JP3255395B2 - Combustion equipment - Google Patents
Combustion equipmentInfo
- Publication number
- JP3255395B2 JP3255395B2 JP20378095A JP20378095A JP3255395B2 JP 3255395 B2 JP3255395 B2 JP 3255395B2 JP 20378095 A JP20378095 A JP 20378095A JP 20378095 A JP20378095 A JP 20378095A JP 3255395 B2 JP3255395 B2 JP 3255395B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- combustion
- combustion chamber
- burner
- exhaust gas
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Air Supply (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は燃焼装置に関し、詳しく
は排ガスの一部を再循環つまり排ガスを燃焼系に戻し
て、窒素酸化物の生成を低減する燃焼装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus and, more particularly, to a combustion apparatus that recycles a part of exhaust gas, that is, returns exhaust gas to a combustion system to reduce the generation of nitrogen oxides.
【０００２】[0002]
【従来の技術】従来から、燃焼排ガスの一部を取り出し
て燃焼用空気に混合することで窒素酸化物の生成を抑制
する排ガス再循環法が知られている。例えば、図３に示
すように、給湯器の排気フードＡから給気ファンＢの吸
込口Ｃの近傍に至る排気循環導管Ｄを設け、バーナＥの
燃焼熱により熱交換器Ｆで熱交換された後の燃焼排ガス
の一部を給気ファンＢの吸引力で燃焼用空気に混合する
ものが知られている。こうした排ガス再循環法を用いる
ことで、燃焼用空気の酸素濃度を低減させてＮ2＋Ｏ2
→２ＮＯの反応を抑制している。また、酸素濃度の減少
により火炎温度を下げて窒素酸化物の生成を抑制してい
る。2. Description of the Related Art Conventionally, there has been known an exhaust gas recirculation method in which a part of a combustion exhaust gas is taken out and mixed with combustion air to suppress generation of nitrogen oxides. For example, as shown in FIG. 3, an exhaust circulation pipe D is provided from the exhaust hood A of the water heater to the vicinity of the suction port C of the air supply fan B, and the heat is exchanged in the heat exchanger F by the combustion heat of the burner E. It is known that a part of the later combustion exhaust gas is mixed with combustion air by the suction force of an air supply fan B. By using such an exhaust gas recirculation method, the oxygen concentration of the combustion air is reduced and N2 + O2
→ The reaction of 2NO is suppressed. Further, the flame temperature is lowered by reducing the oxygen concentration to suppress the generation of nitrogen oxides.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、こうし
た燃焼装置では給気ファンから燃焼排ガスを燃焼用空気
に混合して燃焼室に送るのであるが、燃焼排ガスに含ま
れる成分（水蒸気等）によりバーナ、ガスノズル、ノズ
ル台等が腐食してしまい耐久性に欠けてしまうという問
題が生じていた。本発明の燃焼装置は上記課題を解決
し、排ガス再循環に伴う耐久性の低下を抑制することを
目的とする。However, in such a combustion apparatus, the combustion exhaust gas is mixed from the air supply fan into the combustion air and sent to the combustion chamber. However, the burner, There has been a problem that the gas nozzle, the nozzle base, and the like are corroded and lack durability. An object of the present invention is to solve the above-described problems and suppress a decrease in durability due to exhaust gas recirculation.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決する本発
明の燃焼装置は、燃焼室内に設けられ熱交換器を加熱す
るバーナと、熱交換された後の燃焼排ガスを吸い込み、
排気通路を経由して本体外へ排出することにより上記燃
焼室内を負圧にして燃焼用空気を上記燃焼室内に取入れ
る排気ファンと、上記排気通路の上記排気ファンより下
流側から分岐して設けられ、燃焼排ガスを燃焼室に導く
排気循環導管とを備え、上記排気循環導管の先端部に排
気出口を形成し、該排気出口を燃焼室内のバーナ炎孔よ
り下流側あるいはバーナ炎孔と略同レベル位置としたこ
とを要旨とする。A combustion apparatus according to the present invention for solving the above-mentioned problems is provided with a burner provided in a combustion chamber for heating a heat exchanger, and a combustion exhaust gas after heat exchange is sucked.
An exhaust fan for taking combustion air into the combustion chamber by Rukoto be discharged via the exhaust passage to the outside of the body in the negative pressure the combustion chamber, below the exhaust fan of the exhaust passage
An exhaust circulation pipe that is provided branching from the flow side and guides the combustion exhaust gas to the combustion chamber, wherein an exhaust outlet is formed at the tip of the exhaust circulation pipe, and the exhaust outlet is located downstream of a burner flame hole in the combustion chamber. Alternatively, the gist is that the position is substantially the same level as the burner flame hole.
【０００５】[0005]
【作用】上記構成を有する本発明の燃焼装置は、バーナ
により熱交換器を加熱し、その燃焼排ガスが排気ファン
により吸い込まれて排気通路を通って本体外へ排出され
ることにより燃焼室内が負圧になり燃焼用空気が燃焼室
に取り込まれる。このとき、排気ファンの下流側の排気
通路は正圧になっており、燃焼排ガスの一部が排気循環
導管を経由して負圧になった燃焼室に導かれる。この排
気循環導管により導かれた燃焼排ガスは、排気出口から
排出されるが、この排気出口がバーナ炎孔より下流側あ
るいはバーナ炎孔と略同レベル位置にあるため、バーナ
本体に直接接触することなく下流側に流れる。この結
果、バーナおよびバーナより上流側の構成部品は、燃焼
排ガスにより腐食することがなく耐久性が向上する。In the combustion apparatus of the present invention having the above-described structure, the heat exchanger is heated by the burner, and the combustion exhaust gas is sucked by the exhaust fan and discharged to the outside of the main body through the exhaust passage.
As a result, the pressure in the combustion chamber becomes negative, and combustion air is taken into the combustion chamber. At this time, the exhaust gas on the downstream side of the exhaust fan
The passage has a positive pressure, and a part of the combustion exhaust gas is led to a negative pressure combustion chamber via an exhaust circulation pipe. The combustion exhaust gas guided by the exhaust circulation pipe is discharged from the exhaust outlet. However, since the exhaust outlet is located downstream from the burner flame hole or at a position substantially at the same level as the burner flame hole, the exhaust gas must be in direct contact with the burner main body. Flows downstream. As a result, the burner and the components upstream of the burner are not corroded by the combustion exhaust gas, and the durability is improved.
【０００６】[0006]
【実施例】以上説明した本発明の構成・作用を一層明ら
かにするために、以下本発明の燃焼装置の好適な実施例
について説明する。図１は一実施例としての強制排気式
給湯器の概略構成図である。強制排気式給湯器１（以
下、単に給湯器と呼ぶ）は、本体ケース（図示略）中央
部に燃焼室２が設けられ、この燃焼室２内に複数のバー
ナユニット３が所定の間隔で並設され、このバーナユニ
ット３の上方に熱交換器４が設けられる。熱交換器４に
は冷水が供給される給水管５と、バーナ燃焼熱により熱
交換されて高温となった湯を送る給湯管６とが接続され
る。この熱交換器４の上部には排気フード７が形成され
ると共に、排気ファン８により燃焼排ガスを排気通路９
を介して本体外に排出するように構成されている。一
方、燃焼室２の下部には給気孔１０が形成され、排気フ
ァン８の強制排気により生じる燃焼室２内の負圧により
燃焼用空気が吸入される。DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the combustion apparatus of the present invention will be described below. FIG. 1 is a schematic configuration diagram of a forced exhaust water heater as one embodiment. A forced exhaust water heater 1 (hereinafter, simply referred to as a water heater) has a combustion chamber 2 provided at a center portion of a main body case (not shown), and a plurality of burner units 3 are arranged in the combustion chamber 2 at predetermined intervals. The heat exchanger 4 is provided above the burner unit 3. The heat exchanger 4 is connected to a water supply pipe 5 to which cold water is supplied, and a hot water supply pipe 6 for sending hot water which has undergone heat exchange due to burner combustion heat. An exhaust hood 7 is formed above the heat exchanger 4, and the exhaust gas is supplied to an exhaust passage 9 by an exhaust fan 8.
It is configured to be discharged out of the main body via the. On the other hand, an air supply hole 10 is formed in a lower portion of the combustion chamber 2, and combustion air is sucked by a negative pressure in the combustion chamber 2 generated by the forced exhaust of the exhaust fan 8.
【０００７】排気通路９の途中には、排気循環導管１１
が分岐して設けられる。この排気循環導管１１は、排気
ファン８により吸い込まれた燃焼排ガスの一部を燃焼室
２に戻すための通路で、その先端が燃焼室２内に水平に
挿通される。排気循環導管１１の先端部は、図２（図１
のＡ−Ａ線概略矢視図）に示すように、各バーナユニッ
ト３の間隙に沿うように所定の間隔をもって平行に分岐
して形成されると共に、この分岐管１２のそれぞれには
上方に向けて開口した複数の排気出口１３が設けられ
る。つまり、各バーナユニット３の間に、それとほぼ同
じ長さの分岐管１２を配設し、しかも、分岐管１２には
バーナ炎孔１４と同様に長手方向に沿って複数の排気出
口１３が設けられる。そして、この分岐管１２に形成さ
れた排気出口１３が、バーナ炎孔１４よりも下流側位置
（この例では上方）となるように分岐管１２の位置が設
定されている。尚、バーナ炎孔１４と同レベル位置であ
ってもよい。In the middle of the exhaust passage 9, an exhaust circulation conduit 11
Are provided in a branched manner. The exhaust gas circulation conduit 11 is a passage for returning a part of the combustion exhaust gas sucked by the exhaust fan 8 to the combustion chamber 2, and its tip is horizontally inserted into the combustion chamber 2. FIG. 2 (FIG. 1)
(A-A line of FIG. 1), the branch pipes 12 are formed so as to be branched in parallel at a predetermined interval along the gap between the burner units 3, and each of the branch pipes 12 is directed upward. A plurality of exhaust outlets 13 which are open are provided. That is, a branch pipe 12 having substantially the same length as that of each burner unit 3 is provided between the burner units 3, and the branch pipe 12 is provided with a plurality of exhaust outlets 13 along the longitudinal direction similarly to the burner flame holes 14. Can be The position of the branch pipe 12 is set so that the exhaust outlet 13 formed in the branch pipe 12 is located downstream (in this example, above) of the burner flame hole 14. The burner flame hole 14 may be at the same level position.
【０００８】次に、給湯器１の動作について説明する。
給湯器１の運転状態においては、バーナ３の燃焼により
熱交換器４に流れる水を加熱すると共に、排気ファン８
の回転により燃焼排ガスが吸い込まれて排気通路９を介
して本体外に排出される。このとき、燃焼室２は排気フ
ァン８の吸引力により負圧を生じて燃焼用空気が給気孔
１０から取り込まれると同時に、排気通路９に流れる燃
焼排ガスの一部が排気循環導管１１を経由して燃焼室２
内に流れ込む。こうして、排ガス再循環が行われるので
ある。Next, the operation of the water heater 1 will be described.
When the water heater 1 is in operation, the water flowing to the heat exchanger 4 is heated by the combustion of the burner 3 and the exhaust fan 8 is heated.
The combustion exhaust gas is sucked by the rotation of and is discharged to the outside of the main body through the exhaust passage 9. At this time, the combustion chamber 2 generates a negative pressure due to the suction force of the exhaust fan 8 and the combustion air is taken in from the air supply hole 10, and at the same time, a part of the combustion exhaust gas flowing to the exhaust passage 9 passes through the exhaust circulation conduit 11. Combustion chamber 2
Flows into. Thus, exhaust gas recirculation is performed.
【０００９】この場合、分岐管１２の排気出口１３から
排ガスが排出されるのであるが、排気出口１３がバーナ
炎孔１４よりも下流側に形成されているために、排ガス
は直接バーナユニット３本体に接触することなく混合ガ
スに混入する。この結果、バーナユニット３，ガスノズ
ル１５，ノズル台１６等が燃焼排ガスにより腐食すると
いった不具合が防止される。また、排気出口１３をバー
ナユニット３間に一葉に設けているため、燃焼排ガスが
均一に燃焼室２内に供給されて窒素酸化物の低減率が向
上する。In this case, the exhaust gas is discharged from the exhaust outlet 13 of the branch pipe 12. However, since the exhaust outlet 13 is formed downstream of the burner flame hole 14, the exhaust gas is directly discharged to the burner unit 3 main body. Mixed into the mixed gas without contacting As a result, such a problem that the burner unit 3, the gas nozzle 15, the nozzle base 16 and the like are corroded by the combustion exhaust gas is prevented. In addition, since the exhaust outlet 13 is provided at one position between the burner units 3, the combustion exhaust gas is uniformly supplied into the combustion chamber 2 and the nitrogen oxide reduction rate is improved.
【００１０】以上本発明の実施例について説明したが、
本発明はこうした実施例に何等限定されるものではな
く、本発明の要旨を逸脱しない範囲において、種々なる
態様で実施し得ることは勿論である。The embodiments of the present invention have been described above.
The present invention is not limited to these embodiments at all, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.
【００１１】[0011]
【発明の効果】以上詳述したように、本発明の燃焼装置
によれば、排気循環導管の排気出口をバーナ炎孔の下流
側あるいはバーナ炎孔と略同レベル位置にしているた
め、燃焼排ガスによりバーナ、ガスノズル、ノズル台と
いった構成部品が腐食されにくくなり耐久性が向上する
という優れた効果を奏する。しかも、排気ファンの下流
側排気通路（正圧）と燃焼室（負圧）との圧力差によ
り、燃焼排ガスを排気循環導管内にスムーズに流すこと
ができ、燃焼排ガスの燃焼室への導入を良好に行うこと
ができる。As described above in detail, according to the combustion apparatus of the present invention, since the exhaust outlet of the exhaust circulation conduit is located at the downstream side of the burner flame hole or at substantially the same level as the burner flame hole, the combustion exhaust gas Accordingly, there is an excellent effect that components such as a burner, a gas nozzle, and a nozzle base are hardly corroded and durability is improved. Moreover, downstream of the exhaust fan
Due to the pressure difference between the side exhaust passage (positive pressure) and the combustion chamber (negative pressure).
Flow of the combustion exhaust gas smoothly into the exhaust circulation pipe
Thus, the flue gas can be satisfactorily introduced into the combustion chamber.
【図１】一実施例としての給湯器の概略構成図である。FIG. 1 is a schematic configuration diagram of a water heater as one embodiment.
【図２】図１におけるＡ−Ａ線矢視図である。FIG. 2 is a view taken along line AA in FIG.
【図３】従来の給湯器の概略構成図である。FIG. 3 is a schematic configuration diagram of a conventional water heater.
１…給湯器、 ２…燃焼室、 ３…バーナユニット、
４…熱交換器、８…排気ファン、 ９…排気通路、 １
１…排気循環導管、 １２…分岐管、１３…排気出口、
１４…バーナ炎孔。1 ... water heater, 2 ... combustion chamber, 3 ... burner unit,
4 heat exchanger, 8 exhaust fan, 9 exhaust passage, 1
1 ... exhaust circulation pipe, 12 ... branch pipe, 13 ... exhaust outlet,
14 Burner flame holes.
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F23C 11/00 F23D 14/76 F23L 15/00 Continuation of the front page (58) Field surveyed (Int. Cl. 7 , DB name) F23C 11/00 F23D 14/76 F23L 15/00
Claims (1)
バーナと、 熱交換された後の燃焼排ガスを吸い込み、排気通路を経
由して本体外へ排出することにより上記燃焼室内を負圧
にして燃焼用空気を上記燃焼室内に取入れる排気ファン
と、 上記排気通路の上記排気ファンより下流側から分岐して
設けられ、燃焼排ガスを燃焼室に導く排気循環導管とを
備え、 上記排気循環導管の先端部に排気出口を形成し、該排気
出口を燃焼室内のバーナ炎孔より下流側あるいはバーナ
炎孔と略同レベル位置としたことを特徴とする燃焼装
置。1. A and the burner for heating the heat exchanger provided in the combustion chamber draws combustion exhaust gas after heat exchange, the combustion chamber by Rukoto be discharged via the exhaust passage to the outside of the body negative pressure An exhaust fan that takes in combustion air into the combustion chamber and an exhaust circulation pipe that is provided in the exhaust passage and is branched from a downstream side of the exhaust fan and guides combustion exhaust gas to the combustion chamber. A combustion apparatus, wherein an exhaust outlet is formed at a distal end of a conduit, and the exhaust outlet is located downstream of a burner flame hole in the combustion chamber or at a position substantially at the same level as the burner flame hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20378095A JP3255395B2 (en) | 1995-07-17 | 1995-07-17 | Combustion equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20378095A JP3255395B2 (en) | 1995-07-17 | 1995-07-17 | Combustion equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0814504A JPH0814504A (en) | 1996-01-19 |
| JP3255395B2 true JP3255395B2 (en) | 2002-02-12 |
Family
ID=16479659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20378095A Expired - Fee Related JP3255395B2 (en) | 1995-07-17 | 1995-07-17 | Combustion equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3255395B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101400834B1 (en) * | 2013-01-23 | 2014-05-29 | 주식회사 경동나비엔 | Combustion apparatus |
-
1995
- 1995-07-17 JP JP20378095A patent/JP3255395B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0814504A (en) | 1996-01-19 |
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