JP2003279001A - Single-end type radiant tube combustion device - Google Patents
Single-end type radiant tube combustion deviceInfo
- Publication number
- JP2003279001A JP2003279001A JP2002083094A JP2002083094A JP2003279001A JP 2003279001 A JP2003279001 A JP 2003279001A JP 2002083094 A JP2002083094 A JP 2002083094A JP 2002083094 A JP2002083094 A JP 2002083094A JP 2003279001 A JP2003279001 A JP 2003279001A
- Authority
- JP
- Japan
- Prior art keywords
- radiant tube
- combustion
- oxygen
- containing gas
- fuel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 77
- 239000007789 gas Substances 0.000 claims abstract description 93
- 239000000446 fuel Substances 0.000 claims abstract description 79
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 65
- 239000001301 oxygen Substances 0.000 claims abstract description 65
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 65
- 239000000567 combustion gas Substances 0.000 claims abstract description 29
- 230000002093 peripheral effect Effects 0.000 claims description 17
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Landscapes
- Combustion Of Fluid Fuel (AREA)
- Gas Burners (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、シングルエンド型
ラジアントチューブ燃焼装置に関する。TECHNICAL FIELD The present invention relates to a single-ended radiant tube combustion device.
【０００２】[0002]
【従来の技術】かかるシングルエンド型ラジアントチュ
ーブ燃焼装置は、例えば、金属溶解、熱処理等の工業炉
の熱源として用いられるものであり、先端が閉塞された
ラジアントチューブ内でガス燃料を燃焼させて、加熱対
象物を間接的に加熱するものである。従来は、図６に示
すように、ラジアントチューブ１内に、両端が開口した
燃焼筒４０をその先端がラジアントチューブ１の閉塞先
端側を向き且つ閉塞先端との間に間隔が開く状態で設け
ていた。そして、ラジアントチューブ１の基端側から先
端側に向けて、ガス燃料Ｇを燃焼筒４０の中心に供給す
る燃料供給部４１と、その燃料供給部４１から供給され
るガス燃料Ｇの外周側を筒状に流動させる状態で燃焼用
酸素含有ガスＡを燃焼筒４０内に供給する酸素含有ガス
供給部４２と、燃焼筒４０とラジアントチューブ１との
間の環状空間を通してラジアントチューブ１の先端側か
ら基端側に向けて流動する燃焼ガスＥを排気する排気部
４３とを設け、炎Ｆを燃焼筒４０内にてラジアントチュ
ーブ１の先端に向けて延びるように形成し、燃焼ガスＥ
をラジアントチューブ１の先端で反転させて、燃焼筒４
０とラジアントチューブ１との間の環状空間を流動させ
て、排気部４３から排出するように構成していた。2. Description of the Related Art Such a single-ended radiant tube combustion apparatus is used, for example, as a heat source of an industrial furnace for melting metal, heat treatment, etc., by burning gas fuel in a radiant tube whose tip is closed, The object to be heated is indirectly heated. Conventionally, as shown in FIG. 6, a combustion tube 40 having both ends opened is provided in the radiant tube 1 with its tip facing the closed tip side of the radiant tube 1 and with a gap between it and the closed tip. It was A fuel supply unit 41 that supplies the gas fuel G to the center of the combustion tube 40 and an outer peripheral side of the gas fuel G that is supplied from the fuel supply unit 41 are arranged from the base end side to the tip end side of the radiant tube 1. From the tip side of the radiant tube 1 through the oxygen-containing gas supply unit 42 that supplies the combustion-use oxygen-containing gas A into the combustion tube 40 in a tubular state and the annular space between the combustion tube 40 and the radiant tube 1. An exhaust unit 43 for exhausting the combustion gas E flowing toward the base end side is provided, and the flame F is formed so as to extend toward the tip of the radiant tube 1 in the combustion cylinder 40.
At the tip of the radiant tube 1 and the combustion tube 4
0 and the radiant tube 1 were made to flow in the annular space and discharged from the exhaust portion 43.
【０００３】[0003]
【発明が解決しようとする課題】ところで、かかるシン
グルエンド型ラジアントチューブ燃焼装置においては、
加熱はラジアントチューブを介して行われるものであ
る。しかしながら、従来のシングルエンド型ラジアント
チューブ燃焼装置では、燃焼筒は、輻射率の向上には多
少の寄与はするものの、加熱には直接寄与しないにもか
かわらず、ガス燃料の燃焼を完結させるには不可欠のも
のであるが、その燃焼筒に起因して下記のように種々の
問題があった。即ち、部品点数が多くなることから、材
料費が高くなると共に、構成が複雑になって製造作業が
複雑になるためにコストアップの要因となり、低廉化を
図り難かった。又、燃焼筒が変形してラジアントチュー
ブに接触すると、ラジアントチューブにも異常を来たす
虞があり、あるいは、燃焼筒が焼損すると燃焼が不安定
となることから、ラジアントチューブの点検ばかりでな
く、燃焼筒の点検も必要となるが、燃焼筒はラジアント
チューブ内に位置することから、その燃焼筒の点検作業
が複雑となり、延いては、メンテナンスが複雑なものと
なっていた。By the way, in such a single-ended radiant tube combustion apparatus,
The heating is performed via a radiant tube. However, in the conventional single-ended radiant tube combustor, although the combustion cylinder does contribute to the improvement of the emissivity to some extent, it does not directly contribute to heating, but it is necessary to complete the combustion of the gas fuel. Although indispensable, there were various problems due to the combustion cylinder as described below. That is, since the number of parts increases, the material cost becomes high, and the structure becomes complicated and the manufacturing work becomes complicated, which causes a cost increase and it is difficult to reduce the cost. Also, if the combustion tube is deformed and comes into contact with the radiant tube, the radiant tube may also become abnormal, or if the combustion tube burns out, combustion becomes unstable, so not only inspection of the radiant tube but also combustion Although it is necessary to inspect the cylinder, since the combustion cylinder is located inside the radiant tube, the inspection work of the combustion cylinder is complicated, and the maintenance is complicated.
【０００４】本発明は、かかる実情に鑑みてなされたも
のであり、その目的は、シングルエンド型ラジアントチ
ューブ燃焼装置において、低廉化及びメンテナンスの簡
素化を図ることにある。The present invention has been made in view of the above circumstances, and an object thereof is to reduce the cost and simplify the maintenance in a single-ended radiant tube combustion device.
【０００５】[0005]
【課題を解決するための手段】〔請求項１記載の発明〕
請求項１に記載の特徴構成は、先端が閉塞されたラジア
ントチューブの基端側から先端側に向けて、ガス燃料を
前記ラジアントチューブの内周面に沿う筒状に供給する
燃料供給部と、前記燃料供給部から筒状に供給されるガ
ス燃料の内方側に燃焼用酸素含有ガスを旋回する状態で
供給する酸素含有ガス供給部と、前記ラジアントチュー
ブの中央部を通して、前記ラジアントチューブの先端側
から基端側に流動する燃焼ガスを排気する排気部とが設
けられて、炎を前記ラジアントチューブの内周面に沿っ
て前記ラジアントチューブの先端側に延びるように形成
し、燃焼ガスを前記ラジアントチューブ内の先端で反転
させて、前記炎の内方側を流動させて前記排気部から排
出するように構成されていることにある。請求項１に記
載の特徴構成によれば、燃料供給部にて、ガス燃料がラ
ジアントチューブの内周面に沿う筒状に供給され、酸素
含有ガス供給部にて、燃焼用酸素含有ガスが旋回する状
態で、燃料供給部から筒状に供給されるガス燃料の内方
側に供給されて、炎がラジアントチューブの内周面に沿
ってラジアントチューブの先端側に延びるように形成さ
れ、燃焼ガスが、ラジアントチューブ内の先端で反転し
て炎の内方側をラジアントチューブの基端側に向かって
流動して、排気部にて排出される。つまり、ガス燃料が
ラジアントチューブの内周面に沿う筒状に供給され、そ
のように筒状に供給されるガス燃料の内方側に、燃焼用
酸素含有ガスが旋回する状態で供給されることから、燃
焼用酸素含有ガスの遠心力により、ガス燃料がラジアン
トチューブの内周面に沿って流動しながら、燃焼用酸素
含有ガスとの混合が行われるので、炎がラジアントチュ
ーブの内周面に沿ってラジアントチューブの先端側に延
びるように形成される。燃焼ガスは、ラジアントチュー
ブ内の先端で反転して、炎の内方側をラジアントチュー
ブの基端側に向かって流動し、排気部にて排出される。
ラジアントチューブの内周面に沿ってラジアントチュー
ブの先端側に向かって筒状に流れる燃焼気流（以下、外
流と称する場合がある）と、その筒状の外流の内方側を
ラジアントチューブの基端側に向かって流動する燃焼気
流（以下、内流と称する場合がある）との境界部は燃焼
気流の乱れが発生し易く、ガス燃料と燃焼用酸素含有ガ
スとの混合はこの境界部分の影響を受け易いが、筒状に
流動するガス燃料の内方側を燃焼用酸素含有ガスが旋回
状態で流動することから、その燃焼用酸素含有ガスの遠
心力により、ガス燃料は内流から離れて流れ易くなるの
で、外流と内流との境界部に酸素濃度の高い層を生じさ
せて、その酸素濃度の高い層にて、炎の形成に対する内
流の影響を抑制することが可能となるので、燃焼を安定
して完結させることができるのである。つまり、従来の
如き燃焼筒を用いることなく、ラジアントチューブ内で
燃焼を安定して完結させることが可能となるので、燃焼
筒を用いない分、材料費が安くなると共に、構成が簡単
になって製造作業が簡単となることから、コストダウン
を図ることが可能となり、又、従来の如き燃焼筒の点検
が不要となる。従って、シングルエンド型ラジアントチ
ューブ燃焼装置において、低廉化及びメンテナンスの簡
素化を図ることができるようになった。Means for Solving the Problems [Invention of Claim 1]
The characteristic configuration according to claim 1 is a fuel supply unit that supplies gas fuel in a tubular shape along the inner peripheral surface of the radiant tube from the proximal end side of the radiant tube whose distal end is closed toward the distal end side. An oxygen-containing gas supply unit that supplies the oxygen-containing gas for combustion to the inner side of the gas fuel that is cylindrically supplied from the fuel supply unit and a central portion of the radiant tube, and the tip of the radiant tube An exhaust portion for exhausting the combustion gas flowing from the side to the base end side is provided, and a flame is formed so as to extend to the tip side of the radiant tube along the inner peripheral surface of the radiant tube, and the combustion gas is It is configured such that the tip end of the inside of the radiant tube is reversed so that the inside of the flame is made to flow and discharged from the exhaust portion. According to the characterizing feature of claim 1, the gas fuel is supplied in a tubular shape along the inner peripheral surface of the radiant tube in the fuel supply section, and the oxygen-containing gas for combustion is swirled in the oxygen-containing gas supply section. In this state, the gas is supplied to the inner side of the gas fuel that is cylindrically supplied from the fuel supply unit, and the flame is formed to extend along the inner peripheral surface of the radiant tube to the tip side of the radiant tube. However, it is reversed at the tip inside the radiant tube, flows inside the flame toward the base end side of the radiant tube, and is discharged at the exhaust part. That is, the gas fuel is supplied in a cylindrical shape along the inner peripheral surface of the radiant tube, and the oxygen-containing gas for combustion is supplied in a swirling state to the inner side of the gas fuel supplied in such a cylindrical shape. From the above, due to the centrifugal force of the oxygen-containing gas for combustion, the gas fuel flows along the inner peripheral surface of the radiant tube while being mixed with the oxygen-containing gas for combustion, so that the flame is generated on the inner peripheral surface of the radiant tube. It is formed so as to extend along the distal side of the radiant tube. The combustion gas reverses at the tip inside the radiant tube, flows inside the flame toward the base end side of the radiant tube, and is exhausted at the exhaust portion.
The combustion air flow that flows in a cylindrical shape along the inner peripheral surface of the radiant tube toward the tip side of the radiant tube (hereinafter, also referred to as “outflow”), and the inner side of the cylindrical outer flow is the base end of the radiant tube. The turbulence of the combustion airflow is likely to occur at the boundary with the combustion airflow that flows toward the side (hereinafter sometimes referred to as the inward flow), and the mixing of the gas fuel and the oxygen-containing gas for combustion is affected by this boundary. However, since the combustion oxygen-containing gas flows in a swirling state inside the tubular gas fuel, the centrifugal force of the combustion oxygen-containing gas causes the gas fuel to separate from the inflow. Since it becomes easier to flow, it is possible to generate a layer having a high oxygen concentration at the boundary between the outer flow and the inner flow, and to suppress the influence of the inner flow on the formation of the flame in the layer having a high oxygen concentration. , To ensure stable completion of combustion But they can. In other words, since it is possible to stably complete combustion in the radiant tube without using a conventional combustion cylinder, the material cost is reduced and the structure is simplified because the combustion cylinder is not used. Since the manufacturing work is simplified, the cost can be reduced, and the conventional inspection of the combustion cylinder is unnecessary. Therefore, in the single-ended radiant tube combustion device, it has become possible to reduce the cost and simplify the maintenance.
【０００６】〔請求項２記載の発明〕請求項２に記載の
特徴構成は、前記酸素含有ガス供給部へ燃焼用酸素含有
ガスを導く酸素含有ガス路が、前記酸素含有ガス供給部
からの燃焼用酸素含有ガス供給方向視にて、前記排気部
から排出される燃焼ガスを導く排気路の外周を囲む環状
で、且つ、前記排気路における出口側から燃焼用酸素含
有ガスが供給されるように構成され、前記酸素含有ガス
路及び前記排気路が、前記酸素含有ガス路を流れる燃焼
用酸素含有ガスと前記排気路を流れる燃焼ガスとの間で
熱交換させるように構成されていることにある。請求項
２に記載の特徴構成によれば、 燃焼ガスが排気路を
ラジアントチューブの先端側から基端側に向かう方向に
出口に向かって流動し、その排気路の外周を囲む環状の
酸素含有ガス路を燃焼用酸素含有ガスがラジアントチュ
ーブの基端側から先端側に向かう方向に流動し、酸素含
有ガス路を流れる燃焼用酸素含有ガスと排気路を流れる
燃焼ガスとの間で熱交換されて、燃焼ガスにて酸素含有
ガスが予熱される。そして、燃料供給部、酸素含有ガス
供給部、排気部は、記載順に外側から内側に向けて並ん
で、燃料供給部が最外周に位置することから、その燃料
供給部にガス燃料を導くための燃料路も、排気路の外周
を囲む環状の酸素含有ガス路の外周、即ち、最外周に位
置するので、排熱回収効率を高くすべく酸素含有ガス路
及び排気路の長さを長くするに当たっては、最外周の燃
料路に制限されること無く、長くすることが可能であ
る。つまり、燃料路を長くすること無く、酸素含有ガス
路及び排気路を長くして、排熱回収効率を高くすること
が可能となる。一方、従来では、図６に示すように、燃
料供給部４１、酸素含有ガス供給部４２、排気部４３
は、記載順に内側から外側に向けて並んで、燃料供給部
４１は最内周に位置することから、酸素含有ガス供給部
４２からの燃焼用酸素含有ガス供給方向視にて、酸素含
有ガス供給部４２へ燃焼用酸素含有ガスＡを導く酸素含
有ガス路４４は、燃料供給部４１にガス燃料Ｇを導くた
めの燃料路４５の外周を囲む環状に構成され、排気部４
３から排出される燃焼ガスＥを導く排気路４６は酸素含
有ガス路４４の外周を囲む環状に構成されて、燃料路４
５は最内周に位置するので、排熱回収効率を高くすべく
酸素含有ガス路４４及び排気路４６の長さを長くするに
当たっては、それらの内方側に位置する燃料路４５に規
制されることとなる。つまり、排熱回収効率を高くすべ
く、酸素含有ガス路４４及び排気路４６の長さを長くす
るには、それらに対応して燃料路４５も長くする必要が
あり、構成が複雑化する。従って、請求項２に記載の特
徴構成によれば、燃料路を長くすること無く、酸素含有
ガス路及び排気路を長くして、排熱回収効率を高くする
ことが可能となるので、構成を簡略化して低廉化を図り
ながら、排熱回収効率を高くして熱効率を向上すること
が可能となった。[Invention of Claim 2] In the characteristic configuration of Claim 2, the oxygen-containing gas passage for guiding the oxygen-containing gas for combustion to the oxygen-containing gas supply unit is a combustion chamber from the oxygen-containing gas supply unit. So that the combustion oxygen-containing gas is supplied from the outlet side of the exhaust passage in an annular shape surrounding the outer periphery of the exhaust passage that guides the combustion gas discharged from the exhaust portion. The oxygen-containing gas passage and the exhaust passage are configured to exchange heat between the combustion-use oxygen-containing gas flowing through the oxygen-containing gas passage and the combustion gas flowing through the exhaust passage. . According to the characteristic configuration of claim 2, the combustion gas flows in the exhaust passage toward the outlet in the direction from the distal end side to the proximal end side of the radiant tube, and the annular oxygen-containing gas surrounds the outer periphery of the exhaust passage. The oxygen-containing gas for combustion flows through the passage in the direction from the base end side to the tip side of the radiant tube, and heat exchange is performed between the oxygen-containing gas for combustion flowing through the oxygen-containing gas passage and the combustion gas flowing through the exhaust passage. The oxygen-containing gas is preheated by the combustion gas. Then, the fuel supply unit, the oxygen-containing gas supply unit, and the exhaust unit are arranged in order from the outer side to the inner side, and since the fuel supply unit is located at the outermost periphery, it is for guiding the gas fuel to the fuel supply unit. Since the fuel passage is also located at the outer circumference of the annular oxygen-containing gas passage that surrounds the outer circumference of the exhaust passage, that is, at the outermost circumference, when increasing the lengths of the oxygen-containing gas passage and the exhaust passage to increase the exhaust heat recovery efficiency. Can be made longer without being restricted to the outermost fuel passage. That is, it is possible to increase the exhaust heat recovery efficiency by lengthening the oxygen-containing gas passage and the exhaust passage without making the fuel passage longer. On the other hand, conventionally, as shown in FIG. 6, a fuel supply unit 41, an oxygen-containing gas supply unit 42, and an exhaust unit 43.
Are arranged in order from the inner side to the outer side, and the fuel supply section 41 is located at the innermost circumference. Therefore, when viewed from the direction of supplying the oxygen-containing gas for combustion from the oxygen-containing gas supply section 42, the oxygen-containing gas supply is performed. The oxygen-containing gas passage 44 that guides the combustion-use oxygen-containing gas A to the portion 42 is formed in an annular shape surrounding the outer periphery of the fuel passage 45 that guides the gas fuel G to the fuel supply portion 41, and the exhaust portion 4
The exhaust passage 46 for guiding the combustion gas E discharged from the fuel cell 3 is formed in an annular shape surrounding the outer periphery of the oxygen-containing gas passage 44,
Since No. 5 is located at the innermost circumference, when the lengths of the oxygen-containing gas passage 44 and the exhaust passage 46 are lengthened in order to increase the exhaust heat recovery efficiency, the fuel passage 45 located on the inner side of them is restricted. The Rukoto. That is, in order to increase the lengths of the oxygen-containing gas passage 44 and the exhaust passage 46 in order to increase the exhaust heat recovery efficiency, the fuel passage 45 also needs to be lengthened correspondingly, which complicates the configuration. Therefore, according to the characteristic configuration of claim 2, the oxygen-containing gas passage and the exhaust passage can be made longer without increasing the fuel passage, and the exhaust heat recovery efficiency can be improved. While simplifying and reducing the cost, it has become possible to improve the exhaust heat recovery efficiency and improve the thermal efficiency.
【０００７】[0007]
【発明の実施の形態】〔第１実施形態〕以下、図１ない
し図３に基づいて、本発明の第１実施形態を説明する。
尚、図１及び図３において、ガス燃料Ｇの流れを実線矢
印にて示し、燃焼用酸素含有ガスとしての燃焼用空気Ａ
の流れを一点鎖線矢印にて示し、燃焼ガスＥの流れを破
線矢印にて示す。図１ないし図３に示すように、シング
ルエンド型ラジアントチューブ燃焼装置は、先端が閉塞
されたラジアントチューブ１と、そのラジアントチュー
ブ１の基端側にそのラジアントチューブ１内でガス燃料
Ｇを燃焼させるように設けたバーナＢとを備えて構成し
てある。BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS.
1 and 3, the flow of the gas fuel G is shown by a solid line arrow, and the combustion air A as the combustion oxygen-containing gas is shown.
Of the combustion gas E is shown by a dashed arrow. As shown in FIGS. 1 to 3, a single-ended radiant tube combustion device burns a gas fuel G in the radiant tube 1 on the radiant tube 1 with the tip closed and on the proximal end side of the radiant tube 1. And a burner B provided as described above.
【０００８】バーナＢは、ラジアントチューブ１の基端
側から先端側に向けて、ガス燃料Ｇをラジアントチュー
ブ１の内周面に沿う筒状に供給する燃料供給部としての
複数の燃料噴出孔２と、複数の燃料噴出孔２から筒状に
供給されるガス燃料Ｇの内方側に燃焼用空気Ａを旋回す
る状態で供給する酸素含有ガス供給部としての空気吐出
口３と、ラジアントチューブ１の中央部を通して、ラジ
アントチューブ１の先端側から基端側に流動する燃焼ガ
スＥを排気する排気部としての排気口４とを設けて、炎
Ｆをラジアントチューブ１の内周面に沿ってラジアント
チューブ１の先端側に延びるように形成し、燃焼ガスＥ
をラジアントチューブ１内の先端で反転させて、炎Ｆの
内方側を流動させて排気口４から排出するように構成し
てある。The burner B has a plurality of fuel injection holes 2 as a fuel supply portion for supplying the gas fuel G in a tubular shape along the inner peripheral surface of the radiant tube 1 from the base end side to the tip end side of the radiant tube 1. And an air discharge port 3 as an oxygen-containing gas supply unit that supplies combustion air A in a swirling state to the inner side of a gas fuel G that is cylindrically supplied from a plurality of fuel ejection holes 2, and a radiant tube 1. An exhaust port 4 as an exhaust unit for exhausting the combustion gas E flowing from the distal end side to the proximal end side of the radiant tube 1 through the central part of the radiant tube 1, and the flame F along the inner peripheral surface of the radiant tube 1. The combustion gas E is formed so as to extend toward the tip side of the tube 1.
Is reversed at the tip of the inside of the radiant tube 1, and the inner side of the flame F is made to flow and discharged from the exhaust port 4.
【０００９】図１ないし図３に基づいて、バーナＢにつ
いて説明を加える。それぞれ円筒状で、記載順に大径と
なる内筒５、中間筒６及び外筒７を、同軸状に三重に重
ねて配設してある。外筒７をラジアントチューブ１の基
端に内嵌可能なように、外筒７の外径はラジアントチュ
ーブ１の内径と略同一にしてある。中間筒６の先端は外
筒７の先端よりも突出させ、内筒５の先端は中間筒６の
先端よりも突出させ、並びに、中間筒６の基端は外筒７
の基端よりも突出させ、内筒５の基端は中間筒６の基端
よりも突出させてある。The burner B will be described with reference to FIGS. 1 to 3. An inner cylinder 5, an intermediate cylinder 6 and an outer cylinder 7 each having a cylindrical shape and having a large diameter in the order described are arranged coaxially in a triple stack. The outer diameter of the outer tube 7 is substantially the same as the inner diameter of the radiant tube 1 so that the outer tube 7 can be fitted into the proximal end of the radiant tube 1. The tip of the intermediate cylinder 6 is projected more than the tip of the outer cylinder 7, the tip of the inner cylinder 5 is projected more than the tip of the intermediate cylinder 6, and the base end of the intermediate cylinder 6 is the outer cylinder 7.
The base end of the inner cylinder 5 is projected more than the base end of the intermediate cylinder 6.
【００１０】周方向に等間隔で複数（本実施形態では８
個）の燃料噴出孔２を穿設した環状体８を、外筒７の先
端縁と中間筒６の外周面とにより形成される環状の開口
部に嵌め込み、外筒７の基端は閉塞して、中間筒６と外
筒７との間に形成される環状の空間を、複数の燃料噴出
孔２にガス燃料Ｇを導く燃料路９として機能させるよう
にし、外筒７の基端側に、ガス燃料Ｇを燃料路９に受け
入れる燃料受入口１０を設けてある。A plurality (8 in this embodiment) are arranged at equal intervals in the circumferential direction.
The annular body 8 having the fuel injection holes 2 is fitted into an annular opening formed by the leading edge of the outer cylinder 7 and the outer peripheral surface of the intermediate cylinder 6, and the base end of the outer cylinder 7 is closed. Then, the annular space formed between the intermediate cylinder 6 and the outer cylinder 7 is made to function as the fuel passage 9 for guiding the gas fuel G to the plurality of fuel ejection holes 2, and the base end side of the outer cylinder 7 is provided. A fuel inlet 10 for receiving the gas fuel G in the fuel passage 9 is provided.
【００１１】中間筒６の先端縁と内筒５の外周面とによ
り形成される環状の開口部を空気吐出口３として機能さ
せ、中間筒６の基端は閉塞し、内筒５と中間筒６との間
に形成される環状の空間を、空気吐出口３に燃焼用空気
Ａを導く酸素含有ガス路としての空気路１１として機能
させるようにし、その空気路１１内に旋回羽根１２を配
設して、空気路１１を流動する燃焼用空気Ａがその旋回
羽根１２を通過することにより旋回流動するように構成
し、中間筒６の基端側に、燃焼用空気Ａを受け入れる空
気受入口１３を設けてある。An annular opening formed by the tip edge of the intermediate cylinder 6 and the outer peripheral surface of the inner cylinder 5 functions as the air discharge port 3, and the base end of the intermediate cylinder 6 is closed, and the inner cylinder 5 and the intermediate cylinder 5 are closed. 6 is made to function as an air passage 11 as an oxygen-containing gas passage for guiding the combustion air A to the air discharge port 3, and the swirl vanes 12 are arranged in the air passage 11. When the combustion air A flowing through the air passage 11 passes through the swirl vanes 12, the combustion air A swirls and flows, and the air inlet for receiving the combustion air A is provided on the base end side of the intermediate cylinder 6. 13 is provided.
【００１２】内筒５の先端の円形の開口部を排気口４と
して機能させ、内筒５の内部を、排気口４から排出され
る燃焼ガスＥを導く排気路１４として機能させ、内筒５
の基端開口部を排気路１４の出口１５として機能させる
ように構成してある。The circular opening at the tip of the inner cylinder 5 functions as the exhaust port 4, and the inside of the inner cylinder 5 functions as the exhaust passage 14 for guiding the combustion gas E discharged from the exhaust port 4, and the inner cylinder 5
Is configured to function as the outlet 15 of the exhaust passage 14.
【００１３】つまり、空気吐出口３へ燃焼用空気Ａを導
く空気路１１を、空気吐出口３からの燃焼用空気吐出方
向視（燃焼用酸素含有ガス供給方向視に相当する）に
て、排気口４から排出される燃焼ガスＥを導く排気路１
４の外周を囲む環状で、且つ、排気路１４における出口
１５側から燃焼用空気Ａを供給するように構成してあ
る。That is, the air passage 11 for guiding the combustion air A to the air discharge port 3 is exhausted when viewed from the direction in which the combustion air is discharged from the air discharge port 3 (corresponding to the direction in which the oxygen-containing gas for combustion is supplied). Exhaust passage 1 for guiding the combustion gas E discharged from the mouth 4
The combustion air A is supplied from the outlet 15 side of the exhaust passage 14 in an annular shape surrounding the outer periphery of the exhaust passage 14.
【００１４】上述のように構成したバーナＢを、外筒７
の先端側をラジアントチューブ１の基端に内嵌した状態
で、ラジアントチューブ１に組み付けてある。燃料受入
口１０に、都市ガス等のガス燃料Ｇを導く燃料供給路１
６を接続し、空気受入口１３には、給気ファン１７から
の燃焼用空気Ａを導く空気供給路１８を接続し、並び
に、排気路４の出口１５に、排気ファン１９にて吸気さ
れる燃焼ガスＥを導く燃焼ガス導出路２０を接続してあ
る。但し、排気ファン１９は、ラジアントチューブ１の
内圧を負圧に保つ必要のある場合のみにおいて使用する
ものである。The burner B constructed as described above is installed in the outer cylinder 7
Is attached to the radiant tube 1 in a state where the tip end side of the is internally fitted to the base end of the radiant tube 1. A fuel supply path 1 for introducing a gas fuel G such as city gas to a fuel inlet 10.
6, an air supply path 18 for guiding the combustion air A from the air supply fan 17 is connected to the air receiving opening 13, and an exhaust fan 19 sucks air into the outlet 15 of the exhaust path 4. A combustion gas outlet 20 for guiding the combustion gas E is connected. However, the exhaust fan 19 is used only when it is necessary to keep the internal pressure of the radiant tube 1 at a negative pressure.
【００１５】そして、燃料供給路１６を通じて供給され
るガス燃料Ｇを燃料路９を通じて導いて、複数の燃料噴
出孔２から、ラジアントチューブ１の内周面に沿う筒状
に噴出し、空気供給路１８を通じて供給される燃焼用空
気Ａを空気路１１を通じて導くと共に旋回羽根１２にて
旋回させて、燃焼用空気Ａを、環状の空気吐出口３か
ら、複数の燃料噴出孔２から筒状に噴出されるガス燃料
Ｇの内方側に旋回する状態で吐出して、炎Ｆをラジアン
トチューブ１の内周面に沿ってラジアントチューブ１の
先端側に延びるように形成し、燃焼ガスＥをラジアント
チューブ１内の先端で反転させて、炎Ｆの内方側を流動
させて排気口４から排気路１４へ排出させて、排気路１
４を通じて導いて、燃焼ガス導出路２０を通じて排出す
るように構成してある。Then, the gas fuel G supplied through the fuel supply passage 16 is guided through the fuel passage 9 and is ejected from the plurality of fuel ejection holes 2 into a cylindrical shape along the inner peripheral surface of the radiant tube 1 to provide an air supply passage. Combustion air A supplied through 18 is guided through an air passage 11 and swirled by swirl vanes 12, so that the combustion air A is ejected from an annular air discharge port 3 into a plurality of fuel ejection holes 2 in a tubular shape. The gas fuel G is discharged while swirling inward, and the flame F is formed so as to extend along the inner peripheral surface of the radiant tube 1 toward the tip side of the radiant tube 1, and the combustion gas E is radiant tube. 1 is reversed at the tip end to cause the inside of the flame F to flow and be discharged from the exhaust port 4 to the exhaust passage 14,
4 and discharge through the combustion gas discharge passage 20.
【００１６】上述のように構成したシングルエンド型ラ
ジアントチューブ燃焼装置は、例えば、炉内を加熱する
用途で用いる場合は、図１に示すように、炉壁３０に形
成したチューブ挿入孔３１に、ラジアントチューブ１を
その先端側から炉内３２に突出するように挿入した状態
で設けて、ラジアントチューブ１を介して炉内３２を間
接加熱する。When the single-ended radiant tube combustor constructed as described above is used for heating the inside of a furnace, for example, as shown in FIG. 1, a tube insertion hole 31 formed in a furnace wall 30 The radiant tube 1 is provided so as to project from the tip side thereof into the furnace 32, and the furnace 32 is indirectly heated via the radiant tube 1.
【００１７】以下、本発明の第２実施形態を説明する
が、第２実施形態において第１実施形態と同じ構成要素
や同じ作用を有する構成要素については、重複説明を避
けるために、同じ符号を付すことにより説明を省略し、
主として、第１実施形態と異なる構成を説明する。Hereinafter, a second embodiment of the present invention will be described. In the second embodiment, the same reference numerals are given to the same constituent elements or constituent elements having the same operation as those of the first embodiment in order to avoid redundant description. The explanation is omitted by attaching
A configuration different from that of the first embodiment will be mainly described.
【００１８】図４及び図５に示すように、第２実施形態
においては、内筒５に、その内外に突出する状態で、複
数の帯状のフィン２１を内筒５の長手方向に沿わせた姿
勢で周方向に間隔を開けて並べて付設し、第１実施形態
と同様に、空気吐出口３へ燃焼用空気Ａを導く空気路１
１を、空気吐出口３からの燃焼用空気吐出方向視にて、
排気口４から排出される燃焼ガスＥを導く排気路１４の
外周を囲む環状で、且つ、排気路１４における出口１５
側から燃焼用空気Ａを供給するように構成してある。そ
して、空気路１１及び排気路１４を、空気路１１を流れ
る燃焼用空気Ａと排気路１４を流れる燃焼ガスＥとの間
で熱交換させるように構成して、燃焼ガスＥの排熱を回
収して燃焼用空気Ａを予熱する熱交換器２２を設けてあ
る。As shown in FIGS. 4 and 5, in the second embodiment, a plurality of strip-shaped fins 21 are arranged on the inner cylinder 5 in the longitudinal direction of the inner cylinder 5 so as to project inward and outward. An air passage 1 which is attached side by side in a circumferential direction with an attitude and guides the combustion air A to the air discharge port 3 as in the first embodiment.
1 in the combustion air discharge direction from the air discharge port 3,
An outlet 15 in the exhaust passage 14 that is annular and surrounds the outer periphery of the exhaust passage 14 that guides the combustion gas E discharged from the exhaust outlet 4.
The combustion air A is supplied from the side. Then, the air passage 11 and the exhaust passage 14 are configured to exchange heat between the combustion air A flowing in the air passage 11 and the combustion gas E flowing in the exhaust passage 14, and the exhaust heat of the combustion gas E is recovered. A heat exchanger 22 for preheating the combustion air A is provided.
【００１９】そして、上述のように熱交換器２２を設け
るに当たっては、外筒７は第１実施形態と同様に、ラジ
アントチューブ１の基端側に近づけた状態としてある
が、中間筒６及び外筒７は、第１実施形態に比べて、ラ
ジアントチューブ１の先端から基端に向く方向に長く延
ばして、空気路１１及び排気路１４を長くして、排熱回
収効率を高くするようにしてある。In providing the heat exchanger 22 as described above, the outer cylinder 7 is in a state of being brought close to the proximal end side of the radiant tube 1 as in the first embodiment, but the intermediate cylinder 6 and the outer cylinder 7 are Compared to the first embodiment, the cylinder 7 is elongated in the direction from the distal end to the proximal end of the radiant tube 1 to lengthen the air passage 11 and the exhaust passage 14 to increase the exhaust heat recovery efficiency. is there.
【００２０】そして、そのように、排熱回収効率を高く
すべく空気路１１及び排気路１４を長くするに当たって
は、燃料路９は、空気路１１、排気路１４及び燃料路９
の配置形態において最外周に位置するので、空気路１１
及び排気路１４は、最外周の燃料路９に制限されること
無く、長くすることが可能である。つまり、燃料路９を
長くすること無く、空気路１１及び排気路１４を長くし
て、排熱回収効率を高くすることが可能である。In order to lengthen the air passage 11 and the exhaust passage 14 in order to increase the exhaust heat recovery efficiency, the fuel passage 9 is the air passage 11, the exhaust passage 14 and the fuel passage 9.
Since it is located at the outermost circumference in the arrangement form of
The exhaust passage 14 can be made longer without being limited to the outermost fuel passage 9. That is, it is possible to increase the exhaust heat recovery efficiency by lengthening the air passage 11 and the exhaust passage 14 without lengthening the fuel passage 9.
【００２１】〔別実施形態〕次に別実施形態を説明す
る。
（イ） 燃料供給部は、上記の実施形態において例示し
た如き環状体８に穿設した複数の燃料噴出孔２にて構成
する場合に限定されるものではない。例えば、環状体８
に周方向に間隔を隔てて複数の筒状ノズルを取り付け
て、それら複数の筒状ノズルにて構成したり、環状体８
に環状のスリットを形成して、その環状のスリットにて
構成しても良い。又、燃料供給部を、上記の実施形態の
如き複数の燃料噴出孔２にて構成する場合、燃料噴出孔
２の個数は変更可能である。Another Embodiment Next, another embodiment will be described. (A) The fuel supply unit is not limited to the case where the fuel supply unit is composed of the plurality of fuel ejection holes 2 formed in the annular body 8 as exemplified in the above embodiment. For example, the annular body 8
A plurality of tubular nozzles are attached to the circumferential direction at intervals, and the plurality of tubular nozzles are used to form the annular body 8.
A ring-shaped slit may be formed in the above, and the ring-shaped slit may be used. Further, when the fuel supply unit is composed of a plurality of fuel ejection holes 2 as in the above embodiment, the number of fuel ejection holes 2 can be changed.
【００２２】（ロ） 酸素含有ガス供給部からラジアン
トチューブ１内に供給する燃焼用酸素含有ガスとして
は、上記の実施形態において例示した空気以外に、空気
にラジアントチューブ１から排出した燃焼ガスＥを混合
したものや、酸素含有率を高くした酸素富化空気等、種
々のものを用いることができる。(B) As the oxygen-containing gas for combustion supplied from the oxygen-containing gas supply unit into the radiant tube 1, in addition to the air exemplified in the above embodiment, the combustion gas E exhausted from the radiant tube 1 is added to the air. Various materials such as mixed materials and oxygen-enriched air having a high oxygen content can be used.
【図１】第１実施形態に係るシングルエンド型ラジアン
トチューブ燃焼装置のラジアントチューブ長手方向に沿
う面での断面図FIG. 1 is a sectional view of a single-ended radiant tube combustion device according to a first embodiment, taken along a plane along a longitudinal direction of a radiant tube.
【図２】第１実施形態に係るシングルエンド型ラジアン
トチューブ燃焼装置の要部のラジアントチューブ長手方
向に沿う面での断面図FIG. 2 is a sectional view of a main part of the single-ended radiant tube combustion device according to the first embodiment, taken along a plane along a radiant tube longitudinal direction.
【図３】図２におけるイ−イ矢視図FIG. 3 is a view taken along the arrow EE in FIG.
【図４】第２実施形態に係るシングルエンド型ラジアン
トチューブ燃焼装置の要部のラジアントチューブ長手方
向に沿う面での断面図FIG. 4 is a cross-sectional view of a main part of a single-ended radiant tube combustion device according to a second embodiment, taken along a plane along a radiant tube longitudinal direction.
【図５】図４におけるロ−ロ矢視図5 is a view on arrow in FIG.
【図６】従来のシングルエンド型ラジアントチューブ燃
焼装置のラジアントチューブ長手方向に沿う面での断面
図FIG. 6 is a cross-sectional view of a conventional single-ended radiant tube combustor taken along a plane along the radiant tube longitudinal direction.
１ ラジアントチューブ ２ 燃料供給部 ３ 酸素含有ガス供給部 ４ 排気部 １１ 酸素含有ガス路 １４ 排気路 Ａ 燃焼用酸素含有ガス Ｅ 燃焼ガス Ｆ 炎 Ｇ ガス燃料 1 Radiant tube 2 Fuel supply section 3 Oxygen-containing gas supply unit 4 exhaust 11 Oxygen-containing gas path 14 exhaust path A Oxygen-containing gas for combustion E Combustion gas F flame G gas fuel
Claims (2)
基端側から先端側に向けて、ガス燃料を前記ラジアント
チューブの内周面に沿う筒状に供給する燃料供給部と、 前記燃料供給部から筒状に供給されるガス燃料の内方側
に燃焼用酸素含有ガスを旋回する状態で供給する酸素含
有ガス供給部と、 前記ラジアントチューブの中央部を通して、前記ラジア
ントチューブの先端側から基端側に流動する燃焼ガスを
排気する排気部とが設けられて、 炎を前記ラジアントチューブの内周面に沿って前記ラジ
アントチューブの先端側に延びるように形成し、燃焼ガ
スを前記ラジアントチューブ内の先端で反転させて、前
記炎の内方側を流動させて前記排気部から排出するよう
に構成されているシングルエンド型ラジアントチューブ
燃焼装置。1. A fuel supply unit for supplying gas fuel in a tubular shape along the inner peripheral surface of the radiant tube from the base end side to the front end side of the radiant tube whose tip is closed, and from the fuel supply unit. An oxygen-containing gas supply unit that supplies the combustion-containing oxygen-containing gas in a swirling state to the inner side of the gas fuel that is supplied in a cylindrical shape, and through the central portion of the radiant tube, from the distal end side to the proximal end side of the radiant tube. An exhaust portion for exhausting the combustion gas flowing in the radiant tube is formed to extend the flame along the inner peripheral surface of the radiant tube to the tip side of the radiant tube. The single-ended radiant tube combustor configured to be turned over to flow inside the flame to be discharged from the exhaust section.
有ガスを導く酸素含有ガス路が、前記酸素含有ガス供給
部からの燃焼用酸素含有ガス供給方向視にて、前記排気
部から排出される燃焼ガスを導く排気路の外周を囲む環
状で、且つ、前記排気路における出口側から燃焼用酸素
含有ガスが供給されるように構成され、 前記酸素含有ガス路及び前記排気路が、前記酸素含有ガ
ス路を流れる燃焼用酸素含有ガスと前記排気路を流れる
燃焼ガスとの間で熱交換させるように構成されている請
求項１記載のシングルエンド型ラジアントチューブ燃焼
装置。2. An oxygen-containing gas passage for guiding a combustion oxygen-containing gas to the oxygen-containing gas supply section is discharged from the exhaust section when viewed from the combustion-containing oxygen-containing gas supply direction from the oxygen-containing gas supply section. A ring surrounding the outer circumference of an exhaust passage that guides the combustion gas, and is configured so that the oxygen-containing gas for combustion is supplied from the outlet side of the exhaust passage, wherein the oxygen-containing gas passage and the exhaust passage are the oxygen. The single-ended radiant tube combustion apparatus according to claim 1, wherein heat is exchanged between the combustion oxygen-containing gas flowing through the containing gas passage and the combustion gas flowing through the exhaust passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002083094A JP3942466B2 (en) | 2002-03-25 | 2002-03-25 | Single-ended radiant tube combustion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002083094A JP3942466B2 (en) | 2002-03-25 | 2002-03-25 | Single-ended radiant tube combustion device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003279001A true JP2003279001A (en) | 2003-10-02 |
| JP3942466B2 JP3942466B2 (en) | 2007-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002083094A Expired - Fee Related JP3942466B2 (en) | 2002-03-25 | 2002-03-25 | Single-ended radiant tube combustion device |
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| JP (1) | JP3942466B2 (en) |
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