JPH07318010A - Vaporization combustion burner - Google Patents

Abstract

PURPOSE:To reduce the size of a vaporization combustion burner and increase the output thereof by a method wherein sprayed liquid fuel is heated by combustion gas flowing in a fuel vaporization cylinder from a first combustion gas reflux passage between a burner casing and the fuel vaporization cylinder and a second combustion gas reflux passage between the fuel vaporization cylinder and an air introduction cylinder. CONSTITUTION:After combustion gas from a fuel vaporization cylinder 30 flows in a first combustion gas reflux flow passage 60 through a gap part between the tips of a burner casing 50 and an air introduction cylinder 40, the combustion gas flows into a fuel vaporization cylinder 30 and simultaneously flows into a second combustion gas reflux flow passage 63 through a gap part between the tips of the fuel vaporization cylinder 30 and the burner casing 50 and thereafter, it flows into the combustion cylinder 30. In this case, combustion gas flowing into the fuel combustion cylinder 30 through the first combustion gas reflux flow passage 60 and the second combustion gas reflux passage 63 heats directly fluid fuel from a spray nozzle 11. Further, combustion gas flowing through the second combustion gas reflux passage 63 is heated by a radiant heat also from the fuel vaporization cylinder 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporization combustion burner, and more particularly, to a structure in which a part of combustion gas is recirculated to a fuel vaporization point, and secondary air is provided to a downstream side of the fuel vaporization point. The present invention relates to a vaporization combustion burner having both a configuration for introducing and burning it, and more particularly to a high output vaporization combustion burner applicable to thermal equipment such as a boiler.

[0002]

DESCRIPTION OF THE PRIOR ART As is well known, the most important problems in thermal equipment, combustion exhaust produced during combustion of the fuel, particularly, to how to reduce the harmful emissions such as NO _X or CO It can be said. A general liquid combustion burner sprays liquid fuel such as kerosene, light oil, and heavy oil from a liquid fuel spray nozzle, and burns it while diffusing and mixing it with combustion air. Therefore, in such a burner, atomization of atomized fuel and further insufficient vaporization result in bright flame combustion, which raises the flame temperature, and the NO _x emission amount increases accordingly. . Further, as described above, since the fuel and the combustion air are mixed by diffusion mixing after the fuel is sprayed, it is difficult to uniformly mix the fuel and the combustion air. Therefore, an excessive fuel region is locally generated, and the CO concentration and the soot generation amount increase in this region.

Therefore, as an attempt to positively promote the vaporization of the fuel and improve the combustion performance, JP-A-62-91711 has been proposed.
Although there is a vaporization pot type combustion burner as disclosed in Japanese Patent Publication, it is difficult to maintain stable combustibility because soot easily adheres to the combustion air supply hole and is clogged, and it is arranged near the burner. Adhesion of soot to the flame detection frame rod causes a problem that flame detection performance deteriorates. Further, in this type of burner, it is difficult to make the burner compact because it is necessary to arrange a large-capacity vaporization pot in front of the liquid fuel injection nozzle, and this vaporization pot increases the output of the burner. There is also the problem that a compact and high-power burner cannot be obtained because of the enormous size. Also, for other types of vaporized combustion burners,
JP-B-57-32289 and JP-B-61-52
A type such as a combustion gas recirculation type vaporization combustion burner as disclosed in Japanese Patent No. 364 is well known, but it takes time until the particles of the liquid fuel are vaporized by the heat of the recirculated combustion gas. As a result, soot is liable to occur, and in addition, if the recirculation path of the combustion gas is not appropriate, it may cause incomplete combustion, or the flame holding function may be insufficient, resulting in misfiring. There is.

Moreover, when the conventional vaporization combustion burner as described above is installed in a thermal equipment such as a boiler, unburned components such as soot and sludge adhere to the heat transfer surface, resulting in a decrease in heat transfer efficiency. However, there were many problems such as problems such as poor ignition and misfire.

[0005]

SUMMARY OF THE INVENTION Therefore, the problem to be solved by the present invention is to provide a small size and a large output, for example, an output sufficient for application to a thermal equipment such as a boiler. The purpose is to provide a vaporization combustion burner.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is a vaporization combustion burner for vaporizing and burning liquid fuel, the combustion air supply passage and the combustion air. A liquid fuel spray nozzle disposed in the supply passage, and a first introduction hole for combustion air which is provided on the downstream side of the spray nozzle and which is substantially coaxial with the spray nozzle and communicates with the combustion air supply passage. And a first base member having
A fuel evaporation cylinder provided on the base member so as to surround the first introduction hole and to be substantially coaxial with the spray nozzle on the downstream side of the introduction hole, and is arranged on the same side as the fuel evaporation cylinder of the base member. , An outer cylinder and an inner cylinder that are substantially coaxial with the outside of the fuel evaporating cylinder, and inflow of combustion air communicating with the combustion air supply passage to a position surrounded by the outer cylinder and the inner cylinder of the base member. A hole is provided and a second introduction hole is formed in the inner cylinder at a position corresponding to the tip of the fuel vaporization cylinder, so that the space between the inner and outer cylinders of the air introduction cylinder serves as a secondary air introduction channel. And a burner casing arranged on the same side of the base member as the air introducing cylinder at a predetermined distance from the outer circumference of the air introducing cylinder. With casing The gap between them serves as the first combustion gas recirculation passage, and the annular gap between the air introduction cylinder and the fuel evaporation cylinder serves as the second combustion gas recirculation passage, and this air is introduced to the base side of the air introduction cylinder. A first combustion gas introducing means configured to penetrate the cylinder in the radial direction and for introducing the exhaust gas in the first combustion gas recirculation path into the inside of the base of the fuel evaporation cylinder; A vaporized combustion burner, which is provided with a second combustion gas introduction means for introducing the exhaust gas in the second combustion gas recirculation passage into the inside of the base of the fuel evaporation tube. Further, a second feature is that the primary air introduction hole is composed of a main introduction hole in the center and a plurality of auxiliary introduction holes provided around the main introduction hole and inclined toward the main introduction hole. A third feature of the vaporization combustion burner is that the inner cylinder of the introduction cylinder is provided with an annular flame holding plate (47) with a predetermined space between the inner cylinder and the outer circumference of the tip of the fuel evaporation cylinder. Is.

[0007]

According to the vaporizing combustion burner according to the present invention, the liquid fuel sprayed from the spray nozzle (11) receives the first introduction hole (21).
Flows into the fuel evaporation tube (30) together with the primary air for combustion from
Vaporization is performed in the fuel evaporation cylinder (30), and further,
The secondary air for combustion is supplied from the second introduction hole (44) at the tip of the fuel evaporating cylinder (30) to perform combustion in a blue flame state. The vaporization of the liquid fuel is carried out directly by the heat of the combustion gas flowing into the fuel evaporation tube (30) through the first combustion gas recirculation passage (60) and the second combustion gas recirculation passage (63). By being heated, the combustion gas also causes the second combustion gas recirculation path (6
It is carried out by being directly heated by the radiant heat from the fuel evaporation tube (30) heated in the process of flowing into the fuel evaporation tube (30) via (3). Further, the supply of the primary air for combustion into the fuel evaporating cylinder (30) is performed by sloping with respect to the main introduction hole (21a) and the main introduction hole (21a) around the main introduction hole (21a). By performing from the sub introduction hole (21b) provided individually,
In the fuel evaporating cylinder (30), stirring and mixing of the primary fuel air and the liquid fuel are promoted. Further, the air introduction tube (4
The inner tube (42) of (0) is provided with an annular flame holding plate (47) with a predetermined space between the inner tube (42) and the outer circumference of the tip of the fuel evaporating tube (30). To improve.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in detail below with reference to the drawings. 1 is an explanatory view schematically showing the cross-sectional structure of one embodiment, FIG. 2 is a front view seen from the combustion flame forming side of the vaporization combustion burner shown in FIG. 1, and FIG. 3 is 2 is a view for explaining the function of the vaporization combustion burner shown in FIG. 1.

The vaporization combustion burner shown in FIGS. 1 and 2 comprises a combustion air supply passage (10), a liquid fuel spray nozzle (11) disposed in the combustion air supply passage (10), and the spray nozzle. (11)
Base member (20) provided on the downstream side of the spray nozzle
(11) a fuel evaporation tube (30) provided on the base member (20) so as to be substantially coaxial with the fuel evaporation tube (30) in the base member (20)
The air introduction cylinder (40) is arranged on the same side as the outer side of the air introduction cylinder (40), and the burner casing (50) is arranged on the outer side thereof.

The combustion air supply passage (10) is supplied with combustion air from an air supply means (not shown) such as a blower. As will be described later, the combustion air is composed of primary air and secondary air. It is divided into air and supplied to the vaporizing combustion burner (B).

The base member (20) is provided with a first introduction hole (21) for combustion air, and the spray nozzle (11) is faced to the first introduction hole (21). , Is substantially coaxial. The air flow from the combustion air supply passage (10) to the first introduction hole (21) is configured to flow in via the flow straightening cylinder (22). That is, the rectifying cylinder (22) has a combustion air supply passage (1
(0) has the function of preventing uneven flow of the air flow,
It has a bottomed cylindrical shape as shown in the drawing, and has a plurality of air introduction holes (23) formed in its side surface. Also, the spray nozzle
(11) is provided so as to penetrate the end wall (24) of the flow straightening cylinder (22). In addition, the spray nozzle (1
A spark rod (25) for ignition is provided close to 1), and this spark rod (25) also penetrates the end wall (24) of the flow straightening cylinder (22) like the spray nozzle (11). It is provided in.

The fuel evaporation tube (30) is provided with the first introduction hole (2
On the downstream side of 1), it is attached to the base member (20) so as to surround the first introduction hole (21) and to be coaxial with the spray nozzle (11).

The air introducing cylinder (40) includes an outer cylinder (41) and an inner cylinder (4).
2) and a double cylinder shape, and the length from the base member (20) is a length protruding from the tip of the fuel evaporation cylinder (30). Of the annular space surrounded by the outer cylinder (41) and the inner cylinder (42), the end portion on the side of the base member (20) has an inlet hole (43) for the combustion air in the base member (20). ) Is formed to communicate with the combustion air supply passage (10), the other end side (tip side) is closed, and the inner side surface of the inner cylinder (42) further has a combustion side. Next air to the fuel evaporation tube (30)
By forming a plurality of second introduction holes (44) for supplying at the tip side of the, the annular space surrounded by the outer cylinder (41) and the inner cylinder (42) is filled with secondary air for combustion. Introductory channel
It is functioning as (45). In this embodiment, the second introduction hole (44) is formed in a taper portion (46) of a divergent shape formed at the tip of the inner cylinder (42), and further, a predetermined number of fan-shaped holes are arranged. It is provided for each group.

The burner casing (50) is arranged outside the air introducing cylinder (40) of the base member (20), and the length from the base member (20) is the same as that of the air introducing pipe (40). The length is such that it projects from the tip of the tube (40). Then, at the tip of the burner casing (50), an annular baffle plate (5) is formed so as to reduce the opening diameter of the burner casing (50).
1) is provided. The inner diameter of the baffle plate (51) is set smaller than the opening diameter of the air introducing cylinder (40).

An annular gap between the air introducing cylinder (40) and the burner casing (50) is defined as a first combustion gas recirculation path (60), and the first combustion gas recirculation path (60) The communication with the fuel evaporating cylinder (30) is configured such that the air introducing cylinder (40) is radially penetrated to the base side of the air introducing cylinder (40).
The combustion gas introduction means (61) is used. That is, in the illustrated embodiment, the first combustion gas introducing means (61) is provided at the base end side of the air introducing cylinder (40), and the inner and outer cylinders (42) (4)
It serves as a first combustion gas introduction pipe (62) penetrating 1). One end of the first combustion gas introduction pipe (62) is open to the outer peripheral surface of the outer cylinder (41), and the other end is open to the inner surface of the fuel evaporation cylinder (30). Further, an annular gap between the air introduction tube (40) and the fuel evaporation tube (30) is provided as a second combustion gas recirculation path (63). Communication with the cylinder (30) is provided by a second combustion gas introducing means formed on the base side of the fuel evaporating cylinder (30) (in this embodiment, it is a hole, and hereinafter referred to as a second combustion gas introducing hole) ( 64).

In the illustrated embodiment, the first combustion gas introduction pipes (62) and the second combustion gas introduction holes (64) are arranged alternately in the circumferential direction in the fuel vaporization tube (30). And the number of each is four. Further, the opening diameters of the first combustion gas introduction pipe (62) and the second combustion gas introduction hole (64) are set larger in the first combustion gas introduction pipe (62).

Further, in this embodiment, the fuel evaporating cylinder (3) is provided on the base end side of the taper portion (46) of the air introducing cylinder (40).
An annular flame holding plate (47) is provided in a state where a predetermined distance is maintained between the outer periphery of the tip of (0) and the outer circumference. This flame holding plate (47)
By forming an enlarged flow path at the tip of the fuel evaporating cylinder (30), a vortex flow is generated on the downstream side of the flame holding plate (47) to improve the flame holding property. Further, the flame holding plate (47) allows the fuel vaporization cylinder (30) and the air introduction cylinder to be
The opening area on the inflow side of the second combustion gas recirculation passage (63) formed between (40) and (40) is set to a predetermined value.

Further, as shown in the figure, the first introduction hole (21) is a main introduction hole (21a) which is substantially coaxial with the spray nozzle (11).
And a plurality of sub-introduction holes (21b) around the main introduction hole (21a) that are inclined toward the main introduction hole (21a) to supply combustion air into the fuel evaporation tube (30) By doing so, it is possible to promote the stirring and mixing of the fuel air and the liquid fuel in the fuel evaporating cylinder (30) and improve the combustion performance. In this embodiment, the main introduction hole (21a),
Primary air is introduced from the combustion air supply passage (10) through the flow straightening cylinder (22), and primary air is introduced directly from the combustion air supply passage (10) into the auxiliary introduction hole (21b). Is configured. Further, in this embodiment, the sub-introduction hole (2
1b) is also provided with an introduction hole (21c) that is parallel to the main introduction hole (21a) and primary air is also introduced from this introduction hole (21c). The stirring and mixing properties and combustion performance of are further improved. In addition to the holes as described above, the first introduction hole (21) may be configured by providing a tubular member through the base member (20).

The combustion action of the vaporized combustion burner having the above-mentioned structure will be described. First, the combustion air in the combustion air supply passage (10) is introduced into the first introduction hole (21) (in this embodiment, the main introduction hole (21a), the sub introduction hole (21b), and the introduction hole ( 21c)) to the fuel evaporating cylinder (30) and to introduce the secondary air for combustion from the inflow hole (43).
It is introduced into (45), liquid fuel is supplied from the spray nozzle (11) into the fuel evaporation tube (30), and the spark rod (25) is energized. By the discharge energy of the spark rod (25),
Part of the fine particles of the sprayed liquid fuel becomes high temperature, and the fine particles mix with the fine particles of other liquid fuel together with the primary air for combustion, and the inside of the fuel evaporation tube (30) is moved to the tip side (Fig.
(To the right of the). In this process, a part of the high-temperature liquid fuel particles reacts with the primary air for combustion, and further, from the second introduction hole (44) at the tip opening of the fuel evaporation tube (30). The next air is supplied.
Here, the air required to completely burn the atomized liquid fuel is supplied, and the fine particles of the high-temperature liquid fuel are first ignited, and this reaction is propagated to the surrounding fuel fine particles, and the fuel evaporation cylinder A flame in a blue flame state is generated on the leading end side of (30), and is held on the downstream side of the flame holding plate (47).

The combustion flame formed through the above process is
It is only for a very short time after the ignition operation, and thereafter, the process proceeds to the stable vaporization combustion in the blue flame state through the following process. That is, since the flow from the opening of the fuel evaporating cylinder (30) is accompanied by the combustion of the fine particles of the liquid fuel, the fuel evaporating cylinder (3
The pressure in the opening of the first combustion gas introduction pipe (62) on the base end side of (0) is lower than the pressure in the gap between the tips of the burner casing (50) and the air introduction cylinder (40). There is. The pressure at the opening of the second combustion gas introduction hole (64) on the base end side of the fuel evaporating cylinder (30) is also the same as the tip of the fuel evaporating cylinder (30) and the burner casing (50). It is lower than the pressure in the gap between them. Therefore, due to this pressure difference, the combustion gas from the fuel vaporization tube (30) flows from the gap between the tips of the burner casing (50) and the air introduction tube (40) to the first combustion gas recirculation path (60). )
After flowing into the inside, it flows from the first combustion gas introducing pipe (62) into the fuel evaporating cylinder (30), and at the same time, a gap portion between the tip of the fuel evaporating cylinder (30) and the burner casing (50). From the second combustion gas recirculation path (63) into the second combustion gas introduction hole (6
It flows into the fuel evaporation tube (30) from 4). At this time, the first
The combustion gas flowing into the fuel vaporization tube (30) through the combustion gas recirculation path (60) and the second combustion gas recirculation path (63) is a liquid from the spray nozzle (11) due to the heat that the combustion gas itself has. Directly heat the fuel. Further, the combustion gas flowing in the second combustion gas recirculation path (63) heats the fuel evaporation tube (30) during the flow process, and the liquid fuel flows from the fuel evaporation tube (30). It is also heated by radiant heat. Therefore, the liquid fuel from the spray nozzle (11) is effectively heated directly and indirectly by the combustion gas, and is vaporized in an extremely short time. For this reason, in the vaporization combustion burner according to the present invention, the combustion shifts to the steady combustion with the blue flame in a very short time. In this steady combustion state, the combustion gas flowing into the fuel evaporation tube (30) through the first combustion gas recirculation passage (60) and the second combustion gas recirculation passage (63) lowers the temperature of the combustion gas. It also has a function to suppress the generation of thermal NO _x .

Further, the vaporizing combustion burner having such a structure has a spray nozzle (1) in a single burner casing (50).
1), the fuel evaporating cylinder (30) and the air introducing cylinder (40) are arranged substantially coaxially to obtain one combustion flame. However, in the present invention, one burner casing (50) is provided. The spray nozzle (11), the fuel evaporating cylinder (30), and the air introducing cylinder (40) are arranged substantially coaxially, but in the vaporization combustion burner according to the present invention, one burner casing (50 ) Inside, spray nozzle (11), fuel evaporation tube (30), air introduction tube (40)
A plurality of structural bodies (hereinafter, referred to as vaporization units) arranged in a substantially coaxial manner are arranged on the base member (20) in a predetermined arrangement, and the plurality of vaporization units are provided outside with a predetermined space therebetween. A burner casing (50) is provided, and the gap between the vaporization units and the gap between the vaporization unit and the burner casing (50) are used as the first combustion gas recirculation passage (60). Good. That is, when using a plurality of vaporization combustion burners, the burner casing (50) of a plurality of vaporization combustion burners can be shared by one by adopting the above-mentioned configuration, and the entire vaporization combustion burner can be downsized. Can be achieved. Moreover, since the interval between the vaporization combustion burners can be narrowed by the above configuration, the vaporization combustion burners can be arranged at a higher density than in the case where each vaporization combustion burner is configured, and vaporization with a small size and a large output is achieved. It becomes possible to provide a combustion burner. Further, since the above vaporization units can individually form combustion flames, by appropriately selecting and igniting each vaporization unit in the burner casing, it is possible to easily adjust the combustion amount and respond to the required heat amount. It is possible to provide a highly practical vaporization combustion burner capable of performing the burned combustion. Furthermore, in this case, since it is possible to obtain a combustion flame having a shape corresponding to the arrangement state of the vaporization units, it is possible to obtain a combustion flame suitable for the burner application, that is, the thermal equipment such as the boiler, combustion furnace, etc. to be applied. It is possible to obtain a vaporized combustion burner having a very wide range of application. That is,
When this vaporization combustion burner is applied to a heating device such as a boiler, the vaporization unit is arranged in the burner casing so that the vaporization unit is arranged along the axial direction of the heat transfer tube of the heating device to be vaporized. The flame from the combustion burner heats the heat transfer tube in a wide range in the axial direction, so that the heat transfer tube can be uniformly heated, which contributes to improvement of thermal efficiency and prevention of overheating of the heat transfer tube. In particular, when the heat equipment to be applied is one having a heat transfer tube group consisting of a large number of heat transfer tubes which are provided substantially parallel to each other at predetermined intervals and which intersect with the combustion flame from the burner, In addition to the above-mentioned effects, since the combustion flame is in wide contact with the heat transfer tube, the combustion flame can be effectively cooled, and NO _x can be effectively reduced by cooling the combustion flame. . Moreover, by disposing the vaporization unit in the axial direction of the heat transfer tube, it is possible to form a flat combustion flame that spreads in the axial direction of the heat transfer tube. The heat can be satisfactorily circulated to the heat transfer tube, and the combustion can be stabilized in relation to the heat equipment, and the cooling effect can be effectively exhibited also in the heat transfer tube on the downstream side.

[0022]

As described above, according to the vaporization combustion burner according to the present invention, the liquid fuel sprayed from the spray nozzle into the fuel evaporating cylinder is formed between the burner casing and the fuel evaporating cylinder. The second combustion gas is heated directly by the combustion gas flowing into the fuel evaporation tube from the first combustion gas recirculation path and the second combustion gas recirculation path formed between the fuel evaporation tube and the air introduction tube. Since it is indirectly heated by the combustion gas flowing in the recirculation passage through the fuel evaporation tube, it effectively vaporizes in a very short time and immediately shifts to steady combustion by a blue flame. It is possible to prevent the generation of soot and the deterioration of combustibility due to the adhesion of soot, and it is possible to maintain stable performance for a long period of time. Moreover, since the liquid fuel can be effectively vaporized in a very short time by direct and indirect heating by the combustion gas, it is easy to increase the supply amount of the liquid fuel, and a vaporizing combustion burner with a large output can be provided. Obtainable. Therefore, according to the present invention, it is possible to provide a small vaporization combustion burner having an output sufficient to be applied to a thermal device such as a boiler,
When applied to such a thermal device, since there is no soot generation as described above, it is possible to effectively solve problems such as a reduction in heat transfer efficiency due to the attachment of soot to the heat transfer surface. .

[Brief description of drawings]

1 is a drawing for explaining the configuration of an embodiment of a vaporization combustion burner according to the present invention, and is a sectional view taken along the line I-I of FIG.

FIG. 2 is a front view of the vaporization combustion burner shown in FIG. 1 as seen from a combustion flame forming side.

FIG. 3 is a view for explaining the function of the vaporization combustion burner shown in FIG.

[Explanation of symbols]

 (10) Combustion air supply path (11) Spray nozzle (20) Base member (21) First introduction hole (21a) Main introduction hole (21b) Sub introduction hole (30) Fuel evaporation tube (40) Air introduction tube ( 41) Outer cylinder (42) Inner cylinder (43) Inlet hole (44) Second introduction hole (45) Introduction passage (47) Flame holding plate (50) Burner casing (60) First combustion gas recirculation passage (61) First combustion gas introduction means (63) Second combustion gas recirculation path (64) Second combustion gas introduction means (second combustion gas introduction hole) (B) Evaporative combustion burner

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kanta Kondo 7 Horie-cho, Matsuyama-shi, Ehime Prefecture Miura Research Institute Co., Ltd.

Claims (3)

[Claims] 1. A vaporization combustion burner for vaporizing and burning liquid fuel, comprising a combustion air supply passage (10) and a liquid fuel spray nozzle (1) disposed in the combustion air supply passage (10).
1) and the downstream side of the spray nozzle (11), which is substantially coaxial with the spray nozzle (11) and the combustion air supply path
A base member (20) having a first introduction hole (21) for combustion air communicating with (10) and surrounding the first introduction hole (21) on the downstream side of the first introduction hole (21). As And And Spraying Nozzle (11)
Fuel evaporation cylinder provided on the base member (20) so as to be substantially coaxial with
(30), the outer cylinder (41) and the inner cylinder (arranged on the same side of the base member (20) as the fuel evaporating cylinder (30) and substantially coaxial with the outside of the fuel evaporating cylinder (30). 42), the inflow hole (43) of the combustion air communicating with the combustion air supply path (10) at a position surrounded by the outer cylinder (41) and the inner cylinder (42) of the base member (20). The inner and outer cylinders (42) of the air introducing cylinder (40) are provided by forming the second introducing hole (44) in the inner cylinder (42) at a position corresponding to the tip of the fuel evaporating cylinder (30). (41) an air introduction tube (40) having a space between secondary air introduction channels (45) and the air introduction tube (40) in the base member (20) on the same side as the air introduction tube A burner casing (5
0) and the air introduction tube (40) and the burner casing (5
0) as the first combustion gas recirculation path (60), and the annular gap between the air introduction tube (40) and the fuel evaporation tube (30) as the second combustion gas recirculation path. (63), which is configured so as to radially penetrate the air introduction tube (40) at the base side of the air introduction tube (40), and the exhaust gas in the first combustion gas recirculation path (60) is a fuel evaporation tube. A first combustion gas introducing means (61) for introducing the inside of the base of (30), and the exhaust gas in the second combustion gas recirculation passage (63) formed on the base side of the fuel evaporation tube (30). A vaporization combustion burner, characterized in that a second combustion gas introduction means (64) for introducing the fuel vaporization cylinder (30) inside the base is provided. 2. A main introduction hole (21a) in the center and a plurality of first introduction holes (21) for the combustion air are provided around the main introduction hole (21a), and a sub-introduction inclined toward the main introduction hole (21a). A vaporization combustion burner according to claim 1, characterized in that it comprises a hole (21b). 3. An inner flame (42) of the air introducing cylinder (40), which has an annular flame retaining plate (42) with a predetermined space between the inner cylinder (42) and the outer circumference of the tip of the fuel evaporating cylinder (30). 47) The vaporized combustion burner according to claim 1 or 2, characterized in that the burner combustion burner is provided.