JP4583256B2 - Heat treatment furnace - Google Patents
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- JP4583256B2 JP4583256B2 JP2005184110A JP2005184110A JP4583256B2 JP 4583256 B2 JP4583256 B2 JP 4583256B2 JP 2005184110 A JP2005184110 A JP 2005184110A JP 2005184110 A JP2005184110 A JP 2005184110A JP 4583256 B2 JP4583256 B2 JP 4583256B2
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Description
本発明は厚鋼板、形鋼等の長尺の被処理材を処理する熱処理炉に関する。 The present invention relates to a heat treatment furnace for processing a long material to be processed such as a thick steel plate or a shape steel.
長尺の被処理材を熱処理する熱処理炉として特許文献１や非特許文献１に記載の台車炉が公知である。これらの台車炉は、被処理材を積載する台車と加熱するための加熱手段（バーナ）、炉内に充満する雰囲気ガスを循環させる循環手段（循環ファン）を備えている。
特に特許文献１では、被処理材の長手方向に隔壁を形成し該隔壁には循環孔や排気孔を対称な位置に設けて、熱処理室にバーナからの燃焼ガスを噴射する筐体を左右交互に配置することで、局部的な高温部を抑えて長さ方向の温度分布を均一とする技術が開示されている。
In particular, in Patent Document 1, partition walls are formed in the longitudinal direction of a material to be processed, and circulation holes and exhaust holes are provided at symmetrical positions in the partition walls, and a casing for injecting combustion gas from a burner into a heat treatment chamber is alternately left and right. A technique is disclosed in which the temperature distribution in the length direction is made uniform by suppressing the local high-temperature portion by arranging in the above.
しかしながら、特許文献１の技術を用いて被処理材の加熱を行った場合、加熱ゾーン間に仕切りがないため、各加熱ゾーンの燃焼ガスが熱処理炉内で混合してしまい、そのため、熱処理炉の長さ方向の温度分布を目的のものとすることが困難となり、被処理材の長手方向の昇温状況を略均一にできないという問題があった。
また、被処理材を覆う筐体を設けて当該被処理材に直接燃焼ガスが当たることを防ぐ構造となっているものの、被処理材に温度上昇を測るための温度計がどの位置に配置されているか明確な開示がなく、被処理材の局部的な過加熱を完全に抑止できるものとはなっていない。
However, when the material to be processed is heated using the technique of Patent Document 1, since there is no partition between the heating zones, the combustion gas in each heating zone is mixed in the heat treatment furnace. There is a problem that it is difficult to make the temperature distribution in the longitudinal direction the target, and the temperature rise state in the longitudinal direction of the material to be treated cannot be made substantially uniform.
In addition, although it has a structure that prevents the combustion gas from directly hitting the material to be processed by providing a housing that covers the material to be processed, the thermometer for measuring the temperature rise on the material to be processed is located at any position. There is no clear disclosure, and local overheating of the material to be treated cannot be completely suppressed.
加えて、加熱手段を被処理材に対して左右交互に配置することで、当該被処理材の幅方向の温度分布均一化を狙っているが、現実として、加熱手段からの燃焼ガスの上流側に位置する被処理材の昇温が早く、下流側が遅くなるという問題があって、被処理材の幅方向の昇温状況を略均一とすることができなかった。
そこで、本発明は、上記問題を鑑み、被処理材の長手方向及び幅方向に略均一に昇温できるような熱処理炉を提供することを目的とする。
In addition, by arranging the heating means alternately left and right with respect to the material to be treated, the temperature distribution in the width direction of the material to be treated is aimed to be uniform, but in reality, the upstream side of the combustion gas from the heating means There is a problem in that the temperature of the material to be processed positioned quickly is increased and the downstream side is delayed, and the temperature increasing condition in the width direction of the material to be processed cannot be made substantially uniform.
In view of the above problems, an object of the present invention is to provide a heat treatment furnace that can raise the temperature substantially uniformly in the longitudinal direction and the width direction of a material to be processed.
前記目的を達成するため、本発明においては以下の技術的手段を講じた。
すなわち、本発明にかかる熱処理炉は、雰囲気ガスで長尺の被処理材を加熱する熱処理室と、該熱処理室に連通し且つ前記雰囲気ガスを加熱する加熱室とが備えられ、前記熱処理室は、被処理材の長さ方向に設けられた複数の仕切りにより複数の制御ゾーンに区画され、該熱処理室の制御ゾーン毎に、前記雰囲気ガスを当該熱処理室と加熱室との間で循環させ且つその送風方向が正逆切り換え自在である循環手段と、前記被処理材に対して上流側での雰囲気ガスの温度を測定する温度測定手段とが備えられ、前記加熱室は、熱処理室の制御ゾーンに対応し且つ連通する制御ゾーンに区画され、該加熱室の制御ゾーン毎に雰囲気ガスを加熱する加熱手段が設けられていることを特徴とする。
In order to achieve the above object, the present invention takes the following technical means.
That is, a heat treatment furnace according to the present invention includes a heat treatment chamber that heats a long object to be treated with an atmospheric gas, and a heating chamber that communicates with the heat treatment chamber and heats the atmospheric gas. , Partitioned into a plurality of control zones by a plurality of partitions provided in the length direction of the material to be treated, and for each control zone of the heat treatment chamber, the atmosphere gas is circulated between the heat treatment chamber and the heating chamber, and Circulating means whose air blowing direction can be switched between forward and reverse, and temperature measuring means for measuring the temperature of the atmospheric gas upstream of the material to be treated are provided, and the heating chamber is a control zone of the heat treatment chamber And a heating means for heating the atmosphere gas is provided for each control zone of the heating chamber.
熱処理室が、被処理材の長手方向に区画されて制御ゾーンとなっているため、各制御ゾーンの高温雰囲気ガスが熱処理炉内で混合することを防止することができ、熱処理炉の長さ方向の温度分布を所定のものとすることができる。
また、循環手段により、制御ゾーン毎、雰囲気ガスを風向が正逆切り換え自在に循環させることができるようになるため、被処理材の幅方向の温度分布を均一化でき、均一な昇温を実現できる。
Since the heat treatment chamber is divided into the longitudinal direction of the material to be treated and serves as a control zone, it is possible to prevent the high-temperature atmosphere gas in each control zone from mixing in the heat treatment furnace, and the length direction of the heat treatment furnace The temperature distribution can be a predetermined one.
In addition, the circulation means can circulate the atmosphere gas in each control zone so that the wind direction can be switched between forward and reverse, so that the temperature distribution in the width direction of the material to be processed can be made uniform, and uniform temperature rise can be realized. it can.
加えて、制御ゾーン毎に備えられた温度測定手段で、被処理材のて上流側での雰囲気ガスの温度を確実に測定することができるようになるため、被処理材の局部的な過加熱を抑制できるようになる。
すなわち、本技術的手段により、被処理材の長手方向及び幅方向に略均一に昇温できるようになる。
In addition, the temperature measuring means provided for each control zone can reliably measure the temperature of the atmosphere gas upstream of the material to be treated, so that local overheating of the material to be treated is possible. Can be suppressed.
That is, by this technical means, the temperature can be increased substantially uniformly in the longitudinal direction and the width direction of the material to be processed.
好ましくは、前記制御ゾーンの長手方向長さを、幅方向長さの０．１〜０．４倍とするとよい。
こうすることで、それぞれの制御ゾーン内での温度差（最高温度と最低温度との差）を１０℃以内とすることができ、被処理材の幅方向の温度分布を均一化でき、均一な昇温を実現できる。
Preferably, the length in the longitudinal direction of the control zone is 0.1 to 0.4 times the length in the width direction.
By doing so, the temperature difference (the difference between the maximum temperature and the minimum temperature) within each control zone can be made within 10 ° C., the temperature distribution in the width direction of the material to be processed can be made uniform, and the uniform Temperature rise can be realized.
また、前記熱処理炉は、前記制御ゾーン毎に雰囲気ガスを外部に導出する排気口が設けられると共に、該排気口を通過する雰囲気ガスの流量を調整する排気量調整手段を備え、前記排気量調整手段を前記加熱手段での加熱状態に応じて制御する制御装置を有することを特徴とする。
好ましくは、前記加熱手段は直火式バーナで構成され、該直火式バーナで燃焼される燃料の量を基に、前記排気量調整手段が制御される構成となっているとよい。
In addition, the heat treatment furnace is provided with an exhaust port for deriving the atmospheric gas to the outside for each control zone, and further includes an exhaust amount adjusting means for adjusting the flow rate of the atmospheric gas passing through the exhaust port, and the exhaust amount adjustment It has the control apparatus which controls a means according to the heating state in the said heating means.
Preferably, the heating means is constituted by a direct fire type burner, and the exhaust amount adjusting means is controlled based on the amount of fuel burned by the direct fire type burner.
ある制御ゾーンにおいて、昇温のため加熱手段（直火式バーナ）の出力を増し燃焼量を多くした場合、燃焼ガスが隣接する制御ゾーン内に流れ込み、流れ込んだ先の制御ゾーンでは予期しない温度上昇が起こる場合がある。そのような状況を防ぐために、本熱処理炉に備えられた制御装置では、直火式バーナへ供給される燃料の量を基にし、その量が増えた場合は、燃焼ガスの発生も多くなるものとし、排気量調整手段を調整し、排気口から外部に排出する雰囲気ガスの量を多くする。逆に、直火式バーナへ供給される燃料の量が減った場合には、燃焼ガスの発生が少なくなるため、排気量調整手段を調整し、排気口から外部に排出する雰囲気ガスの量を減らすようにする。 In a certain control zone, when the output of the heating means (direct flame burner) is increased to increase the temperature and the combustion amount is increased, the combustion gas flows into the adjacent control zone, and an unexpected temperature rise occurs in the control zone into which it has flowed. May happen. In order to prevent such a situation, the control device provided in the heat treatment furnace is based on the amount of fuel supplied to the direct-fired burner, and if the amount increases, the generation of combustion gas increases. And adjusting the exhaust amount adjusting means to increase the amount of the atmospheric gas discharged from the exhaust port to the outside. Conversely, when the amount of fuel supplied to the direct-fired burner is reduced, the generation of combustion gas is reduced. Therefore, the amount of atmospheric gas discharged outside from the exhaust port is adjusted by adjusting the exhaust amount adjustment means. Try to reduce.
このように制御することで、燃焼ガスが隣接する制御ゾーン内に流れ込むことを防ぐことができて、各制御ゾーンで所定の温度分布を維持できるようになって、被処理材の幅方向の温度分布を均一化でき、均一な昇温を実現できる。
なお、最も好ましい本発明の熱処理炉としては、雰囲気ガスで長尺の被処理材を加熱する熱処理室と、該熱処理室に連通し且つ前記雰囲気ガスを加熱する加熱室とが備えられ、前記熱処理室は、被処理材の長さ方向に設けられた複数の仕切りにより複数の制御ゾーンに区画され、該熱処理室の制御ゾーン毎に、前記雰囲気ガスを当該熱処理室と加熱室との間で循環させ且つその送風方向が正逆切り換え自在である循環手段と、前記被処理材に対して上流側での雰囲気ガスの温度を測定する温度測定手段とが備えられ、前記加熱室は、熱処理室の制御ゾーンに対応し且つ連通する制御ゾーンに区画され、該加熱室の制御ゾーン毎に雰囲気ガスを加熱する加熱手段が設けられており、前記制御ゾーンの長手方向長さを、幅方向長さの０．１〜０．４倍とし、前記制御ゾーン毎に、循環手段の正転で加熱室の雰囲気ガスを熱処理室へ供給する第１熱風通路と、循環手段の逆転で加熱室の雰囲気ガスを熱処理室へ供給する第２熱風通路とを有し、前記第１熱風通路には、排気煙道が排気口を介して設けられ、第２熱風通路には、排気煙道が排気口を介して設けられ、前記第１熱風通路の排気煙道の中途部には排気量調整手段が設けられると共に、前記第２熱風通路の排気煙道の中途部には排気量調整手段が設けられていて、前記循環手段による正転送風時に第１熱風通路の排気煙道を使用可能とすべく当該第１熱風通路の排気煙道に設けられた排気量調整手段を調整すると共に、前記循環手段による逆転送風時に第２熱風通路の排気煙道を使用可能とすべく当該第２熱風通路の排気煙道に設けられた排気量調整手段を調整する制御装置を有するとよい。
また、前記制御装置は、第１熱風通路及び第２熱風通路の排気量調整手段を前記加熱手段での加熱状態に応じて制御するように構成されているとよい。
By controlling in this way, the combustion gas can be prevented from flowing into the adjacent control zones, and a predetermined temperature distribution can be maintained in each control zone. Distribution can be made uniform, and uniform temperature rise can be realized.
The most preferable heat treatment furnace of the present invention includes a heat treatment chamber that heats a long object to be treated with an atmospheric gas, and a heating chamber that communicates with the heat treatment chamber and heats the atmospheric gas. The chamber is partitioned into a plurality of control zones by a plurality of partitions provided in the length direction of the material to be processed, and the atmosphere gas is circulated between the heat treatment chamber and the heating chamber for each control zone of the heat treatment chamber. And a circulating means whose air blowing direction can be switched between forward and reverse, and a temperature measuring means for measuring the temperature of the atmospheric gas on the upstream side with respect to the material to be processed, and the heating chamber is a heat treatment chamber. A heating zone that heats the atmospheric gas is provided for each control zone of the heating chamber. The heating zone is divided into control zones corresponding to and in communication with the control zone. 0.1-0. And a second hot air passage for supplying atmospheric gas in the heating chamber to the heat treatment chamber by forward rotation of the circulation means and a second supply of atmospheric gas in the heating chamber to the heat treatment chamber by reverse rotation of the circulation means for each control zone. and a hot air passage, wherein the first hot air passages, exhaust flue is provided through the exhaust port, the second hot air passages, exhaust flue is provided through the exhaust port, the first An exhaust amount adjusting means is provided in the middle of the exhaust flue of the first hot air passage, and an exhaust amount adjusting means is provided in the middle of the exhaust flue of the second hot air passage. The exhaust air amount adjusting means provided in the exhaust air flue of the first hot air passage is adjusted so that the exhaust air flue of the first hot air passage can be used at the time of the transfer air, and the second hot air passage at the time of reverse blowing by the circulation means In order to be able to use the exhaust flue of the second hot air passage in the exhaust flue An exhaust quantity adjusting means associated may have a control device for adjusting.
Moreover, the said control apparatus is good to be comprised so that the exhaust_gas | exhaustion amount adjustment means of a 1st hot air path and a 2nd hot air path may be controlled according to the heating state in the said heating means.
本発明の熱処理炉は、被処理材をその長手方向及び幅方向に略均一に昇温できる。 The heat treatment furnace of the present invention can raise the temperature of the material to be processed substantially uniformly in the longitudinal direction and the width direction.
以下、本発明の実施の形態を図面に基づき説明する。
図１に示すものは、本発明方法に使用する熱処理炉の断面図である。この実施の形態では、熱処理炉として、厚鋼板を熱処理する台車炉が例示されている。
前記熱処理炉は、燃焼排ガス（雰囲気ガス）が充満する炉室Ｒを有する。この炉室Ｒは、被処理材１を収納するものである。前記熱処理炉は、該炉室Ｒ内の雰囲気ガスを加熱する加熱手段５を有する。また、前記熱処理炉は、循環手段４（循環ファン）を有する。この循環手段４は、前記加熱手段５により加熱された雰囲気ガスを炉室Ｒ内で循環させるものである。この循環手段４は、正逆運転可能とされている。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a heat treatment furnace used in the method of the present invention. In this embodiment, a cart furnace for heat treating a thick steel plate is exemplified as the heat treatment furnace.
The heat treatment furnace has a furnace chamber R filled with combustion exhaust gas (atmosphere gas). The furnace chamber R stores the material 1 to be processed. The heat treatment furnace has a heating means 5 for heating the atmospheric gas in the furnace chamber R. Moreover, the said heat processing furnace has the circulation means 4 (circulation fan). The circulation means 4 circulates the atmospheric gas heated by the heating means 5 in the furnace chamber R. The circulation means 4 is capable of forward / reverse operation.
炉室Ｒの周囲は炉壁１０によって覆われている。炉室Ｒの底部は台車１２によって塞がれている。台車１２には、被処理材載置台１３が設けられ、この載置台１０上に被処理材１が載置されている。
被処理材１は、この実施の形態では、厚鋼板が例示される。被処理材１は、厚さ、幅及び長手方向を有する。図１においては、厚さ方向は上下方向であり、幅方向は左右方向であり、長手方向は紙面に直交する前後方向である。
The periphery of the furnace chamber R is covered with a furnace wall 10. The bottom of the furnace chamber R is closed by a carriage 12. The cart 12 is provided with a processing material mounting table 13, and the processing material 1 is mounted on the mounting table 10.
The workpiece 1 is exemplified by a thick steel plate in this embodiment. The workpiece 1 has a thickness, a width, and a longitudinal direction. In FIG. 1, the thickness direction is the vertical direction, the width direction is the left-right direction, and the longitudinal direction is the front-rear direction orthogonal to the paper surface.
炉室Ｒは水平仕切り壁１９を介して上下に区画されている。この水平仕切り壁１９は、被処理材１の上面から所定間隔を有して上方を塞ぐように水平に配置されている。水平仕切り壁１９によって区画された上側の部屋は加熱室３とされ、下側の部屋は被処理材１を処理する熱処理室２とされている。
加熱室３に加熱手段５が設けられている。この加熱手段５の一例として、コークス炉や高炉で発生したガスを燃焼させる直火式バーナが例示されている。この加熱手段５は、炉体天井部（炉室Ｒの天井部）に取り付けられ、略垂直下方側に向かって火炎を放出するよう構成されている。直火式バーナに供給される燃料ガスの流量は、燃焼量計測手段１８により計測されると共に調整されている。
The furnace chamber R is divided vertically by a horizontal partition wall 19. The horizontal partition wall 19 is disposed horizontally so as to close the upper portion with a predetermined interval from the upper surface of the workpiece 1. The upper chamber partitioned by the horizontal partition wall 19 is a heating chamber 3, and the lower chamber is a heat treatment chamber 2 for processing the workpiece 1.
A heating means 5 is provided in the heating chamber 3. As an example of the heating means 5, a direct fire burner that burns gas generated in a coke oven or a blast furnace is illustrated. This heating means 5 is attached to the furnace body ceiling (the ceiling of the furnace chamber R), and is configured to emit a flame toward a substantially vertical downward side. The flow rate of the fuel gas supplied to the direct flame burner is measured and adjusted by the combustion amount measuring means 18.
炉室Ｒの内側であってその断面右端部（図１の右側）には、上下に貫通する第１熱風通路２５が形成されており、その反対側の端部（図１の左側）にも第２熱風通路２６が上下に貫通して設けられ、この第２熱風通路２６に循環手段４が配置されている。この循環手段４（循環ファン）として軸流ファンが例示されている。この循環手段４の正逆運転は、正逆運転可能な循環ファン電動機１１により行われる。 A first hot air passage 25 penetrating vertically is formed inside the furnace chamber R at the right end of the cross section (right side in FIG. 1), and also on the opposite end (left side in FIG. 1). A second hot air passage 26 is provided penetrating up and down, and the circulation means 4 is disposed in the second hot air passage 26. An axial fan is exemplified as the circulation means 4 (circulation fan). The forward / reverse operation of the circulation means 4 is performed by a circulation fan motor 11 capable of forward / reverse operation.
この循環手段４の正転で、加熱室３の雰囲気ガスは第１熱風通路２５から熱処理室２へ供給され、逆転で加熱室３の雰囲気ガスは第２熱風通路２６から熱処理室２へ供給され、熱処理室２内を正逆循環する。
循環手段４の送風量は、回転数が一定であれば、正転時を（Ｑ正）とし、逆転時を（Ｑ逆）としたとき、両者は等しくなく、（Ｑ正≠Ｑ逆）とされている。
By the normal rotation of the circulation means 4, the atmospheric gas in the heating chamber 3 is supplied from the first hot air passage 25 to the heat treatment chamber 2, and by reverse rotation, the atmospheric gas in the heating chamber 3 is supplied from the second hot air passage 26 to the heat treatment chamber 2. The inside and outside of the heat treatment chamber 2 are circulated forward and backward.
When the rotational speed is constant, the air flow rate of the circulation means 4 is not equal when the forward rotation is (Q positive) and the reverse rotation is (Q reverse), and (Q positive ≠ Q reverse). Has been.
また、第１熱風通路２５に第１温度測定手段８と、第２熱風通路２６に第２温度測定手段９が設けられている。これら両温度測定手段８，９は、循環手段４から送風される熱風の温度を測定するものである。
さらに、第１熱風通路２５には、正転送風時に使用する排気煙道２１が排気口１４を介して連通しており、第２熱風通路２６には、逆転送風時に使用する排気煙道２２が排気口１５を介して連通している。排気煙道２１の中途部には、正転送風時に用いる排気量調整手段１６が設けられ、排気煙道２２の中途部には、逆転送風時に用いる排気量調整手段１７が設けられている。排気煙道を通った雰囲気ガスは、それにつながる排気道２７を通って、外部に導出される。これら排気煙道２１，２２や排気口１４，１５は後述する制御ゾーンごとに設けられている。
The first hot air passage 25 is provided with the first temperature measuring means 8, and the second hot air passage 26 is provided with the second temperature measuring means 9. These temperature measuring means 8 and 9 measure the temperature of the hot air blown from the circulation means 4.
Further, the first hot air passage 25 communicates with an exhaust flue 21 used during normal transfer wind through the exhaust port 14, and the second hot air passage 26 has an exhaust flue 22 used during reverse air blowing. It communicates via the exhaust port 15. In the middle part of the exhaust flue 21, an exhaust amount adjusting means 16 used at the time of forward transfer wind is provided, and in the middle part of the exhaust flue 22, an exhaust amount adjusting means 17 used at the time of reverse blowing is provided. The atmospheric gas passing through the exhaust flue is led out through the exhaust passage 27 connected thereto. The exhaust flues 21 and 22 and the exhaust ports 14 and 15 are provided for each control zone described later.
以上述べた第１及び第２温度測定手段８，９、循環ファン電動機１１、排気量調整手段１６，１７、燃焼量計測手段１８の出力は、制御装置２０へ取り込まれるようになっており、後述する加熱制御を行うものとなっている。制御装置２０からの制御信号は、循環ファン電動機１１、排気量調整手段１６，１７、燃焼量計測手段１８へ入力される。
図２は、熱処理炉の平面図である。熱処理室２は前記長手方向に複数の制御ゾーンに区画されている。各制御ゾーンは、仮想線で示す位置に設けられた垂直仕切壁２３により区画されている。この実施の形態では５個の制御ゾーンが設けられ、各制御ゾーンに前記加熱手段５と循環手段４が一つずつ設けられている。各循環手段４により熱風は前記被処理材の上下表面に沿って幅方向に流れる。
The outputs of the first and second temperature measuring means 8, 9, the circulation fan motor 11, the exhaust amount adjusting means 16, 17, and the combustion amount measuring means 18 described above are taken into the control device 20, and will be described later. The heating control is performed. A control signal from the control device 20 is input to the circulation fan motor 11, the exhaust amount adjusting means 16, 17, and the combustion amount measuring means 18.
FIG. 2 is a plan view of the heat treatment furnace. The heat treatment chamber 2 is partitioned into a plurality of control zones in the longitudinal direction. Each control zone is partitioned by a vertical partition wall 23 provided at a position indicated by a virtual line. In this embodiment, five control zones are provided, and one heating means 5 and one circulation means 4 are provided in each control zone. The hot air flows in the width direction along the upper and lower surfaces of the material to be treated by each circulation means 4.
前記制御ゾーンの区画長さは、熱処理炉の幅（炉幅）の０．１〜０．４倍とするのがよい。その根拠が図４に示されている。すなわち、図４には、区画長さを変化させた場合における制御ゾーン内の温度差を測定した結果が示されている。制御ゾーン内の温度差とは被処理材１の長さ方向に１つの制御ゾーンで３点以上測定した雰囲気ガス温度の最高値と最低値との差を示しており、第１及び第２温度測定手段８，９以外に実験用の熱電対を設置して測定を行った。実験条件は炉幅５ｍ、循環ガス温度６００℃であって、炉幅に対して０．４倍以下の区画長さでゾーン内温度差は１０℃以下と均一な温度分布になっている。 The section length of the control zone is preferably 0.1 to 0.4 times the width of the heat treatment furnace (furnace width). The basis for this is shown in FIG. That is, FIG. 4 shows the result of measuring the temperature difference in the control zone when the section length is changed. The temperature difference in the control zone indicates the difference between the highest value and the lowest value of the atmospheric gas temperature measured at three or more points in one control zone in the length direction of the material 1 to be processed. Measurement was performed by installing an experimental thermocouple in addition to the measurement means 8 and 9. The experimental conditions were a furnace width of 5 m, a circulating gas temperature of 600 ° C., a zone length of 0.4 times or less of the furnace width, and a uniform temperature distribution with a temperature difference in the zone of 10 ° C. or less.
図３は、制御ゾーンの１つを長さ方向断面図として示したものである。
熱処理室２と加熱室３とを区切る水平仕切り壁１９から耐熱用鋼板を被処理材１の直上まで吊り下げて熱処理室ゾーン仕切り壁７（垂直仕切壁２３）を構成している。熱処理室ゾーン仕切り壁７は耐熱用鋼板に限るものではなく、その他の金属材料や耐火断熱材で構成してもよい。かかる熱処理室ゾーン仕切り壁７の設置によって隣り合うゾーンの循環ガスの熱処理室内での混合を防ぎ、制御ゾーンの独立性を高めて被処理材１を長さ方向に均一な温度分布とできる。
FIG. 3 shows one of the control zones as a longitudinal section.
A heat-resistant steel plate is suspended from the horizontal partition wall 19 separating the heat treatment chamber 2 and the heating chamber 3 to the position immediately above the workpiece 1 to form the heat treatment chamber zone partition wall 7 (vertical partition wall 23). The heat treatment chamber zone partition wall 7 is not limited to a heat-resistant steel plate, and may be composed of other metal materials or refractory heat insulating materials. By installing such a heat treatment chamber zone partition wall 7, mixing of circulating gas in adjacent zones in the heat treatment chamber can be prevented, and the independence of the control zone can be increased, so that the material to be treated 1 can have a uniform temperature distribution in the length direction.
なお、本実施形態では、加熱室３も熱処理室２と同様に加熱室ゾーン仕切り壁６で区切った場合を示しており、加熱室ゾーン仕切り壁６は熱処理の天井から吊り下げたパイプと耐火断熱材で構成している。
かかる構成を有する熱処理炉で、被処理材を加熱すると、(i)熱処理室２が、被処理材１の長手方向に区画されて制御ゾーンとなっているため、各制御ゾーンの高温雰囲気ガスが熱処理炉内で混合することを防止することができ、熱処理炉の長さ方向の温度分布を所定のものとすることができる。(ii)循環手段４により、制御ゾーン毎、雰囲気ガスを風向が正逆切り換え自在に循環させることができるようになるため、被処理材の幅方向の温度分布を均一化でき、均一な昇温を実現できる。(iii)制御ゾーン毎に備えられた温度測定手段，９で、被処理材１の上流側での雰囲気ガスの温度を確実に測定することができるようになるため、被処理材１の局部的な過加熱を抑制できるようになる。
In the present embodiment, the heating chamber 3 is also divided by the heating chamber zone partition wall 6 in the same manner as the heat treatment chamber 2, and the heating chamber zone partition wall 6 is formed of a pipe suspended from the ceiling of the heat treatment and fireproof insulation. It consists of materials.
When the material to be treated is heated in the heat treatment furnace having such a configuration, (i) the heat treatment chamber 2 is partitioned in the longitudinal direction of the material 1 to be a control zone. Mixing in the heat treatment furnace can be prevented, and the temperature distribution in the length direction of the heat treatment furnace can be made predetermined. (ii) The circulation means 4 allows the atmospheric gas to be circulated in each control zone so that the wind direction can be switched between forward and reverse, so that the temperature distribution in the width direction of the material to be processed can be made uniform and the temperature can be increased uniformly. Can be realized. (iii) Since the temperature measuring means 9 provided for each control zone can reliably measure the temperature of the atmospheric gas on the upstream side of the material 1 to be processed, Overheating can be suppressed.
前記熱処理炉を用いた被処理材１の加熱方法は次のとおりである。
まず、循環する雰囲気ガスが正転送風時には、第１温度測定手段８でその温度を測定し、逆転送風時には第２温度測定手段９で測定し、測定温度が設定した熱パターンとなるように加熱手段５の燃焼量を制御する。このように被処理材に対して必ず上流の循環ガス温度を測定し制御することで目標とする温度以上の高温部を生じさせることなく昇温できる。
The heating method of the to-be-processed material 1 using the said heat processing furnace is as follows.
First, when the circulating atmosphere gas is forward transfer air, the temperature is measured by the first temperature measuring means 8, and when the reversing air is blown, the temperature is measured by the second temperature measuring means 9 and heated so that the measured temperature becomes a set heat pattern. The combustion amount of the means 5 is controlled. As described above, the temperature of the circulating gas is always measured and controlled with respect to the material to be processed, so that the temperature can be increased without generating a high temperature portion higher than the target temperature.
また、制御装置２０は、循環手段４の送風方向を切り換えるようにもしている。詳しくは、正逆の送風時間（Ｔ正，Ｔ逆）の比率と、正逆の送風量（Ｑ正，Ｑ逆）の比率のべき乗とが比例するものとして、熱処理炉を操業している。正逆の送風時間比率と、正逆の送風量の比率との関係の一例として、式（１）の関係を採用することは好ましい。
Ｔ正／Ｔ逆＝（Ｑ正／Ｑ逆）a ・・・（１）
但し、ａ＝０．８〜０．９
こうすることで、被処理材１の昇温時間差を可能な限り小さくすることが可能となる。
In addition, the control device 20 is configured to switch the blowing direction of the circulation means 4. Specifically, the heat treatment furnace is operated on the assumption that the ratio of the forward / reverse blowing time (T forward, T reverse) and the power of the forward / reverse blown amount (Q forward, Q reverse) are proportional. As an example of the relationship between the forward / reverse air blowing time ratio and the forward / reverse air flow rate ratio, it is preferable to adopt the relationship of Expression (1).
T forward / T reverse = (Q forward / Q reverse) a (1)
However, a = 0.8-0.9
By doing so, it is possible to make the temperature increase time difference of the material 1 to be processed as small as possible.
さらに、本実施形態の如く、加熱手段５に直火式バーナが採用されている場合は、排気口１４，１５を介して外部に排気する雰囲気ガスの流量は、燃焼量計測手段１８により測定した燃焼量にもとづいて決定し、制御装置２０からの指令によって、排気量調整手段１６，１７を用いて調整するようにする。
具体的には、空気比ｍで燃焼している理論空気量Ａ、理論排ガス量Ｇの燃料を使用している場合、燃焼量計測手段１８で計測される燃料流量をＱｆとすると、燃焼によって発生するガス量Ｑｇは、
Ｑｇ＝（（ｍ−１）×Ａ＋Ｇ）×Ｑｆ ・・・（２）
と求められる。例えば、各制御ゾーンで燃料流量Ｑｆを測定し、各々で発生するガス量Ｑｇを算定し、排気流量Ｑｅを次式により設定する。
Ｑｅ＝Ｋ×Ｑｇ ・・・（３）
ここで、Ｋの値は全ての制御ゾーンで１としているが、制御ゾーン毎に変更してもよい。
Further, as in the present embodiment, when a direct-fire burner is employed as the heating means 5, the flow rate of the atmospheric gas exhausted to the outside through the exhaust ports 14 and 15 is measured by the combustion amount measuring means 18. It is determined based on the combustion amount, and is adjusted using the exhaust amount adjusting means 16 and 17 in accordance with a command from the control device 20.
Specifically, when a fuel having a theoretical air amount A and a theoretical exhaust gas amount G burning at an air ratio m is used, if the fuel flow rate measured by the combustion amount measuring means 18 is Qf, it is generated by combustion. The amount of gas Qg
Qg = ((m−1) × A + G) × Qf (2)
Is required. For example, the fuel flow rate Qf is measured in each control zone, the gas amount Qg generated in each is calculated, and the exhaust flow rate Qe is set by the following equation.
Qe = K × Qg (3)
Here, the value of K is set to 1 in all control zones, but may be changed for each control zone.
また、燃焼量を測定するために燃料流量に加えて燃焼空気流量を測定してもよい。
このように、排気量調整手段を前記加熱手段での加熱状態に応じて制御することで、「全ての制御ゾーンの排気流量を同量であって隣り合う制御ゾーンの燃焼量が異なる場合に、燃焼量の多いゾーンから少ないゾーンへ雰囲気ガスが流れ込む」といった状況が発生することを防ぐことができるようになる。そのため、長さ方向の温度分布を均一とできる。
Further, in order to measure the combustion amount, the combustion air flow rate may be measured in addition to the fuel flow rate.
In this way, by controlling the exhaust amount adjusting means according to the heating state in the heating means, "when the exhaust flow rate of all control zones is the same amount and the combustion amount of adjacent control zones is different, It is possible to prevent a situation in which the atmospheric gas flows from a zone with a large amount of combustion into a zone with a small amount of combustion. Therefore, the temperature distribution in the length direction can be made uniform.
具体的には、各制御ゾーンに排気口１４，１５等の排気手段を設けず、排気流量制御も行っていない設備では最大３０℃あった熱処理炉内の温度差（炉内温度差）が、本発明を適用することで１２℃にまで低減することができた。炉内温度差は前記ゾーン内温度差と同様に実験用熱電対によって各制御ゾーンの長さ方向に３点以上循環ガス温度を測定した時の、炉内での最高値と最低値の差を示す。 Specifically, the temperature difference in the heat treatment furnace (in-furnace temperature difference), which is 30 ° C. at the maximum in the equipment that does not provide the exhaust means such as the exhaust ports 14 and 15 in each control zone and does not control the exhaust flow rate, By applying the present invention, the temperature could be reduced to 12 ° C. The temperature difference in the furnace is the difference between the maximum value and the minimum value in the furnace when the temperature of the circulating gas is measured at three or more points in the length direction of each control zone by the experimental thermocouple in the same way as the temperature difference in the zone. Show.
なお、本発明は、前記実施の形態に示したものに限定されるものではなく、熱処理炉として、加熱室３が下方に設けられ熱処理室２が上方に設けられたものであってもよく、その形式は限定されるものではない。 In addition, this invention is not limited to what was shown to the said embodiment, As a heat processing furnace, the heating chamber 3 may be provided below and the heat processing chamber 2 may be provided above, The format is not limited.
１ 被処理材
２ 熱処理室
３ 加熱室
４ 循環手段
５ 加熱手段
８ 第１温度測定手段（正転）
９ 第２温度測定手段（逆転）
１４ 排気口（正転）
１５ 排気口（逆転）
１６ 排気量調整手段（正転）
１７ 排気量調整手段（逆転）
２１ 排気煙道（正転）
２２ 排気煙道（逆転）
1 Material to be treated 2 Heat treatment chamber 3 Heating chamber 4 Circulating means 5 Heating means 8 First temperature measuring means (forward rotation)
9 Second temperature measurement means (reverse)
14 Exhaust port (forward rotation)
15 Exhaust port (reverse)
16 Displacement adjustment means (forward rotation)
17 Displacement adjustment means (reverse)
21 Exhaust flue (forward rotation)
22 Exhaust flue (reverse)
Claims (3)
前記熱処理室は、被処理材の長さ方向に設けられた複数の仕切りにより複数の制御ゾーンに区画され、該熱処理室の制御ゾーン毎に、前記雰囲気ガスを当該熱処理室と加熱室との間で循環させ且つその送風方向が正逆切り換え自在である循環手段と、前記被処理材に対して上流側での雰囲気ガスの温度を測定する温度測定手段とが備えられ、
前記加熱室は、熱処理室の制御ゾーンに対応し且つ連通する制御ゾーンに区画され、該加熱室の制御ゾーン毎に雰囲気ガスを加熱する加熱手段が設けられており、
前記制御ゾーンの長手方向長さを、幅方向長さの０．１〜０．４倍とし、
前記制御ゾーン毎に、循環手段の正転で加熱室の雰囲気ガスを熱処理室へ供給する第１熱風通路と、循環手段の逆転で加熱室の雰囲気ガスを熱処理室へ供給する第２熱風通路とを有し、
前記第１熱風通路には、排気煙道が排気口を介して設けられ、第２熱風通路には、排気煙道が排気口を介して設けられ、前記第１熱風通路の排気煙道の中途部には排気量調整手段が設けられると共に、前記第２熱風通路の排気煙道の中途部には排気量調整手段が設けられていて、
前記循環手段による正転送風時に第１熱風通路の排気煙道を使用可能とすべく当該第１熱風通路の排気煙道に設けられた排気量調整手段を調整すると共に、前記循環手段による逆転送風時に第２熱風通路の排気煙道を使用可能とすべく当該第２熱風通路の排気煙道に設けられた排気量調整手段を調整する制御装置を有する
ことを特徴とする熱処理炉。 A heat treatment chamber for heating a long object to be treated with an atmospheric gas, and a heating chamber for communicating with the heat treatment chamber and for heating the atmospheric gas,
The heat treatment chamber is partitioned into a plurality of control zones by a plurality of partitions provided in the length direction of the material to be processed, and the atmosphere gas is passed between the heat treatment chamber and the heating chamber for each control zone of the heat treatment chamber. And a circulation means that can be switched between forward and reverse, and a temperature measurement means that measures the temperature of the atmospheric gas upstream of the material to be treated.
The heating chamber is divided into control zones corresponding to and communicating with the control zone of the heat treatment chamber, and heating means for heating the atmospheric gas is provided for each control zone of the heating chamber,
The length in the longitudinal direction of the control zone is 0.1 to 0.4 times the length in the width direction,
For each control zone, a first hot air passage for supplying atmospheric gas in the heating chamber to the heat treatment chamber by forward rotation of the circulation means, and a second hot air passage for supplying atmospheric gas in the heating chamber to the heat treatment chamber by reverse rotation of the circulation means, Have
Wherein the first hot air passages, exhaust flue is provided through the exhaust port, the second hot air passages, exhaust flue is provided through the exhaust port, the exhaust duct of the first hot air passage An exhaust amount adjusting means is provided in the middle part, and an exhaust amount adjusting means is provided in the middle part of the exhaust flue of the second hot air passage,
The exhaust air amount adjusting means provided in the exhaust flue of the first hot air passage is adjusted so that the exhaust flue of the first hot air passage can be used at the time of the normal transfer wind by the circulation means, and the reverse air flow by the circulation means A heat treatment furnace characterized by having a control device for adjusting an exhaust amount adjusting means provided in the exhaust flue of the second hot air passage so that the exhaust flue of the second hot air passage is sometimes usable .
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| JP2564895Y2 (en) * | 1992-06-26 | 1998-03-11 | 石川島播磨重工業株式会社 | Infusible furnace |
| JP3796117B2 (en) * | 1999-12-28 | 2006-07-12 | 新日本製鐵株式会社 | Method of heating steel for hot rolling |
| JP4402846B2 (en) * | 2001-02-20 | 2010-01-20 | 中外炉工業株式会社 | Continuous firing furnace for flat glass substrates |
| JP2003021462A (en) * | 2001-07-10 | 2003-01-24 | Tdk Corp | Combustion heating furnace |
| JP2003172583A (en) * | 2001-12-04 | 2003-06-20 | Shoei Seisakusho:Kk | Heat treatment device for plasma display panel |
| JP2004144421A (en) * | 2002-10-25 | 2004-05-20 | Denso Corp | Open flame gas burner furnace |
| JP2007002301A (en) * | 2005-06-23 | 2007-01-11 | Kobe Steel Ltd | Heating method in heat-treating furnace |
-
2005
- 2005-06-23 JP JP2005184110A patent/JP4583256B2/en not_active Expired - Lifetime
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