め、高温で酸化しやすく、また、高温下で溶融スラグ、
特にＣａ ０１ＡＩ２０．、ＳｉＯ２等の酸化物に対し
て侵食され易い。As mentioned above, boride ceramics, particularly ZrB2, are preferable as the material for the protective tube, but since they are mainly composed of non-oxides, they are easily oxidized at high temperatures, and molten slag,
Especially Ca01AI20. , easily attacked by oxides such as SiO2.
通常、高炉や連続鋳造設備等において、溶銑、溶鋼等の
溶融金属を測温する場合、湯面部には溶融スラグが多く
浮遊し、かつ湯面付近の保護管温度は１４００℃を越え
る高温となり酸化し易い。Normally, when measuring the temperature of molten metal such as hot metal or molten steel in blast furnaces or continuous casting equipment, a large amount of molten slag floats on the surface of the hot water, and the temperature of the protection tube near the surface of the hot water exceeds 1400°C, causing oxidation. Easy to do.
また、タンデイツシュや樋は流路断面積に比べ水平方向
の長さの大きい容器であるため、溶融金属の流動が激し
い。したがって、保護管の場面近傍の一部分が局部的に
侵食されることにより、極めて短時間のうちに測温を中
断せざるを得ない場合が多い。In addition, since the tundish and the gutter are containers whose length in the horizontal direction is larger than the cross-sectional area of the flow path, the molten metal flows rapidly. Therefore, due to local erosion of a portion of the protection tube near the site, temperature measurement is often forced to be interrupted within an extremely short period of time.
しかして、局部損傷の防止手段について、本発明者等が
多数の実験の結果、長時間同一位置を溶融スラグと接触
させないこと、かつ同一位置を気液界面に位置させない
ことが酸化物系スラブによる侵食の防止と、気液界面で
の高温酸化に対し有効であることを知見した。As a means of preventing local damage, the present inventors have conducted numerous experiments and found that it is important to avoid contacting the same position with molten slag for a long period of time, and to avoid placing the same position at the gas-liquid interface. It was found that it is effective in preventing corrosion and high-temperature oxidation at the gas-liquid interface.
そして、測温中に保護管を上昇又は下降あるいは上下動
をくり返すことが最も簡便な解決策であること、更に、
流動による二ローションの防止についても、同一面を長
時間流動に対向させないことが重要で、保護管の長手方
向の軸を中心に回動することが最も簡便な解決策である
ことを見い出したものである。Furthermore, the simplest solution is to raise or lower the protective tube or repeatedly move it up and down during temperature measurement;
Regarding the prevention of two lotions due to flow, it is important not to leave the same surface facing the flow for a long time, and we have found that the simplest solution is to rotate the protective tube around the longitudinal axis. It is.
測温計を上下する速度、距離、一方向あるいは往復運動
等については、侵食位置の変更による侵食量の均一化が
できる限り特に規定するところではないが、少なくとも
溶融金属の正しい温度が測定できる範囲に、測温部を位
置することが必要である。また、回転についても、回転
数等は侵食位置の変更による侵食量の均一化ができる限
り特に規定するところではない。Regarding the speed, distance, unidirectional or reciprocating movement of the thermometer, there are no particular regulations as long as the amount of erosion can be made uniform by changing the erosion position, but at least it must be within a range where the correct temperature of the molten metal can be measured. It is necessary to locate the temperature measuring unit at Further, regarding the rotation, the number of rotations and the like are not particularly specified as long as the amount of erosion can be made uniform by changing the erosion position.
（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、硼化物セラミックＺｒ
Ｂ２を主成分とする保護管１の内部にＰＲＰ！、電対２
を配設し、該熱電対の端子は、補償導線３を用いて、温
度記録計４に接続されている。(Example 1) As shown in Fig. 1, the thermometer was made of boride ceramic Zr.
PRP inside the protection tube 1 whose main component is B2! , Electrocouple 2
The terminal of the thermocouple is connected to a temperature recorder 4 using a compensating conductor 3.
このような構成の温度計を用い、溶銑、溶鋼等の溶融金
属の温度を測定するが、溶融金属浸漬時、湯面近傍の保
護管の局部的な侵食を防止するため、第２図に示すよう
に、保護管上部の接続端子箱５を支持しつつ保護管を昇
降、回転させる支持装置６により、該保護管を昇降、回
転させる。A thermometer with such a configuration is used to measure the temperature of molten metal such as hot metal or molten steel, but in order to prevent local erosion of the protective tube near the molten metal surface when immersed in molten metal, the thermometer shown in Figure 2 is used to measure the temperature of molten metal such as hot metal or molten steel. The protective tube is raised, lowered, and rotated by a support device 6 that raises, lowers, and rotates the protective tube while supporting the connecting terminal box 5 on the upper part of the protective tube.
このような構成の連続測温計を用い、連続鋳造設備のタ
ンデイツシュ内にて、１５２０〜１５８０℃の溶鋼温度
を測定した。その際、第２図の昇降、回転支持装置を用
い、昇降速度５〜１ｏｎｏ／時、回転数１〜５回／時に
て昇降、回転を実施した。保護管の肉厚は５Ｉとした。Using a continuous thermometer having such a configuration, the temperature of molten steel of 1520 to 1580°C was measured in a tundish of a continuous casting facility. At that time, the lifting and lowering and rotation were carried out using the lifting and rotating support device shown in FIG. 2 at a lifting speed of 5 to 1 ono/hour and a rotational speed of 1 to 5 times/hour. The wall thickness of the protective tube was 5I.
その結果、保護管の局部的な侵食による中断もなく約７
０時間にわたり精度よく正常に測温か行われた。As a result, there was no interruption due to local erosion of the protection tube, and the
Temperature measurement was performed normally and accurately for 0 hours.
（比較例１）
同様の材質を用いた保護管にて昇降、回転を行わずに測
温したところ約１０時間の測温後保護管の局部的溶損、
孔あきにより、保護管内に溶鋼が侵入し、熱電対が断線
、測温不能となった。(Comparative Example 1) When temperature was measured using a protection tube made of the same material without lifting, lowering, or rotating, the protection tube was locally eroded after approximately 10 hours of temperature measurement.
Due to the hole, molten steel entered the protection tube, causing the thermocouple to break and making temperature measurement impossible.
（実施例２）
第１図と同様の構成の連続測温計と第２図の昇降、回転
支持装置を用い、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、保護管
の局部的な侵食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 with the same configuration as that shown in Fig. 1 and the lifting and rotating support device shown in Fig. 2, a 1400 m
Hot metal temperatures of ~1550°C were measured. As a result, temperature measurements were carried out normally and accurately for about 85 hours without any interruptions due to local erosion of the protection tube.
（比較例２）
同様の材質を用いた保護管にて昇降、回転を行わずに同
一温度条件で測温したところ、約１５時間の測温後、保
護管の局部的溶損により測温不能となった。(Comparative Example 2) When temperature was measured under the same temperature conditions using a protection tube made of the same material without lifting, lowering, or rotating, temperature measurement became impossible due to local melting of the protection tube after approximately 15 hours of temperature measurement. It became.
（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か可能とな
るため、′ａ温ココスト低減し、温度計の信頼性が大幅
に向上するほが、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 explained 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, thereby reducing the temperature cost and reducing the cost of thermometers. If reliability is greatly improved, the accuracy of operation and quality control will be dramatically improved, and this will have extremely large effects, such as stabilizing operations, improving quality, and improving productivity.
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。
第２図は１本発明方法を使用するための装置の説明図で
ある。
１・・・保護管 ２・・・ＰＲ熱電対３・・
・補償導線 ４・・・温度記録計５・・・接続
端子箱 ６・・・支持装置第１図FIG. 1 is a schematic side sectional view of a protection tube type continuous thermometer of the present invention. FIG. 2 is an explanatory diagram of an apparatus for using the method of the present invention. 1...Protection tube 2...PR thermocouple 3...
・Compensation lead wire 4...Temperature recorder 5...Connection terminal box 6...Support device Fig. 1
Claims (1)
ンサーを保護しつつ溶融金属に浸漬し測温する測温計を
、測温中に溶融金属中にて上昇又は下降もしくは上昇下
降を行いかつ保護管の長手方向の軸を中心に回転するこ
とを特徴とする保護管式連続測温計の損傷防止方法。The thermometer, which measures temperature by immersing it in molten metal while protecting the temperature sensor with a protective tube mainly made of boride ceramic, rises or falls in the molten metal during temperature measurement. A method for preventing damage to a protection tube type continuous thermometer, which is characterized by rotating around the longitudinal axis of the protection tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12822788A JPH01299424A (en) | 1988-05-27 | 1988-05-27 | Damage preventing method of protective-tube type meter for continuous temperature measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12822788A JPH01299424A (en) | 1988-05-27 | 1988-05-27 | Damage preventing method of protective-tube type meter for continuous temperature measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01299424A true JPH01299424A (en) | 1989-12-04 |
Family
ID=14979638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12822788A Pending JPH01299424A (en) | 1988-05-27 | 1988-05-27 | Damage preventing method of protective-tube type meter for continuous temperature measurement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01299424A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5180228A (en) * | 1989-09-18 | 1993-01-19 | Asahi Glass Company Ltd. | Radiation thermometer for molten iron and method for measuring the temperature of molten iron |
| US6050723A (en) * | 1998-04-14 | 2000-04-18 | Amra; Lutfi H. | High temperature thermocouple assembly for measuring molten metal temperatures |
| JP6010675B1 (en) * | 2015-10-01 | 2016-10-19 | 株式会社プランテック | Waste incinerator temperature detection device and waste incinerator temperature detection method |
-
1988
- 1988-05-27 JP JP12822788A patent/JPH01299424A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5180228A (en) * | 1989-09-18 | 1993-01-19 | Asahi Glass Company Ltd. | Radiation thermometer for molten iron and method for measuring the temperature of molten iron |
| US6050723A (en) * | 1998-04-14 | 2000-04-18 | Amra; Lutfi H. | High temperature thermocouple assembly for measuring molten metal temperatures |
| JP6010675B1 (en) * | 2015-10-01 | 2016-10-19 | 株式会社プランテック | Waste incinerator temperature detection device and waste incinerator temperature detection method |
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