JPH0989218A - Spray burner - Google Patents
Spray burnerInfo
- Publication number
- JPH0989218A JPH0989218A JP27174695A JP27174695A JPH0989218A JP H0989218 A JPH0989218 A JP H0989218A JP 27174695 A JP27174695 A JP 27174695A JP 27174695 A JP27174695 A JP 27174695A JP H0989218 A JPH0989218 A JP H0989218A
- Authority
- JP
- Japan
- Prior art keywords
- air
- combustion cylinder
- combustion
- downstream
- swirling
- 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.)
- Pending
Links
- 239000007921 spray Substances 0.000 title claims abstract description 35
- 238000002485 combustion reaction Methods 0.000 claims abstract description 92
- 239000000446 fuel Substances 0.000 claims abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 11
- 239000000567 combustion gas Substances 0.000 claims description 21
- 238000005507 spraying Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 239000000243 solution Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 3
- 244000171022 Peltophorum pterocarpum Species 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Landscapes
- Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、噴霧燃焼器に関す
る。TECHNICAL FIELD The present invention relates to a spray combustor.
【０００２】[0002]
【従来の技術】従来の噴霧燃焼器として、図９に示す燃
焼器がある。この燃焼器は、保炎器の中心孔7aを通って
送り込まれる空気と、保炎器の本体である旋回羽根７を
通って送り込まれる空気とを供給し、また別の空気を燃
焼筒30の内周面の孔30a から燃焼器の中心軸Ｘに向かっ
て送り込み、また燃料噴射弁８から噴射された燃料は保
炎器の中心孔7aを通して空気と共に燃焼空間に供給する
ようにしている。ところが、このタイプの噴霧燃焼器に
よって形成される火炎は、黄色火炎であり、局所的な高
温領域が多く存在し、多量のＮＯX が排出されるという
問題を有していた。そこで、本願出願人は、更に図６、
図７、図８の示す噴霧燃焼器を提案した。図６は従来装
置の縦断面構成図で、図７は図６のＫ−Ｋ断面図、図８
は図６のＬ−Ｌ断面図である。この装置は、燃焼筒40
と、該燃焼筒40の基端面を構成するように配置された旋
回羽根７と、該旋回羽根７の中心部の中心孔7aを介して
燃料を燃焼筒40内に噴霧する噴霧燃料噴射弁８とを有
し、燃焼筒40の側壁には燃焼筒40の中心軸Ｘに向かう向
芯方向とある旋回角度をもって円周上に多数開口されて
なる２次旋回空気孔群41、42を上流側から下流側にかけ
て多段に亘って配すると共に、該多段の２次旋回空気孔
群41、42の少なくとも一段の旋回方向を旋回羽根７の旋
回方向に対して逆方向になるように構成し、２次旋回空
気孔群41、42の各段の間にはそれぞれ空気絞りリング盤
43、44を設けると共にその空気絞りリング盤43、44のリ
ング内径が上流のものから下流のものになるにつれて次
第に大きくなるように構成し、旋回羽根７の中心孔7aか
ら燃料と共に燃焼筒40内に導入される空気及びその周り
の旋回羽根７を介して燃焼筒40内に旋回導入される空気
とを１次空気とし、多段の２次旋回空気孔群41、42から
燃焼筒40内に旋回導入される空気を２次空気とした噴霧
燃焼器である。上記した図６〜図８に図示する噴霧燃焼
器によれば、旋回羽根７の中心孔7aから燃料と共に燃焼
筒40内に導入される空気及びその周りの旋回羽根７を介
して燃焼筒40内に旋回導入される空気とからなる１次空
気に対して、多段の２次旋回空気孔群41、42から燃焼筒
40内に旋回導入される２次空気が作用し、また空気絞り
リング盤43、44により空気の流れが絞られることで、こ
れらの相互作用により、燃料噴霧粒子のガス化が促進さ
れ、火炎基部の混合が活発になり、火炎が青みを帯びた
不輝炎になりやすく、その結果、局所的な高温領域が形
成されにくくなるため、ＮＯX の発生量を抑える効果が
ある。2. Description of the Related Art As a conventional spray combustor, there is a combustor shown in FIG. This combustor supplies the air sent through the central hole 7a of the flame stabilizer and the air sent through the swirl vane 7 which is the main body of the flame stabilizer, and also supplies another air to the combustion tube 30. The fuel is injected from the hole 30a on the inner peripheral surface toward the central axis X of the combustor, and the fuel injected from the fuel injection valve 8 is supplied to the combustion space together with air through the central hole 7a of the flame stabilizer. However, the flame formed by this type of spray combustor is a yellow flame, and there are many local high temperature regions, and there is a problem that a large amount of NO X is discharged. Therefore, the applicant of the present application further refers to FIG.
A spray combustor shown in FIGS. 7 and 8 was proposed. FIG. 6 is a vertical cross-sectional configuration diagram of a conventional device, FIG. 7 is a cross-sectional view taken along the line KK of FIG.
FIG. 7 is a sectional view taken along line L-L in FIG. 6. This device is a combustion cylinder 40
And a swirl vane 7 arranged so as to form the base end surface of the combustion cylinder 40, and a spray fuel injection valve 8 for spraying fuel into the combustion cylinder 40 through a central hole 7a at the center of the swirl blade 7. And a plurality of secondary swirling air hole groups 41 and 42 formed on the side wall of the combustion cylinder 40 and having a large number of openings on the circumference at a certain swirl angle with respect to the central axis X of the combustion cylinder 40 on the upstream side. From the downstream side to the downstream side, and the swirling direction of at least one stage of the secondary swirling air hole groups 41 and 42 of the multistage is configured to be opposite to the swirling direction of the swirling blade 7. An air throttle ring machine is installed between each stage of the next swirling air hole groups 41 and 42.
43, 44 are provided, and the inner diameters of the air throttle ring disks 43, 44 are configured to gradually increase from upstream to downstream, and the center hole 7a of the swirl vane 7 and the fuel inside the combustion cylinder 40 The air introduced into the combustion tube 40 and the air swirled into the combustion tube 40 through the swirl vanes 7 around the air are used as primary air, and swirled into the combustion tube 40 from the multistage secondary swirling air hole groups 41 and 42. This is a spray combustor in which the introduced air is secondary air. According to the spray combustor illustrated in FIGS. 6 to 8 described above, the air introduced into the combustion cylinder 40 from the central hole 7a of the swirl vane 7 together with the fuel and the swirl vanes 7 around the air inside the combustion cylinder 40 For the primary air consisting of the air swirled and introduced into the combustion cylinder from the multistage secondary swirling air hole groups 41, 42
The secondary air swirled and introduced into the chamber 40 acts, and the flow of the air is throttled by the air throttle ring discs 43 and 44, whereby the interaction of these promotes the gasification of the fuel spray particles and the flame base portion. Mixing becomes active, and the flame is likely to become a bluish blazing flame, and as a result, a local high-temperature region is less likely to be formed, which has the effect of suppressing the amount of NO X generated.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記図
６〜図８に示す従来の噴霧燃焼器では、火炎の基部では
混合が活発となって不輝炎になりやすくなるが、その後
流では、混合気の流速が遅くなり、黄色火炎が大きく広
がり、高温領域が広がる傾向にあった。そしてその結
果、排出されるＮＯX 濃度値は低くはなるものの、今一
つ十分な効果は得られなかった。However, in the conventional spray combustor shown in FIG. 6 to FIG. 8, the mixing becomes active at the base of the flame and the flame is apt to become a dazzling flame. The flow velocity of air slowed down, the yellow flame spread widely, and the high temperature region tended to spread. The result, although low is NO X concentration value exhausted, one more sufficient effect was not obtained.
【０００４】そこで本発明は上記従来技術の欠点を解消
し、良好な燃焼が行えると共に燃焼に際してのＮＯX の
発生を低減させることができる噴霧燃焼器の提供を目的
とする。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a spray combustor which can solve the above-mentioned drawbacks of the prior art and can perform good combustion and can reduce the generation of NO X during combustion.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するた
め、本発明の噴霧燃焼器は、燃焼筒と、該燃焼筒の基端
面を構成するように配置された旋回羽根と、該旋回羽根
の中心部の中心孔を介して燃料を燃焼筒内に噴霧する燃
料噴射弁とを有し、前記燃焼筒の側壁には燃焼筒の中心
軸に向かう向芯方向とある旋回角度をもって円周上に多
数開口されてなる２次旋回空気孔群を上流側から下流側
にかけて多段に亘って配すると共に、該多段の２次旋回
空気孔群の少なくとも一段の旋回方向を前記旋回羽根の
旋回方向に対して逆方向になるように構成し、前記２次
旋回空気孔群の各段の下流にそれぞれ対応して空気絞り
リング盤を設けると共にその空気絞りリング盤のリング
内径が上流のものから下流のものになるにつれて次第に
大きくなるように構成し、前記旋回羽根の中心孔から燃
料と共に燃焼筒内に導入される空気及びその周りの前記
旋回羽根を介して燃焼筒内に旋回導入される空気とを１
次空気とし、多段の２次旋回空気孔群から燃焼筒内に旋
回導入される空気を２次空気とした噴霧燃焼器におい
て、前記多段の２次旋回空気孔群の下流の燃焼筒側壁
に、向芯空気孔群を円周上の分割された複数位置に設け
たことを第１の特徴としている。また本発明の噴霧燃焼
器は、上記第１の特徴に加えて、向芯空気孔群の下流の
燃焼筒の拡大段部に、燃焼筒の中心軸と平行な方向に空
気を吹き出す補助空気孔群を、円周上の前記各向芯空気
孔群の中間位置に設けていることを第２の特徴としてい
る。また本発明の噴霧燃焼器は、上記第２の特徴に加え
て、補助空気孔群の下流の燃焼筒の側壁に、燃焼ガス循
環孔を設けていることを第３の特徴としている。In order to achieve the above object, a spray combustor of the present invention comprises a combustion cylinder, a swirl vane arranged to form a base end face of the combustion cylinder, and a swirl vane of the swirl vane. A fuel injection valve for spraying fuel into the combustion cylinder through a central hole in the center, and the side wall of the combustion cylinder has a gyration direction toward the central axis of the combustion cylinder and a certain turning angle on the circumference. A large number of secondary swirling air hole groups are arranged in multiple stages from the upstream side to the downstream side, and at least one swirling direction of the multi-stage secondary swirling air hole groups is set with respect to the swirling direction of the swirl vanes. So as to be in the opposite direction, and an air throttle ring disk is provided corresponding to each downstream of each stage of the secondary swirling air hole group, and the inner diameter of the air throttle ring disk is from upstream to downstream. As it grows And, an air that is swirling introduced into the swirling combustion cylinder through the wings of the air and around is introduced into the swirling combustion cylinder with fuel from a central hole of the blade 1
In a spray combustor in which secondary air is secondary air, which is swirl-introduced into the combustion cylinder from a multi-stage secondary swirling air hole group, in the combustion cylinder side wall downstream of the multi-stage secondary swirling air hole group, The first feature is that the eccentric air hole groups are provided at a plurality of divided positions on the circumference. In addition to the first feature, the spray combustor of the present invention has, in addition to the first feature, an auxiliary air hole that blows out air in a direction parallel to the central axis of the combustion cylinder in an enlarged step portion of the combustion cylinder downstream of the eccentric air hole group. A second feature is that the group is provided at an intermediate position of each eccentric air hole group on the circumference. In addition to the above-mentioned second characteristic, the spray combustor of the present invention has a third characteristic that a combustion gas circulation hole is provided on the side wall of the combustion cylinder downstream of the auxiliary air hole group.
【０００６】上記第１の特徴によれば、燃料噴射弁によ
って旋回羽根の中心孔から燃焼筒内に噴霧される燃料
と、旋回羽根の中心孔から燃料と共に燃焼筒内に導入さ
れる空気及びその周りの前記旋回羽根を介して燃焼筒内
に旋回導入される空気とからなる１次空気と、多段の２
次旋回空気孔群から燃焼筒内に旋回導入される空気から
なる２次空気とによって火炎が構成される。が、この火
炎は、更に向芯空気孔群から吹き込まれる空気流によ
り、円周方向に複数の火炎に分割せられる。これによっ
て火炎の高温領域も複数に分割せられ、ＮＯX の発生量
を抑制することができる。また上記第２の特徴によれ
ば、前記向芯空気孔群から吹き込まれる空気流によって
複数の領域（向芯空気孔群のない領域）に分割されて広
がった火炎は、向芯空気孔群の下流の燃焼筒の拡大段部
に設けられた補助空気孔群から吹き出される空気によっ
て更に燃焼せられる。補助空気孔群は円周上の前記各向
芯空気孔群の中間位置に設けられているので、丁度分割
された火炎と一致した位置となる。また上記第３の特徴
によれば、補助空気孔群の下流の燃焼筒の側壁に、燃焼
ガス循環孔を設けることで、補助空気孔群からの空気流
により、燃焼ガス循環孔の付近を負圧にすることがで
き、よって一旦燃焼した燃焼ガスを再び前記燃焼ガス循
環孔から燃焼筒内に循環させて前記補助空気孔群からの
空気流と混合させ、再燃焼させることが容易となり、自
己排ガス循環によるＮＯX の発生量を抑えることができ
る。According to the first feature, the fuel injected by the fuel injection valve from the central hole of the swirl vane into the combustion cylinder, the air introduced into the combustion cylinder together with the fuel from the central hole of the swirl vane, and the air Primary air composed of air swirlingly introduced into the combustion cylinder through the swirling vanes around the swirling vane, and multi-stage two
A flame is formed by the secondary swirling air hole group and the secondary air that is swirlingly introduced into the combustion cylinder. However, this flame is further divided into a plurality of flames in the circumferential direction by the air flow blown from the eccentric air hole group. This high-temperature region of the flame also being divided into a plurality, it is possible to suppress the generation amount of NO X. Further, according to the second feature, the flame that is divided into a plurality of regions (regions without the group of directional air holes) and spread by the airflow blown from the group of directional air holes is Further combustion is performed by the air blown from the auxiliary air hole group provided in the enlarged step portion of the downstream combustion cylinder. Since the auxiliary air hole group is provided at an intermediate position on the circumference of each of the eccentric air hole groups, the auxiliary air hole group is located at a position that coincides with the flame just divided. Further, according to the third feature, by providing the combustion gas circulation hole on the side wall of the combustion cylinder downstream of the auxiliary air hole group, the vicinity of the combustion gas circulation hole is negatively affected by the air flow from the auxiliary air hole group. Therefore, the combustion gas once burned can be circulated again from the combustion gas circulation hole into the combustion cylinder to be mixed with the air flow from the auxiliary air hole group and easily re-combusted. it is possible to suppress the generation amount of the NO X by the exhaust gas circulation.
【０００７】[0007]
【発明の実施の形態】図１は本発明の実施の形態を示す
噴霧燃焼器の縦断面構成図、図２は図１に示す噴霧燃焼
器の左側面図、図３は図１に示す噴霧燃焼器のＡ−Ａ断
面図、図４は図１に示す噴霧燃焼器のＢ−Ｂ断面図、図
５は図１に示す噴霧燃焼器のＣ−Ｃ断面図である。1 is a vertical cross-sectional view of a spray combustor showing an embodiment of the present invention, FIG. 2 is a left side view of the spray combustor shown in FIG. 1, and FIG. 3 is a spray shown in FIG. FIG. 4 is a sectional view taken along the line AA of the combustor, FIG. 4 is a sectional view taken along the line BB of the spray combustor shown in FIG. 1, and FIG. 5 is a sectional view taken along the line CC of the spray combustor shown in FIG.
【０００８】ノズル取付フランジ１の一方の面に、円管
状の１次空気筒２と、該１次空気筒２に所定間隔をあけ
て外嵌する円管状の空気整流筒３と、該空気整流筒３に
所定間隔をあけて外嵌する外筒４とが取り付けられてお
り、外筒４の外周部には燃焼空気供給用ファン５が取り
付けられている。１次空気筒２は、一端部に先すぼまり
状のコーン部2aを一体にして有しており、他端部がノズ
ル取付フランジ１に嵌合している。１次空気筒２のコー
ン部2a側には、旋回羽根取付板６の一端部が嵌合してい
る。旋回羽根取付板６の他端円盤部6aは燃焼筒20の基端
面を構成すると共に旋回羽根７が一体して形成されてい
る。旋回羽根７の中心孔7aは、１次空気筒２の中心孔2b
と嵌合している。前記１次空気筒２には空気整流孔2cが
設けられ、空気整流筒３には空気整流孔3aが設けられ、
外筒４には空気導入孔4aが設けられている。On one surface of the nozzle mounting flange 1, a circular primary air cylinder 2, a circular cylindrical air rectifying cylinder 3 which is fitted on the primary air cylinder 2 at a predetermined interval, and the pneumatic rectifier. An outer cylinder 4 which is fitted onto the cylinder 3 at a predetermined interval is attached, and a combustion air supply fan 5 is attached to the outer peripheral portion of the outer cylinder 4. The primary air cylinder 2 integrally has a conical portion 2a having a tapered shape at one end, and the other end is fitted to the nozzle mounting flange 1. One end of the swirl vane mounting plate 6 is fitted to the cone portion 2a side of the primary air cylinder 2. The other end disk portion 6a of the swirl vane mounting plate 6 constitutes the base end surface of the combustion cylinder 20 and the swirl vanes 7 are integrally formed. The central hole 7a of the swirl vane 7 is the central hole 2b of the primary air cylinder 2.
It is fitted with. The primary air cylinder 2 is provided with an air rectifying hole 2c, the air rectifying cylinder 3 is provided with an air rectifying hole 3a,
The outer cylinder 4 is provided with an air introduction hole 4a.
【０００９】前記１次空気筒２内には燃焼器の中心軸Ｘ
上に燃料噴射弁８が配置され、中心孔7aの手前の位置か
ら燃焼筒20内へ臨んでいる。また１次空気筒２内にはイ
グナイタ９が配置され、燃料噴射弁８から噴霧された燃
料に点火する。１次空気筒２内は第１の空気室10とされ
ている。同様に、１次空気筒２のコーン部2aと旋回羽根
取付板６との間に構成される空間が第２の空気室11とさ
れている。また１次空気筒２と空気整流筒３との間が第
３の空気室12とされている。この第３の空気室12から前
記第２の空気室11へ導入口11a が設けられている。更に
空気整流筒３と外筒４との間が第４の空気室13とされて
いる。燃焼空気供給用ファン５からの空気流は空気導入
孔4aから外筒４内の第４の空気室13に入り、更に第４の
空気室13から空気整流孔3aを通って空気整流筒３内の第
３の空気室12に入り、その第３の空気室12から一部は導
入口11a を通って第２の空気室11に入り、他の一部は空
気整流孔2cを通って１次空気筒２内の第１の空気室10に
入る。前記第１の空気室10内の空気は燃料噴射弁８から
の噴霧燃料と一緒にその中心孔7aを通って、燃焼筒20内
に導入される。また前記第２の空気室11内の空気は旋回
羽根７を介して燃焼筒20内に旋回導入される。この第１
の空気室10から中心孔7aを介して燃焼筒20内に導入され
る空気と、前記第２の空気室11から旋回羽根７を介して
燃焼筒20内に旋回導入される空気を１次空気としてい
る。A central axis X of the combustor is provided in the primary air cylinder 2.
The fuel injection valve 8 is arranged above and faces the inside of the combustion cylinder 20 from a position before the center hole 7a. An igniter 9 is arranged in the primary air cylinder 2 to ignite the fuel sprayed from the fuel injection valve 8. The inside of the primary air cylinder 2 serves as a first air chamber 10. Similarly, the space formed between the cone portion 2a of the primary air cylinder 2 and the swirl vane mounting plate 6 is the second air chamber 11. A third air chamber 12 is formed between the primary air cylinder 2 and the air rectifying cylinder 3. An introduction port 11a is provided from the third air chamber 12 to the second air chamber 11. Further, a space between the air rectifying cylinder 3 and the outer cylinder 4 is a fourth air chamber 13. The air flow from the combustion air supply fan 5 enters the fourth air chamber 13 inside the outer cylinder 4 through the air introduction hole 4a, and further passes through the air rectifying hole 3a from the fourth air chamber 13 and inside the air rectifying cylinder 3. Into the third air chamber 12, part of the third air chamber 12 enters the second air chamber 11 through the inlet 11a, and the other part of the third air chamber 12 passes through the air rectifying hole 2c. The first air chamber 10 in the empty cylinder 2 enters. The air in the first air chamber 10 is introduced into the combustion cylinder 20 together with the spray fuel from the fuel injection valve 8 through the center hole 7a. Further, the air in the second air chamber 11 is swirled and introduced into the combustion cylinder 20 via the swirl vanes 7. This first
The air introduced from the air chamber 10 into the combustion cylinder 20 through the center hole 7a and the air swirled from the second air chamber 11 into the combustion cylinder 20 through the swirl vanes 7 are primary air. I am trying.
【００１０】燃焼筒20は第１筒部材20a と第２筒部材20
b と第３筒部材20c と第４筒部材20d と第５筒部材20e
から構成されており、前記旋回羽根７の中心部の中心孔
7aを介して噴霧導入された燃料を燃焼させる室となる筒
である。燃焼筒20の側壁には、前記旋回羽根７に近い基
端側、即ち上流側から下流側にかけて多段に、複数の２
次旋回空気孔群21、22（実施例では２段）をそれぞれ円
周上に配している。この２次旋回空気孔群21、22に属す
る各孔は円周上において中心軸Ｘに向かう向芯方向とは
ある旋回角度をもって切り起こし開口されている。これ
により２次旋回空気孔群21、22から燃焼筒20内に噴出さ
れた空気流は、２次空気として、中心軸Ｘを中心とした
旋回流となる。前記上流から下流にかけて多段に設けら
れた２次旋回空気孔群21、22の内、少なくとも１段につ
いては、その旋回流の旋回方向を前記旋回羽根７から燃
焼筒20内に導入される旋回流の旋回方向と逆にする。実
施例では上流側の２次旋回空気孔群21による旋回流の旋
回方向が旋回羽根７を通って導入される旋回流の旋回方
向と逆になるようにしている。The combustion cylinder 20 includes a first cylinder member 20a and a second cylinder member 20.
b, third cylinder member 20c, fourth cylinder member 20d, and fifth cylinder member 20e
And a central hole in the center of the swirl vane 7.
This is a cylinder that serves as a chamber for burning the fuel that is sprayed and introduced through 7a. On the side wall of the combustion cylinder 20, there are a plurality of two end portions near the swirl vane 7, that is, in multiple stages from the upstream side to the downstream side.
Next swirling air hole groups 21 and 22 (two stages in the embodiment) are arranged on the circumference. The respective holes belonging to the secondary swirling air hole groups 21 and 22 are cut and opened on the circumference at a swirling angle with respect to the eccentric direction toward the central axis X. As a result, the air flow ejected from the secondary swirling air hole groups 21, 22 into the combustion cylinder 20 becomes swirling flow around the central axis X as secondary air. Of at least one of the secondary swirling air hole groups 21, 22 provided in multiple stages from the upstream side to the downstream side, the swirling direction of the swirling flow is introduced from the swirling vanes 7 into the combustion cylinder 20. Reverse the turning direction of. In the embodiment, the swirling direction of the swirling flow by the secondary swirling air hole group 21 on the upstream side is set to be opposite to the swirling direction of the swirling flow introduced through the swirl vanes 7.
【００１１】燃焼筒20の側壁の内面には、前記多段の２
次旋回空気孔群21、22の各段に下流にそれぞれ対応し
て、空気絞りリング盤23、24を設けている（実施例では
２つ）。空気絞りリング盤23、24のリング内径23a 、24
a は前記旋回羽根７の外径よりも大きくし、またリング
内径23a 、24a が上流側の空気絞りリング盤23から下流
側の空気絞りリング盤24になるにつれて次第に大きくな
るようにしている。On the inner surface of the side wall of the combustion cylinder 20, the multi-stage two
Air diaphragm ring disks 23 and 24 are provided downstream of the stages of the next swirling air hole groups 21 and 22, respectively (two in the embodiment). Air diaphragm ring base 23, 24 ring inner diameter 23a, 24
The a is made larger than the outer diameter of the swirl vane 7, and the ring inner diameters 23a and 24a are gradually made larger from the upstream air diaphragm ring disk 23 to the downstream air diaphragm ring disk 24.
【００１２】多段に配された前記空気絞りリング盤23、
24の下流の燃焼筒20の側壁に、複数の向芯空気孔群25を
設けている。各向芯空気孔群25の孔は円周上にあって、
中心軸Ｘに向けて空気を吹き出すように開口されてい
る。複数の向芯空気孔群25は燃焼筒20の側壁の円周上に
おいて、等分割された複数位置に設けられている。本実
施例では６分割された位置にそれぞれ向芯空気孔群25が
設けられている。分割数は４〜８分割とすることができ
る。また実施例では各向芯空気孔群25には３個の孔が設
けられているが、３個に限定されるものではない。上記
のように向芯空気孔群25を燃焼筒20の円周上の複数の分
割された位置に設けることで、この各向芯空気孔群25か
ら燃焼筒20内に吹き込まれる空気流によって、燃焼筒20
内の火炎が円周方向に複数の火炎に分割せられる。これ
によって火炎の高温領域も複数に分割せられ、それぞれ
の高温領域の温度が低下せられる結果、ＮＯX の発生量
を抑制することができる。[0012] The air throttle ring disc 23 arranged in multiple stages,
A plurality of eccentric air hole groups 25 are provided on the side wall of the combustion cylinder 20 downstream of 24. The holes of each eccentric air hole group 25 are on the circumference,
It is opened so as to blow out air toward the central axis X. The plurality of eccentric air hole groups 25 are provided at a plurality of equally divided positions on the circumference of the side wall of the combustion cylinder 20. In this embodiment, the eccentric air hole groups 25 are provided at the six divided positions. The number of divisions can be 4 to 8 divisions. Further, in the embodiment, each directional core air hole group 25 is provided with three holes, but the number is not limited to three. By providing the eccentric air hole group 25 at a plurality of divided positions on the circumference of the combustion cylinder 20 as described above, by the air flow blown into the combustion cylinder 20 from each eccentric air hole group 25, Combustion cylinder 20
The inner flame is divided into multiple flames in the circumferential direction. This high-temperature region of the flame also being divided into a plurality of results of the temperature of each of the high-temperature region is lowered, it is possible to suppress the generation amount of NO X.
【００１３】前記向芯空気孔群25の下流の燃焼筒20の拡
大段部26に中心軸Ｘと平行な方向に空気を吹き出す補助
空気孔群27を設けている。この補助空気孔群27は、円周
上において前記各向芯空気孔群25の中間位置に配置する
ようにする。即ち、補助空気孔群27は向芯空気孔群25と
は同数を交互になるように配されている。実施例では各
補助空気孔群27には３個の孔が設けられているが、３個
に限定されるものではない。各補助空気孔群27から燃焼
筒20内に吹き込まれる空気は、前記向芯空気孔群25によ
って複数の領域に分割された火炎の円周上での位置と丁
度一致し、分割された火炎を更に燃焼させる。An auxiliary air hole group 27 for blowing out air in a direction parallel to the central axis X is provided in the enlarged step portion 26 of the combustion cylinder 20 downstream of the eccentric air hole group 25. The group of auxiliary air holes 27 is arranged on the circumference at an intermediate position between the groups of directional air holes 25. That is, the auxiliary air hole groups 27 are arranged so as to alternate with the eccentric air hole groups 25 in the same number. In the embodiment, each auxiliary air hole group 27 is provided with three holes, but the number is not limited to three. The air blown into the combustion cylinder 20 from each auxiliary air hole group 27 exactly matches the position on the circumference of the flame divided into a plurality of regions by the eccentric air hole group 25, and the divided flame is generated. Further burn.
【００１４】補助空気孔群27の少し下流の燃焼筒20の側
壁に、燃焼ガス循環孔28を設ける。燃焼ガス循環孔28の
位置は円周上の前記各補助空気孔群27の中間位置に配置
するようにする。各補助空気孔群27から燃焼筒20内に吹
き込まれる空気流によって、その補助空気孔群27からの
空気流の間の領域等が負圧傾向となる。これにより下流
の燃焼筒20側壁に開口された燃焼ガス循環孔28に燃焼筒
20内への吸引力が発生することが可能となり、一旦燃焼
した燃焼ガスが再び前記燃焼ガス循環孔28から燃焼筒20
内に自己循環し、前記補助空気孔群27からの空気流と混
合し、再燃焼する。この燃焼ガスの再燃焼によってＮＯ
X の発生量が抑えられる。A combustion gas circulation hole 28 is provided on the side wall of the combustion cylinder 20 slightly downstream of the auxiliary air hole group 27. The position of the combustion gas circulation hole 28 is arranged at an intermediate position between the auxiliary air hole groups 27 on the circumference. Due to the air flow blown into the combustion cylinder 20 from each auxiliary air hole group 27, a region between the air flows from the auxiliary air hole group 27 has a negative pressure tendency. As a result, the combustion cylinder is inserted into the combustion gas circulation hole 28 opened on the side wall of the combustion cylinder 20 on the downstream side.
It is possible to generate suction force into the inside of the combustion cylinder 20, and the combustion gas that has once burned is again discharged from the combustion gas circulation hole 28 into the combustion cylinder 20.
It circulates in the interior, mixes with the air flow from the group of auxiliary air holes 27 and reburns. NO due to re-combustion of this combustion gas
The amount of X generation is suppressed.
【００１５】以上の構成において、運転が開始される
と、燃焼空気供給用ファン５が駆動され、石油等の燃料
が燃料噴射弁８に供給されることで、燃料噴射弁８から
燃料が燃焼筒20内に噴霧され、噴霧と一緒に第１の空気
室10から１次空気が燃焼筒20内に導入され、また第２の
空気室11から旋回羽根７を介して１次空気が旋回導入さ
れ、一方、第２の空気室12から２次旋回空気孔群21、22
を介して２次空気が旋回導入される。そしてこれら噴霧
燃料と１次空気と２次空気とにより火炎が構成される。
そして火炎は、更に向芯空気孔群25から吹き込まれる空
気流により、円周方向に複数の火炎に分割せられる。こ
れによって火炎の高温領域も複数に分割せられて温度の
上昇が抑えられ、ＮＯX の発生量が抑制される。更に前
記複数に分割された各火炎は、その下流で補助空気孔群
27から導入される空気流によって燃焼せられる。一方、
補助空気孔群27から燃焼筒20内に噴出する空気流によっ
て、その下流の燃焼筒20に設けられた燃焼ガス循環孔28
の付近が負圧状態にされ、一旦燃焼した燃焼ガスが燃焼
ガス循環孔28を通って自己循環する。これによって燃焼
ガスの再燃焼が行われ、ＮＯX の発生が抑制される。In the above structure, when the operation is started, the combustion air supply fan 5 is driven and the fuel such as oil is supplied to the fuel injection valve 8, so that the fuel is injected from the fuel injection valve 8 into the combustion cylinder. The primary air is introduced into the combustion cylinder 20 from the first air chamber 10 together with the atomization, and the primary air is swirling introduced from the second air chamber 11 via the swirl vanes 7 together with the atomization. On the other hand, from the second air chamber 12 to the secondary swirling air hole groups 21, 22
The secondary air is swirled and introduced via. A flame is formed by the atomized fuel, the primary air, and the secondary air.
Then, the flame is further divided into a plurality of flames in the circumferential direction by the air flow blown from the eccentric air hole group 25. As a result, the high temperature region of the flame is also divided into a plurality of regions, the rise in temperature is suppressed, and the amount of NO X generated is suppressed. Further, each of the flames divided into the plurality of flames has a group of auxiliary air holes downstream thereof.
It is burned by the air stream introduced from 27. on the other hand,
The combustion gas circulation hole 28 provided in the combustion cylinder 20 downstream of the auxiliary air hole group 27 by the air flow ejected into the combustion cylinder 20.
The vicinity of is brought to a negative pressure state, and the combustion gas once burned circulates through the combustion gas circulation hole 28 by itself. As a result, the combustion gas is re-combusted and the generation of NO X is suppressed.
【００１６】[0016]
【発明の効果】本発明は以上の構成よりなり、請求項１
に記載の噴霧燃焼器によれば、多段の２次旋回空気孔群
の下流の燃焼筒の側壁に、向芯空気孔群を円周上の分割
された複数位置に設けたので、燃焼筒内での火炎を分割
することができ、これによって火炎の高温領域をも分割
して、温度の上昇を防止することができ、ＮＯX の発生
を抑制することができる。また請求項２に記載の噴霧燃
焼器によれば、請求項１に記載の構成による効果に加え
て、向芯空気孔群の下流の燃焼筒の拡大段部に、燃焼筒
の中心軸と平行な方向に空気を吹き出す補助空気孔群
を、円周上の前記各向芯空気孔群の中間位置に設けてい
るので、複数の領域（向芯空気孔群のない領域）に分割
されて広がった火炎を更に燃焼させて完全燃焼へ導くこ
とができる。また請求項３に記載の噴霧燃焼器によれ
ば、請求項２に記載の構成による効果に加えて、補助空
気孔群の下流の燃焼筒の側壁に、燃焼ガス循環孔を設け
ているので、補助空気孔群からの空気流により、燃焼ガ
ス循環孔の付近を負圧にすることができ、よって一旦燃
焼した燃焼ガスを再び前記燃焼ガス循環孔から燃焼筒内
に自己循環させて再燃焼させることが可能となり、ＮＯ
X の発生量を抑えることができる。According to the present invention, there is provided the above construction.
According to the spray combustor described in (1), since the eccentric air hole groups are provided at a plurality of circumferentially divided positions on the side wall of the combustion cylinder downstream of the multistage secondary swirling air hole group, flame can be divided in, thereby to also divide the high-temperature region of the flame, it is possible to prevent an increase in temperature, it is possible to suppress the generation of NO X. According to the spray combustor described in claim 2, in addition to the effect of the configuration described in claim 1, in addition to the effect of the configuration described in claim 1, the central axis of the combustion cylinder is parallel to the enlarged step portion of the combustion cylinder downstream of the group of directional air holes. Since the auxiliary air hole group that blows air in different directions is provided at the intermediate position of each of the directional air hole groups on the circumference, the auxiliary air hole group is divided into a plurality of regions (regions without the directional air hole group) and spreads out. The burned flame can be further burned to lead to complete combustion. According to the spray combustor described in claim 3, in addition to the effect of the configuration described in claim 2, since the combustion gas circulation hole is provided on the side wall of the combustion cylinder downstream of the auxiliary air hole group, Due to the air flow from the auxiliary air hole group, a negative pressure can be made in the vicinity of the combustion gas circulation hole, so that the combustion gas once burned is self-circulated again from the combustion gas circulation hole into the combustion cylinder and reburned. It becomes possible and NO
The amount of X generation can be suppressed.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の実施の形態を示す噴霧燃焼器の縦断面
構成図である。FIG. 1 is a vertical cross-sectional configuration diagram of a spray combustor showing an embodiment of the present invention.
【図２】図１に示す噴霧燃焼器の左側面図である。FIG. 2 is a left side view of the spray combustor shown in FIG.
【図３】図１に示す噴霧燃焼器のＡ−Ａ断面図である。FIG. 3 is a sectional view taken along line AA of the spray combustor shown in FIG.
【図４】図１に示す噴霧燃焼器のＢ−Ｂ断面図である。FIG. 4 is a BB cross-sectional view of the spray combustor shown in FIG.
【図５】図１に示す噴霧燃焼器のＣ−Ｃ断面図である。5 is a cross-sectional view taken along line CC of the spray combustor shown in FIG.
【図６】従来装置の縦断面構成図である。FIG. 6 is a vertical cross-sectional configuration diagram of a conventional device.
【図７】図６のＫ−Ｋ断面図である。FIG. 7 is a sectional view taken along line KK of FIG.
【図８】図６のＬ−Ｌ断面図である。8 is a sectional view taken along line LL in FIG.
【図９】更に他の従来装置の縦断面構成図である。FIG. 9 is a vertical cross-sectional configuration diagram of still another conventional device.
【符号の説明】 ７ 旋回羽根 7a 中心孔 ８ 燃料噴射弁 20 燃焼筒 21、22 ２次旋回空気孔群 23、24 空気絞りリング盤 25 向芯空気孔群 26 拡大段部 27 補助空気孔群 28 燃焼ガス循環孔 Ｘ 中心軸[Explanation of symbols] 7 swirl vane 7a center hole 8 fuel injection valve 20 combustion cylinder 21, 22 secondary swirl air hole group 23, 24 air throttle ring board 25 directional center air hole group 26 expansion step 27 auxiliary air hole group 28 Combustion gas circulation hole X center axis
Claims (3)
ように配置された旋回羽根と、該旋回羽根の中心部の中
心孔を介して燃料を燃焼筒内に噴霧する燃料噴射弁とを
有し、前記燃焼筒の側壁には燃焼筒の中心軸に向かう向
芯方向とある旋回角度をもって円周上に多数開口されて
なる２次旋回空気孔群を上流側から下流側にかけて多段
に亘って配すると共に、該多段の２次旋回空気孔群の少
なくとも一段の旋回方向を前記旋回羽根の旋回方向に対
して逆方向になるように構成し、前記２次旋回空気孔群
の各段の下流にそれぞれ対応して空気絞りリング盤を設
けると共にその空気絞りリング盤のリング内径が上流の
ものから下流のものになるにつれて次第に大きくなるよ
うに構成し、前記旋回羽根の中心孔から燃料と共に燃焼
筒内に導入される空気及びその周りの前記旋回羽根を介
して燃焼筒内に旋回導入される空気とを１次空気とし、
多段の２次旋回空気孔群から燃焼筒内に旋回導入される
空気を２次空気とした噴霧燃焼器において、前記多段の
２次旋回空気孔群の下流の燃焼筒の側壁に、向芯空気孔
群を円周上の分割された複数位置に設けたことを特徴と
する噴霧燃焼器。1. A fuel injection valve for spraying fuel into a combustion cylinder through a combustion cylinder, a swirl vane arranged to form a base end surface of the combustion cylinder, and a central hole in a central portion of the swirl vane. And a plurality of secondary swirling air hole groups formed on the side wall of the combustion cylinder, the secondary swirling air hole groups being opened on the circumference at a certain swirl angle with respect to the central axis of the combustion cylinder from the upstream side to the downstream side. Of the secondary swirling air hole groups, and the swirling direction of at least one stage of the multi-stage secondary swirling air hole group is opposite to the swirling direction of the swirl vanes. An air throttle ring disc is provided corresponding to each of the stages downstream, and the ring inner diameter of the air throttle ring disc is gradually increased from upstream to downstream, and the fuel is fed from the center hole of the swirl vane. Empty introduced into the combustion cylinder together with The air and the air swirlly introduced into the combustion cylinder through the swirl vanes around the air are used as primary air,
In a spray combustor in which the air that is swirlly introduced into the combustion cylinder from the multistage secondary swirling air hole group is used as the secondary air, directional air is provided on the side wall of the combustion cylinder downstream of the multistage secondary swirling air hole group. A spray combustor characterized in that holes are provided at a plurality of divided positions on the circumference.
に、燃焼筒の中心軸と平行な方向に空気を吹き出す補助
空気孔群を、円周上の前記各向芯空気孔群の中間位置に
設けていることを特徴とする請求項１に記載の噴霧燃焼
器。2. An auxiliary air hole group for blowing air in a direction parallel to the central axis of the combustion cylinder is provided at an enlarged step portion of the combustion cylinder downstream of the centering air hole group, and each auxiliary air hole on the circumference is provided. The spray combustor according to claim 1, wherein the spray combustor is provided at an intermediate position of the group.
燃焼ガス循環孔を設けていることを特徴とする請求項２
に記載の噴霧燃焼器。3. The side wall of the combustion cylinder downstream of the group of auxiliary air holes,
3. A combustion gas circulation hole is provided.
A spray combustor as set forth in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27174695A JPH0989218A (en) | 1995-09-25 | 1995-09-25 | Spray burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27174695A JPH0989218A (en) | 1995-09-25 | 1995-09-25 | Spray burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0989218A true JPH0989218A (en) | 1997-04-04 |
Family
ID=17504263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27174695A Pending JPH0989218A (en) | 1995-09-25 | 1995-09-25 | Spray burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0989218A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017067420A (en) * | 2015-10-02 | 2017-04-06 | 長府工産株式会社 | Combustor |
| CN108730978A (en) * | 2018-05-18 | 2018-11-02 | 浙江炬烁热能设备制造有限公司 | The low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove |
| CN109611835A (en) * | 2019-01-08 | 2019-04-12 | 华侨大学 | A multi-stage gas reverse swirling burner |
-
1995
- 1995-09-25 JP JP27174695A patent/JPH0989218A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017067420A (en) * | 2015-10-02 | 2017-04-06 | 長府工産株式会社 | Combustor |
| CN108730978A (en) * | 2018-05-18 | 2018-11-02 | 浙江炬烁热能设备制造有限公司 | The low nitrogen gas burner of self-loopa is adjusted in inner flue gas of the stove |
| CN108730978B (en) * | 2018-05-18 | 2023-11-17 | 浙江炬烁热能设备制造有限公司 | Self-circulation low-nitrogen gas burner with adjustable flue gas in furnace |
| CN109611835A (en) * | 2019-01-08 | 2019-04-12 | 华侨大学 | A multi-stage gas reverse swirling burner |
| CN109611835B (en) * | 2019-01-08 | 2024-02-27 | 华侨大学 | Multistage gas reverse cyclone burner |
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