JP6069379B2 - Regenerative combustion equipment - Google Patents
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- JP6069379B2 JP6069379B2 JP2015019782A JP2015019782A JP6069379B2 JP 6069379 B2 JP6069379 B2 JP 6069379B2 JP 2015019782 A JP2015019782 A JP 2015019782A JP 2015019782 A JP2015019782 A JP 2015019782A JP 6069379 B2 JP6069379 B2 JP 6069379B2
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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
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- 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、自己排ガス再循環（ＦＧＲ）方式のリジェネレイティブ燃焼装置に関するものである。 The present invention relates to a self-exhaust exhaust gas recirculation (FGR) type regenerative combustion apparatus.
リジェネレイティブ燃焼装置は、一般に、蓄熱体と一体化した一対のバーナーを数十秒間隔で交互に燃焼させ、一方のバーナーが燃焼している時には、その排気が他方のバーナーの蓄熱体を加熱することで排気の熱エネルギーを回収し、次にそのバーナーが燃焼するときには、加熱した蓄熱体を通過させて燃焼用空気を予熱することで高効率の燃焼を得るものであり、従来捨てていた排気の熱を回収して燃焼効率を高めることで燃焼装置の省エネ化を図っている。 A regenerative combustion apparatus generally burns a pair of burners integrated with a heat storage body alternately at intervals of several tens of seconds, and when one burner is burning, the exhaust heats the heat storage body of the other burner. The heat energy of the exhaust is recovered, and when the burner burns next, the heated air is passed through and the combustion air is preheated to obtain high-efficiency combustion. The energy of the combustion device is saved by recovering the heat of the exhaust to increase the combustion efficiency.
このようなリジェネレイティブ燃焼装置における排ガス再循環方式は、燃焼によって生成した排ガスの一部を排ガス経路から再循環経路を経て燃料噴射室内に還流させて混合することにより、燃焼によって生成されるＮＯｘの低減化を図るものである。この際、燃料の噴射圧による吸引（エジェクタ効果）によって排ガスを還流させる方式を自己排ガス再循環（ＦＧＲ）方式と呼んでいる。自己排ガス再循環方式のリジェネレイティブ燃焼装置は、一対のバーナーがそれぞれ備える燃料噴射室を繋ぐ連絡管（ＦＧＲ管）を備えており、各燃料噴射室には、燃料噴射ノズルと排気煙道を兼ねる混合筒が対向して接続されている（下記特許文献１参照）。 In such a regenerative combustion apparatus, the exhaust gas recirculation system is configured to recirculate a part of the exhaust gas generated by combustion from the exhaust gas path to the fuel injection chamber through the recirculation path, thereby mixing NOx generated by combustion. This is intended to reduce this. At this time, a method of recirculating exhaust gas by suction (ejector effect) by fuel injection pressure is called a self exhaust gas recirculation (FGR) method. The self-exhaust exhaust gas recirculation type regenerative combustion apparatus includes a communication pipe (FGR pipe) that connects fuel injection chambers provided in a pair of burners, and each fuel injection chamber includes a fuel injection nozzle and an exhaust flue. The mixing cylinders that double as each other are connected to face each other (see Patent Document 1 below).
自己排ガス再循環方式のリジェネレイティブ燃焼装置は、通過する排ガスの熱で前述した連絡管が加熱されて熱歪みが生じる。連絡管を流れる排ガスの方向は、一対のバーナーの燃焼の切り換えによって反転することになるので、連絡管の熱応力分布がバーナーの燃焼切り換えによって変化して、特定の箇所に繰り返し応力が生じることになる。このため連絡管は熱疲労を起こしやすい問題がある。 In the self-exhaust gas recirculation type regenerative combustion apparatus, the connecting pipe described above is heated by the heat of the exhaust gas passing therethrough, resulting in thermal distortion. The direction of the exhaust gas flowing through the connecting pipe is reversed by switching the combustion of the pair of burners, so that the thermal stress distribution of the connecting pipe is changed by the combustion switching of the burner, and stress is repeatedly generated at a specific location. Become. For this reason, there is a problem that the connecting pipe is liable to cause thermal fatigue.
従来、前述した連絡管には、熱歪みを考慮して耐熱性の高いステンレス材料が用いられている。また、前述した繰り返し応力を吸収するため或いは既設のバーナーへの取付けを容易にするために、連絡管の中間部に波付き伸縮管を設けることがなされている。しかしながら、再循環する排ガスの温度は６００〜７００℃になる場合があり、ステンレス材料の鋭敏化や炭化減肉によって波付き伸縮管の部分が短期間に損傷を受けやすくなっている。 Conventionally, a stainless material having high heat resistance is used for the connecting pipe described above in consideration of thermal distortion. Further, in order to absorb the above-described repeated stress or to facilitate attachment to an existing burner, a corrugated expansion / contraction tube is provided in the middle portion of the connecting tube. However, the temperature of the recirculated exhaust gas may be 600 to 700 ° C., and the corrugated elastic tube portion is easily damaged in a short time due to the sensitization of the stainless material and the carbonization thinning.
本発明は、このような問題に対処することを課題の一例とするものである。すなわち、自己排ガス再循環（ＦＧＲ）方式のリジェネレイティブ燃焼装置において、熱疲労に対して耐久性のある連絡管を設けること、波付き伸縮管を設けた連絡管に対して、ステンレス材料の鋭敏化や炭化減肉による短時間の損傷を防ぐこと、等が本発明の目的である。 This invention makes it an example of a subject to cope with such a problem. That is, in the self-exhaust exhaust gas recirculation (FGR) type regenerative combustion apparatus, a connecting pipe that is durable against thermal fatigue is provided, and a stainless steel material is sensitive to a connecting pipe provided with a corrugated expansion and contraction pipe. It is an object of the present invention to prevent short-time damage due to carbonization or carbonization thinning.
このような目的を達成するために、本発明によるリジェネレイティブ燃焼装置は、以下の構成を具備するものである。
一対のリジェネレイティブバーナーと各リジェネレイティブバーナーにおける燃料噴射室間を連通させる連絡管とを備えた自己排ガス再循環方式のリジェネレイティブ燃焼装置であって、前記連絡管は、複数の分割管が波付き伸縮管を介して接続されており、前記波付き伸縮管の内側に断熱材を配置したことを特徴とするリジェネレイティブ燃焼装置。
In order to achieve such an object, a regenerative combustion apparatus according to the present invention has the following configuration.
A regenerative combustion apparatus of a self-exhaust gas recirculation system comprising a pair of regenerative burners and a communication pipe communicating between the fuel injection chambers in each regenerative burner, wherein the communication pipe comprises a plurality of divided pipes Are connected via a corrugated telescopic tube, and a heat generating material is disposed inside the corrugated telescopic tube.
このような特徴を有するリジェネレイティブ燃焼装置は、連絡管を複数の分割管で構成してその間に波付き伸縮管を介在させているので、熱歪みによる繰り返し応力を波付き伸縮管の伸縮によって吸収することができる。また、波付き伸縮管の内側に断熱材を配置しているので、排ガスの熱で波付き伸縮管が高温に加熱されるのを防止することができる。これによって、熱疲労に対して耐久性のある連絡管を設けることができ、波付き伸縮管を設けた連絡管に対して、ステンレス材料の鋭敏化や炭化減肉による短時間の損傷を防ぐことができる。 In the regenerative combustion apparatus having such a feature, the connecting pipe is constituted by a plurality of divided pipes, and the corrugated expansion / contraction pipe is interposed therebetween, so that repeated stress due to thermal strain is caused by expansion / contraction of the corrugated expansion / contraction pipe. Can be absorbed. Moreover, since the heat insulating material is arrange | positioned inside the corrugated expansion-contraction tube, it can prevent that a corrugated expansion-contraction tube is heated by high temperature with the heat | fever of waste gas. This makes it possible to provide a connection tube that is durable against thermal fatigue, and prevents damage to the connection tube provided with corrugated expansion and contraction due to the sensitization of stainless steel and carbonization thinning. Can do.
以下、図面を参照して本発明の実施形態を説明する。図１は本発明の一実施形態の要部を示している。一対のリジェネレイティブバーナーの燃料噴射室１間を連通する連絡管（ＦＧＲ管）２は、複数の分割管２Ａ１，２Ａ２が波付き伸縮管２Ｂを介して接続されている。そして、波付き伸縮管２Ｂの内側に断熱材２０が配置されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a main part of one embodiment of the present invention. The connecting pipe (FGR pipe) 2 that communicates between the fuel injection chambers 1 of the pair of regenerative burners has a plurality of divided pipes 2A1 and 2A2 connected via a corrugated expansion / contraction pipe 2B. And the heat insulating material 20 is arrange | positioned inside the corrugated expansion-contraction pipe | tube 2B.
図１に示した例では、分割管２Ａ１，２Ａ２は、その一端側がリジェネレイティブバーナーの燃料噴射室１に接続され、その他端側が間隔を空けて突き合わせられた同径管によって構成されている。そして、波付き伸縮管２Ｂは、分割管２Ａ１，２Ａ２の外径より大きい内径を有し、分割管２Ａ２（又は２Ａ１）の外側に重ねて配置されており、波付き伸縮管２Ｂと重なる分割管２Ａ２の外側に断熱材２０が配置されている。 In the example shown in FIG. 1, the split pipes 2A1 and 2A2 are configured by the same diameter pipes whose one end is connected to the fuel injection chamber 1 of the regenerative burner and whose other end is abutted with a gap. The corrugated expansion / contraction tube 2B has an inner diameter larger than the outer diameter of the division tubes 2A1 and 2A2, and is disposed so as to overlap the division tube 2A2 (or 2A1), and overlaps with the corrugation expansion / contraction tube 2B. The heat insulating material 20 is arrange | positioned on the outer side of 2A2.
また、波付き伸縮管２Ｂの両端は、分割管２Ａ１，２Ａ２の外周に設けたフランジ部２１に接続されており、一対のフランジ部２１の間に断熱材２０が配置されている。 Further, both ends of the corrugated expansion / contraction tube 2B are connected to a flange portion 21 provided on the outer periphery of the split tubes 2A1 and 2A2, and a heat insulating material 20 is disposed between the pair of flange portions 21.
このような連絡管２によると、分割管２Ａ１，２Ａ２の熱伸縮を波付き伸縮管２Ｂが吸収することで、熱歪みに対する耐久性を向上させており、断熱材２０を波付き伸縮管２Ｂの内側に配置することで、波付き伸縮管２Ｂが吸引されて還流する排ガスによって高温に加熱されるのを防いでいる。これによって、波付き伸縮管２Ｂの温度を２００℃程度以下に抑えることができ、ステンレス材料を用いる場合にも高温加熱によって起きる鋭敏化や炭化減肉を回避することができる。 According to such a connecting tube 2, the corrugated expansion tube 2B absorbs the thermal expansion and contraction of the split tubes 2A1 and 2A2, thereby improving the durability against thermal distortion, and the heat insulating material 20 is connected to the corrugated expansion tube 2B. By disposing it inside, the corrugated telescopic tube 2B is prevented from being heated to a high temperature by the exhaust gas sucked and refluxed. Thereby, the temperature of the corrugated expansion tube 2B can be suppressed to about 200 ° C. or less, and sensitization and carbonization thinning caused by high-temperature heating can be avoided even when a stainless steel material is used.
ここで、断熱材２０は、分割管２Ａ２（又は２Ａ１）の外側に配置することで、連絡管２を流れる排ガス流の圧力損失が増大するのを防いでいる。そのための構造として、分割管２Ａ１，２Ａ２の外周にフランジ部２１を設けて分割管２Ａ１，２Ａ２の外径より大きい内径を有する波付き伸縮管２Ｂの両端をフランジ部２１に接続し、そのフランジ部２１間に断熱材２０を配置している。 Here, the heat insulating material 20 prevents the pressure loss of the exhaust gas flow flowing through the connecting pipe 2 from increasing by being arranged outside the dividing pipe 2A2 (or 2A1). As a structure for this purpose, a flange portion 21 is provided on the outer periphery of the split pipes 2A1 and 2A2, and both ends of the corrugated expansion and contraction pipe 2B having an inner diameter larger than the outer diameter of the split pipes 2A1 and 2A2 are connected to the flange portion 21. A heat insulating material 20 is disposed between 21.
また、分割管２Ａ１，２Ａ２の外径より大きい内径を有する波付き伸縮管２Ｂは、分割管２Ａ１，２Ａ２の軸ズレを吸収することができる。これによって既設のリジェネレイティブバーナーに対して連絡管２を後付けする場合に、簡易に付設することが可能になる。 The corrugated telescopic tube 2B having an inner diameter larger than the outer diameter of the divided tubes 2A1 and 2A2 can absorb the axial displacement of the divided tubes 2A1 and 2A2. This makes it possible to easily attach the connecting pipe 2 to an existing regenerative burner.
図２は、一対のリジェネレイティブバーナーの燃料噴射室１間を連通する連絡管（ＦＧＲ管）２の他の構成例を示している。この例も前述した例と同様に複数の分割管２Ａ１，２Ａ２，２Ａ３を備えており、複数の分割管２Ａ１，２Ａ２，２Ａ３が、一対のリジェネレイティブバーナーにおける一方側の燃料噴射室１に一端側が接続される第１の分割管２Ａ１と、一対のリジェネレイティブバーナーの他方側の燃料噴射室１に一端側が接続される第２の分割管２Ａ２と、第１の分割管２Ａ１の他端側と第２の分割管２Ａ２の他端側の間に配置される第３の分割管２Ａ３によって構成される。ここで、第３の分割管２Ａ３の両端は、それぞれ間隔を空けて第１の分割管２Ａ１又は第２の分割管２Ａ２の他端側と突き合わせられている。 FIG. 2 shows another configuration example of the connecting pipe (FGR pipe) 2 that communicates between the fuel injection chambers 1 of the pair of regenerative burners. This example also includes a plurality of dividing pipes 2A1, 2A2, and 2A3 as in the above-described example, and the plurality of dividing pipes 2A1, 2A2, and 2A3 are connected to the fuel injection chamber 1 on one side of the pair of regenerative burners. A first split pipe 2A1 to which the side is connected, a second split pipe 2A2 whose one end is connected to the fuel injection chamber 1 on the other side of the pair of regenerative burners, and the other end of the first split pipe 2A1 And the third split tube 2A3 disposed between the other end sides of the second split tube 2A2. Here, both ends of the third divided tube 2A3 are abutted against the other end side of the first divided tube 2A1 or the second divided tube 2A2 with a space between each other.
そして、第１の分割管２Ａ１の他端側と第３の分割管２Ａ３の一端側が波付き伸縮管２Ｂ１を介して接続され、第２の分割管２Ａ２の他端側と第３の分割管２Ａ３の他端側が波付き伸縮管２Ｂ２を介して接続されており、波付き伸縮管２Ｂ１，２Ｂ２の内側には、それぞれ断熱材２０が配置されている。 The other end side of the first split tube 2A1 and one end side of the third split tube 2A3 are connected via a corrugated telescopic tube 2B1, and the other end side of the second split tube 2A2 and the third split tube 2A3. Are connected to each other via a corrugated expansion / contraction tube 2B2, and a heat insulating material 20 is disposed inside each of the corrugated expansion / contraction tubes 2B1 and 2B2.
ここで、波付き伸縮管２Ｂ１，２Ｂ２と分割管２Ａ１，２Ａ２，２Ａ３との接続構造は前述した例と同様であり、分割管２Ａ１，２Ａ３の外周にフランジ部２１を設けて分割管２Ａ１，２Ａ３の外径より大きい内径を有する波付き伸縮管２Ｂ１の両端をフランジ部２１に接続し、そのフランジ部２１間に断熱材２０を配置しており、分割管２Ａ３，２Ａ２の外周にフランジ部２１を設けて分割管２Ａ３，２Ａ２の外径より大きい内径を有する波付き伸縮管２Ｂ２の両端をフランジ部２１に接続し、そのフランジ部２１間に断熱材２０を配置している。 Here, the connection structure between the corrugated telescopic pipes 2B1 and 2B2 and the divided pipes 2A1, 2A2 and 2A3 is the same as the above-described example, and a flange portion 21 is provided on the outer periphery of the divided pipes 2A1 and 2A3 to provide the divided pipes 2A1 and 2A3. Both ends of the corrugated expansion tube 2B1 having an inner diameter larger than the outer diameter of the tube are connected to the flange portion 21, the heat insulating material 20 is disposed between the flange portions 21, and the flange portion 21 is disposed on the outer periphery of the divided tubes 2A3 and 2A2. Provided are both ends of a corrugated telescopic tube 2B2 having an inner diameter larger than the outer diameter of the divided tubes 2A3, 2A2 connected to the flange portion 21, and a heat insulating material 20 is disposed between the flange portions 21.
また、第１の分割管２Ａ１（或いは第２の分割管２Ａ２）の一端側と第３の分割管２Ａ３の中間外周部とが連結ロッド２２を介して連結されている。第１の分割管２Ａ１（或いは第２の分割管２Ａ２）の一端側と第３の分割管２Ａ３の中間外周部にはそれぞれ外側に向けてアーム２３を張り出させており、このアーム２３間に連結ロッド２２が連結されている。 In addition, one end side of the first dividing pipe 2A1 (or the second dividing pipe 2A2) and the intermediate outer peripheral portion of the third dividing pipe 2A3 are connected via a connecting rod 22. Arms 23 are projected outward from one end side of the first split pipe 2A1 (or the second split pipe 2A2) and the intermediate outer peripheral portion of the third split pipe 2A3. The connecting rod 22 is connected.
このような構成例を備える連絡管２を採用する場合にも、前述した例と同様に、熱歪みに対する耐久性を向上させることができ、波付き伸縮管２Ｂ１，２Ｂ２にステンレス材料を用いる場合に高温加熱によって起きる鋭敏化や炭化減肉を回避することができる。また、連絡管２を流れる排ガス流の圧力損失が増大するのを防ぐことができる。更には、波付き伸縮管２Ｂ１，２Ｂ２を２個設けることで、熱伸縮と分割管２Ａ１，２Ａ２，２Ａ３の偏芯による合成変位に対して高い耐久性を得ることができる。 Even when the connecting pipe 2 having such a configuration example is adopted, the durability against thermal strain can be improved similarly to the above-described example, and when the stainless steel material is used for the corrugated expansion and contraction pipes 2B1 and 2B2. Sensitization and char loss caused by high temperature heating can be avoided. Further, it is possible to prevent an increase in pressure loss of the exhaust gas flow flowing through the communication pipe 2. Furthermore, by providing two corrugated expansion and contraction tubes 2B1 and 2B2, it is possible to obtain high durability against the combined displacement due to thermal expansion and contraction of the split tubes 2A1, 2A2 and 2A3.
また、この構成例は、第１の分割管２Ａ１（又は第２の分割管２Ａ２）と第３の分割管２Ａ３とを連結ロッド２２で連結しているので、この連結ロッド２２の長さを適宜調整することで、２つの波付き伸縮管２Ｂ１，２Ｂ２の変位量を均等に分散させることができ、また、既設のリジェネレイティブバーナーへの付設時に、第３の分割管２Ａ３を吊り下げることで据付作業を簡易に行うことができる。 In this configuration example, the first dividing pipe 2A1 (or the second dividing pipe 2A2) and the third dividing pipe 2A3 are connected by the connecting rod 22, so that the length of the connecting rod 22 is appropriately set. By adjusting, the amount of displacement of the two waved telescopic tubes 2B1, 2B2 can be evenly distributed, and when attached to the existing regenerative burner, the third split tube 2A3 is suspended. Installation work can be performed easily.
図３は、前述した連絡管の構成を採用することができるリジェネレイティブ燃焼装置の構成例を示している。リジェネレイティブ燃焼装置１００は、ラジアントチューブ９の両端に一対のリジェネレイティブバーナー１０ａ，１０ｂを設置している。リジェネレイティブバーナー１０ａ，１０ｂは、同一構造を有しており、前述した連絡管２によって連通される燃料噴射室１を備え、燃料噴射室１には、燃料噴射ノズル４と混合筒５と排気煙道３を兼ねる筒状体が対向して接続されている。 FIG. 3 shows a configuration example of a regenerative combustion apparatus that can employ the configuration of the connecting pipe described above. In the regenerative combustion apparatus 100, a pair of regenerative burners 10 a and 10 b are installed at both ends of the radiant tube 9. The regenerative burners 10a and 10b have the same structure and are provided with a fuel injection chamber 1 communicated by the connecting pipe 2 described above. The fuel injection chamber 1 has a fuel injection nozzle 4, a mixing cylinder 5, and an exhaust. The cylindrical bodies that also serve as the flue 3 are connected to face each other.
また、リジェネレイティブバーナー１０ａ，１０ｂは、燃料噴射室１を囲むように給気部（排気部）７を有する空気筒６が設けられており、混合筒５（排気煙道３）と空気筒６の間に筒状蓄熱体１１が設置されている。この筒状蓄熱体１１は、内筒１２と外筒１３間にアルミナ製ボール等の多数の蓄熱体１４を充填することで構成されている。空気筒６は、バーナータイル１５を介してラジアントチューブ９に接続されており、ラジアントチューブ９に連通する混合筒５の先端部には、パイロットバーナー８が設置されている。 The regenerative burners 10a and 10b are provided with an air cylinder 6 having an air supply part (exhaust part) 7 so as to surround the fuel injection chamber 1, and a mixing cylinder 5 (exhaust flue 3) and an air cylinder. A cylindrical heat accumulator 11 is installed between 6. The cylindrical heat storage body 11 is configured by filling a large number of heat storage bodies 14 such as alumina balls between the inner cylinder 12 and the outer cylinder 13. The empty cylinder 6 is connected to the radiant tube 9 via the burner tile 15, and a pilot burner 8 is installed at the tip of the mixing cylinder 5 communicating with the radiant tube 9.
このようなリジェネレイティブ燃焼装置１００は、一方のリジェネレイティブバーナー１０ａが燃焼時には、給気部７から空気筒６内に供給された空気が、筒状蓄熱体１１の外筒１３の外周から求心状に蓄熱体１４の充填部に流入し、この充填部を流れた後、内筒１２内に流出して、この内筒１２の一端側からバーナータイル１５を経てラジアントチューブ９内に噴出し、混合筒５から噴出する燃料と燃焼排ガスとの混合気と混合して燃焼に供される。 In such a regenerative combustion apparatus 100, when one regenerative burner 10 a is combusted, air supplied from the air supply unit 7 into the air cylinder 6 is supplied from the outer periphery of the outer cylinder 13 of the cylindrical heat accumulator 11. It flows into the filling portion of the heat accumulator 14 in a centripetal manner, flows through the filling portion, then flows out into the inner cylinder 12, and is ejected from one end side of the inner cylinder 12 into the radiant tube 9 through the burner tile 15. Then, the fuel is ejected from the mixing cylinder 5 and mixed with an air-fuel mixture of combustion exhaust gas, and is used for combustion.
一方、他方のリジェネレイティブバーナー１０ｂでは燃焼が停止状態で、当然燃料も噴射されておらず、排気状態となっている。即ち、一方のリジェネレイティブバーナー１０ａの燃焼排ガスは、バーナータイル１５から内筒１２内に流入した後、放射状に充填部に流入し、充填部を流れて外筒１３の外周から空気筒６内に流出し、排気部７から流出して排気される。 On the other hand, in the other regenerative burner 10b, combustion is in a stopped state, naturally fuel is not injected, and the exhausted state. That is, the combustion exhaust gas of one regenerative burner 10a flows into the inner cylinder 12 from the burner tile 15 and then radially flows into the filling section, flows through the filling section, and flows into the air cylinder 6 from the outer periphery of the outer cylinder 13. And then flows out from the exhaust section 7 and is exhausted.
燃焼状態が切り換えられる次の時点では、他方のリジェネレイティブバーナー１０ｂが燃焼状態、一方のリジェネレイティブバーナー１０ａが燃焼停止状態となり、前述の説明と逆の経路で燃焼用空気が供給され、そして燃焼排ガスが排気される。このように給気部（排気部）７は燃焼状態が切り換えられる次の時点では、排気部（給気部）７として動作する。 At the next time when the combustion state is switched, the other regenerative burner 10b is in the combustion state, one regenerative burner 10a is in the combustion stopped state, and combustion air is supplied in the reverse path to the above description, and Combustion exhaust gas is exhausted. Thus, the air supply unit (exhaust unit) 7 operates as the exhaust unit (air supply unit) 7 at the next time point when the combustion state is switched.
以上の動作において、それぞれのリジェネレイティブバーナー１０ａ，１０ｂの燃料噴射室１間は連絡管２により連結されているため、燃焼状態のリジェネレイティブバーナー１０ａ（又は１０ｂ）における燃料の噴射により生ずる負圧により、排気状態のリジェネレイティブバーナー１０ｂ（又は１０ａ）においては、ラジアントチューブ９から、排気煙道３を兼ねる混合筒５を介して燃料噴射室１に燃焼排ガスの一部が吸引され、連絡管２を経て流れて、燃焼状態のリジェネレイティブバーナー１０ａ（又は１０ｂ）の燃料噴射室１内に流入し、上述したように燃料と混合されて排ガス再循環燃焼が行われる。 In the above operation, since the fuel injection chambers 1 of the respective regenerative burners 10a and 10b are connected by the communication pipe 2, the negative generated by the fuel injection in the regenerative burner 10a (or 10b) in the combustion state. Due to the pressure, in the regenerative burner 10b (or 10a) in the exhaust state, a part of the combustion exhaust gas is sucked from the radiant tube 9 into the fuel injection chamber 1 through the mixing cylinder 5 also serving as the exhaust flue 3 and communicated. It flows through the pipe 2 and flows into the fuel injection chamber 1 of the regenerative burner 10a (or 10b) in the combustion state, and is mixed with fuel as described above to perform exhaust gas recirculation combustion.
図３に示す実施の形態では、燃料噴射室１内における燃焼排ガスの再循環経路に網筒状蓄熱体等のＦＧＲ蓄熱体１６が設置されている。このため、一方側のリジェネレイティブバーナー１０ａ（又は１０ｂ）の燃料噴射室１内に至った燃焼排ガスは、このＦＧＲ蓄熱体１６を通って熱を放出した状態で連絡管２を流れ、他方側のリジェネレイティブバーナー１０ｂ（又は１０ａ）の燃料噴射室１内に流入する際に、ＦＧＲ蓄熱体１６の熱を奪って熱を回収する。従って、連絡管２を流れる燃焼排ガスの温度が低下するので、そこからの放熱が少なく、作業環境が向上すると共に、熱回収が行われるため効率も向上する。 In the embodiment shown in FIG. 3, an FGR heat storage body 16 such as a net tubular heat storage body is installed in the recirculation path of the combustion exhaust gas in the fuel injection chamber 1. For this reason, the combustion exhaust gas that has reached the fuel injection chamber 1 of the regenerative burner 10a (or 10b) on one side flows through the connecting pipe 2 in a state of releasing heat through the FGR heat accumulator 16, and the other side. When the regenerative burner 10b (or 10a) flows into the fuel injection chamber 1, the heat of the FGR heat accumulator 16 is taken away and the heat is recovered. Accordingly, the temperature of the combustion exhaust gas flowing through the connecting pipe 2 is lowered, so that heat is less radiated therefrom, the working environment is improved, and heat recovery is performed, so that the efficiency is also improved.
図４は、前述した連絡管２の構成を採用することができる他のリジェネレイティブ燃焼装置の構成例を示している。この図においては、図３の構成要素と同様な構成要素には同一の符号を付して重複する説明は省略する。図４のリジェネレイティブ燃焼装置１００Ａでは、炉１７の適所に対を成すリジェネレイティブバーナー１０ａ，１０ｂを設置している。対を成すリジェネレイティブバーナー１０ａ，１０ｂの配置は、図に示すような配置の他、対向した配置等、適宜である。リジェネレイティブバーナー１０ａ，１０ｂの構成及び動作は図３のものと同様であるので、説明は省略する。 FIG. 4 shows a configuration example of another regenerative combustion apparatus that can employ the configuration of the connecting pipe 2 described above. In this figure, the same components as those in FIG. 3 are denoted by the same reference numerals, and redundant description is omitted. In the regenerative combustion apparatus 100A of FIG. 4, regenerative burners 10a and 10b that are paired at appropriate positions of the furnace 17 are installed. Arrangement of the regenerative burners 10a and 10b forming a pair is appropriate such as arrangement opposite to each other as shown in the figure. The configuration and operation of the regenerative burners 10a and 10b are the same as those in FIG.
このようなリジェネレイティブ燃焼装置１００，１００Ａにおいて、一対の燃料噴射室１間を連通する連絡管２を図１或いは図２に示す構成にすることで、連絡管２の耐久性を高めることができ、リジェネレイティブ燃焼装置１００，１００Ａのメンテナンス性を向上させることができる。 In such a regenerative combustion apparatus 100, 100A, the connection pipe 2 communicating between the pair of fuel injection chambers 1 is configured as shown in FIG. 1 or FIG. It is possible to improve the maintainability of the regenerative combustion apparatus 100, 100A.
１００，１００Ａ：リジェネレイティブ燃焼装置，
１：燃料噴射室，２：連絡管（ＦＧＲ管），
２Ａ１，２Ａ２，２Ａ３：分割管，
２Ｂ，２Ｂ１，２Ｂ２：波付き伸縮管，２０：断熱材，２１：フランジ部，
２２：連結ロッド，２３：アーム，
３：排気煙道，４：燃料噴射ノズル，５：混合筒，６：空気筒，
７：給気部（排気部），８：パイロットバーナー，９：ラジアントチューブ，
１０ａ，１０ｂ：リジェネレイティブバーナー，
１１：筒状蓄熱体，１２：内筒，１３：外筒，１４：蓄熱体，
１５：バーナータイル，１６：ＦＧＲ蓄熱体，１７：炉
100, 100A: Regenerative combustion apparatus,
1: Fuel injection chamber, 2: Communication pipe (FGR pipe),
2A1, 2A2, 2A3: Dividing pipe,
2B, 2B1, 2B2: Corrugated telescopic tube, 20: Insulating material, 21: Flange part,
22: Connecting rod, 23: Arm,
3: exhaust flue, 4: fuel injection nozzle, 5: mixing cylinder, 6: air cylinder,
7: Air supply part (exhaust part), 8: Pilot burner, 9: Radiant tube,
10a, 10b: Regenerative burner,
11: cylindrical heat storage body, 12: inner cylinder, 13: outer cylinder, 14: heat storage body,
15: Burner tile, 16: FGR regenerator, 17: Furnace
Claims (5)
前記連絡管は、複数の分割管が波付き伸縮管を介して接続されており、前記波付き伸縮管の内側に断熱材を配置したことを特徴とするリジェネレイティブ燃焼装置。 A regenerative combustion apparatus of a self-exhaust gas recirculation system comprising a pair of regenerative burners and a communication pipe communicating between fuel injection chambers in each regenerative burner,
The regenerative combustion apparatus is characterized in that a plurality of divided tubes are connected to each other through a corrugated expansion / contraction tube, and a heat insulating material is disposed inside the corrugated expansion / contraction tube.
前記第１の分割管の他端側と前記第３の分割管の一端側が前記波付き伸縮管を介して接続され、前記第２の分割管の他端側と前記第３の分割管の他端側が前記波付き伸縮管を介して接続されていることを特徴とする請求項１〜３のいずれか１項に記載のリジェネレイティブ燃焼装置。 The plurality of split pipes have one end connected to one fuel injection chamber of a pair of regenerative burners and one end connected to the other fuel injection chamber of the pair of regenerative burners. A second split pipe, and a third split pipe disposed between the other end side of the first split pipe and the other end side of the second split pipe,
The other end side of the first divided tube and one end side of the third divided tube are connected via the corrugated telescopic tube, and the other end side of the second divided tube and the other of the third divided tube The regenerative combustion apparatus according to any one of claims 1 to 3, wherein an end side is connected via the corrugated expansion and contraction tube.
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