JP6833299B2 - Hydrogen gas combustion device - Google Patents

Hydrogen gas combustion device Download PDF

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JP6833299B2
JP6833299B2 JP2018173355A JP2018173355A JP6833299B2 JP 6833299 B2 JP6833299 B2 JP 6833299B2 JP 2018173355 A JP2018173355 A JP 2018173355A JP 2018173355 A JP2018173355 A JP 2018173355A JP 6833299 B2 JP6833299 B2 JP 6833299B2
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hydrogen gas
supply pipe
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脩平 田口
脩平 田口
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Chugai Ro Co Ltd
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Description

本発明は、水素ガス供給管を通して供給された水素ガスを空気と混合させて燃焼させる水素ガス燃焼装置に関するものである。特に、水素ガスを空気と混合させて燃焼させる場合に、水素ガスの燃焼速度が速く、局所的な温度上昇が生じたり、最高火炎温度が高くなったりして、ＮＯｘの発生量が多くなるのを簡単かつ適切に抑制できるようにした点に特徴を有するものである。 The present invention relates to a hydrogen gas combustion apparatus that mixes hydrogen gas supplied through a hydrogen gas supply pipe with air and burns it. In particular, when hydrogen gas is mixed with air and burned, the combustion speed of hydrogen gas is high, a local temperature rise occurs, and the maximum flame temperature rises, resulting in a large amount of NOx generated. It is characterized in that it can be easily and appropriately suppressed.

従来から、水素ガス供給管を通して導かれた水素ガスを空気と混合させて燃焼させるようにした水素ガス燃焼装置においては、水素ガスの燃焼速度が速いために、局所的な温度上昇が起こりやすく、また最高火炎温度も高くなって、ＮＯｘの発生量が多くなることが知られている。 Conventionally, in a hydrogen gas combustion device in which hydrogen gas guided through a hydrogen gas supply pipe is mixed with air and burned, the combustion speed of hydrogen gas is high, so that a local temperature rise is likely to occur. It is also known that the maximum flame temperature also increases and the amount of NOx generated increases.

そして、従来においては、特許文献１に示されるように、複数の炎孔から水素ガスを噴出させて、拡散燃焼方式により水素を燃焼させるようにした水素燃焼装置において、隣接する炎孔の両端間距離及び単位炎孔あたり出力を制御するようにして、水素ガスの燃焼時におけるＮＯｘの発生を抑制するようにしたものが提案されている。 Conventionally, as shown in Patent Document 1, in a hydrogen combustion device in which hydrogen gas is ejected from a plurality of flame holes to burn hydrogen by a diffusion combustion method, between both ends of adjacent flame holes. It has been proposed to control the distance and the output per unit flame hole to suppress the generation of NOx during combustion of hydrogen gas.

しかし、特許文献１に示されるように、水素ガスの燃焼時におけるＮＯｘの発生を抑制するため、隣接する炎孔の両端間距離及び単位炎孔あたり出力を制御する作業は非常に面倒であり、簡単にＮＯｘの発生を抑制することが困難であり、またこの特許文献１の実施例に示されるように、炎孔を多数配置させるようにすると、この燃焼装置全体が大きくなると共に、コストも高くつくという問題があった。 However, as shown in Patent Document 1, in order to suppress the generation of NOx during combustion of hydrogen gas, the work of controlling the distance between both ends of adjacent flame holes and the output per unit flame hole is very troublesome. It is difficult to easily suppress the generation of NOx, and as shown in the examples of Patent Document 1, if a large number of flame holes are arranged, the entire combustion apparatus becomes large and the cost is high. There was a problem of getting on.

また、従来においては、特許文献２に示されるように、水素ガスを供給するバーナーガス管の内周側に空気管を保持させた二重管としたバーナーノズルにおいて、外周側のバーナーガス管を流れる燃料ガスの水素ガス流がノズル噴出直後に内周側空気流と速やかに混合するように、外周側ガス管の外壁をノズル先端部において管芯に向けて傾斜させるようにした水素用低ＮＯｘバーナーが提案されている。 Further, conventionally, as shown in Patent Document 2, in a burner nozzle having a double pipe in which an air pipe is held on the inner peripheral side of the burner gas pipe for supplying hydrogen gas, the burner gas pipe on the outer peripheral side is used. Low NOx for hydrogen in which the outer wall of the outer gas pipe is inclined toward the tube core at the tip of the nozzle so that the hydrogen gas flow of the flowing fuel gas quickly mixes with the inner peripheral side air flow immediately after the nozzle is ejected. A burner has been proposed.

しかし、特許文献２に示されるものにおいては、外周側ガス管のノズル先端部における傾斜と、外周側ガス管の導出口の口径とによって内周側の空気管から吸引される空気量が変化し、水素の燃焼を適切に制御してＮＯｘの発生を簡単に抑制することが困難であり、またこれらの条件を適切に設定しないと、逆火等が生じるという問題もあった。 However, in the one shown in Patent Document 2, the amount of air sucked from the air pipe on the inner peripheral side changes depending on the inclination of the nozzle tip of the outer peripheral gas pipe and the diameter of the outlet of the outer gas pipe. It is difficult to appropriately control the combustion of hydrogen to easily suppress the generation of NOx, and if these conditions are not set appropriately, there is a problem that flashback or the like occurs.

また、従来においては、特に、燃焼用のガスとして水素ガスを用いたものではないが、特許文献３に示されるように、エアー噴出部内に設けたガス供給管の先端部に主ガス噴出部を設けると共に、ガス供給管の周面に複数の保炎用ガス噴出部を設ける一方、ガス供給管の周面から径方向外側に延びる円盤状の保炎板を設け、この保炎板に複数の小孔を設けると共に、この保炎板をガス供給管に沿ってスライドさせて、前記の保炎用ガス噴出部をこの保炎板によって開閉させるようにしたものが示されている。 Further, conventionally, hydrogen gas is not particularly used as the combustion gas, but as shown in Patent Document 3, the main gas ejection portion is provided at the tip of the gas supply pipe provided in the air ejection portion. Along with the provision, a plurality of flame-retaining gas ejection portions are provided on the peripheral surface of the gas supply pipe, while a disk-shaped flame-retaining plate extending radially outward from the peripheral surface of the gas supply pipe is provided, and a plurality of flame-retaining plates are provided. A small hole is provided, and the flame-retaining plate is slid along the gas supply pipe so that the flame-retaining gas ejection portion is opened and closed by the flame-retaining plate.

しかし、燃焼用のガスとして水素ガスを用いた場合において、特許文献３に示されるように、ガス供給管の周面から径方向外側に延びる円盤状の保炎板に複数の小孔を設けると、ガス供給管の近くに設けられた前記の保炎板における小孔を通して導かれたエアーと、ガス供給管の先端部に設けられた主ガス噴出部から噴出された水素ガスとがすぐに混合されて燃焼され、水素ガスの燃焼時におけるＮＯｘの発生が多くなるという問題があった。 However, when hydrogen gas is used as the combustion gas, as shown in Patent Document 3, if a plurality of small holes are provided in the disk-shaped flame holding plate extending radially outward from the peripheral surface of the gas supply pipe. , The air guided through the small hole in the flame holding plate provided near the gas supply pipe and the hydrogen gas ejected from the main gas ejection part provided at the tip of the gas supply pipe are immediately mixed. There is a problem that NOx is generated more when the hydrogen gas is burned.

特開２０１２−３２０８４号公報Japanese Unexamined Patent Publication No. 2012-32084 特公昭６０−１４２５６号公報Special Publication No. 60-14256 特開２０１７−１８１００５号公報JP-A-2017-181005

本発明は、水素ガス供給管を通して導かれた水素ガスを空気と混合させて燃焼させる水素ガス燃焼装置における前記のような問題を解決することを課題とするものである。 An object of the present invention is to solve the above-mentioned problems in a hydrogen gas combustion apparatus in which hydrogen gas guided through a hydrogen gas supply pipe is mixed with air and burned.

すなわち、本発明における水素ガス燃焼装置においては、水素ガスを空気と混合させて燃焼させる場合に、水素ガスの燃焼速度が速く、局所的な温度上昇が生じたり、最高火炎温度が高くなったりして、ＮＯｘの発生量が多くなるのを簡単かつ適切に抑制できるようにすることを課題とするものである。 That is, in the hydrogen gas combustion apparatus of the present invention, when hydrogen gas is mixed with air and burned, the combustion speed of hydrogen gas is high, a local temperature rise occurs, and the maximum flame temperature rises. Therefore, it is an object of the present invention to make it possible to easily and appropriately suppress an increase in the amount of NOx generated.

本発明における水素ガス燃焼装置においては、前記のような課題を解決するため、水素ガス供給管を通して供給された水素ガスを空気と混合させて燃焼させる水素ガス燃焼装置において、水素ガスを供給する水素ガス供給管の外周側に燃焼用の空気を供給する空気供給管を設け、前記の水素ガス供給管の先端部に水素ガスを前方に噴出させる噴出口を設けると共に、前記の噴出口よりも上流側の位置に、水素ガス供給管の外周面から半径方向外方に向かう閉塞された保炎部材を空気供給管の内周面と所要間隔を介するように設け、前記の保炎部材の外周面と空気供給管の内周面との間に空気供給管内を流れる空気を水素ガス供給管の先端側に導く案内通路を形成し、前記の保炎部材の厚み方向上流側の外周部に、空気供給管に向かうように下流側から上流側に傾斜した傾斜案内部を設け、この傾斜案内部に沿って空気供給管内を流れる空気を前記の案内通路に導くようにした。 In the hydrogen gas combustion apparatus of the present invention, in order to solve the above-mentioned problems, in the hydrogen gas combustion apparatus in which the hydrogen gas supplied through the hydrogen gas supply pipe is mixed with air and burned, the hydrogen supplied by the hydrogen gas is supplied. An air supply pipe for supplying combustion air is provided on the outer peripheral side of the gas supply pipe, and an outlet for ejecting hydrogen gas forward is provided at the tip of the hydrogen gas supply pipe, and upstream of the outlet. A closed flame-retaining member extending outward in the radial direction from the outer peripheral surface of the hydrogen gas supply pipe is provided at a position on the side so as to pass through the inner peripheral surface of the air supply pipe and a required interval, and the outer peripheral surface of the flame-retaining member. A guide passage is formed between the air and the inner peripheral surface of the air supply pipe to guide the air flowing in the air supply pipe to the tip end side of the hydrogen gas supply pipe, and the air is formed on the outer peripheral portion on the upstream side in the thickness direction of the flame holding member. An inclined guide portion inclined from the downstream side to the upstream side was provided so as to face the supply pipe, and the air flowing in the air supply pipe along the inclined guide portion was guided to the guide passage .

ここで、本発明における水素ガス燃焼装置のように構成すると、空気供給管内を流れる燃焼用の空気が、前記の水素ガス供給管の先端部における噴出口よりも上流側の位置に設けた水素ガス供給管の外周面から半径方向外方に向かう閉塞された保炎部材の位置に導かれると、この空気が保炎部材の外周面と空気供給管の内周面との間の案内通路を通して整流された状態で水素ガス供給管の先端側に導かれ、前記の水素ガス供給管の先端部における水素ガスを噴出させる噴出口から離れた空気供給管の内周面側から徐々に前記の噴出口から噴出された水素ガスに向けて導かれて接触し、水素ガスが徐々に燃焼されるようになる。 Here, when configured like the hydrogen gas combustion device in the present invention, the combustion air flowing in the air supply pipe is provided at a position upstream of the ejection port at the tip of the hydrogen gas supply pipe. When guided from the outer peripheral surface of the supply pipe to the position of the closed flame-retaining member outward in the radial direction, this air is rectified through the guide passage between the outer peripheral surface of the flame-retaining member and the inner peripheral surface of the air supply pipe. In this state, it is guided to the tip side of the hydrogen gas supply pipe, and gradually from the inner peripheral surface side of the air supply pipe away from the spout at the tip of the hydrogen gas supply pipe to eject the hydrogen gas. The hydrogen gas is guided toward and contacts the hydrogen gas ejected from the gas, and the hydrogen gas is gradually burned.

そして、このように保炎部材の外周面と空気供給管の内周面との間の案内通路を通して水素ガス供給管の先端側に導かれた空気が、前記の水素ガス供給管の先端部における噴出口から前方に噴出される水素ガスから離れた空気供給管の内周面から徐々に前記の水素ガスと接触して燃焼されると、水素ガスの燃焼速度が速くなるのが抑制されて、局所的に温度が上昇するのが防止されると共に、最高火炎温度が高くなるのも抑制され、ＮＯｘの発生量が多くなるのが防止されるようになる。 Then, the air guided to the tip end side of the hydrogen gas supply pipe through the guide passage between the outer peripheral surface of the flame holding member and the inner peripheral surface of the air supply pipe in this way is at the tip end portion of the hydrogen gas supply pipe. When the inner peripheral surface of the air supply pipe away from the hydrogen gas ejected forward from the spout is gradually contacted with the hydrogen gas and burned, the increase in the combustion speed of the hydrogen gas is suppressed, In addition to preventing the temperature from rising locally, the increase in the maximum flame temperature is also suppressed, and the amount of NOx generated is prevented from increasing.

また、本発明における水素ガス燃焼装置において、前記のように水素ガス供給管の外周面から半径方向外方に向かう閉塞された保炎部材の外周面と空気供給管の内周面とが所要間隔を介するように設けるにあたり、前記の空気供給管の内径に対する保炎部材の外径の比を０．９０〜０．９５の範囲にすることが好ましい。このように空気供給管の内径に対する保炎部材の外径の比を０．９０〜０．９５の範囲にすると、空気供給管内を流れる空気が、保炎部材の外周面と空気供給管の内周面との間の案内通路を通して整流されて流速が速められ、この状態で、適当量の空気が空気供給管の内周面に沿って水素ガス供給管の先端側に導かれ、このように導かれた空気が前記の水素ガス供給管の先端部における噴出口から前方に噴出された水素ガスと徐々に接触して燃焼されるようになり、水素ガスの燃焼速度が速くなるのが確実に抑制され、局所的に温度が上昇するのが十分に防止されると共に、最高火炎温度が高くなるのもさらに抑制されて、ＮＯｘの発生量が多くなるのが一層抑制されるようになる。 Further, in the hydrogen gas combustion apparatus of the present invention, as described above, the outer peripheral surface of the closed flame-retaining member extending outward in the radial direction from the outer peripheral surface of the hydrogen gas supply pipe and the inner peripheral surface of the air supply pipe are required to be spaced apart from each other. It is preferable that the ratio of the outer diameter of the flame-retaining member to the inner diameter of the air supply pipe is in the range of 0.99 to 0.95. When the ratio of the outer diameter of the flame-retaining member to the inner diameter of the air supply pipe is set in the range of 0.99 to 0.95, the air flowing in the air supply pipe flows between the outer peripheral surface of the flame-retaining member and the inside of the air supply pipe. It is rectified through the guide passage to the peripheral surface to increase the flow velocity, and in this state, an appropriate amount of air is guided along the inner peripheral surface of the air supply pipe to the tip side of the hydrogen gas supply pipe, thus. The guided air gradually comes into contact with the hydrogen gas ejected forward from the ejection port at the tip of the hydrogen gas supply pipe and is burned, so that the combustion speed of the hydrogen gas is surely increased. It is suppressed to sufficiently prevent the temperature from rising locally, and the increase in the maximum flame temperature is further suppressed, so that the increase in the amount of NOx generated is further suppressed.

また、本発明における水素ガス燃焼装置においては、前記のように水素ガス供給管の外周面から半径方向外方に向かう閉塞された保炎部材の外周面と空気供給管の内周面とが所要間隔を介するように設けるにあたり、保炎部材の厚み方向上流側の外周部に、空気供給管に向かうように下流側から上流側に傾斜した傾斜案内部を設け、この傾斜案内部に沿って空気供給管内を流れる空気を前記の案内通路に導くようにした。このようにすると、空気供給管内を流れる空気が、保炎部材に設けた前記の傾斜案内部に沿って保炎部材の外周面と空気供給管の内周面との間の案内通路に適切に導かれ、このように導かれた空気がこの案内通路を通してより整流された状態で水素ガス供給管の先端側に導かれて、水素ガスを噴出させる噴出口から離れた位置で水素ガスと接触するようになり、ＮＯｘの発生がより安定して十分に抑制されるようになる。 Further, in the hydrogen gas combustion apparatus of the present invention, the outer peripheral surface of the flame-holding member which is closed towards the radially outward from the outer circumferential surface of the hydrogen gas supply pipe and the inner surface of the air supply pipe as the required An inclined guide portion inclined from the downstream side to the upstream side is provided on the outer peripheral portion on the upstream side in the thickness direction of the flame holding member so as to pass through the space, and air is provided along the inclined guide portion. the air flowing through the supply pipe and is guided to the guide passage of the. In this way, the air flowing in the air supply pipe is appropriately provided in the guide passage between the outer peripheral surface of the flame holding member and the inner peripheral surface of the air supply pipe along the inclined guide portion provided on the flame holding member. The air guided in this way is guided to the tip side of the hydrogen gas supply pipe in a more rectified state through this guide passage, and comes into contact with the hydrogen gas at a position away from the ejection port for ejecting the hydrogen gas. As a result, the generation of NOx becomes more stable and sufficiently suppressed.

また、このように保炎部材の厚み方向上流側の外周部に、空気供給管に向かうように下流側から上流側に傾斜した傾斜案内部を設けるにあたっては、空気供給管内を流れる空気が、保炎部材に設けた前記の傾斜案内部に沿って保炎部材の外周面と空気供給管の内周面との間の案内通路に適切に導かれ、このように導かれた空気がこの案内通路を通してより整流された状態で水素ガス供給管の先端側に導かれるようにするためには、保炎部材に設ける前記の傾斜案内部における水平方向に対する傾斜角θを３０°〜６０°の範囲にすることが好ましい。 Further, in providing the inclined guide portion inclined from the downstream side to the upstream side toward the air supply pipe on the outer peripheral portion on the upstream side in the thickness direction of the flame holding member in this way, the air flowing in the air supply pipe is retained. Along the inclined guide portion provided on the flame member, the air is appropriately guided to a guide passage between the outer peripheral surface of the flame holding member and the inner peripheral surface of the air supply pipe, and the air guided in this way is the guide passage. In order to be guided to the tip side of the hydrogen gas supply pipe in a more rectified state through the flame holding member, the inclination angle θ with respect to the horizontal direction in the inclination guide portion provided in the flame holding member is set in the range of 30 ° to 60 °. It is preferable to do so.

また、本発明における水素ガス燃焼装置において、前記のように水素ガス供給管の外周面から半径方向外方に向かう閉塞された保炎部材を空気供給管の内周面と所要間隔を介するように設けるにあたり、前記の保炎部材の厚み方向上流側の内周部に凹部を形成することが好ましい。このようにすると、空気供給管内を流れる空気が保炎部材の外周面と空気供給管の内周面との間の案内通路を通して適切に整流されるように、案内通路に沿った保炎部材における空気の案内方向の厚みを大きくした場合にも、保炎部材の重量を少なくして、水素ガス供給管の外周面に適切に設けることができるようになる。なお、案内通路に沿った保炎部材における空気の案内方向の厚みは特に限定されないが、保炎部材における前記の厚みを大きくするほど、保炎部材の外周面と空気供給管の内周面との間の案内通路を通して流れる空気の整流性を高めることができる一方、空気の供給性が低下するため、保炎部材の外周面と空気供給管の内周面との間の間隔や空気供給管内を流れる空気の量に対応させて適宜決定することが好ましい。例えば、保炎部材における前記の厚みに対する、保炎部材の外周面と空気供給管の内周面との間の案内通路の間隔との比を０．１０〜０．３０の範囲にすることが好ましい。 Further, in the hydrogen gas combustion device of the present invention, as described above, the closed flame-retaining member extending outward in the radial direction from the outer peripheral surface of the hydrogen gas supply pipe is interposed with the inner peripheral surface of the air supply pipe at the required distance. In providing the flame-retaining member, it is preferable to form a recess on the inner peripheral portion on the upstream side in the thickness direction of the flame-retaining member. In this way, the flame-retaining member along the guide passage so that the air flowing in the air supply pipe is appropriately rectified through the guide passage between the outer peripheral surface of the flame-retaining member and the inner peripheral surface of the air supply pipe. Even when the thickness in the air guiding direction is increased, the weight of the flame holding member can be reduced so that the flame holding member can be appropriately provided on the outer peripheral surface of the hydrogen gas supply pipe. The thickness of the flame-retaining member along the guide passage in the air guiding direction is not particularly limited, but the larger the thickness of the flame-retaining member, the more the outer peripheral surface of the flame-retaining member and the inner peripheral surface of the air supply pipe. While the rectification of the air flowing through the guide passage between the two can be improved, the air supply is reduced, so that the distance between the outer peripheral surface of the flame holding member and the inner peripheral surface of the air supply pipe and the inside of the air supply pipe are reduced. It is preferable to determine appropriately according to the amount of air flowing through. For example, the ratio of the distance between the outer peripheral surface of the flame-retaining member and the inner peripheral surface of the air supply pipe to the thickness of the flame-retaining member may be in the range of 0.10 to 0.30. preferable.

本発明における水素ガス燃焼装置においては、前記のように水素ガスを供給する水素ガス供給管の外周側に燃焼用の空気を供給する空気供給管を設け、前記の水素ガス供給管の先端部に水素ガスを前方に噴出させる噴出口を設けると共に、前記の噴出口よりも上流側の位置に、水素ガス供給管の外周から半径方向に外方に向かい閉塞された保炎部材を空気供給管の内周と所要間隔を介するように設け、前記の保炎部材の外周と空気供給管の内周との間に空気供給管内を流れる空気を水素ガス供給管の先端側に導く案内通路を形成し、前記の保炎部材の厚み方向上流側の外周部に、空気供給管に向かうように下流側から上流側に傾斜した傾斜案内部を設け、この傾斜案内部に沿って空気供給管内を流れる空気を前記の案内通路に導くようにしたため、空気供給管内を流れる燃焼用の空気が、前記の保炎部材の外周面と空気供給管の内周面との間の案内通路を通して整流された状態で水素ガス供給管の先端側に導かれ、水素ガス供給管の先端部における噴出口から前方に噴出される水素ガスから離れた空気供給管の内周面から徐々に前記の水素ガスと接触して燃焼されるようになる。 In the hydrogen gas combustion apparatus of the present invention, an air supply pipe for supplying combustion air is provided on the outer peripheral side of the hydrogen gas supply pipe for supplying hydrogen gas as described above, and an air supply pipe for supplying combustion air is provided at the tip of the hydrogen gas supply pipe. An outlet for ejecting hydrogen gas forward is provided, and a flame-retaining member that is closed radially outward from the outer periphery of the hydrogen gas supply pipe is provided at a position upstream of the outlet of the air supply pipe. A guide passage is formed between the outer circumference of the flame-retaining member and the inner circumference of the air supply pipe to guide the air flowing in the air supply pipe to the tip end side of the hydrogen gas supply pipe. , An inclined guide portion inclined from the downstream side to the upstream side is provided on the outer peripheral portion on the upstream side in the thickness direction of the flame-retaining member so as to face the air supply pipe, and the air flowing in the air supply pipe along the inclined guide portion. Is guided to the guide passage, so that the combustion air flowing in the air supply pipe is rectified through the guide passage between the outer peripheral surface of the flame holding member and the inner peripheral surface of the air supply pipe. It is guided to the tip side of the hydrogen gas supply pipe and gradually comes into contact with the hydrogen gas from the inner peripheral surface of the air supply pipe away from the hydrogen gas ejected forward from the ejection port at the tip of the hydrogen gas supply pipe. Will be burned.

この結果、本発明における水素ガス燃焼装置においては、前記のように水素ガス供給管の先端部における噴出口から前方に噴出される水素ガスが、保炎部材の外周面と空気供給管の内周面との間の案内通路を通して空気供給管の内周面に沿って導かれた空気と徐々に接触して燃焼され、水素ガスの燃焼速度が速くなるのが抑制されて、局所的に温度が上昇するのが防止されると共に、最高火炎温度が高くなるのも抑制され、ＮＯｘの発生量が多くなるのが防止されるようになる。 As a result, in the hydrogen gas combustion device of the present invention, as described above, the hydrogen gas ejected forward from the ejection port at the tip of the hydrogen gas supply pipe is the outer peripheral surface of the flame holding member and the inner circumference of the air supply pipe. It gradually comes into contact with the air guided along the inner peripheral surface of the air supply pipe through the guide passage between the surfaces and is burned, suppressing the increase in the combustion speed of hydrogen gas and locally increasing the temperature. In addition to being prevented from rising, the increase in the maximum flame temperature is also suppressed, and the amount of NOx generated is prevented from increasing.

本発明の一実施形態において、水素ガス供給管の先端部に設けた水素ガスを前方に噴出させる噴出口よりも上流側の位置に、水素ガス供給管の外周面から半径方向外方に向かう閉塞された保炎部材を空気供給管の内周面と所要間隔を介するように設けるにあたり、保炎部材の厚み方向上流側の内周部に凹部を形成すると共に、厚み方向上流側の外周部に空気供給管に向かうように下流側から上流側に傾斜した傾斜案内部を設けた保炎部材を用いた水素ガス燃焼装置を炉壁に取り付けて使用する状態を示した概略断面説明図である。In one embodiment of the present invention, a blockage provided at the tip of the hydrogen gas supply pipe is located upstream of an outlet for ejecting hydrogen gas forward, from the outer peripheral surface of the hydrogen gas supply pipe outward in the radial direction. When the flame-retaining member is provided so as to pass through the inner peripheral surface of the air supply pipe and the required interval, a recess is formed in the inner peripheral portion on the upstream side in the thickness direction of the flame-retaining member, and the outer peripheral portion on the upstream side in the thickness direction is formed. It is a schematic cross-sectional explanatory view which showed the state which attached to the furnace wall, and used the hydrogen gas combustion apparatus which used the flame-retaining member provided with the inclined guide part inclined from the downstream side to the upstream side toward the air supply pipe. 前記の図１に示した水素ガス燃焼装置において、（Ａ）は水素ガス及び空気の流れを示した概略部分断面説明図、（Ｂ）は水素ガス燃焼装置の概略部分断面説明図である。In the hydrogen gas combustion apparatus shown in FIG. 1, (A) is a schematic partial cross-sectional explanatory view showing the flow of hydrogen gas and air, and (B) is a schematic partial cross-sectional explanatory view of the hydrogen gas combustion apparatus. 前記の実施形態における水素ガス燃焼装置において、水素ガス供給管の外周面から半径方向外方に向かう閉塞された保炎部材を変更させた第１の変更例として、保炎部材の厚み方向上流側の内周部に凹部を形成せずに、厚み方向上流側の外周部に空気供給管に向かうように下流側から上流側に傾斜した傾斜案内部を設けた保炎部材を用いた場合を示し、（Ａ）は水素ガス及び空気の流れを示した概略部分断面説明図、（Ｂ）は水素ガス燃焼装置の概略部分断面説明図である。In the hydrogen gas combustion apparatus according to the above embodiment, as a first modification example in which the closed flame-retaining member is changed from the outer peripheral surface of the hydrogen gas supply pipe in the radial direction outward, the upstream side in the thickness direction of the flame-retaining member. The case where a flame-retaining member having an inclined guide portion inclined from the downstream side to the upstream side so as to face the air supply pipe is used on the outer peripheral portion on the upstream side in the thickness direction without forming a concave portion on the inner peripheral portion of the above. , (A) is a schematic partial cross-sectional explanatory view showing the flow of hydrogen gas and air, and (B) is a schematic partial cross-sectional explanatory view of the hydrogen gas combustion apparatus. 本発明の参考形態における水素ガス燃焼装置において、水素ガス供給管の外周面から半径方向外方に向かう閉塞された保炎部材を変更させた第２の変更例として、一定した厚みになった保炎部材を用いた場合を示し、（Ａ）は水素ガス及び空気の流れを示した概略部分断面説明図、（Ｂ）は水素ガス燃焼装置の概略部分断面説明図である。 In the hydrogen gas combustion apparatus according to the reference embodiment of the present invention, as a second modification example in which the closed flame holding member is changed from the outer peripheral surface of the hydrogen gas supply pipe toward the outer side in the radial direction, the thickness is kept constant. A case where a flame member is used is shown, (A) is a schematic partial cross-sectional explanatory view showing the flow of hydrogen gas and air, and (B) is a schematic partial cross-sectional explanatory view of a hydrogen gas combustion apparatus.

本発明の実施形態に係る水素ガス燃焼装置を、添付図面に基づいて具体的に説明する。なお、本発明に係る水素ガス燃焼装置は、下記の実施形態に示したものに限定されず、発明の要旨を変更しない範囲において、適宜変更して実施できるものである。 The hydrogen gas combustion apparatus according to the embodiment of the present invention will be specifically described with reference to the accompanying drawings. The hydrogen gas combustion apparatus according to the present invention is not limited to the one shown in the following embodiment, and can be appropriately modified and implemented without changing the gist of the invention.

先ず、図１及び図２に示す実施形態における水素ガス燃焼装置においては、水素ガスＧｈを供給する水素ガス供給管１０の外周側に、燃焼用の空気Ａｉを供給する空気供給管２０を設け、前記の水素ガス供給管１０の先端部に水素ガスＧｈを前方に噴出させる噴出口１１を設ける一方、この噴出口１１より水素ガスＧｈの流れ方向上流側の位置に、水素ガス供給管１０の外周面から半径方向外方に向かう閉塞された（すなわち、特許文献３に示す保炎板のような小孔がない。）保炎部材３０を空気供給管２０の内周面と所要間隔を介するように設け、この保炎部材３０の外周面と空気供給管２０の内周面との間に、空気供給管２０内を流れる空気を水素ガス供給管１０の先端側に導く案内通路Ｓを形成させるようにし、また前記の空気供給管２０の先端部における燃焼管部２１を、炉壁１を貫通させるようにして設けている。 First, in the hydrogen gas combustion apparatus according to the embodiment shown in FIGS. 1 and 2, an air supply pipe 20 for supplying combustion air Ai is provided on the outer peripheral side of the hydrogen gas supply pipe 10 for supplying hydrogen gas Gh. A spout 11 for ejecting hydrogen gas Gh forward is provided at the tip of the hydrogen gas supply pipe 10, while the outer periphery of the hydrogen gas supply pipe 10 is located upstream of the spout 11 in the flow direction of the hydrogen gas Gh. The flame-retaining member 30 is closed (that is, there is no small hole like the flame-retaining plate shown in Patent Document 3) from the surface outward in the radial direction so as to pass through the inner peripheral surface of the air supply pipe 20 and the required distance. A guide passage S for guiding the air flowing in the air supply pipe 20 to the tip end side of the hydrogen gas supply pipe 10 is formed between the outer peripheral surface of the flame holding member 30 and the inner peripheral surface of the air supply pipe 20. In addition, the combustion pipe portion 21 at the tip of the air supply pipe 20 is provided so as to penetrate the furnace wall 1.

そして、前記の水素ガス燃焼装置においては、前記の保炎部材３０として、水素ガス供給管１０の先端側に外周面から半径方向外方に延出されて空気供給管２０の内周面と所要間隔を介するようにして円板状になった前面板部３１が設けられ、この前面板部３１の外周縁から空気Ａｉの流れ方向上流側の厚み方向に延出されて内周部に凹部３２が形成されたリング状になった案内部３３が設けられ、この案内部３３における上流側の外周部に、下流側から上流側に向けて外周側の空気供給管２０に向かうように傾斜した傾斜案内部３３ａを設けたものを用いている。 Then, in the hydrogen gas combustion device, as the flame holding member 30, the flame holding member 30 extends outward in the radial direction from the outer peripheral surface to the tip end side of the hydrogen gas supply pipe 10, and is required to be the inner peripheral surface of the air supply pipe 20. A disc-shaped front plate portion 31 is provided so as to pass through an interval, and extends from the outer peripheral edge of the front plate portion 31 in the thickness direction on the upstream side in the flow direction of air Ai, and a recess 32 is formed in the inner peripheral portion. A ring-shaped guide portion 33 is provided, and the outer peripheral portion on the upstream side of the guide portion 33 is inclined so as to be directed toward the air supply pipe 20 on the outer peripheral side from the downstream side to the upstream side. The one provided with the guide portion 33a is used.

そして、この実施形態の水素ガス燃焼装置のように、水素ガス供給管１０の先端部における噴出口１１より水素ガスＧｈの流れ方向上流側の位置に、前記のような保炎部材３０を設けると、空気供給管２０内を流れる空気Ａｉが保炎部材３０により抑止される一方、前記の空気Ａｉがこの保炎部材３０における案内部３３の上流側の外周部に設けた前記の傾斜案内部３３ａに沿って案内部３３に導かれ、この空気Ａｉが保炎部材３０の外周面における案内部３３と空気供給管２０の内周面との間の案内通路Ｓを通して整流されて、圧力損失の少ない状態で水素ガス供給管１０の先端側に導かれようになり、前記の水素ガス供給管１０の先端部における噴出口１１から前方に広がりながら噴出された水素ガスＧｈと徐々に接触して、前記の水素ガスＧｈが広い範囲で燃焼されるようになる。 Then, as in the hydrogen gas combustion apparatus of this embodiment, the flame holding member 30 as described above is provided at a position upstream of the ejection port 11 at the tip of the hydrogen gas supply pipe 10 in the flow direction of the hydrogen gas Gh. The air Ai flowing in the air supply pipe 20 is suppressed by the flame-retaining member 30, while the inclined guide portion 33a provided on the outer peripheral portion of the flame-retaining member 30 on the upstream side of the guide portion 33. The air Ai is guided to the guide portion 33 along the guide passage S between the guide portion 33 and the inner peripheral surface of the air supply pipe 20 on the outer peripheral surface of the flame holding member 30, and the pressure loss is small. In this state, the gas is guided to the tip side of the hydrogen gas supply pipe 10, and gradually comes into contact with the hydrogen gas Gh ejected while spreading forward from the ejection port 11 at the tip of the hydrogen gas supply pipe 10, and the said Hydrogen gas Gh will be burned in a wide range.

この結果、前記の水素ガス燃焼装置においては、水素ガスＧｈの燃焼速度が速くなるのが抑制されて、局所的に温度が上昇するのが防止されると共に、最高火炎温度が高くなるのが抑制されて、ＮＯｘの発生量が多くなるのを抑制できるようになる。 As a result, in the hydrogen gas combustion apparatus, the increase in the combustion rate of the hydrogen gas Gh is suppressed, the temperature is prevented from rising locally, and the maximum flame temperature is suppressed from rising. Therefore, it becomes possible to suppress an increase in the amount of NOx generated.

ここで、この実施形態の水素ガス燃焼装置において、前記の保炎部材３０を設けるにあたっては、空気供給管２０の内径Ｄ20（約１０５ｍｍ）に対する保炎部材３０における案内部３３の外径Ｄ30（約９６ｍｍ）の比（Ｄ30／Ｄ20）を０．９程度にすると共に、保炎部材３０における前面板部３１の外周縁から空気Ａｉの流れ方向上流側の厚み方向に延出された案内部３３の長さＬａ、すなわち保炎部材３０における空気Ａｉの流れ方向上流側の厚みＬａ（約２０ｍｍ）に対する、空気供給管２０の内周面と保炎部材３０の外周面との間における案内通路Ｓの間隔Ｓａ（約５ｍｍ）との比を０．２５にすると共に、保炎部材３０の前記の傾斜案内部３３ａにおける水平方向に対する傾斜角θを約３０°になるようにしている。 Here, in the hydrogen gas combustion apparatus of this embodiment, when the flame holding member 30 is provided, the outer diameter D 30 of the guide portion 33 in the flame holding member 30 with respect to the inner diameter D 20 (about 105 mm) of the air supply pipe 20. The ratio (D 30 / D 20 ) of (about 96 mm) was set to about 0.9, and the flame-retaining member 30 was extended from the outer peripheral edge of the front plate portion 31 in the thickness direction on the upstream side in the flow direction of air Ai. Between the inner peripheral surface of the air supply pipe 20 and the outer peripheral surface of the flame retaining member 30 with respect to the length La of the guide portion 33, that is, the thickness La (about 20 mm) on the upstream side of the air Ai in the flame retaining member 30 in the flow direction. The ratio of the guide passage S to the distance Sa (about 5 mm) is set to 0.25, and the inclination angle θ of the flame holding member 30 in the inclined guide portion 33a in the horizontal direction is set to about 30 °.

このようにすると、空気供給管２０内を流れる空気Ａｉが、保炎部材３０に設けた前記の傾斜案内部３３ａに沿って保炎部材３０の外周面と空気供給管２０の内周面との間の案内通路Ｓに適切に導かれ、このように導かれた空気Ａｉがこの案内通路Ｓを通してより整流された状態で水素ガス供給管１０の先端側に導かれるようになり、保炎部材３０を通過した空気Ａｉが徐々に広がりながら、前記の水素ガス供給管１０の先端部における噴出口１１から前方に広がりながら噴出された水素ガスＧｈと徐々に接触して、前記の水素ガスＧｈが広い範囲で燃焼されるようになる。 In this way, the air Ai flowing in the air supply pipe 20 is formed between the outer peripheral surface of the flame holding member 30 and the inner peripheral surface of the air supply pipe 20 along the inclined guide portion 33a provided on the flame holding member 30. It is appropriately guided to the guide passage S between them, and the air Ai thus guided is guided to the tip side of the hydrogen gas supply pipe 10 in a more rectified state through the guide passage S, and the flame holding member 30 The air Ai that has passed through the above-mentioned hydrogen gas supply pipe 10 gradually spreads and gradually comes into contact with the hydrogen gas Gh ejected while spreading forward from the ejection port 11 at the tip of the hydrogen gas supply pipe 10, and the said hydrogen gas Gh becomes wide. It will be burned in the range.

ここで、前記の水素ガス燃焼装置においては、保炎部材３０として、前記のように水素ガス供給管１０の先端側に外周面から半径方向外方に延出されて空気供給管２０の内周面と所要間隔を介するようにして円板状になった前面板部３１が設けられ、この前面板部３１の外周縁から空気Ａｉの流れ方向上流側の厚み方向に延出されて内周部に凹部３２が形成されたリング状になった案内部３３が設けられ、この案内部３３における上流側の外周部に、下流側から上流側に向けて外周側の空気供給管２０に向かうように傾斜した傾斜案内部３３ａを設けたものを用いるようにしたが、使用する保炎部材３０はこのようなものに限定されない。 Here, in the hydrogen gas combustion device, as the flame holding member 30, the inner circumference of the air supply pipe 20 extends outward in the radial direction from the outer peripheral surface to the tip end side of the hydrogen gas supply pipe 10 as described above. A disc-shaped front plate portion 31 is provided so as to pass through a surface and a required interval, and extends from the outer peripheral edge of the front plate portion 31 in the thickness direction on the upstream side in the flow direction of air Ai to the inner peripheral portion. A ring-shaped guide portion 33 having a recess 32 formed therein is provided, and the outer peripheral portion on the upstream side of the guide portion 33 is directed from the downstream side to the upstream side toward the air supply pipe 20 on the outer peripheral side. Although the one provided with the inclined guide portion 33a is used, the flame holding member 30 to be used is not limited to such a member.

例えば、保炎部材３０Ａとして、図３（Ａ），（Ｂ）に示すように、前記の保炎部材３０において、円板状になった前面板部３１の外周縁から空気Ａｉの流れ方向上流側の厚み方向に延出された案内部３３の内周部に凹部３２を設けないようにし、それ以外は、前記の保炎部材３０と同様に、案内部３３における上流側の外周部に、下流側から上流側に向けて外周側の空気供給管２０に向かうように傾斜した傾斜案内部３３ａを設けたものを用いることができる。 For example, as the flame-retaining member 30A, as shown in FIGS. 3A and 3B, in the flame-retaining member 30, the air Ai flows upstream from the outer peripheral edge of the disk-shaped front plate portion 31. A recess 32 is not provided in the inner peripheral portion of the guide portion 33 extending in the thickness direction on the side, and other than that, the outer peripheral portion on the upstream side of the guide portion 33 is formed in the same manner as the flame holding member 30. It is possible to use one provided with an inclined guide portion 33a inclined so as to face the air supply pipe 20 on the outer peripheral side from the downstream side to the upstream side.

そして、このような保炎部材３０Ａを用いた場合においても、前記の実施形態における保炎部材３０の場合と同様に、図３（Ａ）に示すように、空気供給管２０内を流れる空気Ａｉが、保炎部材３０に設けた前記の傾斜案内部３３ａに沿って保炎部材３０の外周面と空気供給管２０の内周面との間の案内通路Ｓに適切に導かれ、このように導かれた空気Ａｉがこの案内通路Ｓを通してより整流された状態で水素ガス供給管１０の先端側に導かれ、保炎部材３０を通過した空気Ａｉが徐々に広がりながら、前記の水素ガス供給管１０の先端部における噴出口１１から前方に広がりながら噴出された水素ガスＧｈと徐々に接触して、前記の水素ガスＧｈが広い範囲で燃焼されるようになる。但し、この保炎部材３０Ａにおいては、前記の保炎部材３０のように案内部３３の内周部に凹部３２が設けられていないため、保炎部材３０Ａの材料コストが高くつくと共に、保炎部材３０Ａ自体の重量が重くなって取り扱いが困難になり、水素ガス供給管１０の外周に取り付けたりする作業が困難になる。 Even when such a flame-retaining member 30A is used, the air Ai flowing in the air supply pipe 20 is as shown in FIG. 3A, as in the case of the flame-retaining member 30 in the above-described embodiment. Is appropriately guided to the guide passage S between the outer peripheral surface of the flame holding member 30 and the inner peripheral surface of the air supply pipe 20 along the inclined guide portion 33a provided on the flame holding member 30. The guided air Ai is guided to the tip side of the hydrogen gas supply pipe 10 in a more rectified state through the guide passage S, and the air Ai that has passed through the flame holding member 30 gradually spreads while the hydrogen gas supply pipe. The hydrogen gas Gh gradually comes into contact with the hydrogen gas Gh ejected while spreading forward from the ejection port 11 at the tip of the ten, and the hydrogen gas Gh is burned in a wide range. However, unlike the flame-retaining member 30, the flame-retaining member 30A is not provided with a recess 32 in the inner peripheral portion of the guide portion 33, so that the material cost of the flame-retaining member 30A is high and the flame-retaining member 30A is flame-retaining. The weight of the member 30A itself becomes heavy, which makes it difficult to handle, and makes it difficult to attach the member 30A to the outer periphery of the hydrogen gas supply pipe 10.

また、保炎部材３０Ｂとして、図４（Ａ），（Ｂ）に示す参考形態においては、前記の保炎部材３０Ａと同様に、円板状になった前面板部３１の外周縁から空気Ａｉの流れ方向上流側の厚み方向に延出された案内部３３の内周部に凹部３２を設けないようにし、さらに、案内部３３における上流側の外周部に、下流側から上流側に向けて外周側の空気供給管２０に向かうように傾斜した傾斜案内部３３ａを設けないようにし，一定した厚みになったものを用いるようにした。 Further, as the flame holding member 30B, in the reference form shown in FIGS. 4A and 4B, air Ai is formed from the outer peripheral edge of the disk-shaped front plate portion 31 as in the case of the flame holding member 30A. The recess 32 is not provided in the inner peripheral portion of the guide portion 33 extending in the thickness direction on the upstream side in the flow direction of the guide portion 33, and further, the outer peripheral portion on the upstream side of the guide portion 33 is directed from the downstream side to the upstream side. not be provided with inclined inclined guide portion 33a to face the outer peripheral side of the air supply pipe 20, and to use those became constant thickness.

そして、このような保炎部材３０Ｂを用いた場合、案内部３３における上流側の外周部に、下流側から上流側に向けて外周側の空気供給管２０に向かうように傾斜した傾斜案内部３３ａを設けていないため、図４（Ａ）に示すように、空気供給管２０内を流れる空気Ａｉが、傾斜案内部３３ａに沿って案内通路Ｓに導かれずに、案内通路Ｓに導かれる空気Ａｉに負荷が加わって圧力損失が生じるようになる。そして、このように圧力損失が生じた状態で、空気Ａｉが案内通路Ｓを通して水素ガス供給管１０の先端側に導かれ、水素ガス供給管１０の先端側に導かれた空気Ａｉの広がりが、前記の保炎部材３０や保炎部材３０Ａを用いた場合に比べて大きくなる。このため、案内通路Ｓを通して水素ガス供給管１０の先端側に導かれた空気Ａｉが、水素ガス供給管１０の先端部における噴出口１１から前方に広がりながら噴出された水素ガスＧｈと接触して燃焼するタイミングが前記の保炎部材３０や保炎部材３０Ａを用いた場合に比べて早くなる。すなわち、保炎部材３０や保炎部材３０Ａを用いたときよりも、水素ガスＧｈを噴出させる噴出口１１から近い位置で空気Ａｉと水素ガスＧｈが接触して燃焼が行われるようになる。 When such a flame holding member 30B is used, the inclined guide portion 33a is inclined so as to be directed toward the air supply pipe 20 on the outer peripheral side from the downstream side to the upstream side on the outer peripheral portion on the upstream side of the guide portion 33. As shown in FIG. 4 (A), the air Ai flowing in the air supply pipe 20 is not guided to the guide passage S along the inclined guide portion 33a, but is guided to the guide passage S. A load is applied to the air, causing a pressure loss. Then, in the state where the pressure loss occurs in this way, the air Ai is guided to the tip side of the hydrogen gas supply pipe 10 through the guide passage S, and the spread of the air Ai guided to the tip side of the hydrogen gas supply pipe 10 is increased. It becomes larger than the case where the flame-retaining member 30 and the flame-retaining member 30A are used. Therefore, the air Ai guided to the tip end side of the hydrogen gas supply pipe 10 through the guide passage S comes into contact with the hydrogen gas Gh ejected while spreading forward from the ejection port 11 at the tip end portion of the hydrogen gas supply pipe 10. The timing of combustion is earlier than when the flame-retaining member 30 or the flame-retaining member 30A is used. That is, the air Ai and the hydrogen gas Gh come into contact with each other at a position closer to the ejection port 11 for ejecting the hydrogen gas Gh than when the flame holding member 30 or the flame holding member 30A is used, and combustion is performed.

しかし、このような保炎部材３０Ｂを用いた場合においても、保炎板における小孔を設けた従来のものに比べると、前記の水素ガスＧｈが広い範囲で燃焼されるようになり、水素ガスＧｈの燃焼速度が速くなるのが抑制されて、局所的に温度が上昇するのが抑制されると共に、最高火炎温度が高くなるのも抑制されて、ＮＯｘの発生が抑制されるようになる。 However, even when such a flame-retaining member 30B is used, the hydrogen gas Gh is burned in a wider range as compared with the conventional one having small holes in the flame-retaining plate, and the hydrogen gas The increase in the combustion rate of Gh is suppressed, the local temperature rise is suppressed, and the increase in the maximum flame temperature is also suppressed, so that the generation of NOx is suppressed.

なお、各保炎部材３０、３０Ａ、３０Ｂにおける案内部３３の厚みＬａは特に限定されないが、保炎部材３０、３０Ａ、３０Ｂにおける案内部３３の厚みＬａが小さくなると、保炎部材３０、３０Ａ、３０Ｂの案内部３３を通過する空気Ａｉの整流性が悪くなり、保炎部材３０、３０Ａ、３０Ｂを通過した空気Ａｉが水素ガス供給管１０の先端部における噴出口１１から前方に広がりながら噴出された水素ガスＧｈと早い時期に接触して水素ガスＧｈが燃焼されるようになり、ＮＯｘが発生しやすくなる。一方、保炎部材３０、３０Ａ、３０Ｂにおける案内部３３の厚みＬａを大きくするほど、保炎部材３０、３０Ａ、３０Ｂの外周面と空気供給管２０の内周面との間の案内通路Ｓを通して流れる空気Ａｉの整流性が高められるが、水素ガス供給管１０の先端部に導かれる空気Ａｉの量が低下するおそれがある。このため、保炎部材３０、３０Ａ、３０Ｂにおける案内部３３の厚みＬａは、保炎部材３０、３０Ａ、３０Ｂの外周面と空気供給管２０の内周面との間の案内通路Ｓの間隔Ｓａや、空気供給管２０内を流れる空気Ａｉの量に対応させて適宜決定することが好ましい。 The thickness La of the guide portion 33 in each of the flame holding members 30, 30A, 30B is not particularly limited, but when the thickness La of the guide portion 33 in the flame holding members 30, 30A, 30B becomes smaller, the flame holding members 30, 30A, The rectification property of the air Ai passing through the guide portion 33 of the 30B deteriorates, and the air Ai passing through the flame holding members 30, 30A, and 30B is ejected while spreading forward from the ejection port 11 at the tip of the hydrogen gas supply pipe 10. The hydrogen gas Gh comes into contact with the hydrogen gas Gh at an early stage, and the hydrogen gas Gh is burned, so that NOx is easily generated. On the other hand, as the thickness La of the guide portion 33 in the flame holding members 30, 30A, 30B is increased, the guide passage S between the outer peripheral surface of the flame holding members 30, 30A, 30B and the inner peripheral surface of the air supply pipe 20 is passed. Although the rectification of the flowing air Ai is enhanced, the amount of air Ai guided to the tip of the hydrogen gas supply pipe 10 may decrease. Therefore, the thickness La of the guide portion 33 in the flame holding members 30, 30A, 30B is the distance Sa of the guide passage S between the outer peripheral surface of the flame holding members 30, 30A, 30B and the inner peripheral surface of the air supply pipe 20. It is preferable to determine appropriately according to the amount of air Ai flowing in the air supply pipe 20.

１ ：炉壁
１０ ：水素ガス供給管
１１ ：噴出口
２０ ：空気供給管
２１ ：燃焼管部
３０ ：保炎部材
３０Ａ ：保炎部材
３０Ｂ ：保炎部材
３１ ：前面板部
３２ ：凹部
３３ ：案内部
３３ａ ：傾斜案内部
Ａｉ ：空気
Ｄ20 ：空気供給管の内径
Ｄ30 ：保炎部材の案内部の外径
Ｇｈ ：水素ガス
Ｌａ ：保炎部材の案内部の厚み
Ｓ ：案内通路
Ｓａ ：案内通路の間隔
θ ：傾斜案内部における水平方向に対する傾斜角

1: Furnace wall 10: Hydrogen gas supply pipe 11: Spout 20: Air supply pipe 21: Combustion pipe part 30: Flame-retaining member 30A: Flame-retaining member 30B: Flame-retaining member 31: Front plate part 32: Recess 33: Guide Part 33a: Inclined guide part Ai: Air D 20 : Inner diameter D 30 of air supply pipe: Outer diameter of guide part of flame holding member Gh: Hydrogen gas La: Thickness of guide part of flame holding member S: Guide passage Sa: Guide Path spacing θ: Tilt angle with respect to the horizontal direction at the tilt guide

Claims (3)

水素ガス供給管を通して供給された水素ガスを空気と混合させて燃焼させる水素ガス燃焼装置において、水素ガスを供給する水素ガス供給管の外周側に燃焼用の空気を供給する空気供給管を設け、前記の水素ガス供給管の先端部に水素ガスを前方に噴出させる噴出口を設けると共に、前記の噴出口よりも上流側の位置に、水素ガス供給管の外周面から半径方向外方に向かう閉塞された保炎部材を空気供給管の内周面と所要間隔を介するように設け、前記の保炎部材の外周面と空気供給管の内周面との間に空気供給管内を流れる空気を水素ガス供給管の先端側に導く案内通路を形成し、前記の保炎部材の厚み方向上流側の外周部に、空気供給管に向かうように下流側から上流側に傾斜した傾斜案内部を設け、この傾斜案内部に沿って空気供給管内を流れる空気を前記の案内通路に導くようにしたことを特徴とする水素ガス燃焼装置。 In a hydrogen gas combustion device that mixes hydrogen gas supplied through a hydrogen gas supply pipe with air and burns it, an air supply pipe that supplies combustion air is provided on the outer peripheral side of the hydrogen gas supply pipe that supplies hydrogen gas. A spout for ejecting hydrogen gas forward is provided at the tip of the hydrogen gas supply pipe, and a blockage is provided at a position upstream of the spout in the radial direction from the outer peripheral surface of the hydrogen gas supply pipe. The flame-retaining member is provided so as to pass through the inner peripheral surface of the air supply pipe and the required interval, and the air flowing in the air supply pipe is hydrogenated between the outer peripheral surface of the flame-retaining member and the inner peripheral surface of the air supply pipe. A guide passage leading to the tip side of the gas supply pipe is formed , and an inclined guide portion inclined from the downstream side to the upstream side is provided on the outer peripheral portion on the upstream side in the thickness direction of the flame-retaining member so as to face the air supply pipe. A hydrogen gas combustion apparatus characterized in that air flowing in an air supply pipe along the inclined guide portion is guided to the guide passage. 請求項１に記載の水素ガス燃焼装置において、水素ガス供給管の外周面から半径方向外方に向かう閉塞された保炎部材の外周面と空気供給管の内周面とが所要間隔を介するように設けるにあたり、前記の空気供給管の内径に対する保炎部材の外径の比が０．９０〜０．９５の範囲であることを特徴とする水素ガス燃焼装置。 In the hydrogen gas combustion apparatus according to claim 1, the outer peripheral surface of the closed flame-retaining member extending outward in the radial direction from the outer peripheral surface of the hydrogen gas supply pipe and the inner peripheral surface of the air supply pipe are interposed at a required interval. A hydrogen gas combustion apparatus characterized in that the ratio of the outer diameter of the flame-retaining member to the inner diameter of the air supply pipe is in the range of 0.90 to 0.95. 請求項１又は請求項２に記載の水素ガス燃焼装置において、前記の保炎部材の厚み方向上流側の内周部に凹部を形成したことを特徴とする水素ガス燃焼装置。 The hydrogen gas combustion apparatus according to claim 1 or 2 , wherein a recess is formed in an inner peripheral portion on the upstream side in the thickness direction of the flame holding member.
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