CN212537820U

CN212537820U - A water-cooled burner and condensing boiler

Info

Publication number: CN212537820U
Application number: CN202020176770.2U
Authority: CN
Inventors: 崔树庆; 殷海鹏; 叶昕; 刘靖旻; 徐斌
Original assignee: Suzhou C&q Energy Tech Co ltd; Valpo Energy & Environment Tech Co ltd
Current assignee: Suzhou C&q Energy Tech Co ltd; Valpo Energy & Environment Tech Co ltd
Priority date: 2019-09-23
Filing date: 2020-02-17
Publication date: 2021-02-12
Anticipated expiration: 2030-02-17
Also published as: CN112539410B; CN112539410A

Abstract

The utility model provides a water-cooled burner and a condensing boiler. The water-cooled burner includes a tubular body and a fluid box connected to both ends of the tubular body. The tubular body includes an inner tube and a plurality of outer tubes. Extending along the central axis, it has a mixing cavity, the inner cylinder is provided with multiple rows of openings, the multiple outer tubes are arranged in parallel and wound around the outside of the inner cylinder, and the length direction of the multiple outer tubes is the same as the length of the inner cylinder. The central axis of the inner cylinder is in the same direction, the fluid box has a fluid inlet and a fluid outlet, and the fluid inlet and the fluid outlet are respectively communicated with a plurality of outer pipes. The burner of the utility model is not easy to cause blockage, has good heat exchange effect, and can reduce the content of nitrogen oxides in the flue gas.

Description

Water-cooled combustor and condensation boiler

Technical Field

The utility model relates to a boiler technical field, concretely relates to water-cooled combustor and condensation boiler.

Background

The condensing boiler has the characteristics of high efficiency, energy conservation and environmental protection, is the development direction of the boiler industry, and the technology of the existing small condensing boiler or gas condensing water heater is gradually mature.

Need a large amount of air during the combustor burning, contain a large amount of impurity in the air, current condensation boiler adopts surperficial formula metal fiber mesh structure combustor more, its surface is netted, current surface formula combustor passes through surface winding's metal mesh, can filter the air that gets into the combustor, can make the mist distribute evenly, there is certain tempering prevention function simultaneously, but current combustor easily causes combustor blocking surface, need often to change, wash, waste time and energy, and in case can greatly reduced boiler output after blockking up, and easily cause the combustor to damage, can lead to potential safety hazards such as deflagration even under the adverse circumstances.

Therefore, there is a need to provide a new solution.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem that exists among the prior art, the utility model discloses a water-cooled combustor and condensing boiler, concrete technical scheme is as follows:

on one hand, the utility model provides a water-cooled burner, which comprises a tubular body and fluid tanks connected with two ends of the tubular body, wherein the tubular body comprises an inner cylinder and a plurality of outer tubes,

the inner cylinder extends along the central axis and is provided with a mixing cavity, the inner cylinder is provided with a plurality of rows of openings,

the outer pipes are arranged in parallel and wound on the outer side of the inner cylinder, the length direction of the outer pipes is consistent with the direction of the central axis of the inner cylinder,

the fluid tank is provided with a fluid inlet, a fluid outlet and an air inlet, the fluid inlet and the fluid outlet are respectively communicated with the outer pipes, and the air inlet is communicated with the mixing cavity.

Furthermore, the axial direction of the multiple rows of open pores is consistent with the central axial direction of the inner cylinder, two adjacent rows of open pores are staggered at equal intervals, each row of open pores comprises a plurality of open pores,

two adjacent outer pipes are arranged at equal intervals,

the outer pipes correspond to the multiple rows of the holes one by one, the vertical center line of each row of the holes is overlapped with the radial direction of each corresponding outer pipe, and intervals are arranged between each row of the holes and each corresponding outer pipe.

Further, a space is reserved between every two adjacent outer pipes;

each row of holes has a space with each corresponding outer tube.

Further, the fluid tank at one end of the tubular body is provided with a fluid inlet, a fluid outlet and a partition plate for separating the fluid inlet and the fluid outlet, the fluid inlet and the fluid outlet are respectively communicated with the plurality of outer pipes, and the fluid tank at the other end of the tubular body is provided with an air inlet which is communicated with the mixing cavity.

Further, the outer pipe is a stainless steel light pipe, the outer diameter of the light pipe is 15-40mm, the wall thickness of the light pipe is 1.0-3.0mm, and the plurality of light pipes form a ring-shaped structure along the section direction of the tubular body.

Further, the outer tube is a stainless steel finned tube, the finned tube comprises an inner tube and a plurality of fins arranged on the outer side of the inner tube,

two adjacent finned tubes are arranged at equal intervals, a spacing plate is arranged between the two adjacent finned tubes, the length of the spacing plate is consistent with that of the finned tube fins, a gap is arranged between the two adjacent spacing plates, and each gap corresponds to each row of holes in the inner cylinder one by one.

Further, the space bar includes U type cell body, the length of U type cell body with the length of space bar is unanimous, follows the length direction of U type cell body, certainly U type cell body opening part outwards extends there is the connecting plate, U type cell body inserts between two adjacent finned tubes, and the notch orientation of U type cell body the inner tube, the connecting plate is close to the inner tube.

Further, the outer diameter of the finned tube is 15-40mm, the wall thickness of the finned tube is 1.0-3.0mm, and a plurality of finned tubes form an annular structure along the section direction of the tubular body.

Further, the tubular body further comprises an annular rib plate, the rib plate is sleeved on the outer side of the inner barrel, an accommodating groove is formed in the rib plate, and the outer pipe extends through the accommodating groove along the central axis.

On the other hand, the utility model also provides a condensing boiler, it includes above-mentioned one aspect the water-cooled combustor.

The utility model discloses following beneficial effect has:

1. the utility model provides a water-cooled burner, it is the tubular structure, wherein use the utility model discloses 1050 kw's water-cooled burner is taken as an example, and the mixed intracavity flame area of this combustor can reach 1.035m²The heat exchange area can be effectively radiated, the combustion intensity of unit area is reduced, and the operation condition of the combustor is improved.

2. The utility model provides a water-cooled combustor, its burning is exothermic even, and the flame root has arranged circulating pipe, effectively reduces the flame temperature, reduces nitrogen oxide and generates the probability, and the nitrogen oxide content that the burning produced is low.

3. The utility model provides a water-cooled combustor, it has inner tube and outer tube, and the inner tube has the trompil of a certain quantity as an air current distribution section of thick bamboo, inner tube, and the single trompil diameter of inner tube is 2-4mm, and the trompil area is reasonable, and the rational distribution has airflow distribution in the section of thick bamboo, guarantees that combustor surface flame distributes evenly, has improved combustion efficiency, and the outer tube can reduce the temperature of flame as the water pipe to nitrogen oxide's content in the flue gas has been reduced.

4. The utility model provides a water-cooled combustor, its water pipe internal diameter can reach 15-40mm, and the water pipe is inside to be difficult for blockking up, does not need the periodic replacement to wash, improves the stability of boiler operation, and its water pipe interval is enough big, can not cause to block up and the security performance is high, consequently does not need the periodic replacement combustor, has guaranteed the stability that the boiler was exerted oneself.

5. The utility model provides a water-cooled combustor through sheatheeing the floor in the inner tube outside, not only can fix and strengthen inner tube and outer tube, can control the distance between inner tube and the outer tube moreover.

6. The utility model provides a water-cooled combustor, its water pipe are stainless steel material, can prevent the corruption of acid comdenstion water, and stainless steel material intensity is big, can satisfy abominable operational environment in the furnace.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a water-cooled burner according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a water-cooled burner according to an embodiment of the present invention;

FIG. 3 is a schematic front view of FIG. 1;

FIG. 4 is a schematic sectional view taken along line A of FIG. 3;

FIG. 5 is a schematic cross-sectional view taken along line B of FIG. 3;

FIG. 6 is a schematic cross-sectional view taken along line D of FIG. 3;

FIG. 7 is a schematic cross-sectional view taken along line E of FIG. 3;

FIG. 8 is an enlarged schematic view of section F of FIG. 7;

FIG. 9 is an enlarged schematic view of section C of FIG. 1;

FIG. 10 is an enlarged schematic view of section G of FIG. 6;

fig. 11 is a schematic structural view of a water-cooled burner according to another embodiment of the present invention;

FIG. 12 is a sectional view taken along line H of FIG. 11;

fig. 13 is an enlarged view of a portion ii of fig. 12.

The device comprises a tubular body 1, an inner cylinder 11, an opening 111, a mixing cavity 112, an outer pipe 12, a rib plate 13, a holding tank 131, a fluid tank 2, a front water tank 20a, a rear water tank 20b, a fire observation hole 21, a fluid inlet 22, a fluid outlet 23, a partition plate 24, an air inlet 25, a finned pipe 121, an inner pipe 1211, fins 1212, a partition plate 14, a U-shaped groove body 141 and a connecting plate 142.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or may be connected through the interior of two elements or in interactive relation with one another. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Examples

The utility model provides a water-cooled combustor, including siphonozooid 1 and connect in the fluid box 2 at 1 both ends of siphonozooid, siphonozooid 1 includes inner tube 11 and is located many outer tubes 12 in the inner tube outside.

The inner cylinder 11 extends along the central axis and has an inner surface and an outer surface, the inner surface is formed with a mixing chamber 112, and the inner cylinder is provided with a plurality of rows of openings 111.

The tube wall thickness of the inner tube 11 is 0.2-0.8mm, preferably, the tube wall thickness of the inner tube 11 is 0.8mm, and the inner diameter of the inner tube 11 is reasonably matched and determined according to the size of the hearth. In the example, the inner cylinder 11 has a wall thickness of 0.8mm and the inner cylinder 11 has an inner diameter of 200 mm.

The axial direction of the multiple rows of the open holes 111 is consistent with the axial direction of the inner cylinder 11, two adjacent rows of the open holes 111 are staggered at equal intervals, and each row of the open holes 111 comprises a plurality of open holes 111. The plurality of openings 111 may be arranged at equal intervals.

In a preferred embodiment, the plurality of apertures 111 are shaped to include, but are not limited to, a kidney-round aperture and/or a round aperture. The oval holes and the round holes are alternately arranged at equal intervals, and the opening direction of the oval holes is consistent with the direction of the central axis of the inner barrel 11.

Further, the opening direction of the oval hole coincides with the axial direction of the inner cylinder 11.

The utility model provides a water-cooled combustor, a section of thick bamboo is as the air current distribution section of thick bamboo in it, and the inner tube has the trompil of a certain quantity, and the single trompil diameter of inner tube is 2-4mm, and the trompil area is reasonable, and the air current distribution in the rational distribution section of thick bamboo has guaranteed that combustor surface flame distributes evenly, has improved combustion efficiency.

The outer tubes are arranged in parallel and wound on the outer side of the inner tube 11, and the length direction of the outer tubes 12 is consistent with the direction of the central axis of the inner tube 11.

Further, two adjacent outer tubes 12 are equally spaced, preferably, two adjacent outer tubes 12 have a spacing therebetween, in the example, the spacing between two adjacent outer tubes 12 is 3-5mm, and preferably, the spacing between two adjacent outer tubes 12 is 5 mm.

The outer pipes 12 correspond to the multiple rows of the open holes 111 one to one, the number of rows of the open holes 111 of the inner cylinder 11 is consistent with the number of the outer pipes 12, the vertical center line of each row of the open holes 111 is coincident with the radial direction of each corresponding outer pipe 12, a space is reserved between each row of the open holes 111 and each corresponding outer pipe 12, the space between each row of the open holes 111 and each corresponding outer pipe 12 is 3-5mm, preferably, the space between each row of the open holes 111 and each corresponding outer pipe 12 is 5mm, so that the mixed gas passing through the open holes 111 can be uniformly distributed to the outer side or side edge of each outer pipe 12, and the heat exchange of the outer pipes 12 is more uniform and efficient.

The outer pipe 12 is used as a water pipe, and the water pipe is arranged at the root of the flame, so that the temperature of the flame can be effectively reduced, and the content of nitrogen oxides in the flue gas is reduced.

In this embodiment, the outer tube 12 is a stainless steel light tube, and a plurality of light tubes form an annular structure, and the specific size of the annular structure is determined by matching the size of the boiler furnace. The outer diameter of the light pipe is 15-40mm, and the wall thickness of the light pipe is 1.0-3.0 mm. The length of the light pipe is 800-1500mm, the inner diameter of the annular structure formed by the plurality of light pipes is 150-300mm, the length of the light pipe is 950mm, and the outer diameter of the light pipe is 20 mm. Example multiple light pipes form a ring structure with an inner diameter of 210 mm.

The utility model provides a water-cooled burner, its water pipe internal diameter can reach 15-40mm, the water pipe is difficult for blockking up inside, do not need to change regularly and wash, improve the stability of boiler operation, its water pipe interval is big enough, can not cause the jam and the security performance is high, therefore do not need to change the burner regularly, has guaranteed the stability that the boiler is exerted oneself; and the water pipe is made of stainless steel material, so that the corrosion of the acid condensate water can be prevented, and the stainless steel material has high strength and can meet the severe working environment in the hearth.

In one embodiment, the tubular body 1 further includes an annular rib 13, the rib 13 is sleeved outside the inner tube 11, a receiving groove 131 is formed on the rib 13, and the outer tube 12 extends through the receiving groove 131 along the central axis. The utility model discloses a floor can fix and strengthen inner tube 11 and outer tube 12, and can control the distance between inner tube 11 and the outer tube 12.

In this embodiment the fluid tank at one end of the tubular body 1 has a fluid inlet 22, a fluid outlet 23 and a partition 24, the partition 24 being connected between the fluid inlet 22 and the fluid outlet 23. The fluid tank 2 at the other end of the tubular body 1 has an air inlet 25, said air inlet 25 communicating with the mixing chamber 112.

Specifically, the fluid tank 2 includes a front water tank 20a and a rear water tank 20b, the rear water tank 20b has a fluid inlet 22, a fluid outlet 23, and a partition plate 24, the fluid inlet 22 and the fluid outlet 23 are respectively communicated with the plurality of outer pipes 12, and the outer pipes 12 are divided into two flows of water inlet and water outlet by the partition plate 24. Fluid, such as water, enters the outer tube 12 from the fluid inlet 22 and exits the fluid outlet 23 after at least two passes between the outer tubes.

It should be noted that, by providing the partition plate 24 in the rear water tank 20b, the outer pipe 12 can be divided into a plurality of flow paths, and particularly, the flow path of the water path can be flexibly adjusted according to actual conditions.

The front water tank 20a has an air inlet 25, and the air inlet 25 communicates with the mixing chamber 112. The gas (gas and air) delivered by the external fan or mixer enters the mixing cavity 112 through the air inlet 25, is distributed by the inner barrel 11, and then is combusted at the outer side of the outer tube 12 or at the side edge of the outer tube 12, and at the moment, the combustion flame is cooled by the water flow in the outer tube 12, so that the content of nitrogen oxide generated by combustion can be reduced. In one embodiment, an external fan or mixer is connected to the fluid tank by a screw.

The front water chamber 20a also has a fire observation hole 21 and a fire observation hole 21 for installing an electronic igniter therein, and the combustion condition on the outside of the outer tube 12 or on the side of the outer tube 12 can be observed through the fire observation hole 21.

In another embodiment, the fluid tank 2 at one end of the tubular body 1 has a fluid inlet 22, and the fluid tank 2 at the other end of the tubular body 1 has a fluid outlet 23, and fluid, such as water, enters all the outer tubes 12 from the fluid inlet 22, and after one (single) pass between the outer tubes 12, the water then exits from the fluid outlet 23.

The utility model discloses a fluid tank passes through welded connection with the siphonozooid.

Examples

Referring to fig. 11 to 13, fig. 11 is a schematic structural view of a water-cooled burner according to another embodiment of the present invention; FIG. 12 is a sectional view taken along line H of FIG. 11; fig. 13 is an enlarged view of a portion ii of fig. 12.

In the embodiment, the outer tube 12 is a stainless steel finned tube, the outer diameter of the finned tube is 15-40mm, the wall thickness of the finned tube is 1.0-3.0mm, and the width of the finned tube is 2-10 mm.

Along the cross-sectional direction of the tubular body 1, a plurality of finned tubes form an annular structure, the inner diameter of the annular structure formed by the plurality of finned tubes is determined according to the size of a hearth of the heat exchanger in a matching mode, and in the example, the inner diameter of a tube ring formed by the finned tubes is 300 mm. In the example, the length of the finned tube is 950mm, and the length and the number of the finned tubes and the inner diameter of an annular structure formed by surrounding a plurality of finned tubes are matched and determined according to the size of a hearth of the heat exchanger.

In the example, the outer diameter of the finned tube is 20mm, the wall thickness of the finned tube is 1.2mm, the length of the finned tube is 950mm, and the width of the finned tube is 8.5 mm.

The finned tube 121 includes an inner tube 1211 and a plurality of fins 1212 provided on an outer side of the inner tube, the plurality of fins being arranged adjacent to each other at equal intervals.

Two adjacent finned tubes 121 are arranged at equal intervals, a spacing plate 14 is arranged between the two adjacent finned tubes 121, the length of the spacing plate 14 is consistent with that of fins of the finned tubes 121, gaps are formed between the two adjacent spacing plates 14, and each gap corresponds to each row of the holes 111.

The division board 14 includes U type cell body 141, the length of U type cell body 141 with the length of division board 14 is unanimous, follows U type cell body 141's length direction, certainly U type cell body 141 opening part outwards extends has connecting plate 142, U type cell body 141 inserts between two adjacent finned tubes 121, and U type cell body 141's notch orientation the inner tube 11, connecting plate 142 is close to the inner tube 11.

Preferably, the connecting plate 142 is vertically connected to the U-shaped groove 141.

Referring to fig. 13, the arrow in fig. 13 indicates the direction of the flue gas generated by the burner, specifically, the flue gas generated by the burner is distributed by the airflow through the opening 111 of the inner tube 11, and a part of the flue gas distributed by the inner tube passes through the gap between the two partition plates and enters the gap between the two adjacent fins, so that the water flow in the inner tube of the finned tube is subjected to heat exchange, the temperature of the flue gas is reduced, and the content of nitrogen oxides in the flue gas is reduced.

The thickness of the tube wall of the inner tube 11 is 0.2-0.8mm, and the thickness of the tube wall of the inner tube 11 is 0.8 mm.

Examples

The utility model also provides a condensing boiler, its characterized in that, it includes foretell water-cooled combustor.

The utility model discloses following beneficial effect has:

3. The utility model provides a water-cooled combustor, it has inner tube and outer tube, and the inner tube has the trompil of a certain quantity as an air current distribution section of thick bamboo, inner tube, and the single trompil diameter of inner tube is 2-4mm, and the total area of trompil is reasonable, and rational distribution has the air current distribution in the section of thick bamboo, guarantees that combustor surface flame distributes evenly, has improved combustion efficiency, and the outer tube can reduce the temperature of flame as the water pipe to nitrogen oxide's content in the flue gas has been reduced.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by one skilled in the art.

While embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications and changes may be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A water-cooled burner, characterized in that it comprises a tubular body (1) and a fluid box (2) connected to both ends of the tubular body, the tubular body (1) comprising an inner cylinder (11) and a plurality of outer tube (12),

The inner cylinder (11) extends along the central axis and has a mixing cavity (112), and the inner cylinder (11) is provided with a plurality of rows of openings (111),

The plurality of outer tubes (12) are arranged in parallel around the outer side of the inner cylinder (11), and the length directions of the plurality of outer tubes (12) are consistent with the central axis direction of the inner cylinder (11),

The fluid box (2) has a fluid inlet (22), a fluid outlet (23) and an air inlet (25), and the fluid inlet (22) and the fluid outlet (23) are respectively communicated with a plurality of outer pipes (12) , the air inlet (25) communicates with the mixing chamber (112).

2. The water-cooled burner according to claim 1, wherein the axial direction of the multiple rows of openings (111) is consistent with the central axis direction of the inner cylinder (11), and the two adjacent rows of openings (111) 111) are staggered at equal intervals, and each row of openings (111) includes a plurality of openings (111),

The two adjacent outer pipes (12) are arranged at equal intervals,

The plurality of outer tubes (12) are in one-to-one correspondence with the plurality of rows of openings (111), and the vertical centerline of each row of openings (111) coincides with the radial direction of each corresponding outer tube (12), and There is a space between each row of openings (111) and each corresponding outer tube (12).

3. The water-cooled burner according to claim 2, characterized in that, there is a space between two adjacent outer pipes (12);

There is a space between each row of openings (111) and each corresponding outer tube (12).

4. The water-cooled burner according to claim 3, wherein the fluid box at one end of the tubular body has a fluid inlet (22), a fluid outlet (23) and a fluid inlet (22) for separating the fluid inlet and the partition (24) of the fluid outlet (23), the fluid inlet (22) and the fluid outlet (23) are respectively communicated with a plurality of outer pipes (12), and the fluid tank ( 2) There is an air inlet (25), and the air inlet (25) communicates with the mixing chamber (112).

5. The water-cooled burner according to claim 1, wherein the outer pipe (12) is a stainless steel light pipe, the outer diameter of the light pipe is 15-40mm, and the wall thickness of the light pipe is 1.0-3.0mm, along the cross-sectional direction of the tubular body (1), a plurality of light pipes form an annular structure.

6. The water-cooled burner according to claim 1, wherein the outer tube is a stainless steel finned tube (121), and the finned tube comprises an inner tube (1211) and a plurality of fins (1212),

Two adjacent finned tubes (121) are arranged at equal intervals, and a spacer plate (14) is arranged between the two adjacent finned tubes, the length of the spacer plate being the same as the length of the finned tube fins (1212) The lengths are the same, and there is a gap between two adjacent spacer plates, and each gap corresponds to each row of openings in the inner cylinder (11) one-to-one.

7 . The water-cooled burner according to claim 6 , wherein the partition plate ( 14 ) comprises a U-shaped groove body ( 141 ), and the length of the U-shaped groove body ( 141 ) is the same as that of the partition plate. 8 . The length of the U-shaped groove body is the same, along the length direction of the U-shaped groove body, a connecting plate (142) extends outward from the opening of the U-shaped groove body, and the U-shaped groove body (141) is inserted into two adjacent fins between the sheet tubes, the notch of the U-shaped groove body (141) faces the inner cylinder (11), and the connecting plate (142) is close to the inner cylinder (11).

8 . The water-cooled burner according to claim 6 , wherein the outer diameter of the finned tube is 15-40 mm, the wall thickness of the finned tube is 1.0-3.0 mm, and along the tubular body ( 1), a plurality of finned tubes form an annular structure.

9 . The water-cooled burner according to claim 1 , wherein the tubular body ( 1 ) further comprises an annular rib ( 13 ), and the rib ( 13 ) is sleeved on the inner cylinder ( 9 . 11), an accommodation groove (131) is formed on the rib plate (13), and the outer tube (12) extends through the accommodation groove (131) along the central axis.

10. A condensing boiler, characterized in that it comprises the water-cooled burner according to any one of claims 1-9.