JPH0894006A - Radiant tube - Google Patents
Radiant tubeInfo
- Publication number
- JPH0894006A JPH0894006A JP23178494A JP23178494A JPH0894006A JP H0894006 A JPH0894006 A JP H0894006A JP 23178494 A JP23178494 A JP 23178494A JP 23178494 A JP23178494 A JP 23178494A JP H0894006 A JPH0894006 A JP H0894006A
- Authority
- JP
- Japan
- Prior art keywords
- straight pipe
- pipe portion
- radiant tube
- expansion
- joint
- 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.)
- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- 239000000567 combustion gas Substances 0.000 claims description 20
- 239000010960 cold rolled steel Substances 0.000 abstract description 14
- 230000002040 relaxant effect Effects 0.000 abstract description 3
- 230000008642 heat stress Effects 0.000 abstract 1
- 230000008646 thermal stress Effects 0.000 description 28
- 238000010438 heat treatment Methods 0.000 description 24
- 239000007789 gas Substances 0.000 description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 238000003466 welding Methods 0.000 description 14
- 229910052742 iron Inorganic materials 0.000 description 9
- 238000000137 annealing Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 7
- 238000011144 upstream manufacturing Methods 0.000 description 7
- 230000008602 contraction Effects 0.000 description 6
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Landscapes
- Gas Burners (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、被加熱物を間接的に加
熱するラジアントチューブに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiant tube for indirectly heating an object to be heated.
【０００２】[0002]
【従来の技術】一般に加熱処理は、産業上のあらゆる分
野において広く行われている。特に金属産業において
は、加熱による熱処理によって金属の特性が大きく変化
するので、優れた特性を得るために様々な熱処理が行わ
れている。たとえば最も一般的な金属の１つである冷間
圧延鋼帯は、冷間圧延によって加工硬化した鋼素地を軟
化焼鈍させるために加熱炉において熱処理が施されてい
る。この熱処理には、様々な加熱方式が用いられてお
り、たとえば冷間圧延鋼帯を連続的に通板しつつ加熱す
る連続焼鈍炉においては、通常無酸化雰囲気または還元
雰囲気中でラジアントチューブによる間接加熱が行われ
ている。ラジアントチューブは、一般にバーナにて燃焼
したガスがラジアントチューブ内を通り出口より排出さ
れる過程において、ラジアントチューブ自身の温度を８
００〜１０００℃に加熱し、被加熱冷間圧延鋼帯を輻射
熱によって加熱するものである。2. Description of the Related Art Generally, heat treatment is widely used in all industrial fields. In particular, in the metal industry, since the characteristics of the metal are greatly changed by the heat treatment by heating, various heat treatments are performed in order to obtain excellent characteristics. For example, cold-rolled steel strip, which is one of the most common metals, is subjected to heat treatment in a heating furnace in order to soften and anneal a steel body that has been work-hardened by cold rolling. For this heat treatment, various heating methods are used.For example, in a continuous annealing furnace that heats a cold-rolled steel strip while continuously passing it through a strip, it is usually indirect by a radiant tube in a non-oxidizing atmosphere or a reducing atmosphere. Heating is taking place. The radiant tube generally has a temperature of the radiant tube which is 8% in the process in which the gas burned in the burner passes through the radiant tube and is discharged from the outlet.
This is to heat the cold-rolled steel strip to be heated to 00 to 1000 ° C. by radiant heat.
【０００３】図１２は、従来型のＷ型ラジアントチュー
ブの簡略化された構成を示す部分断面図である。従来型
のラジアントチューブ１８は、第１直管部１、第２直管
部２、第３直管部３、第４直管部４と、ラジアントチュ
ーブ１８の経路を反転させる第１屈曲部５、第２屈曲部
６、第３屈曲部７と、バーナ側フランジ８と、排ガス側
フランジ９と、中間支持台１０ａ，１０ｂと、先端支持
台１１とを含んで構成される。前記第１直管部１の基端
部には、前記バーナ側フランジ８が設けられており、そ
のバーナ側フランジ８は炉の鉄皮１３にボルトまたは溶
接によって固定されている。また前記バーナ側フランジ
８には、燃焼バーナ１２が設けられており、燃料を第１
直管部１の内部で燃焼させる。FIG. 12 is a partial cross-sectional view showing a simplified structure of a conventional W type radiant tube. The conventional radiant tube 18 includes a first straight pipe portion 1, a second straight pipe portion 2, a third straight pipe portion 3, a fourth straight pipe portion 4, and a first bent portion 5 that reverses a path of the radiant tube 18. , The second bent portion 6, the third bent portion 7, the burner side flange 8, the exhaust gas side flange 9, the intermediate support bases 10a and 10b, and the tip support base 11. The burner-side flange 8 is provided at the base end of the first straight pipe portion 1, and the burner-side flange 8 is fixed to the iron shell 13 of the furnace by bolts or welding. Further, the burner side flange 8 is provided with a combustion burner 12 for supplying the fuel to the first
It is burned inside the straight pipe part 1.
【０００４】前記ラジアントチューブ１８は、燃焼ガス
の流れ方向の上流側から前記第１直管部１、第１屈曲部
５、第２直管部２、第２屈曲部６、第３直管部３、第３
屈曲部７、第４直管部４の順に配設され、各端部が溶接
によって接合されてＷ型に形成される。またこれらの各
軸線は同一鉛直面内に存在する。前記第４直管部４の基
端部には、前記排ガス側フランジ９が設けられており、
その排ガス側フランジ９は炉の鉄皮１３にボルトまたは
溶接によって固定されている。The radiant tube 18 includes the first straight pipe portion 1, the first bent portion 5, the second straight pipe portion 2, the second bent portion 6, and the third straight pipe portion from the upstream side in the flow direction of the combustion gas. 3, third
The bent portion 7 and the fourth straight pipe portion 4 are arranged in this order, and each end portion is joined by welding to form a W shape. Each of these axes lies in the same vertical plane. The exhaust gas side flange 9 is provided at the base end portion of the fourth straight pipe portion 4,
The exhaust gas side flange 9 is fixed to the iron shell 13 of the furnace by bolts or welding.
【０００５】前記中間支持台１０ａは、前記第２直管部
２の一端部寄りの下部を臨む第３直管部３の外周面上に
溶接によって接合されており、第２直管部２の一端部寄
りの下部を前記第２直管部２の軸線方向に相互に変位可
能に支持している。このため該中間支持台１０ａは、ラ
ジアントチューブ１８のクリープ変形を確実に防止する
ことができる。また前記中間支持台１０ｂも前記中間支
持台１０ａと同様に前記第３直管部３の一端部寄りの下
部を臨む第４直管部４の外周面上に溶接によって接合さ
れている。前記先端支持台１１は、第３屈曲部７の炉壁
１４ａを臨む先端部外周面上に溶接によって接合されて
おり、前記炉壁１４ａに設けられている受け台１１ａ上
に載置されている。前記先端支持台１１と受け台１１ａ
とは固定されていないので、摺動変位することができ
る。The intermediate support base 10a is joined by welding to the outer peripheral surface of the third straight pipe portion 3 which faces the lower portion near the one end of the second straight pipe portion 2 and is welded to the second straight pipe portion 2. A lower portion near one end is supported so as to be displaceable in the axial direction of the second straight pipe portion 2. Therefore, the intermediate support base 10a can reliably prevent the creep deformation of the radiant tube 18. Similarly to the intermediate support table 10a, the intermediate support table 10b is also welded to the outer peripheral surface of the fourth straight tube section 4 which faces the lower part near the one end of the third straight tube section 3. The tip support base 11 is joined by welding to the outer peripheral surface of the tip portion of the third bent portion 7 that faces the furnace wall 14a, and is mounted on the pedestal 11a provided on the furnace wall 14a. . The tip support base 11 and the receiving base 11a
Since and are not fixed, they can be slid and displaced.
【０００６】燃焼ガスが前記ラジアントチューブ１８内
を通る過程において、熱が冷間圧延鋼帯に吸熱されるの
で、前記ラジアントチューブ１８の表面温度は、燃焼ガ
ス流れ方向の上流側であるバーナ側で高く、下流側であ
る排ガス側で低くなる。前述のように前記ラジアントチ
ューブ１８においては、バーナ側と排ガス側の両端が前
記鉄皮１３に固定されているので、前記温度差のため
に、軸線方向に熱応力が発生する。すなわちバーナ側で
は、低温の排ガス側により熱膨張を妨げられるので、圧
縮応力が発生し、排ガス側では高温のバーナ側により引
伸ばされるので、引張り応力が発生する。この熱応力
は、前記ラジアントチューブ１８に亀裂や変形を生じさ
せ、該ラジアントチューブ１８の寿命を大幅に低下させ
るので、従来から問題になっており改善が求められてい
る。In the process of the combustion gas passing through the inside of the radiant tube 18, heat is absorbed by the cold-rolled steel strip, so that the surface temperature of the radiant tube 18 is on the burner side which is the upstream side in the combustion gas flow direction. High, and low on the exhaust gas side, which is the downstream side. As described above, in the radiant tube 18, both ends on the burner side and the exhaust gas side are fixed to the iron shell 13, so that thermal stress is generated in the axial direction due to the temperature difference. That is, on the burner side, thermal expansion is hindered by the low-temperature exhaust gas side, so compressive stress is generated, and on the exhaust gas side, high-temperature burner side is stretched, so tensile stress is generated. This thermal stress causes cracks and deformations in the radiant tube 18 and significantly shortens the life of the radiant tube 18, which has been a problem from the past and needs to be improved.
【０００７】前記問題点を解決する先行技術としては、
たとえば実公平３−３５９２４号公報に開示されている
ようなラジアントチューブが提案されている。図１３
は、先行技術のＷ型ラジアントチューブの簡略化された
構成を示す部分断面図である。図１２と対応する部分に
は、同一の参照符号を付す。図１３に示すＷ型ラジアン
トチューブ１９の構成は、図１２に示すＷ型ラジアント
チューブ１８に下記伸縮管継手１５と、支持円筒１６と
を付加したものであり、その他の構成は全く同一であ
る。As a prior art for solving the above problems,
For example, a radiant tube as disclosed in Japanese Utility Model Publication No. 3-35924 is proposed. FIG.
FIG. 3 is a partial cross-sectional view showing a simplified configuration of a prior art W-shaped radiant tube. The parts corresponding to those in FIG. 12 are designated by the same reference numerals. The W-type radiant tube 19 shown in FIG. 13 is the same as the W-type radiant tube 18 shown in FIG. 12 except that an expansion joint 15 and a support cylinder 16 are added, and the other configurations are exactly the same.
【０００８】図１３に示すように前記ラジアントチュー
ブ１９の第４直管部４の基端部には、軸線方向に熱応力
に応じて伸縮することができる伸縮管継手１５が設けら
れている。該伸縮管継手１５の設置位置は、炉壁１４内
でかつ前記鉄皮１３に近い位置である。このため前記伸
縮管継手１５は、前記炉壁１４によって前記ラジアント
チューブ１９からの輻射熱を遮蔽されるので、該伸縮管
継手１５の温度上昇が抑制され、該伸縮管継手の寿命が
延長される。As shown in FIG. 13, at the base end of the fourth straight pipe portion 4 of the radiant tube 19, there is provided an expansion pipe joint 15 capable of expanding and contracting in the axial direction according to thermal stress. The expansion pipe joint 15 is installed at a position within the furnace wall 14 and close to the iron shell 13. Therefore, the expansion pipe joint 15 is shielded from the radiant heat from the radiant tube 19 by the furnace wall 14, so that the temperature rise of the expansion pipe joint 15 is suppressed and the life of the expansion pipe joint is extended.
【０００９】前記炉壁１４には、前記支持円筒１６が装
着されている。該支持円筒１６の一端は、前記鉄皮１３
に溶接されていて、他端は前記ラジアントチューブ１９
の前記第４直管部４の外径と前記支持円筒１６の内径の
差が小さく、たとえば半径で２ｍｍ以内になるように設
定されている。該支持円筒１６は、前記ラジアントチュ
ーブ１９の軸線直角方向の変形を支持する。The support cylinder 16 is mounted on the furnace wall 14. One end of the support cylinder 16 has the iron shell 13
Is welded to the radiant tube 19 at the other end.
The difference between the outer diameter of the fourth straight pipe portion 4 and the inner diameter of the support cylinder 16 is small, and for example, the radius is set to be within 2 mm. The support cylinder 16 supports the deformation of the radiant tube 19 in the direction perpendicular to the axis.
【００１０】このように構成された該ラジアントチュー
ブ１９において、バーナ側の第１直管部１と排ガス側の
第４直管部４との間に前記温度差が生じた場合、前述の
とおり該ラジアントチューブ１９のバーナ側と排ガス側
に伸縮差が生じ、軸線方向に熱応力が発生する。しかし
ながらこの熱応力は前記伸縮管継手１５の弾性変形によ
って吸収緩和されるので、従来から問題であった熱応力
に起因する該ラジアントチューブ１９の亀裂や変形の発
生を低減することができる。In the radiant tube 19 thus constructed, when the temperature difference occurs between the first straight pipe portion 1 on the burner side and the fourth straight pipe portion 4 on the exhaust gas side, as described above, A difference in expansion and contraction occurs between the burner side and the exhaust gas side of the radiant tube 19, and thermal stress is generated in the axial direction. However, since this thermal stress is absorbed and relaxed by the elastic deformation of the expansion joint 15, the occurrence of cracks and deformation of the radiant tube 19 due to the thermal stress, which has been a problem in the past, can be reduced.
【００１１】[0011]
【発明が解決しようとする課題】前述のように先行技術
による該ラジアントチューブ１９は、前記伸縮管継手１
５によって軸線方向の熱応力を吸収緩和することができ
る。しかしながら該ラジアントチューブ１９の熱応力
は、軸線方向だけでなく軸線直角方向においても発生す
る。すなわち該ラジアントチューブ１９の軸直角断面で
は、鉛直方向の上面側が下面側に比べて温度が高い。こ
のため該ラジアントチューブ１９の軸直角断面では、上
面側は下面側に伸長を妨げられて圧縮応力が発生し、下
面側では上面側によって引伸ばされて引張り応力が発生
する。この現象は、温度差の大きいバーナ側の前記第１
直管部１では顕著であるけれども、温度差の小さい前記
第４直管部４ではほとんど認められない。このような軸
線直角方向の熱応力は、軸線方向の熱応力と合成され、
合力として複雑な熱応力が形成される。このため前記伸
縮管継手１５が軸線直角方向に変位して前記支持円筒１
６に接触し、破損する可能性がある。また前記伸縮管継
手１５は、前記ラジアントチューブ１９の最も排ガス側
に位置する前記第４直管部４の基端部に設けられている
ので、前記中間支持台１０ａ，１０ｂおよび前記先端支
持台１１がすべて摺動抵抗として作用し、熱応力が吸収
緩和されにくいという問題点もある。As described above, the radiant tube 19 according to the prior art has the expansion joint 1
5, the thermal stress in the axial direction can be absorbed and relaxed. However, the thermal stress of the radiant tube 19 is generated not only in the axial direction but also in the direction orthogonal to the axial line. That is, in the cross section perpendicular to the axis of the radiant tube 19, the temperature is higher on the upper surface side in the vertical direction than on the lower surface side. For this reason, in the cross section perpendicular to the axis of the radiant tube 19, the upper surface side is prevented from expanding toward the lower surface side to generate compressive stress, and the lower surface side is stretched by the upper surface side to generate tensile stress. This phenomenon is caused by the above-mentioned first phenomenon on the burner side with a large temperature difference.
Although it is remarkable in the straight pipe portion 1, it is hardly recognized in the fourth straight pipe portion 4 having a small temperature difference. Such thermal stress in the direction perpendicular to the axis is combined with thermal stress in the axial direction,
Complex thermal stress is formed as the resultant force. Therefore, the expansion joint 15 is displaced in the direction perpendicular to the axis to move the support cylinder 1
6 may be contacted and damaged. Further, since the expansion joint 15 is provided at the base end portion of the fourth straight pipe portion 4 located closest to the exhaust gas side of the radiant tube 19, the intermediate support bases 10a and 10b and the tip support base 11 are provided. Also acts as a sliding resistance, and there is a problem that thermal stress is difficult to be absorbed and relaxed.
【００１２】本発明の目的は、前記問題点を解決し、熱
応力を吸収緩和し寿命を大幅に延ばすことができるラジ
アントチューブを提供することにある。An object of the present invention is to solve the above problems and provide a radiant tube capable of absorbing and relaxing thermal stress and significantly extending its life.
【００１３】[0013]
【課題を解決するための手段】本発明は、上下に配置さ
れ、ほぼ水平な軸線をそれぞれ有する直管部と、直管部
の端部を相互に連結して単一の燃焼炎または燃焼ガスの
通路を直管部とともに形成する屈曲部と、直管部の被加
熱物に臨む部分の途中に設けられ、直管部の軸線方向お
よび軸線直角方向に伸縮可能な伸縮管継手とを含むこと
を特徴とするラジアントチューブである。また本発明
は、前記伸縮管継手は、上下に配置された複数の直管部
のうち最下部の直管部以外の直管部に設けられ、伸縮管
継手が設けてある直管部は、それよりも下方の直管部に
支持部材を介在して支持されることを特徴とする。また
本発明は、支持部材は、伸縮管継手を有する直管部の下
部を受け、かつ直管部の軸線方向に相互に変位可能に支
持する直管部の軸線に垂直な平面内で下に凸の円弧状の
受面を有する受け部材と、受け部材の下部に上端部が固
定され伸縮管継手が介在される直管部よりも下方の直管
部の上部に下端部が固定される脚とを有することを特徴
とする。また本発明は、鉛直面内に軸線を有し、上下に
間隔をあけて水平に配置される上から順に第１直管部〜
第４直管部と、第１直管部の遊端部と第２直管部の一端
部とを連結接続する第１屈曲部と、第２直管部の他端部
と第３直管部の一端部とを連結接続する第２屈曲部と、
第３直管部の他端部と第４直管部の一端部とを連結接続
する第３屈曲部と、第３直管部の前記一端部寄りに介在
される伸縮管継手と、第２直管部の前記一端部寄りの下
部を支持する第１支持部材と、伸縮管継手の一端部寄り
の前記第３直管部下部を支持する第２支持部材と、伸縮
管継手の他端部寄りの前記第３直管部下部を支持する第
３支持部材と、第３屈曲部を支持する第４支持部材と、
第１直管部の基端部に取付けられるバーナとを含み、第
１直管部〜第４直管部と第１屈曲部〜第３屈曲部と伸縮
管継手とによってバーナからの燃焼炎または燃焼ガスを
導くことを特徴とする。DISCLOSURE OF THE INVENTION The present invention is directed to a single combustion flame or combustion gas in which straight pipe portions arranged vertically and having substantially horizontal axes and end portions of the straight pipe portions are connected to each other. A bent portion that forms the passage of the straight pipe portion together with the straight pipe portion, and an expansion joint that is provided in the middle of the portion of the straight pipe portion that faces the object to be heated and that can expand and contract in the axial direction and the orthogonal direction of the straight pipe portion. It is a radiant tube characterized by. Further, the present invention, the expansion pipe joint is provided in a straight pipe portion other than the lowest straight pipe portion of the plurality of straight pipe portions arranged vertically, the straight pipe portion provided with the expansion pipe joint, It is characterized in that it is supported with a supporting member interposed in the straight pipe portion below it. Further, according to the present invention, the support member receives the lower portion of the straight pipe portion having the expansion joint, and supports the straight pipe portion downwardly in a plane perpendicular to the axis of the straight pipe portion, which supports the straight pipe portion so as to be mutually displaceable in the axial direction. A receiving member having a convex arcuate receiving surface, and a leg having a lower end fixed to an upper portion of a straight pipe portion lower than a straight pipe portion having an upper end fixed to the lower portion of the receiving member and having an expansion joint. And having. Moreover, this invention has an axis in a vertical plane, is arrange | positioned horizontally at a space | interval in the up-and-down direction, from the 1st straight pipe part-in order from the top.
A fourth straight pipe portion, a first bent portion connecting and connecting the free end portion of the first straight pipe portion and one end portion of the second straight pipe portion, the other end portion of the second straight pipe portion, and the third straight pipe A second bent portion for connecting and connecting one end of the portion,
A third bent portion for connecting and connecting the other end of the third straight pipe portion and one end of the fourth straight pipe portion, an expansion pipe joint interposed near the one end portion of the third straight pipe portion, and a second A first support member that supports a lower portion of the straight pipe portion near the one end, a second support member that supports a lower portion of the third straight pipe portion near the one end of the expansion pipe joint, and the other end of the expansion pipe joint. A third support member that supports the lower portion of the third straight pipe portion that is near, and a fourth support member that supports the third bent portion,
A burner attached to the base end portion of the first straight pipe portion, the combustion flame from the burner by the first straight pipe portion to the fourth straight pipe portion, the first bent portion to the third bent portion, and the expansion joint. It is characterized by guiding combustion gas.
【００１４】[0014]
【作用】本発明に従えば、ラジアントチューブは直管部
と、直管部の端部を相互に連結して直管部とともに燃焼
ガスの通路を形成する屈曲部と、直管部の被加熱物を臨
む部分の途中に設けられる伸縮管継手とを含む。このよ
うにラジアントチューブの熱膨張差が大きい炉内で直管
部の被加熱物を臨む部分の途中に伸縮管継手が設けられ
るので、熱膨張に基づく熱応力を確実に吸収緩和するこ
とができる。このためラジアントチューブの寿命が大幅
に延長される。According to the present invention, the radiant tube includes a straight pipe portion, a bent portion that connects the ends of the straight pipe portion to each other to form a combustion gas passage together with the straight pipe portion, and the straight pipe portion to be heated. An expansion joint provided in the middle of a portion facing an object. In this way, since the expansion joint is provided in the middle of the portion of the straight tube facing the object to be heated in the furnace where the difference in thermal expansion of the radiant tube is large, it is possible to reliably absorb and relax the thermal stress due to thermal expansion. . This significantly extends the life of the radiant tube.
【００１５】また本発明に従えば、伸縮管継手は、上下
に配設された複数の直管部のうち最下部の直管部以外の
直管部に設けられ、伸縮管継手が設けてある直管部はそ
れよりも下方の直管部に支持部材を介在して支持され
る。このように伸縮管継手が下方の直管部に設けられた
支持部材によって支持されるので、伸縮管継手に掛る負
荷は大幅に低減され、肉厚が薄くて変形しやすい伸縮管
継手のクリープ変形が確実に防止される。このため伸縮
管継手ひいてはラジアントチューブの寿命が延長され
る。According to the invention, the expansion joint is provided in a straight pipe portion other than the lowermost straight pipe portion of the plurality of straight pipe portions arranged vertically, and the expansion pipe joint is provided. The straight pipe portion is supported by a straight pipe portion below the straight pipe portion with a supporting member interposed therebetween. In this way, since the expansion joint is supported by the support member provided in the lower straight pipe portion, the load on the expansion joint is significantly reduced, and the creep deformation of the expansion joint that is thin and easily deforms Is reliably prevented. For this reason, the life of the expansion joint and thus the radiant tube is extended.
【００１６】また本発明に従えば、支持部材は伸縮管継
手を有する直管部の下部を受け、かつ直管部の軸線方向
に相互に変位可能に支持する下に凸の円弧状の受面を有
する受け部材と、受け部材の下部に上端部が固定され、
下方の直管部の上部に下端部が固定される脚とを含む。
このように受け部材によって直管部が直管部の軸線方向
に相互に変位可能に支持されるので、直管部や伸縮管継
手の熱膨張や熱収縮を妨げることなく直管部や伸縮管継
手のクリープ変形を防止することができる。このため熱
応力を伸縮管継手によって確実に吸収緩和することが可
能となり、ラジアントチューブの寿命が大幅に延長され
る。Further, according to the invention, the support member receives the lower portion of the straight pipe portion having the expansion joint, and supports a downward convex arcuate receiving surface which supports the straight pipe portion so as to be mutually displaceable in the axial direction. A receiving member having, and an upper end portion fixed to the lower part of the receiving member,
A leg having a lower end fixed to the upper part of the lower straight pipe part.
In this way, since the straight pipe portion is supported by the receiving member so as to be displaceable in the axial direction of the straight pipe portion, the straight pipe portion and the flexible pipe joint do not interfere with thermal expansion and contraction of the straight pipe portion and the flexible pipe joint. Creep deformation of the joint can be prevented. Therefore, thermal stress can be reliably absorbed and relaxed by the expansion joint, and the life of the radiant tube is significantly extended.
【００１７】また本発明に従えば、ラジアントチューブ
は上下に間隔をあけて水平に配置される第１直管部〜第
４直管部と、各直管部の端部を連結接続する第１屈曲部
〜第３屈曲部と、第３直管部に設けられる伸縮管継手
と、第２直管部を支持する第１支持部材と、伸縮管継手
の一端部寄りおよび他端部寄りの第３直管部を支持する
第２支持部材および第３支持部材と、第１直管部の基端
部に取付けられるバーナとを含んで構成される。このよ
うに熱膨張差の大きい位置に伸縮管継手が設けられ、伸
縮管継手の両端部が支持部材によって支持されているの
で、熱膨張に基づく熱応力を確実に吸収緩和することが
可能であり、かつ伸縮管継手のクリープ変形を防止する
ことができる。このためラジアントチューブの寿命が大
幅に延長される。またラジアントチューブは上下に間隔
をあけて水平に配置されるので、伸縮管継手が軸直角方
向に変位しても接触によって破損するおそれがない。さ
らに伸縮管継手が支持部材の中間に配設されているの
で、伸縮管継手が第４直管部の基端部に設けられる場合
に比べて支持部材による摺動抵抗が小さくなり、熱応力
を確実に吸収緩和することができる。このためラジアン
トチューブの寿命が延長される。Further, according to the invention, the radiant tube is a first straight pipe portion to a fourth straight pipe portion which are horizontally arranged at intervals in the vertical direction, and a first straight pipe portion for connecting and connecting the end portions of the straight pipe portions. Bending portion to third bending portion, expansion pipe joint provided in the third straight pipe portion, first support member supporting the second straight pipe portion, first end portion of the extension pipe joint, and second end portion of the expansion pipe joint The third straight pipe portion includes a second support member and a third support member, and a burner attached to the base end portion of the first straight pipe portion. Since the expansion joint is provided at a position where the difference in thermal expansion is large, and both ends of the expansion joint are supported by the supporting members, it is possible to surely absorb and relax the thermal stress due to the thermal expansion. In addition, the creep deformation of the expansion joint can be prevented. This significantly extends the life of the radiant tube. Further, since the radiant tube is arranged horizontally with a space above and below it, there is no risk of damage due to contact even if the expansion joint is displaced in the direction perpendicular to the axis. Further, since the expansion joint is arranged in the middle of the support member, the sliding resistance by the support member is smaller than that in the case where the expansion joint is provided at the base end portion of the fourth straight pipe portion, and the thermal stress is reduced. Absorption and relaxation can be ensured. Therefore, the life of the radiant tube is extended.
【００１８】[0018]
【実施例】図１は本発明の一実施例であるＷ型ラジアン
トチューブの簡略化された構成を示す部分断面図であ
り、図２は図１に示すＷ型ラジアントチューブの伸縮管
継手の簡略化された構成を示す部分断面図であり、図３
は図１に示すＷ型ラジアントチューブの支持部材の簡略
化された構成を示す斜視図であり、図４は図３に示す支
持部材の正面図であり、図５は図３に示す支持部材の平
面図であり、図６は図３に示す支持部材の側面図であ
り、図７は図４に示す支持部材の切断面線ＶＩＩ−ＶＩ
Ｉから見た断面図であり、図８はラジアントチューブの
表面温度測定位置を示す説明図であり、図９はラジアン
トチューブの燃焼ガス流れ方向位置と表面温度との関係
を示す特性図である。図１から図９において対応する部
分には同一の参照符号を付す。1 is a partial cross-sectional view showing a simplified structure of a W-shaped radiant tube according to an embodiment of the present invention, and FIG. 2 is a simplified expansion joint for a W-shaped radiant tube shown in FIG. FIG. 3 is a partial cross-sectional view showing a simplified structure, and FIG.
FIG. 4 is a perspective view showing a simplified configuration of a support member for the W-shaped radiant tube shown in FIG. 1, FIG. 4 is a front view of the support member shown in FIG. 3, and FIG. 5 is a view of the support member shown in FIG. FIG. 6 is a plan view, FIG. 6 is a side view of the support member shown in FIG. 3, and FIG. 7 is a section line VII-VI of the support member shown in FIG.
FIG. 8 is a cross-sectional view as seen from I, FIG. 8 is an explanatory view showing a surface temperature measurement position of the radiant tube, and FIG. 9 is a characteristic view showing a relationship between the combustion gas flow direction position of the radiant tube and the surface temperature. 1 to 9, corresponding parts are designated by the same reference numerals.
【００１９】図１に示すように本発明の一実施例である
Ｗ型ラジアントチューブ３２は、同一鉛直面内に軸線を
有し、上下に間隔をあけて水平に配置される上から順に
第１直管部４１、第２直管部４２、第３直管部４３、第
４直管部４４と、前記第１直管部４１の遊端部と前記第
２直管部４２の一端部とを連結接続する第１屈曲部４５
と、前記第２直管部４２の他端部と前記第３直管部４３
の一端部とを連結接続する第２屈曲部４６と、前記第３
直管部４３の他端部と前記第４直管部４４の一端部とを
連結接続する第３屈曲部４７と、前記第３直管部４３の
前記一端部寄りに設けられる伸縮管継手５５と、前記第
２直管部４２の前記一端部寄りの下部を支持する第１支
持部材である第１中間支持台５０ａと、前記伸縮管継手
５５の一端部寄りの前記第３直管部４３下部を支持する
第２支持部材である第２中間支持台５０ｂと、前記伸縮
管継手５５の他端部寄りの前記第３直管部４３下部を支
持する第３支持部材である第３中間支持台５０ｃと、前
記第３屈曲部４７を支持する第４支持部材である先端支
持台５１と、前記第１直管部４１の基端部に取付けられ
るバーナ５２とを含んで構成される。As shown in FIG. 1, a W-shaped radiant tube 32 which is an embodiment of the present invention has an axis in the same vertical plane and is horizontally arranged at intervals in the vertical direction. Straight pipe portion 41, second straight pipe portion 42, third straight pipe portion 43, fourth straight pipe portion 44, a free end portion of the first straight pipe portion 41 and one end portion of the second straight pipe portion 42 First bent portion 45 for connecting and connecting
And the other end of the second straight pipe portion 42 and the third straight pipe portion 43.
The second bent portion 46 for connecting and connecting one end of the
A third bent portion 47 that connects and connects the other end of the straight pipe portion 43 and one end of the fourth straight pipe portion 44, and an expansion pipe joint 55 provided near the one end portion of the third straight pipe portion 43. A first intermediate support base 50a that is a first support member that supports a lower portion of the second straight pipe portion 42 near the one end portion, and the third straight pipe portion 43 near the one end portion of the expansion joint 55. A second intermediate support base 50b that is a second support member that supports the lower portion, and a third intermediate support that is a third support member that supports the lower portion of the third straight pipe portion 43 near the other end of the expansion joint 55. The base 50c, a tip support base 51 that is a fourth support member that supports the third bent portion 47, and a burner 52 that is attached to the base end portion of the first straight pipe portion 41 are configured.
【００２０】前記ラジアントチューブ３２は、前記バー
ナ５２側から前記第１直管部４１、第１屈曲部４５、第
２直管部４２、第２屈曲部４６、第３直管部４３、伸縮
管継手５５、第３屈曲部４７、第４直管部４４の順に配
設され、各端部が溶接によって相互に接合されてＷ型に
形成される。また前記第１直管部４１〜第４直管部４４
の軸線は鉛直に立設されている炉壁５４に対して垂直で
あり、前記各軸線は前述のようにすべて同一鉛直面内に
存在する。前記ラジアントチューブ３２の材質として
は、ＪＩＳＧ５１２２に規定されている耐熱鋼鋳鋼品が
使用される。該耐熱鋼鋳鋼品の使用に際しては、高温の
燃焼ガスと接触する上流側の方に下流側よりも高級鋼が
使用される。たとえば上流側に配設されている前記第１
直管部４１、第１屈曲部４５、第２直管部４２、第２屈
曲部４６に対してはＳＣＨ２２（０．４Ｃ−２０．５Ｎ
ｉ−２５Ｃｒ）が使用され、下流側に配設されている前
記第３直管部４３、第３屈曲部４７、第４直管部４４に
対してはＳＣＨ１３（０．３５Ｃ−１２．５Ｎｉ−２６
Ｃｒ）が使用される。The radiant tube 32 includes the first straight pipe portion 41, the first bent portion 45, the second straight pipe portion 42, the second bent portion 46, the third straight pipe portion 43, and the expandable pipe from the side of the burner 52. The joint 55, the third bent portion 47, and the fourth straight pipe portion 44 are arranged in this order, and the respective end portions are joined to each other by welding to form a W shape. In addition, the first straight pipe portion 41 to the fourth straight pipe portion 44
The axis line of is vertical to the furnace wall 54 which is erected vertically, and each axis line exists in the same vertical plane as described above. As the material of the radiant tube 32, a heat-resistant cast steel product specified in JIS G5122 is used. When the cast heat-resistant steel product is used, high-grade steel is used on the upstream side in contact with the high-temperature combustion gas rather than on the downstream side. For example, the first device disposed on the upstream side
For the straight pipe portion 41, the first bent portion 45, the second straight pipe portion 42, and the second bent portion 46, SCH22 (0.4C-20.5N
i-25Cr) is used, and for the third straight pipe portion 43, the third bent portion 47, and the fourth straight pipe portion 44 arranged on the downstream side, SCH13 (0.35C-12.5Ni-). 26
Cr) is used.
【００２１】前記第１直管部４１の基端部には、バーナ
側フランジ４８が設けられており、該バーナ側フランジ
４８は炉の鉄皮５３にボルトまたは溶接によって固定さ
れている。また該バーナ側フランジ４８には、バーナ５
２が設けられており、燃料を前記第１直管部４１の内部
で燃焼させる。前記第４直管部４４の基端部には、排ガ
ス側フランジ４９が設けられており、該排ガス側フラン
ジ４９は前記鉄皮５３にボルトまたは溶接によって固定
されている。また該排ガス側フランジ４９には、排ガス
排出管５６が設けられており、燃焼ガスを外部に排出さ
せる。A burner side flange 48 is provided at the base end portion of the first straight pipe portion 41, and the burner side flange 48 is fixed to the iron shell 53 of the furnace by bolts or welding. Further, the burner 5 is attached to the burner side flange 48.
2 is provided and burns fuel inside the first straight pipe portion 41. An exhaust gas side flange 49 is provided at the base end of the fourth straight pipe portion 44, and the exhaust gas side flange 49 is fixed to the iron shell 53 by bolts or welding. Further, the exhaust gas side flange 49 is provided with an exhaust gas discharge pipe 56 for discharging combustion gas to the outside.
【００２２】前記バーナ５２の噴射ノズル５２ａからの
燃焼炎や燃焼ガスは、前記Ｗ型に形成された通路を通過
し、その過程でラジアントチューブ３２を加熱し、被加
熱物である冷間圧延鋼帯を輻射熱によって間接加熱す
る。加熱中における前記ラジアントチューブ３２の表面
温度は、燃焼ガスの流れ方向位置によって異なる。Combustion flames and combustion gases from the injection nozzle 52a of the burner 52 pass through the W-shaped passage and heat the radiant tube 32 in the process, and cold-rolled steel which is the object to be heated. The belt is indirectly heated by radiant heat. The surface temperature of the radiant tube 32 during heating differs depending on the position of the combustion gas in the flow direction.
【００２３】図８には、加熱中における前記ラジアント
チューブ３２の表面温度の測定位置（Ａ〜Ｆ）を示して
おり、図９には加熱中におけるラジアントチューブ３２
の燃焼ガス流れ方向位置と表面温度との関係を示す。加
熱は無酸化雰囲気中で行われ、雰囲気ガス組成は３％Ｈ
2−Ｎ2である。図９から燃焼ガスが前記ラジアントチュ
ーブ３２内を通る過程において熱が冷間圧延鋼帯に吸熱
されるので、前記ラジアントチューブ３２の表面温度が
しだいに低下していることが判る。また図９より燃焼ガ
ス流れ方向の最上流側である前記第１直管部４１と最下
流側である前記第４直管部４４との表面温度を比較する
と約１００℃の温度差を生じていることが判る。前述の
ように、前記ラジアントチューブ３２はバーナ側と排ガ
ス側の両端が前記炉の鉄皮５３に固定されているので、
前記温度差のため、該ラジアントチューブ３２のバーナ
側と排ガス側の伸縮に差異が生じ、軸線方向に熱応力が
発生する。また前記ラジアントチューブ３２の軸直角断
面では、鉛直方向の上面側が下面側に比べて温度が高い
ので、軸線直角方向においても熱応力が発生する。FIG. 8 shows the measurement positions (A to F) of the surface temperature of the radiant tube 32 during heating, and FIG. 9 shows the radiant tube 32 during heating.
The relationship between the combustion gas flow direction position and the surface temperature is shown. The heating is performed in a non-oxidizing atmosphere, and the atmosphere gas composition is 3% H.
It is a 2 -N 2. It can be seen from FIG. 9 that heat is absorbed by the cold-rolled steel strip in the process of the combustion gas passing through the inside of the radiant tube 32, so that the surface temperature of the radiant tube 32 gradually decreases. Further, comparing the surface temperatures of the first straight pipe portion 41, which is the most upstream side in the combustion gas flow direction, and the fourth straight pipe portion 44, which is the most downstream side, from FIG. 9, a temperature difference of about 100 ° C. is generated. It is understood that there is. As described above, since the radiant tube 32 has both ends on the burner side and the exhaust gas side fixed to the iron shell 53 of the furnace,
Due to the temperature difference, expansion and contraction between the burner side and the exhaust gas side of the radiant tube 32 is different, and thermal stress is generated in the axial direction. Further, in the cross section perpendicular to the axis of the radiant tube 32, the temperature is higher on the upper surface side in the vertical direction than on the lower surface side, so that thermal stress is also generated in the direction perpendicular to the axis line.
【００２４】前記ラジアントチューブ３２の直管部に
は、前記伸縮管継手５５が冷間圧延鋼帯を臨む位置に設
けられる。前記伸縮管継手５５の設置位置は、燃焼ガス
流れ方向の上流側であるバーナ側に設ければ高温のため
前記伸縮管継手５５の寿命が短くなり、一方燃焼ガス流
れ方向の下流側である排ガス側に設ければ低温で熱膨張
差が小さくなるので、熱応力の吸収緩和効果が小さくな
る。このため前記伸縮管継手５５は、図９におけるラジ
アントチューブ３２の表面温度の中間温度領域である前
記第３直管部４３に設けるのが好ましい。なお前記伸縮
管継手５５は後述のように両端を支持する必要があるの
で、最下部に設けられている前記第４直管部４４には配
設を回避することが好ましい。The expansion pipe joint 55 is provided at the straight pipe portion of the radiant tube 32 at a position facing the cold rolled steel strip. If the expansion pipe joint 55 is installed on the burner side, which is the upstream side in the combustion gas flow direction, the life of the expansion pipe joint 55 is shortened because of the high temperature, while the exhaust gas that is the downstream side in the combustion gas flow direction is reduced. If it is provided on the side, the difference in thermal expansion becomes small at low temperature, and the effect of absorbing and relaxing thermal stress becomes small. Therefore, it is preferable that the expansion joint 55 is provided in the third straight pipe portion 43 which is an intermediate temperature region of the surface temperature of the radiant tube 32 in FIG. Since it is necessary to support both ends of the expansion pipe joint 55 as described later, it is preferable to avoid disposing the expansion pipe joint 55 in the fourth straight pipe portion 44 provided at the lowermost portion.
【００２５】図２に示すように、前記伸縮管継手５５
は、ベローズ５７と端管５８とを含んで構成される。該
ベローズ５７は薄肉の波型状伸縮管であり、その波形部
は該ベローズ５７の軸線に対して垂直に形成されてい
る。該ベローズ５７は、ラジアントチューブ３２に発生
する熱応力による軸線方向変位および軸線直角方向変位
を弾性変形によって吸収する。該ベローズ５７の材質
は、たとえばニッケル基合金であり、その寸法は、たと
えば肉厚１．６ｍｍ、外径２８３ｍｍ、内径１９３ｍ
ｍ、長さ２４０ｍｍである。該ベローズ５７は、ばね定
数を調整するため熱処理、たとえば加熱温度１２００℃
の真空熱処理が施される。また該ベローズ５７の弾性変
形可能な許容変位量は、たとえば軸線方向で２０ｍｍ、
軸線直角方向で１５ｍｍである。該ベローズ５７の両端
部は端管５８に溶接によって接合される。該端管５８の
材質は前記ＳＣＨ２２であり、その寸法は、たとえば肉
厚８．５ｍｍ、外径１９４ｍｍ、内径１７７ｍｍ、長さ
８０ｍｍである。該端管５８は端部を前記ラジアントチ
ューブ３２の直管部、たとえば前記第３直管部４３に溶
接によって接合される。該ベローズ５７と該端管５８と
該第３直管部４３とは、共通の同一軸線を有する。As shown in FIG. 2, the expansion pipe joint 55 is provided.
Includes a bellows 57 and an end tube 58. The bellows 57 is a thin corrugated expandable tube, and its corrugated portion is formed perpendicular to the axis of the bellows 57. The bellows 57 absorbs axial displacement and axial orthogonal displacement due to thermal stress generated in the radiant tube 32 by elastic deformation. The material of the bellows 57 is, for example, a nickel-based alloy, and its dimensions are, for example, a wall thickness of 1.6 mm, an outer diameter of 283 mm, and an inner diameter of 193 m.
m and length 240 mm. The bellows 57 is heat-treated to adjust the spring constant, for example, a heating temperature of 1200 ° C.
Vacuum heat treatment is performed. Further, the elastically deformable allowable displacement amount of the bellows 57 is, for example, 20 mm in the axial direction,
It is 15 mm in the direction perpendicular to the axis. Both ends of the bellows 57 are joined to the end tube 58 by welding. The material of the end tube 58 is the SCH22, and the dimensions thereof are, for example, a wall thickness of 8.5 mm, an outer diameter of 194 mm, an inner diameter of 177 mm, and a length of 80 mm. The end of the end pipe 58 is joined to the straight pipe portion of the radiant tube 32, for example, the third straight pipe portion 43 by welding. The bellows 57, the end pipe 58, and the third straight pipe portion 43 have the same common axis.
【００２６】前述のように前記伸縮管継手５５は前記ラ
ジアントチューブ３２の熱膨張差が大きい炉内で冷間圧
延鋼帯を臨む位置、たとえば前記第３直管部４３に設け
られるので、熱膨張に基づく熱応力を確実に吸収緩和す
ることができる。また前記伸縮管継手５５が炉壁５４内
に設けられる場合と比べて、前記伸縮管継手５５の温度
は高くなるけれども、熱応力が確実に吸収緩和されるの
で、ラジアントチューブ３２の寿命は総合的には大幅に
延長される。さらに前記伸縮管継手５５が配設されてい
る前記第３直管部４３は上下の直管部と間隔をあけて配
置されているので、前記ベローズ５７が軸線直角方向に
変位しても接触によって破損するおそれがない。As described above, the expansion pipe joint 55 is provided at a position facing the cold-rolled steel strip in the furnace where the difference in thermal expansion of the radiant tube 32 is large, for example, at the third straight pipe portion 43, so that the thermal expansion is caused. It is possible to surely absorb and relax the thermal stress due to. Although the temperature of the expansion pipe joint 55 is higher than that in the case where the expansion pipe joint 55 is provided in the furnace wall 54, the thermal stress is reliably absorbed and relaxed, so that the radiant tube 32 has a long life. Will be greatly extended. Further, since the third straight pipe part 43, in which the expansion pipe joint 55 is arranged, is arranged with a space from the upper and lower straight pipe parts, even if the bellows 57 is displaced in the direction perpendicular to the axis, contact is made by contact. There is no risk of damage.
【００２７】前記伸縮管継手５５が配設されている前記
第３直管部４３は、それより下方の前記第４直管部４４
に設けられる前記第２中間支持台５０ｂおよび第３中間
支持台５０ｃによって前記伸縮管継手５５の一端部寄り
および他端部寄りをそれぞれ支持される。図３〜図７に
示すように前記第２中間支持台５０ｂは、受け部材であ
る湾曲受け台５９と鉛直に立設される４本の脚６０と、
４本の補強リブ６１とを含んで構成される。前記湾曲受
け台５９は直管部の軸線に垂直な平面内で下に凸の円弧
状の受面を有する。前記脚６０の上端部は、前記湾曲受
け台５９の下部に溶接によって接合されており、前記補
強リブ６１は前記脚６０と前記湾曲受け台５９の下部に
溶接によって接合されている。該湾曲受け台５９、脚６
０、補強リブ６１の材質はすべて前記ＪＩＳ耐熱鋼ＳＣ
Ｈ１３である。前記脚６０の下端部は、前記ラジアント
チューブ３２の直管部、たとえば前記第３直管部４３を
臨む前記第４直管部４４の外周面上に溶接によって接合
されている。一方前記湾曲受け台５９の上部は、前記ラ
ジアントチューブ３２の直管部、たとえば前記伸縮管継
手５５の一端部寄りの前記第３直管部４３の下部に当接
して支持できるように配設される。この当接面は固定さ
れないので、熱膨張または熱収縮に応じて前記第３直管
部４３の軸線方向に相互に摺動変位することができる。
前記第３中間支持台５０ｃは前記第２中間支持台５０ｂ
と全く同一の構成を有している。また両者の軸線方向位
置は前記第３直管部４３の一端部寄りに設置される。The third straight pipe portion 43, in which the expansion joint 55 is arranged, is located below the fourth straight pipe portion 44.
The second intermediate support base 50b and the third intermediate support base 50c, which are provided in the above, respectively, support one end and the other end of the expansion pipe joint 55, respectively. As shown in FIGS. 3 to 7, the second intermediate support base 50b includes a curved support base 59 that is a receiving member, four legs 60 that are vertically erected,
It is configured to include four reinforcing ribs 61. The curved pedestal 59 has a downwardly convex arcuate receiving surface in a plane perpendicular to the axis of the straight pipe portion. The upper ends of the legs 60 are joined to the lower portion of the curved pedestal 59 by welding, and the reinforcing ribs 61 are joined to the lower portions of the leg 60 and the curved pedestal 59 by welding. The curved pedestal 59 and legs 6
0, the material of the reinforcing rib 61 is all JIS heat resistant steel SC
It is H13. The lower end portion of the leg 60 is joined by welding to a straight pipe portion of the radiant tube 32, for example, an outer peripheral surface of the fourth straight pipe portion 44 facing the third straight pipe portion 43. On the other hand, the upper portion of the curved pedestal 59 is disposed so as to contact and support the straight pipe portion of the radiant tube 32, for example, the lower portion of the third straight pipe portion 43 near one end of the expansion joint 55. It Since this contact surface is not fixed, it can be slidably displaced in the axial direction of the third straight pipe portion 43 in response to thermal expansion or thermal contraction.
The third intermediate support base 50c is the second intermediate support base 50b.
It has exactly the same configuration as. The positions of the both in the axial direction are installed near one end of the third straight pipe portion 43.
【００２８】前述のように前記伸縮管継手５５の一端部
寄りおよび他端部寄りの前記第３直管部４３には、前記
第２および第３中間支持台５０ｂ，５０ｃが配設されて
いるので、前記伸縮管継手５５に掛る負荷は大幅に低減
される。このため肉厚が薄くて変形しやすい前記伸縮管
継手５５のクリープ変形が確実に防止される。また前記
第２および第３中間支持台５０ｂ，５０ｃの軸線方向位
置が前記第３屈曲部４７からできるだけ離れた前記第３
直管部４３の一端部寄りに設置されているので、前記第
２および第３中間支持台５０ｂ，５０ｃは前記ラジアン
トチューブ３２のクリープ変形を確実に防止することが
できる。As described above, the second and third intermediate support bases 50b and 50c are disposed on the third straight pipe portion 43 near the one end and the other end of the expansion joint 55. Therefore, the load applied to the expansion joint 55 is significantly reduced. Therefore, the creep deformation of the expansion joint 55, which is thin and easily deformed, is reliably prevented. Further, the axial positions of the second and third intermediate support bases 50b and 50c are separated from the third bent portion 47 as much as possible.
Since it is installed near the one end of the straight pipe portion 43, the second and third intermediate support bases 50b and 50c can surely prevent the creep deformation of the radiant tube 32.
【００２９】前記第１中間支持台５０ａは、前記第２お
よび第３中間支持台５０ｂ，５０ｃと全く同一の構成を
有しており、前記第２直管部４２を臨む前記第３直管部
４３の外周面上に溶接によって接合されている。また前
記第１中間支持台５０ａの軸線方向位置は第２屈曲部４
６からできるだけ離れた前記第３直管部４３の他端部寄
りの位置に設置されている。The first intermediate support base 50a has exactly the same structure as the second and third intermediate support bases 50b and 50c, and faces the second straight pipe portion 42. It is joined to the outer peripheral surface of 43 by welding. The position of the first intermediate support base 50a in the axial direction is set to the second bent portion 4a.
It is installed at a position near the other end of the third straight pipe portion 43 as far as possible from 6.
【００３０】前記先端支持台５１は、前記第３屈曲部４
７の炉壁５４ａを臨む先端部外周面上に設けられてい
る。前記炉壁５４ａは前記ラジアントチューブ３２の遊
端部側に前記炉壁５４と向かい合って立設されている。
該先端支持台５１は、該炉壁５４ａに設けられている受
け台５１ａ上に載置される。これによって前記ラジアン
トチューブ３２の先端部が支持されるので、前記ラジア
ントチューブ３２の自重によるクリープ変形を防止する
ことができる。また該先端支持台５１と該受け台５１ａ
とは固定されていないので、前記ラジアントチューブ３
２の熱膨張または熱収縮に応じて摺動変位することがで
きる。The tip support base 51 includes the third bent portion 4
No. 7 is provided on the outer peripheral surface of the front end of the furnace wall 54a. The furnace wall 54a is erected on the free end side of the radiant tube 32 so as to face the furnace wall 54.
The tip support base 51 is placed on a receiving base 51a provided on the furnace wall 54a. As a result, the tip portion of the radiant tube 32 is supported, so that creep deformation due to the weight of the radiant tube 32 can be prevented. Further, the tip support base 51 and the receiving base 51a
Is not fixed, so the radiant tube 3
It can be slidably displaced according to the thermal expansion or thermal contraction of 2.
【００３１】なお、前述のように、前記伸縮管継手５５
は摺動抵抗を有する前記第１〜第３中間支持台５０ａ，
５０ｂ，５０ｃならびに先端支持台５１の中間に設けら
れているので、前記伸縮管継手５５がそれらよりも燃焼
ガス流れ方向下流側に設けられる場合に比べて摺動抵抗
が小さくなり、熱応力を確実に吸収緩和することができ
る。As described above, the expansion pipe joint 55 is
Is the first to third intermediate supports 50a having sliding resistance,
Since it is provided in the middle of 50b, 50c and the tip support base 51, the sliding resistance is smaller than that in the case where the expansion joint 55 is provided downstream of them in the combustion gas flow direction, and thermal stress is ensured. Can be absorbed and relaxed.
【００３２】図１０は本発明のラジアントチューブを好
適に適用することができる縦型連続焼鈍設備の簡略化さ
れた構成を示す全体図であり、図１１は図１０における
縦型連続焼鈍設備の加熱帯の簡略化された構成を示す断
面図である。FIG. 10 is an overall view showing a simplified structure of a vertical continuous annealing equipment to which the radiant tube of the present invention can be preferably applied, and FIG. 11 is a schematic view of the vertical continuous annealing equipment in FIG. It is sectional drawing which shows the simplified structure of a tropical zone.
【００３３】図１０に示すように縦型連続焼鈍設備は、
ペイオフリール３０と、電解脱脂装置２８と、入側ルー
パ３３と、加熱帯２２と、均熱帯２３と、１次冷却帯２
４と、過時効帯２５と、２次冷却帯２６と、出側ルーパ
３４と、調質圧延機２９と、巻取りリール３１とを含ん
で構成される。冷間圧延鋼帯２１は、ペイオフリール３
０から払い出され、電解脱脂装置２８で油分や汚れを除
去された後、入側ルーパ３３を経て加熱帯２２で所定温
度たとえば７００℃に加熱され、均熱帯で均熱保持され
て軟化焼鈍される。その後、１次冷却帯２４で１次冷却
され、過時効帯２５で過時効処理が行われ、２次冷却帯
２６で２次冷却された後、出側ルーパ３４、調質圧延機
２９を経て巻取りリール３１で巻取られる。前記加熱帯
２２から前記２次冷却帯２６までの各処理帯には、前記
冷間圧延鋼帯２１を搬送するための多数のハースロール
２７が上下に配設されている。図１１に示すように前記
加熱帯２２の内部には輻射熱管の一種であるラジアント
チューブ３２が上流側から下流側に鉛直方向に複数個配
設されていて、該ラジアントチューブ３２の列間には前
記冷間圧延鋼帯２１が３％Ｈ2−Ｎ2に調製された無酸化
雰囲気中を鉛直方向に通板されている。該冷間圧延鋼帯
２１の加熱は、前記ラジアントチューブ３２内で燃料を
前記バーナ５２で燃焼させて該ラジアントチューブ３２
を加熱し、その輻射熱によって行われる。As shown in FIG. 10, the vertical continuous annealing equipment is
Payoff reel 30, electrolytic degreasing device 28, entry side looper 33, heating zone 22, soaking zone 23, primary cooling zone 2
4, the overaging zone 25, the secondary cooling zone 26, the exit side looper 34, the temper rolling mill 29, and the take-up reel 31. Cold rolled steel strip 21 is a payoff reel 3
After being discharged from 0, oil and dirt are removed by the electrolytic degreasing device 28, it is heated to a predetermined temperature, for example, 700 ° C. in the heating zone 22 through the entrance looper 33, and is soaked and held in soaking to be softened and annealed. It After that, primary cooling is performed in the primary cooling zone 24, overaging treatment is performed in the overaging zone 25, and secondary cooling is performed in the secondary cooling zone 26, and then the exit side looper 34 and the temper rolling mill 29 are passed. It is wound by the take-up reel 31. In each processing zone from the heating zone 22 to the secondary cooling zone 26, a large number of hearth rolls 27 for conveying the cold-rolled steel strip 21 are vertically arranged. As shown in FIG. 11, a plurality of radiant tubes 32, which is a type of radiant heat tube, are vertically arranged in the heating zone 22 from the upstream side to the downstream side, and between the rows of the radiant tubes 32. The cold-rolled steel strip 21 is vertically stripped in a non-oxidizing atmosphere adjusted to 3% H 2 —N 2 . The cold-rolled steel strip 21 is heated by burning fuel in the radiant tube 32 by the burner 52.
Is heated by radiant heat.
【００３４】本発明の一実施例である図１に示すラジア
ントチューブ３２を、図１１に示す縦型連続焼鈍設備の
加熱帯２２に設置し、同一位置に設置した図１２に示す
従来型のラジアントチューブ１８と耐久性の比較を行っ
た。その結果、表１に示すごとく、およそ２倍の寿命延
長が可能となった。The radiant tube 32 shown in FIG. 1, which is an embodiment of the present invention, is installed in the heating zone 22 of the vertical continuous annealing equipment shown in FIG. 11 and is installed at the same position as the conventional radiant tube shown in FIG. The tube 18 and the durability were compared. As a result, as shown in Table 1, it has become possible to extend the life by about twice.
【００３５】[0035]
【表１】 [Table 1]
【００３６】[0036]
【発明の効果】以上のように本発明によれば、ラジアン
トチューブは直管部と、屈曲部と、直管部の被加熱物を
臨む部分に設けられる伸縮管継手とを含む。このように
ラジアントチューブの熱膨張差が大きい炉内で直管部の
被加熱物を臨む部分に伸縮管継手が設けられるので、熱
膨張による熱応力を確実に吸収緩和することができる。
このため、ラジアントチューブの寿命が大幅に延長さ
れ、加熱炉の稼働率向上ならびに、ラジアントチューブ
取換作業回数の低減を図ることができる。また本発明に
よるラジアントチューブは構造が簡単であるので、既設
炉体の改造を必要とせず、既設炉において容易に実施す
ることができる。As described above, according to the present invention, the radiant tube includes the straight pipe portion, the bent portion, and the expansion pipe joint provided in the portion of the straight pipe portion facing the object to be heated. In this way, since the expansion joint is provided in the portion of the straight tube portion facing the object to be heated in the furnace in which the difference in thermal expansion of the radiant tube is large, it is possible to reliably absorb and relax the thermal stress due to thermal expansion.
Therefore, the life of the radiant tube is significantly extended, the operating rate of the heating furnace can be improved, and the number of radiant tube replacement operations can be reduced. Further, since the radiant tube according to the present invention has a simple structure, it can be easily implemented in an existing furnace without the need to modify the existing furnace body.
【００３７】また本発明によれば、伸縮管継手は下方の
直管部に設けられる支持部材によって支持される。これ
によって、伸縮管継手に掛る負荷は大幅に低減されるの
で、肉厚が薄くて変形しやすい伸縮管継手のクリープ変
形が確実に防止される。このため伸縮管継手ひいてはラ
ジアントチューブの寿命が延長される。Further, according to the present invention, the expansion joint is supported by the supporting member provided in the lower straight pipe portion. As a result, the load applied to the expansion joint is greatly reduced, and thus the creep deformation of the expansion joint, which is thin and easily deformed, is reliably prevented. For this reason, the life of the expansion joint and thus the radiant tube is extended.
【００３８】また本発明によれば、支持部材は摺動可能
に直管部の下部を支持する下に凸の円弧状の受面を有す
る受け部材と、受け部材の下部に上端部が固定され、下
方の直管部の上部に下端部が固定される脚とを含む。こ
のように受け部材によって直管部が摺動可能に支持され
るので、直管部や伸縮管継手の熱膨張や熱収縮を妨げる
ことなく、直管部や伸縮管継手のクリープ変形を防止す
ることができる。このため熱応力を伸縮管継手によって
確実に吸収緩和することが可能となり、ラジアントチュ
ーブの寿命が大幅に延長される。また受け部材が円弧状
の受面を有しているので、直管部を確実に当接支持する
ことができる。Further, according to the present invention, the support member slidably supports the lower portion of the straight pipe portion and has a downwardly convex arcuate receiving surface, and the upper end portion is fixed to the lower portion of the receiving member. , A leg whose lower end is fixed to the upper part of the lower straight pipe part. Since the straight pipe portion is slidably supported by the receiving member in this manner, creep deformation of the straight pipe portion and the expansion joint is prevented without hindering thermal expansion and contraction of the straight pipe portion and the expansion joint. be able to. Therefore, thermal stress can be reliably absorbed and relaxed by the expansion joint, and the life of the radiant tube is significantly extended. Further, since the receiving member has the arcuate receiving surface, the straight pipe portion can be reliably contacted and supported.
【００３９】また本発明によれば、ラジアントチューブ
は上下に間隔をあけて水平に配置される第１直管部〜第
４直管部と、各直管部の端部を連結接続する第１屈曲部
〜第３屈曲部と、第３直管部に設けられる伸縮管継手
と、第２直管部を支持する第１支持部材と、伸縮管継手
の一端部寄りおよび他端部寄りの第３直管部を支持する
第２支持部材および第３支持部材と、第１直管部の基端
部に取付けられるバーナとを含んで構成される。このよ
うに熱膨張差の大きい位置に伸縮管継手が設けられ、伸
縮管継手の両端部が支持部材によって支持されているの
で、熱膨張に基づく熱応力を確実に吸収緩和することが
可能であり、かつ伸縮管継手のクリープ変形を防止する
ことができる。このためラジアントチューブの寿命が大
幅に延長される。またラジアントチューブは上下に間隔
をあけて水平に配置されるので、伸縮管継手が軸直角方
向に変位しても接触によって破損するおそれがない。さ
らに伸縮管継手が支持部材の中間に配設されているの
で、伸縮管継手が第４直管部の基端部に設けられる場合
に比べて支持部材による摺動抵抗が小さくなり、熱応力
を確実に吸収緩和することができる。このためラジアン
トチューブの寿命が延長される。Further, according to the present invention, the radiant tube is a first straight pipe portion to a fourth straight pipe portion which are horizontally arranged at intervals in the vertical direction and a first straight pipe portion which connects and connects the end portions of the respective straight pipe portions. Bending portion to third bending portion, expansion pipe joint provided in the third straight pipe portion, first support member supporting the second straight pipe portion, first end portion of the extension pipe joint, and second end portion of the expansion pipe joint The third straight pipe portion includes a second support member and a third support member, and a burner attached to the base end portion of the first straight pipe portion. Since the expansion joint is provided at a position where the difference in thermal expansion is large, and both ends of the expansion joint are supported by the supporting members, it is possible to surely absorb and relax the thermal stress due to the thermal expansion. In addition, the creep deformation of the expansion joint can be prevented. This significantly extends the life of the radiant tube. Further, since the radiant tube is arranged horizontally with a space above and below it, there is no risk of damage due to contact even if the expansion joint is displaced in the direction perpendicular to the axis. Further, since the expansion joint is arranged in the middle of the support member, the sliding resistance by the support member is smaller than that in the case where the expansion joint is provided at the base end portion of the fourth straight pipe portion, and the thermal stress is reduced. Absorption and relaxation can be ensured. Therefore, the life of the radiant tube is extended.
【図１】本発明の一実施例であるＷ型ラジアントチュー
ブの簡略化された構成を示す部分断面図である。FIG. 1 is a partial cross-sectional view showing a simplified configuration of a W-shaped radiant tube which is an embodiment of the present invention.
【図２】図１に示すＷ型ラジアントチューブの伸縮管継
手の簡略化された構成を示す部分断面図である。FIG. 2 is a partial cross-sectional view showing a simplified configuration of an expansion joint of the W-shaped radiant tube shown in FIG.
【図３】図１に示すＷ型ラジアントチューブの支持部材
の簡略化された構成を示す斜視図である。3 is a perspective view showing a simplified configuration of a supporting member of the W-shaped radiant tube shown in FIG. 1. FIG.
【図４】図３に示す支持部材の正面図である。FIG. 4 is a front view of the support member shown in FIG.
【図５】図３に示す支持部材の平面図である。5 is a plan view of the support member shown in FIG.
【図６】図３に示す支持部材の側面図である。FIG. 6 is a side view of the support member shown in FIG.
【図７】図４に示す支持部材の切断面線ＶＩＩ−ＶＩＩ
から見た断面図である。FIG. 7 is a section line VII-VII of the supporting member shown in FIG.
It is sectional drawing seen from.
【図８】ラジアントチューブの表面温度測定位置を示す
説明図である。FIG. 8 is an explanatory view showing a surface temperature measurement position of a radiant tube.
【図９】ラジアントチューブの燃焼ガス流れ方向位置と
表面温度との関係を示す特性図である。FIG. 9 is a characteristic diagram showing a relationship between a combustion gas flow direction position of a radiant tube and a surface temperature.
【図１０】本発明のラジアントチューブを好適に適用す
ることができる縦型連続焼鈍設備の簡略化された構成を
示す全体図である。FIG. 10 is an overall view showing a simplified configuration of vertical continuous annealing equipment to which the radiant tube of the present invention can be suitably applied.
【図１１】図１０に示す縦型連続焼鈍設備の加熱帯の簡
略化された構成を示す断面図である。11 is a cross-sectional view showing a simplified configuration of a heating zone of the vertical continuous annealing equipment shown in FIG.
【図１２】従来型のＷ型ラジアントチューブの簡略化さ
れた構成を示す部分断面図である。FIG. 12 is a partial cross-sectional view showing a simplified configuration of a conventional W-type radiant tube.
【図１３】先行技術のＷ型ラジアントチューブの簡略化
された構成を示す部分断面図である。FIG. 13 is a partial cross-sectional view showing a simplified configuration of a prior art W-shaped radiant tube.
１，４１ 第１直管部 ２，４２ 第２直管部 ３，４３ 第３直管部 ４，４４ 第４直管部 ５，４５ 第１屈曲部 ６，４６ 第２屈曲部 ７，４７ 第３屈曲部 ８，４８ バーナ側フランジ ９，４９ 排ガス側フランジ １０ａ，１０ｂ 中間支持台 １１，５１ 先端支持台 １１ａ，５１ａ 受け台 １２，５２ バーナ １３，５３ 鉄皮 １４，１４ａ，５４，５４ａ 炉壁 １５，５５ 伸縮管継手 １６ 支持円筒 １７，５６ 排ガス排出管 １８，１９，３２ ラジアントチューブ ２１ 冷間圧延鋼帯 ２２ 加熱帯 ２３ 均熱帯 ２７ ハースロール ５０ａ 第１中間支持台 ５０ｂ 第２中間支持台 ５０ｃ 第３中間支持台 ５７ ベローズ ５８ 端管 1,41 1st straight pipe part 2,42 2nd straight pipe part 3,43 3rd straight pipe part 4,44 4th straight pipe part 5,45 1st bending part 6,46 2nd bending part 7,47 3 Bending part 8,48 Burner side flange 9,49 Exhaust gas side flange 10a, 10b Intermediate support stand 11,51 Tip support stand 11a, 51a Receiving stand 12,52 Burner 13,53 Iron shell 14,14a, 54,54a Furnace wall 15,55 Expansion joint 16 Support cylinder 17,56 Exhaust gas exhaust pipe 18,19,32 Radiant tube 21 Cold rolled steel strip 22 Heating zone 23 Soaking zone 27 Heart roll 50a 1st intermediate support 50b 2nd intermediate support 50c Third intermediate support base 57 Bellows 58 End pipe
Claims (4)
ぞれ有する直管部と、 直管部の端部を相互に連結して単一の燃焼炎または燃焼
ガスの通路を直管部とともに形成する屈曲部と、 直管部の被加熱物に臨む部分の途中に設けられ、直管部
の軸線方向および軸線直角方向に伸縮可能な伸縮管継手
とを含むことを特徴とするラジアントチューブ。1. A straight pipe portion arranged vertically and having substantially horizontal axes, and an end portion of the straight pipe portion is interconnected to form a single combustion flame or combustion gas passage together with the straight pipe portion. A radiant tube comprising: a bent portion and a flexible tube joint that is provided in the middle of a portion of the straight pipe portion that faces the object to be heated and that is capable of expanding and contracting in the axial direction and the direction perpendicular to the axial line of the straight pipe portion.
数の直管部のうち最下部の直管部以外の直管部に設けら
れ、 伸縮管継手が設けてある直管部は、それよりも下方の直
管部に支持部材を介在して支持されることを特徴とする
請求項１記載のラジアントチューブ。2. The expansion joint is provided in a straight pipe portion other than the lowest straight pipe portion of the plurality of straight pipe portions arranged vertically, and the straight pipe portion provided with the expansion pipe joint is The radiant tube according to claim 1, wherein the radiant tube is supported below the straight tube portion with a support member interposed.
の下部を受け、かつ直管部の軸線方向に相互に変位可能
に支持する直管部の軸線に垂直な平面内で下に凸の円弧
状の受面を有する受け部材と、 受け部材の下部に上端部が固定され伸縮管継手が介在さ
れる直管部よりも下方の直管部の上部に下端部が固定さ
れる脚とを有することを特徴とする請求項１記載のラジ
アントチューブ。3. The support member receives the lower portion of the straight pipe portion having the expansion joint and supports the straight pipe portion downwardly in a plane perpendicular to the axis of the straight pipe portion, which supports the straight pipe portion so as to be mutually displaceable in the axial direction. A receiving member having a convex arcuate receiving surface, and a leg whose lower end is fixed to the upper part of the straight pipe part below the straight pipe part where the upper end part is fixed to the lower part of the receiving member and the expansion joint is interposed. The radiant tube according to claim 1, further comprising:
けて水平に配置される上から順に第１直管部〜第４直管
部と、 第１直管部の遊端部と第２直管部の一端部とを連結接続
する第１屈曲部と、 第２直管部の他端部と第３直管部の一端部とを連結接続
する第２屈曲部と、 第３直管部の他端部と第４直管部の一端部とを連結接続
する第３屈曲部と、 第３直管部の前記一端部寄りに介在される伸縮管継手
と、 第２直管部の前記一端部寄りの下部を支持する第１支持
部材と、 伸縮管継手の一端部寄りの前記第３直管部下部を支持す
る第２支持部材と、 伸縮管継手の他端部寄りの前記第３直管部下部を支持す
る第３支持部材と、 第３屈曲部を支持する第４支持部材と、 第１直管部の基端部に取付けられるバーナとを含み、 第１直管部〜第４直管部と第１屈曲部〜第３屈曲部と伸
縮管継手とによってバーナからの燃焼炎または燃焼ガス
を導くことを特徴とする請求項１〜３いずれかに記載の
ラジアントチューブ。4. A first straight pipe portion to a fourth straight pipe portion, which have an axis in a vertical plane and are horizontally arranged at intervals in the vertical direction, and a free end portion of the first straight pipe portion. A first bent portion connecting and connecting one end portion of the second straight pipe portion and a second bent portion connecting and connecting the other end portion of the second straight pipe portion and one end portion of the third straight pipe portion, A third bent portion that connects and connects the other end of the third straight pipe portion and one end of the fourth straight pipe portion, an expansion pipe joint interposed near the one end portion of the third straight pipe portion, and a second straight pipe A first support member that supports a lower portion of the pipe portion near the one end portion, a second support member that supports a lower portion of the third straight pipe portion near the one end portion of the expansion pipe joint, and a second end portion of the expansion pipe joint A third supporting member for supporting the lower portion of the third straight pipe portion, a fourth supporting member for supporting the third bent portion, and a burner attached to the base end portion of the first straight pipe portion. Pipe-fourth straight pipe When radiant tube according to claim 1, wherein the directing combustion flame or combustion gas from the burner by the expansion joints and the first bent portion to third bent portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23178494A JPH0894006A (en) | 1994-09-27 | 1994-09-27 | Radiant tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23178494A JPH0894006A (en) | 1994-09-27 | 1994-09-27 | Radiant tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0894006A true JPH0894006A (en) | 1996-04-12 |
Family
ID=16928981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23178494A Withdrawn JPH0894006A (en) | 1994-09-27 | 1994-09-27 | Radiant tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0894006A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011196614A (en) * | 2010-03-19 | 2011-10-06 | Jfe Steel Corp | Radiant tube |
| JP2014145527A (en) * | 2013-01-29 | 2014-08-14 | Nippon Steel & Sumitomo Metal | Heating furnace using radiant tube |
| CN110822425A (en) * | 2019-11-01 | 2020-02-21 | 苏州新长光热能科技有限公司 | A protection device that can improve the service life of radiant tube |
-
1994
- 1994-09-27 JP JP23178494A patent/JPH0894006A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011196614A (en) * | 2010-03-19 | 2011-10-06 | Jfe Steel Corp | Radiant tube |
| JP2014145527A (en) * | 2013-01-29 | 2014-08-14 | Nippon Steel & Sumitomo Metal | Heating furnace using radiant tube |
| CN110822425A (en) * | 2019-11-01 | 2020-02-21 | 苏州新长光热能科技有限公司 | A protection device that can improve the service life of radiant tube |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020115 |