WO1994020793A1 - Premixed gas burning method and combustor - Google Patents

Premixed gas burning method and combustor Download PDF

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Publication number
WO1994020793A1
WO1994020793A1 PCT/JP1994/000363 JP9400363W WO9420793A1 WO 1994020793 A1 WO1994020793 A1 WO 1994020793A1 JP 9400363 W JP9400363 W JP 9400363W WO 9420793 A1 WO9420793 A1 WO 9420793A1
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WO
WIPO (PCT)
Prior art keywords
premixed
gas
combustion
fuel
combustor
Prior art date
Application number
PCT/JP1994/000363
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French (fr)
Japanese (ja)
Inventor
Shigemi Mandai
Katsunori Tanaka
Nobuo Sato
Satoshi Tanimura
Original Assignee
Mitsubishi Jukogyo Kabushiki Kaisha
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Jukogyo Kabushiki Kaisha filed Critical Mitsubishi Jukogyo Kabushiki Kaisha
Priority to CA002134893A priority Critical patent/CA2134893C/en
Priority to DE69419679T priority patent/DE69419679T2/en
Priority to EP94908507A priority patent/EP0643267B1/en
Publication of WO1994020793A1 publication Critical patent/WO1994020793A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/286—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F23L7/002—Supplying water
    • F23L7/005—Evaporated water; Steam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
    • F23R3/04—Air inlet arrangements
    • F23R3/10—Air inlet arrangements for primary air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2210/00—Noise abatement

Definitions

  • the present invention relates to a combustion method of a premixed gas in a combustor having a fuel / air premixed nozzle for achieving low NOx combustion and a combustor.
  • Background technology that can be applied to combustors such as bin combustors, boilers, and chemical furnaces
  • Fig. 3 exemplifies a part of a burner using a conventional premixed gas combustion method.
  • reference numeral 1 denotes a premixed nozzle
  • 2 denotes a premixed gas
  • 3 denotes a flame holding.
  • Vessel 4 is a flame
  • 5 is a circulating or retained high temperature gas
  • 6 is no.
  • Lot Nozzle 7 is No. It shows ⁇ -pit fuel.
  • the premixed gas 2 injected from the premixing nozzle 1 into the fuel tank is burned around the flame holder 3 while burning, and is circulated to the downstream side for flame holding.
  • the hot gas 5 is formed.
  • the combustion speed of the premixed gas that is, the speed at which the flame enters the unburned mixture, depends on the premixed gas temperature. The higher the value, and the higher the fuel concentration in the premixture, the higher the effect. In particular, the fuel concentration significantly alters the burning rate thereby. This change in the burning speed changes the flame length, and eventually causes combustion oscillation.
  • the present invention has been made in order to solve the above-described problems, and therefore, it is difficult to generate combustion oscillation due to a change in the fuel concentration of the premixed gas.
  • the purpose is to provide.
  • the present invention provides:
  • a combustor that has a fuel / air premixing nozzle around the pilot nozzle, the premixing nozzle and the premixed nozzle at the tip of the pilot nozzle
  • a combustor characterized by providing a fluid supply section that does not store fuel between the outlet and the outlet
  • the flame can be directly propagated from the hot gas to the premixed gas by supplying the neutral fluid between the premixed gas layer and the hot gas'. Instead, medium-temperature gas is generated by the mixed diffusion of the high-temperature gas and the neutral fluid, and then the pre-mixed gas is combusted by the mixed diffusion of the medium-temperature gas and the pre-mixed gas. It will be.
  • the combustion mechanism of the premixed gas is that the high-temperature gas and the premixed gas are mixed, and in the process, the premixed gas is heated by the heat given from the high-temperature gas, and the combustion start temperature is reduced. At that point, combustion is started.
  • the combustion is not controlled by the flame propagation as in the case of a normal premixed flame but is controlled by the mixed diffusion control, the influence of the fuel concentration of the premixed gas is small. Combustion becomes possible.
  • Diffusion refers to the mixing of hot gas and premixed gas, and rate limiting refers to controlling (controlling) its speed. Diffusion controlled means controlling the rate at which the hot gas and the premixed gas are mixed.
  • the flame temperature in this mixing region is low, and in this region, The generation of NO x is extremely low.
  • the heat rate means the ratio (dQZdx) at which the fuel (Q) burns with respect to the axial distance (X) of the combustor.
  • FIG. 1 is a schematic explanatory view of a spanner showing an application example of the present invention.
  • FIG. 2 is a graph of experimental data showing the effect of the present invention.
  • Fig. 3 is a schematic illustration of a burner using a conventional premixed combustion method.
  • FIG. 1 shows an example of a burner in which the method according to the present invention has been carried out.
  • the same parts as those shown in FIG. 3 are denoted by the same reference numerals. The detailed description is omitted.
  • a passage for supplying the neutral fluid 8 is formed between the nozzle and the nozzle 6, and the outlet of the neutral fluid 8 into the combustion chamber supplies the neutral fluid 8. It is configured to flow out along the inner wall surface of the flame stabilizer 3.
  • the neutral fluid 8 is a fluid that does not carry fuel, and can be, for example, air, exhaust gas, steam, and the like.
  • the neutral fluid is supplied between the layer of the premixed gas 2 and the circulating high-temperature gas 5, the premixed gas 2 ejected from the premixed nozzle 1 and the high-temperature gas 5 are supplied. The direct contact between the and is eliminated.
  • the neutral fluid 8 first mixes with the high-temperature gas 5 to generate a medium-temperature gas, and behind this, the medium-temperature gas mixes with the premixed gas 2 to form a flame 4.
  • the premixed gas from the high-temperature gas 5 as in the conventional case is not used.
  • the flame is directly propagated to 2, and the premixed gas that is not sufficiently diffused is not forcibly burned. That is, the premixed gas 2 separated from the high-temperature gas 5 by the neutral fluid 8 can perform diffusion-controlled combustion, so that the main flame has a long combustion. . This means that the heat generation rate can be dispersed and combustion oscillation can be prevented.
  • FIG. 2 shows the state of combustion oscillation when a burner using air as the neutral fluid 8 and a conventional burner are burned according to the method of the present invention.
  • This is a graph showing The vertical axis of the graph indicates the internal pressure fluctuation of the combustor, which is a measure of combustion oscillation, and the horizontal axis indicates the total fuel (main fuel + pilot fuel).
  • the figure shows the ratio of wet fuel (pilot fuel 7 for diffusion flame).
  • FIG. 2 shows that the pressure fluctuation ratio of the neutral fluid of the present invention is smaller than that of the conventional case without the neutral fluid, regardless of the size of the pipe port ratio. This indicates that the combustion oscillation is small, The effects of the present invention are supported.
  • the present invention is not limited to the burner shape as shown in FIG. 1, but may be applied to a combustor in which a circulating flow is generated.
  • anything that supplies a neutral fluid is provided, for example, when there are various flame-holding plates or where the flow path rapidly expands, the circulation or stagnation point is increased. It can be applied to things that occur.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)

Abstract

This invention aims at eliminating from a fuel-air premixing nozzle-carrying combustor the inconveniences, such as variation of flame length which is ascribed to variation of combustion rate due to variation of fuel concentration in a premixed gas; and the occurrence of combustion vibration. The present invention provides a combustion method in which a non-fuel-containing fluid (8) is supplied to a space between a premixed gas layer (2) formed by a premixed gas ejected from a premixing nozzle (1) and a high-temperature gas layer (5) formed by a part of a high temperature gas occurring due to the combustion of the premixed gas, which part of the high-temperature gas is circulated or reside in a downstream zone at an outlet portion of the premixing nozzle; and a combustor.

Description

明 細 書 発明 の名称  Description Name of Invention
予混合気の燃焼方法及び燃焼器  Premixed air combustion method and combustor
技術分野  Technical field
本発明 は低 N O x 燃焼を達成す る た め の燃料 · 空気 予混合気 ノ ズルを有す る 燃焼器にお け る 予混合気の燃 焼方法及び燃焼器に関 し、 ガ ス タ ー ビ ン燃焼器、 ボ イ ラ 、 化学工業炉な どの燃焼器に適用 す る こ と がで き る 背景技術  The present invention relates to a combustion method of a premixed gas in a combustor having a fuel / air premixed nozzle for achieving low NOx combustion and a combustor. Background technology that can be applied to combustors such as bin combustors, boilers, and chemical furnaces
ガス タ ー ビ ン燃焼器な どに おい て、 燃焼器排ガス の 低 N O x 化の た め、 最近で は燃料 と 燃焼用空気 と を 予 め混合 さ せ、 こ の予混合気を希薄燃焼さ せ る と い う 方 法が一般的に採用 さ れて い る 。 こ の 予混合気の燃焼方 法に よ れば、 燃料濃度の不均一な領域がな く な る た め 局所的に高温に燃焼す る 領域がな く な り 、 発生 N 0 X を大幅に低減す る こ と がで き る の で あ る 。  In gas turbine combustors, etc., in recent years, fuel and combustion air have been premixed in order to reduce NOx in combustor exhaust gas, and this premixed air has been lean burned. In general, the method of letting them go is adopted. According to this premixed gas combustion method, the region where the fuel concentration is not uniform is eliminated, and the region where local high-temperature combustion is performed is eliminated, and the generation of NOx is greatly reduced. It can be reduced.
図 3 は従来の 予混合気の燃焼方式 に よ る バー ナ のー 部を例示 し た も の で、 図中、 参照符号 1 は予混合ノ ズ ル、 2 は予混合気、 3 は保炎器、 4 は火炎、 5 は循環 又 は滞留高温ガ ス 、 6 は ノ、。 ィ ロ ッ ト ノ ズル、 7 はノ、。 ィ π ッ ト 燃料を示 して い る 。  Fig. 3 exemplifies a part of a burner using a conventional premixed gas combustion method. In the figure, reference numeral 1 denotes a premixed nozzle, 2 denotes a premixed gas, and 3 denotes a flame holding. Vessel, 4 is a flame, 5 is a circulating or retained high temperature gas, 6 is no. Lot Nozzle, 7 is No. It shows π-pit fuel.
予混合ノ ズル 1 か ら 燃料器内へ噴出 さ れた 予混合気 2 は燃焼 し な が ら保炎器 3 を巻 く よ う に し て そ の後流 側に保炎 の た め の循環高温ガ ス 5 を形成す る 。 と こ ろ で、 こ の よ う な 予混合気の燃焼方法に お い て、 予混合気の燃焼速度、 す なわ ち火炎が未燃混合気に進 入す る 速度は、 予混合気温度が高い ほ ど、 ま た、 予混 合気中の燃料濃度が大 き い ほ ど、 高い と い う 作用 があ る 。 特に 、 燃料濃度は こ れに よ る 燃焼速度を著 し く 変 化 さ せ る 。 こ の燃焼速度の変化 は火炎長を変化 さ せ る こ と に な り 、 ひ い て は燃焼振動の発生原因 と な る 。 The premixed gas 2 injected from the premixing nozzle 1 into the fuel tank is burned around the flame holder 3 while burning, and is circulated to the downstream side for flame holding. The hot gas 5 is formed. In such a method of burning a premixed gas, the combustion speed of the premixed gas, that is, the speed at which the flame enters the unburned mixture, depends on the premixed gas temperature. The higher the value, and the higher the fuel concentration in the premixture, the higher the effect. In particular, the fuel concentration significantly alters the burning rate thereby. This change in the burning speed changes the flame length, and eventually causes combustion oscillation.
発明 の開示  DISCLOSURE OF THE INVENTION
本発明 は上記問題点を解決す る た め に な さ れた も の で、 予混合気の燃料濃度の変化に よ る 燃焼振動が発生 し に く ぃ 予混合気の燃焼方法及び燃焼器を提供す る こ と を 目 的 と す る 。  The present invention has been made in order to solve the above-described problems, and therefore, it is difficult to generate combustion oscillation due to a change in the fuel concentration of the premixed gas. The purpose is to provide.
上記 目 的に対 し、 本発明 は、  In contrast to the above objects, the present invention provides:
(1) 燃料 · 空気予混合ノ ズルを有す る 燃焼器に よ る 予 混合気の燃焼方法に お いて、 予混合ノ ズルか ら噴出 し て形成 さ れ る 予混合気層 と 、 予混合気の燃焼に よ り 生 じ た高温ガ ス の一部が予混合ノ ズル出口部の下流域に て循環又 は滞留す る こ と に よ り 形成 さ れる 高温ガ ス 層 と の間に、 燃料を含ま な い流体を供給す る こ と を特徴 と す る 予混合気の燃焼方法、 及び  (1) In a method of burning a premixed gas by a combustor having a fuel / air premixed nozzle, a premixed gas layer formed by jetting from the premixed nozzle and a premixed gas A part of the high-temperature gas generated by the combustion of the gas circulates or stays in the downstream area of the outlet of the premixing nozzle, and forms a high-temperature gas layer formed by the stagnant gas. A method for burning a premixed gas characterized by supplying a fuel-free fluid; and
(2) パ イ ロ ッ ト ノ ズルの周囲に燃料 · 空気予混合ノ ズ ルを有す る 燃焼器に お い て、 ノ、' イ ロ ッ ト ノ ズル先端外 周側 と 予混合ノ ズル出口 と の間に燃料を舍ま な い流体 の供給部を設 けて な る こ と を特徴 と す る 燃焼器  (2) In a combustor that has a fuel / air premixing nozzle around the pilot nozzle, the premixing nozzle and the premixed nozzle at the tip of the pilot nozzle A combustor characterized by providing a fluid supply section that does not store fuel between the outlet and the outlet
を提供す る 。 上述の手段に よ れば、 予混合気層 と 高温ガ ス'と の間 に 中性流体を供給す る こ と に よ り 、 高温ガス か ら 直接 予混合気に火炎伝播す る こ と がな く 、 高温ガ ス と 中性 流体 と の混合拡散に よ り 中温ガ ス を生成 し 、 そ の後、 こ の 中温ガ ス と 予混合気 と の混合拡散に よ り 予混合気 が燃焼す る こ と に な る 。 I will provide a . According to the above-described means, the flame can be directly propagated from the hot gas to the premixed gas by supplying the neutral fluid between the premixed gas layer and the hot gas'. Instead, medium-temperature gas is generated by the mixed diffusion of the high-temperature gas and the neutral fluid, and then the pre-mixed gas is combusted by the mixed diffusion of the medium-temperature gas and the pre-mixed gas. It will be.
予混合気の燃焼メ カ ニ ズム は、 高温ガス と 予混合気 が混 じ り 合い、 そ の過程で 予混合気 は高温ガス か ら 与 え ら れた熱で加熱 さ れ、 燃焼開始温度に達 し た時点で 燃焼が開始 さ れる 。  The combustion mechanism of the premixed gas is that the high-temperature gas and the premixed gas are mixed, and in the process, the premixed gas is heated by the heat given from the high-temperature gas, and the combustion start temperature is reduced. At that point, combustion is started.
し た が っ て、 本発明に よ れば、 通常の 予混合火炎の よ う に火炎伝播で燃焼せずに混合拡散律速で燃焼す る た め、 予混合気の燃料濃度の影響の小 さ な燃焼が可能 と な る 。  Therefore, according to the present invention, since the combustion is not controlled by the flame propagation as in the case of a normal premixed flame but is controlled by the mixed diffusion control, the influence of the fuel concentration of the premixed gas is small. Combustion becomes possible.
なお、 拡散 と は高温ガ ス と 予混合気が混 じ り 合 う こ と を い い、 律速 と はそ の速度を律す る （ 制御す る ） こ と を い う 。 拡散律速 と は、 高温ガス と 予混合気の混 じ り 合 う 速度を制御す る こ と を意味す る 。  Diffusion refers to the mixing of hot gas and premixed gas, and rate limiting refers to controlling (controlling) its speed. Diffusion controlled means controlling the rate at which the hot gas and the premixed gas are mixed.
ま た、 高温ガ ス と 中性流体 と が混合 し て 中温ガ ス と な っ た後、 予混合気 と 混合す る た め、 こ の混合領域で の火炎温度が低 く 、 こ の領域で の N O x の発生 は極め て少な い。  In addition, since the high-temperature gas and the neutral fluid are mixed to form a medium-temperature gas and then mixed with the premixed gas, the flame temperature in this mixing region is low, and in this region, The generation of NO x is extremely low.
さ ら に、 拡散律速の燃焼 と す る こ と がで き る た め、 主火炎が長 く 、 発熱率が分散で き る た め、 燃焼振動を 防止す る こ と がで き る 。 こ こ で、 燃焼振動を防止で き る 理由 は、 発熱率が分散す る と 燃焼圧が低 く な る か ら で あ り 、 ま た、 火炎が長 く な つ た分、 火炎長の変化が 全火炎長か ら 相対的に みて わずかに な る 力、 ら で あ る 。 Furthermore, since diffusion-limited combustion can be achieved, the main flame is long and the heat generation rate can be dispersed, so that combustion oscillation can be prevented. Here, combustion oscillation can be prevented. The reason for this is that when the heat generation rate is dispersed, the combustion pressure becomes lower, and the change in flame length is relatively large compared to the total flame length, because the flame is longer. These are the powers that become slight.
な お、 発熱率 と は、 燃料 （ Q ) が燃焼器の軸方向距 離 （ X ) に対 し て燃え る 割合 ( d Q Z d x ) を い う 。  The heat rate means the ratio (dQZdx) at which the fuel (Q) burns with respect to the axial distance (X) of the combustor.
図面の簡単な説明  BRIEF DESCRIPTION OF THE FIGURES
図 1 は 本発明の適用例を示 し た パー ナ の概略説明 図で あ る  FIG. 1 is a schematic explanatory view of a spanner showing an application example of the present invention.
図 2 は 本発明 の効果を示 し た実験デー タ の グ ラ フ で あ る 。  FIG. 2 is a graph of experimental data showing the effect of the present invention.
図 3 は 従来の予混合燃焼方法に よ る バ一ナ の概略 説明図で あ る 。  Fig. 3 is a schematic illustration of a burner using a conventional premixed combustion method.
発明を実施す る た め の最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
図 1 は本発明に よ る 方法を実施 し た バー ナ の一例を 示 し て お り 、 図中、 図 3 に示 し た も の と 同一の部分に つ いて は同一の符号を付 して そ の詳細 な説明 は省略す る 。  FIG. 1 shows an example of a burner in which the method according to the present invention has been carried out. In the figure, the same parts as those shown in FIG. 3 are denoted by the same reference numerals. The detailed description is omitted.
図 1 に よ れば、 予混合 ノ ズル 1 と ノ、。 イ ロ ッ ト ノ ズル 6 と の間に 中性流体 8 を供給す る た め の通路が形成 さ れてお り 、 そ の燃焼室内へ の 中性流体 8 の噴出口 は中 性流体 8 を保炎器 3 の内壁面に沿 っ て流出 さ せ る よ う に構成 さ れて い る 。 中性流体 8 は燃料を舍ま な い流体 で あ っ て、 た と え ば空気、 排ガ ス 、 蒸気な ど と す る こ と がで き る 。  According to FIG. 1, premixed nozzles 1 and 2. A passage for supplying the neutral fluid 8 is formed between the nozzle and the nozzle 6, and the outlet of the neutral fluid 8 into the combustion chamber supplies the neutral fluid 8. It is configured to flow out along the inner wall surface of the flame stabilizer 3. The neutral fluid 8 is a fluid that does not carry fuel, and can be, for example, air, exhaust gas, steam, and the like.
図 1 の構成に よ れば、 予混合ノ ズル 1 力、 ら 噴出 し た 予混合気 2 の層 と 循環高温ガ ス 5 と の間に 中性流体を 供給す る よ う に し た の で、 予混合ノ ズル 1 か ら 噴出 し た 予混合気 2 と 高温ガ ス 5 と が直接接触す る こ と がな く な る 。 中性流体 8 は ま ず高温ガス 5 と 混合 し て 中温 ガス を生成 し、 そ の後方に て こ の 中温ガ ス は予混合気 2 と混合 し て火炎 4 を形成す る 。 According to the configuration of Fig. 1, one premixed nozzle erupted Since the neutral fluid is supplied between the layer of the premixed gas 2 and the circulating high-temperature gas 5, the premixed gas 2 ejected from the premixed nozzle 1 and the high-temperature gas 5 are supplied. The direct contact between the and is eliminated. The neutral fluid 8 first mixes with the high-temperature gas 5 to generate a medium-temperature gas, and behind this, the medium-temperature gas mixes with the premixed gas 2 to form a flame 4.
つ ま り 、 高温ガ ス 5 と 予混合ノ ズル 1 か ら 供給 さ れ た 予混合気 2 と が直接触れる こ と がな い の で、 従来の よ う な高温ガ ス 5 か ら 予混合気 2 へ直接火炎伝播 し、 十分に拡散 し て い な い 予混合気が強制的に燃焼 さ せ ら れ る こ と がな い。 すなわ ち、 中性流体 8 に よ っ て高温 ガ ス 5 か ら 隔て ら れた 予混合気 2 は拡散律速 の燃焼を す る こ と がで き る た め、 主火炎が長い燃焼 と な る 。 こ の こ と は、 発熱率の分散がで き 、 燃焼振動を防止す る こ と がで き る こ と を意味す る 。  That is, since the hot gas 5 and the premixed gas 2 supplied from the premixing nozzle 1 do not come into direct contact with each other, the premixed gas from the high-temperature gas 5 as in the conventional case is not used. The flame is directly propagated to 2, and the premixed gas that is not sufficiently diffused is not forcibly burned. That is, the premixed gas 2 separated from the high-temperature gas 5 by the neutral fluid 8 can perform diffusion-controlled combustion, so that the main flame has a long combustion. . This means that the heat generation rate can be dispersed and combustion oscillation can be prevented.
図 2 は本発明方法に よ る 、 中性流体 8 と し て空気を 用 い た バー ナ と 従来の バー ナ と を そ れぞれ使用 し て燃 焼 さ せ た と き の燃焼振動の状態を示 し た グ ラ フ で あ る 。 ダ ラ フ の縦軸 は燃焼振動の 目 安 と な る 燃焼器の 内圧変 動を示 し 、 横蚰 は全燃料 （ メ イ ン燃料 + パ イ ロ ッ ト 燃 料 ） に対す る パ イ ロ ッ ト 燃料 （ 拡散火炎用 のパ イ ロ ッ ト 燃料 7 ) の比率を示 し た も の で あ る 。 図 2 は、 パ イ 口 ッ ト 比率の大小に拘わ ら ず本発明 の 中性流体あ り の 方が従来の 中性流体な し の場合よ り も 圧力変動比が小 さ い、 つ ま り 、 燃焼振動が小 さ い こ と を 示 し て お り 、 本発明 に よ る 効果を裏付 けて い る 。 FIG. 2 shows the state of combustion oscillation when a burner using air as the neutral fluid 8 and a conventional burner are burned according to the method of the present invention. This is a graph showing The vertical axis of the graph indicates the internal pressure fluctuation of the combustor, which is a measure of combustion oscillation, and the horizontal axis indicates the total fuel (main fuel + pilot fuel). The figure shows the ratio of wet fuel (pilot fuel 7 for diffusion flame). FIG. 2 shows that the pressure fluctuation ratio of the neutral fluid of the present invention is smaller than that of the conventional case without the neutral fluid, regardless of the size of the pipe port ratio. This indicates that the combustion oscillation is small, The effects of the present invention are supported.
なお、 本発明 は、 図 1 の よ う な バー ナ 形状に限 ら れ る も の で は な く 、' 循環流の生 じ る 燃焼器に お い て、 そ の循環流 と 予混合気 と の間に 中性流体を供給す る も の を全て舍み、 た と え ば様 々 な保炎板を有す る も のや流 路が急拡大す る 部分で循環流又 は澱み点が生 じ る も の 等に適用 す る こ と がで き る 。  It should be noted that the present invention is not limited to the burner shape as shown in FIG. 1, but may be applied to a combustor in which a circulating flow is generated. In the meantime, anything that supplies a neutral fluid is provided, for example, when there are various flame-holding plates or where the flow path rapidly expands, the circulation or stagnation point is increased. It can be applied to things that occur.

Claims

請求の範囲 The scope of the claims
1 . 燃料 · 空気予混合 ノ ズルを有す る 燃焼器に よ る 予混合気の燃焼方法に おい て、 予混合ノ ズルか ら 噴出 して形成 さ れ る 予混合気層 と 、 予混合気の燃焼に よ り 生 じ た高温ガ ス の一部が予混合ノ ズル出口部の下流域 に て循環又 は滞留す る こ と に よ り 形成 さ れる 高温ガ ス 層 と の間に、 燃料を含ま な い流体を供給す る こ と を特 徴 と す る 予混合気の燃焼方法。  1. Combustion of premixed gas by a combustor having fuel / air premixed nozzles, a premixed gas layer formed by jetting from the premixed nozzles and a premixed gas. A portion of the high-temperature gas generated by combustion of the fuel is circulated or retained in the downstream area of the outlet of the premixing nozzle, and the high-temperature gas layer formed by the fuel is interposed between the high-temperature gas layer and the high-temperature gas layer. A method for burning a premixed gas, characterized by supplying a fluid that does not contain oxygen.
2 . ノ、' ィ ロ ッ ト ノ ズ ル の周囲に燃料 · 空気予混合ノ ズ ルを有す る 燃焼器に お い て、 パ イ ロ ッ ト ノ ズル先端外 周側 と 予混合ノ ズ ル出口 と の間に燃焼を舍ま な い流体 の供給部を設 けて な る こ と を特徴 と す る 燃焼器。  2. In a combustor that has a fuel / air premixing nozzle around the pilot nozzle, the premixing nozzle and the outer peripheral side of the pilot nozzle tip A combustor characterized by having a fluid supply unit that does not burn in between the outlet and the outlet.
PCT/JP1994/000363 1993-03-08 1994-03-08 Premixed gas burning method and combustor WO1994020793A1 (en)

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CA002134893A CA2134893C (en) 1993-03-08 1994-03-08 Method and combustor for the combustion of a premixed gas
DE69419679T DE69419679T2 (en) 1993-03-08 1994-03-08 METHOD AND DEVICE FOR COMBUSTION OF PRE-MIXED GAS
EP94908507A EP0643267B1 (en) 1993-03-08 1994-03-08 Premixed gas burning method and combustor

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JP5/72948 1993-03-08
JP07294893A JP3197103B2 (en) 1993-03-08 1993-03-08 Premixed air combustion method

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EP0643267A1 (en) 1995-03-15
CA2134893C (en) 1999-09-07
EP0643267A4 (en) 1996-03-27
JPH06257750A (en) 1994-09-16
CA2134893A1 (en) 1994-09-15
EP0643267B1 (en) 1999-07-28
JP3197103B2 (en) 2001-08-13
DE69419679D1 (en) 1999-09-02
DE69419679T2 (en) 2000-03-02

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