CN211400290U

CN211400290U - Boiler adopting spiral flat tube heat exchanger

Info

Publication number: CN211400290U
Application number: CN201921928321.2U
Authority: CN
Inventors: 杨启鹏; 陈政武
Original assignee: Guangzhou Wetz Thermal Technology Co ltd
Current assignee: Guangzhou Wetz Thermal Technology Co ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2020-09-01
Anticipated expiration: 2029-11-08

Abstract

The utility model provides an adopt spiral flat tube heat exchanger's boiler belongs to boiler technical field, the induction cooker comprises a cooker bod, heat exchanger and combustor, it has combustor installing port and flue gas export to open on the furnace body, heat exchanger fixed mounting is in the furnace body, the combustor is fixed in furnace body one end, the heat exchanger includes casing and heat exchange tube, the transversal platykurtic of personally submitting of heat exchange tube, the heat exchange tube is fixed inside the casing, the inside water diversion box that gathers that is fixed with of casing, it has inlet tube and outlet pipe to gather on the water diversion box, inlet tube and outlet pipe expose outside the casing, the heat exchange tube with gather the water diversion box intercommunication, cold water is gathered the water diversion box by the inlet tube entering, in proper order through gathering the water diversion box. The heat exchanger adopted by the boiler has unique structure, compact structure, high thermal efficiency and good overall economic benefit.

Description

Boiler adopting spiral flat tube heat exchanger

Technical Field

The utility model relates to a boiler technical field, more specifically relates to an adopt flat tub of heat exchanger's of spiral boiler.

Background

The boiler is an energy conversion device, the energy input to the boiler comprises chemical energy and electric energy in fuel, and the boiler outputs steam, high-temperature water or an organic heat carrier with certain heat energy. The hot water or steam generated in the boiler can directly provide heat energy for industrial production and people life, and can also be converted into mechanical energy through a steam power device, or the mechanical energy is converted into electric energy through a generator. The boiler is widely applied, and the shadow can be seen in various places such as textile, printing and dyeing, pharmacy, chemical industry, oil refining, paper making, hotels, industrial and mining places, public institutions and the like. The boiler has a plurality of using occasions, and the heat efficiency of the boiler is paid more and more attention by more and more people at the present that the energy is increasingly in short supply. The heat exchanger is generally adopted in the boiler to realize the energy exchange of different media, and the heat exchanger is used as a core part of the boiler, so that the heat exchange efficiency of the heat exchanger has great influence on the energy utilization rate of the boiler. The boiler heat exchanger applied to the existing market generally has the problems of low heat exchange efficiency, large structure, too large gap between the heat exchange tubes in the heat exchanger and inconvenience for heat exchange among different media.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an adopt spiral flat tube heat exchanger's boiler, the heat exchanger structure that this boiler adopted is unique, compact structure, thermal efficiency is high, and the whole economic benefits of boiler is good.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides an adopt spiral flat tube heat exchanger's boiler, includes furnace body, heat exchanger and combustor, it has combustor installing port and exhanst gas outlet to open on the furnace body, heat exchanger fixed mounting is in the furnace body, the combustor is fixed the combustor installing port, the heat exchanger includes casing and heat exchange tube, the transversal platykurtic of personally submitting of heat exchange tube, the heat exchange tube is fixed inside the casing, the inside water distribution box that gathers that is fixed with of casing, it has inlet tube and outlet pipe to gather on the water distribution box, the inlet tube with the outlet pipe expose in outside the casing, the heat exchange tube with gather the water distribution box intercommunication, cold water by the inlet tube gets into gather the water distribution box, pass through in proper order gather the water distribution box flow back behind the heat exchange tube gather the water distribution box, follow the outlet.

In a preferred technical solution of the present invention, the heat exchange tubes are spirally arranged, the heat exchange tubes are arranged in a plurality of groups along an axial direction, each group of the heat exchange tubes has the same structure and shape and is composed of two different heat pipes, and each group of the two different heat exchange tubes is wound into two layers from inside to outside along a radial direction; the heat exchange tubes are communicated with the water collecting and distributing box, and the heat exchange tubes are fixed at the bottom of the water collecting and distributing box in parallel along the length direction of the water collecting and distributing box.

The utility model discloses in the preferred technical scheme, be fixed with the cross baffle in the water gathering and dividing box, the cross baffle will gather the water dividing box and separate into mutually independent first district, second district, third district, fourth district.

In the preferred technical solution of the present invention, the water inlet pipe is communicated with the first zone, the bottom of the first zone is communicated with the water inlet of the heat exchange pipe, and the bottom of the second zone is communicated with the water outlet of the heat exchange pipe; the second area with the third area be equipped with the opening on the cross baffle, the second area pass through opening on the cross baffle with the third area intercommunication, third area bottom with the water inlet intercommunication of heat exchange tube, fourth area bottom with the delivery port intercommunication of heat exchange tube, the fourth area with the outlet pipe intercommunication.

The utility model discloses in the preferred technical scheme, the combustor includes fan, control box, combustion head and blender, the fan is fixed furnace body one end, the play tuber pipe one end of fan with the combustion head is connected, the control box is fixed on the fan, the blender is installed the air intake department of fan, the combustion head is installed the fan with the handing-over department of furnace body, just the ignition electrode of combustion head is located in the furnace of furnace body, and is close to the combustion head sets up, the ignition electrode of combustor with the control box electric connection.

The utility model discloses among the preferred technical scheme, the design of the transversal platykurtic of personally submitting middle width, the both ends are narrow of heat exchange tube, the width of the widest department of heat exchange tube and the ratio of the width of narrowest department are 5: 1-3: 2; each group of spiral heat exchange tubes is provided with 2-6 circles along the axial direction, and the distance between every two adjacent circles of heat exchange tubes is 0.5-3 mm; the distance between two adjacent groups of heat exchange tubes is 0.5mm-3 mm.

The utility model discloses in the preferred technical scheme, the casing is the tube-shape, gather the length direction of water distribution box with the length direction of casing is unanimous, follows casing length direction's both ends are equipped with combustor installing port and exhanst gas outlet respectively, exhanst gas outlet department is fixed with thermodetector.

In the preferred technical solution of the present invention, a partition board is disposed in the casing, the shape of the partition board is adapted to the shape of the spiral heat exchange tube, the outer diameter of the partition board is greater than or equal to the outer diameter of the outermost layer of the spiral heat exchange tube, and a flue gas cavity for flue gas circulation is disposed between the outer wall of the outermost layer of the spiral heat exchange tube and the inner wall of the casing, the partition board being fixed between the plurality of groups of heat exchange tubes; the height of the cavity in the radial direction is greater than half the diameter of the flue gas outlet.

In the preferred technical solution of the present invention, the air port of the mixer is connected to an air filter, the gas port is connected to an electromagnetic valve, the electromagnetic valve is externally connected to a gas source, the water inlet pipe is provided with a water temperature detection port, the combustion head is provided with a detection electrode, and the detection electrode is electrically connected to the control box; one end of the furnace body, which is close to the fan, is provided with a flame observation hole, and the bottom of the furnace body is connected with a condensed water outlet.

In the preferred technical scheme of the utility model, the casing outside covers there is the heat preservation cotton.

The utility model has the advantages that:

the utility model provides a pair of adopt boiler of flat tubular heat exchanger of spiral, this boiler include furnace body, combustor and heat exchanger, and in the combustor stretched into the heat exchanger, the inside water diversion box that gathers that is equipped with of heat exchanger for the cold water flow that control got into the heat pipe heat transfer, cold water got into by the inlet tube and gathers the water diversion box, flows back to after gathering water diversion box, heat exchange tube in proper order and gathers the water diversion box, flows from the outlet pipe. The water collecting and distributing box can prolong the contact time of liquid in the pipe and high-temperature flue gas in the shell of the heat exchanger, increase the contact area of heat exchange, and has novel structure, high thermal efficiency and good economic benefit.

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 these drawings without creative efforts.

Wherein:

fig. 1 is a perspective view of a boiler using a spiral flat tube heat exchanger provided by the present invention;

fig. 2 is a schematic structural view of a boiler using a spiral flat tube heat exchanger provided by the present invention;

FIG. 3 is a schematic structural diagram of a heat exchanger according to the present invention;

fig. 4 is a cross-sectional view at a-a in fig. 3.

Reference numerals:

1. a furnace body; 2. a heat exchanger; 3. a burner; 4. an electromagnetic valve; 5. an air filter; 6. heat preservation cotton; 11. A flame viewing aperture; 12. a condensed water outlet; 13. a flue gas outlet; 21. a water collecting and distributing box; 22. a heat exchange pipe; 23. A housing; 24. a partition plate; 31. a fan; 32. a control box; 33. a burner head; 34. a mixer; 211. a water inlet pipe; 212. a water outlet pipe; 213. a cross partition plate; 214. a first region; 215. a second region; 216. a third region; 217. a fourth region; 331. an ignition electrode; 332. a detection electrode; 2111. a water temperature detection port; 2131. and (4) opening.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly. In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

As shown in fig. 1-4, a boiler adopting a spiral flat tube heat exchanger 2 comprises a boiler body 1, a heat exchanger 2 and a burner 3, wherein the boiler body 1 is provided with a burner mounting port and a flue gas outlet 13, the heat exchanger 2 is fixedly mounted in the boiler body 1, the burner 3 is fixed at the burner mounting port, the heat exchanger 2 comprises a shell 23 and a heat exchange tube 22, the cross section of the heat exchange tube 22 is flat, the heat exchange tube 22 is fixed in the shell 23, a water collecting and distributing box 21 is fixed in the shell 23, the water collecting and distributing box 21 is connected with a water inlet tube 211 and a water outlet tube 212, the water inlet tube 211 and the water outlet tube 212 are exposed out of the shell 23, the heat exchange tube 22 is communicated with the water collecting and distributing box 21, cold water enters the water collecting and distributing box 21 through the water inlet tube 211 and sequentially passes through the water collecting and distributing box, The heat exchange pipe 22 returns to the water collecting and distributing box 21 and flows out of the water outlet pipe 212. More specifically, the positions where the water inlet pipe 211 and the water outlet pipe 212 contact the outer wall of the housing 23 should be provided with high temperature resistant sealing rubber rings to prevent gas leakage. The water collecting and distributing box 21 can be fixed in the shell 23 through a support or a welding mode, the heat exchange tubes 22 are spirally arranged, a plurality of groups of heat exchange tubes 22 are arranged along the axial direction, the structure and the shape of each group of heat exchange tubes 22 are the same and are composed of two different heat pipes, and each group of two different heat exchange tubes 22 are wound into two layers from inside to outside along the radial direction; the multiple groups of heat exchange tubes 22 are communicated with the water collecting and distributing box 21, and the multiple groups of heat exchange tubes 22 are fixed at the bottom of the water collecting and distributing box 21 in parallel along the length direction of the water collecting and distributing box 21. More specifically, each group of the heat exchange tubes 22 is communicated with the water collecting and distributing box 21, water in the water collecting and distributing box 21 is gathered and then enters each group of the heat exchange tubes 22, and each group of the heat exchange tubes 22 can be fixed in the shell 23 through a support except that the connection part with the water collecting and distributing box 21 is fixed.

The boiler adopting the spiral flat tube heat exchanger 2 comprises a boiler body 1, a combustor 3 and a heat exchanger 2, wherein the combustor 3 extends into the heat exchanger 2, a water collecting and distributing box 21 is arranged inside the heat exchanger 2 and used for controlling the flow of cold water entering a heat pipe for heat exchange, the cold water enters the water collecting and distributing box 21 through a water inlet pipe 211, sequentially flows back to the water collecting and distributing box 21 after passing through the water collecting and distributing box 21 and the heat exchange pipe 22 and flows out of a water outlet pipe 212. The water collecting and distributing box 21 can prolong the contact time of liquid in the pipe and high-temperature flue gas in the shell 23 of the heat exchanger 2, increase the heat exchange contact area, and has novel structure, high thermal efficiency and good economic benefit. The boiler adopting the spiral flat tubular heat exchanger 2 is convenient for controlling the flow direction of liquid entering the heat exchange tube 22 so as to control the heat exchange time, and can effectively increase the heat exchange area of the flue gas and the liquid in the shell 23 and improve the heat exchange efficiency; the cross section of the heat exchange tube 22 is flat, the heat exchange tubes 22 are provided with a plurality of groups, the heat exchange tubes 22 are arranged on the water collecting and distributing box 21 in parallel, and each group of heat exchange tubes 22 are all arranged spirally, so that the heat exchanger 2 is more compact in structure, the contact heat exchange area of flue gas and liquid is increased, the heat exchange efficiency is effectively improved, and the heat exchange efficiency and the economic benefit of a boiler can be improved.

More specifically, during the specific operation, the gas and the air are mixed and enter the burner 3, and are sent into the heat exchanger 2 by the burner 3, one end of the burner 3 extends into the shell 23 of the heat exchanger 2, the mixed gas is combusted inside the heat exchanger 2, and the inside of the heat exchanger 2 is equivalent to the function of a hearth. The high-temperature flue gas generated by combustion exchanges heat with water in the heat exchange tube 22, the temperature of the gas is reduced, the temperature of the water in the heat exchange tube 22 is increased, and the hot water flows out from the outlet of the heat exchange tube 22. The high-temperature fuel gas is changed into low-temperature flue gas after heat exchange and is discharged from the flue gas outlet 13. More specifically, cold water enters the water collecting and dividing tank 21 from the water inlet pipe 211, is gradually collected in the water collecting and dividing tank 21, and then flows into the heat exchange pipe 22 from the water collecting and dividing tank 21. Because the cross section of the heat pipe is flat, the heat exchange pipes 22 are provided with a plurality of groups, the heat exchange pipes 22 are arranged on the water collecting and distributing box 21 in parallel, and each group of heat exchange pipes 22 are spirally arranged, the contact area between the liquid in the heat exchange pipes 22 and the high-temperature flue gas in the shell 23 is increased, and the contact time is prolonged. Meanwhile, the flat heat exchange tubes 22 reduce the open area between the heat exchange tubes 22, effectively utilize the space in the shell 23, and make the structure of the heat exchanger 2 more compact and the space utilization rate higher, so the boiler has higher thermal efficiency and good economic benefit.

Further, a cross partition plate 213 is fixed in the water collecting and distributing box 21, and the cross partition plate 213 divides the water collecting and distributing box 21 into a first area 214, a second area 215, a third area 216 and a fourth area 217 which are independent of each other. Referring to fig. 2, further, the water inlet pipe 211 is communicated with the first zone 214, the bottom of the first zone 214 is communicated with the water inlet of the heat exchange pipe 22, and the bottom of the second zone 215 is communicated with the water outlet of the heat exchange pipe 22; the cross partition 213 of the second area 215 and the third area 216 is provided with an opening 2131. Referring to fig. 4, the second area 215 is communicated with the third area 216 through an opening 2131 on the cross partition 213, the bottom of the third area 216 is communicated with the water inlet of the heat exchange tube 22, the bottom of the fourth area 217 is communicated with the water outlet of the heat exchange tube 22, and the fourth area 217 is communicated with the water outlet tube 212. More specifically, in a specific use process, the cross partition 213 is fixed in the local concentration water distribution box 21 by welding, the water inlet pipe 211 is used for the entry of external cold water, the cold water enters from the water inlet pipe 211 and is dispersed in the first zone 214, so that the first zone 214 is also a cold water dispersion zone, the cold water in the first zone 214 is gathered and enters the heat exchange pipe 22, and exchanges heat with the high-temperature flue gas in the shell 23 in the heat exchange pipe 22, the temperature is increased, and then the cold water flows back to the second zone 215, so that the second zone 215 is also called a warm water polymerization zone. The warm water in the second area 215 flows to the third area 216 through the through holes on the cross partition 213, and is dispersed in the third area 216, so that the third area 216 is also called a warm water dispersing area, and the warm water in the third area 216 flows into the heat exchange pipe 22 communicated with the third area 216, exchanges heat with the high-temperature flue gas in the shell 23, and rises in temperature again to become hot water. The hot water is collected in the fourth area 217, so the fourth area 217 also becomes a hot water polymerization area, and then the hot water in the fourth area 217 flows out through the outlet pipe 212 for people to use.

Further, the burner 3 comprises a fan 31, a control box 32, a combustion head 33 and a mixer 34, the fan 31 is fixed at one end of the furnace body 1, an air outlet pipe of the fan 31 is connected with the combustion head 33, the control box 32 is fixed on the fan 31, the mixer 34 is installed at an air inlet of the fan 31, the combustion head 33 is installed at the joint of the fan 31 and the furnace body 1, an ignition electrode 331 of the combustion head 33 is located in a hearth of the furnace body 1, and the ignition electrode 331 of the burner 3 is electrically connected with the control box 32; one end of the mixer 34 is connected with a gas source, the other end of the mixer is connected with air, the air and the gas enter the mixer 34 to be mixed, the air and the gas are sent to the combustion head 33 under the action of strong suction force of the fan 31, and the ignition electrode 331 starts to burn after being ignited. The gas and air mixed by the mixer 34 have higher combustion efficiency and better combustion effect, and more particularly, the mixer 34 is a venturi mixer.

Further, the cross section of the heat exchange tube 22 is designed to be flat with a wide middle and narrow ends, and the ratio of the width of the widest part to the width of the narrowest part of the heat exchange tube 22 is 5: 1-3: 2. furthermore, each group of spiral heat exchange tubes 22 is provided with 2-6 circles along the axial direction, and the distance between two adjacent circles of heat exchange tubes 22 is 0.5mm-3 mm; the distance between two adjacent groups of heat exchange tubes 22 is 0.5mm-3 mm. In order to fully balance the heat exchange area and make the structure of the heat exchanger 2 more compact, and simultaneously to make the high-temperature flue gas better enter the gap between the heat exchange tubes 22 and make the high-temperature flue gas more fully contact with the heat exchange tubes 22, the heat exchange tubes 22 are arranged in a structure with a wide middle and two narrow ends, and the ratio of the width of the widest part to the width of the narrowest part of the heat exchange tubes 22 is 5: 1-3: 2, the distance between two adjacent circles of heat exchange tubes 22 is 0.5mm-3mm to improve the heat exchange efficiency of the heat exchanger 2, and the distance between two adjacent groups of heat exchange tubes 22 is 0.5mm-3mm to make the structure of the heat exchanger 2 more compact.

Further, the shell 23 is cylindrical, the length direction of the water collecting and distributing box 21 is consistent with that of the shell 23, and a burner installation opening and a flue gas outlet 13 are respectively arranged at two ends of the shell 23 in the length direction. A temperature detector is fixed at the smoke outlet 13. The temperature detector is used to detect the temperature at the flue gas outlet 13, which is directly commercially available.

Further, a partition plate 24 is arranged in the shell 23, the shape of the partition plate 24 is matched with the shape of the spiral heat exchange tube 22, the outer diameter of the partition plate 24 is larger than or equal to the outer diameter of the outermost layer of the spiral heat exchange tube 22, and the partition plate 24 is fixed among a plurality of groups of the heat exchange tubes 22; referring to fig. 2, further, a flue gas cavity for flue gas circulation is arranged between the outermost outer wall of the spiral heat exchange tube 22 and the inner wall of the shell 23, and the height of the flue gas cavity in the radial direction is greater than half of the diameter of the flue gas outlet 13. The partition plate 24 plays a role in guiding and prolonging the residence time of the flue gas in the shell 23, after the high-temperature flue gas enters the shell 23, the high-temperature flue gas is diffused among the heat exchange tubes 22, then flows to the partition plate 24, is blocked by the partition plate 24, cannot flow forwards, and then is diffused and dispersed along the radial direction of the partition plate 24, namely, the high-temperature flue gas is diffused and dispersed along the radial direction of the spiral heat exchange tubes 22, so that the contact time between the high-temperature flue gas and the outer walls of the heat exchange tubes 22 is prolonged, and the heat exchange efficiency is higher. The high-temperature flue gas diffused along the partition plate 24 flows to the flue gas cavity, bypasses the partition plate 24 from the flue gas cavity, flows into the shell 23 downstream of the partition plate 24, and exchanges heat with water in the heat exchange tubes 22 in the shell 23 again.

Further, an air port of the mixer 34 is connected with an air filter 5, a gas port is connected with an electromagnetic valve 4, the electromagnetic valve 4 is externally connected with a gas source, a water temperature detection port 2111 is formed in the water inlet pipe 211, a detection electrode 332 is arranged on the combustion head 33, and the detection electrode 332 is electrically connected with the control box 32; one end of the furnace body 1 close to the fan 31 is provided with a flame observation hole 11, and the bottom of the furnace body 1 is connected with the condensed water outlet 12. The air filter 5 filters the air entering the mixer 34 to prevent the air from containing excessive impurities to affect the combustion efficiency, the water temperature detection port 2111 is used for detecting the temperature of the cold water entering the heat exchanger 2, and the detection electrode 332 is used for detecting the working condition of the combustion head 33. The flame observation hole 11 is used for observing the combustion condition of the fuel gas in the furnace body 1, and the condensed water outlet 12 is used for discharging the condensed water in the furnace body 1, so that safety accidents caused by excessive condensed water accumulation are avoided.

Further, the shell 23 is covered with heat preservation cotton 6; the heat preservation cotton 6 can reduce the heat loss of the shell 23 and improve the heat exchange efficiency.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. The utility model provides an adopt flat tub of heat exchanger's of spiral boiler, includes furnace body, heat exchanger and combustor, it has combustor installing port and exhanst gas outlet to open on the furnace body, heat exchanger fixed mounting be in the furnace body, the combustor is fixed combustor installing port, its characterized in that: the heat exchanger includes casing and heat exchange tube, the transversal platykurtic of personally submitting of heat exchange tube, the heat exchange tube is fixed inside the casing, the inside water distribution case that gathers that is fixed with of casing, it has inlet tube and outlet pipe to gather on the water distribution case, the inlet tube with the outlet pipe expose in outside the casing, the heat exchange tube with gather the water distribution case intercommunication, cold water by the inlet tube gets into gather the water distribution case, process in proper order gather the water distribution case flow back behind the heat exchange tube gather the water distribution case, follow the outlet pipe flows.

2. The boiler adopting the spiral flat tube heat exchanger according to claim 1, wherein:

the heat exchange tubes are spirally arranged, a plurality of groups of heat exchange tubes are arranged along the axial direction, each group of heat exchange tubes is identical in structure and shape and consists of two different heat pipes, and each group of two different heat exchange tubes are wound into two layers from inside to outside along the radial direction; the heat exchange tubes are communicated with the water collecting and distributing box, and the heat exchange tubes are fixed at the bottom of the water collecting and distributing box in parallel along the length direction of the water collecting and distributing box.

3. The boiler adopting the spiral flat tube heat exchanger according to claim 2, wherein:

a cross partition plate is fixed in the water collecting and distributing box, and the water collecting and distributing box is divided into a first area, a second area, a third area and a fourth area which are mutually independent by the cross partition plate.

4. The boiler adopting the spiral flat tube heat exchanger according to claim 3, wherein:

the water inlet pipe is communicated with the first area, the bottom of the first area is communicated with the water inlet of the heat exchange pipe, and the bottom of the second area is communicated with the water outlet of the heat exchange pipe; the second area with the third area be equipped with the opening on the cross baffle, the second area pass through opening on the cross baffle with the third area intercommunication, third area bottom with the water inlet intercommunication of heat exchange tube, fourth area bottom with the delivery port intercommunication of heat exchange tube, the fourth area with the outlet pipe intercommunication.

5. The boiler adopting the spiral flat tube heat exchanger according to claim 1, wherein:

the combustor includes fan, control box, combustion head and blender, the fan is fixed furnace body one end, the play tuber pipe one end of fan with the combustion head is connected, the control box is fixed on the fan, the blender is installed the air intake department of fan, the combustion head is installed the fan with the handing-over department of furnace body, just the ignition electrode of combustion head is located in the furnace of furnace body, and be close to the combustion head sets up, the ignition electrode of combustor with the control box electric connection.

6. The boiler adopting the spiral flat tube heat exchanger according to claim 2, wherein:

the cross section of the heat exchange tube is designed into a flat shape with a wide middle part and narrow two ends, and the ratio of the width of the widest part to the width of the narrowest part of the heat exchange tube is 5: 1-3: 2; each group of spiral heat exchange tubes is provided with 2-6 circles along the axial direction, and the distance between every two adjacent circles of heat exchange tubes is 0.5-3 mm; the distance between two adjacent groups of heat exchange tubes is 0.5mm-3 mm.

7. The boiler adopting the spiral flat tube heat exchanger according to claim 2, wherein:

the casing is the tube-shape, the length direction that gathers the water box with the length direction of casing is unanimous, follows casing length direction's both ends are equipped with combustor installing port and exhanst gas outlet respectively, exhanst gas outlet department is fixed with thermodetector.

8. The boiler adopting the spiral flat tube heat exchanger according to claim 7, wherein:

a partition board is arranged in the shell, the shape of the partition board is matched with that of the spiral heat exchange tube, the outer diameter of the partition board is larger than or equal to that of the outermost layer of the spiral heat exchange tube, and a flue gas cavity for flue gas circulation is formed between the outer wall of the outermost layer of the spiral heat exchange tube and the inner wall of the shell, wherein the partition board is fixed among the plurality of groups of heat exchange tubes; the height of the cavity in the radial direction is greater than half the diameter of the flue gas outlet.

9. The boiler adopting the spiral flat tube heat exchanger according to claim 5, wherein:

an air filter is connected to an air port of the mixer, an electromagnetic valve is connected to a gas port, the electromagnetic valve is externally connected with a gas source, a water temperature detection port is formed in the water inlet pipe, a detection electrode is arranged on the combustion head, and the detection electrode is electrically connected with the control box; one end of the furnace body, which is close to the fan, is provided with a flame observation hole, and the bottom of the furnace body is connected with a condensed water outlet.

10. The boiler adopting the spiral flat tube heat exchanger according to claim 1, wherein:

the shell is covered with heat preservation cotton.