JP3815853B2

JP3815853B2 - Concentration burner

Info

Publication number: JP3815853B2
Application number: JP16419597A
Authority: JP
Inventors: 哲二大塚; 哲司森田; 愛隆谷村
Original assignee: Osaka Gas Co Ltd
Current assignee: Osaka Gas Co Ltd
Priority date: 1997-06-20
Filing date: 1997-06-20
Publication date: 2006-08-30
Anticipated expiration: 2017-06-20
Also published as: JPH1114014A

Description

【０００１】
【発明の属する技術分野】
本発明は、細長い炎口面を一端側に備え、その炎口面に燃料ガスと燃焼用空気との濃混合気を噴出して燃焼させる複数個の濃炎口部を備えた複数の濃用バ−ナを前記炎口面の幅方向に間隔を隔てて並設し、前記炎口面どうしの間に燃料ガスと燃焼用空気との淡混合気を噴出して燃焼させる淡炎口部を設けて、前記濃用バ−ナの炎口面と前記淡炎口部とを隣接してある濃淡燃焼装置に関する。
【０００２】
【従来の技術】
従来の濃淡燃焼装置では、一般に濃用バ−ナの炎口面を形成する炎口板の横断面形状を、上面が閉鎖するコの字形に形成し、その平坦な上面の横方向の中間部にスリット状の炎孔を形成していた。
【０００３】
【発明が解決しようとする課題】
通常、濃淡燃焼装置では、淡混合気に対する濃混合気の比率が小さくなると、装置全体として窒素酸化物であるＮＯｘの発生値が低くなる。従って、ＮＯｘの発生値を低くするためには、濃用バ−ナの間隔を広くして、淡炎口部を炎口面の幅方向に広げ、淡混合気に対する濃混合気の比率を小さくすることが考えられるが、その場合には、淡混合気の噴出幅が広くなりすぎて、淡混合気が十分に燃焼できないという問題が起こる。
【０００４】
本発明は、かかる問題に着目してなされたものであり、その目的は濃火炎によって淡火炎を良好に保炎しながら、しかも、淡混合気に対する濃混合気の比率を小さくして、ＮＯｘの発生を極力低減させることにある。
【０００５】
【課題を解決するための手段】
請求項１に記載の発明によれば、濃混合気を噴出する複数個の濃炎口部を備えた濃用バ−ナにおいて、濃用バ−ナの炎口面の全体を形成する炎口板を、横断面形状が濃混合気の噴出方向に膨出する膨出形状に形成し、かつ、濃炎口部を炎口板の全幅にわたって炎口面の幅方向に沿うスリット状の炎孔で構成し、そのスリット状の炎孔を前記膨出形状の炎口板の全幅にわたって形成してあり、前記淡炎口部には、前記濃用バーナの炎口面の長手方向に沿う整流板を、その上端が前記濃炎口部の前記スリット状の炎孔の開口下端とほぼ同じ高さになるように設けてある。
つまり、炎口板の横断面形状が、濃混合気の噴出方向に膨出する膨出形状に形成され、その炎口板の全幅にわたって炎口面の幅方向に沿うスリット状の炎孔が形成されているので、濃混合気により生成される濃火炎が、炎口板の幅方向に広がった形状になる。従って、炎口板の幅方向に隣接する淡炎口部から噴出される淡混合気との接触がよくなり、濃火炎が淡火炎に対する保炎をより効果的にできる。
このようにして、濃火炎による淡混合気に対する保炎効果を良好にすることにより、淡混合気を噴出する淡炎口部を炎口板の幅方向に適宜広げても、淡混合気を十分に燃焼させることができ、淡混合気に対する濃混合気の比率を小さくすることができる。
【０００６】
従って、濃火炎による淡混合気に対する保炎をしながら、淡混合気に対する濃混合気の比率を小さくし、ＮＯｘの発生を低減することができる。
【０００７】
請求項２に記載の発明によれば、炎口板の横断面形状をほぼ半円形に形成し、かつ、前記濃炎口部を複数個のほぼ半円形のスリット状の炎孔で構成してある。
つまり、炎口板の横断面形状をほぼ半円形に構成することにより、淡混合気が炎口板の半円に沿って、濃炎口部方向に流入しやすくなる。そして、その濃炎口部を複数個のほぼ半円形のスリット状の炎孔で構成することにより、そのスリット状の炎孔に生成される複数の濃火炎と淡混合気との接触が良好になり、淡混合気を十分に燃焼させることができる。
【０００８】
従って、炎口板の横断面形状をほぼ半円形に構成し、かつ、前記濃炎口部を複数個のほぼ半円形のスリット状の炎孔で構成することにより、濃火炎による淡火炎に対する保炎をより一層効果的にすることができる。
【０００９】
請求項３に記載の発明によれば、前記濃炎口部を炎口面の長手方向に沿ってほぼ全長にわたって配設し、かつ、前記炎口面の最端に位置する濃炎口部より外側に、平面視においてほぼＵ字形のスリット状の炎孔を設けてある。
つまり、濃炎口部を炎口面の長手方向に沿ってほぼ全長にわたって配設することにより、炎口面の長手方向においても、濃火炎による淡火炎に対する保炎をすることができる。しかも、炎口面の最端に位置する濃炎口部より外側に、平面視Ｕ字状の炎孔を設けることで、炎口面の最端に位置する濃炎口部より外側に、外側に向かう濃火炎を生成することができ、外側への淡混合気が流出するのを防ぐことができ、不完全燃焼等を防ぐことができる。
【００１０】
従って、例えば、炎口面の長手方向の両端部よりも外側に、濃淡燃焼装置の結露等を防ぐためのエアーカーテン部が設けられている濃淡燃焼装置においては、このエアーカーテン部に淡混合気が流出するのを防ぎ、濃淡燃焼装置の結露等を防ぎながら、不完全燃焼等の問題が起こることを防止することができる。
【００１１】
請求項４に記載の発明によれば、前記濃用バ−ナの横側方に前記濃炎口部への淡混合気の流入を抑制する遮蔽部材を設けてある。
つまり、前記炎口面の幅方向において、隣接する淡炎口部から噴出される淡混合気が、前記濃炎口部に高速で流入して濃火炎をリフトするのが抑制されるので、濃火炎との接触を良好にしながら、淡混合気による濃火炎のリフト現象を抑制し、安定した燃焼をすることができる。
【００１２】
請求項５に記載の発明によれば、前記遮蔽部材を板状の遮蔽板で構成し、その遮蔽板を前記炎口面の長手方向に沿って、前記濃用バ−ナの両横側方の全長にわたって位置させ、かつ、前記遮蔽板の淡混合気噴出方向の端部を前記濃炎口部の基部よりも濃混合気の噴出噴出方向下手側に位置させてある構成としている。
つまり、前記遮蔽部材を板状の遮蔽板で構成するものであるから、遮蔽部材を板金などによって比較的簡単に作ることができ、前記炎口面の長手方向に沿ってほぼ全長にわたって設けることにより、濃火炎に対する淡混合気の流入抑制を確実にでき、より安定した燃焼をすることができる。
【００１３】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づいて説明する。
先ず、濃淡燃焼装置は、図１と図２に示すように、バーナケース１やバーナケース１内に内装の箱状枠体２などを備え、上面の横断面がほぼ半円形の形状をした板金製の濃用バ−ナ３が、箱状枠体２内に所定の間隔を隔てて複数並設されて収納されている。
前記バーナケース１の下方には、燃焼用空気を供給するファン４が設けられ、その吐出口がバーナケース１の底部と箱状枠体２の底部との間に形成の空気室５に連通されている。
【００１４】
前記濃用バ−ナ３は、空気混合率の小さい濃混合気を噴出して燃焼させるためのもので、図３にも示すように、その上面の細長い炎口面６を形成する炎口板７の横断面形状がほぼ半円形に形成され、濃混合気の噴出方向に膨出している。そして、この炎口面６には、濃混合気を噴出するための複数の濃炎口部８と濃混合気を噴出しない複数の無炎口部９とが、炎口面６の長手方向に沿って交互に配設されている。
各濃炎口部８は、図３、図４に示すように、ほぼ半円形に膨出した炎口板７に沿って、その炎口板７の全幅にわたって、平面視において炎口面６の幅方向に直線状の濃混合気を噴出するスリット状の炎孔８ａの３つで構成され、この濃炎口部８が炎口面６の長手方向に沿ってほぼ全長にわたって配設され、炎口面６の長手方向の最端に位置する濃炎口部８より外側に、淡混合気の流出を防ぐための平面視においてほぼＵ字形のスリット状の炎孔８ｂを設けている。
前記濃用バ−ナ３には、各濃炎口部８に連通する濃用混合室１０と、この濃用混合室１０に燃料ガスと燃焼用空気とを導入する濃用導入口１１が設けられている。
【００１５】
このような構成の濃用バ−ナ３を図１、図２に示すように、炎口面６の幅方向に間隔を隔てて並設し、隣接する濃用バ−ナ３どうしの間には、空気混合率の大きい淡混合気を噴出する細長い淡炎口部１５を備えた淡用混合室１６が形成され、さらに、淡用混合室１６に燃料ガスと燃焼用空気との混合気を供給する淡用ガス導通路１２と、この淡用ガス導通路１２に燃料ガスと燃焼用空気とを導入する淡用導入口１３も設けられ、淡用ガス導通路１２には多数の噴出孔１４が穿設されている。
そして、その淡用混合室１６に淡用ガス導通路１２の噴出孔１４を介して淡用混合気を供給し、かつ、箱状枠体２の底壁を形成する整風用の多孔板１７を介して前記空気室５から上方に向けて燃焼用空気を供給し得るように構成されている。
【００１６】
各濃用バ−ナ３に設けられた濃用導入口１１と淡用導入口１３とは、全て同一方向に向けて並設され、その前面に濃用燃料ガスと淡用燃料ガスとを分配供給するガスヘッダ１８が設けられ、そのガスヘッダ１８に取り付けられた濃用ガスノズル１９が、各濃用導入口１１に、淡用ガスノズル２０が、各淡用導入口１３にそれぞれ臨んでいて、各ガスノズル１９，２０からの燃料ガスの吹き込みによるエゼクタ作用で、空気室５の燃焼用空気の一部を所定の割合で吸引して、各導入口１１，１３に導入するように構成されている。
また、ガスヘッダ１８に取り付けられた濃用ガスノズル１９、淡用ガスノズル２０に燃料ガスを供給するための図外のガス供給路に開閉弁、供給ガス量を調整する調整弁がそれぞれ備えられ、装置全体として、所望の加熱量に合わせて調整することができる。
【００１７】
各濃用バ−ナ３の横側面には、濃用バ−ナ３の側面とほぼ同じ形状の板金製のカバー板２１が設けられ、そのカバー板２１が濃用バ−ナ３の炎口面６の長手方向両端部において、濃用バ−ナ３にかしめられて取り付けられている。
この各カバー板２１には、６枚の板金製の整流板２２が取り付けられ、各カバー板２１の上端と各整流板２２の上端とが、濃炎口部８の基部つまりスリット状の炎孔８ａの開口下端とほぼ同じ高さになるように構成されている。
【００１８】
具体的に燃焼過程を説明すると、ガス供給路により供給された燃料ガスを、濃用ガスノズル１９、淡用ガスノズル２０を通して、エゼクタ作用により空気室５の燃焼用空気の一部を所定の割合で吸引して、濃用導入口１１、淡用導入口１３にそれぞれ導入する。
そして、濃用導入口１１より供給された燃料ガスと空気室５より供給された燃焼用空気とが濃用混合室１０で混合され、空気混合率の小さい濃混合気を、炎口面６の濃炎口部８より噴出する。また一方で、淡用導入口１３より供給された燃料ガスと空気室５より供給された燃焼用空気とを、淡用ガス導通路１２を通して淡用ガス導通路１２に穿設されている多数の噴出孔１４から噴出して淡用混合室１６で混合され、淡炎口部１５から空気混合率の大きい淡混合気を噴出する。このように、濃炎口部８から噴出される濃混合気を燃焼させ、濃炎口部８に生成される濃火炎により、淡火炎に対する保炎をすることになる。
【００１９】
その際に、炎口面６を形成する炎口板７の横断面形状をほぼ半円形の形状に構成し、その炎口板７の全幅にわたって炎口面６の幅方向に直線形のスリット状の炎孔８ａを備えることにより、濃炎口部８に生成される濃火炎が、炎口面６の幅方向に広がった形状に生成される。つまり、淡炎口部１５を炎口面６の幅方向に適宜広げても、濃火炎による淡火炎の保炎をすることができる。このように、濃火炎による淡火炎の保炎をしながら、淡混合気に対する濃混合気の比率を小さくすることができる。
このように、淡混合気に対する濃混合気の比率を小さくすることにより、図５に示す濃淡燃焼装置の燃焼特性から明らかなように、ＮＯｘの発生を低減できる。しかし、極端に空気比を大きくすると、一酸化炭素であるＣＯの発生を増大するので、空気比を適宜選択して、濃火炎による淡混合気に対する保炎効果を損なうことなく、ＮＯｘの発生を低減しながら、ＣＯの発生をも抑制することができる。
【００２０】
〔別実施形態〕
（１）上記実施形態では、同じ数の濃炎口部８を備えた濃用バ−ナ３が、炎口面の幅方向に並設されているが、並設する濃用バ−ナ３の一部を濃炎口部８の数が少ない濃用バ−ナ３ａに置き換えてもよい。
例えば図６に示すように、濃炎口部８の数の少ない濃用バ−ナ３ａは、炎口面６の長手方向両端部に濃炎口部８を配設し、さらに、その両端部よりも外側に、平面視においてＵ字形のスリット状の炎孔８ｂを設け、その両端部よりも外側に淡混合気が流出するのを防ぎ、その両端部に備えられた濃炎口部８の間にひとつまたは複数の濃炎口部８が備えられている濃用バ−ナ３ａを設ける構成にしてもよい。または、炎口面６の長手方向両端部だけに濃炎口部８を備える構成としてもよい。
【００２１】
そして、炎口面６の幅方向において、両端部に濃炎口部８の数の多い濃用バ−ナ３を配設し、その間にひとつまたは複数の濃用バ−ナ３ａを並設するものを１ブロックとして、このブロックを複数個並設する構成としてもよい。
このようにして、さらに、淡混合気に対する濃混合気の比率を小さくして、ＮＯｘの発生を低減することができる。
【００２２】
（２）上記実施形態では、炎口板７の横断面形状をほぼ半円形としたが、例えば、図７、図８に示すように、炎口板７を三角形または四角形などの横断面形状としてもよい。
具体的に説明すると、炎口面６を形成する炎口板７の横断面形状を三角形または四角形として、濃混合気の噴出方向に膨出して、その膨出させた三角形または四角形の炎口板７に、先の実施形態と同様なスリット状の炎孔８ａを形成してもよい。
また、炎口板７を、半円形にする場合において、必ずしも完全な半円形でなく円弧などに構成してもよい。
【００２３】
（３）上記実施形態では、炎口面６の長手方向最端に位置する濃炎口部８よりも外側に、平面視においてほぼＵ字状の炎孔８ｂを設ける構成としているが、Ｕ字状のものに限らず、Ｖ字状のものなど他の形状をする構成のものでもよい。
【００２４】
（４）上記実施形態に付け加えて、遮蔽部材としての遮蔽板２３を濃用バ−ナ３の両側面の全長にわたって備える構成としてもよい。
図９に基づいて説明すると、濃用バ−ナ３の横側面つまり図９において、濃用バ−ナ３の右側横側面には、濃用バ−ナ３の横側面とほぼ同じ形状の板金製のカバー板２１が設けられ、そのカバー板２１が濃用バ−ナ３の炎口面６の長手方向両端部において、濃用バ−ナ３にかしめられて取り付けられている。
この各カバー板２１には、遮蔽部材としての遮蔽板２３が上方に向けて一体的に設けられていて、この遮蔽板２３の上端が、濃炎口部８の基部つまりスリット状の炎孔８ａの開口下端よりも適宜上方に突出しているので、図９において、濃用バ−ナ３の左側から淡混合気が流入するのを防いでいる。
また、図９において、濃用バ−ナ３の右側側面には、整流板２２とは別に遮蔽部材としての遮蔽板２３が設けられ、この遮蔽板２３が、スリット状の炎孔８ａの開口下端よりも適宜上方に突出しているので、図９において、濃用バ−ナ３の右側から淡混合気が流入するのを防いでいる。
このような構成にすることにより、各濃用バ−ナ３の両横側面に遮蔽板２３が設けられ、濃炎口部８に生成される濃火炎を広がった形状に保ちつつ、淡混合気が濃火炎側へ流入するのを抑制して、濃火炎のリフト現象を防止することができる。
【００２５】
尚、図７、図８に示したような、炎口板７の横断面形状が三角形または四角形の濃用バ−ナ３に遮蔽部材としての遮蔽板２３を設けてもよい。
【００２６】
（５）上記別実施形態では、遮蔽板２３の上端部が、濃炎口部８の基部よりも適宜上方に突出するように構成したが、さらに、図１０に示すように、遮蔽板２３の上端を淡混合気が噴出する淡炎口部１５側に折曲するような構成として、濃火炎のリフト現象を防止してもよい。
（６）上記別実施形態では、両側面の全長にわたって、遮蔽板２３を設ける構成としているが、濃炎口部８に対応する箇所だけ濃用バ−ナ３の両側面に遮蔽部材を設ける構成としてもよい。
図１１に基づいて説明すると、濃用バ−ナ３どうしの間に備えられた整流板２２において、両端つまり図１１において、濃用バ−ナ３に最も近い整流板２２を、濃炎口部８に対応する箇所だけ濃用バ−ナ３側にプレス加工により膨出させ、その膨出部を遮蔽部材２３として濃火炎のリフト現象を防止するように構成してもよい。
【図面の簡単な説明】
【図１】濃淡燃焼装置の一部切欠き斜視図
【図２】濃淡燃焼装置の縦断正面図
【図３】濃淡燃焼装置を構成する濃用バ−ナの斜視図
【図４】濃淡燃焼装置を構成する濃用バ−ナの配列図
【図５】濃淡燃焼装置の燃焼特性グラフ
【図６】別実施形態の濃淡燃焼装置を構成する濃用バ−ナの配列図
【図７】別実施形態の濃淡燃焼装置の縦断正面図
【図８】別実施形態の濃淡燃焼装置の縦断正面図
【図９】別実施形態の濃淡燃焼装置の縦断正面図
【図１０】別実施形態の濃淡燃焼装置の縦断正面図
【図１１】別実施形態を示す濃淡燃焼装置の平面図と一部切欠き斜視図
【符号の説明】
３濃用バ−ナ
６炎口面
７炎口板
８濃炎口部
８ａスリット状の炎孔
８ｂＵ字形のスリット状の炎孔
１５淡炎口部
２３遮蔽板[0001]
BACKGROUND OF THE INVENTION
The present invention is provided with a plurality of concentrated flames provided with a plurality of concentrated flame ports which are provided with a long and narrow flame mouth surface on one end side, and a rich mixture of fuel gas and combustion air is jetted and burned on the flame surface. Burners are arranged side by side in the width direction of the flame mouth surface, and a pale flame mouth portion for injecting and burning a light mixture of fuel gas and combustion air between the flame mouth surfaces. The present invention relates to a concentration combustion apparatus that is provided and has a flame opening surface of the concentration burner and the light flame opening portion adjacent to each other.
[0002]
[Prior art]
In the conventional light and dark combustion apparatus, generally, the cross-sectional shape of the flame mouth plate that forms the flame mouth surface of the burner for thickening is formed into a U-shape with the upper surface closed, and the horizontal middle portion of the flat upper surface is formed. A slit-shaped flame hole was formed on the surface.
[0003]
[Problems to be solved by the invention]
Normally, in the lean combustion apparatus, when the ratio of the rich mixture to the lean mixture becomes small, the generation value of NOx which is nitrogen oxides as a whole becomes low. Therefore, in order to reduce the generation value of NOx, the interval between the burner burners is widened, the pale flame mouth is widened in the width direction of the flame mouth surface, and the ratio of the rich mixture to the pale mixture is reduced. However, in that case, the ejection width of the light mixture becomes too wide, which causes a problem that the light mixture cannot be combusted sufficiently.
[0004]
The present invention has been made paying attention to such a problem, and its purpose is to hold the light flame well with the rich flame while reducing the ratio of the rich mixture to the light mixture to reduce NOx. It is to reduce the generation as much as possible.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, in the enrichment burner having a plurality of enrichment flame outlets for ejecting the rich mixture, the flame orifice that forms the entire flame orifice surface of the enrichment burner. The plate is formed into a bulging shape whose cross-sectional shape bulges in the direction of jetting the rich mixture, and the thick flame mouth part extends across the width of the flame mouth plate along the width direction of the flame mouth surface. The slit-shaped flame hole is formed over the entire width of the bulge-shaped flame mouth plate, and the light flame mouth portion has a flow straightening plate along the longitudinal direction of the flame mouth surface of the concentration burner. Is provided so that the upper end thereof is substantially the same height as the lower end of the slit-shaped flame hole of the rich flame port.
In other words, the cross-sectional shape of the flame mouth plate is formed into a bulging shape that swells in the direction of jetting of the rich mixture, and a slit-like flame hole is formed along the width direction of the flame mouth surface over the entire width of the flame mouth plate. Therefore, the rich flame generated by the rich mixture becomes a shape that spreads in the width direction of the flame mouth plate. Therefore, the contact with the light air-fuel mixture ejected from the light flame mouth portion adjacent in the width direction of the flame mouth plate is improved, and the rich flame can more effectively hold the flame against the light flame.
In this way, by improving the flame holding effect on the light mixture by the rich flame, the light mixture can be sufficiently expanded even if the portion of the light flame that ejects the light mixture is appropriately expanded in the width direction of the flame mouth plate. The ratio of the rich air-fuel mixture to the light air-fuel mixture can be reduced.
[0006]
Therefore, the ratio of the rich air-fuel mixture to the light air-fuel mixture can be reduced while holding the flame against the light air-fuel mixture by the rich flame, and the generation of NOx can be reduced.
[0007]
According to invention of Claim 2, the cross-sectional shape of a flame mouth board is formed in a substantially semicircle, and the said rich flame mouth part is comprised by several substantially semicircle slit-like flame holes. is there.
That is, by configuring the cross-sectional shape of the flame mouth plate to be almost semicircular, the light mixture easily flows in the direction of the rich flame mouth along the semicircle of the flame mouth plate. Then, by forming the rich flame mouth portion with a plurality of substantially semicircular slit-shaped flame holes, the contact between the plurality of rich flames generated in the slit-shaped flame holes and the light mixture is good. Thus, the light air-fuel mixture can be combusted sufficiently.
[0008]
Accordingly, the cross-sectional shape of the flame mouth plate is substantially semicircular, and the rich flame mouth portion is constituted by a plurality of substantially semicircular slit-shaped flame holes, thereby protecting against a light flame caused by the rich flame. The flame can be made even more effective.
[0009]
According to invention of Claim 3, the said rich flame mouth part is arrange | positioned over the full length along the longitudinal direction of a flame mouth surface, and the rich flame mouth part located in the extreme end of the said flame mouth surface On the outside, there is provided a substantially U-shaped slit-shaped flame hole in plan view.
In other words, by disposing the rich flame mouth part over substantially the entire length along the longitudinal direction of the flame mouth surface, it is possible to hold the flame against the light flame due to the rich flame also in the longitudinal direction of the flame mouth surface. Moreover, by providing a U-shaped flame hole on the outer side from the rich flame mouth portion located at the extreme end of the flame front surface, the outer side outside the rich flame mouth portion located at the extreme end of the flame front surface. A rich flame heading toward the engine can be generated, and the outward air-fuel mixture can be prevented from flowing out, and incomplete combustion or the like can be prevented.
[0010]
Therefore, for example, in a concentration combustion apparatus in which an air curtain portion for preventing condensation or the like of the concentration combustion apparatus is provided outside both end portions in the longitudinal direction of the flame front surface, a light mixture is added to the air curtain portion. It is possible to prevent problems such as incomplete combustion from occurring while preventing the outflow of the fuel and preventing the condensation of the concentration combustion apparatus.
[0011]
According to the fourth aspect of the present invention, the shielding member for suppressing the inflow of the light air-fuel mixture to the rich flame mouth is provided on the lateral side of the rich burner.
In other words, in the width direction of the flame front surface, it is suppressed that the light air mixture ejected from the adjacent light flame mouth portion flows into the rich flame mouth portion at a high speed and lifts the rich flame. While making good contact with the flame, the lift phenomenon of the rich flame due to the light mixture can be suppressed, and stable combustion can be achieved.
[0012]
According to the invention described in claim 5, the shielding member is constituted by a plate-like shielding plate, and the shielding plate is disposed on both lateral sides of the concentration burner along the longitudinal direction of the flame opening surface. And the end of the shielding plate in the light mixture ejection direction is positioned on the lower side of the rich mixture ejection direction from the base of the rich flame port.
That is, since the shielding member is composed of a plate-shaped shielding plate, the shielding member can be made relatively easily by sheet metal or the like, and is provided over substantially the entire length along the longitudinal direction of the flame opening surface. In addition, it is possible to reliably suppress the inflow of the light mixture to the rich flame and to perform more stable combustion.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, as shown in FIGS. 1 and 2, the light and dark combustion apparatus includes a burner case 1 and an inner box-like frame body 2 in the burner case 1, and the cross section of the upper surface has a substantially semicircular shape. A plurality of thickening burners 3 are housed in a box-like frame 2 in parallel with a predetermined interval.
Below the burner case 1, a fan 4 for supplying combustion air is provided, and its discharge port communicates with an air chamber 5 formed between the bottom of the burner case 1 and the bottom of the box-like frame 2. ing.
[0014]
The rich burner 3 is for ejecting and burning a rich air-fuel mixture with a small air mixing ratio, and as shown in FIG. 3, a flame mouth plate that forms a slender flame face 6 on the upper surface thereof. 7 has a substantially semicircular cross-sectional shape, and bulges in the direction of jetting the rich mixture. The flame mouth surface 6 has a plurality of rich flame mouth portions 8 for ejecting the rich mixture and a plurality of flameless mouth portions 9 not ejecting the rich mixture in the longitudinal direction of the flame mouth surface 6. It is alternately arranged along.
As shown in FIG. 3 and FIG. 4, each rich flame mouth portion 8 extends along the flame mouth plate 7 swelled in a substantially semicircular shape over the entire width of the flame mouth plate 7 in the plan view. It is composed of three slit-shaped flame holes 8a for jetting a straight rich gas mixture in the width direction, and this rich flame mouth 8 is disposed over the entire length along the longitudinal direction of the flame mouth surface 6, and the flame A substantially U-shaped slit-shaped flame hole 8b is provided on the outer side of the rich flame mouth portion 8 positioned at the extreme end in the longitudinal direction of the mouth surface 6 in a plan view for preventing the outflow of the light mixture.
The enrichment burner 3 is provided with a enrichment mixing chamber 10 communicating with each enrichment flame opening 8 and an enrichment introduction port 11 for introducing fuel gas and combustion air into the enrichment mixing chamber 10. It has been.
[0015]
As shown in FIGS. 1 and 2, the thickening burners 3 having such a structure are arranged side by side in the width direction of the flame front surface 6, and are arranged between adjacent thickening burners 3. Is formed with a light mixing chamber 16 having an elongated light flame mouth portion 15 for jetting a light air-fuel mixture having a large air mixing ratio, and further, a mixture of fuel gas and combustion air is supplied to the light mixing chamber 16. A light gas conduction path 12 to be supplied and a light introduction port 13 for introducing fuel gas and combustion air into the light gas conduction path 12 are also provided. The light gas conduction path 12 has a number of ejection holes 14. Is drilled.
Then, the light mixture is supplied to the light mixing chamber 16 through the ejection holes 14 of the light gas conduction path 12, and the air conditioning perforated plate 17 that forms the bottom wall of the box-shaped frame 2 is provided. The combustion air can be supplied upward from the air chamber 5 via the air chamber 5.
[0016]
The enrichment inlet 11 and the pale inlet 13 provided in each enrichment burner 3 are all arranged in parallel in the same direction, and the enrichment fuel gas and the pale fuel gas are distributed on the front surface thereof. A gas header 18 to be supplied is provided, and a thickening gas nozzle 19 attached to the gas header 18 faces each thickening introduction port 11, and a light gas nozzle 20 faces each light introduction port 13. , 20 is configured so that a part of the combustion air in the air chamber 5 is sucked at a predetermined ratio and introduced into the introduction ports 11, 13 by the ejector action by injecting fuel gas from the fuel gas.
Further, a gas supply path (not shown) for supplying fuel gas to the gas nozzle for concentration 19 and the gas nozzle for light 20 attached to the gas header 18 are provided with an on-off valve and an adjustment valve for adjusting the amount of supplied gas, respectively. As described above, it can be adjusted in accordance with a desired heating amount.
[0017]
A sheet metal cover plate 21 having substantially the same shape as the side surface of the concentration burner 3 is provided on the lateral side surface of each concentration burner 3, and the cover plate 21 is the flame outlet of the concentration burner 3. At both ends in the longitudinal direction of the surface 6, it is caulked and attached to the dark burner 3.
Each cover plate 21 is provided with six sheet metal rectifying plates 22, and the upper end of each cover plate 21 and the upper end of each rectifying plate 22 are the base of the rich flame port 8, that is, a slit-shaped flame hole. It is comprised so that it may become substantially the same height as the opening lower end of 8a.
[0018]
Specifically, the combustion process will be described. The fuel gas supplied through the gas supply passage is sucked through the thickening gas nozzle 19 and the light gas nozzle 20 to a part of the combustion air in the air chamber 5 at a predetermined rate by the ejector action. And it introduce | transduces into the inlet 11 for darkness, and the inlet 13 for light, respectively.
Then, the fuel gas supplied from the enrichment inlet 11 and the combustion air supplied from the air chamber 5 are mixed in the enrichment mixing chamber 10, and the rich mixture having a low air mixing ratio is mixed with the flame front surface 6. It ejects from the rich flame mouth 8. On the other hand, the fuel gas supplied from the light introduction port 13 and the combustion air supplied from the air chamber 5 are formed in the light gas conduction passage 12 through the light gas conduction passage 12. The light mixture is ejected from the ejection hole 14 and mixed in the light mixing chamber 16, and a light air mixture having a large air mixing ratio is ejected from the light flame opening 15. In this way, the rich air-fuel mixture ejected from the rich flame port 8 is burned, and the rich flame generated in the rich flame port 8 holds the flame against the light flame.
[0019]
At that time, the cross-sectional shape of the flame mouth plate 7 forming the flame mouth surface 6 is formed in a substantially semicircular shape, and the slit shape is linear in the width direction of the flame mouth surface 6 over the entire width of the flame mouth plate 7. By providing this flame hole 8 a, the rich flame generated at the rich flame port 8 is generated in a shape spreading in the width direction of the flame port surface 6. That is, even if the light flame mouth portion 15 is appropriately expanded in the width direction of the flame mouth surface 6, it is possible to hold the light flame by the rich flame. In this way, the ratio of the rich mixture to the light mixture can be reduced while holding the light flame by the rich flame.
Thus, by reducing the ratio of the rich air-fuel mixture to the light air-fuel mixture, it is possible to reduce the generation of NOx, as is clear from the combustion characteristics of the lean combustion device shown in FIG. However, if the air ratio is extremely increased, the generation of CO, which is carbon monoxide, increases. Therefore, the air ratio is appropriately selected, and the generation of NOx can be achieved without impairing the flame holding effect on the light mixture by the rich flame. While reducing, CO generation can also be suppressed.
[0020]
[Another embodiment]
(1) In the above embodiment, the thickening burners 3 having the same number of thick flame opening portions 8 are arranged side by side in the width direction of the flame front surface. May be replaced with a thick burner 3a having a small number of thick flame openings 8.
For example, as shown in FIG. 6, a thickening burner 3 a having a small number of rich flame ports 8 is provided with deep flame ports 8 at both ends in the longitudinal direction of the flame port surface 6, and further, both end portions thereof. A U-shaped slit-shaped flame hole 8b in a plan view is provided on the outer side to prevent the light air-fuel mixture from flowing out to the outer side of the both end portions of the rich flame mouth portion 8 provided at the both end portions. You may make it the structure which provides the burner 3a for thickening in which the one or several rich flame mouth part 8 is provided in between. Or it is good also as a structure provided with the rich flame mouth part 8 only in the longitudinal direction both ends of the flame face 6.
[0021]
Then, in the width direction of the flame opening surface 6, the thickening burners 3 having a large number of the thick flame opening portions 8 are disposed at both ends, and one or a plurality of thickening burners 3a are arranged in parallel therebetween. One block may be provided, and a plurality of such blocks may be arranged side by side.
In this way, the ratio of the rich mixture to the light mixture can be reduced to reduce the generation of NOx.
[0022]
(2) In the above embodiment, the cross-sectional shape of the flame mouth plate 7 is substantially semicircular. However, for example, as shown in FIGS. 7 and 8, the flame mouth plate 7 has a cross-sectional shape such as a triangle or a quadrangle. Also good.
More specifically, the cross-sectional shape of the flame mouth plate 7 that forms the flame mouth surface 6 is triangular or quadrangular, and bulges in the direction of the rich mixture, and the flared triangular or square flame mouth plate 7 may be formed with a slit-shaped flame hole 8a similar to the previous embodiment.
Moreover, when making the flame-mouth plate 7 into a semicircle, you may comprise not only a perfect semicircle but a circular arc.
[0023]
(3) In the above embodiment, the U-shaped flame hole 8b is provided on the outside of the rich flame mouth portion 8 located at the extreme end in the longitudinal direction of the flame face 6 in a plan view. However, the configuration may be other shapes such as a V shape.
[0024]
(4) In addition to the above embodiment, the shielding plate 23 as a shielding member may be provided over the entire length of both side surfaces of the dark burner 3.
Referring to FIG. 9, a sheet metal having substantially the same shape as the lateral side surface of the thickening burner 3 is disposed on the lateral side surface of the thickening burner 3, that is, the right lateral surface of the thickening burner 3 in FIG. 9. A cover plate 21 made of metal is provided, and the cover plate 21 is attached by being caulked to the concentration burner 3 at both longitudinal ends of the flame front surface 6 of the concentration burner 3.
Each cover plate 21 is integrally provided with a shielding plate 23 as a shielding member facing upward, and the upper end of the shielding plate 23 is the base of the rich flame port 8, that is, the slit-shaped flame hole 8a. 9, the air mixture is prevented from flowing in from the left side of the thickening burner 3 in FIG. 9.
In FIG. 9, a shielding plate 23 as a shielding member is provided on the right side surface of the dark burner 3 in addition to the rectifying plate 22, and this shielding plate 23 is the lower end of the slit-shaped flame hole 8a. 9, the air-fuel mixture is prevented from flowing from the right side of the thickening burner 3 in FIG.
With such a configuration, the shielding plates 23 are provided on both lateral sides of each thickening burner 3, and the light mixture is maintained while keeping the rich flame generated at the thick flame opening 8 in an expanded shape. Can be prevented from flowing into the rich flame side, and the lift phenomenon of the rich flame can be prevented.
[0025]
In addition, you may provide the shielding board 23 as a shielding member in the darkening burner 3 whose cross-sectional shape of the flame mouth board 7 is a triangle or a square as shown in FIG. 7, FIG.
[0026]
(5) In the other embodiment, the upper end portion of the shielding plate 23 is configured to protrude appropriately upward from the base portion of the rich flame port portion 8, but as shown in FIG. The lift phenomenon of the rich flame may be prevented by a configuration in which the upper end is bent toward the side of the light flame outlet 15 where the light mixture is ejected.
(6) In the above-described another embodiment, the shielding plate 23 is provided over the entire length of both side surfaces. However, the shielding member is provided on both side surfaces of the concentration burner 3 only at locations corresponding to the rich flame port 8. It is good.
Referring to FIG. 11, in the rectifying plate 22 provided between the thickening burners 3, both ends, that is, the rectifying plate 22 closest to the thickening burner 3 in FIG. It is also possible to swell only the portion corresponding to 8 to the thickening burner 3 side by press working, and to use the bulging portion as a shielding member 23 to prevent the deep flame lift phenomenon.
[Brief description of the drawings]
FIG. 1 is a partially cutaway perspective view of a concentration combustion apparatus. FIG. 2 is a longitudinal front view of the concentration combustion apparatus. FIG. 3 is a perspective view of a concentration burner constituting the concentration combustion apparatus. [Fig. 5] Combustion characteristic graph of the concentration burner [Fig. 6] Arrangement diagram of the concentration burner constituting the concentration burner of another embodiment [Fig. 7] Separate implementation FIG. 8 is a vertical front view of a concentration combustion apparatus according to another embodiment. FIG. 9 is a vertical front view of a concentration combustion apparatus according to another embodiment. FIG. 10 is a concentration combustion apparatus according to another embodiment. [FIG. 11] A plan view and a partially cutaway perspective view of a concentration combustion apparatus showing another embodiment [Explanation of symbols]
3 Concentration Burner 6 Flame Port Surface 7 Flame Port Plate 8 Rich Flame Port Portion 8a Slit Flame Port 8b U-shaped Slit Flame Hole 15 Pale Flame Port Portion 23 Shielding Plate

Claims

細長い炎口面を一端側に備え、その炎口面に燃料ガスと燃焼用空気との濃混合気を噴出して燃焼させる複数個の濃炎口部を備えた複数の濃用バ−ナを、前記炎口面の幅方向に間隔を隔てて並設し、前記濃用バ−ナの炎口面どうしの間に燃料ガスと燃焼用空気との淡混合気を噴出して燃焼させる淡炎口部を設けて、前記濃用バ−ナの炎口面と前記淡炎口部とを隣接してある濃淡燃焼装置であって、
前記濃用バ−ナの炎口面の全体を形成する炎口板を、横断面形状が濃混合気の噴出方向に膨出する膨出形状に形成し、かつ、前記濃炎口部を炎口面の幅方向に沿うスリット状の炎孔で構成し、そのスリット状の炎孔を前記膨出形状の炎口板の全幅にわたって形成してあり、
前記淡炎口部には、前記濃用バーナの炎口面の長手方向に沿う整流板を、その上端が前記濃炎口部の前記スリット状の炎孔の開口下端とほぼ同じ高さになるように設けてある濃淡燃焼装置。A plurality of thick burners having a plurality of thick flame mouth portions that are provided with an elongated flame mouth surface on one end side, and a rich mixture of fuel gas and combustion air is jetted and burned on the flame face. And a flame which is burnt by arranging a light mixture of fuel gas and combustion air between the flame mouth surfaces of the enrichment burner, arranged side by side in the width direction of the flame mouth surface. A concentration burner provided with a mouth portion and adjacent to the flame mouth surface of the thickening burner and the light flame mouth portion,
A flame mouth plate that forms the whole flame mouth surface of the rich burner is formed in a bulging shape with a cross-sectional shape bulging in the direction of jetting of the rich mixture, and the rich flame mouth portion is flamed. constituted by slit-like flame holes along the width direction of the mouth surface, Ri tare and form a slit-shaped flame holes over the entire width of the burner port plate of the bulging shape,
The baffle plate has a baffle plate along the longitudinal direction of the flame port surface of the thick burner, and the upper end of the baffle port is substantially the same height as the lower end of the slit-shaped flame hole of the thick flame port. A light and dark combustion apparatus provided as described above .

前記炎口板の横断面形状をほぼ半円形に形成し、かつ、前記濃炎口部を複数個のほぼ半円形のスリット状の炎孔で構成してある請求項１に記載の濃淡燃焼装置。 2. The light / dark combustion apparatus according to claim 1, wherein a cross-sectional shape of the flame mouth plate is formed in a substantially semicircular shape, and the rich flame mouth portion is constituted by a plurality of substantially semicircular slit-shaped flame holes. .

前記濃炎口部を炎口面の長手方向に沿ってほぼ全長にわたって配設し、かつ、前記炎口面の最端に位置する濃炎口部より外側に、平面視においてほぼＵ字形のスリット状の炎孔を設けてある請求項１または２に記載の濃淡燃焼装置。 The rich flame mouth portion is disposed over substantially the entire length along the longitudinal direction of the flame mouth surface, and is a slit that is substantially U-shaped in plan view outside the rich flame mouth portion located at the extreme end of the flame mouth surface. 3. The concentration combustion apparatus according to claim 1 or 2, wherein a flame-shaped flame hole is provided.

前記濃用バ−ナの横側方に前記濃炎口部への淡混合気の流入を抑制する遮蔽部材を設けてある請求項１〜３のいずれか１項に記載の濃淡燃焼装置。 The concentration burner according to any one of claims 1 to 3, wherein a shielding member that suppresses inflow of a light mixture to the concentration flame mouth is provided laterally of the concentration burner.

前記遮蔽部材を板状の遮蔽板で構成し、その遮蔽板を前記炎口面の長手方向に沿って、前記濃用バ−ナの両横側方の全長にわたって位置させ、かつ、前記遮蔽板の淡混合気噴出方向の端部を前記濃炎口部の基部よりも濃混合気の噴出方向下手側に位置させてある請求項４に記載の濃淡燃焼装置。 The shielding member is composed of a plate-like shielding plate, and the shielding plate is positioned over the entire length of both lateral sides of the concentration burner along the longitudinal direction of the flame opening surface, and the shielding plate 5. The lean combustion apparatus according to claim 4, wherein an end portion of the lean mixture in the direction of jetting of the lean mixture is positioned on the lower side in the jet direction of the rich mixture from the base of the rich flame outlet.