JP3144359B2 - Fuel gas amount control device for premixed gas burner - Google Patents
Fuel gas amount control device for premixed gas burnerInfo
- Publication number
- JP3144359B2 JP3144359B2 JP28434597A JP28434597A JP3144359B2 JP 3144359 B2 JP3144359 B2 JP 3144359B2 JP 28434597 A JP28434597 A JP 28434597A JP 28434597 A JP28434597 A JP 28434597A JP 3144359 B2 JP3144359 B2 JP 3144359B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- fuel gas
- control valve
- combustion air
- amount control
- 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
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- Regulation And Control Of Combustion (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、予混合式ガスバ
ーナにおける燃料ガス量制御装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel gas amount control device for a premixed gas burner.
【０００２】[0002]
【従来の技術】予混合式ガスバーナは、燃焼用空気と燃
料ガスとを予め所定の比率で混合し、この予混合気を燃
焼させるものである。燃焼用空気量と燃料ガス量との比
率を、一般に空燃比と呼ぶが、この空燃比は燃焼中、常
に一定の値に維持する必要がある。空燃比が燃焼中に変
動すると、ＣＯやＮＯｘの生成量が増大したり、消炎が
発生する。2. Description of the Related Art A premixed gas burner mixes combustion air and fuel gas at a predetermined ratio in advance and burns the premixed gas. The ratio between the amount of combustion air and the amount of fuel gas is generally called an air-fuel ratio, and this air-fuel ratio must always be maintained at a constant value during combustion. If the air-fuel ratio fluctuates during combustion, the amount of generated CO or NOx increases, or flame extinction occurs.
【０００３】[0003]
【発明が解決しようとする課題】この発明は、燃焼用空
気量の変動に合わせて燃料ガス量を調整し、空燃比を一
定値に維持するもので、燃焼用空気量に大きな変動が生
じても確実に空燃比を一定値に維持することができる、
予混合式ガスバーナの燃料ガス量制御装置を提供するこ
とを目的としている。SUMMARY OF THE INVENTION The present invention adjusts the fuel gas amount in accordance with the fluctuation of the combustion air amount and maintains the air-fuel ratio at a constant value. It is also possible to reliably maintain the air-fuel ratio at a constant value,
It is an object of the present invention to provide a fuel gas amount control device for a premixed gas burner.
【０００４】[0004]
【課題を解決するための手段】この発明は、上述の課題
に鑑みてなされたもので、燃焼用空気が流通するダクト
内に略ベンチュリ形状をした絞り部材を設け、この絞り
部材のスロート部に燃料ガス噴出口を設け、前記スロー
ト部の上流位置の圧力ＰA を検出する第１圧力検出ライ
ンに減圧手段を設け、この減圧手段により減圧した圧力
ＰA1と前記スロート部の圧力ＰB との差に基づいて燃料
ガス量を制御する制御弁を備えたことを第１の特徴とし
ている。また、この発明は、前記圧力ＰB を検出する第
２圧力検出ラインに圧力変動吸収用オリフィスを設けた
ことを第２の特徴としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a substantially venturi-shaped throttle member provided in a duct through which combustion air flows, and a throat portion of the throttle member. the fuel gas ejection port is provided, the pressure reducing means to the first pressure detecting line for detecting the pressure P a in the upstream position of the throat portion is provided, the pressure P B of the throat portion and the pressure P A1 which was reduced by the pressure reducing means The first feature is that a control valve for controlling the fuel gas amount based on the difference is provided. Further, the present invention is that of providing the pressure P B for an orifice the pressure fluctuation absorber to the second pressure detecting line for detecting that the second feature.
【０００５】[0005]
【発明の実施の形態】この発明の予混合式ガスバーナ
は、一端に送風機、他端にバーナエレメントを設けたダ
クトを備える。このダクト内を、前記送風機からの燃焼
用空気が流通する。ダクト内の途中箇所に、略ベンチュ
リ形状をした絞り部材を設け、この絞り部材のスロート
部に燃料ガス噴出口を穿設する。このスロート部におけ
る静圧低下により、燃料ガスが燃焼用空気に吸引され
る。この燃焼用空気と燃料ガスとの予混合気が、前記バ
ーナエレメントに供給され、火炎が形成される。BEST MODE FOR CARRYING OUT THE INVENTION A premixed gas burner according to the present invention includes a duct provided with a blower at one end and a burner element at the other end. The combustion air from the blower flows through this duct. A substantially venturi-shaped throttle member is provided at an intermediate position in the duct, and a fuel gas injection port is formed in a throat portion of the throttle member. Due to the decrease in the static pressure at the throat portion, the fuel gas is sucked into the combustion air. The premixed air of the combustion air and the fuel gas is supplied to the burner element to form a flame.
【０００６】前記スロート部の上流位置の圧力ＰA と前
記スロート部の圧力ＰB との差に基づいて燃料ガス量を
制御する制御弁を備える。すなわち、燃焼用空気量が変
動するとその変動に応じて前記圧力ＰA と前記圧力ＰB
との差も変動するので、その差に基づいて燃料ガス量を
制御して、空燃比を一定値に維持する。前記圧力ＰAを
検出する第１圧力検出ラインに減圧手段を設け、この減
圧手段により減圧した圧力ＰA1を前記制御弁に導入す
る。そうすることにより、前記制御弁に導入する圧力
を、制御弁の制御可能な値まで減圧することができると
ともに、燃焼用空気の圧力に大きな変動が生じても、減
圧後はその変動も減衰しているため、燃料ガス量の制御
への影響を少なくすることができる。[0006] comprising a control valve for controlling the amount of fuel gas based on a difference between the pressure P B of the throat portion and the pressure P A in the upstream position of the throat portion. That is, when the amount of combustion air is varied with the pressure P A in accordance with the variation the pressure P B
Therefore, the fuel gas amount is controlled based on the difference, and the air-fuel ratio is maintained at a constant value. A pressure reducing means is provided in the first pressure detection line for detecting the pressure PA, and the pressure PA1 reduced by the pressure reducing means is introduced into the control valve. By doing so, the pressure introduced into the control valve can be reduced to a value controllable by the control valve, and even if a large change occurs in the pressure of the combustion air, the change is also attenuated after the pressure reduction. Therefore, the influence on the control of the fuel gas amount can be reduced.
【０００７】前記圧力ＰB を検出する第２圧力検出ライ
ンに、圧力変動吸収用オリフィスを設ける。この圧力変
動吸収用オリフィスを１個または複数個設けることによ
り、ダクト内で圧力変動が生じても、それを圧力変動吸
収用オリフィスで吸収して、燃料ガス量の制御への影響
を少なくすることができる。[0007] second pressure detecting line for detecting the pressure P B, provided the pressure fluctuation damping orifice. By providing one or more pressure fluctuation absorbing orifices, even if pressure fluctuations occur in the duct, they are absorbed by the pressure fluctuation absorbing orifices to reduce the influence on the control of the fuel gas amount. Can be.
【０００８】[0008]
【実施例】以下、この発明の好適な実施例について、図
面に基づいて説明する。燃焼用空気の流路を構成する筒
状のダクト１の先端に、予混合気を噴出し燃焼させるバ
ーナエレメント２を設けている。このバーナエレメント
２は、その表面に多数の予混合気噴出口を有している。
ダクト１の他端には、燃焼用空気を送る送風機（図示せ
ず）を設けている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. A burner element 2 for ejecting and burning premixed air is provided at the end of a cylindrical duct 1 constituting a flow path of combustion air. The burner element 2 has a large number of premixed gas jets on its surface.
The other end of the duct 1 is provided with a blower (not shown) for sending combustion air.
【０００９】ダクト１内の途中箇所に、略ベンチュリ形
状をした絞り部材３を設けている。この絞り部材３は、
対をなす相似形をした部材を対面させて配置することに
より構成し、絞り部材３とダクト１との間に一対のガス
室４，４を形成している。これらのガス室４，４は、適
宜の手段により連通させている（詳細図示省略）。A throttle member 3 having a substantially Venturi shape is provided at an intermediate position in the duct 1. This aperture member 3 is
A pair of gas chambers 4 and 4 are formed between the throttle member 3 and the duct 1 by arranging a pair of similar members facing each other. These gas chambers 4 and 4 are communicated by an appropriate means (detailed illustration is omitted).
【００１０】前記絞り部材３は、燃焼用空気の流れ方向
上流側より、流路断面積が漸次減少するノズル部５、流
路断面積が略同一のスロート部６、流路断面積が漸次増
加するディフューザ部７を備えている。前記スロート部
６に複数の燃料ガス噴出口８を穿設している。The throttle member 3 has a nozzle portion 5 whose flow passage cross-section gradually decreases, a throat portion 6 whose flow passage cross-section is substantially the same, and a flow passage cross-section that gradually increases from the upstream side in the flow direction of the combustion air. The diffuser unit 7 is provided. A plurality of fuel gas outlets 8 are formed in the throat 6.
【００１１】前記ガス室４に、燃料ガス供給管９を接続
している。この燃料ガス供給管９には、上流側より順
に、燃料ガスの供給・停止を制御する燃料弁１０、燃焼
用空気量の変動に応じて燃料ガスの供給量を調整する制
御弁１１、燃料ガス用オリフィス１２を設けている。前
記制御弁１１は、燃料ガスの供給を遮断する機能も有し
ている。A fuel gas supply pipe 9 is connected to the gas chamber 4. A fuel valve 10 for controlling the supply and stop of the fuel gas, a control valve 11 for adjusting the supply amount of the fuel gas according to a change in the amount of combustion air, and a fuel gas Orifice 12 is provided. The control valve 11 also has a function of shutting off the supply of the fuel gas.
【００１２】前記制御弁１１には、前記スロート部６の
上流位置の圧力ＰA を検出する第１圧力検出ライン１
３、前記スロート部６の圧力ＰB を検出する第２圧力検
出ライン１４、燃料ガス供給管９における制御弁１１と
燃料ガス用オリフィス１２との間の圧力ＰC を検出する
第３圧力検出ライン１５を接続している。制御弁１１
は、前記各圧力検出ラインより導入した圧力に基づき、
内部のダイヤフラム機構（詳細図示省略）により燃焼用
空気量の変動に応じて燃焼ガス量を調整する機能を有し
ている。すなわち、燃焼用空気量が変動すると前記圧力
ＰA と前記圧力ＰBとの差も変動するので、その差と前
記圧力ＰC とをバランスさせるようにして燃料ガス量を
制御し、空燃比を一定値に維持する。[0012] The control valve 11 includes a first pressure detecting line 1 for detecting the pressure P A in the upstream position of the throat portion 6
3, a third pressure sensing line for detecting a pressure P C between the control valve 11 and the fuel gas orifice 12 in the second pressure detection line 14, the fuel gas supply pipe 9 for detecting the pressure P B of the throat section 6 15 are connected. Control valve 11
Is based on the pressure introduced from each of the pressure detection lines,
The internal diaphragm mechanism (details not shown) has a function of adjusting the amount of combustion gas according to the fluctuation of the amount of combustion air. That is, when the combustion air amount fluctuates, the difference between the pressure P A and the pressure P B also fluctuates. Therefore, the fuel gas amount is controlled so as to balance the difference with the pressure P C, and the air-fuel ratio is reduced. Maintain a constant value.
【００１３】前記第１圧力検出ライン１３には、減圧手
段１６を設けている。この減圧手段１６により減圧した
圧力ＰA1を、制御弁１１に導入するようにしている。減
圧手段１６は、圧力ＰA の一部を大気中に逃がす構成に
なっており、第１オリフィス１７および第２オリフィス
１８を備えている。この減圧手段１６を設けることによ
り、制御弁１１に導入する圧力ＰA1を、制御弁１１が確
実に動作可能な値まで減圧することができるとともに、
燃焼用空気の圧力に大きな変動が生じても、減圧後はそ
の変動も減衰しているため、燃料ガス量の制御への影響
を少なくすることができる。The first pressure detecting line 13 is provided with a pressure reducing means 16. The pressure P A1 reduced by the pressure reducing means 16 is introduced into the control valve 11. The pressure reducing means 16 is configured to release a part of the pressure P A into the atmosphere, and includes a first orifice 17 and a second orifice 18. By providing the pressure reducing means 16, the pressure P A1 introduced to the control valve 11 can be reduced to a value at which the control valve 11 can operate reliably.
Even if a large fluctuation occurs in the pressure of the combustion air, the fluctuation is attenuated after the decompression, so that the influence on the control of the fuel gas amount can be reduced.
【００１４】前記第２圧力検出ライン１４には、圧力変
動吸収用オリフィス１９を設けている。この圧力変動吸
収用オリフィス１９を設けることにより、ダクト１内で
圧力変動が生じても、それを吸収して、燃料ガス量の制
御への影響を少なくすることができる。図示した実施例
では、圧力変動吸収用オリフィス１９を２個設けてい
る。The second pressure detecting line 14 is provided with a pressure fluctuation absorbing orifice 19. By providing the pressure fluctuation absorbing orifice 19, even if a pressure fluctuation occurs in the duct 1, it can be absorbed and the influence on the control of the fuel gas amount can be reduced. In the illustrated embodiment, two pressure fluctuation absorbing orifices 19 are provided.
【００１５】次に、上述の構成について、その作用を説
明する。スロート部６において、流路断面積が絞り部材
３の上流位置の約１／５になっている。したがって、ダ
クト１内を上流側より送られてきた燃焼用空気は、スロ
ート部６においてその流速が高まり、燃焼用空気と燃料
ガス噴出口８より噴出した燃料ガスとが効率良く混合さ
れる。また、スロート部６においては、燃焼用空気の静
圧低下により、燃料ガスを吸引する作用も働く。燃焼用
空気と燃料ガスの予混合気は、バーナエレメント２に送
られ、燃焼する。Next, the operation of the above configuration will be described. In the throat section 6, the cross-sectional area of the flow path is about 1/5 of the upstream position of the throttle member 3. Therefore, the flow rate of the combustion air sent from the upstream side in the duct 1 is increased in the throat portion 6, and the combustion air and the fuel gas ejected from the fuel gas outlet 8 are efficiently mixed. Further, in the throat portion 6, the function of sucking the fuel gas also works due to a decrease in the static pressure of the combustion air. The premixed air of combustion air and fuel gas is sent to the burner element 2 and burns.
【００１６】スロート部６の上流位置の圧力ＰA は減圧
手段１６により圧力ＰA1に減圧されて、この圧力ＰA1が
第１圧力検出ライン１３を介して制御弁１１に導入され
る。スロート部６の圧力ＰB は、第２圧力検出ライン１
４を介して制御弁１１に導入される。燃料ガス供給管９
における圧力ＰC は、第３圧力検出ライン１５を介して
制御弁１１に導入される。これらの圧力のうち、ＰA1−
ＰB は燃焼用空気量に対応し、ＰC −ＰB は燃料ガス量
に対応する。したがって、空燃比を一定にするには、
（ＰC −ＰB ）／（ＰA1−ＰB ）の値が一定になるよう
に、制御弁１１で燃料ガスの流量を調整する。The pressure P A at the upstream position of the throat 6 is reduced to a pressure P A1 by the pressure reducing means 16, and the pressure P A1 is introduced to the control valve 11 through the first pressure detection line 13. The pressure P B of the throat section 6 is equal to the second pressure detection line 1
4, is introduced into the control valve 11. Fuel gas supply pipe 9
The pressure P C in is introduced to the control valve 11 via a third pressure sensing line 15. Of these pressures, P A1 −
P B corresponds to the combustion air amount, and P C -P B corresponds to the fuel gas amount. Therefore, to keep the air-fuel ratio constant,
The control valve 11 adjusts the flow rate of the fuel gas so that the value of (P C −P B ) / (P A1 −P B ) becomes constant.
【００１７】図２に、前記制御弁１１の具体的構造を示
す。同図に示す実施例では、前記燃料弁１０と前記制御
弁１１を一体に構成している。前記制御弁１１は、第１
ダイアフラム２０、第２ダイアフラム２１および第３ダ
イアフラム２２を備え、これらのダイアフラムに対し
て、前記圧力ＰA1，ＰB ，ＰC を作用させる構成になっ
ている。これらの圧力のバランスにより、リンク機構２
３が動作し、それに伴い、このリンク機構に連結してい
るサーボ弁２４が動作し、燃料ガスの流量が調整され
る。FIG. 2 shows a specific structure of the control valve 11. In the embodiment shown in the figure, the fuel valve 10 and the control valve 11 are integrally formed. The control valve 11 has a first
A diaphragm 20, a second diaphragm 21, and a third diaphragm 22 are provided, and the pressures P A1 , P B , and P C are applied to these diaphragms. By the balance of these pressures, the link mechanism 2
3, the servo valve 24 connected to the link mechanism is operated, and the flow rate of the fuel gas is adjusted.
【００１８】[0018]
【発明の効果】この発明は、以上のような構成であるの
で、減圧手段を設けることにより、制御弁に導入する圧
力を、制御弁で正確に制御可能な値ＰA1まで減圧するこ
とができるとともに、燃焼用空気の圧力に大きな変動が
生じても、減圧後はその変動も減衰しているため、燃料
ガス量の制御への影響を少なくすることができる。ま
た、第２圧力検出ラインに設けた圧力変動吸収用オリフ
ィスにより、ダクト内で大きな圧力変動が生じても、そ
れをこのオリフィスで吸収して、燃料ガス量の制御への
影響を少なくすることができる。According to the present invention, the pressure introduced to the control valve can be reduced to a value P A1 that can be accurately controlled by the control valve by providing the pressure reducing means. At the same time, even if a large fluctuation occurs in the pressure of the combustion air, the fluctuation is attenuated after the pressure is reduced, so that the influence on the control of the fuel gas amount can be reduced. Also, even if a large pressure fluctuation occurs in the duct, the orifice provided in the second pressure detection line absorbs the fluctuation, so that the orifice can absorb the fluctuation and reduce the influence on the control of the fuel gas amount. it can.
【図１】この発明の一実施例を示す説明図である。FIG. 1 is an explanatory diagram showing one embodiment of the present invention.
【図２】この発明における制御弁の一実施例を示す説明
図である。FIG. 2 is an explanatory diagram showing one embodiment of a control valve according to the present invention.
１ ダクト ３ 絞り部材 ６ スロート部 ８ 燃料ガス噴出口 １３ 第１圧力検出ライン １４ 第２圧力検出ライン １６ 減圧手段 １９ 圧力変動吸収用オリフィス DESCRIPTION OF SYMBOLS 1 Duct 3 Throttle member 6 Throat part 8 Fuel gas injection port 13 First pressure detection line 14 Second pressure detection line 16 Pressure reducing means 19 Orifice for absorbing pressure fluctuation
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) F23N 5/18 101 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) F23N 5/18 101
Claims (2)
ンチュリ形状をした絞り部材３を設け、この絞り部材３
のスロート部６に燃料ガス噴出口８を設け、前記スロー
ト部６の上流位置の圧力ＰA を検出する第１圧力検出ラ
イン１３に減圧手段１６を設け、この減圧手段１６によ
り減圧した圧力ＰA1と前記スロート部６の圧力ＰB との
差に基づいて燃料ガス量を制御する制御弁１１を備えた
ことを特徴とする予混合式ガスバーナの燃料ガス量制御
装置。1. A substantially venturi-shaped throttle member 3 is provided in a duct 1 through which combustion air flows.
The fuel gas port 8 to the throat portion 6 provided in the vacuum means 16 to the first pressure detecting line 13 for detecting the pressure P A in the upstream position of the throat portion 6 is provided, the pressure P A1 was depressurized by the pressure reducing means 16 the difference fuel gas amount control apparatus for premixed gas burner, characterized in that it comprises a control valve 11 for controlling the amount of fuel gas based on the pressure P B of the throat portion 6.
燃料ガス量制御装置において、前記圧力ＰB を検出する
第２圧力検出ライン１４に圧力変動吸収用オリフィス１
９を設けたことを特徴とする予混合式ガスバーナの燃料
ガス量制御装置。2. A claim in the fuel gas amount control apparatus for a premixing type gas burner as claimed in 1, wherein the pressure P orifice for pressure fluctuation absorption to a second pressure detecting line 14 for detecting the B 1
9. A fuel gas amount control device for a premixed gas burner, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28434597A JP3144359B2 (en) | 1997-09-30 | 1997-09-30 | Fuel gas amount control device for premixed gas burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28434597A JP3144359B2 (en) | 1997-09-30 | 1997-09-30 | Fuel gas amount control device for premixed gas burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11108352A JPH11108352A (en) | 1999-04-23 |
| JP3144359B2 true JP3144359B2 (en) | 2001-03-12 |
Family
ID=17677385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28434597A Expired - Lifetime JP3144359B2 (en) | 1997-09-30 | 1997-09-30 | Fuel gas amount control device for premixed gas burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3144359B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101259764B1 (en) * | 2012-02-15 | 2013-05-07 | 주식회사 경동나비엔 | Dual venturi for gas boiler |
| JP6191961B2 (en) * | 2013-11-07 | 2017-09-06 | 静岡製機株式会社 | Combustion control device |
| JP6488550B2 (en) * | 2014-03-27 | 2019-03-27 | 三浦工業株式会社 | boiler |
| JP2016020789A (en) * | 2014-07-15 | 2016-02-04 | 三浦工業株式会社 | Boiler system |
| EP3006827A1 (en) * | 2014-10-09 | 2016-04-13 | Robert Bosch Gmbh | High modulation range mixer and a premix system comprising thereof |
| US20180355792A1 (en) * | 2017-06-09 | 2018-12-13 | General Electric Company | Annular throats rotating detonation combustor |
| US20180355795A1 (en) * | 2017-06-09 | 2018-12-13 | General Electric Company | Rotating detonation combustor with fluid diode structure |
| JP7006363B2 (en) * | 2018-02-22 | 2022-01-24 | 三浦工業株式会社 | Boiler device |
-
1997
- 1997-09-30 JP JP28434597A patent/JP3144359B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11108352A (en) | 1999-04-23 |
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