JPH10185128A - High temperature air low nox burner - Google Patents
High temperature air low nox burnerInfo
- Publication number
- JPH10185128A JPH10185128A JP8346987A JP34698796A JPH10185128A JP H10185128 A JPH10185128 A JP H10185128A JP 8346987 A JP8346987 A JP 8346987A JP 34698796 A JP34698796 A JP 34698796A JP H10185128 A JPH10185128 A JP H10185128A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- air
- air supply
- burner
- outlet
- 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.)
- Granted
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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えばスラブを所
定の温度まで加熱する加熱炉に適用する高温空気用の低
ＮＯｘバーナに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low NOx burner for high-temperature air applied to a heating furnace for heating a slab to a predetermined temperature.
【０００２】[0002]
【従来の技術】近年、加熱炉等に適用するバーナは、予
熱空気の温度が４００〜５００℃程度であった従来バー
ナの課題、すなわち、排熱回収効率が低く、加熱炉等の
燃料原単位をさらに向上させるために、８００℃以上の
高温の予熱空気を使用するようになってきている。2. Description of the Related Art In recent years, a burner applied to a heating furnace or the like has a problem of a conventional burner in which the temperature of preheated air is about 400 to 500 ° C. In order to further improve the temperature, preheated air having a high temperature of 800 ° C. or more has been used.
【０００３】このように、８００℃以上の高温の予熱空
気を使用する場合には、排熱回収効率が高く、加熱炉等
の燃料原単位が向上するが、その反面、予熱空気の高温
化により、火炎温度が上昇してＮＯｘ（窒素酸化物）の
濃度が高くなるという問題がある。そこで、高温の予熱
空気を使用するバーナにおける前記した問題点を解決す
るものとして、例えば特開平８−２８８３０号公報の高
温空気バーナが提案されている。As described above, when preheated air having a high temperature of 800 ° C. or more is used, the efficiency of exhaust heat recovery is high, and the unit fuel consumption of a heating furnace and the like is improved. However, there is a problem that the flame temperature rises and the concentration of NOx (nitrogen oxide) increases. In order to solve the above-mentioned problems in a burner using high-temperature preheated air, for example, a high-temperature air burner disclosed in JP-A-8-28830 has been proposed.
【０００４】特開平８−２８８３０号公報で提案された
高温空気バーナは、図７に示すように、燃料供給管１の
先端側の外周に、一次空気供給孔２を介してバッフル３
を設け、このバッフル３に複数の二次空気供給孔４を配
置すると共に、前記燃料供給管１の先端側のバッフル３
に一次燃焼室５を配置した構成であり、二次空気供給孔
４の仮想ピッチ円の直径Ｄと一次燃焼室５の直径ｄとの
比（Ｄ／ｄ）は２．０以上、一次燃焼室５の長さＬと前
記直径ｄとの比（Ｌ／ｄ）は１．５〜２．５とすること
が望ましいとしている。As shown in FIG. 7, a high-temperature air burner proposed in Japanese Patent Application Laid-Open No. 8-28830 has a baffle 3 on the outer periphery of a fuel supply pipe 1 at a tip side through a primary air supply hole 2.
A plurality of secondary air supply holes 4 are arranged in the baffle 3 and the baffle 3 on the tip side of the fuel supply pipe 1 is provided.
The ratio (D / d) of the diameter D of the virtual pitch circle of the secondary air supply hole 4 to the diameter d of the primary combustion chamber 5 is 2.0 or more, and the primary combustion chamber 5 It is stated that the ratio (L / d) of the length L to the diameter d is preferably 1.5 to 2.5.
【０００５】この特開平８−２８８３０号公報で提案さ
れた高温空気バーナでは、一次燃焼室５内において燃料
と一次空気で一次燃焼を行い、この未燃分を含有した一
次燃焼ガスと高温の二次空気を直接炉内に高速で噴射し
て加熱炉内で二次燃焼を行うことで、火炎から周囲への
放射伝熱量が増大して、最高火炎温度が低下すると共
に、低酸素濃度の炉内ガスの誘引により燃焼反応が抑制
されて火炎が長炎となり、被加熱材の均一加熱に必要な
フラットな炉温分布の確保と、ＮＯｘの生成が抑制でき
るとしている。In the high-temperature air burner proposed in Japanese Patent Application Laid-Open No. 8-28830, primary combustion is performed with fuel and primary air in a primary combustion chamber 5, and a primary combustion gas containing unburned components and a high-temperature secondary combustion gas are used. By injecting secondary air directly into the furnace at high speed and performing secondary combustion in the heating furnace, the amount of radiant heat transfer from the flame to the surroundings increases, the maximum flame temperature decreases, and the furnace with low oxygen concentration It is described that the combustion reaction is suppressed by the attraction of the internal gas and the flame becomes a long flame, so that a flat furnace temperature distribution required for uniform heating of the material to be heated can be secured and the generation of NOx can be suppressed.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、特開平
８−２８８３０号公報で提案された高温空気バーナは、
ＮＯｘの生成が抑制できるとは言うものの、バーナタイ
ル直近の一次燃焼室内で一次燃焼を行っているので、炉
内のバーナタイル近傍が未だ高温となって、ＮＯｘ抑制
が十分発揮できない。However, the high-temperature air burner proposed in Japanese Patent Application Laid-Open No. 8-28830 is
Although it can be said that the generation of NOx can be suppressed, since the primary combustion is performed in the primary combustion chamber immediately near the burner tile, the temperature near the burner tile in the furnace is still high and the NOx suppression cannot be sufficiently exhibited.
【０００７】本発明は、上記した従来の問題点に鑑みて
なされたものであり、炉内で二段燃焼させると共に、自
己の燃焼排ガスを循環させて、低ＮＯｘ化と高ターン・
ダウン性に優れた単一火炎を形成する高温空気用低ＮＯ
ｘバーナを提供することを目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and performs two-stage combustion in a furnace and circulates its own combustion exhaust gas to reduce NOx and increase turnover.
Low NO for high-temperature air that forms a single flame with excellent down characteristics
It is intended to provide x burners.
【０００８】[0008]
【課題を解決するための手段】上記した目的を達成する
ために、本発明の高温空気用低ＮＯｘバーナは、燃料ノ
ズルを、内周部の燃料通路と外周部の冷却空気通路の二
重管構成すると共に、バッフルに形成する複数の一次空
気供給孔を、入口から出口に向けて同一ピッチ円直径の
面内において、３０〜５０°の角度を付けた構成として
いる。このようにすることで、冷却空気によってノズル
の冷却を行うと共に、燃料ノズルの先端で冷却空気と混
合して最適な噴射速度に増した後、一次空気供給孔から
旋回を寄与された一次空気は噴出口部を経て炉内に至
り、二次空気と混合して燃焼する。そして、この燃焼排
ガスは前記増速された燃料と一次空気の旋回流の作用に
より、自己再循環流をおこし、火炎の安定化を図る。In order to achieve the above object, a low NOx burner for high temperature air according to the present invention comprises a fuel nozzle having a double pipe having a fuel passage in an inner peripheral portion and a cooling air passage in an outer peripheral portion. In addition, a plurality of primary air supply holes formed in the baffle are formed to have an angle of 30 to 50 ° in a plane having the same pitch circle diameter from the inlet to the outlet. In this way, while cooling the nozzle with the cooling air and mixing with the cooling air at the tip of the fuel nozzle to increase the optimal injection speed, the primary air that has been swirled from the primary air supply hole is It reaches the inside of the furnace via the spout and mixes with the secondary air to burn. The flue gas generates a self-recirculating flow by the action of the swirling flow of the fuel and the primary air, thereby stabilizing the flame.
【０００９】[0009]
【発明の実施の形態】本発明の高温空気用低ＮＯｘバー
ナは、燃料を噴射する燃料ノズルの先端部にバッフルを
外嵌状に取り付けると共に、このバッフルの外周にスリ
ット状の二次空気供給孔を形成した構成であり、前記燃
料ノズルは、内周部を燃料通路とし、外周部を冷却空気
通路とした二重管構成され、また、バッフルは、中心に
燃料と冷却空気の噴出孔あるいは燃料ノズルの貫通孔を
設けると共に、この噴出孔あるいは貫通孔の外周側に
は、入口から出口に向けて同一ピッチ円直径の面内にお
いて、３０〜５０°の角度を付けた複数の一次空気供給
孔を設け、かつ、これら噴出孔あるいは貫通孔と一次空
気供給孔の出口に燃料、冷却空気、一次空気の噴出口部
を形成しているのである。DESCRIPTION OF THE PREFERRED EMBODIMENTS A low NOx burner for high-temperature air according to the present invention has a baffle externally fitted to the tip of a fuel nozzle for injecting fuel and a slit-shaped secondary air supply hole formed on the outer periphery of the baffle. The fuel nozzle is formed as a double pipe having an inner peripheral portion as a fuel passage and an outer peripheral portion as a cooling air passage, and the baffle has a fuel and cooling air ejection hole or fuel at the center. A nozzle through-hole is provided, and a plurality of primary air supply holes formed at an angle of 30 to 50 ° in the plane of the same pitch circle diameter from the inlet to the outlet on the outer peripheral side of the ejection hole or the through-hole. And an outlet for fuel, cooling air, and primary air is formed at the outlet of the outlet or through-hole and the primary air supply hole.
【００１０】本発明の高温空気用低ＮＯｘバーナは、燃
料とノズルを冷却した後の冷却空気と混合されて、噴射
速度を６０〜１００ｍ／秒に増速される。そして、燃料
ノズルの先端から冷却空気と共に噴射された燃料は、バ
ッフルの噴出口部で複数の一次空気供給孔から噴射した
一次空気によって旋回を与えられて炉内に至り、二次空
気供給孔から噴射した二次空気と炉内で混合して燃焼す
る。[0010] The low NOx burner for high temperature air of the present invention is mixed with fuel and cooling air after cooling the nozzle, and the injection speed is increased to 60 to 100 m / sec. Then, the fuel injected together with the cooling air from the tip of the fuel nozzle is swirled by the primary air injected from the plurality of primary air supply holes at the outlet of the baffle, reaches the inside of the furnace, and from the secondary air supply hole. It mixes with the injected secondary air in the furnace and burns.
【００１１】本発明の高温空気用低ＮＯｘバーナにおい
て、一次空気供給孔を入口から出口に向けて同一ピッチ
円直径の面内において、３０〜５０°の角度を付けたの
は、炉内での燃焼促進と自己再循環流をより一層高め、
低空気比燃焼と低ＮＯｘ化を図るためである。本発明者
らの実験では、３０°未満では効果がなく、また、５０
°を超えるとバッフルを製造できない。また、５０°に
近づくほど低ＮＯｘ化が図れることを確認している。In the low NOx burner for high-temperature air of the present invention, the primary air supply hole is formed at an angle of 30 to 50 ° in a plane having the same pitch circle diameter from the inlet to the outlet in a furnace having the same pitch. Further enhance combustion promotion and self-recirculation flow,
This is to achieve low air ratio combustion and low NOx. In our experiments, there was no effect at less than 30 °, and
If it exceeds °, baffles cannot be manufactured. Also, it has been confirmed that NOx reduction can be achieved as the angle approaches 50 °.
【００１２】また、本発明の高温空気用低ＮＯｘバーナ
において、バッフルに形成する噴出口部はストレート状
であっても、出口側を絞った形状であってもよい。この
噴出口部の形状は、使用する燃料の種類によって適宜選
択するもので、例えばコークス炉ガス（ＣＯＧ）のよう
に着火速度の速いガスの場合には、旋回流の速度をより
速くして噴出口部で燃焼するのを防止するために、噴出
口部の出口側を絞ったものを使用する。一方、例えばＬ
ＰＧのように、着火速度があまり速くないガスの場合に
は、ストレート状の噴出口部のものを使用する。In the low NOx burner for high-temperature air of the present invention, the injection port formed in the baffle may be straight or may have a shape in which the outlet side is narrowed. The shape of the jet port portion is appropriately selected depending on the type of fuel used. For example, in the case of a gas having a high ignition speed such as coke oven gas (COG), the speed of the swirling flow is increased to jet the gas. In order to prevent burning at the outlet, use an outlet with a narrowed outlet. On the other hand, for example, L
In the case of a gas whose ignition speed is not so fast, such as PG, a gas having a straight outlet portion is used.
【００１３】本発明の高温空気用低ＮＯｘバーナにおい
ては、一次空気供給孔と二次空気供給孔の総断面積の比
（一次空気供給孔：二次空気供給孔）は、低ＮＯｘ化の
観点からは、２０：８０〜４０：６０の間、特に４０：
６０とすることが望ましい。但し、制約された狭い空間
で燃焼させる場合は、一次空気供給孔の断面積比をさら
に小さくすることが望ましい。また、本発明の高温空気
用低ＮＯｘバーナにおいて供給する冷却空気量は、一次
空気及び二次空気を合わせた総空気量の２〜５％とする
のが望ましい。本発明者らの実験では、冷却空気量が５
％を超えると、混合気の噴出速度が高速になりすぎて、
燃焼が不安定になるからである。また、２％未満では冷
却効果がないからである。[0013] In the low NOx burner for high-temperature air of the present invention, the ratio of the total cross-sectional area of the primary air supply hole to the secondary air supply hole (primary air supply hole: secondary air supply hole) depends on the viewpoint of reducing NOx. From 20:80 to 40:60, especially 40:80
Desirably, it is 60. However, when burning in a restricted narrow space, it is desirable to further reduce the sectional area ratio of the primary air supply holes. The amount of cooling air supplied to the low NOx burner for high-temperature air of the present invention is desirably 2 to 5% of the total air amount of the primary air and the secondary air. In our experiments, the cooling air volume was 5
%, The jet speed of the mixture becomes too high,
This is because combustion becomes unstable. Also, if it is less than 2%, there is no cooling effect.
【００１４】[0014]
【実施例】以下、本発明の高温空気用低ＮＯｘバーナを
図１〜図３に示す実施例に基づいて説明する。図１は本
発明の高温空気用低ＮＯｘバーナの第１実施例を示し、
（ａ）は縦断面して示す正面図、（ｂ）は（ａ）図の矢
視Ａ−Ａ図、図２は本発明の高温空気用低ＮＯｘバーナ
の第２実施例を示し、（ａ）は縦断面して示す正面図、
（ｂ）は（ａ）図の矢視Ｂ−Ｂ図、図３は本発明の高温
空気用低ＮＯｘバーナの構成要素である燃料ノズルを拡
大して示す縦断面正面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A low NOx burner for high-temperature air according to the present invention will be described below with reference to the embodiments shown in FIGS. FIG. 1 shows a first embodiment of a low NOx burner for hot air of the present invention,
(A) is a front view showing a longitudinal section, (b) is a view taken along the line AA of (a), FIG. 2 shows a second embodiment of the low NOx burner for high-temperature air of the present invention, ) Is a front view shown in vertical section,
(B) is a BB view of FIG. (A), and FIG. 3 is an enlarged longitudinal sectional front view showing a fuel nozzle which is a component of the low NOx burner for high temperature air of the present invention.
【００１５】図１及び図２において、１１は本発明の高
温空気用低ＮＯｘバーナであり、図１は例えばＬＰＧや
ＬＮＧのような着火速度があまり速くない燃料を使用す
るのに適したもの、図２は例えばＣＯＧのような着火速
度が速い燃料を使用するのに適したものを示している。1 and 2, reference numeral 11 denotes a low NOx burner for hot air of the present invention, and FIG. 1 shows a low NOx burner suitable for using a fuel whose ignition speed is not so fast, such as LPG and LNG. FIG. 2 shows one suitable for using a fuel having a fast ignition speed such as COG.
【００１６】１２は例えばＬＰＧやＣＯＧ等の燃料を噴
射する燃料ノズルであり、二重管構成されている。そし
て、内周の中心部を燃料通路１２ａと、また、外周の環
状空間を冷却空気通路１２ｂとし、この冷却空気通路１
２ｂの外側は耐火物１２ｃで覆っている。Numeral 12 denotes a fuel nozzle for injecting a fuel such as LPG or COG, which has a double pipe structure. The center of the inner periphery is a fuel passage 12a, and the outer annular space is a cooling air passage 12b.
The outside of 2b is covered with a refractory 12c.
【００１７】１３は前記燃料ノズル１２の先端部に外嵌
状に取り付けたバッフルで、例えばアルミナ等の耐火物
で構成され、図１に示す第１実施例では、中心に燃料と
冷却空気の噴出孔１３ａを、また、図２に示す第２実施
例では、中心に燃料ノズル１２の貫通孔１３ｂを設けて
いる。そして、この噴出孔１３ａあるいは貫通孔１３ｂ
の外周側には、入口から出口に向けて同一のピッチ円直
径の面内において、例えば３０°の角度を付けた６個の
一次空気供給孔１３ｃを設けると共に、これら噴出孔１
３ａあるいは貫通孔１３ｂと一次空気供給孔１３ｃの出
口に燃料、冷却空気、一次空気の噴出口部１３ｄを形成
している。Reference numeral 13 denotes a baffle which is attached to the tip of the fuel nozzle 12 so as to be fitted around the fuel nozzle 12 and is made of a refractory material such as alumina. In the first embodiment shown in FIG. The hole 13a is provided, and in the second embodiment shown in FIG. 2, a through hole 13b of the fuel nozzle 12 is provided at the center. Then, the ejection hole 13a or the through hole 13b
Are provided with six primary air supply holes 13c at an angle of, for example, 30 ° in a plane having the same pitch circle diameter from the inlet to the outlet.
An outlet 13d for fuel, cooling air, and primary air is formed at the outlet of 3a or the through hole 13b and the primary air supply hole 13c.
【００１８】ところで、前記噴出孔１３ａは、図１に示
す実施例では先端（噴出口部１３ｄ）側に向かって中央
部まで縮径し、その後はストレート状に形成したものを
示している。また、噴出口部１３ｄは、図１に示す実施
例ではストレート状に形成されたものを、また、図２に
示す実施例では中央部を縮径し、基端側と先端側はスト
レート状に形成したものを示している。この図２に示す
中央部を縮径した噴出口部１３ｄを採用したものでは、
冷却空気によって増速され、バッフル１３の噴出口部１
３ｄで複数の一次空気供給孔１３ｃから噴射した一次空
気によって旋回を与えられた燃料は、図１に示すストレ
ート状のものよりも、流速が増速されて炉内に至るの
で、ＣＯＧのように着火速度が速い燃料に適している。By the way, in the embodiment shown in FIG. 1, the ejection hole 13a is reduced in diameter toward the front end (injection portion 13d) to the center, and thereafter formed in a straight shape. In the embodiment shown in FIG. 1, the outlet 13d is formed in a straight shape. In the embodiment shown in FIG. 2, the diameter of the central portion is reduced, and the base end and the distal end are formed in a straight shape. Shows what was formed. In the case of adopting the ejection port portion 13d in which the diameter of the central portion shown in FIG. 2 is reduced,
The speed of the baffle 13 is increased by the cooling air.
The fuel swirled by the primary air injected from the plurality of primary air supply holes 13c in 3d has a higher flow rate than the straight fuel shown in FIG. 1 and reaches the inside of the furnace. Suitable for fuels with fast ignition speed.
【００１９】１４は前記したバッフル１３の外周とバー
ナタイル１５の間に形成したスリット状の二次空気供給
孔であり、本実施例では４つ設けたものを示している。
１６は入口１８から供給された燃焼用空気を昇温して高
温空気となす蓄熱室であり、例えばアルミナのボール１
６ａが多数充填されている。そして、この蓄熱室１６で
昇温された高温空気は、通路１７を通って前記した一次
空気供給孔１３ｃ及び二次空気供給孔１４に導かれる。Reference numeral 14 denotes a slit-shaped secondary air supply hole formed between the outer periphery of the baffle 13 and the burner tile 15. In this embodiment, four secondary air supply holes are provided.
Numeral 16 denotes a heat storage chamber for raising the temperature of the combustion air supplied from the inlet 18 to form high-temperature air.
6a are filled in large numbers. The high-temperature air heated in the heat storage chamber 16 is guided to the primary air supply holes 13c and the secondary air supply holes 14 through the passages 17.
【００２０】上記した本発明の高温空気用低ＮＯｘバー
ナ１１において、一次空気供給孔１３ｃと二次空気供給
孔１４の総断面積の比（一次空気供給孔：二次空気供給
孔）は、例えば４０：６０となるように設定されてい
る。また、噴出口部１３ｄの内径をｄ1 、長さをＬ1 、
二次空気供給孔１４のピッチ円直径をＤ1 とした場合、
本発明の高温空気用低ＮＯｘバーナ１１においては、Ｄ
1 ／ｄ1 は１．５〜１．８と、また、Ｌ1 ／ｄ1 は０．
５〜１とすることが、低ＮＯｘ化と高ターン・ダウン性
の点からは望ましいが、特にこれらの範囲に限定するも
のではない。In the above-described low NOx burner 11 for high temperature air of the present invention, the ratio of the total sectional area of the primary air supply holes 13c and the secondary air supply holes 14 (primary air supply hole: secondary air supply hole) is, for example, The ratio is set to be 40:60. Further, the inner diameter of the ejection opening 13d d 1, the length L 1,
If the pitch circle diameter of the secondary air supply hole 14 and the D 1,
In the low NOx burner 11 for high temperature air of the present invention, D
1 / d 1 and 1.5-1.8, also, L 1 / d 1 is 0.
A value of 5 to 1 is desirable from the viewpoints of low NOx and high turn-down, but is not particularly limited to these ranges.
【００２１】本発明の高温空気用低ＮＯｘバーナ１１は
上記したような構成であり、次に例えば図１に示す高温
空気用低ＮＯｘバーナ１１を用いて火炎を形成する場合
について説明する。燃料通路１２ａから高カロリーのＬ
ＰＧを、また、冷却空気通路１２ｂから冷却空気を、ま
た、燃焼用空気の入口１８から燃焼用空気を供給する。
この時、冷却空気通路１２ｂに供給される冷却空気量
は、入口１８から供給される空気量の例えば２％が供給
される。The low NOx burner 11 for high temperature air of the present invention has the above-described configuration. Next, a case where a flame is formed by using the low NOx burner 11 for high temperature air shown in FIG. 1 will be described. High calorie L from fuel passage 12a
PG, cooling air is supplied from the cooling air passage 12b, and combustion air is supplied from the combustion air inlet 18.
At this time, as the amount of cooling air supplied to the cooling air passage 12b, for example, 2% of the amount of air supplied from the inlet 18 is supplied.
【００２２】燃料通路１２ａから供給されたＬＰＧは、
冷却空気通路１２ｂから供給された冷却空気によって増
速され、燃料ノズル１２の先端から噴射速度を例えば６
０ｍ／秒で噴射される。The LPG supplied from the fuel passage 12a is
The speed is increased by the cooling air supplied from the cooling air passage 12b, and the injection speed is increased from the tip of the fuel nozzle 12 to, for example, 6
Injected at 0 m / sec.
【００２３】そして、燃料ノズル１２の先端から冷却空
気によって増速された状態で噴射された燃料は、バッフ
ル１３の噴出口部１３ｄで、前記入口１８から供給さ
れ、蓄熱室１６で例えば１０００℃に昇温されて複数の
一次空気供給孔１３ｃから噴射した一次空気によって旋
回を与えられて炉内に至り、同じく前記蓄熱室１６で１
０００℃に昇温されて二次空気供給孔１４から噴射した
二次空気と炉内で混合して燃焼する。The fuel injected from the tip of the fuel nozzle 12 at a speed increased by the cooling air is supplied from the inlet 18 at an outlet 13 d of the baffle 13, and is cooled to, for example, 1000 ° C. in the heat storage chamber 16. The temperature is raised and swirled by the primary air injected from the plurality of primary air supply holes 13c to reach the inside of the furnace.
The temperature is raised to 000 ° C. and mixed with the secondary air injected from the secondary air supply hole 14 in the furnace and burned.
【００２４】燃焼後の排ガスは、前記した燃料と一次空
気の旋回流の作用により自己再循環流をおこし、火炎の
安定を図る。すなわち、本発明の高温空気用低ＮＯｘバ
ーナ１１は、自己の燃焼排ガスを循環し、炉内で二段燃
焼して単一の火炎を形成するので、図４に示すように、
従来型のバーナを使用した場合と比較して、最高火炎温
度が低くなり、かつ、従来型のバーナのように、バーナ
内の燃焼室６内で燃焼するのではなく、炉内で燃焼する
ので、バーナタイル近傍の火炎温度も極端に低くなる。
従って、図５に示すように、従来型のバーナを使用した
場合と比較してＮＯｘが大幅に低下した。The post-combustion exhaust gas generates a self-recirculating flow by the action of the swirling flow of the fuel and the primary air to stabilize the flame. That is, the low-NOx burner 11 for high-temperature air of the present invention circulates its own combustion exhaust gas and performs two-stage combustion in the furnace to form a single flame, as shown in FIG.
As compared with the case of using a conventional burner, the maximum flame temperature is lower, and the fuel is burned in the furnace, not in the combustion chamber 6 in the burner as in the conventional burner. Also, the flame temperature near the burner tile becomes extremely low.
Therefore, as shown in FIG. 5, NOx was significantly reduced as compared with the case where the conventional burner was used.
【００２５】なお、図４及び図５は燃料としてＣＯＧを
使用し、図２に示すバーナを使用した場合の結果であ
る。また、従来型のバーナは図６に示した構成である。
図６中に付した符号のうち、図１、図２と同一の符号は
同一部分あるいは相当部分を示す。FIGS. 4 and 5 show the results when COG is used as the fuel and the burner shown in FIG. 2 is used. Further, the conventional burner has the configuration shown in FIG.
6, the same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts.
【００２６】本実施例では、前記した一次空気供給孔１
３ｃ及び二次空気供給孔１４への高温空気の供給は、同
一の蓄熱室１６から同一の通路１７を経て行うものを示
し、一次空気供給孔１３ｃ及び二次空気供給孔１４への
空気供給量は、一次空気供給孔１３ｃと二次空気供給孔
１４の総断面積比で調整するものを示したが、これに限
るものではなく、一次空気と二次空気、別々に蓄熱室と
通路を備えたものであってもよい。In this embodiment, the primary air supply hole 1
The supply of high-temperature air to the primary air supply hole 13c and the secondary air supply hole 14 indicates that the supply of high-temperature air to the primary air supply hole 13c and the secondary air supply hole 14 is performed through the same passage 17 from the same heat storage chamber 16. Has shown the one that is adjusted by the total cross-sectional area ratio of the primary air supply hole 13c and the secondary air supply hole 14, but the present invention is not limited to this, and the primary air and the secondary air are separately provided with a heat storage chamber and a passage. May be used.
【００２７】また、本実施例では燃料として気体燃料を
使用したものについて説明したが、燃料の搬送に問題が
なければ、液体燃料を使用したり、微粉炭等の固体燃料
を使用してもよいことは勿論である。また、本実施例で
はバッフル１３として耐火物製のものを示したが、耐熱
性と耐スポーリング性が良好なものであれば、金属製の
ものであってもよい。Although the present embodiment has been described using gaseous fuel as fuel, liquid fuel or solid fuel such as pulverized coal may be used as long as there is no problem in fuel transportation. Of course. In this embodiment, the baffle 13 is made of a refractory material, but may be made of a metal as long as it has good heat resistance and spalling resistance.
【００２８】[0028]
【発明の効果】以上説明したように、本発明の高温空気
用低ＮＯｘバーナでは、自己の燃焼排ガスを循環させて
炉内で二段燃焼するので、火炎の最高温度が低くなると
共に、バーナタイルの近傍での火炎温度も低くなる。従
って、これらにより、低ＮＯｘ化と高ターン・ダウン性
が可能となる。As described above, in the low NOx burner for high temperature air of the present invention, the combustion exhaust gas is circulated and the combustion is performed in two stages in the furnace, so that the maximum temperature of the flame is lowered and the burner tile is burned. The flame temperature in the vicinity of becomes lower. Therefore, these enable reduction of NOx and high turn-down property.
【図１】本発明の高温空気用低ＮＯｘバーナの第１実施
例を示し、（ａ）は縦断面して示す正面図、（ｂ）は
（ａ）図の矢視Ａ−Ａ図である。1A and 1B show a first embodiment of a low NOx burner for high-temperature air according to the present invention, wherein FIG. 1A is a front view showing a vertical cross section, and FIG. 1B is an AA view of FIG. .
【図２】本発明の高温空気用低ＮＯｘバーナの第２実施
例を示し、（ａ）は縦断面して示す正面図、（ｂ）は
（ａ）図の矢視Ｂ−Ｂ図である。2A and 2B show a second embodiment of a low NOx burner for high-temperature air according to the present invention, wherein FIG. 2A is a front view showing a vertical cross section, and FIG. 2B is a BB view of FIG. .
【図３】本発明の高温空気用低ＮＯｘバーナの構成要素
である燃料ノズルを拡大して示す縦断面正面図である。FIG. 3 is an enlarged longitudinal sectional front view showing a fuel nozzle which is a component of the low NOx burner for high-temperature air of the present invention.
【図４】本発明の高温空気用低ＮＯｘバーナを使用した
場合と、図６に示す従来型のバーナを使用した場合の、
バーナタイル先端からの距離と火炎温度の関係を示す図
である。4 shows a case where a low NOx burner for hot air of the present invention is used and a case where a conventional burner shown in FIG. 6 is used.
It is a figure which shows the relationship between the distance from a burner tile front-end, and a flame temperature.
【図５】本発明の高温空気用低ＮＯｘバーナを使用した
場合と、図６に示す従来型のバーナを使用した場合の、
空気温度とＮＯｘとの関係を示す図である。5 shows a case where a low NOx burner for hot air of the present invention is used and a case where a conventional burner shown in FIG. 6 is used.
It is a figure which shows the relationship between air temperature and NOx.
【図６】従来型のバーナを縦断面して示す正面図であ
る。FIG. 6 is a front view showing a conventional burner in a longitudinal section.
【図７】特開平８−２８８３０号公報で提案された高温
空気バーナを縦断面して示す正面図である。FIG. 7 is a front view showing a high-temperature air burner proposed in Japanese Patent Application Laid-Open No. 8-28830 in a longitudinal section.
１１ 高温空気用低ＮＯｘバーナ １２ 燃料ノズル １２ａ 燃料通路 １２ｂ 冷却空気通路 １３ バッフル １３ａ 噴出孔 １３ｂ 貫通孔 １３ｃ 一次空気供給孔 １３ｄ 噴出口部 １４ 二次空気供給孔 11 Low NOx burner for high temperature air 12 Fuel nozzle 12a Fuel passage 12b Cooling air passage 13 Baffle 13a Jet hole 13b Through hole 13c Primary air supply hole 13d Jet outlet 14 Secondary air supply hole
───────────────────────────────────────────────────── フロントページの続き (72)発明者 志保 治和 大阪府大阪市中央区北浜４丁目５番33号 住友金属工業株式会社内 (72)発明者 矢葺 邦弘 和歌山県和歌山市湊1850番地 住金マネジ メント株式会社熱流体事業部内 (72)発明者 北村 篤信 大阪府大阪市西区南堀江一丁目２−14 ロ ザイ工業株式会社内 (72)発明者 内本 武 大阪府大阪市西区南堀江一丁目２−14 ロ ザイ工業株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Haruka Shiho 4-5-33 Kitahama, Chuo-ku, Osaka City, Osaka Prefecture Inside Sumitomo Metal Industries, Ltd. (72) Inventor Kunihiro Yahata 1850 Minato, Wakayama-shi, Wakayama Sumikin Management Co., Ltd. Thermal Fluid Division (72) Inventor Atsunobu Kitamura 2-14 Minamihorie, Nishi-ku, Osaka-shi, Osaka Prefecture Rosai Industry Co., Ltd. (72) Takeshi Uchimoto 1-chome, Minamihorie, Nishi-ku, Osaka, Osaka 2-14 Inside Rosai Industry Co., Ltd.
Claims (1)
ッフルを外嵌状に取り付けると共に、このバッフルの外
周にスリット状の二次空気供給孔を形成した構成であ
り、前記燃料ノズルは、内周部を燃料通路とし、外周部
を冷却空気通路とした二重管構成され、また、バッフル
は、中心に燃料と冷却空気の噴出孔あるいは燃料ノズル
の貫通孔を設けると共に、この噴出孔あるいは貫通孔の
外周側には、入口から出口に向けて同一ピッチ円直径の
面内において、３０〜５０°の角度を付けた複数の一次
空気供給孔を設け、かつ、これら噴出孔あるいは貫通孔
と一次空気供給孔の出口に燃料、冷却空気、一次空気の
噴出口部を形成したことを特徴とする高温空気用低ＮＯ
ｘバーナ。1. A fuel nozzle for injecting fuel, wherein a baffle is externally fitted to a tip of the fuel nozzle, and a secondary air supply hole having a slit shape is formed on an outer periphery of the baffle. The baffle is provided with a fuel and cooling air ejection hole or a fuel nozzle through hole at the center, and the ejection hole or the penetration hole is provided at the center of the baffle. On the outer peripheral side of the hole, a plurality of primary air supply holes are formed at an angle of 30 to 50 ° in a plane having the same pitch circle diameter from the inlet to the outlet, and these outlet holes or through holes are connected to the primary air supply holes. Low NO for high-temperature air, characterized in that an outlet for fuel, cooling air and primary air is formed at the outlet of the air supply hole.
x burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34698796A JP3590495B2 (en) | 1996-12-26 | 1996-12-26 | Low NOx burner for high temperature air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34698796A JP3590495B2 (en) | 1996-12-26 | 1996-12-26 | Low NOx burner for high temperature air |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10185128A true JPH10185128A (en) | 1998-07-14 |
| JP3590495B2 JP3590495B2 (en) | 2004-11-17 |
Family
ID=18387167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34698796A Expired - Lifetime JP3590495B2 (en) | 1996-12-26 | 1996-12-26 | Low NOx burner for high temperature air |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3590495B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107062226A (en) * | 2017-05-23 | 2017-08-18 | 北京市热力集团有限责任公司 | A kind of big backflow low NO of high-temperature flue gas |
| KR20180093790A (en) | 2017-02-14 | 2018-08-22 | 쥬가이로 고교 가부시키가이샤 | Fuel Nozzle Cooling System In Regenerative Burner |
-
1996
- 1996-12-26 JP JP34698796A patent/JP3590495B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180093790A (en) | 2017-02-14 | 2018-08-22 | 쥬가이로 고교 가부시키가이샤 | Fuel Nozzle Cooling System In Regenerative Burner |
| CN107062226A (en) * | 2017-05-23 | 2017-08-18 | 北京市热力集团有限责任公司 | A kind of big backflow low NO of high-temperature flue gas |
| CN107062226B (en) * | 2017-05-23 | 2023-10-17 | 北京市热力集团有限责任公司 | High-temperature flue gas large-backflow low-nitrogen combustor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3590495B2 (en) | 2004-11-17 |
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