WO2014044208A1

WO2014044208A1 - Forced spiral finned coil condensation heat-supplying heat exchanger

Info

Publication number: WO2014044208A1
Application number: PCT/CN2013/083900
Authority: WO
Inventors: 崔树庆; 徐斌; 范海源
Original assignee: 苏州成强换热器有限公司
Priority date: 2012-09-21
Filing date: 2013-09-22
Publication date: 2014-03-27
Also published as: US20150007779A1; CN102901225A; CN102901225B

Abstract

A forced spiral finned coil condensation heat-supplying heat exchanger, comprising a housing (3), and accommodated in the housing (3), a burner (6) and a plurality of spiral finned tube coils (8). The housing (3) has arranged thereon a water inlet (14), a water outlet (13), and an exhaust opening (12). The burner (6) is connected to an air and fuel gas intake apparatus. The burner (6) is arranged at the upper part of the housing (3). Spiral finned coil bundles (4) are coaxially installed around the burner (6). An exhaust pipe (15) consisting of the plurality of tightly arranged spiral finned coils (8) is arranged below the burner (6). The exhaust pipe (15) is emptied via the exhaust opening (12). The water inlet (14) is in communication with the plurality of tightly arranged spiral finned coils (8) below the burner (6). The plurality of tightly arranged spiral finned coils (8) below the burner (6) are in communication with the spiral finned coil bundles (4) around the burner (6). The spiral finned coil bundles (4) around the burner (6) are in communication with the water outlet (13). The heat exchanger enhances the heat exchange at the flue gas side, while at the same time allows for further reduction in the overall size of the heat exchanger.

Description

Forced spiral fin coil condensing heat supply heat exchanger

The invention belongs to the field of thermal equipment, and in particular relates to a forced spiral fin coil condensing heating heat exchanger.

Background technique

As early as the oil crisis in the Middle East in the 20th century, in order to save energy, a highly heat-efficient condensing boiler was developed in Europe, which is characterized by a thermal efficiency increase of more than 10% compared with conventional design boilers. Since the exhaust temperature of the boiler is lowered to above the dew point, a large amount of water vapor in the flue gas condenses and releases latent heat of vaporization, which has obvious energy-saving effect, and the condensing heat exchanger applied to the condensing boiler is developed according to the principle thereof. .

The heat available for gas combustion includes the sensible heat of the flue gas and the latent heat of the water vapor in the flue gas. The ordinary heat exchanger is limited by its structure, and the exhaust gas temperature is high, and only the low calorific value of the gas can be utilized; the condensing heat exchanger can not only fully absorb the sensible heat of the flue gas but also absorb the latent heat due to the low exhaust gas temperature. , using the high calorific value of the flue gas. Therefore, the heat utilization efficiency of the condensing heat exchanger can be greatly improved. In order to fully absorb the heat of the high-temperature flue gas and collect the condensed water, it generally adopts the secondary heat exchange mode. When working, the high-temperature flue gas enters the sensible heat exchanger and the condensing section heat exchanger from bottom to top in turn, and the water flow direction is opposite. First, the heat exchanger of the condensation section is passed through, and the cold water absorbs the residual heat of the high-temperature flue gas in the heat exchanger of the condensation section, and then enters the main heat exchanger to absorb the sensible heat of the flame. After the heat exchanger absorbs sensible heat and latent heat, the flue gas temperature will drop to normal temperature and be discharged from the upper flue. In order to discharge the flue gas safely and reliably, the condensing heat exchanger uses forced exhaust to exhaust the flue gas, so that the flue gas is in the flue gas. The water vapor condenses as much as possible, which increases the amount of latent heat and sensible heat absorbed by the heated water, and the better the energy saving effect. Therefore, the condensing heat exchanger utilizes the heat lost as a smoke exhaust, and the heat loss of the exhaust gas becomes useful heat. The degree of effective utilization of this part of heat determines the energy saving effect of the condensing heat exchanger.

However, the flue gas entering the condensing heat exchanger is generally in a superheated state. As the flue gas temperature decreases and the water vapor condenses, the flue gas gradually transitions to a saturated state and finally reaches a saturated state. According to the experimental measurement, when the exhaust gas temperature is about 50 ° C, the flue gas outlet state of the condensing heat exchanger is close to saturation state, and the degree of proximity is related to the composition of the flue gas, the heat exchanger structure and the heat and mass transfer process. Experimental data shows that in the prior art, there are still many "dead zone" phenomena or "short circuit" states in the flow path of the flue gas, which reduces the heat exchange efficiency. 1. The heating heat exchanger of the traditional non-condensing boiler is made of carbon steel or cast iron. The exhaust temperature of the design is generally higher than 150 °C, and the large amount of sensible heat released by the condensation of water vapor in the absorption flue gas is not considered. Latent heat, no condensation produced.

2. Condensing boilers are characterized by high efficiency, energy saving and environmental protection. They are the development direction of the boiler industry and have been widely promoted. Condensing boilers generate a large amount of weakly acidic condensate. If the condensing boiler heating heat exchanger is made of materials such as steel or cast iron, the life of the condensing boiler will be seriously shortened. Therefore, the condensing boiler heating heat exchanger must use stainless steel or cast aluminum. Processed. At present, it is mostly made of stainless steel light pipe or cast aluminum.

3. The technology for processing heat exchangers with cast aluminum molds is basically mature, but only 500 kW heating heat exchangers can be produced. The large-scale cast aluminum parts have the problems of high mold cost, complicated processing technology and high product scrap rate, which makes it impossible to directly process large-scale heat supply heat exchangers with cast aluminum molds.

4. The heat efficiency of these two heat exchangers is up to 96% under normal conditions.

5. When the return water temperature of the boiler is higher than 60 °C, the boiler will not produce condensed water. At this time, the heat exchanger can only recover the sensible heat in the flue gas, and the thermal efficiency is only about 87%.

6. Air preheaters are generally used in large boilers such as power stations. Not used in heating boilers.

7. Conventional heating heat exchangers are designed to produce different types of heating heat exchangers according to different needs of customers. The heat exchangers are different in size and the required parts are different, which is not conducive to industrial mass production.

Summary of the invention

The present invention has been made in view of the problems of the prior art described above.

Therefore, the technical problem to be solved by the present invention is how to overcome the problem that the heat exchanger structure in the prior art is insufficient to cause insufficient heat exchange of the flue gas flow path, and how to improve the heat transfer surface structure to increase the heat exchange area and increase the heat exchange area. The purpose of thermal efficiency, at the same time, allows the boiler to be made smaller at the same power, taking up less volume, and how to intimately combine the air preheater into the heat exchanger for secondary heat transfer and air intake. The initial temperature is further reduced by the exhaust gas temperature.

In order to solve the above technical problem, the present invention provides the following technical solution: A forced spiral fin coil condensing heat supply heat exchanger, comprising a casing, a burner disposed in the casing and a plurality of spiral fin coils, a shell The body is provided with a water inlet, a water outlet and a smoke exhaust port, and the burner is connected with the air and gas inlet device, the burner is located at the upper part of the casing, and a plurality of spiral finned coil tube bundles are coaxially mounted around the burner, and the combustion is performed. A smoke exhaust pipe composed of a plurality of tightly arranged spiral finned coils is disposed under the device, and the exhaust pipe is exhausted through the exhaust port; the water inlet is connected with a plurality of closely arranged spiral fin coils under the burner, and the fuel is connected. A plurality of closely arranged spiral fin coils are connected to the spiral fin coils around the burner under the burner, and the spiral fin coils around the burner are connected to the water outlet.

A preferred embodiment of the forced spiral fin coil condensing heat supply heat exchanger according to the present invention, wherein: the spiral finned coil bundle and the plurality of closely arranged spiral fin coils are adjacent The fins are bent or extruded, and the fins on both sides of the spiral fin coil are folded at an angle, and the two inner folds formed by the finned tubes are parallel or at a certain angle.

A preferred embodiment of the forced spiral fin coil condensing heat supply heat exchanger according to the present invention, wherein: the spiral fin coil tube bundle and the plurality of closely arranged spiral fin coils are composed of a plurality of The spiral fin coils are assembled upside down.

As a preferred embodiment of the forced spiral fin coil condensing heat supply heat exchanger of the present invention, wherein: the outer side of the spiral finned coil bundle is provided with an outer deflector.

As a preferred embodiment of the forced spiral fin coil condensing heat supply heat exchanger of the present invention, wherein: the outer deflector is a "V" type spiral baffle, and the outer side of the spiral fin coil The adjacent portions of the tightly arranged spiral fin coils are offset from the flow guiding ports of the outer deflector.

A preferred embodiment of the forced spiral fin coil condenser heat supply heat exchanger according to the present invention, wherein: a plurality of tightly arranged spiral fin coils constituting the exhaust duct below the burner are disposed inside Deflector.

As a preferred embodiment of the forced spiral fin coil condensing heat supply heat exchanger of the present invention, wherein: the inner baffle is a cylindrical diversion tube with a plurality of holes and/or slits attached thereto The plate is attached to the inner side of the spiral fin coil, and the adjacent portions of the plurality of tightly arranged spiral fin coils are offset from the inner flow guides of the inner deflector.

As a preferred embodiment of the forced spiral fin coil condensing heat supply heat exchanger of the present invention, wherein: the exhaust pipe is provided with an air preheater; the air preheater passes through the exhaust pipe The air outlet is connected to the air intake device; the exhaust port is a four-type exhaust port, the upper end of which is a smoke exhaust port, the lower end of which is a condensate outlet, and the middle part is an air inlet of the air preheater.

As a preferred embodiment of the forced spiral fin coil condensing heat supply heat exchanger of the present invention, wherein: the air preheater in the exhaust pipe is one or more rectangular or cylindrical air intake pipes .

As a preferred embodiment of the forced spiral fin coil condensing heat supply heat exchanger of the present invention, wherein: the burner is located at the lower part of the casing, and a plurality of fins are tightly mounted around the burner coaxially around the burner. a uniformly distributed spiral finned coil bundle with a plurality of closely arranged spiral fins disposed above the burner a smoke exhaust pipe composed of coils, the exhaust pipe is exhausted through the exhaust port; the water inlet is connected with a plurality of closely arranged spiral fin coils above the burner, and a plurality of tightly arranged spiral fin coils and burners are arranged above the burner The surrounding spiral fin coils are connected, and the spiral fin coils around the burner are in communication with the water outlet.

By adopting the technical solution of the present invention, the following beneficial technical effects are obtained:

The overall structural arrangement of the present invention can increase heat exchange efficiency. The invention adopts a two-stage counterflow heat exchange arrangement structure in which a burner is arranged above and a smoke exhaust port is arranged below, and the flue gas after combustion of the burner flows downward from above the heat exchanger, first passing through the fin tube around the burner. And the outer deflector, then pass through the finned tube and the inner deflector of the exhaust pipe, along the exhaust pipe, and flow back to the exhaust port. The water inlet is arranged at the lower exhaust port, the water outlet is arranged at the upper part of the heat exchanger, the water passes through the water inlet and the fin tube, and the two ends of the heat exchanger are connected to the cavity of the upper and lower finned tube bundle, for example, the upper water main pipe and The lower water main pipe is finally discharged through the water outlet. By adopting the reverse flow heat exchange mode, the water outlet temperature is more likely to be higher than the exhaust gas temperature, which can greatly improve the heat exchange efficiency and increase the heat exchange amount.

The fin tube after the secondary processing of the present invention can significantly improve the heat exchange efficiency. The invention adopts a spiral finned coil as a basic component of a forced spiral fin coil condensing heat supply heat exchanger, and increases the heat exchange efficiency by adding fins on the surface of the heat exchange tube to increase the outer surface area of the heat exchange tube. The purpose is to enhance the heat exchange on the flue gas side, which can further reduce the volume of the entire heat exchanger. By subjecting the fins to secondary processing, such as bending or extrusion, the spacing between the tubes of the finned tubes is significantly reduced, thereby allowing the flue gas stream to more fully contact the light pipe, enhancing heat transfer and improving turbulence. The degree of flow pulsation increases the convective heat transfer coefficient, effectively achieves the purpose of enhancing heat transfer, improves the heat exchange efficiency, and further reduces the volume of the entire heat exchanger.

The invention is provided with an outer and inner deflector, which is beneficial for reducing the "dead zone" of the flue gas flow and further improving the shell flow velocity distribution. In the present invention, the flow path of the flue gas is closely attached to the fins and the light pipe by adding a plurality of outer baffles located outside the outer circumference of the circumferential finned tube bundle and the inner deflector located inside the finned tube of the exhaust duct. It can further enhance heat transfer, significantly improve the shell flow velocity distribution, and reduce the "dead zone" or "short circuit" of the flue gas stream.

The present invention is further provided with an air preheater to improve efficiency. In the present invention, the air preheater is skillfully combined in the exhaust duct of the heat exchanger. When the outdoor air reaches below -20 °C in winter, the residual heat of the flue gas is used to increase the temperature of the air entering the furnace, thereby further reducing the exhaust temperature. , the efficiency is above 98%, with obvious effect.

DRAWINGS

1 is a main body of a forced spiral finned coil condensing heat supply heat exchanger according to an embodiment of the present invention. Body diagram.

2 is a perspective view of the forced spiral fin coil condenser heat supply heat exchanger of the present invention.

Fig. 3 is a cross-sectional view showing the structure and working principle of a forced spiral finned coil condensing heat supply heat exchanger according to an embodiment of the present invention.

Figure 4 is a right side cross-sectional view showing the structure of a forced spiral fin coil condenser heat supply heat exchanger with an air preheater according to the present invention.

Figure 5 is a right side cross-sectional view of the forced spiral fin coil condensing heat supply heat exchanger with the air preheater positioned above in an embodiment of the present invention.

Fig. 6 is a schematic view showing a spiral finned coiled tube bundle in which a plurality of spiral finned coils are closely arranged according to the present invention.

Figure 7 is a front elevational view of the spiral finned coil tube bundle of the present invention.

Figure 8 is a cross-sectional view taken along line 7A-A.

Fig. 9 is an enlarged schematic view showing the direction B of Fig. 8.

Fig. 10 is a schematic view showing the working principle of the flue gas passing through the outer deflector.

Figure 1 is a schematic diagram of the working principle of the flue gas passing through the deflector.

Figure 12 is a schematic right side elevational view of a forced spiral finned coil condensing heat supply heat exchanger with two air preheaters in accordance with still another embodiment of the present invention.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the accompanying drawings, which are merely used to explain the present invention and are not to be construed as limiting.

As shown in FIG. 1 to FIG. 12, the method includes: an upper water main pipe 1, a front baffle 2, a casing 3, a spiral finned coil bundle 4, an outer baffle 5, a burner 6, and an inner baffle 7, a plurality of tightly arranged spiral fin coils 8, a lower water main pipe 9, a tailgate 10, an air preheater 1 1, a smoke exhaust port 12, a water outlet 13, a water inlet 14, a smoke exhaust pipe 15, and a condensed water outlet 16 , air inlet 17.

A forced spiral fin coil condensing heat supply heat exchanger according to an embodiment of the present invention will be described with reference to Figs. As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, a forced spiral fin coil condensing heat supply heat exchanger comprises a casing 3, a burner 6 and a spiral finned coil bundle 4 and a plurality of tight The spiral fin coils 8 are arranged, and a set of upper water main pipe 1 and a lower water main pipe 9 are disposed on both sides of the casing 3, wherein one side of the upper water main pipe 1 and the lower water main pipe 9 are connected, and the other side is lower. The jellyfish tube 9 is fitted with a water inlet 14, and the upper water mother tube 1 is provided with a water outlet 13. A plurality of spiral fin coils are placed upside down and assembled into a group. Burner 6 A spiral finned coil bundle 4 is disposed around. Below the burner 6, there is disposed a smoke exhaust duct 15 composed of a plurality of closely arranged spiral fin coils 8.

A front baffle 2 and a tailgate 10 are mounted on both inner sides of the side casing, and the side casing is welded and fixed to the front baffle 2 and the tailgate 10. In one embodiment, the front baffle 2 and the tailgate 10 are all made of an insulating material.

As shown in the figure, the heat exchanger housing 3 is provided with a water outlet 13 and a water inlet 14. The casing 3 is further provided with a smoke exhaust port 12, wherein the smoke exhaust port 12 is a four-type exhaust port 12, the upper end of which is a smoke exhaust port 12, the lower end of which is a condensate outlet 16 and the middle part of which is an air preheater 1 1 air inlet 17.

As shown in FIG. 3, FIG. 3 is a cross-sectional view showing the structure and working principle of a forced spiral finned coil condensing heat supply heat exchanger according to an embodiment of the present invention. In this embodiment, the forced spiral fin coil condensing heat supply heat exchanger comprises a casing 3, a burner 6 disposed in the casing 3 and a plurality of spiral fin coils, and the casing 3 is provided with The water inlet 14, the water outlet 13 and the smoke exhaust port 12, the burner 6 is connected to the air and gas inlet device, the burner 6 is located at the upper part of the casing 3, and the spiral finned coil bundle 4 is coaxially mounted around the burner 6. An outer baffle 5 is disposed on an outer side of the spiral finned coil bundle 4, and the outer baffle 5 is a "V"-shaped spiral baffle, which is attached to the outer side of the spiral finned coil, and closely arranged spirals The adjacent portions of the fin coils are offset from the flow guiding ports of the outer deflector 5; below the burner 6, a exhaust duct 15 composed of a plurality of closely arranged spiral fin coils 8 is disposed, and the exhaust duct 15 passes The exhaust port 12 is evacuated; the exhaust pipe 15 is provided with an air preheater 1 1 including one or more rectangular parallelepiped or cylindrical air intake pipes, and the air preheater 1 1 is an intake pipe; a plurality of closely arranged spiral fin disks under the water inlet 14 and the burner 6 The tube 8 is connected, and a plurality of closely arranged spiral fin coils 8 under the burner 6 are in communication with the spiral fin coils around the burner 6, and the spiral fin coils around the burner 6 are in communication with the water outlet 13.

An inner deflector 7 is disposed inside the plurality of closely arranged spiral fin coils 8 constituting the exhaust duct 15 below the burner 6, and the inner deflector 7 is provided with a plurality of holes and/or Or a slit cylindrical baffle is attached to the inner side of the spiral fin coil, and the adjacent portions of the plurality of tightly arranged spiral fin coils 8 are offset from the flow guiding ports of the inner deflector 7.

The air preheater 1 1 is connected to the air intake device through the exhaust pipe 15; the exhaust port 12 is a four-type exhaust port 12, the upper end of which is a smoke exhaust port 12, and the lower end of which is a condensate outlet 16, the middle is the air inlet 17 of the air preheater 1 1 .

As shown in FIG. 4, FIG. 4 is a forced spiral fin coil with an air preheater according to the present invention. A right side cross-sectional view of the structure of the condensing heat exchanger. From this working principle diagram, it can be clearly understood that the spiral finned coil bundle 4 is located above a plurality of closely arranged spiral fin coils 8, a spiral finned coil bundle 4 and a plurality of closely arranged spiral finned coils 8 Parallel. The burner 6 is coaxially mounted in the spiral finned coil bundle 4, and the burner 6 is connected to the air and gas inlet means. Below the burner 6, there is disposed a smoke exhaust duct 15 composed of a plurality of closely arranged spiral fin coils 8.

The invention adopts a secondary heat exchange mode, adopts a reverse flow arrangement heat exchange, and the high temperature flue gas passes through the spiral finned coil bundle 4 from the top to the bottom, and a plurality of tightly arranged spiral fin coils 8; and the water flow direction is opposite, first pass A plurality of closely arranged spiral fin coils 8 are passed through the spiral finned coil bundle 4. The air preheater 1 1 is disposed in the exhaust duct 15 to exchange heat with the flue gas, thereby increasing the air temperature entering the furnace while further reducing the exhaust gas temperature.

In this embodiment, the water inlet port 14, a plurality of closely arranged spiral fin coils 8, the upper water mother pipe 1, the spiral fin coil pipe bundle 4, the lower water mother pipe 9, and the water outlet 13, constitute a circuit for the water heating process.

As shown in Fig. 5, Fig. 5 is a right side sectional view showing the forced-screw-coil condensing heat supply heat exchanger when the air preheater is located above in the embodiment of the present invention. In this embodiment, the burner 6 is located at the lower portion of the casing 3, and a set of spiral finned coil bundles 4 uniformly surrounded by a plurality of fin straight tubes is coaxially mounted around the burner 6, and the burner 6 is disposed above the burner 6. a smoke exhaust pipe 15 composed of a casing 3 and a plurality of closely arranged spiral fin coils 8, the exhaust pipe 15 is evacuated through the exhaust port 12; the water inlet 14 and the burner 6 are arranged in a plurality of tightly arranged spiral fin disks The tube 8 is connected, and a plurality of closely arranged spiral fin coils 8 are connected to the spiral fin coils around the burner 6 above the burner 6, and the spiral fin coils around the burner 6 are in communication with the water outlet 13.

At this time, the high-temperature flue gas is arranged in a countercurrent flow, and the first-stage sensible heat exchange and the second-stage condensation heat exchange are performed from bottom to top; while the water flow direction is opposite, first, the second-stage condensation heat exchange is performed, and then the first-stage sensible heat exchange is performed. After the secondary condensing heat transfer absorbs the residual heat of the flue gas, it returns to the first-stage sensible heat transfer to absorb the sensible heat of the high-temperature flue gas. The air preheater 1 passes through the secondary condensing heat exchanger and the flue gas carries out three stages. Heat exchange increases the temperature of the air entering the heat exchanger and further reduces the exhaust temperature.

As shown in FIG. 6 to FIG. 11 , the spiral finned coil bundle 4 is composed of a plurality of spiral fin coils upside down and folded, and the fins adjacent to the spiral fin coil bundle 4 are bent or The extrusion process causes the fins to be folded at an angle along the axial direction of the tube bundle. Of course, the cutting process can also be performed directly. Finned tubes The inner folds on both sides can be parallel or at an angle to facilitate the close arrangement of adjacent finned tubes.

As shown in FIG. 10, FIG. 10 is a schematic view showing the working principle of the flue gas passing through the outer deflector. Spiral fin An outer baffle 5 is disposed on the outer side of the coiled tube bundle 4, and the outer baffle 5 is a "V"-shaped spiral baffle, which is attached to the outer side of the spiral finned coil, and closely arranged spiral finned coils The adjacent portions are offset from the flow guiding ports of the outer deflector 5.

As shown in FIG. 11 , FIG. 11 is a schematic diagram of the working principle of the flue gas inner deflector, and a plurality of closely arranged spiral fin coils 8 are combined into a cylindrical shape, and the plurality of closely arranged spiral fins are arranged. The adjacent fins of the coiled tube 8 are bent or pressed to fold the fins at an angle along the axial direction of the tube bundle. Of course, the cutting process can also be performed directly. The inner side of the plurality of closely arranged spiral fin coils 8 is provided with an inner baffle 7 which is a cylindrical baffle with a plurality of holes and/or slits attached thereto, and The inner side of the spiral fin coil is fitted, and the adjacent portions of the plurality of closely arranged spiral fin coils 8 are offset from the flow guiding ports of the inner deflector 7.

As shown in Fig. 12, Fig. 12 is a schematic right side view showing a forced spiral fin coil condenser heat supply heat exchanger with two air preheaters in still another embodiment of the present invention. An air preheater 1 1 having two rectangular air intake pipes is disposed in the exhaust duct 15.

In summary, the present invention starts from the study of how to improve the structure of the heat transfer surface, and increases the heat exchange area to improve the heat exchange efficiency. The inner folded spiral fin coil is used as the basic component of the forced spiral fin coil condenser heat supply heat exchanger, which enhances the heat exchange on the flue gas side and further reduces the volume of the entire heat exchanger.

Through the guiding design of the outer deflector 5 and the inner deflector 7, the flow path of the flue gas is closely attached to the finned tube, further enhancing heat exchange, significantly improving the flow velocity distribution of the shell-side fluid, and reducing the "dead zone" of the flue gas flow. " or "short circuit" phenomenon. Invented, the air preheater 1 1 is skillfully combined in the heat exchanger. Experiments show that when the outdoor air reaches below -20 ° C in winter, the residual heat of the flue gas is used to increase the temperature of the air entering the furnace while further reducing the exhaust gas temperature. , making the efficiency reach 98% or more.

At the same time, the invention has a modular design of key components, is easy to mass-produce, reduces the production difficulty of the heat exchanger, and saves production costs.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and the present invention is not limited thereto. Although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be Modifications or equivalents are intended to be included within the scope of the appended claims.

Claims

Rights request

1. A forced spiral fin coil condensation heat exchanger, including a shell (3), a burner (6) arranged in the shell (3) and a spiral fin coil, the shell (3) It is provided with a water inlet (14), a water outlet (13) and a smoke exhaust port (12), and the burner (6) is connected to the air and gas intake device. It is characterized by:

The burner (6) is located at the upper part of the casing (3). A spiral fin coil tube bundle (4) is coaxially installed around the burner (6). A plurality of closely arranged spiral fin disks are provided below the burner (6). The smoke exhaust pipe (15) consists of a pipe (8), and the smoke exhaust pipe (15) is exhausted through the smoke exhaust port (12);

The water inlet (14) is connected to a plurality of closely arranged spiral fin coils (8) below the burner (6), and a plurality of closely arranged spiral fin coils (8) below the burner (6) are connected to the burner (6) The surrounding spiral fin coils are connected to each other, and the spiral fin coils around the burner (6) are connected to the water outlet (13).

2. The forced spiral fin coil condensing heat exchanger according to claim 1, characterized in that: the spiral fin coil tube bundle (4) and the plurality of closely arranged spiral fin coils (8) Adjacent fins are bent or extruded. The fins on both sides of the spiral fin coil are folded in at a certain angle. The two inward folding surfaces formed by the fin tube are parallel or at a certain angle.

3. The forced spiral fin coil condensing heat exchanger according to claim 1, characterized in that: the spiral fin coil tube bundle (4) and the plurality of closely arranged spiral fin coils ( 8) They are composed of a plurality of spiral fin coils placed upside down and attached together.

4. The forced spiral fin coil condensing heat exchanger according to claim 1, characterized in that: an outer guide plate (5) is provided on the outside of the spiral fin coil tube bundle (4).

5. The forced spiral fin coil condensing heat exchanger according to claim 4, characterized in that: the outer baffle (5) is a "V" shaped spiral baffle, and the spiral fin is The outer sides of the coils fit together, and the adjacent parts of the closely arranged spiral fin coils are staggered with the guide openings of the outer guide plate (5).

6. The forced spiral fin coil condensing heat exchanger according to claim 1, characterized in that: a plurality of closely arranged spiral fins form a smoke exhaust duct (15) below the burner (6) An inner guide plate (7) is provided on the inside of the coil tube (8).

7. The forced spiral fin coil condensing heat exchanger according to claim 6, characterized in that: the inner guide plate (7) is a cylinder with multiple holes and/or slits attached thereto. A shaped guide plate is fitted to the inside of the spiral fin coil, and the adjacent points of a plurality of closely arranged spiral fin coils (8) are staggered with the guide openings of the inner guide plate (7).

8. The forced spiral fin coil condensing heat exchanger according to claim 1, characterized in that: An air preheater (11) is provided in the smoke exhaust duct (15); the air preheater (11) passes through the smoke exhaust duct (15) and is connected to the air intake device; the smoke exhaust port (12) ) is a four-way smoke exhaust port, the upper end of which is the smoke exhaust port (12), the lower end of which is the condensed water outlet (16), and the middle part is the air inlet (17) of the air preheater (11).

9. The forced spiral fin coil condensing heat exchanger according to claim 8, characterized in that: the air preheater (11) in the exhaust pipe (15) is one or more rectangular parallelepipeds Or cylindrical air intake duct.

10. The forced spiral fin coil condensation heat exchanger according to claim 1, characterized in that: the burner (6) is located at the lower part of the housing (3), and a spiral is coaxially installed around the burner (6) The fin coil tube bundle (4) and the smoke exhaust duct (15) composed of a casing (3) and a plurality of closely arranged spiral fin coil tubes (8) are provided above the burner (6). ) is exhausted through the smoke exhaust port (12); the water inlet (14) is connected to a plurality of closely arranged spiral fin coils (8) above the burner (6), and a plurality of closely arranged spiral fins above the burner (6) The coil (8) is connected with the spiral fin coil around the burner (6), and the spiral fin coil around the burner (6) is connected with the water outlet (13).