JPS6239328B2 - - Google Patents
Info
- Publication number
- JPS6239328B2 JPS6239328B2 JP56091858A JP9185881A JPS6239328B2 JP S6239328 B2 JPS6239328 B2 JP S6239328B2 JP 56091858 A JP56091858 A JP 56091858A JP 9185881 A JP9185881 A JP 9185881A JP S6239328 B2 JPS6239328 B2 JP S6239328B2
- Authority
- JP
- Japan
- Prior art keywords
- combustion
- secondary flame
- flame hole
- transition metal
- coil
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims description 24
- 229910052723 transition metal Inorganic materials 0.000 claims description 9
- 150000003624 transition metals Chemical class 0.000 claims description 9
- 239000007789 gas Substances 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 5
- 238000010531 catalytic reduction reaction Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
- F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Description
【発明の詳細な説明】
本発明は予混合燃焼させるバーナに２段燃焼と
接触環元を付加することにより窒素酸化物（以後
NOxと記す）の発生を抑制する燃焼装置に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention adds two-stage combustion and a catalytic ring element to a burner that performs premix combustion.
This relates to a combustion device that suppresses the generation of NOx (denoted as NOx).
燃焼装置より生ずるNOxを低減する技術とし
て、排煙脱硝技術が挙げられるが、この中で接触
環元法は、適当な触媒の存在下に還元ガスを添加
することにより、NOをN2に還元させるものであ
る。還元ガスは選択還元ではNH3を用いるが、反
応温度が高温すぎるとNH3の酸化反応によりNO
が生成するので脱硝率が低下するために温度管理
が難しい。一方非選択還元ではCO，CH4を用い
るが、排ガス中のO2濃度に比例して還元ガス消
費量が増大するという問題を有している。しかも
両者共に家庭用燃焼器具に展開する場合に還元ガ
スを用いることは多くの危険をはらんでいる。 Flue gas denitration technology is one of the technologies to reduce NOx generated from combustion equipment, and among these, the catalytic reduction method reduces NO to N2 by adding reducing gas in the presence of an appropriate catalyst. It is something that makes you NH 3 is used as the reducing gas in selective reduction, but if the reaction temperature is too high, NO will be produced due to the oxidation reaction of NH 3 .
is generated, which reduces the denitrification rate and makes temperature control difficult. On the other hand, non-selective reduction uses CO and CH 4 , but has the problem that reducing gas consumption increases in proportion to the O 2 concentration in the exhaust gas. Moreover, when both of them are used in household combustion appliances, the use of reducing gas is fraught with many dangers.
本発明は２段燃焼と遷移金属系触媒を用いるこ
とにより、積極的に還元ガスを添加することなく
接触還元を実現し、低NOx燃焼を行う燃焼装置
の提供を目的としている。 The present invention aims to provide a combustion device that achieves catalytic reduction without actively adding reducing gas by using two-stage combustion and a transition metal catalyst, and performs low NOx combustion.
以下に本発明の一実施例について、第１図、第
２図に基づいて説明する。気体燃料を噴出するノ
ズル１はバーナ２の混合管入口３に対向する位置
に設け、その際ノズルから噴出される気体燃料の
ジエツトにより吸引される１次空気量を空気過剰
率ｍが0.6〜0.9になるように混合管入口３の口径
をダンパ等により調整する。バーナ２の１次孔４
は燃焼室５並びに単一の開口部からなる２次炎孔
６を形成する容器７にて覆われており、前記２次
炎孔６に生じる２次炎内に遷移金属からなるコイ
ルを、２次炎内に完全に納まるよう設ける。 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. A nozzle 1 for ejecting gaseous fuel is provided at a position facing the mixing pipe inlet 3 of the burner 2, and at this time, the amount of primary air sucked in by the jet of gaseous fuel ejected from the nozzle is set such that the excess air ratio m is 0.6 to 0.9. Adjust the diameter of the mixing pipe inlet 3 using a damper etc. so that Primary hole 4 of burner 2
is covered with a combustion chamber 5 and a container 7 forming a secondary flame hole 6 consisting of a single opening, and a coil made of a transition metal is inserted into the secondary flame generated in the secondary flame hole 6. Next, install it so that it is completely contained within the flame.
上記の如く構成された燃焼装置に於て、混合管
内の可燃性ガスは燃料過濃の状態で１次炎孔４上
に流出し、１次火炎９を形成する。１次火炎９か
ら放出される燃焼ガス中には酸素不足のために燃
焼できない可燃性ガスの他に、NOも含まれてい
る。可燃性ガスは２次炎孔６にて周囲空気と拡散
混合して、２次火炎１０を形成し２段燃焼を完成
させる。 In the combustion apparatus configured as described above, the combustible gas in the mixing tube flows out onto the primary flame hole 4 in a fuel-rich state to form the primary flame 9. The combustion gas released from the primary flame 9 contains NO as well as combustible gas that cannot be burned due to lack of oxygen. The combustible gas diffuses and mixes with the surrounding air at the secondary flame hole 6 to form a secondary flame 10 and complete two-stage combustion.
前記可燃性ガス中のCOは前記遷移金属製コイ
ルを触媒として、NO，NO2と反応を進行させ
る。 The CO in the combustible gas reacts with NO and NO 2 using the transition metal coil as a catalyst.
CO＋NO2→CO2＋NO (1)
CO＋１／２O2→CO2 (2)
2CO＋2NO→2CO2＋N2 (3)
上式の反応の内ではNO2をNOへ還元する反応
が最も速く、ついで(2)式のCO酸化反応が速い。
(3)式のNOの還元反応は(2)式の反応によつてO2が
消費されてから進行する。したがつて、NOが還
元されるためには(1)，(2)式の反応を十分行なわせ
るだけのCOがなくてはならないことになる。し
かしながら、燃焼ガス中の残存O2濃度は空気過
剰率ｍを0.6〜0.9に制御しているために、極めて
低く、NO2量もそれによりほとんど発生していな
い。 CO＋NO 2 →CO 2 +NO (1) CO＋1/2O 2 →CO 2 (2) 2CO＋2NO→2CO 2 +N 2 (3) Of the reactions in the above equation, the reaction to reduce NO 2 to NO is the fastest, followed by (2 ) CO oxidation reaction is fast.
The reduction reaction of NO in formula (3) proceeds after O 2 is consumed by the reaction in formula (2). Therefore, in order for NO to be reduced, there must be enough CO to carry out the reactions of equations (1) and (2). However, the residual O 2 concentration in the combustion gas is extremely low because the excess air ratio m is controlled to 0.6 to 0.9, and the amount of NO 2 is therefore hardly generated.
このため反応としては、(3)式が進行することに
なり、当量のCO，CO2，N2に酸化及び還元され
る。 Therefore, the reaction proceeds as shown in equation (3), and is oxidized and reduced to equivalent amounts of CO, CO 2 and N 2 .
この結果、燃焼器具から排出されるNOxは、
２段燃焼によりその発生を抑制されると共に、一
部は接触還元によりN2に還元されることにな
る。又、COも接触還元に際して、CO2に酸化さ
れために低減される。 As a result, NOx emitted from combustion appliances is
The two-stage combustion suppresses its occurrence, and a portion of it is reduced to N 2 by catalytic reduction. Furthermore, during catalytic reduction, CO is oxidized to CO 2 and is therefore reduced.
第３図に具体的効果を示す。横軸はインプツト
であり、縦軸はNOx濃度（O2＝０％換算）を示
す。 Figure 3 shows specific effects. The horizontal axis represents the input, and the vertical axis represents the NOx concentration (converted to O 2 =0%).
本発明の他の効果として、酸素濃度変化の検知
を容易に行ない得るという点である。今、仮りに
酸素濃度とイオン電流という立場で酸素濃度変化
を考えてみる。遷移金属製コイルを２次炎孔上の
２次炎内に設けた場合と設けない場合について、
酸素濃度とイオン電流の関係を第４図に示す。横
軸は室内の酸素濃度を、縦軸はイオン電流を表わ
す。前者の場合、酸素濃度に対してイオン電流は
急激に変化するが、後者は緩やかに変化すること
がわかる。これらの事実は遷移金属製コイルを２
次炎孔上の２次炎内に設けることにより、酸素濃
度の検知と制御が行ない易いことを示している。 Another advantage of the present invention is that changes in oxygen concentration can be easily detected. Let's now consider changes in oxygen concentration from the perspective of oxygen concentration and ion current. Regarding the case where a transition metal coil is installed in the secondary flame above the secondary flame hole and the case where it is not installed,
FIG. 4 shows the relationship between oxygen concentration and ionic current. The horizontal axis represents the oxygen concentration in the room, and the vertical axis represents the ionic current. It can be seen that in the former case, the ionic current changes rapidly with respect to oxygen concentration, but in the latter case, it changes gradually. These facts indicate that transition metal coils are
This shows that oxygen concentration can be easily detected and controlled by providing it in the secondary flame above the secondary flame hole.
以上のように、本発明の燃焼装置によれば、予
混合燃焼させるバーナの１次炎孔を燃焼室と２次
炎孔とからなる容器にて覆い、前記２次炎孔上の
２次炎内に遷移金属系触媒を設けるという簡単な
構成により、NOx及びCOの発生を抑制する効果
が得られる。 As described above, according to the combustion apparatus of the present invention, the primary flame hole of the burner for premix combustion is covered with a container consisting of a combustion chamber and the secondary flame hole, and the secondary flame above the secondary flame hole is A simple configuration in which a transition metal catalyst is provided inside the fuel cell can produce the effect of suppressing the generation of NOx and CO.
また、遷移金属系触媒は２次炎により高温状態
となるため酸欠等による２次炎の２次炎孔からの
リフトを抑制する保炎効果を有する。 Furthermore, since the transition metal catalyst is brought into a high temperature state by the secondary flame, it has a flame-holding effect that suppresses the lifting of the secondary flame from the secondary flame hole due to oxygen deficiency, etc.
第１図は本発明の一実施例による燃焼装置の正
面図、第２図は同装置における縦断面図、第３図
は同装置と従来予混合バーナによる排出NOx濃
度の比較図、第４図は本発明の燃焼装置と２段燃
焼のみの燃焼装置に於る酸素濃度とイオン電流の
関係図である。
１……ノズル、２……バーナ、３……混合管入
口、４……１次炎孔、５……燃焼室、６……２次
炎孔、７……容器、８……遷移金属製コイル、９
……１次火炎、１０……２次火炎。
FIG. 1 is a front view of a combustion device according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of the same device, FIG. 3 is a comparison diagram of exhaust NOx concentration between the same device and a conventional premix burner, and FIG. 4 is a diagram showing the relationship between oxygen concentration and ion current in the combustion device of the present invention and the combustion device using only two-stage combustion. 1... Nozzle, 2... Burner, 3... Mixing tube inlet, 4... Primary flame hole, 5... Combustion chamber, 6... Secondary flame hole, 7... Container, 8... Made of transition metal coil, 9
...Primary flame, 10...Secondary flame.
Claims (1)
燃焼室を形成し、かつ、上面に単一の開口部から
なる２次炎孔とを有する容器にて囲繞すると共
に、前記容器の２次炎孔上の全長にわたり、遷移
金属からなるコイルを前記２次炎孔と接触させて
設け、前記コイルの大きさを２次炎内に完全に納
まるように規定したことを特徴とする燃焼装置。1 Multiple primary flame holes of a burner that performs premix combustion,
A combustion chamber is formed and surrounded by a container having a secondary flame hole consisting of a single opening on the upper surface, and a coil made of a transition metal is placed over the entire length of the secondary flame hole of the container. A combustion device characterized in that the coil is provided in contact with a secondary flame hole, and the size of the coil is determined so as to be completely contained within the secondary flame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56091858A JPS57207704A (en) | 1981-06-15 | 1981-06-15 | Combustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56091858A JPS57207704A (en) | 1981-06-15 | 1981-06-15 | Combustor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57207704A JPS57207704A (en) | 1982-12-20 |
| JPS6239328B2 true JPS6239328B2 (en) | 1987-08-22 |
Family
ID=14038250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56091858A Granted JPS57207704A (en) | 1981-06-15 | 1981-06-15 | Combustor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57207704A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2573486B2 (en) * | 1985-11-21 | 1997-01-22 | イーテーツェーオー・トレーデイング・ウント・コンサルテイング・コンパニー・アクチエンゲゼルシャフト | Equipment for raising the temperature of the catalyst |
| JPH02219902A (en) * | 1989-02-22 | 1990-09-03 | Matsushita Electric Ind Co Ltd | Burning device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5232460A (en) * | 1975-09-05 | 1977-03-11 | Aisin Warner Ltd | Gear reduction for automobile |
| JPS52143522A (en) * | 1976-05-25 | 1977-11-30 | Toshiba Corp | Gas burner |
| JPS5424327A (en) * | 1977-07-25 | 1979-02-23 | Osaka Gas Co Ltd | Surface combustion type combusting device |
| JPS5424347A (en) * | 1977-07-25 | 1979-02-23 | Hitachi Ltd | Refrigeration cycle |
-
1981
- 1981-06-15 JP JP56091858A patent/JPS57207704A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5232460A (en) * | 1975-09-05 | 1977-03-11 | Aisin Warner Ltd | Gear reduction for automobile |
| JPS52143522A (en) * | 1976-05-25 | 1977-11-30 | Toshiba Corp | Gas burner |
| JPS5424327A (en) * | 1977-07-25 | 1979-02-23 | Osaka Gas Co Ltd | Surface combustion type combusting device |
| JPS5424347A (en) * | 1977-07-25 | 1979-02-23 | Hitachi Ltd | Refrigeration cycle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57207704A (en) | 1982-12-20 |
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