CN211668032U - Heat exchanger and condensing boiler - Google Patents

Abstract

The utility model provides a heat exchanger and condensing boiler, the heat exchanger includes interior heat exchange tube and is located the outer heat exchange tube of interior heat exchange tube outer lane, interior heat exchange tube is formed with and holds the chamber, the central axis direction that holds the chamber respectively with the central axis direction of interior heat exchange tube and outer heat exchange tube is unanimous, interior heat exchange tube is the fluorescent tube with outer heat exchange tube. The utility model discloses heat exchange efficiency is high, is favorable to realizing high-power boiler.

Description

Heat exchanger and condensing boiler

Technical Field

The utility model relates to a boiler technical field, concretely relates to heat exchanger and condensing 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 prior small condensing boiler or gas condensing water heater is gradually mature, but the condensing technology is slowly developed to the conversion process of a large-scale commercial boiler due to the difficulties in design, processing and batch production of the heat exchanger.

The existing condensing boiler can be generally divided into a stainless steel boiler and a cast aluminum boiler according to materials, because the condensing boiler needs a large heat exchange area, the stainless steel condensing boiler generally adopts finned tubes as heat exchange elements as much as possible, and simultaneously can also bend the finned tubes to strengthen heat exchange in order to improve the heat exchange effect, so that the material use cost and the processing cost are increased by the two schemes, and the production efficiency is influenced simultaneously. Furthermore, when a finned tube is damaged and needs to be replaced, material costs and tooling costs are increased.

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 heat exchanger and condensing boiler, concrete technical scheme is as follows:

on the one hand, the utility model provides a heat exchanger, include interior heat exchange tube and be located the outer heat exchange tube of interior heat exchange tube outer lane, interior heat exchange tube is formed with and holds the chamber, the central axis direction that holds the chamber respectively with the central axis direction of interior heat exchange tube and outer heat exchange tube is unanimous, interior heat exchange tube and outer heat exchange tube are the fluorescent lamp.

Furthermore, the number of the inner heat exchange tubes is multiple, the inner heat exchange tubes are arranged in a radial direction in an adjacent mode, the inner heat exchange tubes arranged in the adjacent mode form an accommodating cavity, and the extending direction of the central axis of the accommodating cavity is consistent with the direction of the central axis of the inner heat exchange tubes;

the outer heat exchange tubes are arranged in parallel and wound on the outer sides of the inner heat exchange tubes, and the length directions of the outer heat exchange tubes are consistent with the central axis direction of the inner heat exchange tubes.

Further, the inner heat exchange tube and the outer heat exchange tube are both carbon steel light tubes;

further, a space is arranged between the inner heat exchange tube and the outer heat exchange tube.

Further, the inner heat exchange tube is one or a combination of a flat tube, a round tube and an oval tube; the outer heat exchange tube is one group or a combination of a plurality of groups of flat tubes, round tubes and oval tubes.

Further, the inner heat exchange tube is a flat tube, and the outer heat exchange tube is a flat tube.

Further, the heat exchanger still includes inferior heat exchange tube, inferior heat exchange tube is multirow, and every row of inferior heat exchange tube includes a plurality of parallel arrangement inferior heat exchange tubes, and a plurality of inferior heat exchange tubes are adjacent in footpath and are arranged.

Further, the secondary heat exchange tube is a stainless steel tube.

The heat exchange tube further comprises a first guide plate and a second guide plate, wherein the first guide plate is positioned on the outer side of the outer heat exchange tube, and a plurality of openings are formed in the first guide plate;

the second guide plates are coated on the upper side and the lower side of each row of secondary heat exchange tubes and are attached to the outer surfaces of the secondary heat exchange tubes.

On the other hand, the utility model provides a condensing boiler, including shell, combustor and foretell heat exchanger, the shell is formed with the furnace chamber, the furnace chamber includes first furnace chamber and is located the second furnace chamber of first furnace chamber below, first furnace chamber with the second furnace chamber is linked together, outer heat exchange tube and interior heat exchange tube all are located in the first furnace chamber, the combustor stretches into hold the intracavity, be equipped with time heat exchange tube in the second furnace chamber.

The utility model discloses following beneficial effect has:

1. the utility model provides a heat exchanger and condensation boiler, it increases the heat transfer area of heat exchanger through two rings of fluorescent tubes, improves the heat transfer effect, is not increasing greatly and congeals under the prerequisite of boiler module appearance, is favorable to realizing high-power boiler like 1000kw boiler.

2. The utility model provides a heat exchanger and condensation boiler for the flue gas that the combustor came out walks along the circumferencial direction of fluorescent lamp, makes the flue gas fully erode the water pipe, changes the flue gas and directly moves the mode in the fin tube clearance, thereby strengthens the vortex effect of flue gas.

3. The utility model provides a heat exchanger and condensing boiler, it is through increasing two rings of fluorescent tubes, and effectual control furnace volume reduces the flue gas temperature, reduces the probability of nitrogen oxide production.

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 condensing boiler provided by an embodiment of the present invention;

FIG. 2 is a schematic view of the separation of the upper and lower structures of FIG. 1;

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

FIG. 4 is a schematic view from the right of FIG. 3;

FIG. 5 is a schematic left side view of FIG. 3;

FIG. 6 is a schematic sectional view taken along line A of FIG. 5;

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

FIG. 8(a) is an enlarged view of the portion D in FIG. 7;

fig. 8(b) is a schematic cross-sectional structure diagram of the outer heat exchange tube of the present invention in one embodiment;

fig. 8(c) is a schematic cross-sectional structure diagram of an inner heat exchange tube of the present invention in one embodiment;

fig. 9 is an enlarged schematic view of a portion of the second baffle C of fig. 2.

Fig. 10 is a schematic structural diagram of a water-cooled burner provided by an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a water-cooled burner provided by an embodiment of the present invention;

FIG. 12 is a schematic front view of FIG. 10;

FIG. 13 is a schematic sectional view taken along line A of FIG. 12;

FIG. 14 is a schematic cross-sectional view taken along line B of FIG. 12;

FIG. 15 is a schematic cross-sectional view taken along line D of FIG. 12;

FIG. 16 is a schematic cross-sectional view taken along line E of FIG. 12;

FIG. 17 is an enlarged schematic view of section F of FIG. 16;

FIG. 18 is an enlarged schematic view of section C of FIG. 10;

fig. 19 is an enlarged schematic view of the portion G of fig. 15.

Wherein, 10-outer shell, 101-upper shell, 102-lower shell, 20-heat exchanger, 201-outer heat exchange pipe, 202-inner heat exchange pipe, 203-secondary heat exchange pipe, 204 first guide plate, 2041-two wings of first guide plate, 2042-support, 2043-plane structure of first guide plate, 205-second guide plate, 2051-long hole, 2052-round hole, 206-containing cavity, 301-first furnace chamber, 302-second furnace chamber, 100-burner, 1-tubular body, 11-inner pipe, 111-open hole, 112-mixing cavity, 12-outer pipe, 13-ribbed plate, 131-containing groove, 2-fluid box, 20 a-front water box, 20 b-rear water box, 21-fire observation hole, 22-fluid inlet, 23-fluid outlet, 24-baffle, 25-gas inlet.

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

Referring to fig. 1 to 9, fig. 1 is a schematic structural diagram of a condensing boiler according to an embodiment of the present invention; FIG. 2 is a schematic view of the separation of the upper and lower structures of FIG. 1; FIG. 3 is a schematic front view of FIG. 1; FIG. 4 is a schematic view from the right of FIG. 3; FIG. 5 is a schematic left side view of FIG. 3; FIG. 6 is a schematic sectional view taken along line A of FIG. 5; FIG. 7 is a schematic cross-sectional view taken along line B of FIG. 3; FIG. 8(a) is an enlarged view of a portion of the second baffle of FIG. 2; fig. 8(b) is a schematic cross-sectional structure diagram of the outer heat exchange tube of the present invention in one embodiment; fig. 8(c) is a schematic cross-sectional structure diagram of an inner heat exchange tube of the present invention in one embodiment; fig. 9 is an enlarged schematic view of a portion of the second baffle of fig. 2.

As shown in fig. 1 to 9, the heat exchanger 20 of the present invention includes an inner heat exchange tube and an outer heat exchange tube located at the outer ring of the inner heat exchange tube, the inner heat exchange tube is formed with a containing cavity 206, the central axis direction of the containing cavity is consistent with the central axis direction of the inner heat exchange tube and the central axis direction of the outer heat exchange tube.

The inner heat exchange tubes are multiple, the inner heat exchange tubes 202 are arranged in an adjacent mode in the radial direction, the adjacent inner heat exchange tubes form accommodating cavities, and the extending direction of the central axis of each accommodating cavity 206 is consistent with the direction of the central axis of each inner heat exchange tube 202.

The outer heat exchange tubes are arranged in parallel and wound on the outer sides of the inner heat exchange tubes, and the length directions of the outer heat exchange tubes are consistent with the central axis direction of the inner heat exchange tubes.

Further, each outer heat exchange pipe 201 and each inner heat exchange pipe 202, etc. are arranged at intervals.

Further, the length of the inner heat exchange pipe (202) is identical to that of the outer heat exchange pipe.

In the using process of the condensing furnace, high-temperature flue gas generated by combustion of the combustor in the furnace cavity diffuses towards the inner heat exchange tube and the outer heat exchange tube, so that the high-temperature flue gas exchanges heat with liquid such as water in the inner heat exchange tube 202 and the outer heat exchange tube 201, and the liquid in the inner heat exchange tube and the liquid in the outer heat exchange tube are heated.

In this embodiment, the inner heat exchange tube and the outer heat exchange tube are both light tubes, and preferably, the inner heat exchange tube and the outer heat exchange tube are both carbon steel light tubes. On one hand, the two circles of light pipes enable smoke coming out of the combustor to move along the circumferential direction of the light pipes, so that the smoke fully washes the water pipes (light pipes), and the turbulence effect of the smoke is changed; on the other hand, the heat exchange area of the heat exchanger is increased by adding two circles of light pipes, the heat exchange effect is improved, and the high-power boiler such as a 1000kw boiler can be realized on the premise of not greatly increasing the appearance of the condensing boiler module.

The utility model discloses an increase two rings of fluorescent tubes, effectual control furnace volume reduces the flue gas temperature, reduces the probability of nitrogen oxide production. And the inner heat exchange tube and the outer heat exchange tube are made of carbon steel, so that the material cost can be reduced, and the water flow flowing through the inner heat exchange tube and the outer heat exchange tube is preheated by the secondary heat exchange tube, so that the temperature of the water flow entering the outer heat exchange tube and the inner heat exchange tube is increased, the condensation phenomenon on the outer surfaces of the outer heat exchange tube and the inner heat exchange tube is prevented, and the outer heat exchange tube and the inner heat exchange tube are prevented from being corroded. Meanwhile, the capacity of the boiler can be increased by increasing the wall thickness and the length of the heat exchange tube, and the large-capacity boiler is favorably developed. Preferably, for the inner heat exchange tube and the outer heat exchange tube, water flow can preferentially pass through the inner heat exchange tube and then pass through the outer heat exchange tube, and the possibility of condensation is further reduced.

Further, the cross section of the outer ring formed by the plurality of outer heat exchange tubes 201 arranged adjacently is circular, and the cross section of the outer ring formed by the plurality of inner heat exchange tubes 202 arranged adjacently is circular. In other embodiments, the cross section of the plurality of outer heat exchange tubes arranged adjacently is not limited to a circular ring shape, but may have other shapes. The cross section of the plurality of inner heat exchange tubes arranged adjacently is not limited to a circular ring shape, and can be in other shapes.

The inner heat exchange tube is one or a combination of a flat tube, a circular tube and an elliptical tube; the outer heat exchange tube is one group or a combination of a plurality of groups of flat tubes, round tubes and oval tubes.

Preferably, the inner heat exchange tube 202 is a flat tube (as shown in fig. 8 (a)), and the outer heat exchange tube 201 is a flat tube (as shown in fig. 8 (c)), so that the heat exchange efficiency of the outer heat exchange tube can be greatly improved.

It should be noted that the shape of each outer heat exchange tube includes, but is not limited to, a flat tube, a circular tube, and an elliptical tube. The cross-sectional shape of each inner heat exchange tube includes, but is not limited to, a flat tube, a circular tube, and an elliptical tube.

In order to enable the flue gas to fully exchange heat with the outer heat exchange pipe 201 and the inner heat exchange pipe 202, a space is arranged between the inner heat exchange pipe 202 and the outer heat exchange pipe 201.

Further, the length of the inner heat exchange pipe 202 corresponds to the length of the outer heat exchange pipe 201.

With continued reference to fig. 6 and 7, each inner heat exchange tube 202 is adjacent to the two outer heat exchange tubes 201, i.e., each inner heat exchange tube 202 and each outer heat exchange tube 201 are arranged in a staggered manner, and the two adjacent inner heat exchange tubes 202 are arranged at equal intervals.

The heat exchanger further comprises a plurality of rows of secondary heat exchange tubes 203, each row of secondary heat exchange tubes comprises a plurality of parallel arrangement secondary heat exchange tubes 203, and the plurality of secondary heat exchange tubes 203 are arranged adjacently in the radial direction. The secondary heat exchange tube is a stainless steel tube. In one embodiment, the outer heat exchange tube 201, the inner heat exchange tube 202 and the secondary heat exchange tube 203 are all stainless steel tubes, so that condensation on the outer surfaces of the outer heat exchange tube and the inner heat exchange tube can be prevented, and corrosion of the outer heat exchange tube and the inner heat exchange tube can be avoided.

With continuing reference to fig. 7 to 9, the heat exchanger of the present invention further includes a flow guide plate, the flow guide plate includes a first flow guide plate 204 and a second flow guide plate 205, and the first flow guide plate 204 is located outside the plurality of outer heat exchange tubes 201.

The first guide plate 204 is V-shaped, two wings 2041 of the V-shaped are connected with a support 2042, the support 2042 is supported on two adjacent outer heat exchange tubes, the two wings of the V-shaped extend outwards to form a planar structure 2043, and the planar structures 2043 of the two wings of the V-shaped are arranged adjacently at equal intervals.

The second guide plate 205 is a tile-shaped structure, an opening is further formed in the second guide plate 205, the opening includes a plurality of strip holes 2051 and a plurality of round holes 2052, and the round holes 2052 are located on two sides of the strip holes 2051.

The utility model discloses following beneficial effect has:

1. the utility model provides a condensing boiler, it increases the heat transfer area of heat exchanger through two rings of fluorescent tubes, improves the heat transfer effect, is not increasing greatly and congeals under the prerequisite of boiler module appearance, is favorable to realizing high-power boiler like 1000kw boiler.

2. The utility model provides a condensing boiler for the flue gas that the combustor came out walks along the circumferencial direction of fluorescent lamp, makes the flue gas fully erode the water pipe, thereby strengthens the vortex effect of flue gas.

3. The utility model provides a condensing boiler, it is through increasing two rings of fluorescent tubes, and effectual control furnace volume reduces the flue gas temperature, reduces the probability of nitrogen oxide production.

Examples

With continued reference to fig. 1 to 9, the present invention further provides a condensing boiler comprising a housing 10, a burner (fig. 10) and a heat exchanger 20 according to the above embodiment.

The outer case 10 is formed with a cavity. The furnace chamber includes first furnace chamber 301 and is located second furnace chamber 302 of first furnace chamber 301 below, first furnace chamber 301 with second furnace chamber 302 is linked together, outer heat exchange pipe 201 and interior heat exchange pipe 202 all are located in first furnace chamber 21, the combustor stretches into hold the intracavity, time heat exchange pipe 203 is located in the second furnace chamber 302.

The outer case 10 includes an upper outer case 101 formed with a first cavity 301 and a lower outer case 102 formed with a second cavity 302.

The utility model discloses following beneficial effect has:

1. the utility model provides a heat exchanger and condensation boiler, it increases the heat transfer area of heat exchanger through two rings of fluorescent tubes to arrange in a reasonable way, improve the heat transfer effect, under the prerequisite of boiler module appearance is congealed in not big range increase, be favorable to realizing high-power boiler like 1000kw boiler.

2. The utility model provides a heat exchanger and condensing boiler for the flue gas that the combustor came out walks along the circumferencial direction of fluorescent lamp, makes the flue gas fully erode the water pipe, thereby strengthens the vortex effect of flue gas.

3. The utility model provides a heat exchanger and condensing boiler, it is through increasing two rings of fluorescent tubes, and effectual control furnace volume reduces the flue gas temperature, reduces the probability of nitrogen oxide production.

It should be noted that the burner of the present invention can be used in a water-cooled burner, wherein the structure of the water-cooled burner will be described in the following embodiments.

Examples

Please refer to fig. 10 to 19. Fig. 10 is a schematic structural diagram of a water-cooled burner provided by an embodiment of the present invention; fig. 11 is a schematic structural diagram of a water-cooled burner provided by an embodiment of the present invention; FIG. 12 is a schematic front view of FIG. 10; FIG. 13 is a schematic sectional view taken along line A of FIG. 12; FIG. 14 is a schematic cross-sectional view taken along line B of FIG. 12; FIG. 15 is a schematic cross-sectional view taken along line D of FIG. 12; FIG. 16 is a schematic cross-sectional view taken along line E of FIG. 12; FIG. 17 is an enlarged schematic view of section F of FIG. 16; FIG. 18 is an enlarged schematic view of section C of FIG. 10; fig. 19 is an enlarged schematic view of the portion G of fig. 15. As shown in fig. 10 to 19, the burner of the present invention is a water-cooled burner, the burner 100 includes a tubular body 1 and a fluid tank 2 connected to two ends of the tubular body 1, and the tubular body 1 includes an inner tube 11 and a plurality of outer tubes 12 located outside the inner tube.

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 axial direction of the multiple rows of the openings 111 is consistent with the axial direction of the inner cylinder 11, two adjacent rows of the openings 111 are arranged at equal intervals, and each row of the openings 111 comprises a plurality of openings 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, 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 according to the size of the heat exchanger 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 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.

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

The light pipe is exemplified to have a length of 950mm and an outer diameter of 20 mm. The inner diameter of the annular structure formed by the plurality of light tubes is 210 mm.

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

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:

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 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.

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.

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 (10)

1. The utility model provides a heat exchanger, its characterized in that includes interior heat exchange tube and is located the outer heat exchange tube of interior heat exchange tube outer lane, interior heat exchange tube is formed with and holds chamber (206), the central axis direction that holds chamber (206) respectively with the central axis direction unanimity of interior heat exchange tube and outer heat exchange tube, interior heat exchange tube and outer heat exchange tube are the fluorescent tube.

2. The heat exchanger according to claim 1, wherein the inner heat exchange tube is a plurality of inner heat exchange tubes, the inner heat exchange tubes (202) are arranged adjacently in the radial direction, the inner heat exchange tubes arranged adjacently form accommodating cavities, and the extension direction of the central axis of each accommodating cavity (206) is consistent with the direction of the central axis of each inner heat exchange tube (202);

the outer heat exchange tubes are arranged in parallel and wound on the outer sides of the inner heat exchange tubes, and the length directions of the outer heat exchange tubes are consistent with the central axis direction of the inner heat exchange tubes.

3. The heat exchanger of claim 1, wherein the inner and outer heat exchange tubes are both carbon steel light tubes.

4. A heat exchanger according to claim 1, wherein the inner heat exchange tube (202) and the outer heat exchange tube (201) have a space therebetween.

5. The heat exchanger according to claim 1, wherein the inner heat exchange tubes (202) are one or more combinations of flat tubes, round tubes and oval tubes; the outer heat exchange tube (201) is one or a combination of a flat tube, a circular tube and an elliptical tube.

6. A heat exchanger according to claim 5, wherein the inner heat exchange tubes (202) are flat tubes and the outer heat exchange tubes (201) are flat tubes.

7. A heat exchanger according to claim 1, further comprising a plurality of rows of secondary heat exchange tubes (203), each row comprising a plurality of parallel arranged secondary heat exchange tubes (203), and a plurality of secondary heat exchange tubes (203) arranged radially adjacent to each other.

8. The heat exchanger of claim 7, wherein the secondary heat exchange tubes are stainless steel tubes.

9. The heat exchanger according to claim 7, characterized by further comprising a first guide plate (204) and a second guide plate (205), wherein the first guide plate (204) is located outside the outer heat exchange pipe (201), and the first guide plate (204) is provided with a plurality of openings;

the second guide plates (205) are wrapped on the upper side and the lower side of each row of secondary heat exchange tubes (203) and attached to the outer surfaces of the secondary heat exchange tubes (203).

10. A condensing boiler, comprising a housing (10), a burner and a heat exchanger (20) according to any one of claims 1 to 9, wherein the housing (10) is formed with a furnace chamber, the furnace chamber comprises a first furnace chamber (301) and a second furnace chamber (302) located below the first furnace chamber (301), the first furnace chamber (301) is communicated with the second furnace chamber (302), the outer heat exchange tube (201) and the inner heat exchange tube (202) are both located in the first furnace chamber (301), the burner extends into the accommodating chamber (206), and the second heat exchange tube (203) is arranged in the second furnace chamber (302).

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