JPS61134517A - Gas pressure injection type combustion unit - Google Patents

Abstract

PURPOSE:To make a superior keeping of flame when an exclusive gas combustion is performed and improve a performance of combustion by a method wherein a sub-gas nozzle for supplying fuel gas and a sub-injection hole are arranged. CONSTITUTION:Fuel gas when an exclusive gas combustion is performed is injected from a main injection hole 20 and a sub-injection hole 22. Fuel gas injected from the sub-injection hole 22 strikes against a striking surface 23 of a projection 24 to cause a flow speed to be decreased, and at the same time en eddy current condition is formed due to a merging of the surrounding air from the circumference of the sub-injection hole and then kept. In this case, a main flame generated at an injection area of the main injection hole is effectively kept by the sub-flame. When the fuel oil and the fuel gas are ignited under their injected condition, the sub-flame encloses the main flame, the radiation heat from the sub-flame which is ignited in advance is effectively applied to a promotion of gasification of oil drops of the main flame and thus a characteristic of combustion can be improved. Therefore, under an exclusive combustion of fuel gas, almost of all the fuel gas are injected through the main injection hole 20 and a part of it is injected through the sub-injection hole 22. The fuel gas injected from the sub-injection hole 22 strikes against the striking surface 23 of the projection 24 and its flow speed is decreased, it becomes an eddy current state under merging of surrounding air from the circumference of the projection 24, resulting in that a stable sub-flame having no fly of flame can be formed in the injection area of the sub-injection hole 22 and can be kept.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、ガス圧噴霧燃焼器に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to gas pressure atomizing combustors.

［従来の技術］ 都市ガス等の比較的高圧の燃料ガスを霧化媒体として用
いて燃料油を噴霧するガス圧噴霧燃焼方法が、例えば特
開昭５８−１４９５２１　、実開昭５７−１３９１８、
実開昭５８−１４８４３５　、実開昭５８−１４８４３
８等に示されている。このガス圧噴霧燃焼方法は、従来
の蒸気噴霧や高圧空気噴霧燃焼に比較し、（ａ）燃料ガ
スの先行燃焼により燃料油の気化が促進されて燃焼性能
が向上し、低０２、低Ｎ　Ｏ，燃焼が可能となること、
（ｂ）低温度の蒸気もしくは高圧空気を炉内に送り込ま
ずに済むので炉の熱効率が向上すること、（ｃ）低燃焼
負荷でも、霧化媒体比率が大きいため、燃焼性が損なわ
れず、ターンダウン比を大きくとれること等の利点があ
る。このガス圧噴霧燃焼による燃焼負荷特性の特徴は、
燃料ガス供給圧力を一定とし、低燃焼負荷では、ガス専
焼として、ガス側のみの流量制御でターンダウン比を大
きくとるものである。[Prior Art] A gas pressure atomization combustion method in which fuel oil is atomized using relatively high-pressure fuel gas such as city gas as an atomization medium is disclosed in, for example, Japanese Patent Application Laid-open No. 58-149521, Utility Model Application No. 57-13918,
Utility Model 58-148435, Utility Model 58-14843
It is shown in 8th grade. Compared to conventional steam spray or high-pressure air spray combustion, this gas pressure spray combustion method has the following advantages: (a) Vaporization of fuel oil is promoted by preliminary combustion of fuel gas, improving combustion performance, and low 02 and low NO , combustion becomes possible;
(b) There is no need to feed low-temperature steam or high-pressure air into the furnace, which improves the thermal efficiency of the furnace. (c) Even at low combustion loads, the atomization medium ratio is large, so combustibility is not impaired and the It has the advantage of being able to have a large down ratio. The characteristics of the combustion load characteristics due to this gas pressure spray combustion are as follows.
The fuel gas supply pressure is kept constant, and at low combustion loads, gas-only combustion is performed and the turndown ratio is increased by controlling the flow rate only on the gas side.

［発明が解決しようとする問題点］ しかしながら、従来のガス圧噴霧燃焼方法、特に天然ガ
ス系の都市ガスを用いたガス圧噴霧燃焼方法においては
、第４図に示すように、燃料油の噴霧に必要な高い圧力
でそのままガス専焼させると、火炎が吹飛びやすく、保
炎性に問題があり。[Problems to be Solved by the Invention] However, in the conventional gas pressure spray combustion method, especially the gas pressure spray combustion method using natural gas-based city gas, as shown in FIG. If the flame is fired exclusively with gas at the high pressure required for this, the flame will easily blow out and there will be problems with flame retention.

そのため、ガス専焼時だけガス圧力をある程度下げてノ
ズル吐出流速を低くし、火炎の吹飛びを抑える必要があ
る。したがって、ガス専焼から燃料ガスと燃料油の混焼
べ移行する場合、あるいはその逆方向に燃焼負荷が変化
する場合には、燃焼負荷を連続的に変化させることがで
きないため、結果的に燃焼器としてのターンダウン比が
小さく。Therefore, it is necessary to lower the gas pressure to some extent and lower the nozzle discharge flow rate only during gas-only combustion to suppress flame blow-off. Therefore, when transitioning from gas-only combustion to co-combustion of fuel gas and fuel oil, or when the combustion load changes in the opposite direction, the combustion load cannot be changed continuously, and as a result, the combustor The turndown ratio is small.

炉温制御が乱れるという欠点を有している。It has the disadvantage that furnace temperature control is disturbed.

本発明は、ガス専焼時の保炎性を良好化し、燃焼器自体
のターンダウン比を大きくし、燃焼負荷を連続的に変化
させることを可能とするとともに、あわせて燃焼性能自
体を向上させることを目的とする。The present invention improves flame stability during gas-only combustion, increases the turndown ratio of the combustor itself, makes it possible to continuously change the combustion load, and at the same time improves the combustion performance itself. With the goal.

［問題点を解決するための手段］ 本発明は、燃料油を供給する油ノズルと、燃料ガスを供
給する主ガスノズルとを混合ノズルに連通し、燃料油と
燃料ガスを混合状態で噴出する主噴出孔を混合ノズルの
先端に形成してなるガス圧噴霧燃焼器において、燃料ガ
スを供給する副ガスノズルを設け、副ガスノズルの先端
に形成される副噴射孔を、主噴射孔の周囲に配置し、主
噴射孔を臨み、副噴射孔から噴出する燃料ガスが衝突す
る衝突面を備えてなる突起部を、副噴射孔の噴出方向の
延長線相当位置に設けるようにしたものである。[Means for Solving the Problems] The present invention provides a main gas nozzle that communicates an oil nozzle that supplies fuel oil and a main gas nozzle that supplies fuel gas with a mixing nozzle to eject fuel oil and fuel gas in a mixed state. In a gas pressure spray combustor in which an injection hole is formed at the tip of a mixing nozzle, a sub-gas nozzle for supplying fuel gas is provided, and the sub-injection hole formed at the tip of the sub-gas nozzle is arranged around the main injection hole. A protrusion facing the main injection hole and having a collision surface with which fuel gas ejected from the sub injection hole collides is provided at a position corresponding to the extension line of the injection direction of the sub injection hole.

［作　用］ 本発明によれば、ガス専焼時の燃料ガスは、主噴出孔か
ら噴出されるとともに、副噴出孔からも噴出される。こ
こで、副噴出孔から噴出される燃料ガスは突起部の衝突
面に当って流速が低下する＆＆＋′Ｅ・突起部６辺″″
″１１７）′ｌｉ！！空気０巻′９８　１により、渦流
状態を形成され、副噴出孔の噴出領域に吹飛びを生ずる
ことのない安定な副火炎を形成、保持することとなる。[Function] According to the present invention, fuel gas during gas-only combustion is ejected from the main ejection hole and also from the sub-ejection hole. Here, the fuel gas ejected from the sub-nozzle hits the collision surface of the protrusion and the flow velocity decreases.
``117)'li!! 0 volumes of air '98 1 forms a vortex state, forming and maintaining a stable secondary flame that does not blow away in the ejection area of the secondary ejection hole.

そこで、主噴出孔の噴出領域に生ずる主火炎が、上記副
火炎によって有効に保炎可能とされる。また、燃料油と
燃料ガスの噴霧燃焼時には、副噴出孔の噴出領域に形成
される副火炎が主噴出孔の噴出領域に形成される主火炎
を包み込み、先行燃焼する副火炎からの！晶射熱が主火
炎の油滴の気化促進に有効に作用し、燃メを性能自体を
向上可能とする。Therefore, the main flame generated in the ejection area of the main ejection hole can be effectively flame-stabilized by the auxiliary flame. Furthermore, during spray combustion of fuel oil and fuel gas, the auxiliary flames formed in the ejection area of the auxiliary nozzle wrap around the main flame formed in the ejection area of the main nozzle, and the auxiliary flame that burns in advance! The crystal radiation heat effectively acts to accelerate the vaporization of oil droplets in the main flame, making it possible to improve the performance of the flame itself.

［実施例Ｊ 第１図は本発明の一実施例に係るガス圧噴霧燃焼器１０
を示す断面図、第２図は第１図の正面図である。Embodiment J FIG. 1 shows a gas pressure spray combustor 10 according to an embodiment of the present invention.
FIG. 2 is a front view of FIG. 1.

ガス圧噴霧燃焼器１０は、相互に２重管構造を形成する
オイルガン外管１１とオイルガン内管１２の先端部に、
アトマイザ（バーナチップ）１３を配設している。すな
わち、アトマイザ１３は、上記外管１１と内管１２の両
者に螺合するキャップ１４によって外管１１と結合する
とともに、内管１２に直接的に螺合している。ここで、
外管１１と内管１２の間には燃料油供給通路１５が形成
され、内管１２には燃料ガス供給通路１６が形成されて
いる。The gas pressure spray combustor 10 includes an oil gun outer pipe 11 and an oil gun inner pipe 12, each of which has a double-pipe structure.
An atomizer (burner chip) 13 is provided. That is, the atomizer 13 is connected to the outer tube 11 by means of a cap 14 that is screwed to both the outer tube 11 and the inner tube 12, and is directly screwed to the inner tube 12. here,
A fuel oil supply passage 15 is formed between the outer tube 11 and the inner tube 12, and a fuel gas supply passage 16 is formed in the inner tube 12.

アトマイザ１３には、燃料油供給通路１５に連通ずる油
ノズル１７、燃料ガス供給通路１６に連通ずる主ガスノ
ズル１８、混合ノズル１９が形成されている。すなわち
、燃焼器１０は、燃料油を供給する油ノズル１７と、燃
料ガスを供給する主ガスノズル１８とを混合ノズル１９
に連通し、燃料油と燃料ガスを混合状態で噴出する主噴
出孔２０を混合ノズル１９の先端に形成している。なお
、混合ノズル１９は、アトマイザ１３の軸心部に形成さ
れている。The atomizer 13 is formed with an oil nozzle 17 communicating with the fuel oil supply passage 15, a main gas nozzle 18 communicating with the fuel gas supply passage 16, and a mixing nozzle 19. That is, in the combustor 10, the oil nozzle 17 that supplies fuel oil and the main gas nozzle 18 that supplies fuel gas are connected to the mixing nozzle 19.
A main ejection hole 20 is formed at the tip of the mixing nozzle 19, which communicates with the main ejection port 20 and ejects fuel oil and fuel gas in a mixed state. Note that the mixing nozzle 19 is formed at the axial center of the atomizer 13.

しかして、燃焼器１０は、アトマイザ１３における、主
ガスノズル１８および混合ノズル１９の周囲の周方向３
等配位置に、燃料ガス供給通路１６に連通し、燃料ガス
を供給する副ガスノズル２１を設（すている、これによ
り、燃焼器１０は、アトマイザ１３における主噴出孔２
０の開口位置の周囲の周方向３等配位置に、副ガスノズ
ル２１の先端に形成される副噴出孔２２を配置している
。ここで、副ガスノズル２１の孔径は、主ガスノズル１
８の孔径に比して十分小さく設定され、主ガスノズル１
８から油の霧化用として噴出される燃料ガスの運動量を
損なうことのないように配慮されている、 また、燃焼器ｌＯは、主噴出孔２０を臨み、１噴出孔２
２から噴出する燃料ガスが衝突する衝突面２３を備えて
なる突起部２４を、キャップ１４の先端部にお（する各
１噴出孔２ｚの噴出方向の延長線相当位置に設けている
。なお、キャー２プ１４の先端周縁部を周方向に連続し
た円環状とせずに、周方向に不連続な突起部２４を設（
すだのは、１噴出孔２２かう噴出する燃料ガス流が突起
のない部分から周囲空気を巻き込むことを意図したもの
である。Thus, the combustor 10 has three parts in the circumferential direction around the main gas nozzle 18 and the mixing nozzle 19 in the atomizer 13.
Sub-gas nozzles 21 that communicate with the fuel gas supply passage 16 and supply fuel gas are provided at equal positions.
The sub-ejection holes 22 formed at the tip of the sub-gas nozzle 21 are arranged at three equally spaced positions in the circumferential direction around the opening position 0. Here, the hole diameter of the secondary gas nozzle 21 is the same as that of the main gas nozzle 1.
The hole diameter of main gas nozzle 1 is set sufficiently small compared to the hole diameter of main gas nozzle 1.
The combustor IO faces the main nozzle 20, and the combustor 1O faces the main nozzle 20, and the combustor 1O faces the main nozzle 20.
A protrusion 24 comprising a collision surface 23 with which fuel gas ejected from the cap 14 collides is provided at the tip of the cap 14 at a position corresponding to the extension line in the ejection direction of each ejection hole 2z. Instead of making the tip peripheral edge of the cap 14 continuous in the circumferential direction, a discontinuous protrusion 24 is provided in the circumferential direction (
The sudan is intended for the fuel gas flow ejected from each nozzle hole 22 to draw in the surrounding air from a portion without protrusions.

次に、１記実施例の作用について説明する。Next, the operation of the first embodiment will be explained.

燃焼器１０において、燃料油は第１図に矢印Ａで示すよ
うに燃料油供給通路１５から油ノズル１７を通り、また
霧化用の燃料ガスは矢印Ｂで示すように燃料ガス供給通
路１６から主ガスノズル１８を通り、それぞれ混合ノズ
ル１９に導かれて相互に混合され、主噴出孔２０から微
粒化された状態で噴出可能とされている。また、燃料ガ
スの一部は、燃料ガス供給通路１６から副ガスノズル２
１を通り、１噴出孔ｚ２から突起部２４の衝突面２３に
向けて噴出可能とされている。In the combustor 10, fuel oil passes from a fuel oil supply passage 15 through an oil nozzle 17 as shown by arrow A in FIG. 1, and fuel gas for atomization passes from a fuel gas supply passage 16 as shown by arrow B. The gases pass through the main gas nozzle 18, are guided to the mixing nozzle 19, are mixed with each other, and can be ejected from the main ejection hole 20 in an atomized state. Further, a part of the fuel gas is transferred from the fuel gas supply passage 16 to the sub gas nozzle 2.
1 and can be ejected from one ejection hole z2 toward the collision surface 23 of the protrusion 24.

しかして、ガス専焼時の燃料ガスは、大部分が主噴出孔
２０から噴出されるが、一部が１噴出孔２２から噴出さ
れる。この１噴出孔２２から噴出される燃料ガスは突起
部２４の衝突面２３に当って流速が低下するとともに、
突起部２４の周辺からの周囲空気の巻き込みにより、渦
流状態を形成され、１噴出孔２ｚの噴出領域に吹飛びを
生ずることのない安定な副火炎を形成、保持可能とする
。これにより、主噴出孔２０の噴出領域に生ずる主火炎
は、上記１噴出孔２２の噴出領域に形成される副火炎に
よって有効に保炎可能とされる。Thus, most of the fuel gas during gas-only combustion is ejected from the main ejection hole 20, but a portion is ejected from the first ejection hole 22. The fuel gas ejected from this one ejection hole 22 hits the collision surface 23 of the protrusion 24, and the flow velocity decreases.
The entrainment of ambient air from the periphery of the protrusion 24 forms a vortex state, making it possible to form and maintain a stable secondary flame that does not blow away in the ejection region of one ejection hole 2z. Thereby, the main flame generated in the ejection area of the main ejection hole 20 can be effectively flame-stabilized by the auxiliary flame formed in the ejection area of the one ejection hole 22.

なお、副ガスノズル２１および１噴出孔２２が設　　　
１けられていない場合には、特に天然ガス系の都市ガス
を用いる場合に、主噴出孔２０の噴出領域に形成される
主火炎がガス専焼時に吹飛び易く保炎性に不都合を生ず
る。In addition, the sub gas nozzle 21 and the first ejection hole 22 are installed.
If this is not the case, the main flame formed in the ejection region of the main ejection hole 20 is likely to blow off during gas-only combustion, causing problems in flame stability, especially when using natural gas-based city gas.

また、燃料油と燃料ガスの噴霧燃焼時には、１噴出孔２
２の噴出領域に形成される副火炎が、主噴出孔２０の噴
出領域に形成される主火炎を包み込み、先行燃焼する副
火炎からの輻射熱を主火炎の油滴の気化促進に有効に作
用させることにより、燃焼性能自体を向上させ、低過剰
空気燃焼、。Also, during spray combustion of fuel oil and fuel gas, 1 nozzle 2
The auxiliary flames formed in the ejection area of the main ejection hole 20 enclose the main flame formed in the ejection area of the main ejection hole 20, and the radiant heat from the auxiliary flames that burn in advance is used to effectively promote the vaporization of oil droplets in the main flame. Low excess air combustion, thereby improving combustion performance itself.

ばいじん等の濃度低下に寄与可能とする。It can contribute to reducing the concentration of soot and dust.

以下、本発明の具体的実施結果について説明する。上記
実施例によるガス圧噴霧燃焼器１０を、燃焼容量２２．
４Ｘ　１０　　ｋｃａｌ／時間の燃焼器に適用した。使
用燃料油はＣ重油であり、霧化媒体には天然ガス系都市
ガス１３Ａを用いた。ガス圧力は１．５ｋｇ　／ａｍ’
Ｇで作動し、燃焼負荷２５％以下でガス専焼焚とした。Hereinafter, specific implementation results of the present invention will be explained. The gas pressure spray combustor 10 according to the above embodiment has a combustion capacity of 22.
It was applied to a 4X 10 kcal/hour combustor. The fuel oil used was C heavy oil, and natural gas city gas 13A was used as the atomization medium. Gas pressure is 1.5kg/am'
It operates at G, and burns exclusively with gas at a combustion load of 25% or less.

ガス専焼時のガス圧力を１．５ｋｇ／ｃｎｆＧより　０
．５ｋｇ／ｃｒｒｒ’Ｇまで流量制御することにより、
ターンダウン比１：１５が連続的に実現できた。また、
ガス圧噴霧燃焼時、先行燃焼する副火炎からの輻射熱が
主火炎の油滴の気化促進に有効に働き、それによって燃
焼性が向上し、従来の蒸気または高圧空気噴霧の場合よ
りも低過剰空気燃焼が可能となった。（０２＝１％にて
連続燃焼可能）。Gas pressure during gas-only combustion from 1.5kg/cnfG 0
．． By controlling the flow rate up to 5kg/crrr'G,
A turndown ratio of 1:15 was continuously achieved. Also,
During gas pressure spray combustion, the radiant heat from the pre-combusting auxiliary flame works effectively to accelerate the vaporization of oil droplets in the main flame, thereby improving combustibility and reducing excess air at a lower level than in the case of conventional steam or high-pressure air atomization. Combustion became possible. (Continuous combustion possible at 02=1%).

上記本発明に係るガス圧噴霧燃焼器によれば以下の効果
を得ることが可能である。すなわち、（ａ）ガス専焼時
、軸心上の主噴出孔２０より生ずる主火炎を、その外周
に位置する１噴出孔２２により形成される副火炎により
有効に保炎し、油の霧化に必要な高い圧力にてそのまま
燃料ガスを供給しても安定燃焼することが可能となり、
燃料ガスと燃料油の混焼時から燃料ガス専焼時へ移行す
る場合、あるいはその逆方向で燃焼負荷が変化する場合
にも、第３図に示すように、燃焼負荷を連続的に円滑に
変化させることが可能となり、燃焼器のターンダウン比
を大きく取ることが可能となる。（ｂ）さらに、従来、
連続的に燃焼負荷を変化させることができなかったこと
に起因する炉温制御の乱れを解消可能である。（Ｃ）ま
た、ガス圧噴霧燃焼時には、先行燃焼する燃料ガスの副
火炎からの４晶射熱が主火炎の油滴の気化促進に有効に
作用し、燃焼性能自体が向上し、低過剰空気燃焼、ばい
じん等の潤度低下に寄与する。According to the gas pressure spray combustor according to the present invention, the following effects can be obtained. That is, (a) during gas-only combustion, the main flame generated from the main ejection hole 20 on the axis is effectively flame-stabilized by the auxiliary flame formed by the one ejection hole 22 located on the outer periphery, and the oil is atomized. Stable combustion is possible even if fuel gas is supplied as is at the required high pressure.
Even when the combustion load changes from co-combustion of fuel gas and fuel oil to exclusive combustion of fuel gas, or vice versa, the combustion load is continuously and smoothly changed as shown in Figure 3. This makes it possible to increase the turndown ratio of the combustor. (b) Furthermore, conventionally,
Disturbances in furnace temperature control caused by not being able to continuously change the combustion load can be eliminated. (C) Also, during gas pressure spray combustion, the 4-crystal radiation heat from the auxiliary flames of the fuel gas that is pre-combusted acts effectively to promote the vaporization of oil droplets in the main flame, improving combustion performance itself and reducing excess air. Combustion, dust, etc. contribute to a decrease in moisture content.

［発明の効果］ 以上のように、本発明は、燃料油を供給する油ノズルと
、燃料ガスを供給する主ガスノズルとを混合ノズルに連
通し、燃料油と燃料ガスを混合状態で噴出する主噴出孔
を混合ノズルの先端に形成してなるガス圧噴霧燃焼器に
おいて、燃料ガスを供給する副ガスノズルを設け、副ガ
スノズルの先端に形成される副噴射孔を、主噴射孔の周
囲に配置し、主噴射孔を臨み、副噴射孔から噴出する燃
料ガスが衝突する衝突面を備えてなる突起部を、副噴射
孔の噴出方向の延長線相当位置に設けるようにしたもの
である。したがって、ガス専焼時の保炎性を良好化し、
燃焼器自体のターンダウン比を大きくし、燃焼負荷を連
続的に変化させることが可能となるとともに、あわせて
燃焼性能自体を向上させることも可能となる。[Effects of the Invention] As described above, the present invention connects an oil nozzle that supplies fuel oil and a main gas nozzle that supplies fuel gas to a mixing nozzle, and provides a main gas nozzle that spouts fuel oil and fuel gas in a mixed state. In a gas pressure spray combustor in which an injection hole is formed at the tip of a mixing nozzle, a sub-gas nozzle for supplying fuel gas is provided, and the sub-injection hole formed at the tip of the sub-gas nozzle is arranged around the main injection hole. A protrusion facing the main injection hole and having a collision surface with which fuel gas ejected from the sub injection hole collides is provided at a position corresponding to the extension line of the injection direction of the sub injection hole. Therefore, flame stability during gas-only combustion is improved,
It becomes possible to increase the turndown ratio of the combustor itself and continuously change the combustion load, and at the same time, it becomes possible to improve the combustion performance itself.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例に係るガス圧噴霧燃焼器を示
す断面図、第２図は第１図の正面図、第３図は本発明に
よるガス圧噴霧燃焼の燃焼負荷特性を示す線図、第４図
は従来のガス圧噴霧燃焼による燃焼負荷特性を示す線図
である。 １０・・・ガス圧噴霧燃焼器、１７・・・油ノズル、１
８・・・主ガスノズル、１９・・・混合ノズル、２０・
・・主噴出孔、２１・・・副ガスノズル、２２・・・１
噴出孔、２３・・・衝突面、２４・・・突起部。 代理人　　弁理士　　塩　川　修　治 第１図 第３図　　　　　　　第４図Fig. 1 is a sectional view showing a gas pressure spray combustor according to an embodiment of the present invention, Fig. 2 is a front view of Fig. 1, and Fig. 3 shows combustion load characteristics of gas pressure spray combustion according to the present invention. FIG. 4 is a diagram showing combustion load characteristics due to conventional gas pressure spray combustion. 10... Gas pressure spray combustor, 17... Oil nozzle, 1
8... Main gas nozzle, 19... Mixing nozzle, 20...
...Main nozzle, 21...Sub-gas nozzle, 22...1
Nozzle hole, 23... Collision surface, 24... Projection. Agent Patent Attorney Osamu Shiokawa Figure 1 Figure 3 Figure 4

Claims (1)

【特許請求の範囲】[Claims] （１）燃料油を供給する油ノズルと、燃料ガスを供給す
る主ガスノズルとを混合ノズルに連通し、燃料油と燃料
ガスを混合状態で噴出する主噴出孔を混合ノズルの先端
に形成してなるガス圧噴霧燃焼器において、燃料ガスを
供給する副ガスノズルを設け、副ガスノズルの先端に形
成される副噴射孔を、主噴射孔の周囲に配置し、主噴射
孔を臨み、副噴射孔から噴出する燃料ガスが衝突する衝
突面を備えてなる突起部を、副噴射孔の噴出方向の延長
線相当位置に設けたことを特徴とするガス圧噴霧燃焼器
。(1) An oil nozzle for supplying fuel oil and a main gas nozzle for supplying fuel gas are connected to a mixing nozzle, and a main ejection hole for ejecting fuel oil and fuel gas in a mixed state is formed at the tip of the mixing nozzle. In the gas pressure spray combustor, a sub-gas nozzle for supplying fuel gas is provided, and the sub-injection hole formed at the tip of the sub-gas nozzle is arranged around the main injection hole, facing the main injection hole, and from the sub-injection hole. A gas pressure spray combustor characterized in that a protrusion comprising a collision surface with which jetted fuel gas collides is provided at a position corresponding to an extension line of a sub-injection hole in the jetting direction.