JPH0627569B2 - Gas burner - Google Patents
Gas burnerInfo
- Publication number
- JPH0627569B2 JPH0627569B2 JP2046644A JP4664490A JPH0627569B2 JP H0627569 B2 JPH0627569 B2 JP H0627569B2 JP 2046644 A JP2046644 A JP 2046644A JP 4664490 A JP4664490 A JP 4664490A JP H0627569 B2 JPH0627569 B2 JP H0627569B2
- Authority
- JP
- Japan
- Prior art keywords
- flame
- mixed gas
- combustion
- gas
- ejected
- 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.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
- F23N2237/16—Controlling secondary air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
- F23N2237/24—Controlling height of burner
- F23N2237/32—Nox
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
- Feeding And Controlling Fuel (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は例えば給湯器等に使用されるガスバーナであっ
て、ガス燃料と燃焼用空気とを混合した混合ガスを噴出
する炎口を設け、この炎口より噴出する混合ガスの火炎
に対して燃焼用二次空気を噴出する吐出口を形成してあ
るガスバーナに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is a gas burner used in, for example, a water heater, which is provided with a flame port for ejecting a mixed gas in which a gas fuel and combustion air are mixed, The present invention relates to a gas burner having a discharge port for ejecting secondary air for combustion to the flame of a mixed gas ejected from the flame port.
従来、このようなガスバーナにおいては、前記吐出口か
らは二次空気のみを噴出させる構成となっていた。Conventionally, in such a gas burner, only secondary air is ejected from the discharge port.
しかし、炎口からは混合ガスを噴出させ、これに対し吐
出口からは二次空気のみを噴出させる上述の従来構成に
おいては、NOx の発生が約80ppm(O2＝０％）を限度とし
て低減できず、このため、インプットが大きくて燃焼量
が大のときNOx の総発生量がかなりの大きな値となる問
題があった。However, in the above-mentioned conventional configuration in which the mixed gas is ejected from the flame port and only the secondary air is ejected from the ejection port, NOx generation is reduced to a limit of about 80 ppm (O 2 = 0%). Therefore, there was a problem that the total amount of NOx generated would be quite large when the input was large and the combustion amount was large.
そこで、この問題を解消するための一手段として、前記
吐出口からは二次空気に代えて、例えば空気過剰率が1.
3〜1.7程度の希薄予混合ガスや1.7 以上の超希薄予混合
ガス等の希薄混合ガスを噴出させるようにし、これに対
し、前記炎口からの混合ガス噴出量は上記希薄混合ガス
の燃焼量に相当する分だけ減じた量に制限し、もって、
炎口より噴出した混合ガスの火炎は主に保炎用として、
その保炎作用により吐出口からの噴出希混合ガスを安定
燃焼させることで、全体としての燃焼量は同一量に維持
しながら、上記希薄燃焼の効果としてNOx 値を低減する
ことを考えた。Therefore, as one means for solving this problem, instead of the secondary air from the discharge port, for example, the excess air ratio is 1.
A lean mixed gas such as a lean premixed gas of about 3 to 1.7 or an ultra-lean premixed gas of 1.7 or more is ejected, while the amount of mixed gas ejected from the flame port is the combustion amount of the above lean mixed gas. It is limited to the amount corresponding to
The flame of the mixed gas ejected from the flame mouth is mainly for flame holding,
It was considered that the NOx value is reduced as an effect of the lean combustion while maintaining the same overall combustion amount by stably burning the rare mixed gas ejected from the discharge port by the flame holding action.
しかしながら、この手段では下記の如き問題が派生し
た。However, the following problems have arisen by this means.
すなわち、インプットを絞って炎口よりの噴出混合ガス
の火炎を小さくしたとき、吐出口よりの噴出希薄混合ガ
スの一部が炎口よりの噴出混合ガスの火炎の到達位置よ
り更に先端側に放出されて、未燃ガスのままで排ガス中
に混入し、このためハイドロカーボン値が高くなる等の
別の面での問題が生じた。That is, when the flame of the mixed gas ejected from the flame outlet is reduced by narrowing the input, a part of the lean mixed gas ejected from the discharge outlet is released further to the tip side than the arrival position of the flame of the ejected mixed gas ejected from the flame outlet. As a result, unburned gas remains mixed in the exhaust gas, which causes another problem such as an increase in hydrocarbon value.
本発明の目的は、合理的な改良により、上述問題の派生
を回避しながら、低NOx 化を達成する点にある。An object of the present invention is to achieve a low NOx emission while avoiding the derivation of the above-mentioned problems by a reasonable improvement.
本発明によるガスバーナの特徴構成は、前記吐出口から
前記燃焼用二次空気を噴出する状態と前記炎口より噴出
する混合ガスよりも希薄な希薄混合ガスを噴出する状態
とに切換える手段を設けてある点にあり、その作用効果
は次の通りである。The characteristic configuration of the gas burner according to the present invention is provided with means for switching between a state of ejecting the secondary air for combustion from the discharge port and a state of ejecting a lean mixed gas leaner than the mixed gas ejected from the flame port. There is a certain point, and the action and effect are as follows.
つまり、吐出口から炎口より噴出する混合ガスよりも希
薄な希薄混合ガスを噴出させるとすると、炎口よりの噴
出混合ガスの火炎が小さいために噴出希薄混合ガスの一
部が未燃状態のままで排出されてしまうこととなるよう
な小インプット状態では、希薄混合ガスの未燃状態のま
までの排出を回避すべく、吐出口から二次空気を噴出さ
せる状態とする。In other words, if a lean mixed gas, which is leaner than the mixed gas ejected from the flame outlet, is ejected from the discharge port, a part of the ejected lean mixed gas is in an unburned state because the flame of the ejected mixed gas from the flame orifice is small. In a small input state in which the exhaust gas is exhausted, the secondary air is ejected from the discharge port in order to avoid the exhaustion of the lean mixed gas in the unburned state.
ところで、この状態では従来と同様の燃焼形態となって
NOx 値の低減限界は80ppm 程度となるが、小インプット
状態での実施であって炎口からの混合ガスの噴出量（燃
焼量）そのものが小さいから、NOx の総発生量は問題と
なるほど大きな値とはならない。By the way, in this state, the combustion mode is the same as the conventional one.
Although the NOx reduction limit is about 80 ppm, the total amount of NOx generated is so large that it becomes a problem because the amount of gas (combustion amount) ejected from the flame mouth is small as it is implemented in a small input state. Does not mean
一方、炎口よりの噴出混合ガスの火炎が十分に大きく
て、噴出希薄混合ガスの未燃状態のままでの排出が起ら
ないような大インプット状態では、吐出口から希薄混合
ガスを噴出させる状態とし、これによって、先述の如
く、炎口よりの噴出混合ガスの火炎の保炎作用により吐
出口からの噴出希薄混合ガスを安定燃焼させて、この希
薄燃焼の効果として全体燃焼量を大きく稼ぎながらNOx
値を低減し、大インプット状態でのNOx の総発生量を小
量に抑制する。On the other hand, in the case of a large input state in which the flame of the mixed gas jetted from the flame outlet is sufficiently large and the discharge of the jetted lean mixed gas does not occur in the unburned state, the lean mixed gas is jetted from the discharge port. As described above, by this, the lean mixed gas jetted from the discharge port is stably burned by the flame holding effect of the flame of the mixed gas jetted from the flame port, and as a result of this lean burn, the overall combustion amount is greatly increased. While NOx
The value is reduced, and the total amount of NOx generated under large input conditions is suppressed to a small amount.
以上使用の結果、小インプット状態において希薄混合ガ
スが未燃状態のままで排出されてしまうといった不都合
な事態の発生を回避しながら、希薄燃焼による低NOx 化
効果を有効に発揮させて、低NOx 化を効果的に達成し得
るに至った。As a result of the above use, while avoiding the inconvenient situation that the lean mixed gas is discharged in the unburned state in the small input state, the NOx reduction effect by the lean combustion is effectively exerted to reduce the NOx. It has become possible to effectively achieve this.
家庭用給湯器等に採用されるガスバーナの実施例につい
て説明する。An example of a gas burner used in a household water heater will be described.
ガスバーナはバーナ本体(A) と、このバーナ本体(A) に
燃料ガスを供給する燃料ガス供給装置(B) とからなる。The gas burner includes a burner body (A) and a fuel gas supply device (B) that supplies fuel gas to the burner body (A).
バーナ本体(A) について説明する。第１図及び第４図に
示すように、バーナケーシング(1) の左右中心に中心縦
壁(2) を立設して、ケーシング(1) 内に左右二つのバー
ナ空間を形成し、左右バーナ空間に同一形状同一構成の
バーナ部を形成する。The burner body (A) will be described. As shown in Fig. 1 and Fig. 4, the central vertical wall (2) is erected at the right and left center of the burner casing (1) to form two left and right burner spaces in the casing (1). A burner portion having the same shape and the same structure is formed in the space.
次に、左右一方のバーナ部について説明する。Next, the left and right burner portions will be described.
第１図及び第４図に示すように、前記バーナ部の上端よ
り左右一対の燃焼面形成用壁体(3),(4)を、下端側程近
接する状態に配設して、バーナ空間を三分割すると共
に、左右燃焼面形成用壁体(3),(4) で囲まれる空間を燃
焼空間(10)に形成してある。左右燃焼面形成用壁体(3),
(4)の下端を一定の間隔を持って平行に配置し、炎口部
を形成すると共に、左右燃焼面形成用壁体(3),(4) の下
端傾斜面と平行に、かつ、下端傾斜面の内方側に断面略
Ｖ字型の炎口形成材(5) を設け、更に、この左右炎口形
成材(5) の上端と前記左右の下端傾斜面とで夫々左右一
対の炎口(6),(6) を形成する。前記炎口(6) を平面視で
長方形に形成し、バーナケーシング(1) の長辺方向に沿
って炎口(6) の長辺を沿わせた状態で前記炎口(6) を位
置設定し、このように位置設定した複数個の炎口(6) を
前記バーナケーシング(1)の長辺方向に等間隔に配置し
てある。前記燃焼面形成用壁体(3),(4) の両下端より更
に、左右の仕切壁(7),(7) を立下げると共に、この左右
仕切壁(7),(7) の下端同士を低壁(8) で一体的に連結し
て、前記炎口(6),(6) を介して燃焼空間に連通する混合
ガス導入空間を形成する。第４図に示すように、この混
合ガス導入空間にバーナケーシング(1) の長辺方向に沿
った混合ガス噴出用ヘッダー管(9) を取付け、前記混合
ガス噴出用ヘッダー管(9) の先端に噴出口(9a)を形成
し、前記混合ガス導入空間内に混合ガスを噴出すべく構
成してある。As shown in FIGS. 1 and 4, a pair of left and right combustion surface forming walls (3) and (4) are arranged closer to the lower end side than the upper end of the burner section, and a burner space is formed. Is divided into three, and the space surrounded by the left and right combustion surface forming walls (3), (4) is formed as a combustion space (10). Left and right combustion surface forming wall (3),
The lower ends of (4) are arranged in parallel with a certain interval to form the flame openings, and the lower ends of the left and right combustion surface forming walls (3), (4) are parallel to the lower ends and A flame port forming material (5) having a substantially V-shaped cross section is provided on the inner side of the inclined surface, and further, a pair of left and right flames is formed by the upper ends of the left and right flame port forming materials (5) and the left and right lower inclined surfaces. Form mouths (6), (6). The flame opening (6) is formed in a rectangular shape in plan view, and the flame opening (6) is positioned with the long side of the flame opening (6) along the long side direction of the burner casing (1). The plurality of flame ports (6) thus positioned are arranged at equal intervals in the long side direction of the burner casing (1). The left and right partition walls (7), (7) are further lowered from both lower ends of the combustion surface forming wall bodies (3), (4), and the lower ends of the left and right partition walls (7), (7) are connected to each other. Are integrally connected by a low wall (8) to form a mixed gas introduction space communicating with the combustion space through the flame openings (6), (6). As shown in FIG. 4, the mixed gas injection header pipe (9) is installed in the mixed gas introduction space along the long side direction of the burner casing (1), and the tip of the mixed gas injection header pipe (9) is attached. A jet port (9a) is formed in the chamber to jet the mixed gas into the mixed gas introducing space.
前記バーナケーシング(1) の底面を長方形の開口に形成
し、バーナケーシング(1) における混合ガス導入空間を
除いた他の空間内に、燃焼用二次空気を導入すべく構成
すると共に、前記バーナ部における燃焼空間(10)を囲む
両側方空間(11),(11) に前記導入燃焼用二次空気を送り
込むべく連通させてある。前記燃焼面形成用壁体(3),
(4) に図示するように縦長のスリット状吐出口(12)を穿
設し、この吐出口(12)の下端を、前記炎口(6) に近接さ
せて設け、更に、その吐出口(12)の複数個をバーナケー
シング(1) 長辺方向に沿って等間隔で穿設してある。そ
して、この吐出口(12)と炎口(6) とを互いに食い違い状
態で千鳥状に配置してある。したがって、炎口(6) より
噴出する混合ガスによって燃焼する火炎の隣接するもの
の間に、前記側方空気(11)に導入された燃焼用二次空気
を吐出口(12)を通して噴出するようにしてある。The bottom surface of the burner casing (1) is formed into a rectangular opening, and the burner casing (1) is configured to introduce secondary air for combustion into the space other than the mixed gas introduction space, and the burner The two spaces (11) and (11) on both sides surrounding the combustion space (10) in the section are communicated so as to send the secondary air for introduction combustion. The combustion surface forming wall (3),
As shown in (4), a vertically elongated slit-shaped discharge port (12) is bored, and the lower end of this discharge port (12) is provided close to the flame port (6). A plurality of the burner casings (1) are provided at equal intervals along the long side direction of the burner casing (1). Then, the discharge port (12) and the flame port (6) are arranged in a staggered manner in a state of staggering each other. Therefore, the secondary air for combustion introduced into the side air (11) should be jetted through the discharge port (12) between adjacent flames burned by the mixed gas jetted from the flame port (6). There is.
第４図に示すように、前記混合ガス噴出用ヘッダー管
(9) の一端を開口に形成し、この開口端に同一軸心状態
で一次燃料ガス噴出用のノズル(13)を臨ませてある。し
たがって、前記ノズル(13)より噴出された一次燃料ガス
は前記混合ガス噴出用ヘッダー管(9) に入る過程で、前
記ノズル(13)とヘッダー管(9) の開口端で作るエゼクタ
ー効果によって燃焼用空気を吸入して、ブンゼン燃焼を
行う混合ガスとなる。この混合ガスの空気過剰率は１以
下である。そして、この混合ガスは前記炎口(6),(6) よ
り噴出し吐出口(12)より噴出する燃焼用二次空気と混合
して、ブンゼン燃焼を行う。As shown in FIG. 4, the header pipe for jetting the mixed gas
One end of (9) is formed as an opening, and a nozzle (13) for ejecting the primary fuel gas is made to face the opening end in the same axial center state. Therefore, the primary fuel gas ejected from the nozzle (13) is burned by the ejector effect created at the open ends of the nozzle (13) and the header pipe (9) in the process of entering the mixed gas ejecting header pipe (9). It sucks in the working air and becomes a mixed gas for Bunsen combustion. The excess air ratio of this mixed gas is 1 or less. Then, the mixed gas is mixed with the secondary air for combustion ejected from the flame openings (6) and (6) and ejected from the ejection opening (12) to perform Bunsen combustion.
尚、第１図中(22)は多数の連通孔を平行に形成したハニ
カム状の整流体である。Incidentally, reference numeral (22) in FIG. 1 denotes a honeycomb rectifying body in which a large number of communication holes are formed in parallel.
前記バーナケーシング(1) の下半内部空間における燃焼
用二次空気導入空間に、前記ヘッダー(9) と平行に３本
の二次燃焼ガス供給管(14),(14),(14)を配置し、この二
次燃料ガス供給管(14),(14),(14)（この二次燃料ガス供
給管は燃料ガスのみを供給するもの、あるいは、ある程
度空気と混合した燃料ガスを供給するもの、いずれとし
ても良い）に形成したガス噴出口(14a) から二次燃料ガ
スを噴出させることにより、この二次燃料ガスを燃焼用
二次空気に混合させるようにしてある。したがって、前
記ガス噴出口(14a) よりの二次燃料ガスの噴出量を調節
すると、空気過剰率1.3 以上の希薄混合ガスを形成で
き、この希薄混合ガスを吐出口(12)より燃焼空間(10)に
噴出できる。Three secondary combustion gas supply pipes (14), (14), (14) are provided in parallel with the header (9) in the combustion secondary air introduction space in the lower half internal space of the burner casing (1). This secondary fuel gas supply pipe (14), (14), (14) (this secondary fuel gas supply pipe supplies only fuel gas, or fuel gas mixed with air to some extent The secondary fuel gas is mixed with the secondary air for combustion by ejecting the secondary fuel gas from the gas ejection port (14a) formed in any one. Therefore, by adjusting the injection amount of the secondary fuel gas from the gas ejection port (14a), a lean mixed gas with an excess air ratio of 1.3 or more can be formed, and the lean mixed gas is discharged from the discharge port (12) to the combustion space (10 ) Can be gushed to.
燃料ガス供給装置(B) について説明する。第５図のブロ
ック図で示すように、燃料ガス供給系路に、遮断弁(15)
及びガバナ(16)を介装すると共に、前記ガバナ(16)の下
手側で二系統に分岐し、そのうちの第１系路(17)を前記
ノズル(13)に連結し、他の第２系路(18)を前記二次燃料
ガス供給管(14)に連結し、前記第１系路(17)及び第２系
路(18)に夫々比例弁(19),(20) を介装して、燃料ガス供
給装置(B) を構成する。The fuel gas supply device (B) will be described. As shown in the block diagram of FIG. 5, the shutoff valve (15) is provided in the fuel gas supply system passage.
And the governor (16), the lower side of the governor (16) is branched into two systems, of which the first system path (17) is connected to the nozzle (13) and the other second system. The line (18) is connected to the secondary fuel gas supply pipe (14), and the first system line (17) and the second system line (18) are provided with proportional valves (19) and (20), respectively. The fuel gas supply device (B).
したがって、前記二次燃料ガス用比例弁(20)を締め切る
と、燃焼用二次空気だけが吐出口(12)より噴出し、前記
比例弁(20)を開にすると、二次燃料ガスと燃焼用二次空
気とを混合した希薄混合ガスが吐出口(12)より噴出す
る。すなわち、前記第２系路(18)と、燃焼用二次空気導
入空間に配置した前記二次燃料ガス供給管(14)と、上記
二次燃料ガス用比例弁(20)とをもって、前記吐出口(12)
から燃焼用二次空気を噴出する状態を炎口(6) より噴出
する混合ガスよりも希薄な希薄混合ガスを噴出する状態
とに切換える手段を構成してある。Therefore, when the secondary fuel gas proportional valve (20) is closed, only the secondary air for combustion is ejected from the discharge port (12), and when the proportional valve (20) is opened, the secondary fuel gas and the combustion are combusted. The diluted mixed gas mixed with the secondary air for use is jetted from the discharge port (12). That is, the discharge passage includes the second system passage (18), the secondary fuel gas supply pipe (14) arranged in the combustion secondary air introduction space, and the secondary fuel gas proportional valve (20). Exit (12)
A means for switching the state of ejecting the secondary air for combustion from the state of ejecting the lean mixed gas, which is leaner than the mixed gas ejected from the flame port (6), is configured.
以上のような構成により、インプットの小さい場合の運
転制御としては、第６図のグラフで示すように、細線で
示す一次燃料ガスだけを噴出させ、二次燃料ガスの噴出
を停止する。With the above configuration, as the operation control when the input is small, as shown in the graph of FIG. 6, only the primary fuel gas indicated by the thin line is ejected and the ejection of the secondary fuel gas is stopped.
したがって、炎口(6) より噴出する混合ガスと吐出口(1
2)より噴出する燃焼用二次空気とでバーナは燃焼する。
燃焼面形成用壁体(3),(4) に形成される火炎は、第２図
に示すように、吐出口(12)の上端には達していない。イ
ンプットが大きくなり、燃焼量が略6000Kcal/hr になる
と、第３図に示すように、前記火炎が吐出口(12)の上端
に達することになる。そこで、更に大きな燃焼量を必要
とする場合には、一次燃料ガスとともに第６図の点線で
示す二次燃料ガスを噴出させ、炎口(6) よりの混合ガス
の火炎の保炎作用により、吐出口(12)からの希薄混合ガ
スを安定燃焼させる。この6000Kcal/hr を越える燃焼量
では第６図の細線で示すように、一次燃料ガスの噴出量
を一定に維持し、両燃料ガスの合計噴出量を第６図の太
線で示すように設定する。Therefore, the mixed gas ejected from the flame port (6) and the discharge port (1
The burner burns with the secondary air for combustion that is ejected from 2).
The flame formed on the combustion surface forming walls (3) and (4) does not reach the upper end of the discharge port (12) as shown in FIG. When the input becomes large and the combustion amount becomes approximately 6000 Kcal / hr, the flame reaches the upper end of the discharge port (12) as shown in FIG. Therefore, when a larger combustion amount is required, the secondary fuel gas shown by the dotted line in FIG. 6 is ejected together with the primary fuel gas, and the flame holding effect of the flame of the mixed gas from the flame port (6) Stable combustion of the lean mixed gas from the discharge port (12). When the combustion amount exceeds 6000 Kcal / hr, as shown by the thin line in Fig. 6, the ejection amount of the primary fuel gas is kept constant, and the total ejection amount of both fuel gases is set as shown by the thick line in Fig. 6. .
尚、第７図は上述燃焼形態において一次燃料ガス側の燃
焼量（炎口(6) よりの混合ガスの燃焼量）を11500Kcal/
hrとし、二次燃料ガス側の燃焼量（吐出口(12)よりの希
薄混合ガスの燃焼量）を18500Kcal/hrとしたときにおい
て、トータルの空気過剰率（すなわち、炎口(6) よりの
混合ガスの空気過剰率と吐出口(12)よりの希薄混合ガス
の空気過剰率とを、それら混合ガスの噴出量と希薄混合
ガスの噴出量との比をもって比例配分した平均値）を変
化させた場合のNOx 値（実線）及びCo値（破線）を示す
グラフであり、炎口(6) よりの混合ガスの火炎の保炎作
用により吐出口(12)よりの希薄混合ガスを安定燃焼させ
る前述の燃焼形態において、上記トータル空気過剰率を
適当値に設定することによりNOx 値及びCo値を効果的に
低減し得ることがこのグラフからわかる。In addition, in FIG. 7, the combustion amount on the primary fuel gas side (the combustion amount of the mixed gas from the flame port (6)) in the above combustion mode is 11500 Kcal /
hr and the combustion amount on the secondary fuel gas side (combustion amount of the lean mixed gas from the discharge port (12)) was 18500 Kcal / hr, the total excess air ratio (that is, from the flame port (6) Change the excess air ratio of the mixed gas and the excess air ratio of the lean mixed gas from the discharge port (12) by the proportional distribution of the ratio of the jet amount of the mixed gas and the jet amount of the lean mixed gas). 2 is a graph showing the NOx value (solid line) and the Co value (dashed line) in the case of a stable combustion of the lean mixed gas from the discharge port (12) by the flame holding effect of the flame of the mixed gas from the flame port (6). It can be seen from this graph that the NOx value and Co value can be effectively reduced by setting the above-mentioned total excess air ratio to an appropriate value in the aforementioned combustion mode.
〔別実施例〕 燃料ガス供給装置(B) と、運転制御についての別形
態を示す。つまり、第８図に示すように、燃料ガス供給
系路に、遮断弁(15)、ガバナ(16)及び比例弁(19)を介装
するとともに、第２系路(18)に電磁弁(21)を介装して、
第９図で示すように、一次燃料ガス及び二次燃料ガスの
噴出量を制御する。ここでは電磁弁(21)と二次燃料ガス
供給管(14)と第２系路(18)が、吐出口(12)から燃焼用空
気を噴出する状態と比較混合ガスを噴出する状態とに切
換える手段を構成している。又、図示した以外の供給装
置(B) を構成してもよい。[Other embodiment] Another embodiment of the fuel gas supply device (B) and the operation control is shown. That is, as shown in FIG. 8, a shutoff valve (15), a governor (16) and a proportional valve (19) are provided in the fuel gas supply system passage, and a solenoid valve (18) is provided in the second passage (18). 21)
As shown in FIG. 9, the ejection amounts of the primary fuel gas and the secondary fuel gas are controlled. Here, the solenoid valve (21), the secondary fuel gas supply pipe (14) and the second system passage (18) are in a state of ejecting combustion air from the discharge port (12) and a state of ejecting a comparative mixed gas. It constitutes the switching means. Further, a supply device (B) other than the one shown in the figure may be configured.
前記希薄混合ガスを噴出するタイミングを設定する
為のセンサとしては、火炎が吐出口(12)上端に到達した
ことを検出する視覚センサ、又は、温度センサを用いれ
ばよく、又、比例弁(19)の開度情報に基づき火炎が吐出
口(12)の上端に到達したことを判定させてもよく、使用
状況等に応じて適当なセンサを使用すればよい。As a sensor for setting the timing of jetting the lean mixed gas, a visual sensor for detecting that the flame has reached the upper end of the discharge port (12), or a temperature sensor may be used, and a proportional valve (19 It is also possible to determine that the flame has reached the upper end of the discharge port (12) based on the opening degree information of), and an appropriate sensor may be used according to the usage situation and the like.
一次及び二次燃料ガスとしては、天然ガス、プロパ
ンガス等を利用できる。又、二次燃料ガスについては難
燃性の低級ガスを利用することもできる。Natural gas, propane gas or the like can be used as the primary and secondary fuel gases. Further, as the secondary fuel gas, a flame-retardant low-grade gas can be used.
炎口(6) の個数、配置、形状は適当に変更でき、炎
口(6) 群を１列に配置して壁体(3)を１個だけにした
り、半円状の炎口にしてもよい。The number, arrangement, and shape of the flame mouths (6) can be changed as appropriate, and the flame mouths (6) group are arranged in one row to have only one wall body (3) or a semicircular flame mouth. Good.
燃焼面形成用壁体(3),(4) の形状は適宜変更自在で
あり、鉛直姿勢であってもよい。The shapes of the combustion surface forming walls (3) and (4) can be appropriately changed and may be in a vertical posture.
バーナ部は一つでも、複数でもよく、設置個数に制
限はない。There may be one burner unit or a plurality of burner units, and the number of installed burners is not limited.
前記吐出口(12)の設置個数、形状等は適宜選択して
もよい。The number of installed discharge ports (12), the shape, etc., may be appropriately selected.
バーナの形態としては燃焼面形成用壁体を形成する
ことなく、前記吐出口(12)と炎口(6)とをつながりなく
形成したものであってもよい。The form of the burner may be such that the discharge port (12) and the flame port (6) are not connected to each other without forming the combustion surface forming wall body.
尚、特許請求の範囲の項に図面との対照を便利にする為
に符号を記すが、該記入により本発明は添付図面の構造
に限定されるものではない。It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.
図面は本発明に係るガスバーナの実施例を示し、第１図
は全体縦断正面図、第２図はインプットが小さい状態で
の火炎の状態を示す縦断正面図、第３図は火炎が吐出口
上端に至った状態を示す縦断正面図、第４図は一部切欠
全体側面図、第５図は燃料ガス供給装置を示す構成図、
第６図は二次燃料ガスの噴出タイミングを示すグラフ、
第７図はNOx の発生状態を示すグラフ、第８図は燃料ガ
ス供給装置の別実施例を示す構成図、第９図は第８図に
おける燃料ガス供給装置での二次燃料ガスの噴出タイミ
ングを示すグラフである。 (6)……炎口、(12)……吐出口、 (14),(18),(20),(21)……切換手段。The drawings show an embodiment of a gas burner according to the present invention. Fig. 1 is an overall vertical front view, Fig. 2 is a vertical front view showing a state of a flame when the input is small, and Fig. 3 is a flame top end of a discharge port. FIG. 4 is a partially cutaway overall side view of the fuel gas supply device, FIG.
FIG. 6 is a graph showing the injection timing of the secondary fuel gas,
FIG. 7 is a graph showing the NOx generation state, FIG. 8 is a configuration diagram showing another embodiment of the fuel gas supply device, and FIG. 9 is a timing of secondary fuel gas injection in the fuel gas supply device in FIG. It is a graph which shows. (6) ...... flame port, (12) ... discharge port, (14), (18), (20), (21) ... switching means.
Claims (1)
スを噴出する複数の炎口(6) を並設し、これら炎口(6)
より噴出する混合ガスによって燃焼する火炎の隣接する
ものの間に燃焼用二次空気を噴出する複数の吐出口(12)
を形成してあるガスバーナであって、 前記吐出口(12)から前記燃焼用二次空気を噴出する状態
と前記炎口(6) より噴出する混合ガスよりも希薄な希薄
混合ガスを噴出する状態とに切換える手段(14),(18),(2
0),(21) を設けてあるガスバーナ。1. A plurality of flame ports (6) for ejecting a mixed gas of a mixture of gas fuel and combustion air are arranged in parallel, and these flame ports (6) are arranged.
Multiple discharge ports (12) that eject secondary combustion air between adjacent flames that are burned by more mixed gas
A gas burner that forms a state in which the secondary air for combustion is ejected from the discharge port (12) and a lean mixed gas that is leaner than the mixed gas ejected from the flame port (6) is ejected Means to switch to (14), (18), (2
Gas burner provided with (0) and (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2046644A JPH0627569B2 (en) | 1990-02-26 | 1990-02-26 | Gas burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2046644A JPH0627569B2 (en) | 1990-02-26 | 1990-02-26 | Gas burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03247907A JPH03247907A (en) | 1991-11-06 |
| JPH0627569B2 true JPH0627569B2 (en) | 1994-04-13 |
Family
ID=12753019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2046644A Expired - Fee Related JPH0627569B2 (en) | 1990-02-26 | 1990-02-26 | Gas burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0627569B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0670487B2 (en) * | 1990-03-14 | 1994-09-07 | リンナイ株式会社 | Low nitrogen oxide burner |
| JP2578454Y2 (en) * | 1992-06-04 | 1998-08-13 | 大阪瓦斯株式会社 | Burner |
| JP2622482B2 (en) * | 1992-11-24 | 1997-06-18 | リンナイ株式会社 | Combustor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03217704A (en) * | 1990-01-24 | 1991-09-25 | Rinnai Corp | Combustion method for combustion device |
-
1990
- 1990-02-26 JP JP2046644A patent/JPH0627569B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03247907A (en) | 1991-11-06 |
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