JP6028595B2

JP6028595B2 - Heating furnace using radiant tubes

Info

Publication number: JP6028595B2
Application number: JP2013014418A
Authority: JP
Inventors: 勇介土佐; 星野　正則; 正則星野; 和人山村; 崇仁中西
Original assignee: Nippon Steel and Sumitomo Metal Corp
Current assignee: Nippon Steel Corp
Priority date: 2013-01-29
Filing date: 2013-01-29
Publication date: 2016-11-16
Anticipated expiration: 2033-01-29
Also published as: JP2014145527A

Description

本発明は、熱処理炉等の加熱炉に配置されるラジアントチューブ式加熱装置及びその操業方法に関するものである。 The present invention relates to a radiant tube type heating device disposed in a heating furnace such as a heat treatment furnace and an operation method thereof.

ラジアントチューブは、チューブ内でガスを燃焼させることによってチューブを加熱し、チューブからの輻射熱によって対象物を昇温させる装置である。燃焼ガスが対象物に触れることがないため、清浄な雰囲気下で加熱を行うことができる。 A radiant tube is a device that heats a tube by burning gas in the tube and raises the temperature of an object by radiant heat from the tube. Since the combustion gas does not touch the object, heating can be performed in a clean atmosphere.

従来のラジアントチューブには、例えば図１に示す特許文献１の構造がある。
このラジアントチューブはＭ字を横倒ししたような管路を有し、燃焼ガスは上側の吸入口から吸入され、水平方向に進行し、往復して下側の排気口から排気される。特に、多くの場合は図１のように２往復する形であり、４本の直線部とその間の３箇所のＵ字状屈曲部を有する。これ以後、４本の直線部はそれぞれ上から第１の直線部、第２の直線部、第３の直線部、第４の直線部と称し、これらの直線部の間にある３箇所のＵ字状屈曲部はそれぞれ上から第１の屈曲部、第２の屈曲部、第３の屈曲部と称する。 A conventional radiant tube has, for example, the structure of Patent Document 1 shown in FIG.
This radiant tube has a pipe line that is M-shaped and the combustion gas is sucked from the upper suction port, travels in the horizontal direction, reciprocates and is exhausted from the lower exhaust port. In particular, in many cases, the shape is reciprocated twice as shown in FIG. 1, and has four straight portions and three U-shaped bent portions therebetween. Hereinafter, the four straight line portions are referred to as the first straight line portion, the second straight line portion, the third straight line portion, and the fourth straight line portion from the top, respectively, and three U portions located between these straight line portions. The character-shaped bent portions are referred to as a first bent portion, a second bent portion, and a third bent portion, respectively, from the top.

このラジアントチューブは全体として、吸入口と排気口で片側面の炉殻に固定される一方、反対側面の炉殻の支持部ではブラケット部を設けられた第３の屈曲部もしくはその近傍において１点で支持される。ラジアントチューブの各部位については、自重を支えるように、第１の屈曲部と第３の屈曲部との間もしくはその近傍、並びに、第２の屈曲部と排気口に近い側の第４の直線部との間もしくはその近傍にそれぞれサドルを設けることにより支持されていた。 The radiant tube as a whole is fixed to the furnace shell on one side at the suction port and the exhaust port, while the support portion of the furnace shell on the opposite side has one point at or near the third bent portion provided with a bracket portion. Supported by For each portion of the radiant tube, a fourth straight line between the first bent portion and the third bent portion or in the vicinity thereof, and on the side close to the second bent portion and the exhaust port so as to support its own weight. It was supported by providing a saddle between or near each other.

しかし、このラジアントチューブは、高温にさらされ、自重によるクリープと酸化による減肉によって変形し、図２に示すような変形が生じる。この変形により、交換を余議なくされる。 However, this radiant tube is exposed to a high temperature and deforms due to creep due to its own weight and thinning due to oxidation, resulting in deformation as shown in FIG. This modification makes it unnecessary to exchange.

そこで、自重の影響を防ぐために、図３に示す特許文献４のようにラジアントチューブと炉殻との接点を３点に増やし、変形を防ぐ対策が取られてきた。 Therefore, in order to prevent the influence of its own weight, as in Patent Document 4 shown in FIG. 3, measures have been taken to prevent deformation by increasing the number of contact points between the radiant tube and the furnace shell to three points.

しかし、この対策では不十分であり、特許文献２及び特許文献３に記載されているように、３点支持のラジアントチューブの支持部を上下対称な構造として、ある程度変形が進行した後に、ラジアントチューブを上下反転して設置し直して、変形の進展を防ぐという対策が取られてきた。 However, this measure is not sufficient, and as described in Patent Document 2 and Patent Document 3, the support portion of the three-point supported radiant tube has a vertically symmetrical structure, and after the deformation has progressed to some extent, the radiant tube Measures have been taken to prevent the progress of deformation by reversing upside down.

特開平８―２７８００２号公報Japanese Patent Laid-Open No. 8-277002 特開平１１―２５７６１２号公報Japanese Patent Laid-Open No. 11-257612 特開２００５―２４１１４４号公報JP-A-2005-241144 特開平１０−２３７５３９号公報JP-A-10-237539

特許文献１にある、１点支持のラジアントチューブは３点支持のラジアントチューブに比べて、寿命が短い。 The one-point supported radiant tube disclosed in Patent Document 1 has a shorter life than the three-point supported radiant tube.

そのため、近年建設された加熱炉においては、炉殻とラジアントチューブの接点が３点となるように設計されているが、長年使用されてきた加熱炉においては、未だ炉殻とラジアントチューブの接点が１点のまま変更されていないものが多い。 Therefore, in the recently constructed heating furnace, the contact point between the furnace shell and the radiant tube is designed to be three points. However, in the heating furnace that has been used for many years, the contact point between the furnace shell and the radiant tube is still There are many things that have not been changed.

１点支持から３点支持へ変更する為には炉殻の支持部の増設が必要だが、炉に設置されている断熱材を取り外し炉殻に孔をあけ支持部を追加し、断熱材を貼り直す必要があるため、長期間にわたるライン休止と多くの改造費が必要となり、既設の加熱炉における支持部の増設は現実的ではない。
炉を新設するにしても、１点支持（吸排気に対して反対側の炉壁の支持が１点）のほうが３点支持（吸排気に対して反対側の炉壁の支持が２点）よりも、支持部が少ない分炉の構造が単純となり、この部分からの熱漏れも少なくなり、コスト上有利である。 In order to change from one-point support to three-point support, it is necessary to expand the support part of the furnace shell. However, the insulation material installed in the furnace is removed, a hole is made in the furnace shell, a support part is added, and the insulation material is attached. Since it is necessary to fix it, a long line outage and a lot of remodeling costs are required, and it is not realistic to add a support part in an existing heating furnace.
Even if a new furnace is installed, one point support (one point on the furnace wall opposite to the intake / exhaust) is three point support (two points on the opposite wall to the intake / exhaust). As a result, the structure of the furnace with a smaller number of support parts becomes simple, and heat leakage from this part is reduced, which is advantageous in terms of cost.

一方、特許文献２、特許文献３に開示されているように、３点支持構造のラジアントチューブは、反転することで寿命延長が実現されている。 On the other hand, as disclosed in Patent Literature 2 and Patent Literature 3, the life of the radiant tube having the three-point support structure is extended by being inverted.

３点支持構造で或る期間操業した後のラジアントチューブの状態を図４に示し、そのラジアントチューブを反転して装着した状態を図５に示す。使用に伴い、第１の直線部、第２の直線部、第３の直線部が大きく垂れ下がる。これ以上変形が進展すると、管同士の接触により管に亀裂が生じるため、ラジアントチューブを上下反転することで垂れの進行方向を反転させて管同士の接触を防ぎ、長期間ラジアントチューブを使用することができる。 FIG. 4 shows the state of the radiant tube after operating for a certain period with the three-point support structure, and FIG. 5 shows the state where the radiant tube is inverted and attached. With use, the first straight line portion, the second straight line portion, and the third straight line portion droop greatly. If the deformation further develops, the tube will crack due to the contact between the tubes, so the radiant tube is turned upside down to reverse the direction of dripping to prevent the tubes from contacting each other and to use the radiant tube for a long time. Can do.

しかし、現状の１点支持構造のラジアントチューブについては、３点支持構造のものと異なって、その上下反転を実施することはできない。このことにより、現状の１点支持構造のラジアントチューブを用いた加熱炉ではラジアントチューブに熱変形が生じてしまうとチューブ全体を交換する必要が生じ、操業コストを大きく押し上げることとなっていた。 However, the radiant tube having the current one-point support structure cannot be turned upside down unlike the three-point support structure. As a result, in a heating furnace using a radiant tube having a one-point support structure as described above, if the radiant tube is thermally deformed, the entire tube needs to be replaced, which greatly increases the operating cost.

そこで、本発明は、上記問題点に鑑み、既存の１点の支持部でもラジアントチューブの上下反転を実現する構造を提案し、これにより、ラジアントチューブの寿命延長を図り、操業コストを引き下げることを目的としている。 Therefore, in view of the above problems, the present invention proposes a structure that realizes the upside down of the radiant tube even with the existing one support part, thereby extending the life of the radiant tube and reducing the operation cost. It is aimed.

本発明は上記目的を達成するものであって、要旨は以下のとおりである。
（１）炉内に、
Ｍ字を横倒したような上下方向に略対称の管路が炉幅方向へ架け渡されて配置され、
第１の屈曲部または第３の屈曲部に炉幅方向に突出するブラケット部が設けられたラジアントチューブと；
炉殻に設けられた前記ブラケット部を通じて前記ラジアントチューブを支持する支持手段と；
を備えた加熱炉であって、
前記ラジアントチューブは、４本の直線部を有しており、前記直線部は、それぞれ上から、第１の直線部、第２の直線部、第３の直線部、第４の直線部であって、
前記第１の直線部と前記第２の直線部との間にはＵ字状の第１の屈曲部が設けられており、
前記第２の直線部と前記第３の直線部との間にはＵ字状の第２の屈曲部が設けられており、
前記第３の直線部と前記第４の直線部との間にはＵ字状の第３の屈曲部が設けられており、
前記第１の屈曲部と前記第３の屈曲部との間もしくはその近傍にこれらを連結支持する連結支持手段が設けられ、
前記ラジアントチューブの前記第１の屈曲部または前記第３の屈曲部に設けられたブラケット部に対して上下対称に、もう一つのブラケット部が前記第３の屈曲部または前記第１の屈曲部に設けられ、
前記第２の屈曲部もしくはその近傍が吸排気口側の壁に直接もしくは間接的に支持され、
前記第２の直線部と前記第３の直線部との接触は、前記連結支持手段によって防がれているとともに、
前記第１の直線部と前記第２の直線部との接触が防がれ、
前記第３の直線部と前記第４の直線部との接触が防がれ、
前記ラジアントチューブを上下反転しても操業できる装着機能を有していることを特徴とする、ラジアントチューブを用いた加熱炉。 The present invention achieves the above object, and the gist is as follows.
(1) In the furnace
A pipe line that is substantially symmetrical in the vertical direction, such as M-shaped lying down, is placed across the furnace width direction.
A radiant tube provided with a bracket portion protruding in the furnace width direction at the first bent portion or the third bent portion;
Support means for supporting the radiant tube through the bracket portion provided in the furnace shell;
A heating furnace comprising:
The radiant tube has four straight portions, and the straight portions are a first straight portion, a second straight portion, a third straight portion, and a fourth straight portion from above, respectively. And
A U-shaped first bent portion is provided between the first straight portion and the second straight portion,
A U-shaped second bent portion is provided between the second straight portion and the third straight portion,
A U-shaped third bent portion is provided between the third straight portion and the fourth straight portion,
Coupling the support means is provided for connecting supporting them during or near the said first bent portion and the third bent portion,
Vertically symmetrically with respect to the radiant said first bent portion or the third bracket portion provided in the bent portion of the tube, said one more bracket portion third bent portion or the first bent portion Provided,
The second bent portion or in the vicinity thereof is directly or indirectly supported on the wall of the intake and exhaust port side,
Contact between the second straight portion and the third straight portion is prevented by the connection support means,
Contact between the first straight portion and the second straight portion is prevented,
Contact between the third straight portion and the fourth straight portion is prevented,
A heating furnace using a radiant tube, wherein the radiant tube has a mounting function that allows operation even when the radiant tube is turned upside down .

（２）前記ラジアントチューブに、
第３の屈曲部に炉幅方向に突出するブラケット部と、
第１の屈曲部と第３の屈曲部との間もしくはその近傍に連結支持手段であるサドルと、
第１の屈曲部に、第３の屈曲部に設けられたブラケット部と上下対称に設けられた、もう一つのブラケット部と、
第２の屈曲部と排気口に近い側の第４の直線部との間もしくはその近傍に第２の屈曲部を間接的に支持するサドルと、
第２の屈曲部と吸気口に近い側の第１の直線部との間もしくはその近傍に、
第２の屈曲部と排気口に近い側の第４の直線部との間もしくはその近傍に設けられたサドルと上下対称に、
第２の屈曲部を間接的に支持するサドルが設けられたことを特徴とする、（１）に記載のラジアントチューブを用いた加熱炉。 (2) In the radiant tube,
A bracket portion protruding in the furnace width direction at the third bent portion;
A saddle that is a connecting support means between or in the vicinity of the first bent portion and the third bent portion;
Another bracket portion provided vertically symmetrically with the bracket portion provided in the third bent portion in the first bent portion;
A saddle that indirectly supports the second bent portion between or near the second bent portion and the fourth straight portion on the side close to the exhaust port;
Between or in the vicinity of the second bent portion and the first straight portion on the side close to the intake port,
Vertically symmetrical with the saddle provided between or in the vicinity of the second bent portion and the fourth straight portion on the side close to the exhaust port,
The heating furnace using the radiant tube according to (1), wherein a saddle for indirectly supporting the second bent portion is provided.

（３）前記ラジアントチューブに、
第３の屈曲部に炉幅方向に突出するブラケット部と、
第１の屈曲部と第３の屈曲部との間もしくはその近傍に連結支持手段であるサドルと、
第１の屈曲部に、第３の屈曲部に設けられたブラケット部と上下対称に設けられた、もう一つのブラケット部と
第２の屈曲部もしくはその近傍に炉幅方向に突出して吸排気口側の壁に直接に支持する炉幅方向に突出するブラケット部が設けられた
ことを特徴とする、（１）に記載のラジアントチューブを用いた加熱炉。 (3) To the radiant tube,
A bracket portion protruding in the furnace width direction at the third bent portion;
A saddle that is a connecting support means between or in the vicinity of the first bent portion and the third bent portion;
The first bent portion is provided vertically symmetrically with the bracket portion provided in the third bent portion, and protrudes in the furnace width direction at another bracket portion and the second bent portion or in the vicinity thereof, and the intake / exhaust port A heating furnace using a radiant tube according to (1), characterized in that a bracket portion protruding in the furnace width direction is directly supported on the side wall.

（４）前記（１）ラジアントチューブに、
第３の屈曲部に炉幅方向に突出するブラケット部と、
第１の屈曲部に、第３の屈曲部に設けられたブラケット部と上下対称に設けられ、前記第３の屈曲部に設けられたブラケット部と直接接触して支持し合う、もう一つのブラケット部と、
第２の屈曲部と排気口に近い側の第４の直線部との間もしくはその近傍に第２の屈曲部を間接的に支持するサドルと、
第２の屈曲部と吸気口に近い側の第１の直線部との間もしくはその近傍に、
第２の屈曲部と排気口に近い側の第４の直線部との間もしくはその近傍に設けられたサドルと上下対称に、
第２の屈曲部を間接的に支持するサドルが設けられたことを特徴とする、（１）に記載のラジアントチューブを用いた加熱炉。 (4) In the (1) radiant tube,
A bracket portion protruding in the furnace width direction at the third bent portion;
Another bracket provided on the first bent portion so as to be vertically symmetrical with the bracket portion provided on the third bent portion, and in direct contact with and supported by the bracket portion provided on the third bent portion And
A saddle that indirectly supports the second bent portion between or near the second bent portion and the fourth straight portion on the side close to the exhaust port;
Between or in the vicinity of the second bent portion and the first straight portion on the side close to the intake port,
Vertically symmetrical with the saddle provided between or in the vicinity of the second bent portion and the fourth straight portion on the side close to the exhaust port,
The heating furnace using the radiant tube according to (1), wherein a saddle for indirectly supporting the second bent portion is provided.

（５）前記（１）ラジアントチューブに、
第３の屈曲部に炉幅方向に突出するブラケット部と、
第１の屈曲部に、第３の屈曲部に設けられたブラケット部と上下対称に設けられ、前記第３の屈曲部に設けられたブラケット部と直接接触して支持し合う、もう一つのブラケット部と、
第２の屈曲部もしくはその近傍に炉幅方向に突出して吸排気口側の壁に直接に支持する炉幅方向に突出するブラケット部
が設けられたことを特徴とする、（１）に記載のラジアントチューブを用いた加熱炉。 (5) In the (1) radiant tube,
A bracket portion protruding in the furnace width direction at the third bent portion;
Another bracket provided on the first bent portion so as to be vertically symmetrical with the bracket portion provided on the third bent portion, and in direct contact with and supported by the bracket portion provided on the third bent portion And
The bracket part protruding in the furnace width direction that protrudes in the furnace width direction and directly supports the wall on the intake / exhaust port side is provided at or near the second bent portion, as described in (1) A heating furnace using radiant tubes.

（６）前記ラジアントチューブに、
第１の屈曲部に炉幅方向に突出するブラケット部と、
第１の屈曲部と第３の屈曲部との間もしくはその近傍に連結支持手段である係合部が設けられ、
第３の屈曲部に、第１の屈曲部に設けられたブラケット部と上下対称に設けられた、もう一つのブラケット部と、
第２の屈曲部と排気口に近い側の第４の直線部との間もしくはその近傍に第２の屈曲部を間接的に支持するサドルと、
第２の屈曲部と吸気口に近い側の第１の直線部との間もしくはその近傍に、
第２の屈曲部と排気口に近い側の第４の直線部との間もしくはその近傍に設けられたサドルと上下対称に、
第２の屈曲部を間接的に支持するサドルが設けられたことを特徴とする、（１）に記載のラジアントチューブを用いた加熱炉。 (6) In the radiant tube,
A bracket portion protruding in the furnace width direction at the first bent portion;
An engagement portion which is a connection support means is provided between or in the vicinity of the first bent portion and the third bent portion,
Another bracket portion provided on the third bent portion in a vertically symmetrical manner with the bracket portion provided on the first bent portion;
A saddle that indirectly supports the second bent portion between or near the second bent portion and the fourth straight portion on the side close to the exhaust port;
Between or in the vicinity of the second bent portion and the first straight portion on the side close to the intake port,
Vertically symmetrical with the saddle provided between or in the vicinity of the second bent portion and the fourth straight portion on the side close to the exhaust port,
The heating furnace using the radiant tube according to (1), wherein a saddle for indirectly supporting the second bent portion is provided.

（７）前記ラジアントチューブに、
第１の屈曲部に炉幅方向に突出するブラケット部と、
第１の屈曲部と第３の屈曲部との間もしくはその近傍に連結支持手段である係合部が設けられ、
第３の屈曲部に、第１の屈曲部に設けられたブラケット部と上下対称に設けられた、もう一つのブラケット部と、
第２の屈曲部もしくはその近傍に炉幅方向に突出して吸排気口側の壁に直接に支持する炉幅方向に突出するブラケット部が設けられたことを特徴とする、（１）に記載のラジアントチューブを用いた加熱炉。 (7) In the radiant tube,
A bracket portion protruding in the furnace width direction at the first bent portion;
An engagement portion which is a connection support means is provided between or in the vicinity of the first bent portion and the third bent portion,
Another bracket portion provided on the third bent portion in a vertically symmetrical manner with the bracket portion provided on the first bent portion;
The bracket part protruding in the furnace width direction that protrudes in the furnace width direction and directly supports the wall on the intake / exhaust port side is provided at or near the second bent portion, as described in (1) A heating furnace using radiant tubes.

（８）炉殻に設けられて前記下側のブラケット部を支持する前記支持手段が、前記下側のブラケット部の上下変位に追従して鉛直方向上向きに移動または傾動することを特徴とする前記（１）から（７）のいずれかに記載のラジアントチューブを用いた加熱炉。 (8) The support means, which is provided in the furnace shell and supports the lower bracket portion, moves or tilts vertically upward following the vertical displacement of the lower bracket portion. (1) The heating furnace using the radiant tube in any one of (7).

（９）第１の屈曲部と第３の屈曲部との間もしくはその近傍に設けられたサドルの互いに接触して支持し合う面の片方もしくは両方が円筒面状になっていることを特徴とする前記（２）又は（３）に記載のラジアントチューブを用いた加熱炉。 (9) The saddle provided between the first bent portion and the third bent portion or in the vicinity thereof has one or both of the surfaces that come into contact with each other and are supported by a cylindrical surface. A heating furnace using the radiant tube according to (2) or (3).

（１０）前記第１の屈曲部に設けられたブラケット部と前記第３の屈曲部に設けられたブラケット部が互いに接触して支持し合う面の、片方もしくは両方が円筒面状になっていることを特徴とする前記（４）又は（５）に記載のラジアントチューブを用いた加熱炉。 (10) One or both of the surfaces in which the bracket portion provided in the first bent portion and the bracket portion provided in the third bent portion come into contact with each other and support each other are cylindrical. A heating furnace using the radiant tube according to (4) or (5) above.

本発明により、既存の１点の支持部でもラジアントチューブの上下反転を実現するので、ラジアントチューブの寿命延長を図り、操業コストを引き下げることができる。 According to the present invention, since the radiant tube can be turned upside down even at an existing one point of support, the life of the radiant tube can be extended and the operating cost can be reduced.

従来のラジアントチューブを示した正面図である。（特許文献１）It is the front view which showed the conventional radiant tube. (Patent Document 1) 自重クリープと酸化減肉によって変形した従来の１点支持式ラジアントチューブを示した正面図である。It is the front view which showed the conventional one point support type radiant tube deform | transformed by dead weight creep and oxidation thinning. ３点支持構造のラジアントチューブを示した正面図である。（特許文献４）It is the front view which showed the radiant tube of 3 point | piece support structure. (Patent Document 4) 自重クリープと酸化減肉によって変形した従来の３点支持式ラジアントチューブを示した正面図である。It is the front view which showed the conventional 3-point support type radiant tube deform | transformed by dead weight creep and oxidation thinning. 図４のラジアントチューブを上下反転した正面図である。It is the front view which turned the radiant tube of FIG. 4 upside down. ラジアントチューブ装着直後の本発明の第１の実施形態の正面図である。It is a front view of the 1st embodiment of the present invention immediately after radiant tube mounting. （ａ）ラジアントチューブ上下反転前の本発明の第１の実施形態の正面図である。（ｂ）ラジアントチューブ上下反転後の本発明の第１の実施形態の正面図である。(A) It is a front view of the 1st Embodiment of this invention before a radiant tube inversion. (B) It is a front view of the 1st Embodiment of this invention after a radiant tube upside down. （ａ）ラジアントチューブ上下反転前の本発明の第１の実施形態の正面図である。（ｂ）ラジアントチューブ上下反転後の本発明の第１の実施形態の正面図である。(A) It is a front view of the 1st Embodiment of this invention before a radiant tube inversion. (B) It is a front view of the 1st Embodiment of this invention after a radiant tube upside down. 支持手段が上向きに傾動している本発明の第７の実施形態である。It is a 7th embodiment of the present invention in which a support means tilts upward. ブラケット部が支持部に支持されている状態の本発明の第７の実施形態である。It is the 7th Embodiment of this invention of the state in which the bracket part is supported by the support part. 支持部が上向きに傾動している本発明の第８の実施形態である。It is an 8th embodiment of the present invention in which a support part inclines upwards. ブラケット部が支持部に支持されている状態の本発明の第８の実施形態である。It is the 8th Embodiment of this invention of the state in which the bracket part is supported by the support part. ラジアントチューブ装着直後の本発明の第２の実施形態の正面図である。It is a front view of the 2nd Embodiment of this invention immediately after radiant tube mounting | wearing. ラジアントチューブ装着直後の本発明の第３の実施形態の正面図である。It is a front view of the 3rd embodiment of the present invention just after radiant tube mounting. ラジアントチューブ装着直後の本発明の第４の実施形態の正面図である。It is a front view of the 4th Embodiment of this invention immediately after a radiant tube mounting | wearing. 別形態の従来のラジアントチューブを示した正面図である。It is the front view which showed the conventional radiant tube of another form. ラジアントチューブ装着直後の本発明の第５の実施形態の正面図である。It is a front view of the 5th embodiment of the present invention immediately after mounting a radiant tube. ラジアントチューブ装着直後の本発明の第６の実施形態の正面図である。It is a front view of the 6th Embodiment of this invention immediately after radiant tube mounting | wearing. サドルの互いに接触して支持し合う面の片方が円筒面状となっているラジアントチューブの正面図である。FIG. 3 is a front view of a radiant tube in which one of the surfaces of the saddles that are in contact with each other and supported is a cylindrical surface. 図１９のラジアントチューブの変形後の正面図である。It is a front view after a deformation | transformation of the radiant tube of FIG. 図２０のラジアントチューブの上下反転後の正面図である。FIG. 21 is a front view of the radiant tube of FIG. 20 after being turned upside down.

以下、本発明の実施の形態について図面を参照して説明する。なお、本明細書および図面において、実質的に同一の機能構成を有する構成要素については、同一の符号を付することにより重複説明を省略する。なお、各図において、図中の左右方向が炉幅方向である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted. In each figure, the horizontal direction in the figure is the furnace width direction.

図６〜図８を用いて本発明の第１の実施形態を示す。
図６はラジアントチューブ装着直後の本発明の第１の実施形態の正面図である。
本発明の要旨は、炉内に、
Ｍ字を横倒したような上下方向に略対称の管路が炉幅方向へ架け渡されて配置され、
第１の屈曲部５または第３の屈曲部７に炉幅方向に突出するブラケット部８が設けられたラジアントチューブと；
炉殻に設けられた前記ブラケット部８を通じて前記ラジアントチューブを支持する支持手段１３と；
を備えた加熱炉であって、
第１の屈曲部５と第３の屈曲部７との間もしくはその近傍にこれらを連結支持する連結支持手段１２が設けられ、
第２の屈曲部６もしくはその近傍が吸排気口側の壁に直接もしくは間接的に支持され、
前記ラジアントチューブの第１の屈曲部５または第３の屈曲部７に設けられたブラケット部８（または９）に対して上下対称に、もう一つのブラケット部９（または８）が第３の屈曲部７または第１の屈曲部５に設けられたことを特徴とする、ラジアントチューブを用いた加熱炉、である。 A first embodiment of the present invention will be described with reference to FIGS.
FIG. 6 is a front view of the first embodiment of the present invention immediately after mounting the radiant tube.
The gist of the present invention is as follows.
A pipe line that is substantially symmetrical in the vertical direction, such as M-shaped lying down, is placed across the furnace width direction.
A radiant tube in which the first bent portion 5 or the third bent portion 7 is provided with a bracket portion 8 protruding in the furnace width direction;
Support means 13 for supporting the radiant tube through the bracket portion 8 provided in the furnace shell;
A heating furnace comprising:
Connection support means 12 for connecting and supporting these is provided between or in the vicinity of the first bent portion 5 and the third bent portion 7,
The second bent portion 6 or the vicinity thereof is directly or indirectly supported by the wall on the intake / exhaust port side,
The other bracket portion 9 (or 8) is third bent in a vertically symmetrical manner with respect to the bracket portion 8 (or 9) provided in the first bent portion 5 or the third bent portion 7 of the radiant tube. A heating furnace using a radiant tube, which is provided in the portion 7 or the first bent portion 5.

図７（ａ）はラジアントチューブ上下反転前の本発明の第１の実施形態の正面図である。ラジアントチューブは使用に伴い変形し、第１の直線部１、第２の直線部２、第３の直線部３が大きく垂れ下がる。この変形が進行すると直線部同士が接触し、亀裂が発生する為、亀裂の発生前に変形量を元に交換している。 FIG. 7A is a front view of the first embodiment of the present invention before the radiant tube is turned upside down. The radiant tube is deformed with use, and the first straight portion 1, the second straight portion 2, and the third straight portion 3 hang down greatly. As this deformation progresses, the straight portions come into contact with each other and cracks are generated. Therefore, the cracks are exchanged based on the deformation amount before the cracks are generated.

図８はラジアントチューブ上下反転後の本発明の第１の実施形態の正面図である。
ラジアントチューブは、装着治具を介して炉壁に着脱可能に取付けられており、装着治具をたとえば１８０°対称に配置することによって、上下反転して操業できる。
図７（ａ）のように変形したラジアントチューブを上下反転させることにより、垂れの進行方向を逆転させて、管同士の接触を防ぎ、長期間同ラジアントチューブが使用可能となる。
また、第２の屈曲部６もしくはその近傍が、吸排気口側の壁(炉殻)に、第４の直線部４とサドル１０を介して間接的に支持される。さらに、サドル１０の上下対称の位置には、別のサドル１１が設けられる。このサドル１１は、ラジアントチューブが上下反転した場合に、第２の屈曲部６もしくはその近傍を間接的に支持する。 FIG. 8 is a front view of the first embodiment of the present invention after the radiant tube is turned upside down.
The radiant tube is detachably attached to the furnace wall via a mounting jig, and can be operated upside down by arranging the mounting jig symmetrically, for example, 180 °.
By rotating the radiant tube deformed as shown in FIG. 7A upside down, the direction of drooping is reversed to prevent the tubes from contacting each other and the radiant tube can be used for a long time.
Further, the second bent portion 6 or the vicinity thereof is indirectly supported by the wall (furnace shell) on the intake / exhaust port side via the fourth straight portion 4 and the saddle 10. Further, another saddle 11 is provided at a vertically symmetrical position of the saddle 10. The saddle 11 indirectly supports the second bent portion 6 or the vicinity thereof when the radiant tube is turned upside down.

第１の屈曲部５が変形するため、上下反転後に、反転後の第３の屈曲部７と炉殻からの支持部１３との間に隙間が生じると考えられる（図７（ｂ））。この隙間の発生は第１の屈曲部５と第３の屈曲部７との間を連結支持するサドル１２等によって軽減されることができるが、なくすことは困難である。そこで、この反転時に生じる隙間が、反転後にどの程度ラジアントチューブに影響があるか熱弾塑性クリープ解析を実施することにより評価を行った。
まず、反転前に生じる第１の屈曲部５の変形をＦＥＭを用いた計算によって求め、ラジアントチューブがクリープ変形によって垂れ下がり、反転後に生じる隙間が埋まるまでの時間を計算によって算出し、また、その間に発生する応力を算出した。
算出された応力と時間から、ラーソンミラーパラメータを用いて整理を行い、垂れ下がるまでの時間と応力を元に、しばらくするとクリープ破断等を起こさずに支持部に接触することがわかった。
このことから、第１の屈曲部５と第３の屈曲部７との間を連結支持するサドル１２等によってその間隔を維持するように補強しておけば、吸排気に対して反対側の炉壁の支持は、上下反転しても、１点でも強度的に問題ないことがわかった。また、実際に実施した場合にも問題は生じなかった。
ラジアントチューブと炉殻との接点が３点のものと比較して、炉殻との接点が１点または２点のものは、接点が少ないため反転時に位置合わせが容易であり、短時間で反転組み換えが実施出来た。 Since the 1st bending part 5 deform | transforms, it is thought that a clearance gap will arise between the 3rd bending part 7 after inversion and the support part 13 from a furnace shell after upside down inversion (FIG.7 (b)). The generation of this gap can be reduced by the saddle 12 or the like that supports the connection between the first bent portion 5 and the third bent portion 7, but it is difficult to eliminate them. Therefore, the extent to which the gap generated during the reversal has an influence on the radiant tube after the reversal was evaluated by performing a thermoelastic-plastic creep analysis.
First, the deformation of the first bent portion 5 occurring before reversal is obtained by calculation using FEM, and the time until the radiant tube hangs down by creep deformation and the gap generated after reversal is calculated is calculated. The generated stress was calculated.
Based on the calculated stress and time, the Larson mirror parameters were used to organize, and based on the time and stress until the sag, it was found that after a while, the support part was contacted without causing creep rupture.
For this reason, if the saddle 12 or the like that connects and supports the first bent portion 5 and the third bent portion 7 is reinforced so as to maintain the interval, the furnace on the opposite side to the intake and exhaust air It was found that even if the wall support is turned upside down, there is no problem in strength even at one point. Also, no problem occurred when actually implemented.
Compared with one with 3 points of contact between the radiant tube and the furnace shell, one or 2 points of contact with the furnace shell is easy to align at the time of reversal because there are few contacts, and reversing in a short time Recombination could be carried out.

図１３はラジアントチューブ装着直後の本発明の第２の実施形態の正面図である。
第１の屈曲部５と第３の屈曲部７にそれぞれ炉幅方向に突出する上下対称のブラケット部９，８を設けられたラジアントチューブである。第１の屈曲部５と第３の屈曲部７との間にサドル１２はないが、ブラケット部９，８同士が連結し合っており（直接接触して支持し合っており）、その間隔が維持されるように補強されている。したがって、第１の屈曲部５は、第３の屈曲部７のブラケット部８により支持される。
図１４はラジアントチューブ装着直後の本発明の第３の実施形態の正面図である。
前記ラジアントチューブの第２の屈曲部６の排気口に近い側に炉幅方向に突出するように設けられたブラケット部１４により、直接的に接触して支持されるラジアントチューブである。 FIG. 13 is a front view of the second embodiment of the present invention immediately after mounting the radiant tube.
It is a radiant tube in which the first bent portion 5 and the third bent portion 7 are provided with vertically symmetrical bracket portions 9 and 8 respectively protruding in the furnace width direction. There is no saddle 12 between the first bent portion 5 and the third bent portion 7, but the bracket portions 9 and 8 are connected to each other (supported by direct contact), and the distance between them is Reinforced to maintain. Accordingly, the first bent portion 5 is supported by the bracket portion 8 of the third bent portion 7.
FIG. 14 is a front view of the third embodiment of the present invention immediately after mounting the radiant tube.
The radiant tube is a radiant tube supported in direct contact with a bracket portion 14 provided so as to protrude in the furnace width direction on the side close to the exhaust port of the second bent portion 6 of the radiant tube.

図１５はラジアントチューブ装着直後の本発明の第４の実施形態の正面図である。
第１の屈曲部５と第３の屈曲部７にそれぞれ上下対称のブラケット部８，９を設けられたラジアントチューブである。第１の屈曲部５と第３の屈曲部７との間にサドル１２はないが、ブラケット部８，９同士が連結し合っており（直接接触して支持し合っており）、その間隔が維持されるように補強されている。したがって、第１の屈曲部５は、第３の屈曲部７のブラケット部８により支持される。 FIG. 15 is a front view of the fourth embodiment of the present invention immediately after mounting the radiant tube.
This is a radiant tube in which the first bent portion 5 and the third bent portion 7 are provided with vertically symmetrical bracket portions 8 and 9, respectively. There is no saddle 12 between the first bent portion 5 and the third bent portion 7, but the bracket portions 8 and 9 are connected to each other (supported by direct contact), and the distance between them is Reinforced to maintain. Accordingly, the first bent portion 5 is supported by the bracket portion 8 of the third bent portion 7.

図１６は別形態の従来のラジアントチューブを示した正面図である。
第１の屈曲部５に炉幅方向に突出するブラケット部９が設けられ、
第１の屈曲部５と第３の屈曲部７との間もしくはその近傍に、第１の屈曲部５と第３の屈曲部７とを連結支持する係合部１５が設けられ、第２の屈曲部６と排気口に近い側の第４の直線部４との間もしくはその近傍にサドル１０を設けられたラジアントチューブと；
炉殻に設けられた前記ブラケット部９を通じて前記ラジアントチューブを支持する支持手段１３が設けられる。
上下対称のもう一つのブラケット部がないので、ラジアントチューブを上下反転して使用することができない。 FIG. 16 is a front view showing another conventional radiant tube.
The first bent portion 5 is provided with a bracket portion 9 that protrudes in the furnace width direction,
An engaging portion 15 for connecting and supporting the first bent portion 5 and the third bent portion 7 is provided between or in the vicinity of the first bent portion 5 and the third bent portion 7, A radiant tube provided with a saddle 10 between or in the vicinity of the bent portion 6 and the fourth straight portion 4 on the side close to the exhaust port;
Support means 13 for supporting the radiant tube through the bracket portion 9 provided in the furnace shell is provided.
Since there is no other vertical bracket part, the radiant tube cannot be used upside down.

図１７はラジアントチューブ装着直後の本発明の第５の実施形態の正面図である。
前記ラジアントチューブの第３の屈曲部７に、第１の屈曲部５に設けられたブラケット部９と上下対称に、もう一つのブラケット部８を設け、
第２の屈曲部６と吸気口に近い側の第１の直線部１との間もしくはその近傍にサドル１１を設けることにより、上下反転させた際に、炉殻に設けられた支持部１３を通じて前記ラジアントチューブが支持される構造である。
第１の屈曲部５に設けられるブラケット部９と、第３の屈曲部７に設けられるブラケット部８とは、係合部１５によって係合し、直接的に接触して支持し合っている。 FIG. 17 is a front view of the fifth embodiment of the present invention immediately after mounting the radiant tube.
In the third bent portion 7 of the radiant tube, another bracket portion 8 is provided vertically symmetrically with the bracket portion 9 provided in the first bent portion 5,
By providing a saddle 11 between or in the vicinity of the second bent portion 6 and the first straight portion 1 on the side close to the intake port, when inverted upside down, through the support portion 13 provided in the furnace shell The radiant tube is supported.
The bracket portion 9 provided in the first bent portion 5 and the bracket portion 8 provided in the third bent portion 7 are engaged by the engaging portion 15 and are in direct contact with each other and supported.

図１８はラジアントチューブ装着直後の本発明の第６の実施形態の正面図である。
前記ラジアントチューブの第２の屈曲部６を排気口に近い側より設けられたブラケット部１４より支持されるラジアントチューブである。
図１３、１４、１５、１７及び１８の第２〜６の実施形態はいずれも、実施形態１と同様に、吸排気に対して反対側の炉壁の支持が１点であっても、上下反転をすることによってラジアントチューブの寿命を長くすることができた。 FIG. 18 is a front view of a sixth embodiment of the present invention immediately after mounting a radiant tube.
The radiant tube is a radiant tube that is supported by a bracket portion 14 provided on the second bent portion 6 of the radiant tube from the side close to the exhaust port.
In any of the second to sixth embodiments shown in FIGS. 13, 14, 15, 17 and 18, as in the first embodiment, even if the furnace wall on the opposite side to the intake / exhaust is supported at one point, The life of the radiant tube could be extended by inversion.

特許文献２及び特許文献３に見られるような手段を用いて、１点支持の場合でも反転可能であると考え実施しようとしたが、３点支持の場合と比較して１点支持の場合には図７に示すように、第１の屈曲部５の変形が大きく、第１の屈曲部５が大きく鉛直方向下に下降し、また第１の屈曲部５が紙面垂直方向に変形する。このため、上下反転した後には、元々第１の屈曲部５の位置にあったブラケット部９が、炉殻からの支持部１３よりも上方にきてしまうという問題点がある。 Using the means shown in Patent Document 2 and Patent Document 3, we tried to implement it even if it was 1 point support, but in the case of 1 point support compared to 3 points support. As shown in FIG. 7, the first bent portion 5 is greatly deformed, the first bent portion 5 is greatly lowered in the vertical direction, and the first bent portion 5 is deformed in the direction perpendicular to the paper surface. For this reason, after upside down, the bracket part 9 originally located at the position of the first bent part 5 has a problem that it comes above the support part 13 from the furnace shell.

特許文献２にあるような構造を取られている場合は、ラジアントチューブが変形し反転した時に、反転後のラジアントチューブの第３の屈曲部７が浮いている状態になり、支持されていない状況が続くこととなる。強度上問題はないことはすでに述べたが、片持ち梁の状態が長時間続くことは振動しやすいこと、第１の直線部１、第４の直線部４の根元に大きな応力が発生しやすいことなど、あまり好ましい状態とは言えない。
また、ラジアントチューブの変形が進むにつれて、第３の屈曲部７のブラケット部８が炉殻からの支持部１３に接触することが考えられるが、特許文献２にあるような構造だと、支持部の溝部にうまく入らない可能性が非常に高い。 When the structure as in Patent Document 2 is taken, when the radiant tube is deformed and inverted, the third bent portion 7 of the radiant tube after the inversion is in a floating state and is not supported. Will continue. Although it has already been described that there is no problem in strength, if the cantilever state lasts for a long time, it tends to vibrate, and a large stress is likely to be generated at the base of the first straight portion 1 and the fourth straight portion 4. This is not a very favorable state.
Further, as the deformation of the radiant tube progresses, it is conceivable that the bracket portion 8 of the third bent portion 7 contacts the support portion 13 from the furnace shell. There is a very high possibility that it will not fit into the groove of this.

第１の屈曲部５の変形を抑制するために、チューブ間の拘束を強くすることも想定されるが、拘束により生じる熱応力によってチューブに亀裂や座屈が生じてしまうため、拘束を強化することもできない。 In order to suppress the deformation of the first bent portion 5, it is assumed that the constraint between the tubes is strengthened. However, the thermal stress generated by the constraint causes cracking and buckling in the tube, so the constraint is strengthened. I can't do that either.

また、特許文献３にあるような構造を取った場合は、反転した後にブラケット部が従来あるべき場所から１００ｍｍほど上方に位置することになるため、その１００ｍｍだけ余分に支持部を拡大する必要が生じる。しかし、支持部の拡大を行うと、断熱部の除去が必要となるため、炉体放散による熱損失が大きくなり、燃料コストが上昇する。このため、特許文献３にあるような方法を実施することは難しい。 In addition, when the structure as in Patent Document 3 is taken, the bracket portion is positioned about 100 mm above the place where the bracket should be after being inverted, so it is necessary to enlarge the support portion by an extra 100 mm. Arise. However, if the support part is enlarged, it is necessary to remove the heat insulating part, so that heat loss due to the furnace body dissipation increases, and the fuel cost increases. For this reason, it is difficult to implement the method as in Patent Document 3.

（ｄ）反転させた後の第３屈曲部７の紙面垂直方向の変形を拘束する部分がないため、第３屈曲部７が垂れて炉殻からの支持部１３と接触するまでに、紙面垂直方向に変形してしまい支持部１３にうまくはまらない可能性が生じる。そのために、炉殻から出ている支持部１３を改良する。
ばね１６を用いた機構とすることで、支持部１３が鉛直方向上に伸び、上方に位置する第３屈曲部７のブラケット部８を迎えにいくようにする。（図９〜１２参照） (D) Since there is no portion constraining the deformation in the direction perpendicular to the paper surface of the third bent portion 7 after being reversed, the third bent portion 7 is perpendicular to the paper surface until the third bent portion 7 hangs down and contacts the support portion 13 from the furnace shell. There is a possibility that the support portion 13 will not fit well due to deformation in the direction. Therefore, the support part 13 which has come out from the furnace shell is improved.
By adopting a mechanism using the spring 16, the support portion 13 extends in the vertical direction so that the bracket portion 8 of the third bent portion 7 located above is picked up. (See Figs. 9-12)

そこで、通常支持部１３の締結部が２点ある部分の下方に、軟らかいばね１６を設置して、支持部１３が接触していない場合は、支持部１３が上方へ位置する。これにより、第３の屈曲部７が変形により上方に位置している場合には、炉殻より出た支持部１３が上方に移動し、ラジアントチューブからのブラケット部８と接触するようになり、紙面垂直方向の変形を拘束することが可能となる。 Therefore, when the soft spring 16 is installed below the portion where the fastening portion of the support portion 13 has two points, and the support portion 13 is not in contact, the support portion 13 is positioned upward. Thereby, when the third bent portion 7 is positioned above due to the deformation, the support portion 13 protruding from the furnace shell moves upward and comes into contact with the bracket portion 8 from the radiant tube, It becomes possible to restrain deformation in the direction perpendicular to the paper surface.

図９は支持部１３が上向きに傾動している本発明の第７の実施形態であり、図１０はブラケット部８が支持部１３に支持されている状態の本発明の第７の実施形態である。
ばね１６により、支持部１３が接触していない場合は、支持部１３が上方へ位置する。これにより、第３の屈曲部７が変形により上方に位置している場合には、炉殻より出た支持部１３が上方に移動し、ラジアントチューブからのブラケット部８と接触するようになり、紙面垂直方向の変形を拘束することが可能となる。 FIG. 9 is a seventh embodiment of the present invention in which the support portion 13 is tilted upward, and FIG. 10 is a seventh embodiment of the present invention in a state where the bracket portion 8 is supported by the support portion 13. is there.
When the support portion 13 is not in contact with the spring 16, the support portion 13 is positioned upward. Thereby, when the third bent portion 7 is positioned above due to the deformation, the support portion 13 protruding from the furnace shell moves upward and comes into contact with the bracket portion 8 from the radiant tube, It becomes possible to restrain deformation in the direction perpendicular to the paper surface.

図１１は支持部１３が上向きに傾動している本発明の第８の実施形態であり、図１２はブラケット部８が支持部１３に支持されている状態の本発明の第８の実施形態である。
ばね１６により、支持部１３が接触していない場合は、支持部１３が上方へ位置する。これにより、第３の屈曲部７が変形により上方に位置している場合には、炉殻より出た支持部１３が上方に移動し、ラジアントチューブからの支持部１３と接触するようになり、紙面垂直方向の変形を拘束することが可能となる。 FIG. 11 shows an eighth embodiment of the present invention in which the support portion 13 is tilted upward, and FIG. 12 shows an eighth embodiment of the present invention in a state where the bracket portion 8 is supported by the support portion 13. is there.
When the support portion 13 is not in contact with the spring 16, the support portion 13 is positioned upward. Thereby, when the third bent portion 7 is positioned upward due to the deformation, the support portion 13 coming out of the furnace shell moves upward and comes into contact with the support portion 13 from the radiant tube, It becomes possible to restrain deformation in the direction perpendicular to the paper surface.

操業条件によっては、図８（ａ）に示すように、第１の屈曲部５の変形が大きく、第１の屈曲部５の上方に傾く。このため、上下反転した後には、元々第１の屈曲部５の位置にあったブラケット部９が、炉殻からの支持部１３よりも下方にきてしまい干渉するという問題点があり得る。（図８（ｂ）） Depending on the operating conditions, as shown in FIG. 8A, the first bent portion 5 is largely deformed and tilts upward from the first bent portion 5. For this reason, after upside down, there may be a problem that the bracket portion 9 originally located at the position of the first bent portion 5 comes below the support portion 13 from the furnace shell and interferes therewith. (Fig. 8 (b))

反転後のブラケット部８が、支持部１３と干渉する原因は、ラジアントチューブが変形するにしたがって、第１の屈曲部５と第３の屈曲部７とを連結支持するサドル１２同士が傾いて接触し、結果的に第１の屈曲部５が傾き、ブラケット部８が新品時よりも上方に移動するためである。 The cause of the interference of the bracket portion 8 after the inversion with the support portion 13 is that the saddles 12 that connect and support the first bent portion 5 and the third bent portion 7 are inclined and contacted as the radiant tube is deformed. As a result, the first bent portion 5 is inclined, and the bracket portion 8 moves upward as compared with the new one.

そこで、第１の屈曲部５と第３の屈曲部７とを連結支持するサドル１２同士が傾き第１の屈曲部５が傾いてもブラケット部８が新品時よりも上方に移動しないために、サドル１２の互いに接触して支持し合う接触面の片方もしくは両方に円筒状の面を導入する（図１９）。なお、図１９では、片方の面が円筒面状に形成される構成を示すが、両方の面が円筒面状に形成される構成であってもよい。 Therefore, since the saddles 12 for connecting and supporting the first bent portion 5 and the third bent portion 7 are inclined to each other and the first bent portion 5 is inclined, the bracket portion 8 does not move upward as compared with a new product. A cylindrical surface is introduced into one or both of the contact surfaces of the saddle 12 that are in contact with each other and supported (FIG. 19). Although FIG. 19 shows a configuration in which one surface is formed in a cylindrical surface shape, a configuration in which both surfaces are formed in a cylindrical surface shape may be used.

この円筒状の曲率の導入により、第１の屈曲部５が大きく傾いたとしても、円筒状の面により第１屈曲部５の位置が下がるため、結果としてブラケット部８の位置が新品時よりも上方に移動することはない。（図２０、２１） Even if the first bent portion 5 is greatly inclined due to the introduction of the cylindrical curvature, the position of the first bent portion 5 is lowered by the cylindrical surface. It does not move upward. (Figs. 20 and 21)

本発明者らは、本発明として図６の形状及び比較例として図１６の形状のラジアントチューブを実機の炉に装着し、本発明の評価を行った。
燃焼ガス：ＣＯＧ
燃焼温度：１０００℃〜１３００℃
炉内温度：７００℃〜１０００℃
加熱炉：ＣＦＢ（セラミックファイバーブランケット）とＳＵＳによって構成されている。
熱処理対象鋼板材質：一般材〜ハイテン
熱処理対象鋼板寸法：板厚０．３〜３．０ｍｍ、板巾６００〜１８００ｍｍ
設備設置位置：ＣＡＰＬまたはＣＧＬの加熱炉
ラジアントチューブ概要：材質ＳＣＨ２２、炉内幅３０００ｍｍ
比較例：６０か月使用したところで、ラジアントチューブの寿命が来て交換した。
実施例：４８か月使用したところで、ラジアントチューブの上下を反転させ、
さらに９０か月使用したところでラジアントチューブの寿命を迎えた。
このように本発明によってラジアントチューブの大幅な長寿命化を実現した。このような長寿命化によって加熱炉の操業コストは大幅に下げることができる。 The inventors of the present invention installed the radiant tube having the shape of FIG. 6 as a present invention and the shape of FIG. 16 as a comparative example in an actual furnace, and evaluated the present invention.
Combustion gas: COG
Combustion temperature: 1000 ° C to 1300 ° C
Furnace temperature: 700 ° C to 1000 ° C
Heating furnace: composed of CFB (ceramic fiber blanket) and SUS.
Steel plate material to be heat-treated: General material to steel plate to be heat-treated, Dimension: Plate thickness 0.3 to 3.0 mm, Plate width 600 to 1800 mm
Equipment installation position: CAPL or CGL heating furnace radiant tube Outline: Material SCH22, furnace width 3000mm
Comparative example: After 60 months of use, the radiant tube had reached the end of its life and was replaced.
Example: After 48 months of use, the radiant tube is turned upside down,
After 90 months of use, the life of the radiant tube was reached.
As described above, the present invention has realized a significant increase in the life of the radiant tube. Such a long life can greatly reduce the operating cost of the heating furnace.

以上、添付図面を参照しながら本発明の好適な実施の形態について説明したが、本発明はかかる例に限定されない。当業者であれば、特許請求の範囲に記載された思想の範疇内において、各種の実施形態に相到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。 The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that those skilled in the art can reach various embodiments within the scope of the idea described in the claims, and these are naturally within the technical scope of the present invention. Understood.

本発明は、熱処理炉等の加熱炉に配置されるラジアントチューブ式加熱装置及びその操業方法においてラジアントチューブの長寿命化又は、これによるコストダウンに有用である。 INDUSTRIAL APPLICABILITY The present invention is useful for extending the life of a radiant tube or reducing the cost thereof in a radiant tube heating device and an operating method thereof disposed in a heating furnace such as a heat treatment furnace.

１第１の直線部
２第２の直線部
３第３の直線部
４第４の直線部
５第１の屈曲部
６第２の屈曲部
７第３の屈曲部
８第３の屈曲部に設けられたブラケット部
９第３の屈曲部に設けられたブラケット部と上下対称に、第１の屈曲部に設けられたブラケット部
１０第２の屈曲部と吸気口に近い側の第４の直線部との間もしくはその近傍に設けられたサドル
１１第２の屈曲部と吸気口に近い側の第４の直線部との間もしくはその近傍に設けられたサドルと上下対称に、第２の屈曲部と排気口に近い側の第１の直線部との間もしくはその近傍に設けられたサドル
１２第１の屈曲部と第３の屈曲部との間に設けられたサドル
１３吸入口と排気口と反対側面の炉殻の支持部 DESCRIPTION OF SYMBOLS 1 1st straight line part 2 2nd straight line part 3 3rd straight line part 4 4th straight line part 5 1st bending part 6 2nd bending part 7 3rd bending part 8 It provides in the 3rd bending part Bracket portion 9 Bracket portion provided in the first bent portion 10 is vertically symmetrical with the bracket portion provided in the third bent portion 10 The second straight portion on the side close to the second bent portion and the intake port The saddle 11 provided between or in the vicinity thereof and the second bent portion symmetrically with the saddle provided between or near the second bent portion and the fourth straight portion on the side close to the intake port. And a first saddle 12 provided between or near the first straight portion on the side close to the exhaust port Saddle 13 provided between the first bent portion and the third bent portion Opposite side furnace shell support

Claims

In the furnace,
A pipe line that is substantially symmetrical in the vertical direction, such as M-shaped lying down, is placed across the furnace width direction.
A radiant tube provided with a bracket portion protruding in the furnace width direction at the first bent portion or the third bent portion;
Support means for supporting the radiant tube through the bracket portion provided in the furnace shell;
A heating furnace comprising:
The radiant tube has four straight portions, and the straight portions are a first straight portion, a second straight portion, a third straight portion, and a fourth straight portion from above, respectively. And
A U-shaped first bent portion is provided between the first straight portion and the second straight portion,
A U-shaped second bent portion is provided between the second straight portion and the third straight portion,
A U-shaped third bent portion is provided between the third straight portion and the fourth straight portion,
Coupling the support means is provided for connecting supporting them during or near the said first bent portion and the third bent portion,
Vertically symmetrically with respect to the radiant said first bent portion or the third bracket portion provided in the bent portion of the tube, said one more bracket portion third bent portion or the first bent portion Provided,
The second bent portion or in the vicinity thereof is directly or indirectly supported on the wall of the intake and exhaust port side,
Contact between the second straight portion and the third straight portion is prevented by the connection support means,
Contact between the first straight portion and the second straight portion is prevented,
Contact between the third straight portion and the fourth straight portion is prevented,
A heating furnace using a radiant tube, wherein the radiant tube has a mounting function that allows operation even when the radiant tube is turned upside down .

In the radiant tube,
A bracket portion protruding in the furnace width direction at the third bent portion;
A saddle that is a connecting support means between or in the vicinity of the first bent portion and the third bent portion;
Another bracket portion provided vertically symmetrically with the bracket portion provided in the third bent portion in the first bent portion;
A saddle that indirectly supports the second bent portion between or near the second bent portion and the fourth straight portion on the side close to the exhaust port;
Between or in the vicinity of the second bent portion and the first straight portion on the side close to the intake port,
Vertically symmetrical with the saddle provided between or in the vicinity of the second bent portion and the fourth straight portion on the side close to the exhaust port,
The heating furnace using a radiant tube according to claim 1, wherein a saddle for indirectly supporting the second bent portion is provided.

In the radiant tube,
A bracket portion protruding in the furnace width direction at the third bent portion;
A saddle that is a connecting support means between or in the vicinity of the first bent portion and the third bent portion;
The first bent portion is provided symmetrically with the bracket portion provided in the third bent portion, and another bracket portion and the second bent portion or the vicinity thereof projecting in the furnace width direction to the intake / exhaust port The heating furnace using the radiant tube according to claim 1, wherein a bracket portion protruding in a furnace width direction that is directly supported by a side wall is provided.

In the radiant tube,
A bracket portion protruding in the furnace width direction at the third bent portion;
Another bracket provided on the first bent portion so as to be vertically symmetrical with the bracket portion provided on the third bent portion, and in direct contact with and supported by the bracket portion provided on the third bent portion And
A saddle that indirectly supports the second bent portion between or near the second bent portion and the fourth straight portion on the side close to the exhaust port;
Between or in the vicinity of the second bent portion and the first straight portion on the side close to the intake port,
Vertically symmetrical with the saddle provided between or in the vicinity of the second bent portion and the fourth straight portion on the side close to the exhaust port,
The heating furnace using a radiant tube according to claim 1, wherein a saddle for indirectly supporting the second bent portion is provided.

In the radiant tube,
A bracket portion protruding in the furnace width direction at the third bent portion;
Another bracket provided on the first bent portion so as to be vertically symmetrical with the bracket portion provided on the third bent portion, and in direct contact with and supported by the bracket portion provided on the third bent portion And
The bracket portion protruding in the furnace width direction that protrudes in the furnace width direction and is directly supported by the wall on the intake / exhaust port side is provided at or near the second bent portion. A heating furnace using radiant tubes.

In the radiant tube,
A bracket portion protruding in the furnace width direction at the first bent portion;
An engagement portion which is a connection support means is provided between or in the vicinity of the first bent portion and the third bent portion,
Another bracket portion provided on the third bent portion in a vertically symmetrical manner with the bracket portion provided on the first bent portion;
A saddle that indirectly supports the second bent portion between or near the second bent portion and the fourth straight portion on the side close to the exhaust port;
Between or in the vicinity of the second bent portion and the first straight portion on the side close to the intake port,
Vertically symmetrical with the saddle provided between or in the vicinity of the second bent portion and the fourth straight portion on the side close to the exhaust port,
The heating furnace using a radiant tube according to claim 1, wherein a saddle for indirectly supporting the second bent portion is provided.

In the radiant tube,
A bracket portion protruding in the furnace width direction at the first bent portion;
An engagement portion which is a connection support means is provided between or in the vicinity of the first bent portion and the third bent portion,
Another bracket portion provided on the third bent portion in a vertically symmetrical manner with the bracket portion provided on the first bent portion;
The bracket part protruding in the furnace width direction that protrudes in the furnace width direction and supports directly on the wall on the intake / exhaust port side is provided at or near the second bent portion. A heating furnace using radiant tubes.

The said support means which is provided in a furnace shell and supports the said lower bracket part moves or tilts vertically upward following the vertical displacement of the said lower bracket part. A heating furnace using the radiant tube according to claim 1.

One or both of the surfaces of the saddle provided between or in the vicinity of the first bent portion and the third bent portion in contact with each other and supporting each other are cylindrical. A heating furnace using the radiant tube according to Item 2 or 3.

One or both of the surfaces in which the bracket portion provided in the first bent portion and the bracket portion provided in the third bent portion are in contact with each other and supported are cylindrical. A heating furnace using the radiant tube according to claim 4 or 5.