JPH081283B2 - Combustion device - Google Patents
Combustion deviceInfo
- Publication number
- JPH081283B2 JPH081283B2 JP60134508A JP13450885A JPH081283B2 JP H081283 B2 JPH081283 B2 JP H081283B2 JP 60134508 A JP60134508 A JP 60134508A JP 13450885 A JP13450885 A JP 13450885A JP H081283 B2 JPH081283 B2 JP H081283B2
- Authority
- JP
- Japan
- Prior art keywords
- combustion chamber
- primary
- air
- combustion
- flame
- 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
- 238000002485 combustion reaction Methods 0.000 title claims description 47
- 238000001816 cooling Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000000567 combustion gas Substances 0.000 description 10
- 239000000446 fuel Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、加熱装置、暖房装置などに利用出来る燃焼
装置に係わり、特に２段燃焼により窒素酸化物（以下NO
xと称す）の排出量を低減した燃焼装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device that can be used as a heating device, a heating device, and the like.
( referred to as “ x” ).
従来の技術 従来のこの種の装置には次のようなものがあった。す
なわち、第２図、第３図に示す様に、バーナ１とこの上
部に設けた１次燃焼室２とを２次燃焼室３の中に設けて
あり、バーナ１は混合気室５と炎孔部６より成りこの炎
孔部６には多数の炎孔８が垂直方向に開口していて、混
合気室５を経て供給される空気比が0.6〜0.9程度の混合
気がこの炎孔８から噴出され１次炎が形成される。しか
し、１次燃焼室２において１段目の燃焼が行なわれるが
空気不足であるため不完全燃焼によりCO,H2を主成分と
する未燃ガスが生じる。この未燃ガスは１次燃焼室の上
部に設けた２次炎孔部７において間隙４より供給される
２次空気により２次炎を形成して２段目の燃焼が行なわ
れ、燃焼を完結するものがあった。（例えば、特公昭56
−32524号公報） 発明が解決しようとする問題点 しかしながら上記のような構成では、次のような欠点
があった。2. Description of the Related Art Conventional devices of this type include the following. That is, as shown in FIGS. 2 and 3, a burner 1 and a primary combustion chamber 2 provided above the burner 1 are provided in a secondary combustion chamber 3, and the burner 1 includes a mixture chamber 5 and a flame. A large number of flame holes 8 are formed in this flame hole portion 6 in the vertical direction, and the air-fuel mixture supplied through the air-fuel mixture chamber 5 has a ratio of about 0.6 to 0.9. It is ejected from and a primary flame is formed. However, the first stage combustion is performed in the primary combustion chamber 2, but the air is insufficient, so that incomplete combustion produces unburned gas containing CO and H 2 as main components. The unburned gas forms a secondary flame in the secondary flame hole 7 provided in the upper part of the primary combustion chamber by the secondary air supplied from the gap 4, and the second stage combustion is performed to complete the combustion. There was something to do. (For example, Japanese Patent Publication Sho 56
-32524 gazette) Problem to be solved by the invention However, the above-mentioned configuration has the following drawbacks.
つまり、２段燃焼法では１次燃焼室において酸素不足の
状態（つまり空気比１以下の燃料過剰の状態）で燃焼さ
せＮの酸化によるNOxの生成を抑制するとともにこの際
生じる燃焼ガスの温度を低下させることにより２段目で
のNOxの低減を図る事ができる。すなわち、一般的にNOx
の主成分であるNO生成は次式によって記述され、 〔NO〕＝Ｃ（C1/T）〔N2〕〔O2〕ｔ 〔NO〕燃焼ガス中のNO濃度 〔N2〕燃焼ガス中のＮ濃度 〔O2〕燃焼ガス中のＯ濃度 C,C1 定数 Ｔ 燃焼ガスの温度 ｔ 滞留時間 NOの生成量のほとんどが燃焼ガスの温度Ｔによって決
定されることが明らかになっている。That is, in the two-stage combustion method, combustion is performed in the primary combustion chamber in an oxygen-deficient state (that is, in an excess fuel state with an air ratio of 1 or less) to suppress the generation of NO x due to the oxidation of N, and the temperature of the combustion gas generated at this time. It is possible to reduce NO x in the second stage by decreasing That is, generally NO x
The main component is NO generation is described by the following equation, [NO] = C (C1 / T) [N 2] [O 2] t [NO] NO concentration in the combustion gas [N 2] in the combustion gas N concentration [O 2 ] O concentration in combustion gas C, C1 constant T combustion gas temperature t residence time NO It has been clarified that most of the production amount of NO is determined by the combustion gas temperature T.
燃焼ガスの温度は主に１次燃焼室１の壁面から間隙４
を流れる２次空気への放熱によって行なわれるため１次
炎からこの壁面への熱伝達量によってその低減度が決っ
てしまう。しかし、上記構成では１次燃焼室２の壁面の
面積によって熱伝達量がきまってしまうため自と低NOx
化に限界があった。このため、１次燃焼室を大きくして
伝熱面積を確保する必要があった。しかし、１次燃焼室
の拡大は同時に変形しやすいといういう欠点があり、補
強を必要とするため構成が複雑になるばかりでなく製造
コストの上昇を招くという欠点もあった。The temperature of the combustion gas is mainly from the wall surface of the primary combustion chamber 1 to the gap 4
Since it is carried out by radiating heat to the secondary air flowing through it, the degree of reduction is determined by the amount of heat transfer from the primary flame to this wall surface. However, in the above configuration, the amount of heat transfer varies depending on the surface area of the wall surface of the primary combustion chamber 2, so low NO x
There was a limit to the conversion. Therefore, it is necessary to enlarge the primary combustion chamber to secure the heat transfer area. However, the expansion of the primary combustion chamber has a drawback that it is easily deformed at the same time, and since it requires reinforcement, it has a drawback that not only the structure becomes complicated but also the manufacturing cost increases.
本発明はかかる点に鑑みてなされたもので、１次炎を
直接冷却してNOxを低減するものである。The present invention has been made in view of the above point, and directly cools the primary flame to reduce NO x .
問題点を解決するための手段 上記問題点を解決する技術的な手段は、１次燃焼室を
貫通させて冷却管を設け、１次炎を直接冷却するもので
ある。Means for Solving Problems The technical means for solving the above problems is to provide a cooling pipe through the primary combustion chamber to directly cool the primary flame.
作用 この技術的な手段による作用は、次のようになる。す
なわち、冷却管の中を空気等の流体が流れ、１次炎は直
接冷却される。この結果、１次燃焼室内で生じた１次炎
（つまり未燃ガス）の温度は十分に低下しNOxの低減を
可能とするものである。Action The action of this technical means is as follows. That is, a fluid such as air flows in the cooling pipe and the primary flame is directly cooled. As a result, the temperature of the primary flame (that is, unburned gas) generated in the primary combustion chamber is sufficiently lowered, and NO x can be reduced.
実施例 以下本発明を温風暖房機に応用した実施例を添付図面
にもとづいて説明する。第１図において、１はバーナで
あり、混合気室は断面が円状でこの上に炎孔部６があ
り、この炎孔部６の両側面にスリット状の炎孔８が多数
設けられている。バーナ１は１次燃焼室２の下部に設け
てある。さらに、この１次燃焼室２は２次燃焼室３と案
内板10によって間隙４を隔てて囲まれている。また、１
次燃焼室２を貫通しさらに２次燃焼室３と案内板10をも
貫通する冷却管11がバーナ１の上部にもうけてあり、そ
の両端は冷却空気取り入れ口12と冷却空気出口13として
開口させている。以上がこの温風暖房機の燃焼部を構成
し、この燃焼部の下部に温風ファン14が設けてあり、15
は空気吸い込み口であり、16が温風吹き出し口になって
いる。Embodiments Embodiments in which the present invention is applied to a warm air heater will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 is a burner, the mixture chamber has a circular cross section, and a flame hole portion 6 is formed thereon, and a large number of slit flame holes 8 are provided on both side surfaces of the flame hole portion 6. There is. The burner 1 is provided below the primary combustion chamber 2. Further, the primary combustion chamber 2 is surrounded by the secondary combustion chamber 3 and the guide plate 10 with a gap 4 therebetween. Also, 1
A cooling pipe 11 penetrating the secondary combustion chamber 2 and also penetrating the secondary combustion chamber 3 and the guide plate 10 is provided in the upper part of the burner 1, and both ends thereof are opened as a cooling air intake 12 and a cooling air outlet 13. ing. The above constitutes the combustion section of this warm air heater, and the warm air fan 14 is provided below this combustion section.
Is an air inlet, and 16 is a hot air outlet.
次に、この一実施例の構成における作用を説明する。 Next, the operation of the configuration of this embodiment will be described.
まず、混合気室５から供給される燃料と空気の混合気
は炎孔部６から各炎孔８において燃焼を開始しその火炎
は１次燃焼室２の内壁面に衝突し、流れ方向を上向きに
変えられて１次燃焼室の上部へと向かう。この間燃焼反
応は酸素不足のため不完全ながら行なわれ、燃焼ガスが
（未燃ガス）生成される。この燃焼ガスは２次炎孔部７
の近傍で空気吸い込み口15から間隙４を経て流入する２
次空気の供給を受けさらに２次燃焼室３と案内板10によ
って構成される空間で２次燃焼をし燃焼を完結する。First, a mixture of fuel and air supplied from the air-fuel mixture chamber 5 starts to burn from the flame hole portion 6 in each flame hole 8, and the flame collides with the inner wall surface of the primary combustion chamber 2 and flows upward. Is turned to the upper part of the primary combustion chamber. During this period, the combustion reaction is performed incompletely due to lack of oxygen, and combustion gas (unburned gas) is generated. This combustion gas is the secondary flame hole 7
Flows in from the air intake port 15 through the gap 4 in the vicinity of 2
Upon receiving the supply of the secondary air, secondary combustion is further performed in the space formed by the secondary combustion chamber 3 and the guide plate 10 to complete the combustion.
一方、温風ファン14によって冷却空気取り入れ口12か
ら吸引された空気は冷却管11内で１次炎の熱を奪い冷却
空気出口13から温風路へ流れ燃焼ガス（完全燃焼後の排
気ガス）と混合される。この混合気は温風ファン12によ
って温風暖房機の下部に導かれ温風となって温風吹き出
し口16より吹き出される。この実施例では、１次燃焼室
の冷却空気取り入れ口12から吸引された空気は冷却管11
内で熱伝達によって１次炎の温度を低下させる。この結
果、１次炎でのNOxの生成量を低下させることができ
る。On the other hand, the air sucked from the cooling air intake port 12 by the warm air fan 14 takes the heat of the primary flame in the cooling pipe 11 and flows from the cooling air outlet 13 to the warm air passage combustion gas (exhaust gas after complete combustion) Mixed with. The air-fuel mixture is guided to the lower part of the warm-air heater by the warm-air fan 12, becomes warm air, and is blown out from the warm-air outlet 16. In this embodiment, the air sucked from the cooling air intake 12 of the primary combustion chamber is cooled by the cooling pipe 11.
The temperature of the primary flame is reduced by heat transfer within. As a result, the amount of NO x produced in the primary flame can be reduced.
また、本実施例では冷却管内に強制的に空気を導いて
いるが、他の実施例として（図示していないが）、冷却
管を傾斜させて設けることにより、空気の自然ドラフト
が生じて本実施例と同様の効果が得られる。Further, in this embodiment, the air is forcibly guided into the cooling pipe, but as another embodiment (not shown), by providing the cooling pipe in a tilted manner, a natural draft of air is generated and The same effect as the embodiment can be obtained.
発明の効果 以上のように本発明の燃焼装置によれば、つぎの効果
が得られる。Effects of the Invention As described above, according to the combustion device of the present invention, the following effects are obtained.
（１）１次燃焼室に冷却管を設けることにより熱伝達に
よって１次炎の温度を低下できるので、１次炎でのNOx
の生成量が低下し、さらに結果的に次の２次燃焼におい
てもNOxの生成量が低下できる。(1) Since the temperature of the primary flame can be lowered by heat transfer by providing a cooling pipe in the primary combustion chamber, NO x in the primary flame can be reduced.
The production amount of NO x is reduced, and as a result, the production amount of NO x can be reduced also in the next secondary combustion.
（２）１次燃焼室に冷却管を設けることにより熱伝達に
よって１次炎の温度を低下できるため、１次燃焼室を拡
大して伝熱面積を増加させる必要がないので、従来に比
べて１次燃焼室を小型化できる。さらに、熱変形防止の
ために特に補強を必要としない。また、製造コストの上
昇も防止できる。(2) Since the temperature of the primary flame can be lowered by heat transfer by providing a cooling pipe in the primary combustion chamber, it is not necessary to enlarge the primary combustion chamber to increase the heat transfer area. The primary combustion chamber can be downsized. Furthermore, no particular reinforcement is required to prevent thermal deformation. Further, it is possible to prevent an increase in manufacturing cost.
第１図は本発明の一実施例である燃焼装置を応用した温
風暖房機を示す横断面図、第２図は従来の燃焼装置の縦
断面図、第３図は同横断面図である。 １……バーナ、２……１次燃焼室、３……２次燃焼室、
５……混合気室、６……炎孔部、７……２次炎孔部、８
……炎孔、９……フィン、11……冷却管。FIG. 1 is a cross-sectional view showing a hot air heater to which a combustion device according to an embodiment of the present invention is applied, FIG. 2 is a vertical cross-sectional view of a conventional combustion device, and FIG. 3 is a cross-sectional view of the same. . 1 ... Burner, 2 ... Primary combustion chamber, 3 ... Secondary combustion chamber,
5 ... Mixture chamber, 6 ... Flame hole, 7 ... Secondary flame hole, 8
…… Flame holes, 9 …… Fins, 11 …… Cooling tubes.
Claims (1)
合する混合気室と前記混合気室の上部に設けた炎孔部と
から成るバーナと、前記バーナを内部に有しかつ上部に
２次炎孔部を設けた１次燃焼室と、前記１次燃焼室の外
壁を間隙を有して囲む２次燃焼室とから成り、前記１次
燃焼室を貫通する冷却管を前記バーナ上部に設けた燃焼
装置。1. A burner comprising a mixture chamber for mixing gas and air so that an air ratio is 1 or less, and a flame hole portion provided in an upper portion of the mixture chamber; and an upper portion having the burner therein. And a secondary combustion chamber surrounding the outer wall of the primary combustion chamber with a gap, and a cooling pipe penetrating the primary combustion chamber is connected to the burner. Combustion device installed at the top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60134508A JPH081283B2 (en) | 1985-06-20 | 1985-06-20 | Combustion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60134508A JPH081283B2 (en) | 1985-06-20 | 1985-06-20 | Combustion device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61291803A JPS61291803A (en) | 1986-12-22 |
| JPH081283B2 true JPH081283B2 (en) | 1996-01-10 |
Family
ID=15129960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60134508A Expired - Lifetime JPH081283B2 (en) | 1985-06-20 | 1985-06-20 | Combustion device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH081283B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59134403A (en) * | 1983-01-20 | 1984-08-02 | Matsushita Electric Ind Co Ltd | Burner device |
| JPS6078247A (en) * | 1983-10-04 | 1985-05-02 | Tokyo Gas Co Ltd | Heat exchange under high intensity combustion while suppressing generation of carbon monoxide and device thereof |
-
1985
- 1985-06-20 JP JP60134508A patent/JPH081283B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61291803A (en) | 1986-12-22 |
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