JP4820772B2 - High temperature air heater lid mounting structure - Google Patents

High temperature air heater lid mounting structure Download PDF

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JP4820772B2
JP4820772B2 JP2007087057A JP2007087057A JP4820772B2 JP 4820772 B2 JP4820772 B2 JP 4820772B2 JP 2007087057 A JP2007087057 A JP 2007087057A JP 2007087057 A JP2007087057 A JP 2007087057A JP 4820772 B2 JP4820772 B2 JP 4820772B2
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outer tube
temperature air
peripheral surface
air heater
lid
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JP2008249156A (en
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政雄 難波
修二 石原
宏 大竹
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Mitsui Engineering and Shipbuilding Co Ltd
Mitsui E&S Holdings Co Ltd
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Mitsui Engineering and Shipbuilding Co Ltd
Mitsui E&S Holdings Co Ltd
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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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Description

本発明は、高温空気加熱器の蓋取付構造に係り、特に、高温空気加熱器の密封性を向上させるための蓋取付構造の改良技術に関する。   The present invention relates to a lid mounting structure for a high-temperature air heater, and more particularly to an improved technique for a lid mounting structure for improving the sealing performance of a high-temperature air heater.

都市ごみや産業廃棄物などの処理法として、例えば、廃棄物を熱分解反応器で熱分解し、生成された熱分解ガスと熱分解残渣の一部を燃焼溶融炉に導いて燃焼処理する方法が知られており、燃焼排ガスの流路内に配置される高温空気加熱器により伝熱管内を流れる低温の被加熱空気を高温の燃焼排ガスと熱交換して熱回収することが行われている。ここで回収された熱は、例えば、熱分解の熱源として利用される。   As a treatment method for municipal waste, industrial waste, etc., for example, a method in which waste is pyrolyzed in a pyrolysis reactor, and a part of the generated pyrolysis gas and pyrolysis residue is led to a combustion melting furnace for combustion treatment It is known that heat is recovered by exchanging heat between low-temperature heated air flowing in the heat transfer tubes with high-temperature combustion exhaust gas by a high-temperature air heater disposed in the flow path of the combustion exhaust gas. . The heat recovered here is used as a heat source for thermal decomposition, for example.

ところで、このような廃棄物を燃焼させて発生する高温の燃焼排ガスは、廃棄物に起因した塩素や塩化水素などの腐食性物質を含むことから、金属製の伝熱管を露出させた状態で用いることはできない。そのため、例えば、金属製の内管などを耐火材の外管と底蓋により覆って封止した多重管構造が採用されている。   By the way, the high-temperature combustion exhaust gas generated by burning such waste contains corrosive substances such as chlorine and hydrogen chloride caused by the waste, and is used in a state where the metal heat transfer tube is exposed. It is not possible. Therefore, for example, a multi-tube structure in which a metal inner tube or the like is covered and sealed with an outer tube of a refractory material and a bottom cover is employed.

本出願人は、燃焼排ガスの流路内に天井から吊り下げられて内部に被加熱空気が流れる金属製の内管と、この内管を包囲して設けられ、内管との間に被加熱空気の流路を形成する耐火性の外管と、内管の下方に連結されて外管を支持する平板状の受け金物とを備えた２重管構造の高温空気加熱器を提案している（例えば、特許文献１参照。）。   The present applicant is provided with a metal inner pipe that is suspended from the ceiling in the flue gas flow path and through which heated air flows and surrounds the inner pipe, and is heated between the inner pipe and the inner pipe. A high-temperature air heater having a double pipe structure including a fire-resistant outer tube that forms an air flow path and a flat plate-shaped metal fitting that is connected to the lower side of the inner tube and supports the outer tube is proposed. (For example, refer to Patent Document 1).

この高温空気加熱器は、外管の下方に受け金物よりも大径の開口を有する筒状部を形成し、その筒状部の開口端に耐火性の底蓋を嵌合させて封止する構造となっている。底蓋は、筒状部の開口端と突き当たる円盤状の基部と、その基部の一側面に形成されて径方向に突出する係止突起とを備え、筒状部の内周には、係止突起が差し込まれる係止溝が開口端から軸方向と軸線上に形成されている。   This high-temperature air heater is formed by forming a cylindrical portion having an opening larger in diameter than the metal fitting below the outer tube, and fitting and sealing a fire-resistant bottom lid on the opening end of the cylindrical portion. It has a structure. The bottom cover includes a disk-shaped base portion that abuts the opening end of the cylindrical portion, and a locking protrusion that is formed on one side surface of the base portion and protrudes in the radial direction. A locking groove into which the protrusion is inserted is formed in the axial direction and on the axis line from the opening end.

これによれば、底蓋を筒状部に差し込んで所定の回転を施すことにより、底蓋を筒状部に容易に取りつけることができ、このようにして内管と受け金物を封止することにより酸化腐食を抑制することができる。   According to this, the bottom lid can be easily attached to the cylindrical portion by inserting the bottom lid into the cylindrical portion and performing a predetermined rotation, and thus sealing the inner tube and the metal fitting. Thus, oxidative corrosion can be suppressed.

特開２００６−２６６５４０号公報JP 2006-266540 A

ところで、特許文献１の底蓋の取付構造においては、外管（筒状部）と底蓋との間に、耐熱モルタルやセラミック製シート材などの耐熱シール材を介在させて密封性を高めるようにしている。しかし、このシール構造は、筒状部の開口端が底蓋と突き当たる周状の領域にしか設けることができないため、燃焼排ガスの侵入に対する抵抗を長期間に渡って安定的に維持するには、十分なものとはいえない。そのため、シール幅をさらに増加させた底蓋の取付構造が求められている。   By the way, in the mounting structure of the bottom cover of Patent Document 1, a heat-resistant sealing material such as a heat-resistant mortar or a ceramic sheet material is interposed between the outer tube (cylindrical portion) and the bottom cover so as to improve the sealing performance. I have to. However, since this seal structure can be provided only in the circumferential region where the open end of the cylindrical portion abuts against the bottom lid, in order to stably maintain the resistance to intrusion of combustion exhaust gas over a long period of time, It's not enough. Therefore, there is a demand for a bottom cover mounting structure that further increases the seal width.

本発明は、高い密封性を長期間に渡って維持することができる高温空気加熱器の底蓋の取付構造を提供することを課題とする。   An object of the present invention is to provide a mounting structure for a bottom cover of a high-temperature air heater that can maintain high sealing performance over a long period of time.

本発明は、上記課題を解決するため、燃焼排ガスの流路内に吊り下げられて設置される高温空気加熱器の外壁を形成する耐火性外管の開口端に蓋体を嵌合させて耐火性外管を封止する高温空気加熱器の蓋取付構造において、蓋体は、開口端が当接する基部の当接面から突出して耐火性外管の内周面と嵌合する円柱状の胴部と、この胴部の端面に形成されて胴部の外周面よりも外側に突出する一対の係止突起とを備え、耐火性外管には、係止突起が差し込まれる係止溝が開口端から内周面の軸方向と軸線周りに形成されてなり、蓋体を耐火性外管に差し込んで軸線周りに回転させた状態で、耐火性外管の開口端と基部の当接面との間、及び、耐火性外管の内周面と前記胴部の外周面との間に、耐火性シール材を介在させてなることを特徴としている。   In order to solve the above-mentioned problems, the present invention provides a fireproof by fitting a lid to the open end of a refractory outer pipe that forms the outer wall of a high-temperature air heater that is suspended and installed in a flow path of combustion exhaust gas. In the lid mounting structure for a high-temperature air heater that seals the heat-resistant outer tube, the lid body protrudes from the contact surface of the base with which the opening end contacts, and is a cylindrical body that fits with the inner peripheral surface of the fire-resistant outer tube And a pair of locking projections formed on the end surface of the body portion and projecting outward from the outer peripheral surface of the body portion, and a locking groove into which the locking projection is inserted is opened in the refractory outer tube. It is formed around the axial direction and the axial line from the end to the inner peripheral surface, and with the lid inserted into the refractory outer tube and rotated around the axial line, the opening end of the refractory outer tube and the contact surface of the base And a fire-resistant sealing material is interposed between the inner peripheral surface of the refractory outer tube and the outer peripheral surface of the body portion. That.

このように、蓋体に耐火性外管の内周面と嵌合する円柱状の胴部を形成することにより、開口端と基部の当接面との間の領域に加えて、耐火性外管の内周面と胴部の外周面との間にも、耐火性シール材を介在させることができるため、シール幅を増やすことができ、耐火性外管と蓋体による密封性を向上させることができる。これにより、燃焼排ガスの侵入に対する抵抗を長期間安定して持続することができるため、内管や受け金物などの酸化腐食を抑制し、高温空気加熱器の耐久性を向上させることができる。   Thus, in addition to the region between the opening end and the contact surface of the base, by forming a cylindrical body portion that fits the inner peripheral surface of the fire-resistant outer tube, Since a fireproof sealing material can be interposed between the inner peripheral surface of the tube and the outer peripheral surface of the body portion, the seal width can be increased, and the sealing performance by the fireproof outer tube and the lid is improved. be able to. As a result, the resistance against the intrusion of combustion exhaust gas can be stably maintained for a long period of time, so that the oxidative corrosion of the inner pipe and the metal fitting can be suppressed and the durability of the high-temperature air heater can be improved.

本発明によれば、外管と底蓋との間のシール幅を増やすことができるため、高い密封性を長期間に渡って維持することができる。   According to the present invention, since the seal width between the outer tube and the bottom cover can be increased, high sealing performance can be maintained over a long period of time.

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。図１は、本発明を適用してなる高温空気加熱器の一実施の形態を示す断面図である。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of a high-temperature air heater to which the present invention is applied.

本実施の形態の高温空気加熱器１は、金属製の内管３を外壁となる耐火性の外管５と底蓋７により被覆して形成され、例えば、内管３内から供給される被加熱空気ａ１を外管５内へ導くとともに、外管５を介して高温の燃焼排ガスＧと熱交換し、被加熱空気ａ１を加熱するものである。 The high-temperature air heater 1 according to the present embodiment is formed by covering a metal inner tube 3 with a fire-resistant outer tube 5 and a bottom lid 7 as outer walls. The heated air a 1 is guided into the outer pipe 5 and heat exchange is performed with the high-temperature combustion exhaust gas G through the outer pipe 5 to heat the heated air a 1 .

高温空気加熱器１は、燃焼排ガスの流路内に天井から吊り下げられる金属性の内管３と、その内管３を包囲して設けられる耐火性の外管５と、外管５の下方に形成され、外管５を下方から支持する受け金物９と、外管５の下端の開口を封止する底蓋７を備えて構成される。   The high-temperature air heater 1 includes a metallic inner tube 3 suspended from a ceiling in a combustion exhaust gas flow path, a fireproof outer tube 5 provided surrounding the inner tube 3, and a lower portion of the outer tube 5. And a bottom cover 7 that seals the opening at the lower end of the outer tube 5.

内管３の上部は、図示しない被加熱空気の入口管に連結される一方、下方の管側壁には通孔１１が設けられ、その通孔１１を介して、内管３内の風路１３と内管３と外管５との間に形成される風路１５とが連通するようになっている。内管３の下端には、円盤状の受け金物９が水平に固定されており、内管の開口端を封止するようになっている。   The upper part of the inner pipe 3 is connected to an inlet pipe for heated air (not shown), and a through hole 11 is provided in the lower pipe side wall, and the air passage 13 in the inner pipe 3 is provided through the through hole 11. And an air passage 15 formed between the inner tube 3 and the outer tube 5 communicate with each other. A disc-shaped receiving piece 9 is fixed horizontally at the lower end of the inner tube 3 so as to seal the open end of the inner tube.

外管５は、耐火性材料、例えば、セラミックスにより略円筒状に形成されたセラミックス管を同軸上に積み上げて形成され、その最上部は、図示しない被加熱空気の排出管に連結される一方、最下部は、セラミックス管の内径よりも大径の受け金物９により支持されている。これらのセラミックス管の内径は、高さ方向で均一になるように形成されているが、最下部のセラミックス管の下方には、受け金物９の外径よりも大径の開口を有する筒状部１７が一体的に形成されている。   The outer tube 5 is formed by coaxially stacking ceramic tubes formed in a substantially cylindrical shape with a refractory material, for example, ceramics, and the uppermost portion thereof is connected to a discharge pipe for heated air (not shown), The lowermost part is supported by a metal fitting 9 having a diameter larger than the inner diameter of the ceramic tube. The inner diameters of these ceramic tubes are formed so as to be uniform in the height direction, but a cylindrical portion having an opening larger than the outer diameter of the metal fitting 9 below the lowermost ceramic tube. 17 is integrally formed.

筒状部１７の開口端には、外管５と同じく、例えば、セラミックスで形成された底蓋７が取り付けられており、底蓋７と受け金物９との間には、空間１９が形成されている。   As with the outer tube 5, for example, a bottom lid 7 made of ceramics is attached to the opening end of the cylindrical portion 17, and a space 19 is formed between the bottom lid 7 and the metal fitting 9. ing.

図２は、本実施の形態の底蓋の形状の斜視図を（ａ）に示し、比較のため、従来の形状を（ｂ）に示す。同様に、図３は側面図を、図４は上面図を表している。   FIG. 2A shows a perspective view of the shape of the bottom lid of the present embodiment, and FIG. 2B shows a conventional shape for comparison. Similarly, FIG. 3 shows a side view and FIG. 4 shows a top view.

図に示すように、従来の底蓋は、略円柱状の基部２１と、その基部２１の一端面に突出して形成される胴部２３と、その胴部２３に対して基部２１と反対側の面に形成される係止部２５とを備えて構成される。胴部２３及び係止部２５は、外径が異なる二つの円柱を基部２１と同軸に重ねて配置するとともに、その軸芯を中心とする平行な一組の共通の側面を備えて形成される。そして、係止部２５の外径は、胴部２３の外径よりも大きく基部２１の外径よりも小さく形成されている。また、係止部２５には、胴部２３の外周面よりも外側に突出する一対の係止突起２６が形成されている。   As shown in the figure, the conventional bottom cover includes a substantially columnar base 21, a body part 23 formed to project from one end surface of the base part 21, and a base part 21 opposite to the base part 21. And a locking portion 25 formed on the surface. The body portion 23 and the locking portion 25 are formed by arranging two cylinders having different outer diameters so as to be coaxially overlapped with the base portion 21 and having a set of parallel common sides centered on the axis. . The outer diameter of the locking portion 25 is larger than the outer diameter of the body portion 23 and smaller than the outer diameter of the base portion 21. In addition, the locking portion 25 is formed with a pair of locking projections 26 that protrude outward from the outer peripheral surface of the body portion 23.

これに対し、本実施の形態の底蓋７は、従来の底蓋と同様、略円柱状の基部２７と、その基部２７の一端面に突出して形成される胴部２９と、その胴部２９に対して基部２７と反対側に形成される係止部３１とを備えて構成されるが、胴部２９が円柱状に形成されている点で、従来の底蓋と相違している。すなわち、底蓋７には、胴部２９に軸芯を中心とする平行な一組の側面が形成されていない。また、係止部３１には、胴部２９の外周面よりも外側に突出する一対の係止突起３３が形成されている。   On the other hand, the bottom lid 7 of the present embodiment, like the conventional bottom lid, has a substantially cylindrical base portion 27, a body portion 29 formed to project from one end surface of the base portion 27, and the body portion 29. However, it is different from the conventional bottom lid in that the body portion 29 is formed in a columnar shape. In other words, the bottom cover 7 is not formed with a pair of parallel side surfaces centered on the axial center of the body portion 29. In addition, the locking portion 31 is formed with a pair of locking projections 33 protruding outward from the outer peripheral surface of the body portion 29.

一方、筒状部１７の内周面には、係止突起３３が差し込まれる係止溝が開口端から軸方向と軸線周りに形成されており、その内周面には、底蓋７の胴部２９が嵌合するようになっている。   On the other hand, a locking groove into which the locking projection 33 is inserted is formed on the inner peripheral surface of the cylindrical portion 17 in the axial direction and around the axis line from the opening end. The part 29 is adapted to be fitted.

このようにして構成される底蓋７は、まず、図２（ａ）に示すように、基部２７の一端面に、耐熱シール材３５、例えば、セラミックス製シートや耐熱モルタルなどが周状に施工される。また胴部２９の外周面全体にも耐熱シール材３５が施工される。   As shown in FIG. 2 (a), the bottom lid 7 constructed in this way is first constructed on one end face of the base 27 with a heat-resistant sealing material 35, for example, a ceramic sheet or heat-resistant mortar in a circumferential shape. Is done. Further, the heat-resistant sealing material 35 is also applied to the entire outer peripheral surface of the body portion 29.

耐熱シール材３５が施工された底蓋７は、係止突起３３が係止溝に嵌め込まれた状態で筒状部１７の開口端から差し込まれる。そして底蓋７を所定量回転させることにより係止突起３３が軸線方向の係止溝に係止されて固定される。これにより、底蓋７は、基部２７の一端面が全周に渡って耐熱シール材３５を介在させた状態で、筒状部１７の開口端に押し付けられるとともに、胴部２９は筒状部１７の内周面と耐熱シール材３５を介して嵌合された状態となる。   The bottom lid 7 on which the heat-resistant sealing material 35 is applied is inserted from the opening end of the tubular portion 17 in a state where the locking projection 33 is fitted in the locking groove. Then, by rotating the bottom lid 7 by a predetermined amount, the locking projection 33 is locked and fixed in the locking groove in the axial direction. As a result, the bottom lid 7 is pressed against the open end of the cylindrical portion 17 with the one end surface of the base portion 27 interposing the heat-resistant sealing material 35 over the entire circumference, and the body portion 29 is pressed against the cylindrical portion 17. It will be in the state fitted with the inner peripheral surface of this through the heat-resistant sealing material 35.

図５は、本実施の形態の底蓋を外管に取り付けた状態の断面を説明する模式図であり、従来の底蓋を取り付けた状態の断面を説明する模式図を図６に示す。   FIG. 5 is a schematic diagram for explaining a section in a state in which the bottom cover of the present embodiment is attached to the outer tube, and FIG. 6 is a schematic diagram for explaining a section in a state in which a conventional bottom cover is attached.

図６は、胴部２３の円弧状の側面に耐熱シール材３５を施工して取り付けた状態を示している。これに対し、本実施の形態では、図５に示すように、胴部２９の側面全周に耐熱シール材３５を施工したことにより、胴部２９の側面と筒状部１７の内周面との間には、全周に渡って耐熱シール材３５が設けられている。すなわち、筒状部１７の開口端と基部２７との間のシール構造に加えて、胴部２９の側面と筒状部１７の内周面との間のシール構造が設けられたことにより、シール幅を全周に渡って増やすことができ、底蓋７と筒状部１７との間の気密性及び密封性を一層向上させることができる。   FIG. 6 shows a state in which the heat-resistant sealing material 35 is constructed and attached to the arc-shaped side surface of the body portion 23. On the other hand, in the present embodiment, as shown in FIG. 5, the heat-resistant sealing material 35 is applied to the entire circumference of the side surface of the body portion 29, so that the side surface of the body portion 29 and the inner peripheral surface of the tubular portion 17 Between them, a heat-resistant sealing material 35 is provided over the entire circumference. In other words, in addition to the seal structure between the open end of the cylindrical portion 17 and the base portion 27, a seal structure between the side surface of the barrel portion 29 and the inner peripheral surface of the cylindrical portion 17 is provided, thereby providing a seal. The width can be increased over the entire circumference, and the airtightness and sealing performance between the bottom lid 7 and the cylindrical portion 17 can be further improved.

次に、このようにして底蓋７が筒状部１７に取り付けられた状態の高温空気加熱器の動作について説明する。   Next, the operation of the high-temperature air heater with the bottom lid 7 attached to the cylindrical portion 17 in this way will be described.

内管３内の風路１３に供給された被加熱空気ａ１は、通孔１１を介して風路１５に流出し、外管５を介して燃焼排ガスＧの熱と熱交換することにより加熱された被加熱空気ａ２となり、風路１５内を上昇して図示しない排出管から所定の熱分解炉などへ送られる。 The heated air a 1 supplied to the air passage 13 in the inner pipe 3 flows out into the air passage 15 through the through hole 11 and is heated by exchanging heat with the heat of the combustion exhaust gas G through the outer pipe 5. It becomes the heated air a 2 that has been heated, rises in the air passage 15 and is sent from a discharge pipe (not shown) to a predetermined pyrolysis furnace or the like.

一方、被加熱空気ａ１の一部は、図示しない受け金物９に形成される通孔を介して空間１９内に導入され、この空間１９内を昇圧させる。このように空間１９内を昇圧させることにより空間１９内に燃焼排ガスＧが侵入することを防ぐことができる。 On the other hand, a part of the heated air a 1 is introduced into the space 19 through a through hole formed in the metal fitting 9 (not shown), and the pressure in the space 19 is increased. By increasing the pressure in the space 19 in this way, it is possible to prevent the combustion exhaust gas G from entering the space 19.

以上述べたように、本発明にかかる高温空気加熱器１は、底蓋７に筒状部１７の内周面と嵌合する円柱状の胴部２９を形成することにより、筒状部１７の開口端と基部との間の領域に加えて、筒状部１７の内周面と胴部２９の外周面との間にも、全周に渡って耐火性シール材を介在させることができるため、シール幅を十分に確保することができ、外管５と底蓋７による密封性を向上させることができる。これにより、燃焼排ガスＧの侵入に対する抵抗を長期間安定して持続することができるため、内管３や受け金物９などの酸化腐食の速度を抑制し、高温空気加熱器の耐久性を向上させるとともに、メンテナンスや補修を行う頻度を低減することができる。なお、受け金物９は酸化腐食が進行すると例えば外管の筒状部１７を内側から押し割る応力が働くが、本実施の形態によれば、そのような応力の発生を抑えることができるため、外壁の長期健全性を保つことができる。   As described above, the high-temperature air heater 1 according to the present invention forms the cylindrical body portion 29 that fits the inner peripheral surface of the cylindrical portion 17 on the bottom lid 7, thereby In addition to the region between the open end and the base portion, a fireproof sealing material can be interposed between the inner peripheral surface of the cylindrical portion 17 and the outer peripheral surface of the trunk portion 29 over the entire periphery. The seal width can be sufficiently secured, and the sealing performance by the outer tube 5 and the bottom cover 7 can be improved. As a result, the resistance against the invasion of the combustion exhaust gas G can be stably maintained for a long period of time, so that the rate of oxidative corrosion of the inner tube 3 and the metal fitting 9 is suppressed and the durability of the high-temperature air heater is improved In addition, the frequency of maintenance and repair can be reduced. In addition, when the oxidization corrosion progresses, for example, a stress that pushes and breaks the tubular portion 17 of the outer tube from the inner side works. However, according to the present embodiment, generation of such stress can be suppressed. The long-term soundness of the outer wall can be maintained.

図７は、本発明の高温空気加熱器が配置される煙道の一例を示す構成図である。   FIG. 7 is a configuration diagram showing an example of a flue in which the high-temperature air heater of the present invention is arranged.

高温空気加熱器４１は、廃棄物を処理した燃焼排ガスＧが鉛直上向きに流れる煙道４３と、その後流側で燃焼排ガスＧが鉛直下向きに流れる煙道４５とにそれぞれ複数配置され、いずれも天井壁を貫通して吊り下げて設けられている。煙道４３に配置される高温空気加熱器４１ａと煙道４５に配置される高温空気加熱器４１ｂは、上述した構成を備えるものとし、図では、金属製の内管３と、その内管を包囲する外管５以外の構成を省略している。   A plurality of high-temperature air heaters 41 are arranged in a flue 43 in which the flue gas G treated with waste flows vertically upward and a flue 45 in which the flue gas G flows vertically downward on the downstream side, both of which are ceilings It is provided suspended through the wall. The high-temperature air heater 41a arranged in the flue 43 and the high-temperature air heater 41b arranged in the flue 45 are assumed to have the above-described configuration, and in the drawing, the metal inner pipe 3 and the inner pipe are arranged. A configuration other than the surrounding outer tube 5 is omitted.

高温空気加熱器４１ａ，４１ｂの外管５ａ，５ｂは、連結管４７を介して互いに連結されている。この例では、被加熱空気４９は、下流側の内管３ｂより流入し、図の矢印で示すように下流側の外管５ｂ、連結管４７、上流側の外管５ａ、内管３ａを順次流れ、その内管３ａより外部に取り出されるようになっている。このように、本発明にかかる高温空気加熱器４１は、内管から被加熱空気を流入させて外管より抜き出すだけでなく、外管から被加熱空気を流入させて内管より抜き出すようにしても、燃焼排ガスＧの腐食成分の侵入による受け金物などの酸化腐食を抑制することができる。   The outer tubes 5 a and 5 b of the high-temperature air heaters 41 a and 41 b are connected to each other via a connecting tube 47. In this example, the heated air 49 flows in from the downstream inner pipe 3b, and sequentially flows through the downstream outer pipe 5b, the connecting pipe 47, the upstream outer pipe 5a, and the inner pipe 3a as shown by the arrows in the figure. It flows out and is taken out from the inner tube 3a. As described above, the high-temperature air heater 41 according to the present invention not only allows the heated air to flow from the inner tube and pulls it out of the outer tube, but also allows the heated air to flow from the outer tube and pulls it from the inner tube. In addition, it is possible to suppress oxidative corrosion of metal parts and the like due to intrusion of corrosive components of the combustion exhaust gas G.

本発明を適用してなる高温空気加熱器の一実施の形態を示す断面図である。It is sectional drawing which shows one Embodiment of the high temperature air heater to which this invention is applied. 本発明を適用してなる高温空気加熱器の一実施の形態の底蓋の斜視図を（ａ）に示し、従来の形状を（ｂ）に示す。The perspective view of the bottom cover of one Embodiment of the high temperature air heater to which this invention is applied is shown to (a), and the conventional shape is shown to (b). 本発明を適用してなる高温空気加熱器の一実施の形態の底蓋の側面図を（ａ）に示し、従来の形状を（ｂ）に示す。The side view of the bottom cover of one embodiment of the high-temperature air heater to which the present invention is applied is shown in (a), and the conventional shape is shown in (b). 本発明を適用してなる高温空気加熱器の一実施の形態の底蓋の上面図を（ａ）に示し、従来の形状を（ｂ）に示す。The top view of the bottom cover of one Embodiment of the high temperature air heater to which this invention is applied is shown to (a), and the conventional shape is shown to (b). 本発明を適用してなる高温空気加熱器の底蓋を外管に取り付けた状態の断面を説明する模式図である。It is a schematic diagram explaining the cross section of the state which attached the bottom cover of the high temperature air heater to which this invention is applied to the outer tube | pipe. 従来の高温空気加熱器の底蓋を外管に取り付けた状態の断面を説明する模式図である。It is a schematic diagram explaining the cross section of the state which attached the bottom cover of the conventional high temperature air heater to the outer tube | pipe. 本発明を適用してなる高温空気加熱器が配置される煙道の一実施の形態を示す構成図である。It is a block diagram which shows one Embodiment of the flue where the high temperature air heater formed by applying this invention is arrange | positioned.

符号の説明Explanation of symbols

１ 高温空気加熱器
３ 内管
５ 外管
７ 底蓋
９ 受け金物
１１ 通孔
１７ 筒状部
２７ 基部
２９ 胴部
３１ 係止部
３３ 係止突起
３５ 耐熱シール材 DESCRIPTION OF SYMBOLS 1 High temperature air heater 3 Inner pipe 5 Outer pipe 7 Bottom cover 9 Receiving object 11 Through-hole 17 Cylindrical part 27 Base part 29 Body part 31 Locking part 33 Locking protrusion 35 Heat-resistant sealing material

Claims (1)

燃焼排ガスの流路内に吊り下げられて設置される高温空気加熱器の外壁を形成する耐火性外管の開口端に蓋体を嵌合させて前記耐火性外管を封止する高温空気加熱器の蓋取付構造において、
前記蓋体は、前記開口端が当接する基部の当接面から突出して前記耐火性外管の内周面と嵌合する円柱状の胴部と、該胴部の端面に形成されて前記胴部の外周面よりも外側に突出する一対の係止突起とを備え、
前記耐火性外管には、前記係止突起が差し込まれる係止溝が前記開口端から内周面の軸方向と軸線周りに形成されてなり、
前記蓋体を前記耐火性外管に差し込んで軸線周りに回転させた状態で、前記耐火性外管の前記開口端と前記基部の当接面との間、及び、前記耐火性外管の内周面と前記胴部の外周面との間に、耐火性シール材を介在させてなることを特徴とする高温空気加熱器の蓋取付構造。 High-temperature air heating that seals the refractory outer tube by fitting a lid to the open end of the refractory outer tube that forms the outer wall of a high-temperature air heater that is suspended and installed in the flow path of the combustion exhaust gas In the lid mounting structure of the vessel,
The lid body is formed on a cylindrical body portion that protrudes from an abutting surface of a base portion with which the opening end abuts and is fitted to an inner peripheral surface of the refractory outer tube, and is formed on an end surface of the body portion. A pair of locking projections protruding outward from the outer peripheral surface of the part,
In the fireproof outer tube, a locking groove into which the locking projection is inserted is formed from the opening end to the axial direction and the axis line of the inner peripheral surface,
In a state where the lid is inserted into the fireproof outer tube and rotated around the axis, between the opening end of the fireproof outer tube and the contact surface of the base, and inside the fireproof outer tube A lid mounting structure for a high-temperature air heater, wherein a fireproof sealing material is interposed between a peripheral surface and an outer peripheral surface of the body portion.
JP2007087057A 2007-03-29 2007-03-29 High temperature air heater lid mounting structure Expired - Fee Related JP4820772B2 (en)

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