JP2012247082A - Air preheater - Google Patents

Air preheater Download PDF

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JP2012247082A
JP2012247082A JP2011117016A JP2011117016A JP2012247082A JP 2012247082 A JP2012247082 A JP 2012247082A JP 2011117016 A JP2011117016 A JP 2011117016A JP 2011117016 A JP2011117016 A JP 2011117016A JP 2012247082 A JP2012247082 A JP 2012247082A
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metal wire
air preheater
tube
air
turbulent flow
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JP5767020B2 (en
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Mikio Ochi
幹夫 越智
Satoshi Shibuya
聡 渋谷
Shinji Gomi
伸二 五味
Kazuo Fujimoto
和男 藤本
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Thyssenkrupp Otto
JFE Steel Corp
ThyssenKrupp Otto KK
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Thyssenkrupp Otto
JFE Steel Corp
ThyssenKrupp Otto KK
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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Abstract

PROBLEM TO BE SOLVED: To provide an air preheater that effectively preheats air for combustion by use of sensible heat of a combustion gas exhausted from a radiant tube.SOLUTION: The air preheater includes: an outer pipe 14 that is inserted in the radiant tube 11 of a radiant-tube-type combustion device while a tip thereof is closed; an inner pipe 16 that is arranged inside the outer pipe 14 while the center thereof corresponds with that of the outer pipe 14; and an air supply pipe 18 that supplies the air 13 for combustion to the inner pipe 16. A turbulence generator 19 is provided between the outer pipe 14 and the inner pipe 16, the turbulence generator being formed by a metal wire 20 being bent in a coil-spring shape so that the metal wire 20 comes into contact with an inner face of the outer pipe 14 in a spiral.

Description

本発明は、鋼材加熱炉などの工業用加熱炉で炉内加熱装置して用いられるラジアントチューブ式燃焼装置に付設される空気予熱器に関するものである。   The present invention relates to an air preheater attached to a radiant tube combustion apparatus used as an in-furnace heating apparatus in an industrial heating furnace such as a steel material heating furnace.

ラジアントチューブ式燃焼装置（ラジアントチューブバーナとも称される。）は、燃料ガスを燃焼用空気と共に燃焼するバーナと、このバーナで発生した燃焼ガス熱を炉内に放熱するラジアントチューブとからなり、このようなラジアントチューブ式燃焼装置には、燃焼用空気を予熱する空気予熱器がラジアントチューブの燃焼ガス排出側端部に付設されている。   A radiant tube combustion device (also called a radiant tube burner) is composed of a burner that burns fuel gas together with combustion air, and a radiant tube that dissipates the heat of combustion gas generated in the burner into the furnace. In such a radiant tube combustion device, an air preheater for preheating combustion air is attached to the end of the radiant tube on the combustion gas discharge side.

ラジアントチューブ式燃焼装置に付設される空気予熱器は、ラジアントチューブ内に先端部を閉塞されて挿入される金属製の外管と、この外管と中心を一致させて外管の内側に配置された内管と、この内管に燃焼用空気を供給する空気供給管となり、ラジアントチューブから排出される燃焼ガスの顕熱を回収して燃焼用空気を予熱する構造となっている（例えば、特許文献１、特許文献２参照）。   The air preheater attached to the radiant tube type combustion device is arranged inside the outer tube with a metal outer tube inserted with the tip closed in the radiant tube and the center of the outer tube aligned. And an air supply pipe that supplies combustion air to the inner pipe, and has a structure for recovering sensible heat of the combustion gas discharged from the radiant tube and preheating the combustion air (for example, a patent) Reference 1 and Patent Reference 2).

特開昭６３−１５００７号公報Japanese Patent Laid-Open No. 63-15007 特開平７−３０５８３３号公報JP 7-305833 A

しかしながら、このような空気予熱器では、空気供給管から内管に供給された燃焼用空気は外管と内管との間に形成された空気予熱路を層流となって流れるため、空気予熱路に流入した燃焼用空気のうち外管の内面側を流れる燃焼用空気は外管の外面側を流れる燃焼ガスと熱交換するが、内管の外面側を流れる燃焼用空気は燃焼ガスと熱交換しない。このため、燃焼ガスとの熱交換効率が低く、燃焼用空気を効率的に予熱することができないという問題があった。   However, in such an air preheater, the combustion air supplied from the air supply pipe to the inner pipe flows in a laminar flow through the air preheating path formed between the outer pipe and the inner pipe. Of the combustion air that flows into the passage, the combustion air that flows on the inner surface side of the outer tube exchanges heat with the combustion gas that flows on the outer surface side of the outer tube, but the combustion air that flows on the outer surface side of the inner tube moves with the combustion gas and heat. Do not replace. For this reason, there was a problem that heat exchange efficiency with combustion gas was low and combustion air could not be preheated efficiently.

また、空気予熱器の下流側には燃料ガスを予熱する燃料予熱器が配置されている場合が多いため、空気予熱器の予熱効率が低くなると、燃焼ガスが高温のまま燃料予熱器に供給される。このため、空気予熱器から排出された燃焼ガスによって燃料ガスが過度に予熱され、カップリング反応やスーティング反応が発生してバーナの燃料ガス通路に固形物が析出するおそれもあった。
本発明は、上述した問題点に着目してなされたものであり、ラジアントチューブから排出される燃焼ガスの顕熱により燃焼用空気を効率的に予熱することのできる空気予熱器を提供することを目的とするものである。 In many cases, a fuel preheater that preheats fuel gas is disposed downstream of the air preheater. Therefore, if the preheat efficiency of the air preheater is lowered, the combustion gas is supplied to the fuel preheater at a high temperature. The For this reason, the fuel gas is excessively preheated by the combustion gas discharged from the air preheater, which may cause a coupling reaction or a sooting reaction to deposit solids in the fuel gas passage of the burner.
This invention is made paying attention to the problem mentioned above, and provides the air preheater which can preheat combustion air efficiently by the sensible heat of the combustion gas discharged | emitted from a radiant tube. It is the purpose.

上記目的を達成するために、請求項１の発明は、ラジアントチューブ式燃焼装置のラジアントチューブ内に先端部を閉塞されて挿入される外管と、該外管と中心を一致させて前記外管の内側に配置された内管と、該内管に燃焼用空気を供給する空気供給管とを備えた空気予熱器において、前記外管の内面に金属線材が螺旋状に接触するように前記金属線材をコイルバネ状に曲げ加工してなる乱流発生体を、前記外管と前記内管との間に設けたことを特徴とする。   In order to achieve the above-mentioned object, the invention of claim 1 is directed to an outer tube inserted with a distal end closed in a radiant tube of a radiant tube combustion device, and the outer tube aligned with the center of the outer tube. In the air preheater comprising an inner pipe arranged inside and an air supply pipe for supplying combustion air to the inner pipe, the metal wire is spirally brought into contact with the inner surface of the outer pipe. A turbulent flow generator formed by bending a wire rod into a coil spring shape is provided between the outer tube and the inner tube.

請求項２の発明は、請求項１に記載の空気予熱器において、前記外管の内径と前記内管の外径との半径差に対して前記金属線材の直径を０．１〜０．３倍に設定したことを特徴とする。
請求項３の発明は、請求項１または２に記載の空気予熱器において、前記乱流発生体のコイルピッチが前記金属線材の直径に対して５〜２０倍となるように前記金属線材をコイルバネ状に曲げ加工したことを特徴とする。 According to a second aspect of the present invention, in the air preheater according to the first aspect, the diameter of the metal wire is 0.1 to 0.3 with respect to a radial difference between the inner diameter of the outer tube and the outer diameter of the inner tube. It is characterized by being set to double.
According to a third aspect of the present invention, in the air preheater according to the first or second aspect, the metal wire is a coil spring so that the coil pitch of the turbulent flow generator is 5 to 20 times the diameter of the metal wire. It is characterized by being bent into a shape.

請求項４の発明は、請求項１〜３のいずれか一項に記載の空気予熱器において、前記金属線材の両端部を捻った状態で前記乱流発生体を前記外管と前記内管との間に組み込んだことを特徴とする。
請求項５の発明は、請求項４に記載の空気予熱器において、前記金属線材の両端部を摘んで前記金属線材の両端部に捻り力を加えるための摘み部を前記金属線材の両端部に設けたことを特徴とする。
請求項６の発明は、請求項５に記載の空気予熱器において、前記金属線材の両端部を前記乱流発生体の内径側に折り曲げて前記摘み部を形成したことを特徴とする。 Invention of Claim 4 is the air preheater as described in any one of Claims 1-3. WHEREIN: The said turbulent flow generation body in the state which twisted the both ends of the said metal wire, the said outer tube, the said inner tube, It is characterized by being incorporated in between.
According to a fifth aspect of the present invention, there is provided the air preheater according to the fourth aspect of the present invention, wherein both ends of the metal wire are provided with knobs for pinching both ends of the metal wire and applying a twisting force to both ends of the metal wire. It is provided.
A sixth aspect of the present invention is the air preheater according to the fifth aspect, characterized in that the knob portion is formed by bending both end portions of the metal wire to the inner diameter side of the turbulent flow generator.

請求項１の発明によれば、空気供給管から内管に供給された燃焼用空気が外管と内管との間に形成された空気予熱路に流入すると、乱流発生体の乱流発生作用により乱流を発生させながら空気予熱路を流通する。従って、燃焼用空気が空気予熱路を層流となって流れる場合と比較して、燃焼ガスと燃焼用空気との熱交換効率を高めることができ、ラジアントチューブから排出される燃焼ガスの顕熱により燃焼用空気を効率的に予熱することができる。また、燃焼用空気と熱交換した燃焼ガスが空気予熱器の下流側に配置された燃料予熱器に高温のまま供給されることがないので、空気予熱器から排出された燃焼ガスによって燃料ガスが過度に予熱されることを防止することもできる。   According to the first aspect of the present invention, when the combustion air supplied from the air supply pipe to the inner pipe flows into the air preheating path formed between the outer pipe and the inner pipe, the turbulence generator generates turbulent flow. It circulates through the air preheating path while generating turbulent flow by action. Therefore, the heat exchange efficiency between the combustion gas and the combustion air can be increased compared with the case where the combustion air flows in a laminar flow through the air preheating path, and the sensible heat of the combustion gas discharged from the radiant tube is increased. Thus, the combustion air can be efficiently preheated. In addition, since the combustion gas heat-exchanged with the combustion air is not supplied at a high temperature to the fuel preheater disposed downstream of the air preheater, the fuel gas is discharged by the combustion gas discharged from the air preheater. It is also possible to prevent excessive preheating.

請求項２の発明によれば、外管の内径と内管の外径との半径差に対して金属線材の直径が０．１倍未満の場合や０．３倍より大きい場合と比較して、燃焼ガスと燃焼用空気との熱交換効率を高めることができる。従って、ラジアントチューブから排出される燃焼ガスの顕熱により燃焼用空気をより効率的に予熱することができる。
請求項３の発明によれば、金属線材からなる乱流発生体のコイルピッチが金属線材の直径に対して５倍未満の場合や２０倍より大きい場合と比較して、燃焼ガスと燃焼用空気との熱交換効率を高めることができる。従って、ラジアントチューブから排出される燃焼ガスの顕熱により燃焼用空気をより効率的に予熱することができる。 According to invention of Claim 2, compared with the case where the diameter of a metal wire is less than 0.1 times or larger than 0.3 times with respect to the radial difference of the inner diameter of an outer tube, and the outer diameter of an inner tube. The heat exchange efficiency between the combustion gas and the combustion air can be increased. Therefore, the combustion air can be preheated more efficiently by the sensible heat of the combustion gas discharged from the radiant tube.
According to invention of Claim 3, compared with the case where the coil pitch of the turbulent flow body which consists of metal wires is less than 5 times or more than 20 times with respect to the diameter of a metal wire, combustion gas and combustion air The heat exchange efficiency with can be increased. Therefore, the combustion air can be preheated more efficiently by the sensible heat of the combustion gas discharged from the radiant tube.

請求項４の発明によれば、乱流発生体の外径を外管の内径より小さくした状態で外管と内管との間に乱流発生体を組み込むことができ、従って、乱流発生体がコイルバネ状に曲げ加工された金属線材から形成されていても外管と内管との間に乱流発生体を容易に組み込むことができる。
請求項５の発明によれば、外管と内管との間に乱流発生体を組み込む際にペンチなどの摘み工具を用いて金属線材の両端部に捻り力を加えることができ、外管と内管との間に乱流発生体をより容易に組み込むことができる。
請求項６の発明によれば、金属線材の両端部に金属片を溶接接合して摘み部を形成した場合と比較して、高温環境下での使用が長期にわたっても摘み部が金属線材の両端部から脱落することを防止することができる。 According to the invention of claim 4, the turbulent flow generator can be incorporated between the outer tube and the inner tube in a state where the outer diameter of the turbulent flow generator is smaller than the inner diameter of the outer tube. Even if the body is formed of a metal wire bent into a coil spring shape, the turbulent flow generator can be easily incorporated between the outer tube and the inner tube.
According to the invention of claim 5, when incorporating a turbulent flow generator between the outer tube and the inner tube, a twisting force can be applied to both ends of the metal wire using a pinching tool such as pliers. A turbulent flow generator can be more easily incorporated between the inner pipe and the inner pipe.
According to invention of Claim 6, compared with the case where a metal piece is welded and joined to both ends of the metal wire to form a knob, the knob is used at both ends of the metal wire even when used in a high temperature environment for a long time. It can be prevented from falling off the part.

本発明の一実施形態に係る空気予熱器の構造を示す図である。It is a figure which shows the structure of the air preheater which concerns on one Embodiment of this invention. 図１に示す乱流発生体の一例を示す図である。It is a figure which shows an example of the turbulent flow generator shown in FIG. 図１に示す外管の内径と内管の外径との半径差に対する金属線材の直径比と空気予熱器の熱回収増加割合との関係を示す図である。It is a figure which shows the relationship between the diameter ratio of a metal wire with respect to the radial difference of the internal diameter of the outer tube shown in FIG. 1, and the outer diameter of an inner tube, and the heat recovery increase rate of an air preheater. 図１に示す乱流発生体のコイルピッチ比と空気予熱器の熱回収増加割合との関係を調査した結果を示す図である。It is a figure which shows the result of having investigated the relationship between the coil pitch ratio of the turbulent flow body shown in FIG. 1, and the heat recovery increase rate of an air preheater. 図１に示す乱流発生体の他の例を示す図である。It is a figure which shows the other example of the turbulent flow generator shown in FIG.

以下、図面を参照して本発明に係る空気予熱器について説明する。
図１は、本発明の一実施形態に係る空気予熱器の構造を示す図である。図１に示される空気予熱器１０はラジアントチューブ式燃焼装置のラジアントチューブ１１から排出される燃焼ガス１２の顕熱を回収して燃焼用空気１３を予熱するものであって、外管１４、内管１６、空気供給管１８及び乱流発生体１９を備えている。 Hereinafter, an air preheater according to the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a structure of an air preheater according to an embodiment of the present invention. An air preheater 10 shown in FIG. 1 recovers sensible heat of a combustion gas 12 discharged from a radiant tube 11 of a radiant tube type combustion apparatus and preheats combustion air 13. A pipe 16, an air supply pipe 18, and a turbulent flow generator 19 are provided.

外管１４は、その先端部がドーム状の外管先端部閉塞部材１５により閉塞されている。また、外管１４は熱伝導性の良好な金属からなり、ラジアントチューブ１１の燃焼ガス排出側端部からラジアントチューブ１１内に挿入されている。
内管１６は外管１４との間に空気予熱路１７を形成するものであって、外管１４と中心を一致させて外管１４の内側に配置されている。 The outer tube 14 is closed at its distal end by a dome-shaped outer tube distal end blocking member 15. The outer tube 14 is made of a metal having good thermal conductivity, and is inserted into the radiant tube 11 from the combustion gas discharge side end of the radiant tube 11.
The inner pipe 16 forms an air preheating path 17 between the inner pipe 16 and the inner pipe 16 and is arranged inside the outer pipe 14 so as to coincide with the outer pipe 14 at the center.

空気供給管１８は内管１６に燃焼用空気１３を供給するものであって、この空気供給管１８から内管１６に供給された燃焼用空気１３は、内管１６の内側を流通した後、外管１４の先端側でＵターンし、外管１４と内管１６との間に形成された空気予熱路１７に流入するようになっている。そして、空気予熱路１７を流通した後、ラジアントチューブ式燃焼装置のバーナ（図示）に供給されるようになっている。   The air supply pipe 18 supplies combustion air 13 to the inner pipe 16, and the combustion air 13 supplied from the air supply pipe 18 to the inner pipe 16 circulates inside the inner pipe 16, A U-turn is made at the distal end side of the outer tube 14 and flows into an air preheating path 17 formed between the outer tube 14 and the inner tube 16. And after distribute | circulating the air preheating path 17, it is supplied to the burner (illustration) of a radiant tube type combustion apparatus.

乱流発生体１９は空気予熱路１７を流通する燃焼用空気１３に乱流を発生させるためのものであって、外管１４と内管１６との間に設けられている。また、乱流発生体１９は１本の金属線材２０からなり、この金属線材２０が外管１４の内面に螺旋状に接触するように金属線材２０をコイルバネ状に曲げ加工して形成されている。
乱流発生体１９の金属線材２０は、その直径が外管１４の内径と内管１６の外径との半径差（（ｄ１−ｄ２）／２）に対して０．１〜０．３倍、好ましくは０．１〜０．２５倍に設定されている。また、金属線材２０は乱流発生体１９のコイルピッチが金属線材２０の直径に対して５〜２０倍、好ましくは７〜１５倍となるようにコイルバネ状に曲げ加工され、乱流発生体１９はコイルバネ状に曲げ加工された金属線材２０の両端部を捻った状態で外管１４と内管１６との間に組み込まれている。 The turbulent flow generator 19 is for generating turbulent flow in the combustion air 13 flowing through the air preheating path 17 and is provided between the outer tube 14 and the inner tube 16. The turbulent flow generator 19 is composed of a single metal wire 20, and is formed by bending the metal wire 20 into a coil spring shape so that the metal wire 20 comes into spiral contact with the inner surface of the outer tube 14. .
The diameter of the metal wire 20 of the turbulent flow generator 19 is 0.1 to 0. 0 relative to the radius difference ((d 1 -d 2 ) / 2) between the inner diameter of the outer tube 14 and the outer diameter of the inner tube 16. It is set to 3 times, preferably 0.1 to 0.25 times. Further, the metal wire 20 is bent into a coil spring shape so that the coil pitch of the turbulence generator 19 is 5 to 20 times, preferably 7 to 15 times the diameter of the metal wire 20, and the turbulence generator 19 Is incorporated between the outer tube 14 and the inner tube 16 with both ends of the metal wire 20 bent into a coil spring being twisted.

図２は図１に示す乱流発生体の一例を示す図であり、図２に示される乱流発生体１９は、金属線材２０の両端部に摘み部２１ａ，２１ｂを有している。これらの摘み部２１ａ，２１ｂはペンチなどの摘み工具で金属線材２０の両端部を摘んで金属線材２０の両端部に捻り力を加えるためのものであって、板状の金属片を金属線材２０の両端部に溶接接合して形成されている。   FIG. 2 is a diagram showing an example of the turbulent flow generator shown in FIG. 1. The turbulent flow generator 19 shown in FIG. 2 has knobs 21 a and 21 b at both ends of the metal wire 20. These knobs 21a and 21b are for pinching both ends of the metal wire 20 with a knob tool such as pliers and applying a twisting force to both ends of the metal wire 20, and the plate-like metal piece is made of the metal wire 20 It is formed by welding and joining to both ends.

上記のように構成される空気予熱器１０では、空気供給管１８から内管１６に供給された燃焼用空気１３が外管１４と内管１６との間に形成された空気予熱路１７に流入すると、乱流発生体１９の乱流発生作用によりスパイラル状の乱流を発生させながら空気予熱路１７を流通する。従って、燃焼用空気１３が空気予熱路１７を層流となって流れる場合と比較して、燃焼ガス１２と燃焼用空気１３との熱交換効率を高めることができ、ラジアントチューブ１１から排出される燃焼ガス１２の顕熱により燃焼用空気１３を効率的に予熱することができる。   In the air preheater 10 configured as described above, the combustion air 13 supplied from the air supply pipe 18 to the inner pipe 16 flows into the air preheating path 17 formed between the outer pipe 14 and the inner pipe 16. Then, the air preheating path 17 is circulated while generating a spiral turbulent flow by the turbulent flow generating action of the turbulent flow generating body 19. Therefore, the heat exchange efficiency between the combustion gas 12 and the combustion air 13 can be increased and discharged from the radiant tube 11 as compared with the case where the combustion air 13 flows in the air preheating path 17 as a laminar flow. The combustion air 13 can be efficiently preheated by the sensible heat of the combustion gas 12.

また、燃焼用空気１３と熱交換した燃焼ガス１２が空気予熱器１０の下流側に配置された燃料予熱器に高温のまま供給されることがないので、空気予熱器１０から排出された燃焼ガス１２によって燃料ガスが過度に予熱されることを防止することもできる。
さらに、金属線材２０の両端部に捻った状態で乱流発生体１９を外管１４と内管１６との間に組み込むことで、乱流発生体１９の外径を外管１４の内径より小さくした状態で外管１４と内管１６との間に乱流発生体１９を組み込むことができる。従って、乱流発生体１９がコイルバネ状に曲げ加工された金属線材２０から形成されていても外管１４と内管１６との間に乱流発生体１９を容易に組み込むことができる。 Further, since the combustion gas 12 exchanged with the combustion air 13 is not supplied at a high temperature to the fuel preheater disposed downstream of the air preheater 10, the combustion gas discharged from the air preheater 10. 12 can also prevent the fuel gas from being preheated excessively.
Further, the outer diameter of the turbulent flow generator 19 is made smaller than the inner diameter of the outer tube 14 by incorporating the turbulent flow generator 19 between the outer tube 14 and the inner tube 16 while being twisted at both ends of the metal wire 20. In this state, a turbulent flow generator 19 can be incorporated between the outer tube 14 and the inner tube 16. Therefore, even if the turbulent flow generator 19 is formed from the metal wire 20 bent into a coil spring shape, the turbulent flow generator 19 can be easily incorporated between the outer tube 14 and the inner tube 16.

また、図２に示すように、ペンチなどの摘み工具で金属線材２０の両端部を摘んで金属線材２０の両端部に捻り力を加えるための摘み部２１ａ，２１ｂを金属線材２０の両端部に設けることで、外管１４と内管１６との間に乱流発生体１９を組み込む際にペンチなどの摘み工具を用いて金属線材２０の両端部に捻り力を加えることができ、従って、外管１４と内管１６との間に乱流発生体１９をより容易に組み込むことができる。   Further, as shown in FIG. 2, knobs 21 a and 21 b for picking both ends of the metal wire 20 with a knob tool such as pliers and applying a twisting force to both ends of the metal wire 20 are provided at both ends of the metal wire 20. Thus, when the turbulent flow generator 19 is assembled between the outer tube 14 and the inner tube 16, a twisting force can be applied to both ends of the metal wire 20 using a pinching tool such as pliers. The turbulence generator 19 can be more easily incorporated between the tube 14 and the inner tube 16.

本発明者らは、外管１４の内径と内管１６の外径との半径差に対する金属線材２０の直径比と空気予熱器１０の熱回収増加割合との関係を調査した。その結果を図３に示す。
図３に示されるように、外管１４の内径ｄ１と内管１６の外径ｄ２との半径差（（ｄ１−ｄ２）／２）に対する金属線材２０の直径比ＲＤが０．１未満になると、空気予熱器１０の熱回収増加割合が１０％以下になることがわかる。また、外管１４の内径ｄ１と内管１６の外径ｄ２との半径差（（ｄ１−ｄ２）／２）に対する金属線材２０の直径比ＲＤが０．３より大きくなると、空気予熱器１０の熱回収増加割合が１０％以下になることがわかる。 The inventors investigated the relationship between the diameter ratio of the metal wire 20 and the heat recovery increase rate of the air preheater 10 with respect to the radial difference between the inner diameter of the outer tube 14 and the outer diameter of the inner tube 16. The result is shown in FIG.
As shown in FIG. 3, the diameter ratio RD of the metal wire 20 with respect to the radius difference ((d 1 -d 2 ) / 2) between the inner diameter d 1 of the outer tube 14 and the outer diameter d 2 of the inner tube 16 is 0. When the ratio is less than 0.1, the heat recovery increase rate of the air preheater 10 is 10% or less. Further, when the diameter ratio RD of the metal wire 20 to the radius difference ((d 1 −d 2 ) / 2) between the inner diameter d 1 of the outer tube 14 and the outer diameter d 2 of the inner tube 16 is larger than 0.3, It can be seen that the heat recovery increase rate of the air preheater 10 is 10% or less.

従って、上述した本実施形態のように、外管１４の内径と内管１６の外径との半径差に対して金属線材２０の直径を０．１〜０．３倍、好ましくは０．１〜０．２５倍に設定することで、金属線材２０の直径が外管１４の内径と内管１６の外径との半径差に対して０．１未満の場合や０．３より大きい場合と比較して、ラジアントチューブ１１から排出される燃焼ガス１２の顕熱により燃焼用空気１３をより効率的に予熱することができる。   Accordingly, as in the present embodiment described above, the diameter of the metal wire 20 is 0.1 to 0.3 times, preferably 0.1, with respect to the radial difference between the inner diameter of the outer tube 14 and the outer diameter of the inner tube 16. By setting to 0.25 times, the diameter of the metal wire 20 is less than 0.1 or greater than 0.3 with respect to the radial difference between the inner diameter of the outer tube 14 and the outer diameter of the inner tube 16 In comparison, the combustion air 13 can be preheated more efficiently by the sensible heat of the combustion gas 12 discharged from the radiant tube 11.

また、本発明者らは、金属線材２０の直径に対する乱流発生体１９のコイルピッチ比と空気予熱器１０の熱回収増加割合との関係を調査した。その結果を図４に示す。
図４に示されるように、金属線材２０の直径ｄ３に対する乱流発生体１９のコイルピッチ比ＲＣＰが５未満になると、空気予熱器１０の熱回収増加割合が１０％以下になることがわかる。また、金属線材２０の直径ｄ３に対する乱流発生体１９のコイルピッチ比ＲＣＰが２０より大きくなると、空気予熱器１０の熱回収増加割合が１０％以下になることがわかる。 In addition, the present inventors investigated the relationship between the coil pitch ratio of the turbulent flow generator 19 with respect to the diameter of the metal wire 20 and the heat recovery increase rate of the air preheater 10. The result is shown in FIG.
As shown in FIG. 4, when the coil pitch ratio R CP of the turbulent flow generator 19 with respect to the diameter d 3 of the metal wire 20 is less than 5, the heat recovery increase rate of the air preheater 10 may be 10% or less. Recognize. It can also be seen that when the coil pitch ratio R CP of the turbulent flow generator 19 to the diameter d 3 of the metal wire 20 is greater than 20, the heat recovery increase rate of the air preheater 10 becomes 10% or less.

従って、上述した本実施形態のように、金属線材２０からなる乱流発生体１９のコイルピッチが金属線材２０の直径の５〜２０倍、好ましくは７〜１５倍となるように金属線材２０をコイルバネ状に曲げ加工することで、乱流発生体１９のコイルピッチが金属線材２０の直径に対して５未満の場合や２０より大きい場合と比較して、ラジアントチューブ１１から排出される燃焼ガス１２の顕熱により燃焼用空気１３をより効率的に予熱することができる。   Therefore, as in the above-described embodiment, the metal wire 20 is arranged so that the coil pitch of the turbulent flow generator 19 made of the metal wire 20 is 5 to 20 times, preferably 7 to 15 times the diameter of the metal wire 20. By bending into a coil spring shape, the combustion gas 12 discharged from the radiant tube 11 is compared to the case where the coil pitch of the turbulent flow generator 19 is less than 5 or greater than 20 with respect to the diameter of the metal wire 20. By this sensible heat, the combustion air 13 can be preheated more efficiently.

図５は図１に示す乱流発生体の他の例を示す図であり、図５に示される乱流発生体１９が図２に示したものと異なる点は、金属線材２０の両端部を乱流発生体１９の内径側に折り曲げて摘み部２１ａ，２１ｂを形成した点である。
このように、金属線材２０の両端部を乱流発生体１９の内径側に折り曲げて摘み部２１ａ，２１ｂを形成すると、金属線材２０の両端部に金属片を溶接接合して摘み部２１ａ，２１ｂを形成した場合と比較して、高温環境下で長期にわたって使用しても摘み部２１ａ，２１ｂが金属線材２０の両端部から脱落することを防止することができる。 FIG. 5 is a view showing another example of the turbulent flow generator shown in FIG. 1. The turbulent flow generator 19 shown in FIG. 5 is different from that shown in FIG. This is the point where the knobs 21a and 21b are formed by bending toward the inner diameter side of the turbulent flow generator 19.
In this way, when both ends of the metal wire 20 are bent toward the inner diameter side of the turbulent flow generator 19 to form the knobs 21a and 21b, metal pieces are welded to both ends of the metal wire 20 and the knobs 21a and 21b are joined. Compared with the case of forming, the knobs 21a and 21b can be prevented from falling off from both ends of the metal wire 20 even when used for a long time in a high temperature environment.

１０…空気予熱器
１１…ラジアントチューブ
１２…燃焼ガス
１３…燃焼用空気
１４…外管
１５…外管先端部閉塞部材
１６…内管
１７…空気予熱路
１８…空気供給管
１９…乱流発生体
２０…金属線材
２１ａ，２１ｂ…摘み部
DESCRIPTION OF SYMBOLS 10 ... Air preheater 11 ... Radiant tube 12 ... Combustion gas 13 ... Combustion air 14 ... Outer pipe 15 ... Outer pipe front-end | tip block member 16 ... Inner pipe 17 ... Air preheating path 18 ... Air supply pipe 19 ... Turbulence generator 20 ... metal wire 21a, 21b ... knob

Claims (6)

ラジアントチューブ式燃焼装置のラジアントチューブ内に先端部を閉塞されて挿入される外管と、該外管と中心を一致させて前記外管の内側に配置された内管と、該内管に燃焼用空気を供給する空気供給管とを備えた空気予熱器において、
前記外管の内面に金属線材が螺旋状に接触するように前記金属線材をコイルバネ状に曲げ加工してなる乱流発生体を、前記外管と前記内管との間に設けたことを特徴とする空気予熱器。 An outer tube that is inserted with a distal end closed in the radiant tube of the radiant tube combustion device, an inner tube that is arranged inside the outer tube with the outer tube aligned with the center, and burns in the inner tube In an air preheater comprising an air supply pipe for supplying industrial air,
A turbulent flow generator formed by bending the metal wire into a coil spring shape so that the metal wire comes into spiral contact with the inner surface of the outer tube is provided between the outer tube and the inner tube. Air preheater. 請求項１に記載の空気予熱器において、前記外管の内径と前記内管の外径との半径差に対して前記金属線材の直径を０．１〜０．３倍に設定したことを特徴とする空気予熱器。   The air preheater according to claim 1, wherein the diameter of the metal wire is set to 0.1 to 0.3 times the radial difference between the inner diameter of the outer tube and the outer diameter of the inner tube. Air preheater. 請求項１または２に記載の空気予熱器において、前記乱流発生体のコイルピッチが前記金属線材の直径に対して５〜２０倍となるように前記金属線材をコイルバネ状に曲げ加工したことを特徴とする空気予熱器。   The air preheater according to claim 1 or 2, wherein the metal wire is bent into a coil spring shape so that the coil pitch of the turbulent flow generator is 5 to 20 times the diameter of the metal wire. Features an air preheater. 請求項１〜３のいずれか一項に記載の空気予熱器において、前記金属線材の両端部を捻った状態で前記乱流発生体を前記外管と前記内管との間に組み込んだことを特徴とする空気予熱器。   The air preheater according to any one of claims 1 to 3, wherein the turbulent flow generator is incorporated between the outer tube and the inner tube in a state where both ends of the metal wire are twisted. Features an air preheater. 請求項４に記載の空気予熱器において、前記金属線材の両端部を摘んで前記金属線材の両端部に捻り力を加えるための摘み部を前記金属線材の両端部に設けたことを特徴とする空気予熱器。   5. The air preheater according to claim 4, wherein the both ends of the metal wire are provided with knobs for pinching both ends of the metal wire and applying a twisting force to both ends of the metal wire. Air preheater. 請求項５に記載の空気予熱器において、前記金属線材の両端部を前記乱流発生体の内径側に折り曲げて前記摘み部を形成したことを特徴とする空気予熱器。   6. The air preheater according to claim 5, wherein the knob is formed by bending both ends of the metal wire to the inner diameter side of the turbulent flow generator.
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Publication number Priority date Publication date Assignee Title
CN105333451A (en) * 2015-11-25 2016-02-17 中国能源建设集团广东省电力设计研究院有限公司 Cold air feeding device for air preheater of thermal power plant
JP2022519625A (en) * 2019-02-05 2022-03-24 イーエスエー ソチエタ ペル アチオーニ Burner assembly with radiant tube heat exchanger
CN115200014A (en) * 2022-07-01 2022-10-18 北京兴达奇热工控制设备有限公司 Air-gas double-preheating blast furnace gas radiation pipe combustion system

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CN105333451A (en) * 2015-11-25 2016-02-17 中国能源建设集团广东省电力设计研究院有限公司 Cold air feeding device for air preheater of thermal power plant
JP2022519625A (en) * 2019-02-05 2022-03-24 イーエスエー ソチエタ ペル アチオーニ Burner assembly with radiant tube heat exchanger
JP7358489B2 (en) 2019-02-05 2023-10-10 イーエスエー ソチエタ ペル アチオーニ Burner assembly with radiant tube heat exchanger
CN115200014A (en) * 2022-07-01 2022-10-18 北京兴达奇热工控制设备有限公司 Air-gas double-preheating blast furnace gas radiation pipe combustion system

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