JP2812549B2 - Low NOx burner - Google Patents
Low NOx burnerInfo
- Publication number
- JP2812549B2 JP2812549B2 JP27744690A JP27744690A JP2812549B2 JP 2812549 B2 JP2812549 B2 JP 2812549B2 JP 27744690 A JP27744690 A JP 27744690A JP 27744690 A JP27744690 A JP 27744690A JP 2812549 B2 JP2812549 B2 JP 2812549B2
- Authority
- JP
- Japan
- Prior art keywords
- air
- fuel mixture
- flame
- burner
- mixture
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 産業上の利用分野 本発明はブンゼン式の低NOxバーナに関するものであ
る。Description: TECHNICAL FIELD The present invention relates to a Bunsen type low NOx burner.
従来の技術 従来の家庭用のブンゼン式低NOxバーナとしては例え
ば第３図に示すように、第一の炎口部１を有するバーナ
本体２に設けた第一の混合気室３と、前記第一の混合気
室３の両側に設けた第二の炎口部４を有する第二の混合
気室５と、前記第一の混合気室３とを前記第二の混合気
室５とを連通すべくバーナ本体２に設けた混合気通路６
と、前記第二の混合気室５の底部に形成され第二の混合
気室５の１次空気比を設定する空気入れ口７とを備えた
ものが知られている。このような構成において、第二の
炎口部４より噴出される未燃焼の酸素濃度の低い混合気
を第一の炎口部１上に形成される火炎に供給すること
で、燃焼を緩慢にし、火炎温度を低下させ、サーマルNO
xの発生を低減しようとしていた。2. Description of the Related Art As a conventional household Bunsen type low NOx burner, for example, as shown in FIG. 3, a first air-fuel mixture chamber 3 provided in a burner main body 2 having a first flame port 1 and A second mixture chamber 5 having second flame ports 4 provided on both sides of one mixture chamber 3 and the first mixture chamber 3 are connected to the second mixture chamber 5. A mixture passage 6 provided in the burner body 2 to pass through
And an air inlet 7 formed at the bottom of the second mixture chamber 5 to set the primary air ratio of the second mixture chamber 5 is known. In such a configuration, the combustion is slowed down by supplying the unburned mixture having a low oxygen concentration ejected from the second flame port 4 to the flame formed on the first flame port 1. Reduces flame temperature, thermal NO
I was trying to reduce the occurrence of x.
発明が解決しようとする課題 しかしながら上記のような構成では、第一の炎口部１
に形成される火炎より第二の混合気室５の混合気を介し
て混合気通路６に火炎が移るなどの問題を有していた。Problems to be Solved by the Invention However, in the above configuration, the first flame port 1
There is a problem that the flame is transferred to the mixture passage 6 from the flame formed in the second mixture chamber 5 through the mixture in the second mixture chamber 5.
本発明はこのような課題を解決するもので、不必要な
火移りを防ぎ、NOxの発生を低減させるようにすること
を目的とするものである。The present invention solves such a problem, and an object of the present invention is to prevent unnecessary fires and reduce the generation of NOx.
課題を解決するための手段 上記課題を解決するために本発明の低NOxバーナは、
第一の炎口部を有するバーナ本体に設けた第一の混合気
室と、バーナ本体の外側面に取り付けられた側板とバー
ナ本体外側面との間に形成され上端に第二の炎口部を有
する第二の混合気室と、前記側板と前記バーナ本体の間
の第二の混合気室内に設けられ混合気を冷却させる冷却
板と、前記第一の混合気室と前記第二の混合気室とを連
通する前記バーナ本体に設けた混合気通路と、前記第二
の混合気質に設けられた前記第二の混合気質の１次空気
比を設定する空気取入れ口とを備えてなるものである。Means for Solving the Problems To solve the above problems, the low NOx burner of the present invention is:
A first mixture chamber provided in a burner body having a first flame port, and a second flame port formed at an upper end formed between a side plate attached to an outer surface of the burner body and an outer surface of the burner body. A second air-fuel mixture chamber, a cooling plate provided in the second air-fuel mixture chamber between the side plate and the burner main body to cool the air-fuel mixture, the first air-fuel mixture chamber and the second mixing A mixture passage provided in the burner body communicating with the air chamber, and an air intake provided in the second mixture to set a primary air ratio of the second mixture. It is.
作用 本発明は上記した構成によつて、第二の混合気室内を
流れる混合気を冷却板により冷却しながら第二の炎口部
へと導く。第二の混合気室の混合気は冷却されることで
従来に比べ着火温度が低くなるので、混合気通路への火
移りはない。よつて第二の混合気室の混合気を大気中の
酸素濃度より低い混合気として第一の炎口部上に形成さ
れる火炎に第二の炎口部より供給することで、燃焼を緩
慢化し、火災温度を低温化させている。According to the present invention, the air-fuel mixture flowing in the second air-fuel mixture chamber is guided to the second flame port while being cooled by the cooling plate. Since the ignition temperature of the air-fuel mixture in the second air-fuel mixture chamber is lower than that of the conventional air-fuel mixture, there is no fire in the air-fuel mixture passage. Therefore, the combustion in the second mixture chamber is slowed down by supplying the mixture formed in the second mixture chamber to the flame formed on the first flame port as a mixture having a concentration lower than the oxygen concentration in the atmosphere from the second flame port. And the fire temperature is lowered.
実施例 以下、本発明の一実施例について、図面に基づいて説
明する。Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
第１図および第２図において、11はバーナ本体であ
り、内部に第一の混合気室23を備え、このバーナ本体11
の上面には多数のスリット状に開口した第一の炎口部12
が形成されている。また、バーナ本体11の両側面には混
合気通路13が長手方向に適当間隔で設けられ、さらにバ
ーナ本体11の両側の外側面にはバーナ本体11の外側面と
の間で第二の混合気室14を形成する側板15が取り付けら
れている。前記側板15の上端部16とバーナ本体11の上端
部17との間には第二の炎口部18が形成されている。側板
15の下端部19および水平方向両端はバーナ本体11に固定
され、この側板15には下端部より上向きの傾斜部20と、
この傾斜部20の上端につながつてバーナ本体11の外側面
と平行な平行部21を備え、前記傾斜部20には空気取入れ
口22がバーナ本体11の長手方向に適当間隔で設けらてい
る。さらに、前記第二の混合気室14の内部にはそれぞれ
前記バーナ本体11の外側面および側板15の平行部21と平
行で、これらバーナ本体11の外側面および側板15の平行
部21に対して等間隔おきに２枚の冷却板24が設けられて
おり、この冷却板24の上端はバーナ本体11の上端部17お
よび側板15の上端部16と同じ高さに位置するように構成
されている。In FIGS. 1 and 2, reference numeral 11 denotes a burner main body, which includes a first air-fuel mixture chamber 23 therein.
On the upper surface of the first flame opening 12 opened in a number of slits
Are formed. Air-fuel mixture passages 13 are provided on both side surfaces of the burner main body 11 at appropriate intervals in the longitudinal direction, and a second air-fuel mixture passage is provided on both outer side surfaces of the burner main body 11 between the burner main body 11 and the outer side surface thereof. A side plate 15 forming the chamber 14 is attached. A second flame port 18 is formed between an upper end 16 of the side plate 15 and an upper end 17 of the burner main body 11. Side plate
The lower end portion 19 and both ends in the horizontal direction of 15 are fixed to the burner main body 11, and the side plate 15 has an inclined portion 20 upward from the lower end portion,
A parallel portion 21 connected to the upper end of the inclined portion 20 and parallel to the outer surface of the burner main body 11 is provided. The inclined portion 20 is provided with air intake ports 22 at appropriate intervals in the longitudinal direction of the burner main body 11. Further, the inside of the second air-fuel mixture chamber 14 is parallel to the outer surface of the burner main body 11 and the parallel portion 21 of the side plate 15, respectively, with respect to the outer surface of the burner main body 11 and the parallel portion 21 of the side plate 15. Two cooling plates 24 are provided at equal intervals, and the upper end of the cooling plate 24 is configured to be positioned at the same height as the upper end 17 of the burner main body 11 and the upper end 16 of the side plate 15. .
ここで火炎より発生するNOxの発生原理について説明
する。火炎より発生するNOxは一般にフユーエルNOxとサ
ーマルNOxがあり、フユーエルNOxは燃料の種類によつて
その発生量が決まる。サーマルNOxは火炎反応帯を通過
するときに空気中のN2が反応してできたNOxであり、そ
の発生量は火炎反応帯の温度によつて決まる。なお、サ
ーマルNOxは火災反応温度が低温であるほど発生量は減
少する。よつて火炎を低酸素濃度雰囲気中で燃焼させる
と反応が緩慢になり、また火炎反応帯が大きくなるので
単位火炎反応帯当りの発熱量が減少することになる。こ
のような理由で火炎反応帯温度は低下し、低NOx化が図
れるのである。Here, the generation principle of NOx generated from the flame will be described. NOx generated from a flame generally includes fuel NOx and thermal NOx, and the amount of fuel NOx generated is determined by the type of fuel. Thermal NOx is NOx to N 2 in the air is Deki react as it passes through the flame reaction zone, the amount of generated by connexion determined temperature of the flame reaction zone. The amount of thermal NOx generated decreases as the fire reaction temperature decreases. Therefore, when the flame is burned in a low oxygen concentration atmosphere, the reaction becomes slow and the flame reaction zone becomes large, so that the calorific value per unit flame reaction zone decreases. For this reason, the temperature of the flame reaction zone decreases, and NOx can be reduced.
本実施例のバーナの燃焼方式では第二の炎口部18より
噴出され未燃焼でかつ大気中の酸素濃度より低い混合気
を第一の炎口部12上に形成される火炎に供給すること
で、バーナ本体11に形成される火炎の燃焼反応を緩慢化
し、火災温度を低温化させ、サーマルNOxの発生を低減
させるものである。In the burner combustion method of the present embodiment, an air-fuel mixture ejected from the second flame port 18 and being unburned and lower than the oxygen concentration in the atmosphere is supplied to the flame formed on the first flame port 12. Thus, the combustion reaction of the flame formed in the burner main body 11 is slowed down, the fire temperature is lowered, and the generation of thermal NOx is reduced.
上記構成において、第一の混合気室23内部の混合気は
１次空気比を30から60％に設定している。この混合気の
一部は第一の炎口部12より噴出し、残りの混合気は混合
気通路13を通り、第二の混合気室14に導かれた後、空気
取入れ口22から入つた空気と混合し、１枚空気比を170
から250％程度とし且つ燃焼可燃限界以下の混合気とな
つて各冷却板24に沿つて流れて第二の炎口部18より噴出
する。二次空気は隣接するバーナ間を下部より上部へと
流れ、その一部は空気取入れ口22より第二の混合気室14
に流入し、残りは側板15の外周に沿つて流れる。第二の
混合気室14の混合気は平均的には燃焼可燃限界以下に設
定されているが、局部的に見れば混合気通路13の付近は
燃焼可燃域にあるので、第一の炎口部12の火災より混合
気通路13に火移りする場合がある。しかし冷却板24によ
つて第二の混合気室14を細分化し、混合気の温度を低下
させることで混合気通路13への火移りを防ぐものであ
る。また、複数の冷却板24により第二の混合気室14の通
路を消炎距離以下に小さくすることで混合気通路13への
火移りを、防止できる。よつて、第二の混合気室14への
不必要な火移りを防ぎ、上記本来の燃焼方式によりNOx
の発生を低減させるものである。In the above configuration, the air-fuel mixture inside the first air-fuel mixture chamber 23 has a primary air ratio set to 30 to 60%. A part of this air-fuel mixture was blown out from the first flame port 12, and the remaining air-fuel mixture passed through the air-fuel mixture passage 13, was led to the second air-fuel mixture chamber 14, and then entered through the air intake 22. Mix with air and set the air ratio to 170
From about 250% to a mixture below the combustion flammability limit, flows along each cooling plate 24, and is ejected from the second flame port 18. The secondary air flows between the adjacent burners from the lower part to the upper part, and a part of the secondary air flows from the air intake 22 to the second mixture chamber 14.
And the rest flows along the outer periphery of the side plate 15. The air-fuel mixture in the second air-fuel mixture chamber 14 is, on average, set to the combustion flammability limit or less. There is a case where a fire of the part 12 causes a fire to the mixture passage 13. However, the second air-fuel mixture chamber 14 is subdivided by the cooling plate 24 to reduce the temperature of the air-fuel mixture, thereby preventing a fire from being transferred to the air-fuel mixture passage 13. In addition, by making the passage of the second mixture chamber 14 smaller than the quenching distance by the plurality of cooling plates 24, it is possible to prevent the fire from flowing into the mixture passage 13. Therefore, unnecessary fire transfer to the second air-fuel mixture chamber 14 is prevented, and NOx is
Is to reduce the occurrence of.
また、側板15の外側を流れる空気は第二の炎口部18の
二次空気として供給された後、第一の炎口部12の二次空
気として作用し、第二の炎口部18より噴出される混合気
を包囲するので、バーナに形成される火炎は完全燃焼し
未燃焼ガスの発生を防止する。In addition, after the air flowing outside the side plate 15 is supplied as the secondary air of the second flame port 18, it acts as the secondary air of the first flame port 12, and from the second flame port 18. Since it surrounds the air-fuel mixture to be jetted, the flame formed in the burner is completely burned to prevent the generation of unburned gas.
さらに、第二の混合気室14の混合気を冷却板24によつ
て整流することで、第一の炎口部12の火炎を安定化で
き、燃焼音を低減することができる。Further, by rectifying the air-fuel mixture in the second air-fuel mixture chamber 14 by the cooling plate 24, the flame in the first flame opening 12 can be stabilized, and the combustion noise can be reduced.
発明の効果 以上のように本発明の低NOxバーナによれば次の効果
が得られる。Effects of the Invention As described above, according to the low NOx burner of the present invention, the following effects can be obtained.
（１）第二の混合気室の混合気を冷却させることによつ
て、第二の混合気室内への不必要な火移りを防ぎ、第二
の炎口部より噴出される未燃焼の低酸素濃度の混合気を
第一の炎口部上に形成される火炎に供給し火炎温度を低
下することでNOxの発生を低減する本来の燃焼方式が実
現できる。(1) By cooling the air-fuel mixture in the second air-fuel mixture chamber, unnecessary fire transfer into the second air-fuel mixture chamber is prevented, and the unburned low-pressure fuel blown out from the second flame port is discharged. By supplying a mixture having an oxygen concentration to the flame formed on the first flame port, the flame temperature is lowered, thereby realizing the original combustion method of reducing the generation of NOx.
（２）さらにバーナの周囲を流れる二次空気が第二の炎
口部より噴出される混合気を包囲して完全燃焼させるの
で未燃焼ガスが発生することがない。(2) Further, since the secondary air flowing around the burner surrounds the air-fuel mixture injected from the second flame port and completely burns, no unburned gas is generated.
（３）第二の混合気室の混合気を冷却板によつて整流す
ることで火炎を安定化し、燃焼音を低減できる。(3) By rectifying the air-fuel mixture in the second air-fuel mixture chamber by the cooling plate, the flame can be stabilized and the combustion noise can be reduced.
第１図は本発明の一実施例における低NOxバーナの断面
斜視図、第２図は同バーナの断面図、第３図は従来の低
NOxバーナの断面斜視図である。 11……バーナ本体、12……第一の炎口部、13……混合気
通路、14……第二の混合気室、15……側板、16,17……
上端部、18……第二の炎口部、19……下端部、20……傾
斜部、21……平行部、22……空気取入れ口、23……第一
の混合気室、24……冷却板。1 is a sectional perspective view of a low NOx burner according to an embodiment of the present invention, FIG. 2 is a sectional view of the burner, and FIG.
It is a sectional perspective view of a NOx burner. 11 ... burner body, 12 ... first flame outlet, 13 ... mixture passage, 14 ... second mixture chamber, 15 ... side plate, 16, 17 ...
Upper end portion, 18 second flame outlet portion, 19 lower end portion, 20 inclined portion, 21 parallel portion, 22 air intake port, 23 first mixture chamber, 24 ... cooling plate.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−219406（ＪＰ，Ａ) 特開 昭63−201415（ＪＰ，Ａ) 実開 昭64−8025（ＪＰ，Ｕ) 実開 昭64−8024（ＪＰ，Ｕ) 実開 昭59−108023（ＪＰ，Ｕ) 実開 昭60−76716（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) F23D 14/02 F23D 14/08 F23D 14/62 F23D 14/84 F23C 11/00──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-219406 (JP, A) JP-A-63-201415 (JP, A) JP-A 64-8025 (JP, U) JP-A 64- 8024 (JP, U) Fully open sho 59-108023 (JP, U) Fully open sho 60-76716 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) F23D 14/02 F23D 14 / 08 F23D 14/62 F23D 14/84 F23C 11/00
Claims (1)
第一の混合気室と、バーナ本体の外側面に取り付けられ
た側板とバーナ本体外側面との間に形成され上端に第二
の炎口部を有する第二の混合気室と、前記側板と前記バ
ーナ本体の間の第二の混合気室内に設けられ混合気を冷
却させる冷却板と、前記第一の混合気室と前記第二の混
合気室とを連通する前記バーナ本体に設けた混合気通路
と、前記第二の混合気質に設けられ前記第二の混合気室
の１次空気比を設定する空気取入れ口とを備えてなる低
NOxバーナ。1. A first mixture chamber provided in a burner main body having a first flame opening, and a side plate attached to an outer surface of the burner main body and a burner main body outer surface formed at a top end thereof. A second mixture chamber having two flame openings, a cooling plate provided in the second mixture chamber between the side plate and the burner body to cool the mixture, and the first mixture chamber; An air-fuel mixture passage provided in the burner body communicating with the second air-fuel mixture chamber; an air intake port provided in the second air-fuel mixture to set a primary air ratio of the second air-fuel mixture chamber; Be equipped with low
NOx burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27744690A JP2812549B2 (en) | 1990-10-16 | 1990-10-16 | Low NOx burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27744690A JP2812549B2 (en) | 1990-10-16 | 1990-10-16 | Low NOx burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04151416A JPH04151416A (en) | 1992-05-25 |
| JP2812549B2 true JP2812549B2 (en) | 1998-10-22 |
Family
ID=17583689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27744690A Expired - Lifetime JP2812549B2 (en) | 1990-10-16 | 1990-10-16 | Low NOx burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2812549B2 (en) |
-
1990
- 1990-10-16 JP JP27744690A patent/JP2812549B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04151416A (en) | 1992-05-25 |
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