JP2005315510A - Heating furnace, thermometer, and in-furnace temperature control method - Google Patents
Heating furnace, thermometer, and in-furnace temperature control method Download PDFInfo
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- JP2005315510A JP2005315510A JP2004133905A JP2004133905A JP2005315510A JP 2005315510 A JP2005315510 A JP 2005315510A JP 2004133905 A JP2004133905 A JP 2004133905A JP 2004133905 A JP2004133905 A JP 2004133905A JP 2005315510 A JP2005315510 A JP 2005315510A
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- 238000010438 heat treatment Methods 0.000 title claims description 33
- 238000000034 method Methods 0.000 title claims description 4
- 230000001681 protective effect Effects 0.000 claims abstract description 57
- 238000002485 combustion reaction Methods 0.000 claims abstract description 45
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 27
- 229910052697 platinum Inorganic materials 0.000 claims description 13
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 2
- 238000002791 soaking Methods 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 description 8
- 238000000605 extraction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- BALRIWPTGHDDFF-UHFFFAOYSA-N rhodium Chemical compound [Rh].[Rh] BALRIWPTGHDDFF-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
本発明は、炉内材料の偏熱を抑制可能な加熱炉、及び、この加熱炉に設置される炉内温度制御用の温度計、並びに、前記加熱炉における炉内温度制御方法に関するものである。 The present invention relates to a heating furnace capable of suppressing the uneven heat of the in-furnace material, a thermometer for controlling the furnace temperature installed in the heating furnace, and a furnace temperature control method in the heating furnace. .
例えば、図５に示すウォーキングビーム式加熱炉３１では、装入側から予熱帯３２、加熱帯３３、均熱帯３４となされ、これら各帯３２〜３４で所定の温度に加熱された例えばビレット等の炉内材料（以下、「ビレット３５」と言う。）は順次出側から抽出される。従って、これら各帯３２〜３４における炉内温度制御は、ビレット温度の偏熱を抑制するために極めて重要である。特に抽出直前の均熱帯３４の炉内温度制御は需要である。そして、この炉内温度の制御に際し、炉内温度を測定する温度計は、最も重要なセンサーである。 For example, in the walking beam type heating furnace 31 shown in FIG. 5, a pre-tropical zone 32, a heating zone 33, and a soaking zone 34 are formed from the charging side, and each zone 32 to 34 is heated to a predetermined temperature, such as a billet. In-furnace material (hereinafter referred to as “billette 35”) is sequentially extracted from the outlet side. Therefore, in-furnace temperature control in each of the bands 32 to 34 is extremely important in order to suppress the uneven heat of the billet temperature. In particular, temperature control in the soaking zone 34 immediately before extraction is in demand. In controlling the furnace temperature, a thermometer that measures the furnace temperature is the most important sensor.
このビレットの温度を最適に制御するためには、ビレット近傍の温度を測定し、この測定値に基づいて炉内温度を制御することが望ましいが、炉内温度制御用の温度計（熱電対装置）は、価格・寿命・操作性の面から、一般に、炉壁に設置されている。 In order to optimally control the temperature of the billet, it is desirable to measure the temperature in the vicinity of the billet and control the temperature in the furnace based on the measured value. However, a thermometer (thermocouple device) for controlling the temperature in the furnace ) Is generally installed on the furnace wall in terms of price, life and operability.
例えば上部燃焼制御用の温度計３６ａは、図５（ａ）に示したように、天井壁に設置され、下部燃焼制御用の温度計３６ｂは、図５（ｂ）に示したように、側壁に取り付けられることが多い。なお、下部燃焼制御用の温度計を炉床に取り付けずに、側壁に取付けるのは、故障時に容易に取り替えられる場所に設置する必要があるためである。この下部燃焼制御用の温度計は、炉壁に設けられているため、実際の抽出帯におけるビレット下部周辺の温度とは、かなり異なる傾向がある。これは、抽出扉、排出ローラ、下部バーナ、スケールピット等が直近にあり、外乱の影響を受け易いためである。 For example, the upper combustion control thermometer 36a is installed on the ceiling wall as shown in FIG. 5A, and the lower combustion control thermometer 36b is installed on the side wall as shown in FIG. 5B. It is often attached to. The reason why the thermometer for lower combustion control is not attached to the hearth but attached to the side wall is that it is necessary to install it in a place where it can be easily replaced in the event of a failure. Since this lower combustion control thermometer is provided on the furnace wall, it tends to be quite different from the temperature around the lower part of the billet in the actual extraction zone. This is because the extraction door, the discharge roller, the lower burner, the scale pit and the like are close to each other and are easily affected by disturbance.
しかしながら、同じ炉壁であっても、天井壁と側壁と炉床では、かなり温度が異なる。通常は、熱損失が少なく、バーナフレームに近い炉床が最も温度が高く、続いて天井壁、側壁の順になる。特にウォーキングビーム式加熱炉のように、広くて大きな炉においては、実際に制御に使用している温度計周辺の雰囲気温度と、ビレット周辺の温度とは、かなり異なる場合が多い。これは、先に述べた外乱の影響とバーナの焚き量によってフレーム長さ、つまり火炎のピーク温度点が変わる事が主な原因である。 However, even with the same furnace wall, the temperature is considerably different between the ceiling wall, the side wall, and the hearth. Usually, the heat loss is low, and the hearth near the burner frame has the highest temperature, followed by the ceiling wall and side walls. In particular, in a large and large furnace such as a walking beam heating furnace, the ambient temperature around the thermometer actually used for control and the temperature around the billet are often quite different. This is mainly because the frame length, that is, the peak temperature point of the flame changes depending on the influence of the disturbance described above and the amount of burning of the burner.
また、ウォーキングビーム式連続加熱炉では、搬送ビームや固定ビームを冷却する冷却水によって、ビーム周辺（ビレット近傍）の雰囲気温度が天井壁や側壁の部分に比べてかなり低く、また、抽出ローラ付近は極端に温度が低くなっていることが、本発明者の調査によって判明した。 In the walking beam type continuous heating furnace, the ambient temperature around the beam (near the billet) is considerably lower than the ceiling and side walls due to the cooling water that cools the carrier beam and fixed beam. It has been found by the inventor's investigation that the temperature is extremely low.
よって、ビレット温度をより正確に知るためには、炉内温度制御用の温度計は、可及的にビレットの近傍に設置することが望ましいが、ウォーキングビーム式加熱炉では、炉内温度が１２００〜１３００℃と高いこと、また、天井壁や側壁から挿入した温度計でビレット近傍の炉内温度を測定するには、２ｍもの長尺の温度計を必要とする等から、温度計の構造や環境的にきわめて困難であり、天井壁や側壁から１００ｍｍ程度炉内側の位置の雰囲気温度を測定しているのが実情である。 Therefore, in order to know the billet temperature more accurately, it is desirable to install the thermometer for controlling the furnace temperature in the vicinity of the billet as much as possible. However, in the walking beam heating furnace, the furnace temperature is 1200. In order to measure the temperature inside the furnace near the billet with a thermometer inserted from the ceiling wall or side wall, a thermometer as long as 2 m is required. It is extremely difficult environmentally, and the actual situation is measuring the ambient temperature at a position inside the furnace of about 100 mm from the ceiling wall or side wall.
従って、図５に示したような位置に設置した従来の温度計による測定値を使用した炉内温度制御では、抽出が停滞した時等、状況が変化した場合、ビレットの上下方向で温度差がつき易く、圧延時における偏肉不良の原因となる。 Therefore, in the furnace temperature control using the measured value by the conventional thermometer installed at the position as shown in FIG. 5, when the situation changes, such as when the extraction is stagnant, there is a temperature difference in the vertical direction of the billet. It is easy to stick and causes uneven thickness failure during rolling.
ところで、温度計（熱電対装置）は、図６に示したように、熱接点３７と、この熱接点３７に接続される、例えば白金３８ａと白金ロジウム３８ｂの２本の熱電対素線３８を絶縁保持する絶縁管３９を備えた熱電対素子４０を、保護管４１の内部に収納した構成である。なお、前記絶縁管３９は軸方向に分割された構成である。
このような構成の温度計の不良は、保護管の不良と、熱電対素線の不良に分けることができる。このうち、保護管の不良は、炉内温度が昇降することによる機械的熱歪やバーナフレームや炉内雰囲気ガスによる劣化が主な原因である。一方、熱電対素線の不良は、その構成上絶縁管を保持しなければならないことから起こる自重による断線や、炉内温度が昇降することによる熱膨張収縮による断線、炉内雰囲気ガスによる材質変化による誤差等が主な原因である。 The failure of the thermometer having such a configuration can be divided into a failure of a protective tube and a failure of a thermocouple element. Among these, the failure of the protective tube is mainly due to mechanical thermal distortion due to the rise and fall of the furnace temperature and deterioration due to the burner frame and the atmosphere gas in the furnace. On the other hand, defective thermocouple wires are broken due to their own weight due to the fact that the insulation tube must be held due to their configuration, broken due to thermal expansion and contraction due to the rise and fall of the furnace temperature, and material change due to furnace atmosphere gas This is mainly due to errors caused by
また、熱電対素線そのものも、本発明者による調査の結果、熱応力により膨張・収縮を繰り返す毎に白金・白金ロジウムの白金側が白金ロジウム側に比べて伸びが激しく、捩じれて破断し易くなることが判明した。 In addition, as a result of the investigation by the present inventors, the thermocouple element itself is more likely to be twisted and broken easily because the platinum side of platinum / rhodium rhodium is stretched more intensely than the platinum rhodium side each time the expansion / contraction is repeated due to thermal stress. It has been found.
これは、白金が白金ロジウムに比べて柔らかくて重たいので、伸び易く引っ張り強さが弱いために切れ易いからである。また、図６（ｂ）に示したように、絶縁管３９の出口がＷ型となっていたり、図７に示したように、絶縁管３９の出口がフラットの従来の温度計では、この絶縁管３９の出口の角の部分で、前記膨張・収縮を繰り返す際に擦れることによっても断線が発生する。 This is because platinum is softer and heavier than platinum rhodium, and is easy to stretch because it is easy to stretch and has low tensile strength. In addition, as shown in FIG. 6B, the insulation tube 39 has a W-shaped outlet, or as shown in FIG. 7, the insulation tube 39 has a flat outlet. Disconnection is also caused by rubbing at the corner of the outlet of the tube 39 when the expansion / contraction is repeated.
本発明が解決しようとする問題点は、ビレット近傍の炉内温度を長時間安定して測定することができないという点、及び、多少バーナフレームの影響を受けても、熱応力等に耐えることができる温度計がないという点である。 The problems to be solved by the present invention are that the furnace temperature in the vicinity of the billet cannot be measured stably for a long time, and it can withstand thermal stress etc. even if it is somewhat affected by the burner frame. There is no thermometer that can be used.
本発明は上記の知見等に基づいてなされたもので、
本発明の加熱炉は、
可及的に炉内に位置するビレット近傍の温度測定を可能とするために、
炉の燃焼制御用熱電対式温度計のための保護管を有し、
前記保護管は炉の側壁に取り付ける基端側保護管と、前記炉内に位置させる先端側保護管に分割して、該先端側保護管は前記基端側保護管に対して軸方向のスライドが自在なように嵌め合わされると共に、
前記先端側保護管の先端部は、炉内の固定ビームの軸と直角方向にスライドが自在なように前記固定ビームの下部を貫通させ、
前記温度計の計測部である熱接点を固定ビームの近傍に位置させたこと、
又は／及び、
炉内の天井に設置する上部燃焼制御用熱電対式温度計のための保護管と絶縁管、及び該絶縁管と該絶縁管を固定するための端子板を有し、
前記端子板は、前記炉内の天井壁に固定され、
前記保護管は、水平方向及び上下方向の移動が自在なように前記端子板に取付けられたことを最も主要な特徴としている。
The present invention has been made on the basis of the above findings, etc.
The heating furnace of the present invention is
In order to enable temperature measurement near the billet located in the furnace as much as possible,
Has a protective tube for thermocouple thermometer for furnace combustion control,
The protective tube is divided into a proximal-side protective tube attached to the side wall of the furnace and a distal-side protective tube positioned in the furnace, and the distal-side protective tube slides in the axial direction with respect to the proximal-side protective tube. Are fitted together so that
The distal end portion of the distal end side protective tube penetrates the lower part of the fixed beam so that it can slide in a direction perpendicular to the axis of the fixed beam in the furnace,
The thermal contact that is the measurement part of the thermometer is located in the vicinity of the fixed beam,
Or / and
A protective tube and an insulating tube for an upper combustion control thermocouple thermometer installed on the ceiling in the furnace, and a terminal plate for fixing the insulating tube and the insulating tube;
The terminal plate is fixed to a ceiling wall in the furnace,
The main feature of the protective tube is that it is attached to the terminal plate so as to be movable in the horizontal and vertical directions.
この本発明の加熱炉において、少なくとも炉に設置する温度計を前記の構成とするのは、炉内でビレットが所定の温度になっていないと、その後の圧延で偏肉が発生することと、先に説明したように、炉内の特に抽出ローラ付近は温度が低くなっており、より正確にビレット近傍の雰囲気温度を測定する必要があるからである。 In the heating furnace of the present invention, at least the thermometer installed in the furnace has the above-described configuration.If the billet is not at a predetermined temperature in the furnace, uneven thickness occurs in subsequent rolling, As described above, the temperature in the furnace is particularly low near the extraction roller, and it is necessary to measure the ambient temperature near the billet more accurately.
また、前記本発明の加熱炉に設置する本発明の燃焼制御用熱電対式温度計は、
バーナフレーム等による影響を排除して寿命延長を可能とするために、
下部燃焼制御用熱電対式温度計では、
前記保護管と前記熱電対式温度計を構成する熱電対素子を有し、
前記保護管は、前記基端側保護管と、前記先端側保護管とで構成され、
前記熱電対素子は、前記基端側保護管の炉外側から挿入され、前記先端側保護管の先端に至るように取り付けられたことを、
また、
上部燃焼制御用熱電対式温度計では、
前記保護管と前記絶縁管と前記熱電対素子を有し、
前記絶縁管は、前記保護管に対して、水平方向及び上下方向の移動が自在なように取り付けられ、
前記熱電対素子は、前記絶縁管内に絶縁保持されたことを最も主要な特徴としている。
Further, the thermocouple thermometer for combustion control of the present invention installed in the heating furnace of the present invention,
In order to eliminate the influence of the burner frame etc. and to extend the life,
In the thermocouple thermometer for lower combustion control,
A thermocouple element constituting the protective tube and the thermocouple thermometer;
The protective tube is composed of the proximal protective tube and the distal protective tube,
The thermocouple element was inserted from the outside of the furnace of the proximal end side protection tube, and was attached so as to reach the distal end of the distal end side protection tube.
Also,
In the thermocouple thermometer for upper combustion control,
The protective tube, the insulating tube, and the thermocouple element;
The insulating tube is attached to the protective tube so as to be movable in the horizontal and vertical directions,
The most important feature of the thermocouple element is that it is insulated and held in the insulating tube.
前記本発明の加熱炉に設置する燃焼制御用熱電対式温度計においては、
２本の熱電対素線と前記絶縁管を有し、
前記絶縁管は、その先端を楔状に形成して、この楔状面に前記２本の熱電対素線の出口を設け、
前記熱電対素線は白金ロジウムと白金の２つの部分で構成され、
前記白金ロジウム部分は前記白金部分よりも長く、前記２本の熱電対素線の接点位置を前記白金側寄りに位置させることが、絶縁管の出口での接触に起因する熱電対素線の断線を防止する点からは望ましい。また、前記下部燃焼制御用熱電対式温度計の前記先端側保護管や、前記上部燃焼制御用熱電対式温度計の前記保護管は再結晶アルミナ製であることが、長寿命化の点で望ましい。
In the thermocouple thermometer for combustion control installed in the heating furnace of the present invention,
Having two thermocouple wires and the insulating tube,
The insulating tube has a wedge-shaped tip, and an outlet of the two thermocouple wires is provided on the wedge-shaped surface,
The thermocouple wire is composed of two parts, platinum rhodium and platinum,
The platinum rhodium part is longer than the platinum part, and the contact position of the two thermocouple wires is located closer to the platinum side, the disconnection of the thermocouple wire due to the contact at the outlet of the insulating tube It is desirable from the point of preventing. In addition, from the viewpoint of extending the life, the protective tube on the tip side of the thermocouple thermometer for lower combustion control and the protective tube of the thermocouple thermometer for upper combustion control are made of recrystallized alumina. desirable.
また、燃焼制御用熱電対式温度計において、前記先端側保護管は一体的に形成されたものであることが、雰囲気ガスの侵入防止の点からは望ましい。 Further, in the thermocouple thermometer for combustion control, it is desirable from the viewpoint of preventing the intrusion of the atmospheric gas that the tip side protective tube is formed integrally.
前記の本発明の下部燃焼制御用熱電対式温度計を用いて測定した少なくとも炉の下部温度と、前記の本発明の上部燃焼制御用熱電対式温度計を用いて測定した少なくとも炉の上部温度を用いて、炉の炉内温度制御を行う本発明の加熱炉の炉内温度制御方法によれば、可及的にビレット近傍の炉内雰囲気温度が測定できるので、近傍の急激な温度変化にも即反応し、抽出時のビレット周辺温度を均一に制御でき、偏熱発生が抑制できる。 At least the lower temperature of the furnace measured using the thermocouple thermometer for lower combustion control of the present invention, and at least the upper temperature of the furnace measured using the thermocouple thermometer for upper combustion control of the present invention. According to the furnace temperature control method of the heating furnace of the present invention that controls the furnace temperature of the furnace using the can, the furnace atmosphere temperature near the billet can be measured as much as possible. Can react immediately, can uniformly control the billet ambient temperature during extraction, and can suppress the occurrence of uneven heat.
本発明では、温度計の長寿命化を図りつつ、可及的にビレット近傍の炉内温度を測定することができるので、偏熱発生を抑制することができるという利点がある。また、本発明の下部燃焼制御用温度計では、先端側保護管を軸方向のスライドが自在なように保持しているので、バーナフレーム等による影響を受けることがない。 In the present invention, since the temperature in the furnace near the billet can be measured as much as possible while extending the life of the thermometer, there is an advantage that the occurrence of uneven heat can be suppressed. Further, in the lower combustion control thermometer of the present invention, the tip side protection tube is held so as to be freely slidable in the axial direction, so that it is not affected by the burner frame or the like.
以下、本発明を実施するための最良の形態について、図１〜図４を用いて説明する。
図１はウォーキングビーム式加熱炉に適用した場合の本発明の加熱炉における下部燃焼制御用熱電対式温度計の説明図で、均熱帯の側壁下部に設置した場合を説明する図である。この図１中の１は固定ビーム、２は搬送ビームである。
Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS.
FIG. 1 is an explanatory diagram of a thermocouple thermometer for lower combustion control in a heating furnace of the present invention when applied to a walking beam type heating furnace, and is a diagram for explaining a case where it is installed at the lower part of a side wall in a soaking zone. In FIG. 1, 1 is a fixed beam and 2 is a carrier beam.
３は下部燃焼制御用熱電対式温度計であり、その保護管４を、均熱帯の側壁５に固定する基端側保護管４ａと、均熱帯内に位置する先端側保護管４ｂに２分割している。そして、これら２分割した基端側保護管４ａと先端側保護管４ｂは、例えば共に再結晶アルミナで製作され、このうち、基端側保護管４ａは、例えばステンレス鋼製のケース６内に耐熱セメント７を介在させて保持され、このケース６を挿入した側壁５の炉内側は、断熱材８で蓋をされている。 Reference numeral 3 denotes a thermocouple type thermometer for controlling the lower combustion, and the protective tube 4 is divided into two, a base end side protective tube 4a fixed to the soaking zone side wall 5 and a tip end side protecting tube 4b located in the soaking zone. doing. The base end side protection tube 4a and the front end side protection tube 4b divided into two parts are both made of, for example, recrystallized alumina. Among these, the base end side protection tube 4a is heat resistant in a case 6 made of, for example, stainless steel. The inside of the furnace of the side wall 5 in which the case 6 is inserted is covered with a heat insulating material 8 and held with the cement 7 interposed.
加えて、本発明では、先端側保護管４ｂの基端部を基端側保護管４ａに対して軸方向のスライドが自在なように外嵌状に嵌め合わせている。一方、先端側保護管４ｂの先端部は、固定ビーム１の軸と直角方向に、その下部に固定ビーム１に対してスライドが自在なように貫通させている。 In addition, in the present invention, the proximal end portion of the distal end side protective tube 4b is fitted in an outer fitting shape so as to be slidable in the axial direction with respect to the proximal end side protective tube 4a. On the other hand, the distal end portion of the distal end side protection tube 4b is penetrated in a direction perpendicular to the axis of the fixed beam 1 so that the lower end thereof can slide with respect to the fixed beam 1.
前記構成を採用することで、前記基端側保護管４ａの基端側から挿入される熱電対素子９は、その計測部である熱接点を固定ビーム１の近傍に位置させることができ、この固定ビーム１や搬送ビーム２上を移動するビレット２５の裏面側近傍の炉内雰囲気温度を精度良く測定できるようになる。 By adopting the above configuration, the thermocouple element 9 inserted from the base end side of the base end side protective tube 4a can place the thermal contact as a measuring part in the vicinity of the fixed beam 1, It becomes possible to accurately measure the furnace atmosphere temperature in the vicinity of the back side of the billet 25 moving on the fixed beam 1 and the carrier beam 2.
また、炉内温度の昇降によって保護管４が膨張・収縮しても、先端側保護管４ｂは固定されておらず、スライドが自在であるので、不良が発生することもない。なお、図１中の９ａは熱電対素子９を構成する絶縁管であり、この絶縁管９ａ内で２本の熱電対素子が絶縁保持されていることは、従来の温度計と同様である。この絶縁管９ａは軸方向に分割せず、一体的に形成したものを使用することが望ましい。 Further, even if the protective tube 4 expands and contracts due to the rise and fall of the furnace temperature, the distal end side protective tube 4b is not fixed and can be slid freely, so that no defect occurs. In addition, 9a in FIG. 1 is the insulation tube which comprises the thermocouple element 9, and it is the same as that of the conventional thermometer that the two thermocouple elements are insulated and hold | maintained in this insulation tube 9a. The insulating tube 9a is preferably not integrally divided but formed integrally.
図２はウォーキングビーム式加熱炉に適用した場合の本発明の加熱炉における上部燃焼制御用熱電対式温度計の説明図で、均熱帯の天井壁に設置した場合を説明する図、図３は上部燃焼制御用熱電対式温度計の詳細を断面して示した図である。 FIG. 2 is an explanatory diagram of a thermocouple thermometer for upper combustion control in the heating furnace of the present invention when applied to a walking beam type heating furnace. FIG. It is the figure which carried out the cross section and showed the detail of the thermocouple thermometer for upper combustion control.
１１は上部燃焼制御用熱電対式温度計であり、図３に示すように、熱電対素子１２を構成する絶縁管１２ａをその軸方向に分割せず一体的に形成し、この一体的に形成した絶縁管１２ａを、その上端部で端子板１３に固定している。このようにすることで、絶縁管１２ａを熱電対素線１２ｂによって保持することが無くなり、自重による熱電対素線１２ｂの断線を防止できると共に、炉内雰囲気ガスの侵入も防止できる。 Reference numeral 11 denotes an upper combustion control thermocouple thermometer. As shown in FIG. 3, the insulating tube 12a constituting the thermocouple element 12 is integrally formed without being divided in the axial direction, and is integrally formed. The insulated tube 12a is fixed to the terminal plate 13 at its upper end. By doing so, the insulating tube 12a is not held by the thermocouple element 12b, and disconnection of the thermocouple element 12b due to its own weight can be prevented and intrusion of furnace atmosphere gas can also be prevented.
そして、前記端子板１３を、前記天井壁１４に例えばフランジ１５によって固定する再結晶アルミナ製の保護管１６に対して、水平方向及び上下方向の移動が自在なように取付けている。保護管１６に対して端子板１３を水平方向及び上下方向の移動が自在なように取付ける手段は、特に限定されないが、図３に示した例では次のような構成のものを示している。 The terminal board 13 is attached to a recrystallized alumina protective tube 16 fixed to the ceiling wall 14 by, for example, a flange 15 so as to be movable in the horizontal direction and the vertical direction. The means for attaching the terminal plate 13 to the protective tube 16 so as to be freely movable in the horizontal direction and the vertical direction is not particularly limited, but the example shown in FIG.
すなわち、保護管１６を外側保護管１６ａと内側保護管１６ｂの２重に構成し、このうちの外側保護管１６ａの外側に更に耐熱セメント１７によって接着した例えばステンレス製のケース１８内に保持板１９を固定する。なお、ステンレスの部分は、耐熱温度の関係より、炉内に入らないような長さにする。 That is, the protective tube 16 is constituted by a double of an outer protective tube 16a and an inner protective tube 16b, and the holding plate 19 is placed in a case 18 made of stainless steel, for example, which is further bonded to the outside of the outer protective tube 16a by a heat-resistant cement 17. To fix. In addition, the length of the stainless steel portion is set so as not to enter the furnace because of the heat resistant temperature.
前記保持板１９に突出状に取り付けたねじ軸２０より大径の孔２１ａを有する座２１を、前記ねじ軸２０を貫通して前記保持板１９の上に載せ、この座２１の軸心に設けた軸孔２１ｂに前記端子板１３嵌め込む。このようにすることで、保護管１６に対して端子板１３が水平方向及び上下方向に自在に移動することができる。 A seat 21 having a hole 21 a having a diameter larger than that of the screw shaft 20 attached to the holding plate 19 so as to protrude is placed on the holding plate 19 through the screw shaft 20, and provided on the shaft center of the seat 21. The terminal plate 13 is fitted into the shaft hole 21b. By doing in this way, the terminal board 13 can move freely with respect to the protective tube 16 in a horizontal direction and an up-down direction.
図４は本発明の熱電対式温度計における絶縁管の先端部における形状及び熱接点の説明図である。
前記の下部燃焼制御用熱電対式温度計３や上部燃焼制御用熱電対式温度計１１では、その熱電対素子９，１２を構成する絶縁管９ａ，１２ａの先端を図４（ｃ）に示したように楔状に形成して、この楔状面９ａａ，１２ａａに２本の熱電対素線９ｂ，１２ｂの出口を設けると共に、図４（ａ）に示したように、常温時には、２本の熱電対素線９ｂ，１２ｂのうち、熱膨張率の小さい白金ロジウム９ｂｂ、１２ｂｂを、熱膨張率の大きい白金９ｂａ，１２ｂａよりも予め長くなして、熱接点２２の位置を白金９ｂａ，１２ｂａ側寄りに位置させておくことが望ましい。
FIG. 4 is an explanatory diagram of the shape and the hot junction at the tip of the insulating tube in the thermocouple thermometer of the present invention.
In the lower combustion control thermocouple thermometer 3 and the upper combustion control thermocouple thermometer 11, the tips of the insulating tubes 9a and 12a constituting the thermocouple elements 9 and 12 are shown in FIG. As shown in FIG. 4 (a), the two thermocouple wires 9b and 12aa are provided with outlets for the two thermocouple wires 9b and 12b. Of the paired wires 9b and 12b, platinum rhodium 9bb and 12bb having a small coefficient of thermal expansion is made longer than platinum 9ba and 12ba having a large coefficient of thermal expansion in advance, and the position of the thermal contact 22 is closer to the side of the platinum 9ba and 12ba. It is desirable to keep it in place.
このような構成とすれば、２本の熱電対素線９ｂ，１２ｂの膨張・収縮時に、絶縁管９ａ，１２ａの出口の角での接触が効果的に防止でき、熱電対素線９ｂ，１２ｂの断線を防ぐことができる。 With such a configuration, when the two thermocouple strands 9b and 12b expand and contract, contact at the corners of the outlets of the insulating tubes 9a and 12a can be effectively prevented, and the thermocouple strands 9b and 12b. Can be prevented.
前記の下部燃焼制御用熱電対式温度計３や上部燃焼制御用熱電対式温度計１１を均熱帯に設置した例えばウォーキングビーム式加熱炉では、ビレット近傍の炉内雰囲気温度を測定し、炉内温度の制御が最適に行えることになって、偏熱の発生が抑制できる。 For example, in the walking beam type heating furnace in which the lower combustion control thermocouple thermometer 3 and the upper combustion control thermocouple thermometer 11 are installed in the soaking zone, the atmosphere temperature in the furnace near the billet is measured, The temperature can be optimally controlled, and the occurrence of heat deviation can be suppressed.
上記の例は単なる一例であり、本発明は上記の例に限らず、各請求項に記載された技術的思想の範囲内で、適宜実施の形態を変更しても良いことは言うまでもない。 The above example is merely an example, and the present invention is not limited to the above example, and it goes without saying that the embodiment may be appropriately changed within the scope of the technical idea described in each claim.
以上の本発明は、加熱炉に限らず、保熱炉やあらゆる炉にも適用できる。また、ウォーキングビーム式炉以外の炉にも適用できる。 The present invention as described above can be applied not only to a heating furnace but also to a heat-retaining furnace or any furnace. It can also be applied to furnaces other than walking beam furnaces.
１ 固定ビーム
３ 下部燃焼制御用熱電対式温度計
４ 保護管
４ａ 基端側保護管
４ｂ 先端側保護管
５ 側壁
９ 熱電対素子
９ａ 絶縁管
９ａａ 楔状面
９ｂ 熱電対素線
９ｂａ 白金
９ｂｂ 白金ロジウム
１１ 上部燃焼制御用熱電対式温度計
１２ 熱電対素子
１２ａ 絶縁管
１２ａａ 楔状面
１２ｂ 熱電対素線
１２ｂａ 白金
１２ｂｂ 白金ロジウム
１３ 端子板
１４ 天井壁
１６ 保護管
DESCRIPTION OF SYMBOLS 1 Fixed beam 3 Thermocouple type thermometer for lower combustion control 4 Protection tube 4a Base end side protection tube 4b Front end side protection tube 5 Side wall 9 Thermocouple element 9a Insulation tube 9aa Wedge-shaped surface 9b Thermocouple element 9ba Platinum 9bb Platinum rhodium 11 Thermocouple type thermometer for upper combustion control 12 Thermocouple element 12a Insulating tube 12aa Wedge surface 12b Thermocouple element 12ba Platinum 12bb Platinum rhodium 13 Terminal plate 14 Ceiling wall 16 Protective tube
Claims (9)
前記保護管は炉の側壁に取り付ける基端側保護管と、前記炉内に位置させる先端側保護管に分割して、該先端側保護管は前記基端側保護管に対して軸方向のスライドが自在なように嵌め合わされると共に、
前記先端側保護管の先端部は、炉内の固定ビームの軸と直角方向にスライドが自在なように前記固定ビームの下部を貫通させ、
前記温度計の計測部である熱接点を固定ビームの近傍に位置させ、炉内を搬送する材料の裏面近傍の雰囲気温度を測定可能に構成したことを特徴とする加熱炉。 Has a protective tube for thermocouple thermometer for furnace combustion control,
The protective tube is divided into a proximal-side protective tube attached to the side wall of the furnace and a distal-side protective tube positioned in the furnace, and the distal-side protective tube slides in the axial direction with respect to the proximal-side protective tube. Are fitted together so that
The distal end portion of the distal end side protective tube penetrates the lower part of the fixed beam so that it can slide in a direction perpendicular to the axis of the fixed beam in the furnace,
A heating furnace characterized in that a thermal contact, which is a measuring part of the thermometer, is positioned in the vicinity of a fixed beam so that the ambient temperature in the vicinity of the back surface of the material conveyed in the furnace can be measured.
前記端子板は、前記炉内の天井壁に固定され、
前記保護管は、水平方向及び上下方向の移動が自在なように前記端子板に取付けられ、炉内を搬送する材料の表面近傍の雰囲気温度を測定可能に構成したことを特徴とする加熱炉。 A protective tube and an insulating tube for an upper combustion control thermocouple thermometer installed on the ceiling in the furnace, and a terminal plate for fixing the insulating tube and the insulating tube;
The terminal plate is fixed to a ceiling wall in the furnace,
A heating furnace characterized in that the protective tube is attached to the terminal plate so as to be movable in the horizontal direction and the vertical direction, and is capable of measuring the ambient temperature in the vicinity of the surface of the material transported in the furnace.
前記保護管は、前記基端側保護管と、前記先端側保護管とで構成され、
前記熱電対素子は、前記基端側保護管の炉外側から挿入され、前記先端側保護管の先端に至るように取り付けられたことを特徴とする請求項１又は３に記載の加熱炉に設置する下部燃焼制御用熱電対式温度計。 A thermocouple element constituting the protective tube and the thermocouple thermometer;
The protective tube is composed of the proximal protective tube and the distal protective tube,
The said thermocouple element is inserted from the furnace outer side of the said base end side protection tube, and was attached so that it might reach the front-end | tip of the said front end side protection tube, The installation in the heating furnace of Claim 1 or 3 characterized by the above-mentioned. Thermocouple thermometer for lower combustion control.
前記絶縁管は、前記保護管に対して、水平方向及び上下方向の移動が自在なように取り付けられ、
前記熱電対素子は、前記絶縁管内に絶縁保持されたことを特徴とする請求項２又は３に記載の加熱炉に設置する上部燃焼制御用熱電対式温度計。 The protective tube, the insulating tube, and the thermocouple element;
The insulating tube is attached to the protective tube so as to be movable in the horizontal and vertical directions,
The thermocouple thermometer for upper combustion control installed in a heating furnace according to claim 2 or 3, wherein the thermocouple element is insulated and held in the insulating tube.
前記絶縁管は、その先端を楔状に形成して、この楔状面に前記２本の熱電対素線の出口を設け、
前記熱電対素線は白金ロジウムと白金の２つの部分で構成され、
前記白金ロジウム部分は前記白金部分よりも長く、前記２本の熱電対素線の接点位置を前記白金側寄りに位置させたことを特徴とする請求項４又は５に記載の加熱炉に設置する燃焼制御用熱電対式温度計。 Having two thermocouple wires and the insulating tube,
The insulating tube has a wedge-shaped tip, and the two thermocouple wires are provided on the wedge-shaped surface.
The thermocouple wire is composed of two parts, platinum rhodium and platinum,
The platinum rhodium portion is longer than the platinum portion, and the contact position of the two thermocouple strands is located closer to the platinum side, and is installed in the heating furnace according to claim 4 or 5. Thermocouple thermometer for combustion control.
3. At least the lower temperature of the furnace measured using the thermocouple thermometer for lower combustion control according to claim 1, and at least the upper temperature of the furnace measured using the thermocouple thermometer for upper combustion control according to claim 2. The furnace temperature control method for a heating furnace according to claim 3, wherein the furnace temperature control is performed using
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Cited By (7)
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| KR100849597B1 (en) | 2006-10-09 | 2008-07-31 | 주식회사 포스코 | Apparatus for measuring realtime temperature of continuous in Steel Manufacture Ladle |
| JP2009085762A (en) * | 2007-09-28 | 2009-04-23 | Toray Eng Co Ltd | Temperature measuring device |
| KR101204828B1 (en) * | 2009-10-29 | 2012-11-26 | 현대제철 주식회사 | Furnace |
| WO2013072983A1 (en) * | 2011-11-14 | 2013-05-23 | 株式会社 岡崎製作所 | Sheathed thermocouple terminal head |
| KR101320558B1 (en) * | 2006-12-19 | 2013-10-25 | 재단법인 포항산업과학연구원 | Apparatus for Sensing Temperature of Reheating Furnace |
| KR101356837B1 (en) | 2011-12-06 | 2014-01-28 | 주식회사 포스코 | Continuous Annealing Furnace |
| WO2023219420A1 (en) * | 2022-05-10 | 2023-11-16 | 주식회사 엘지화학 | Rotary kiln |
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| KR100849597B1 (en) | 2006-10-09 | 2008-07-31 | 주식회사 포스코 | Apparatus for measuring realtime temperature of continuous in Steel Manufacture Ladle |
| KR101320558B1 (en) * | 2006-12-19 | 2013-10-25 | 재단법인 포항산업과학연구원 | Apparatus for Sensing Temperature of Reheating Furnace |
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