JPH05345929A - Detection of abnormality of value registered by radiation thermometer for continuous annealing furnace - Google Patents
Detection of abnormality of value registered by radiation thermometer for continuous annealing furnaceInfo
- Publication number
- JPH05345929A JPH05345929A JP4153690A JP15369092A JPH05345929A JP H05345929 A JPH05345929 A JP H05345929A JP 4153690 A JP4153690 A JP 4153690A JP 15369092 A JP15369092 A JP 15369092A JP H05345929 A JPH05345929 A JP H05345929A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- cooling zone
- cooling
- radiation thermometer
- abnormality
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼板の連続焼鈍炉にお
ける，鋼板の温度計測のために炉内に設置された放射温
度計の指示値異常を検出する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting an abnormality in a reading value of a radiation thermometer installed in a furnace for measuring the temperature of a steel plate in a continuous annealing furnace for steel plates.
【０００２】[0002]
【従来の技術】連続焼鈍炉では、鋼板の機械的性質を変
える熱処理を行うために、鋼板温度を計測して制御する
ことが重要となる。このため、炉内に放射温度計を設置
して、その放射温度計によって炉内の鋼板温度を計測
し、それぞれの場所で測定した鋼板温度をもとに、鋼板
が目標の鋼板温度に加熱もしくは冷却されるようにフィ
ードバック制御を実施しているが、この炉内に設置され
た放射温度計は、設定環境や検出素子の経年劣化等によ
って計測誤差が大きくなり計測した指示値が異常となっ
て、炉内の鋼板に対する温度制御に不具合が発生するこ
とがある。2. Description of the Related Art In a continuous annealing furnace, it is important to measure and control the temperature of a steel sheet in order to perform a heat treatment that changes the mechanical properties of the steel sheet. For this reason, a radiation thermometer is installed in the furnace, the temperature of the steel plate in the furnace is measured by the radiation thermometer, and the steel plate is heated to the target steel plate temperature based on the steel plate temperature measured at each location. Although feedback control is performed to cool the radiation thermometer, the radiation thermometer installed in this furnace has a large measurement error due to the set environment and deterioration of the detection element over time, and the measured reading becomes abnormal. However, a problem may occur in the temperature control of the steel plate in the furnace.
【０００３】この連続焼鈍炉内に設置されて焼鈍される
鋼板の温度を検出する放射温度計の異常は、通常、黒体
炉検定による定期検査及び臨時検査によって発見され
る。しかし、この放射温度計の計測値異常の発見では、
操業を停止して定期検査や臨時検査をするときまで検出
することができないので、この指示値異常の発見が遅れ
て不良な鋼板を大量に製造する可能性がある。Abnormalities of the radiation thermometer for detecting the temperature of the steel sheet annealed by being installed in the continuous annealing furnace are usually found by the periodic inspection and the extraordinary inspection by the black body furnace inspection. However, in the discovery of abnormal measurement values of this radiation thermometer,
Since it cannot be detected until the time when the operation is stopped and the periodical inspection or the temporary inspection is performed, there is a possibility that the abnormal detection of the indicated value may be delayed and a large number of defective steel sheets may be manufactured.
【０００４】このため、操業を停止することなく、放射
温度計による指示値異常を早期検出するために、従来に
おいては、連続焼鈍炉内での各温度検出位置に、それぞ
れ放射温度計を２台ずつ設置しておき、適宜、各温度検
出位置における２台の放射温度計の値を突き合わせて各
放射温度計による指示値異常の有無を検出する方法や、
特開昭６３−２６３１５号公報に記載されているよう
に、放射温度計の設置とは別に、鋼板のパスラインに配
設されているロール内に熱電対を埋設して、その熱電対
によっても鋼板温度を計測し、同一の位置を計測してい
る放射温度計の計測値と突き合わせて、各放射温度計に
よる指示値異常の有無を検出する方法が行われている。Therefore, in order to detect the indicated value abnormality by the radiation thermometer early without stopping the operation, conventionally, two radiation thermometers are provided at each temperature detection position in the continuous annealing furnace. Each of them is installed, and the values of two radiation thermometers at each temperature detection position are appropriately matched to each other to detect the presence or absence of an indicated value abnormality by each radiation thermometer,
As described in Japanese Unexamined Patent Publication No. 63-26315, a thermocouple is embedded in a roll arranged on a pass line of a steel plate, separately from the installation of a radiation thermometer. A method of measuring the steel plate temperature and comparing it with the measurement value of a radiation thermometer measuring the same position to detect the presence or absence of an indicated value abnormality by each radiation thermometer is used.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記従
来の放射温度計からの指示値異常を検出する方法におい
て、各計測位置の放射温度計を二重化する方法にあって
は、２台の放射温度計を設置するだけの場所を確保する
必要があり、その設置場所によっては他の部品や鋼板に
干渉しないように２台の放射温度計を設置することが難
しく、放射温度計を二重化して設置できないことがある
という問題がある。However, in the method of detecting an abnormal indication value from the conventional radiation thermometer, in the method of duplicating the radiation thermometers at the respective measurement positions, two radiation thermometers are used. It is difficult to install two radiation thermometers so that they do not interfere with other parts and steel plates depending on the installation location, and it is not possible to install dual radiation thermometers. There is a problem.
【０００６】また、ロールによる測温を実施する方法に
おいては、ロール内に埋設した熱電対を検定することが
できないために、長期に渡って使用する場合には、ロー
ル内に埋設された熱電対の精度が保証されないという問
題がある。本発明は、上記のような問題点に着目してな
されたもので、放射温度計を２重化したり、別に熱電対
を設置したりすることなく、しかも、操業に支障を与え
ることなくして、早期に放射温度計からの指示値異常を
検出することを目的としている。Further, in the method of measuring the temperature by the roll, since the thermocouple embedded in the roll cannot be verified, the thermocouple embedded in the roll is used when it is used for a long period of time. There is a problem that the accuracy of is not guaranteed. The present invention has been made by paying attention to the problems as described above, without duplicating the radiation thermometer or installing a separate thermocouple, and further, without impairing the operation, The purpose is to detect an abnormal indicator value from the radiation thermometer at an early stage.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明の連続焼鈍炉における放射温度計の指示値異
常検出方法は、加熱帯及びそれに続く冷却帯を備えた連
続焼鈍炉における冷却帯の入側及び出側に設置された放
射温度計の指示値異常を検出する方法において、冷却帯
の入側に設置された放射温度計にて計測した鋼板の温度
から、その冷却帯の冷却能力、鋼板の性状、及びパスラ
インの速度をもとに、その冷却帯の出側での上記鋼板の
温度を推定し、その推定値と、出側に設置された放射温
度計で計測した上記鋼板の温度計測値とを突き合わせる
ことを特徴としている。In order to achieve the above object, the method for detecting an abnormal indication value of a radiation thermometer in a continuous annealing furnace of the present invention is a cooling in a continuous annealing furnace provided with a heating zone and a subsequent cooling zone. In the method for detecting anomalous readings of the radiation thermometers installed on the inlet and outlet sides of the strip, the cooling of that cooling zone is based on the temperature of the steel plate measured by the radiation thermometer installed on the inlet side of the cooling zone. Based on the capacity, the properties of the steel plate, and the speed of the pass line, the temperature of the steel plate on the outlet side of the cooling zone is estimated, and the estimated value and the radiation thermometer installed on the outlet side are measured. It is characterized by matching the temperature measurement value of the steel plate.
【０００８】このとき、連続する少なくとも２つの冷却
帯に対して、上記入側の温度からの推定値と出側での計
測値とを突き合わせて、特定の放射温度計の指示値が異
常かどうか判定するとよい。At this time, the estimated value from the temperature on the inlet side and the measured value on the outlet side are compared with each other for at least two continuous cooling zones to determine whether the indicated value of the specific radiation thermometer is abnormal. Good to judge.
【０００９】[0009]
【作用】各冷却帯において、冷却能力の要因の一つであ
る冷却ガスの圧力と熱伝導率との関係は、冷却帯の冷却
能力の設定によって下式で表される。 α ＝ａ・Ｐb ・・・（１） ここで、 α（ｋｃａｌ／ｍ2 ｈ℃）：対流熱伝導率 Ｐ（ｍｍＨ2 Ｏ） ：冷却ガス圧力 ａ，ｂ ：定数 をそれぞれ表している。In each cooling zone, the relationship between the pressure of the cooling gas and the thermal conductivity, which is one of the factors of the cooling ability, is expressed by the following equation depending on the setting of the cooling ability of the cooling zone. α = a · P b (1) where α (kcal / m 2 h ° C.): convective thermal conductivity P (mmH 2 O): cooling gas pressure a, b: constants, respectively.
【００１０】また、ライン速度，鋼板の板厚等の性状，
及び冷却帯の入側及び出側の鋼板温度と、対流熱伝導率
との関係は、対流熱伝達の基本式を解くことで、下式で
表される。 ここで、 Ｔi （℃）：冷却帯入側での鋼板温度 Ｔo （℃）：冷却帯出側での鋼板温度 Ｔg （℃）：冷却ガス温度 Ｌ （ｍ）：冷却帯の長さ ρS （ｋｇ／ｍ3 ）：板の密度 ＣPS（ｋｃａｌ／ｋｇ・℃）：板の比熱 ＬＳ（ｍ／ｈ）：ライン速度 Ｄ（ｍ）：板厚 をそれぞれ表している。Further, properties such as line speed, plate thickness of steel plate,
The relationship between the steel plate temperatures on the inlet and outlet sides of the cooling zone and the convective heat conductivity is expressed by the following equation by solving the basic equation for convective heat transfer. Here, T i (℃): temperature of the steel strip T o in the cooling zone inlet side (° C.): the steel sheet temperature T g of the the cooling home use side (° C.): Cooling gas temperature L (m): length of the cooling zone ρ S (kg / m 3 ): Plate density C PS (kcal / kg · ° C): Specific heat of plate LS (m / h): Line speed D (m): Plate thickness, respectively.
【００１１】この上記２式から熱伝導率を消去すると、
下式のように表すことができる。 この式から分かるように、各冷却帯の冷却能力の要因で
ある冷却ガスの温度（Ｔg ），圧力（Ｐ），及び冷却帯
の長さ（Ｌ）と、鋼板の密度（ρS ），比熱（ＣPS），
及び板厚（Ｄ）と、ラインの速度（ＬＳ）とを予め求め
ておくことによって、各冷却帯の入側の鋼板温度
（Ｔg ）から、出側での鋼板温度（Ｔo ） を推定する
ことができる。Eliminating the thermal conductivity from the above two equations,
It can be expressed as: As can be seen from this equation, the temperature (T g ) of cooling gas, the pressure (P), and the length (L) of the cooling zone, which are the factors of the cooling capacity of each cooling zone, and the density (ρ S ) of the steel sheet, Specific heat (C PS ),
And the plate thickness (D) and the line speed (LS) are obtained in advance to obtain the steel plate temperature (T o ) from the steel plate temperature (T g ) on the inlet side to the steel plate (T o ) on the outlet side of each cooling zone. Can be estimated.
【００１２】そして、このことを利用することにより、
各冷却帯における入側に設置された放射温度計にて計測
した鋼板温度をもとに、上記（３）式から出側の鋼板温
度を推定し、且つ、出側に設置した放射温度計にて出側
での鋼板の温度を計測し、その推定した出側での鋼板温
度と実際に計測した鋼板温度を突き合わせることで、そ
の差が所定の許容差であれば、冷却帯入側及び出側に設
置した両放射温度計の指示値に異常が発生していないこ
とがわかり、また、上記出側鋼板温度の推定値と実際に
計測値の差が許容差以上であれば、少なくとも上記両放
射温度計のうち，一方の指示値が異常になっていること
が検知できる。And by utilizing this,
Based on the steel plate temperature measured by the radiation thermometer installed on the inlet side in each cooling zone, the steel plate temperature on the outlet side is estimated from the above formula (3), and the radiation thermometer installed on the outlet side is estimated. By measuring the temperature of the steel sheet on the outlet side and comparing the estimated steel sheet temperature on the outlet side with the actually measured steel sheet temperature, if the difference is a predetermined tolerance, the cooling zone inlet side and If it is found that there is no abnormality in the indicated values of both radiation thermometers installed on the exit side, and if the difference between the estimated value of the exit side steel plate temperature and the actual measured value is not less than the allowable difference, at least the above One of the two radiation thermometers can detect that the indicated value is abnormal.
【００１３】この判定を連続する２つの冷却帯について
実施するとよい。このとき、上流側の冷却帯の出側が下
流側の冷却帯の入側となり、同じ放射温度計で計測され
る。すると、上流側の冷却帯の出側での推定値と計測値
との差が許容差より大きく、且つ、下流側の冷却帯の出
側での推定値と計測値との差が許容差内と判断される
と、上流側の冷却帯の入側に設定されている放射温度計
からの指示値が異常であることが検知される。It is advisable to carry out this determination for two consecutive cooling zones. At this time, the outlet side of the upstream cooling zone becomes the inlet side of the downstream cooling zone, and the same radiation thermometer is used for measurement. Then, the difference between the estimated value and the measured value at the outlet side of the upstream cooling zone is larger than the allowable difference, and the difference between the estimated value and the measured value at the outlet side of the downstream cooling zone is within the allowable difference. If it is determined that the indicated value from the radiation thermometer set on the inlet side of the upstream cooling zone is abnormal.
【００１４】また、上流側の冷却帯の出側での推定値と
計測値との差が許容差内と判断され、且つ、下流側の冷
却帯の出側での推定値と計測値との差が許容差より大き
いと判断されると、下流側の冷却帯の出側に設置されて
いる放射温度計からの指示値が異常であることが検知さ
れる。また、上流側の冷却帯の出側での推定値と計測値
との差が許容差より大きいと判断され、且つ、下流側の
冷却帯の出側での推定値と計測値との差が許容差より大
きいと判断されると、２つ以上の放射温度計からの指示
値が異常か、若しくは上流側の冷却帯の出側（下流側の
冷却帯の入側）に設置された放射温度計からの指示値が
異常と検知される。但し、２つ以上の放射温度計が一度
に異常となることはまれなので、この場合には、上流側
の冷却帯の出側（下流側の冷却帯の入側）に設置された
放射温度計の指示値が異常であるとみなすことができ
る。Further, it is determined that the difference between the estimated value and the measured value at the outlet side of the upstream cooling zone is within the tolerance, and the estimated value and the measured value at the outlet side of the downstream cooling zone. When it is determined that the difference is larger than the allowable difference, it is detected that the indicated value from the radiation thermometer installed on the outlet side of the cooling zone on the downstream side is abnormal. Further, it is determined that the difference between the estimated value and the measured value on the outlet side of the upstream cooling zone is larger than the allowable difference, and the difference between the estimated value and the measured value on the outlet side of the downstream cooling zone is If it is judged to be larger than the allowable difference, the readings from two or more radiation thermometers are abnormal, or the radiation temperature installed on the outlet side of the upstream cooling zone (the inlet side of the downstream cooling zone). The indicated value from the meter is detected as abnormal. However, it is rare for two or more radiation thermometers to malfunction at one time, so in this case, the radiation thermometers installed on the outlet side of the upstream cooling zone (the inlet side of the downstream cooling zone) The indicated value of can be regarded as abnormal.
【００１５】[0015]
【実施例】本発明の実施例を図面に基づいて説明する。
まず構成を説明すると、図１に示すように、図示しない
加熱帯の出側に第１冷却帯１の入側１ａが連通し、その
第１冷却帯１の出側１ｂに第２冷却帯２の入側２ａが連
通し、その両冷却帯１，２内を、加熱帯で加熱された鋼
板３が搬送用ロールに案内されて通過するようになって
いる。Embodiments of the present invention will be described with reference to the drawings.
First, as shown in FIG. 1, the inlet side 1a of the first cooling zone 1 communicates with the outlet side of a heating zone (not shown), and the outlet side 1b of the first cooling zone 1 has a second cooling zone 2 as shown in FIG. The inlet side 2a of the steel sheet is communicated with each other, and the steel plate 3 heated by the heating zone is guided by the transport roll and passes through the inside of the both cooling zones 1 and 2.
【００１６】そして、図示しない空気等からなる冷却ガ
スが、調整弁４で圧力を調整され、それに続くファン５
によって所定の風速にされて上記冷却帯１，２内にそれ
ぞれ送り込まれて、該各冷却帯１，２を通過する鋼板３
を所定の冷却能力で冷却している。上記調整弁４は、冷
却ガス圧力制御装置６によってその開度が制御されてい
る。また、上記各冷却帯１，２に送られる冷却ガスは、
圧力計７にてその圧力を計測されると共に、冷却ガス温
度計８にてその温度が計測されている。その圧力及び温
度を計測している圧力計７及び冷却ガス温度計８は異常
検出装置９に接続されて、それぞれ、冷却帯に送られる
冷却ガスの圧力，及び温度に応じた信号を該異常検出装
置９に供給している。Then, the pressure of a cooling gas such as air (not shown) is adjusted by the adjusting valve 4, and the fan 5 following it is adjusted.
Steel plate 3 which has a predetermined wind speed and is fed into the cooling zones 1 and 2, respectively, and passes through the cooling zones 1 and 2.
Are cooled with a predetermined cooling capacity. The opening of the adjusting valve 4 is controlled by the cooling gas pressure control device 6. Further, the cooling gas sent to each of the cooling zones 1 and 2 is
The pressure is measured by the pressure gauge 7, and the temperature is measured by the cooling gas thermometer 8. The pressure gauge 7 and the cooling gas thermometer 8 that measure the pressure and temperature are connected to the abnormality detection device 9, and the abnormality detection device 9 outputs signals corresponding to the pressure and temperature of the cooling gas sent to the cooling zone, respectively. It is supplied to the device 9.
【００１７】また、図示しない加熱帯の出側，即ち第１
冷却帯１の入側１ａ、第１冷却帯１の出側１ｂ，即ち第
２冷却帯２の入側２ａ、及び第２冷却帯２の出側２ｂの
合計３箇所に、通過する鋼板３の温度を計測する放射温
度計１０，１１，１２がそれぞれ配設されている。その
３台の放射温度計１０，１１，１２は異常検出装置９に
接続されて、計測した各設置場所での鋼板温度に応じた
温度信号を、夫々、異常検出装置９に供給している。The outlet side of the heating zone (not shown), that is, the first side
The inlet side 1 a of the cooling zone 1, the outlet side 1 b of the first cooling zone 1, that is, the inlet side 2 a of the second cooling zone 2 and the outlet side 2 b of the second cooling zone 2 have a total of three places, and the steel plates 3 passing therethrough are Radiation thermometers 10, 11 and 12 for measuring the temperature are respectively provided. The three radiation thermometers 10, 11 and 12 are connected to the abnormality detecting device 9 and supply the abnormality detecting device 9 with temperature signals corresponding to the measured steel plate temperatures at the respective installation locations.
【００１８】また、第１冷却帯１の出側１ｂに配設され
ている放射温度計１１は、計測した温度信号を温度制御
装置１４にも送り、その温度制御装置１４が、第１冷却
帯１の出側１ｂにおける鋼板温度が目標値に近づくよう
に、偏差値を第１冷却帯１の冷却ガス圧力制御装置６に
フィードバックし、該冷却ガス圧力制御装置６が圧力計
７の出力値を参照しつつ調整弁４の開度を調整してい
る。Further, the radiation thermometer 11 arranged on the outlet side 1b of the first cooling zone 1 also sends the measured temperature signal to the temperature control device 14, and the temperature control device 14 causes the first cooling zone 1 to operate. The deviation value is fed back to the cooling gas pressure control device 6 in the first cooling zone 1 so that the steel plate temperature on the delivery side 1b of 1 approaches the target value, and the cooling gas pressure control device 6 outputs the output value of the pressure gauge 7. The opening degree of the adjusting valve 4 is adjusted while referring to it.
【００１９】同様に、第２冷却帯２の出側２ｂに配設さ
れている放射温度計１２は、計測した温度信号を温度制
御装置１５にも送り、その温度制御装置１５が、第２冷
却帯２の出側２ｂにおける鋼板温度が目標値に近づくよ
うに、偏差値を第２冷却帯２の冷却ガス圧力制御装置６
にフィードバックし、該冷却ガス圧力制御装置６が圧力
計７の出力値を参照しつつ調整弁４の開度を調整してい
る。Similarly, the radiation thermometer 12 disposed on the outlet side 2b of the second cooling zone 2 also sends the measured temperature signal to the temperature control device 15, and the temperature control device 15 then performs the second cooling. The deviation value is set to the cooling gas pressure control device 6 of the second cooling zone 2 so that the steel plate temperature on the outlet side 2b of the zone 2 approaches the target value.
And the cooling gas pressure control device 6 refers to the output value of the pressure gauge 7 to adjust the opening degree of the adjusting valve 4.
【００２０】また、異常検出装置９は、上記各装置から
入力した信号をもとに、３つの放射温度計１０，１１，
１２からの指示値に異常が発生していないかどうか、所
定時間毎に、その３つの放射温度計１０，１１，１２に
よる計測値を入力し後述する手順でその値が異常どうか
検査して、若し異常が検知されたら、警報出力装置１６
にその検知した異常信号を伝達するようになっている。Further, the abnormality detecting device 9 uses three radiation thermometers 10, 11 and 11 based on the signals input from the above devices.
If there is no abnormality in the indicated value from 12, the measured values by the three radiation thermometers 10, 11 and 12 are input at every predetermined time, and the value is inspected according to the procedure described later, If an abnormality is detected, the alarm output device 16
The detected abnormal signal is transmitted to.
【００２１】そして、上記のような構成では、図示しな
い加熱帯で加熱された鋼板３が搬送ロールに案内されて
第１冷却帯１，第２冷却帯２を順に通過し、その通過中
に冷却ガスによって所定の温度に徐々に冷却されてい
く。このとき、通過する鋼板３の温度が、目標温度にな
っているか確認するために３台の放射温度計１０，１
１，１２によってそれぞれ計測されて、１番目の放射温
度計１０による計測温度とその位置での目標値との偏差
を、図示しない加熱帯を加熱制御する制御装置にフィー
ドバックし、２番目の放射温度計１１による計測温度と
その位置での目標値との偏差を、第１冷却帯１の冷却を
制御している冷却ガス圧力制御装置６にフィードバック
し、３番目の放射温度計１３による計測温度とその位置
での目標値との偏差を、第２冷却帯２の冷却を制御して
いる冷却ガス圧力制御装置６にフィードバックして、加
熱帯及び各冷却帯１，２を通過する鋼板３の温度が所定
温度に加熱若しくは冷却するようにフィードバック制御
して不良のない所望の焼きなましを施している。In the above structure, the steel sheet 3 heated in the heating zone (not shown) is guided by the conveying rolls to sequentially pass through the first cooling zone 1 and the second cooling zone 2, and is cooled during the passage. The gas is gradually cooled to a predetermined temperature. At this time, in order to confirm that the temperature of the passing steel plate 3 is the target temperature, three radiation thermometers 10, 1 are used.
The difference between the temperature measured by the first radiation thermometer 10 and the target value at that position is fed back to the control device (not shown) for heating and controlling the heating zone, and the second radiation temperature is measured. The deviation between the temperature measured by the meter 11 and the target value at that position is fed back to the cooling gas pressure control device 6 controlling the cooling of the first cooling zone 1 and the temperature measured by the third radiation thermometer 13 is measured. The deviation from the target value at that position is fed back to the cooling gas pressure control device 6 that controls the cooling of the second cooling zone 2, and the temperature of the steel plate 3 passing through the heating zone and the cooling zones 1 and 2 is fed back. Feedback control is performed so as to heat or cool to a predetermined temperature, and desired annealing without defect is performed.
【００２２】このため、上記３つの放射温度計１０，１
１，１２による鋼板温度の指示値が異常であると、所望
の焼きなましが施されずに不良な鋼板３が形成される。
このため、早期の上記放射温度計１０，１１，１２の異
常を検出する必要がある。本実施例においては、その検
出を異常検出装置９にて実施している。その処理を次に
説明する。Therefore, the above three radiation thermometers 10, 1
If the indicated values of the steel plate temperature by 1 and 12 are abnormal, the desired annealing is not performed and the defective steel plate 3 is formed.
Therefore, it is necessary to detect the abnormality of the radiation thermometers 10, 11, 12 at an early stage. In the present embodiment, the detection is performed by the abnormality detection device 9. The processing will be described below.
【００２３】ここで、各冷却帯１，２の入側１ａ，２ａ
の鋼板温度Ｔi が計測されると、下式によって、その冷
却帯の出側１ｂ，２ｂでの鋼板温度Ｔo を推定すること
ができる。 ここで、 Ｔi （℃）：冷却帯入側１ａ，２ａでの鋼板温度 Ｔo （℃）：冷却帯出側１ｂ，２ｂでの鋼板温度 Ｔg （℃）：冷却ガス温度 Ｌ （ｍ）：冷却帯の長さ ρS （ｋｇ／ｍ3 ）：鋼板の密度 ＣPS（ｋｃａｌ／ｋｇ・℃）：鋼板の比熱 ＬＳ（ｍ／ｈ）：ライン速度 Ｄ（ｍ）：板厚 Ｐ（ｍｍＨ2 Ｏ）：冷却ガス圧力 ａ，ｂ ：定数 をそれぞれ表している。Here, the inlet sides 1a, 2a of the respective cooling zones 1, 2
When the steel plate temperature T i is measured, the steel plate temperature T o at the outlet sides 1b and 2b of the cooling zone can be estimated by the following formula. Here, T i (℃): cooling zone entry side 1a, 2a temperature of the steel sheet at T o (℃): Cooling home use side 1b, the steel plate temperature at 2b T g (℃): Cooling gas temperature L (m): Length of cooling zone ρ S (kg / m 3 ): Density of steel sheet C PS (kcal / kg · ° C): Specific heat of steel sheet LS (m / h): Line speed D (m): Plate thickness P (mmH 2 O): Cooling gas pressure a, b: Constants, respectively.
【００２４】また、上記の値のうち、定数ａ，ｂと、ラ
イン速度ＬＳと、各冷却帯の長さＬと、鋼板３の密度ρ
S ，比熱ＣPS，及び板厚Ｄは、予め異常検出装置９に設
定されている。異常検出装置９は、図２に示すように、
所定時間，例えば２０秒経過する度（ステップ１）に下
記処理を実施する。Among the above values, the constants a and b, the line speed LS, the length L of each cooling zone, and the density ρ of the steel plate 3
The S , the specific heat C PS , and the plate thickness D are set in the abnormality detecting device 9 in advance. The abnormality detection device 9 is, as shown in FIG.
The following processing is performed every time a predetermined time, for example, 20 seconds has elapsed (step 1).
【００２５】まず、第１冷却帯１に送られる冷却ガスの
温度Ｔg 及び圧力Ｐを冷却ガス温度計８及び圧力計７か
ら入力し（ステップ２）、且つ、第１の放射温度計１０
から第１冷却帯１の入側１ａに位置する鋼板温度Ｔi の
計測温度をサンプル値として入力して（ステップ３）、
現在計測した鋼板３の第１冷却帯１の出側１ｂでの鋼板
温度ＴO を推定する（ステップ４）と共に、第２冷却帯
２に送られる冷却ガスの温度Ｔg 及び圧力Ｐを冷却ガス
温度計８及び圧力計７から入力し（ステップ５）、且
つ、第２の放射温度計１１から第２冷却帯２の入側２ａ
に位置する鋼板温度Ｔi の放射温度をサンプル値として
入力して（ステップ６）、現在計測した鋼板３の第２冷
却帯２の出側２ｂでの鋼板温度ＴO を推定する（ステッ
プ７）。First, the temperature T g and the pressure P of the cooling gas sent to the first cooling zone 1 are input from the cooling gas thermometer 8 and the pressure gauge 7 (step 2), and the first radiation thermometer 10
To the measured temperature of the steel plate temperature T i located on the inlet side 1a of the first cooling zone 1 as a sample value (step 3),
The currently measured steel plate temperature T O at the outlet side 1b of the first cooling zone 1 of the steel plate 3 is estimated (step 4), and the temperature T g and pressure P of the cooling gas sent to the second cooling zone 2 are set as the cooling gas. Input from the thermometer 8 and the pressure gauge 7 (step 5), and from the second radiation thermometer 11 to the inlet side 2a of the second cooling zone 2.
The radiation temperature of the steel plate temperature T i located at is input as a sample value (step 6), and the steel plate temperature T O at the currently measured outlet side 2b of the second cooling zone 2 of the steel plate 3 is estimated (step 7). ..
【００２６】次に、各冷却帯１，２の入側１ａ，２ａで
温度を計測した鋼板３がそれぞれ各冷却帯１，２の出側
１ｂ，２ｂを通過するときに、第２及び第３の放射温度
１１，１２によって各鋼板３の計測位置の鋼板温度ＴS
を計測する（ステップ８）。次に、各冷却帯１，２の出
側１ｂ，２ｂでの上記推定した推定温度Ｔo と、実際に
計測した計測温度ＴS とを突き合わせ、その差が所定の
許容差ε、例えば１０℃内かどうか判定する。Next, when the steel plate 3 whose temperature is measured at the inlet sides 1a and 2a of the cooling zones 1 and 2 passes through the outlet sides 1b and 2b of the cooling zones 1 and 2, respectively, second and third Steel plate temperature T S at the measurement position of each steel plate 3 according to the radiation temperatures 11 and 12 of
Is measured (step 8). Next, the estimated temperature T o estimated at the outlet sides 1b and 2b of the cooling zones 1 and 2 and the measured temperature T S actually measured are compared, and the difference is a predetermined tolerance ε, for example, 10 ° C. Determine if it is within.
【００２７】そして、第１冷却帯１の出側１ｂでの推定
温度Ｔo と計測温度ＴS との差が許容差ε内で、且つ、
第２冷却帯２の出側２ｂでの推定温度Ｔo と計測温度Ｔ
S との差が許容差ε内と判断されると（ステップ９，１
１）、３つの放射温度計１０とも正常であることが検知
される（ステップ１２）。また、第１冷却帯１の出側１
ｂでの推定温度Ｔo と計測温度ＴS との差が許容差εよ
り大きく、且つ、第２冷却帯２の出側２ｂでの推定温度
Ｔo と計測温度Ｔ S との差が許容差ε内と判断されると
（ステップ９，１０）、第１冷却帯１の入側１ａの放射
温度計１０の指示値が異常であることが検知される（ス
テップ１３）。Then, the estimation at the outlet side 1b of the first cooling zone 1
Temperature ToAnd measured temperature TSWithin the tolerance ε, and
Estimated temperature T on the outlet side 2b of the second cooling zone 2oAnd measured temperature T
SIf it is judged that the difference between and is within the tolerance ε (steps 9, 1
1) Detected that all three radiation thermometers 10 are normal
(Step 12). In addition, the outlet side 1 of the first cooling zone 1
Estimated temperature T at boAnd measured temperature TSIs the tolerance ε
And the estimated temperature at the outlet side 2b of the second cooling zone 2
ToAnd measured temperature T SIf it is judged that the difference between
(Steps 9 and 10), radiation of the inlet side 1a of the first cooling zone 1
It is detected that the indicated value of the thermometer 10 is abnormal (
Step 13).
【００２８】また、第１冷却帯１の出側１ｂでの推定温
度Ｔo と計測温度ＴS との差が許容差ε内と判断され、
且つ、第２冷却帯２の出側２ｂでの推定温度Ｔo と計測
温度ＴS との差が許容差εより大きいと判断されると
（ステップ９，１１）、第２冷却帯２の出側２ｂの放射
温度計１２の指示値が異常であることが検知される（ス
テップ１４）。Further, the difference between the estimated temperature T o and the measured temperature T S at the first exit side 1b cooling zone 1 is determined within the tolerance epsilon,
And the difference between the estimated temperature T o and the measured temperature T S at the second exit side 2b cooling zone 2 is determined to be larger than the tolerance epsilon (Step 9, 11), out of the second cooling zone 2 It is detected that the indicated value of the radiation thermometer 12 on the side 2b is abnormal (step 14).
【００２９】また、第１冷却帯１の出側１ｂでの推定温
度Ｔo と計測温度ＴS との差が許容差εより大きく、且
つ、第２冷却帯２の出側２ｂでの推定温度Ｔo と計測温
度Ｔ S との差が許容差εより大きいと判断されると（ス
テップ９，１０）、２つ以上の放射温度計の指示値が異
常か、若しくは第１冷却帯１の出側１ｂ（第２冷却帯２
の入側２ａ）の放射温度計１１の指示値が異常と検知さ
れる。但し、２つ以上の放射温度計が一度に異常となる
ことはまれなので、この場合には、第１冷却帯１の出側
１ｂ（第２冷却帯２の入側２ａ）の放射温度計１１の指
示値が異常となっていると判断することができる。The estimated temperature at the outlet side 1b of the first cooling zone 1
Degree ToAnd measured temperature TSIs larger than the tolerance ε, and
Estimated temperature T on the outlet side 2b of the second cooling zone 2oAnd measured temperature
Degree T SIf it is judged that the difference between
(Steps 9, 10) Two or more radiation thermometers have different readings.
Always, or the outlet side 1b of the first cooling zone 1 (second cooling zone 2
The input value of the radiation thermometer 11 on the entry side 2a) of the
Be done. However, two or more radiation thermometers become abnormal at once
Since this is rare, in this case, the exit side of the first cooling zone 1
Finger of radiation thermometer 11 on 1b (entrance side 2a of second cooling zone 2)
It can be judged that the reading is abnormal.
【００３０】これによって、３つの放射温度計１０，１
１，１２のうちの特定の一つの指示値異常が検出される
と、その信号を警報出力装置１６に送り、その警報出力
装置１６がどの放射温度計が異常か警報を表示する。な
お、本実施例において、推定温度Ｔo と計測温度ＴS と
の許容差εを１０℃と設定したのは、実際に推定温度Ｔ
o と実際の計測温度ＴS を実験によって求めてみると、
図３に示すように、計測温度ＴS と推定温度Ｔo との精
度が±１０℃に収まっていることが判明したので上記値
に設定したと共に、上記（４）式による推定が所定許容
差の誤差で推定することができることを確認している。As a result, the three radiation thermometers 10, 1
When a specific one of the indicated values 1 and 12 is detected to be abnormal, the signal is sent to the alarm output device 16, and the alarm output device 16 displays an alarm indicating which radiation thermometer is abnormal. In the present embodiment, the tolerance ε between the estimated temperature T o and the measured temperature T S is set to 10 ° C. because the estimated temperature T
When o and the actual measured temperature T S are obtained by an experiment,
As shown in FIG. 3, it was found that the accuracy between the measured temperature T S and the estimated temperature T o was within ± 10 ° C. Therefore, the value was set to the above value, and the estimation by the equation (4) was performed with the predetermined tolerance. It is confirmed that the error can be estimated.
【００３１】[0031]
【発明の効果】以上説明してきたように、本発明の連続
焼鈍炉における放射温度計の指示値異常検出方法では、
各冷却帯における入側の鋼板温度の計測温度から出側の
鋼板温度が所定の精度で推定可能なことを利用すること
で、別の計測手段を設置することなく各冷却帯の入側及
び出側に設置された放射温度計を同時に監視して、操業
に影響を与えることなく、その放射温度計の指示値の異
常を早期に発見することができるという効果がある。As described above, according to the method for detecting an abnormality in the indicated value of the radiation thermometer in the continuous annealing furnace of the present invention,
By utilizing the fact that the steel plate temperature on the outlet side can be estimated with a predetermined accuracy from the measured temperature of the steel plate on the inlet side in each cooling zone, the inlet side and outlet side of each cooling zone can be installed without installing another measuring means. There is an effect that the radiation thermometer installed on the side can be monitored at the same time and an abnormality in the indicated value of the radiation thermometer can be detected early without affecting the operation.
【００３２】特に、連続する２つ以上の冷却帯に関して
上記処理をすると、特定した放射温度計の指示値に対し
て異常の有無が検出できるという効果がある。In particular, if the above process is performed for two or more continuous cooling zones, it is possible to detect whether or not there is an abnormality in the specified value of the radiation thermometer.
【図１】本発明に係る実施例の連続焼鈍炉における放射
温度計の指示値異常を検出する装置の概略構成図であ
る。FIG. 1 is a schematic configuration diagram of an apparatus for detecting an abnormal indication value of a radiation thermometer in a continuous annealing furnace according to an embodiment of the present invention.
【図２】本発明に係る実施例の放射温度計の異常を検査
する流れ図である。FIG. 2 is a flow chart for inspecting an abnormality of the radiation thermometer according to the embodiment of the present invention.
【図３】本発明に係る実施例の冷却帯出側での鋼帯温度
の推定温度と計測温度との関係を示す図である。FIG. 3 is a diagram showing a relationship between an estimated temperature and a measured temperature of a steel strip temperature on an outlet side of a cooling strip according to an embodiment of the present invention.
１ 第１冷却帯 １ａ 入側 １ｂ 出側 ２ 第２冷却帯 ２ａ 入側 ２ｂ 出側 ３ 鋼板 ７ 圧力計 ８ 冷却ガス温度計 ９ 異常検出装置 １０，１１，１２ 放射温度計 1 1st cooling zone 1a Input side 1b Output side 2 2nd cooling zone 2a Input side 2b Output side 3 Steel plate 7 Pressure gauge 8 Cooling gas thermometer 9 Abnormality detector 10, 11, 12 Radiation thermometer
Claims (2)
続焼鈍炉における冷却帯の入側及び出側に設置された放
射温度計の指示値異常を検出する方法において、冷却帯
の入側に設置された放射温度計にて計測した鋼板の温度
から、その冷却帯の冷却能力、鋼板の性状、及びパスラ
インの速度をもとに、その冷却帯の出側での上記鋼板の
温度を推定して、その推定値と、出側に設置された放射
温度計で計測した上記鋼板の温度計測値とを突き合わせ
ることを特徴とする連続焼鈍炉における放射温度計の指
示値異常検出方法。1. A method for detecting an anomaly in the indicated value of a radiation thermometer installed on the inlet side and outlet side of a cooling zone in a continuous annealing furnace provided with a heating zone and a cooling zone subsequent thereto, wherein the inlet side of the cooling zone is detected. Estimate the temperature of the steel sheet at the exit side of the cooling zone from the temperature of the steel sheet measured by the installed radiation thermometer, based on the cooling capacity of the cooling zone, the properties of the steel sheet, and the speed of the pass line. Then, the estimated value and the temperature measurement value of the steel sheet measured by the radiation thermometer installed on the outlet side are compared with each other, and a method for detecting an abnormal indication value of the radiation thermometer in the continuous annealing furnace.
て、各冷却帯における，入側に設置された放射温度計で
計測した鋼板温度から算出した出側での鋼板温度の推定
値と出側に設置された放射温度計で計測した上記鋼板の
温度計測値とをそれぞれ突き合わせることで、特定の放
射温度計の指示値が異常かどうか判定することを特徴と
する請求項１記載の連続焼鈍炉における放射温度計異常
検出方法。2. For at least two continuous cooling zones, an estimated value of the steel sheet temperature on the outlet side and an outlet side calculated from the steel sheet temperature measured by a radiation thermometer installed on the inlet side in each cooling zone. The continuous annealing according to claim 1, wherein it is determined whether or not the indicated value of the specific radiation thermometer is abnormal by comparing the measured values of the temperature of the steel sheet measured by the radiation thermometer installed in the. Detection method of radiation thermometer in furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4153690A JPH05345929A (en) | 1992-06-12 | 1992-06-12 | Detection of abnormality of value registered by radiation thermometer for continuous annealing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4153690A JPH05345929A (en) | 1992-06-12 | 1992-06-12 | Detection of abnormality of value registered by radiation thermometer for continuous annealing furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05345929A true JPH05345929A (en) | 1993-12-27 |
Family
ID=15568012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4153690A Pending JPH05345929A (en) | 1992-06-12 | 1992-06-12 | Detection of abnormality of value registered by radiation thermometer for continuous annealing furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05345929A (en) |
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| JP2007248178A (en) * | 2006-03-15 | 2007-09-27 | Jfe Steel Kk | Detection method and detector of abnormal indicated value in radiation thermometer |
| JP2008175761A (en) * | 2007-01-22 | 2008-07-31 | Jfe Steel Kk | Method for monitoring failure of radiation thermometer |
| JP2011191205A (en) * | 2010-03-15 | 2011-09-29 | Nippon Steel Corp | Method and device for integrity checking of radiation thermometer |
| JP2020063497A (en) * | 2018-10-19 | 2020-04-23 | Ｊｆｅスチール株式会社 | Method and apparatus for controlling temperature of metal strip |
| CN114944354A (en) * | 2022-07-21 | 2022-08-26 | 江苏邑文微电子科技有限公司 | Abnormity checking method and device for wafer annealing equipment |
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1992
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007248178A (en) * | 2006-03-15 | 2007-09-27 | Jfe Steel Kk | Detection method and detector of abnormal indicated value in radiation thermometer |
| JP2008175761A (en) * | 2007-01-22 | 2008-07-31 | Jfe Steel Kk | Method for monitoring failure of radiation thermometer |
| JP2011191205A (en) * | 2010-03-15 | 2011-09-29 | Nippon Steel Corp | Method and device for integrity checking of radiation thermometer |
| JP2020063497A (en) * | 2018-10-19 | 2020-04-23 | Ｊｆｅスチール株式会社 | Method and apparatus for controlling temperature of metal strip |
| CN114944354A (en) * | 2022-07-21 | 2022-08-26 | 江苏邑文微电子科技有限公司 | Abnormity checking method and device for wafer annealing equipment |
| CN114944354B (en) * | 2022-07-21 | 2022-09-27 | 江苏邑文微电子科技有限公司 | Abnormity checking method and device for wafer annealing equipment |
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