JP2662017B2 - All-primary pneumatic combustion of gas fuel - Google Patents
All-primary pneumatic combustion of gas fuelInfo
- Publication number
- JP2662017B2 JP2662017B2 JP4377389A JP4377389A JP2662017B2 JP 2662017 B2 JP2662017 B2 JP 2662017B2 JP 4377389 A JP4377389 A JP 4377389A JP 4377389 A JP4377389 A JP 4377389A JP 2662017 B2 JP2662017 B2 JP 2662017B2
- Authority
- JP
- Japan
- Prior art keywords
- flame
- air
- combustion
- forming member
- peripheral wall
- 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 16
- 239000000446 fuel Substances 0.000 title claims description 16
- 230000002093 peripheral effect Effects 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 11
- 238000013459 approach Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000006262 metallic foam Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
Landscapes
- Gas Burners (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、バーナケースの周壁部分と保炎部形成部材
との間に形成した炎口において、ガス燃料と理論空気量
以上の燃焼用空気との混合気を噴出させて燃焼させる方
法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fuel port formed between a peripheral wall portion of a burner case and a flame holding portion forming member, and a combustion air having a stoichiometric air amount or more. And a method of injecting and burning an air-fuel mixture.
従来、第３図（イ）に示すように、バーナケース
（１）の周壁部分（1a）の近くにも保炎部（Ｘ）を形成
し、周壁部分（1a）と保炎部形成部材（４）の間の炎口
（６）において、断面形状が山形状の炎を両側の基端が
保炎部（Ｘ）に接近する状態で形成させていた。Conventionally, as shown in FIG. 3 (a), a flame holding portion (X) is formed near the peripheral wall portion (1a) of the burner case (1), and the peripheral wall portion (1a) and the flame retaining portion forming member ( In the flame outlet (6) during 4), a flame having a mountain-shaped cross section was formed with the base ends on both sides approaching the flame holding portion (X).
しかし、低NOX化のために炎口（６）に供給する混合
気の空気比を増大させると、第３図（ロ）に示すように
炎（Ｆ）が周壁部分（1a）から浮上った状態となり、そ
の浮上つた部分（Ｙ）で不完全燃焼が発生して、CO発生
量が増大する。However, Tsu floats from increasing the air ratio of the mixture supplied to the flame port for low NO X reduction (6), the flame as shown in FIG. 3 (b) (F) is a peripheral wall portion (1a) And the incomplete combustion occurs in the floating portion (Y), thereby increasing the amount of CO generated.
したがって、CO発生を十分に抑制するためには空気比
を1.7〜1.8程度以下に設定しなければならず、空気比の
増大による低NOX化の面でさらに改良の余地があった。Therefore, in order to sufficiently suppress the CO occurrence must set the air ratio below about 1.7 to 1.8, there is room for further improvement in terms of low NO X reduction by increasing the air ratio.
本発明の目的は、空気比を1.8〜2.0程度まで増大して
も、不完全燃焼を十分に抑制できるようにし、低NOX化
を一層十分に実現できるようにする点にある。An object of the present invention, even when increasing the air ratio to about 1.8 to 2.0, the incomplete combustion to allow sufficiently suppressed, lies in that such a low NO X reduction can be more fully realized.
本発明の特徴手段は、バーナケースの周壁部分と保炎
部形成部材の間に形成した炎口からの混合気噴出方向に
前記周壁部分から壁体を延出し、前記壁体の延出長さ
l1、前記周壁部分と前記保炎部形成部材の間隔l2を、混
合気の噴出速度ν１と燃焼速度ν２に対して、 l1/l2≧ν1/ν２ になるように設定して、 前記炎口による炎を、基端が前記保炎部形成部材に接
近すると共に先端が前記壁体に接近する状態で、かつ、
断面形状がほぼ三角形になる状態で形成させることにあ
り、その作用効果は次の通りである。The characteristic means of the present invention is such that the wall extends from the peripheral wall in a direction in which the air-fuel mixture is ejected from a flame port formed between the peripheral wall of the burner case and the flame holding portion forming member, and the extension length of the wall is
l 1 , the distance l 2 between the peripheral wall portion and the flame holding part forming member is set such that l 1 / l 2 ≧ ν 1 / ν 2 with respect to the air-jet velocity ν 1 and the combustion velocity ν 2 . Setting, the flame by the flame outlet, in a state where the base end approaches the flame holding part forming member and the tip approaches the wall body, and
The cross-sectional shape is formed in a substantially triangular state, and the operation and effect are as follows.
つまり、いかなる手段を講じれば安定燃焼を維持しな
がら空気比を増大できるかについて、各種実験により追
求したところ、例えば第１図に示すように、壁体の延出
長さl1を十分に大きくし、その延出長さl1、及び、周壁
部分と保炎部形成部材の間隔l2を、空気比の混合気の噴
出速度ν１と燃焼速度ν２に見合ってかつ上述の式を満
たすように設定すると、炎口による炎がほぼ三角形の断
面形状になると共に、炎の基端が保炎部形成部材にかつ
先端が壁体に接近した状態で安定し、例えば空気比を1.
8〜2.0程度に増大しても、例えばCO/CO2＜0.005という
ようにCO発生を十分に抑制した良好燃焼を安定維持でき
る事実を見出した。In other words, whether it increases the air ratio while maintaining a stable combustion when Kojire any means, was pursued by various experiments, for example as shown in FIG. 1, the extending length l 1 of the wall sufficiently large The extension length l 1 , and the interval l 2 between the peripheral wall portion and the flame holding part forming member are matched to the jet velocity ν 1 and the combustion velocity ν 2 of the air-fuel mixture and satisfy the above-mentioned formula. With this setting, the flame formed by the flame outlet has a substantially triangular cross-sectional shape, and the base end of the flame stabilizes with the flame holding portion forming member and the front end close to the wall.
Even if it is increased to about 8 to 2.0, it has been found that, for example, CO / CO 2 <0.005 can stably maintain good combustion with sufficiently suppressed CO generation.
他方、CH4において空気比とNO2濃度の相関を調べたと
ころ、第４図にしめすようになり、前述の従来技術のよ
うに空気比が1.7から1.8程度以下であれば、NO2濃度が
２〜3ppm以上になるが、本発明のように空気比を1.8〜
2.0程度に増大できるとNO2濃度を2ppm以下にでき、十分
な低NOX化を図れる。On the other hand, when the correlation between the air ratio and the NO 2 concentration was examined in CH 4 , the result was as shown in FIG. 4, and if the air ratio was about 1.7 to 1.8 or less as in the above-described conventional technique, the NO 2 concentration was reduced. 2-3 ppm or more, but as in the present invention, the air ratio is 1.8 to
If it can be increased to about 2.0, the NO 2 concentration can be reduced to 2 ppm or less, and a sufficiently low NO X can be achieved.
その結果、燃焼排ガスのNOXとCOを十分に減少させ
て、ガス燃料の燃焼による大気汚染を一段と効果的に防
止できるようになった。As a result, sufficiently reduces the NO X and CO in flue gas, we can now more effectively prevent the air pollution caused by the combustion of fuel gas.
次に、第１図により実施例を示す。 Next, an embodiment is shown in FIG.
バーナケース（１）にガス燃料供給路（２）とブロア
（Ｂ）からの燃焼用空気供給路（３）を接続し、ガス燃
料と理論空気量以上の燃焼用空気との混合気をバーナケ
ース（１）内に供給する。ガス燃料は都市ガス、天然ガ
ス、プロパン等である。A gas fuel supply path (2) and a combustion air supply path (3) from a blower (B) are connected to the burner case (1), and a mixture of gas fuel and combustion air having a theoretical air amount or more is burned. (1) Supply inside. The gas fuel is city gas, natural gas, propane or the like.
バーナケース（１）の周壁部分（1a）のほぼ中央に保
炎部形成部材（４）を配置し、周壁部分（1a）と保炎部
形成部材（４）の間に多孔体（５）により炎口（６）を
形成し、混合気を炎口（６）から噴出させて燃焼させ
る。多孔体（５）はメタルフォーム、パンチングメタ
ル、金網、多孔セラミックスなどである。A flame holding part forming member (4) is arranged at substantially the center of the peripheral wall part (1a) of the burner case (1), and a porous body (5) is provided between the peripheral wall part (1a) and the flame keeping part forming member (4). A flame port (6) is formed, and the air-fuel mixture is ejected from the flame port (6) and burned. The porous body (5) is a metal foam, a punched metal, a wire mesh, a porous ceramic, or the like.
炎口（６）からの混合気噴出方向に周壁部分（1a）か
ら壁体（７）を延出し、壁体（７）の延出長さl1、及
び、周壁部分（1a）と保炎部形成部材（４）の間隔l
2を、混合気の噴出速度ν１と燃焼速度ν２に対して、 l1/l2≧ν1/ν２ になるように設定し、炎口（６）による長さl3の炎を断
面形状がほぼ三角形になる状態で形成させ、炎（F1）の
基端（Ａ）を保炎部形成部材（４）にかつ先端（Ｂ）を
壁体（７）に接近させて、混合気の空気比入を1.8から
2.0程度まで増大しても、CO/CO2＜0.005になる完全燃焼
を炎（F1）のリフトの無い状態で安定維持させ、空気比
の増大によるNOX化を図る。The wall (7) extends from the peripheral wall portion (1a) in the direction of the air-fuel mixture ejection from the flame outlet (6), and the extension length l 1 of the wall body (7) and the flame holding with the peripheral wall portion (1a). Spacing l of part forming member (4)
2, relative to the ejection speed [nu 1 and the combustion speed [nu 2 of the mixture was set to be l 1 / l 2 ≧ ν 1 / ν 2, the length l 3 of the flame by burner ports (6) The flame (F 1 ) is formed so as to have a substantially triangular cross-section, and the base (A) of the flame (F 1 ) is brought close to the flame holding part forming member (4) and the front end (B) is brought close to the wall (7) to mix. From 1.8 to qi air ratio
Be increased up to about 2.0, CO / CO 2 <stabilize maintain complete combustion to become 0.005 lift the absence of the flame (F 1), achieving NO X reduction by increasing the air ratio.
尚、インプットを調節したり、空気比を変化させると
炎（F1）の長さl3が比例的に変化し、炎（F1）の先端
（Ｂ）が壁体（７）を伝って移動する。Incidentally, or adjust the input, the length l 3 of varying the air ratio flames (F 1) is proportionally changed, the tip of the flame (F 1) (B) is along the wall (7) Moving.
次に別の実施例を説明する。 Next, another embodiment will be described.
保炎部形成部材（４）は形状、設置数、配置などにお
いて適宜変更自在であり、例えば第２図に示すように２
個の保炎部形成部材（４）を設けて、保炎部形成部材
（４）どうし間に多孔体（５）により山形の炎（F2）を
形成する炎口（６）を形成してもよい。The flame holding part forming member (4) can be appropriately changed in shape, number of installations, arrangement, and the like. For example, as shown in FIG.
The flame holding part forming members (4) are provided, and a flame opening (6) for forming a chevron flame (F 2 ) by the porous body (5) is formed between the flame holding part forming members (4). Is also good.
壁体（７）を耐熱保温材で形成し、炎（F1）の壁体
（７）への放熱による不安定化を防止してもよい。The wall (7) may be formed of a heat-insulating material to prevent instability due to heat release of the flame (F 1 ) to the wall (7).
ガス燃料の種類、空気比（≧１）、バーナの用途など
は不問である。The type of gas fuel, the air ratio (≧ 1), the use of the burner, etc. are not questionable.
尚、特許請求の範囲の項に図面との対照を便利にする
為に符号を記すが、該記入により本発明は添付図面の構
造に限定されるものではない。In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.
第１図は本発明の実施例を示すバーナ概念図、第２図は
本発明の別実施例を示すバーナ概念図である。 第３図（イ），（ロ）は従来例のバーナ概念図である。 第４図は空気比入とNO2濃度の相関を示すグラフであ
る。 （１）……バーナケース、（1a）……周壁部分、（４）
……保炎部形成部材、（６）……炎口、（７）……壁
体、（Ａ）……炎基端、（Ｂ）……炎先端、（F1）……
炎。FIG. 1 is a conceptual diagram of a burner showing an embodiment of the present invention, and FIG. 2 is a conceptual diagram of a burner showing another embodiment of the present invention. FIGS. 3A and 3B are conceptual diagrams of a conventional burner. FIG. 4 is a graph showing the correlation between the air ratio and the NO 2 concentration. (1) ... burner case, (1a) ... peripheral wall part, (4)
...... flame holding portion forming member, (6) ... flame hole, (7) ... wall, (A) ... Honoomototan, (B) ...... flame tip, (F 1) ...
flame.
Claims (1)
炎部形成部材（４）との間に形成した炎口（６）におい
て、ガス燃料と理論空気量以上の燃焼用空気との混合気
を噴出させて燃焼させる方法であって、 前記炎口（６）からの混合気噴出方向に前記周壁部分
（1a）から延出した壁体（７）の延出長さl1、前記周壁
部分（1a）と前記保炎部形成部材（４）の間隔l2を、混
合気の噴出速度ν１と燃焼速度ν２に対して、 l1/l2≧ν1/ν２ になるように設定して、 前記炎口（６）による炎（F1）を、基端（Ａ）が前記保
炎部形成部材（４）に接近すると共に先端（Ｂ）が前記
壁体（７）に接近する状態で、かつ、断面形状がほぼ三
角形になる状態で形成させるガス燃料の全一次空気式燃
焼法。1. A flame port (6) formed between a peripheral wall portion (1a) of a burner case (1) and a flame holding part forming member (4), and a gas fuel and combustion air having a theoretical air amount or more. A method of jetting the air-fuel mixture and burning it, wherein an extension length l 1 of a wall body (7) extending from the peripheral wall portion (1a) in the air-fuel mixture jetting direction from the flame port (6); The distance l 2 between the peripheral wall portion (1a) and the flame holding part forming member (4) is set to l 1 / l 2 ≧ ν 1 / ν 2 with respect to the air-fuel mixture ejection velocity ν 1 and the combustion velocity ν 2 . The flame (F 1 ) of the flame outlet (6) is set so that the base end (A) approaches the flame holding part forming member (4), and the front end (B) moves the wall (7). ) And a method of all-primary pneumatic combustion of gaseous fuel which is formed in a state in which the cross-sectional shape is substantially triangular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4377389A JP2662017B2 (en) | 1989-02-23 | 1989-02-23 | All-primary pneumatic combustion of gas fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4377389A JP2662017B2 (en) | 1989-02-23 | 1989-02-23 | All-primary pneumatic combustion of gas fuel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02223707A JPH02223707A (en) | 1990-09-06 |
| JP2662017B2 true JP2662017B2 (en) | 1997-10-08 |
Family
ID=12673075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4377389A Expired - Lifetime JP2662017B2 (en) | 1989-02-23 | 1989-02-23 | All-primary pneumatic combustion of gas fuel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2662017B2 (en) |
-
1989
- 1989-02-23 JP JP4377389A patent/JP2662017B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02223707A (en) | 1990-09-06 |
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