Two-stage heat exchange condensation heat exchanger

Abstract

The invention relates to the technical field of water heaters, in particular to a two-stage heat exchange condensation heat exchanger which comprises a smoke inlet, a water-smoke heat exchange area, a refrigerant-smoke heat exchange area, a smoke outlet and a smoke guide plate. Wherein the flue gas guide plates comprise a first flue gas guide plate, a second flue gas guide plate and a third flue gas guide plate; the first flue gas guide plate is arranged below the water-flue gas heat exchange area, the second flue gas guide plate is arranged between the water-flue gas heat exchange area and the refrigerant-flue gas heat exchange area, and the third flue gas guide plate is arranged above the refrigerant-flue gas heat exchange area; the smoke inlet is formed between the first smoke guide plate and the second smoke guide plate, and the smoke inlet is connected with the water-smoke heat exchange area; compared with the prior art, according to the technical scheme, the utilization rate of smoke waste heat can be increased.

Description

Technical Field

[0001] This application relates to the technical field of water heaters, and in particular to a two-stage heat exchange condensing heat exchanger. Background Art

[0002] In existing gas water heaters, high-temperature flue gas generated by combustion exchanges heat with a heat exchanger to achieve the purpose of heating water; after the high-temperature flue gas passes through the heat exchanger, the temperature of the exhausted flue gas can generally reach above 150°C.

[0003] To improve the overall energy efficiency and economy of gas water heaters; currently, gas water heaters on the market generally adopt a secondary condensation method to recover the waste heat in the flue gas, and the temperature of the flue gas after condensation can be reduced to 60 - 80°C.

[0004] However, despite the adoption of the secondary condensation technology, there is still a lot of latent heat loss in the flue gas; therefore, there is an urgent need to solve the problem of insufficient utilization rate of the waste heat in the flue gas in the existing technology and the inability to fully recover the heat in the flue gas. Summary of the Invention

[0005] This application provides a two-stage heat exchange condensing heat exchanger, which can improve the utilization rate of the waste heat in the flue gas.

[0006] In a first aspect, this application provides a two-stage heat exchange condensing heat exchanger, including: a flue gas inlet, a water-flue gas heat exchange area, a refrigerant-flue gas heat exchange area, a flue gas outlet, and a flue gas deflector; wherein, the flue gas deflector is provided with a first flue gas deflector, a second flue gas deflector, and a third flue gas deflector; the first flue gas deflector is arranged below the water-flue gas heat exchange area, the second flue gas deflector is arranged between the water-flue gas heat exchange area and the refrigerant-flue gas heat exchange area, and the third flue gas deflector is arranged above the refrigerant-flue gas heat exchange area; the flue gas inlet is arranged between the first flue gas deflector and the second flue gas deflector, and the flue gas inlet is connected to the water-flue gas heat exchange area; the flue gas outlet is arranged above the third flue gas deflector.

[0007] In a possible way, a number of water flow heat pipe groups are arranged in the water-flue gas heat exchange area, and each water flow heat pipe group includes a number of water flow heat pipes, wherein the number of water flow heat pipes is distributed in a staggered arrangement manner according to a first preset axial distance.

[0008] In a possible way, a water tank, a water inlet, and a water outlet are further arranged in the water-flue gas heat exchange area; wherein, the water tank is respectively connected to the first water inlet ends of the number of water flow heat pipes, and the water tank is respectively connected to the first water outlet ends of the number of water flow heat pipes; the water inlet is connected to the water tank inlet end of the water tank, and the water outlet is connected to the water tank outlet end of the water tank.

[0009] In a possible manner, the axial directions of the plurality of water heat transfer pipes are perpendicular to the flue gas flow direction in the water-flue gas heat exchange area, and the flue gas flow direction in the water-flue gas heat exchange area is opposite to the water flow direction in the water-flue gas heat exchange area.

[0010] In a possible manner, a plurality of refrigerant heat transfer pipe groups are arranged in the refrigerant-flue gas heat exchange area, and each refrigerant heat transfer pipe group includes a plurality of refrigerant heat transfer pipes. Among them, the plurality of refrigerant heat transfer pipes are distributed in a staggered arrangement manner at a second preset axial distance.

[0011] In a possible manner, a refrigerant tank, a refrigerant inlet, and a refrigerant outlet are further arranged in the refrigerant-flue gas heat exchange area; wherein, the refrigerant tank is respectively connected to the first refrigerant inlet ends of the plurality of refrigerant heat transfer pipes, and the refrigerant tank is respectively connected to the first refrigerant outlet ends of the plurality of refrigerant heat transfer pipes; the refrigerant inlet is connected to the refrigerant tank inlet end of the refrigerant tank, and the refrigerant outlet is connected to the refrigerant tank outlet end of the refrigerant tank.

[0012] In a possible manner, the axial directions of the plurality of refrigerant heat transfer pipes are perpendicular to the flue gas flow direction in the refrigerant-flue gas heat exchange area, and the flue gas flow direction in the refrigerant-flue gas heat exchange area is opposite to the refrigerant flow direction in the refrigerant-flue gas heat exchange area.

[0013] In a possible manner, the flue gas deflector is placed in the two-stage heat exchange and condensation heat exchanger at a preset inclination angle.

[0014] In a possible manner, the structures of the water heat transfer pipe and the refrigerant heat transfer pipe are smooth pipe structures or finned structures, and the materials of the water heat transfer pipe and the refrigerant heat transfer pipe are high-temperature resistant and corrosion-resistant materials.

[0015] In a possible manner, the smoke inlet is connected to an external smoke exhaust fan, and the external smoke exhaust fan is connected to a main heat exchanger.

[0016] The embodiment of the present application provides a two-stage heat exchange and condensation heat exchanger, which has the following advantages compared with the prior art:

[0017] The double-stage heat exchange and condensation heat exchanger includes: a smoke inlet, a water-smoke heat exchange area, a refrigerant-smoke heat exchange area, a smoke outlet, and a smoke deflector; wherein, the smoke deflector is provided with a first smoke deflector, a second smoke deflector, and a third smoke deflector; the first smoke deflector is arranged below the water-smoke heat exchange area, the second smoke deflector is arranged between the water-smoke heat exchange area and the refrigerant-smoke heat exchange area, and the third smoke deflector is arranged above the refrigerant-smoke heat exchange area; the smoke inlet is arranged between the first smoke deflector and the second smoke deflector, and the smoke inlet is connected to the water-smoke heat exchange area; the smoke outlet is arranged above the third smoke deflector; compared with the prior art, the technical solution of the present application realizes multi-stage recovery of the waste heat of the flue gas and improves the utilization rate of the waste heat of the flue gas by setting a double heat exchange mechanism of a water-smoke heat exchange area and a refrigerant-smoke heat exchange area, so that after the high-temperature flue gas enters the double-stage heat exchange and condensation heat exchanger from the smoke inlet, under the action of the smoke deflector, it can flow through the water-smoke heat exchange area and the refrigerant-smoke heat exchange area in sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] One or more embodiments are illustrated by way of example in the accompanying drawings corresponding thereto. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the drawings do not constitute a proportional limitation.

[0021] Figure 1 It is a schematic structural diagram of an embodiment of a double-stage heat exchange and condensation heat exchanger provided by the present application;

[0022] Figure 2 It is a schematic installation diagram of a double-stage condensation heat exchanger and a main heat exchanger provided by an embodiment of the present application;

[0023] Figure 3 It is a three-dimensional schematic diagram of a double-stage condensation heat exchanger provided by an embodiment of the present application;

[0024] Figure 4 It is a three-dimensional schematic diagram of a double-stage condensation heat exchanger with the heat exchanger housing removed provided by an embodiment of the present application;

[0025] Figure 5 It is a schematic diagram of flue gas flow of an embodiment provided by this application.

[0026] Explanation of reference numerals in the drawings: flue gas inlet 1, water-flue gas heat exchange area 2, refrigerant-flue gas heat exchange area 3, flue gas outlet 4, first flue gas deflector 5, second flue gas deflector 6, third flue gas deflector 7, heat exchanger outer casing 8, water tank 9, water inlet 10, water outlet 11, refrigerant tank 12, refrigerant inlet 13, refrigerant outlet 14, refrigerant heat transfer pipe 15, water heat transfer pipe 16, condensate drain port 17, main heat exchanger 18, induced draft fan 19. Specific embodiments

[0027] To make the objectives, technical solutions and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some but not all of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without making creative efforts fall within the scope of protection of this application.

[0028] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure of this application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit this application. In addition, this application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0029] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0030] It should also be understood that the terms used in this specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. As used in this specification of this application and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0031] It should be further understood that the term " / and" as used in this specification of this application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0032] As used in this specification and the appended claims, the term "if" may be construed, depending on the context, as "when", "once", "in response to determining", or "in response to detecting". Similarly, the phrase "if determined" or "if [the described condition or event] is detected" may be construed, depending on the context, to mean "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]".

[0033] Example 1, see Figure 1 , Figure 1 is a schematic structural diagram of an embodiment of a two-stage heat exchange and condensation heat exchanger provided by this application. As Figure 1 shown, the two-stage heat exchange and condensation heat exchanger includes a flue gas inlet 11, a water-flue gas heat exchange area 2, a refrigerant-flue gas heat exchange area 3, a flue gas outlet 4, and a flue gas deflector, specifically as follows:

[0034] The flue gas deflector is provided with a first flue gas deflector 5, a second flue gas deflector 6, and a third flue gas deflector 7.

[0035] The first flue gas deflector 5 is arranged below the water-flue gas heat exchange area 2, the second flue gas deflector 6 is arranged between the water-flue gas heat exchange area 2 and the refrigerant-flue gas heat exchange area 3, and the third flue gas deflector 7 is arranged above the refrigerant-flue gas heat exchange area 3.

[0036] The flue gas inlet 1 is arranged between the first flue gas deflector 5 and the second flue gas deflector 6, and the flue gas inlet 1 is connected to the water-flue gas heat exchange area 2.

[0037] The flue gas outlet 4 is arranged above the third flue gas deflector 7.

[0038] In one embodiment, the two-stage heat exchange and condensation heat exchanger is further provided with a heat exchanger outer casing 8. Among them, the water-flue gas heat exchange area 2, the refrigerant-flue gas heat exchange area 3, and the flue gas deflector are arranged inside the heat exchanger outer casing 8, the flue gas inlet 1 is arranged on the side of the heat exchanger outer casing 8, and the flue gas outlet 4 is arranged on the top of the heat exchanger outer casing 8.

[0039] In one embodiment, the flue gas inlet 1 is an important component of the two-stage heat exchange and condensation heat exchanger, and is used to introduce high-temperature flue gas discharged after primary heat exchange through a heat exchanger into the two-stage heat exchange and condensation heat exchanger.

[0040] Specifically, the flue gas inlet 1 is connected to an external exhaust fan 19, and the external exhaust fan 19 is connected to a main heat exchanger 18; as Figure 2 shown, Figure 2It is a schematic installation diagram of a two-stage condensation heat exchanger and a main heat exchanger 18 provided by this application; based on this connection relationship, the high-temperature flue gas discharged after the first heat exchange by the heat exchanger flows from the main heat exchanger 18 to the two-stage heat exchange condensation heat exchanger through the external exhaust gas fan 19 under the drive of the external exhaust gas fan 19.

[0041] Preferably, the main heat exchanger 18 includes, but is not limited to, the main heat exchanger of a gas water heater or the main heat exchanger of a gas-fired heating water heater.

[0042] Specifically, the setting position of the smoke inlet 1 is crucial. The smoke inlet 1 is arranged between the first smoke deflector 5 and the second smoke deflector 6 and is connected to the water-smoke heat exchange area 2; this design ensures that the high-temperature flue gas can directly enter the water-smoke heat exchange area 2 through the smoke inlet 1 and start the heat exchange process.

[0043] In one embodiment, the water-smoke heat exchange area 2 is the first heat exchange area of the two-stage heat exchange condensation heat exchanger and is used for preliminary heat exchange of the high-temperature flue gas.

[0044] Specifically, a number of water flow heat transfer pipe groups are arranged in the water-smoke heat exchange area 2. Each water flow heat transfer pipe group includes a number of water flow heat transfer pipes 16. Among them, the number of water flow heat transfer pipes 16 is distributed in a staggered arrangement manner according to the first preset axial distance.

[0045] Specifically, the first preset axial distance includes, but is not limited to, 10 - 30 mm.

[0046] Specifically, the number of water flow heat transfer pipes 16 is water flow heat transfer pipes 16 that can pass water and are used for heat exchange with high-temperature flue gas.

[0047] Specifically, the structure of the water flow heat transfer pipe 16 includes, but is not limited to, a series of common heat exchange structures that can improve the heat transfer efficiency, such as a smooth pipe structure or a finned structure, etc. And the material of the water flow heat transfer pipe 16 is a high-temperature resistant and anti-corrosion material, preferably stainless steel material.

[0048] Specifically, the axial direction of the number of water flow heat transfer pipes 16 is perpendicular to the flue gas flow direction in the water-smoke heat exchange area 2, which is convenient for the flue gas to fully contact the pipeline, and is arranged in a staggered manner according to the first preset axial distance. The purpose is to allow the flue gas to pass through smoothly and increase the contact area between the flue gas and the water flow heat transfer pipes 16.

[0049] Specifically, a water tank 9, a water inlet 10, and a water outlet 11 are further arranged in the water-smoke heat exchange area 2; wherein, the water tank 9 is respectively connected to the first water inlet ends of the several water flow heat transfer pipes 16, and the water tank 9 is respectively connected to the first water outlet ends of the several water flow heat transfer pipes 16; the water inlet 10 is connected to the water inlet end of the water tank 9, and the water outlet 11 is connected to the water outlet end of the water tank 9.

[0050] Specifically, the water tank 9 is used to parallelly connect the first water inlet ends and the first water outlet ends of the several water flow heat transfer pipes 16, thereby realizing the series connection between several groups of water flow heat transfer pipes 16, which can effectively increase the heat exchange area, reduce the water flow resistance, and improve the heat exchange efficiency of the water flow; and it is set that the water flow flows into the water tank 9 from the water inlet 10, and then is distributed to the several water flow heat transfer pipes 16 through the water tank 9. After the water flow flows out of the several water flow heat transfer pipes 16, it passes through the water tank 9 again, and finally flows out from the water outlet 11.

[0051] Specifically, the flowing direction of the smoke in the water-smoke heat exchange area 2 is opposite to the flowing direction of the water in the water-smoke heat exchange area 2.

[0052] Specifically, as Figure 3 shown, Figure 3 is a three-dimensional schematic diagram of a two-stage condensation heat exchanger according to an embodiment provided by the present application; as Figure 4 shown, Figure 4 is a three-dimensional schematic diagram of the two-stage condensation heat exchanger with the heat exchanger shell removed according to an embodiment provided by the present application; as Figure 5 shown, Figure 5 is a schematic diagram of the smoke flow of an embodiment provided by the present application; the water outlet 11 is arranged near the smoke inlet 1 in the water-smoke heat exchange area 2, and the water inlet 10 is arranged on the side far from the smoke inlet 1 in the water-smoke heat exchange area 2; based on this, the flowing direction of the water flow from the water inlet 10 into the water-smoke heat exchange area 2 to the water outlet 11 is opposite to the smoke flow direction, that is, the water flow direction is from right to left, and the smoke flow direction is from left to right, which can increase the heat exchange temperature difference and further improve the heat exchange efficiency.

[0053] In one embodiment, the high-temperature smoke after passing through the water-smoke heat exchange area 2 can be reduced from 150 °C to medium-low temperature smoke of 60 - 80 °C. At this time, the medium-low temperature smoke still has a large amount of heat, but since the temperature difference between the smoke temperature and the water temperature of the medium-low temperature smoke is already small at this time and it is impossible to continue heat exchange with water, therefore, in the embodiment of the present application, a refrigerant-smoke heat exchange area 3 is further arranged. The smoke that has completed one heat exchange in the water-smoke heat exchange area 2 will continue to flow, and then flow from the water-smoke heat exchange area 2 to the refrigerant-smoke heat exchange area 3.

[0054] In one embodiment, the refrigerant-flue gas heat exchange area 3 is the second heat exchange area of the double-stage heat exchange and condensation heat exchanger, and is used for further heat exchange of the medium- and low-temperature flue gas after preliminary heat exchange.

[0055] Specifically, a number of refrigerant heat transfer tube groups are arranged in the refrigerant-flue gas heat exchange area 3. Each refrigerant heat transfer tube group includes a number of refrigerant heat transfer tubes 15. Among them, the number of refrigerant heat transfer tubes 15 is distributed in a staggered arrangement manner according to a second preset axial distance.

[0056] Specifically, the second preset axial distance includes, but is not limited to, 10-30 mm.

[0057] Specifically, a refrigerant with a lower temperature is placed in the number of refrigerant heat transfer tubes 15 for heat exchange with the medium- and low-temperature flue gas after preliminary heat exchange.

[0058] Specifically, the structure of the refrigerant heat transfer tube 15 includes, but is not limited to, a series of common heat exchange structures that can improve the heat transfer efficiency, such as a smooth tube structure or a finned tube structure, etc. And the material of the refrigerant heat transfer tube 15 is a high-temperature resistant and corrosion-resistant material, preferably stainless steel.

[0059] Specifically, the axial direction of the number of refrigerant heat transfer tubes 15 is perpendicular to the flue gas flow direction in the refrigerant-flue gas heat exchange area 3, which is convenient for the flue gas to fully contact the pipeline, and is arranged in a staggered manner according to the second preset axial distance. The purpose is to allow the flue gas to pass through smoothly and increase the contact area between the flue gas and the refrigerant heat transfer tube 15.

[0060] Specifically, a refrigerant tank 12, a refrigerant inlet 13 and a refrigerant outlet 14 are also arranged in the refrigerant-flue gas heat exchange area 3; among them, the refrigerant tank 12 is respectively connected to the first refrigerant inlet ends of the number of refrigerant heat transfer tubes 15, and the refrigerant tank 12 is respectively connected to the first refrigerant outlet ends of the number of refrigerant heat transfer tubes 15; the refrigerant inlet 13 is connected to the refrigerant inlet end of the refrigerant tank 12 of the refrigerant tank 12, and the refrigerant outlet 14 is connected to the refrigerant outlet end of the refrigerant tank 12 of the refrigerant tank 12.

[0061] Specifically, the refrigerant tank 12 is used to connect the first refrigerant inlet ends and the first refrigerant outlet ends of the number of refrigerant heat transfer tubes 15 in parallel, so as to realize the series connection between several refrigerant heat transfer tube groups, which can effectively increase the heat exchange area, reduce the refrigerant flow resistance, and improve the heat exchange efficiency of the refrigerant; and it is set that the refrigerant flows into the refrigerant tank 12 from the refrigerant inlet 13, and then is distributed to the number of refrigerant heat transfer tubes 15 through the refrigerant tank 12. After the refrigerant flows out of the number of refrigerant heat transfer tubes 15, it passes through the refrigerant tank 12 again, and finally flows out from the refrigerant outlet 14.

[0062] Specifically, the flue gas flow direction in the refrigerant - flue gas heat exchange area 3 is opposite to the refrigerant flow direction in the refrigerant - flue gas heat exchange area 3.

[0063] Specifically, as Figure 3 and Figure 4 shown, the refrigerant outlet 14 is arranged on the side where the water inlet 10 is located in the refrigerant water - flue gas heat exchange area 2, and the refrigerant inlet 13 is arranged on the side where the water outlet 11 is located in the refrigerant - flue gas heat exchange area 3; based on this, the refrigerant flow direction in the refrigerant - flue gas heat exchange area 3 from the refrigerant flowing in from the refrigerant inlet 13 to flowing out from the refrigerant outlet 14 is opposite to the flue gas flow direction, that is, the refrigerant flow direction is from left to right, and the flue gas flow direction is from right to left, which can increase the heat exchange temperature difference and further improve the heat exchange efficiency.

[0064] Specifically, after absorbing heat, the refrigerant may undergo a phase change, changing from a liquid state to a gaseous state, and this process further improves the heat exchange efficiency; the heat - absorbed refrigerant is then compressed by a compressor through a heat pump system. The function of the compressor is to increase the pressure and temperature of the refrigerant, changing it from a low - temperature and low - pressure gaseous state to a high - temperature and high - pressure gaseous state. The high - temperature and high - pressure refrigerant enters the condenser and exchanges heat with water in the condenser; the refrigerant transfers heat to the water, its own temperature decreases and it changes back to a liquid state again, and the heat released by the refrigerant is absorbed by the water, thereby increasing the temperature of the water; this process realizes the secondary transfer of heat from the flue gas to the water and improves the overall thermal efficiency of the system; (no schematic diagram is given); at this time, the flue gas temperature can be reduced to below 20°C, the heat in the flue gas can be fully utilized, and even the flue gas discharge temperature can be lower than the air environment temperature, greatly improving the heat exchange efficiency of the system.

[0065] In one embodiment, the flue gas deflector is an important part of the double - stage heat - exchange and condensation heat exchanger and is used to guide the flow direction of the flue gas.

[0066] Specifically, the first flue gas deflector 5 is arranged below the water - flue gas heat exchange area 2 to ensure that the high - temperature flue gas can smoothly enter the water - flue gas heat exchange area 2; the second flue gas deflector 6 is arranged between the water - flue gas heat exchange area 2 and the refrigerant - flue gas heat exchange area 3 to guide the medium - low - temperature flue gas that has undergone primary heat exchange in the water - flue gas heat exchange area 2 into the refrigerant - flue gas heat exchange area 3; the third flue gas deflector 7 is arranged above the refrigerant - flue gas heat exchange area 3 to ensure that the low - temperature flue gas can smoothly discharge from the heat exchanger.

[0067] Specifically, the flue gas deflector is placed in the double - stage heat - exchange and condensation heat exchanger at a preset inclination angle, ensuring that the flue gas can flow through the water - flue gas heat exchange area 2 and the refrigerant - flue gas heat exchange area 3 in sequence along a predetermined path, optimizing the flue gas flow path and reducing heat loss.

[0068] Specifically, the two heat exchange zones described above are separated by a baffle with an inclined angle, aiming to guide the flow direction of the flue gas, so that the flue gas first flows through the water heat exchange zone and then through the refrigerant heat exchange zone. This can not only achieve a good heat exchange effect, but also protect the refrigerant system from overheating and prevent the refrigerant pressure from being too high. At the same time, the inclined baffle can enable the condensate to drain smoothly.

[0069] In one embodiment, the smoke outlet 4 is located at the top of the double-stage heat exchange and condensation heat exchanger, specifically above the third flue gas deflector 7; the smoke outlet 4 is used to discharge the low-temperature flue gas after two heat exchanges; this design ensures that the flue gas can be discharged from the heat exchanger smoothly after passing through the water-flue gas heat exchange zone 2 and the refrigerant-flue gas heat exchange zone 3.

[0070] Preferably, the smoke outlet 4 is connected to an external smoke exhaust system through a pipeline to ensure that the low-temperature flue gas can be discharged from the heat exchanger smoothly.

[0071] In one embodiment, the double-stage heat exchange and condensation heat exchanger provided in the present application is also provided with a condensate drain outlet 17.

[0072] Specifically, in the water-flue gas heat exchange zone 2, the high-temperature flue gas exchanges heat with the cold water in the water heat transfer pipe 16. Since the flue gas contains a large amount of water vapor, when the flue gas temperature decreases, the water vapor will condense into liquid water. These condensates will adhere to the outer wall of the water heat transfer pipe 16 and flow down along the pipe wall; in the refrigerant-flue gas heat exchange zone 3, the medium-low temperature flue gas exchanges heat with the refrigerant in the refrigerant heat transfer pipe 15. Similarly, due to the further decrease of the flue gas temperature, the water vapor in the flue gas will continue to condense into liquid water. These condensates will also adhere to the outer wall of the refrigerant heat transfer pipe 15 and flow down along the pipe wall.

[0073] Specifically, the condensate drain outlet 17 is arranged at the bottom of the double-stage heat exchange and condensation heat exchanger, and the position of the condensate drain outlet 17 is below the water-flue gas heat exchange zone 2 to ensure that the condensate can be discharged smoothly.

[0074] Specifically, the main function of the condensate drain outlet 17 is to discharge these condensates from the heat exchanger; if the condensates are not discharged in time, they will accumulate in the heat exchanger, which may affect the heat exchange efficiency and even cause corrosion and damage inside the heat exchanger; the design of the condensate drain outlet 17 can effectively prevent the accumulation of condensates in the heat exchanger. By reasonably setting the position and structure of the drain outlet, it can ensure that the condensates can be discharged smoothly and avoid the accumulation and retention of condensates in the heat exchanger.

[0075] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, provided that these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

[0076] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A two-stage heat exchange and condensation heat exchanger, characterized in that, Comprising: A smoke inlet, a water-smoke heat exchange area, a refrigerant-smoke heat exchange area, a smoke outlet, and a smoke deflector; Among them, the smoke deflector is provided with a first smoke deflector, a second smoke deflector, and a third smoke deflector; The first smoke deflector is arranged below the water-smoke heat exchange area, the second smoke deflector is arranged between the water-smoke heat exchange area and the refrigerant-smoke heat exchange area, and the third smoke deflector is arranged above the refrigerant-smoke heat exchange area; The smoke inlet is arranged between the first smoke deflector and the second smoke deflector, and the smoke inlet is connected to the water-smoke heat exchange area; The smoke outlet is arranged above the third smoke deflector.

2. A two-stage heat exchange and condensation heat exchanger as described in claim 1 above, characterized in that, A number of water flow heat transfer pipe groups are arranged in the water-smoke heat exchange area. Each water flow heat transfer pipe group includes a number of water flow heat transfer pipes. Among them, the number of water flow heat transfer pipes is distributed in a staggered arrangement manner according to a first preset axial distance.

3. A two-stage heat exchange and condensation heat exchanger according to claim 2 above, characterized in that, A water tank, a water inlet, and a water outlet are also arranged in the water-smoke heat exchange area; Among them, the water tank is respectively connected to the first water inlet ends of the number of water flow heat transfer pipes, and the water tank is respectively connected to the first water outlet ends of the number of water flow heat transfer pipes; The water inlet is connected to the water tank inlet end of the water tank, and the water outlet is connected to the water tank outlet end of the water tank.

4. A two-stage heat exchange and condensation heat exchanger as described in claim 2 above, characterized in that, The axial direction of the number of water flow heat transfer pipes is perpendicular to the smoke flow direction in the water-smoke heat exchange area, and the smoke flow direction in the water-smoke heat exchange area and the water flow direction in the water-smoke heat exchange area are in opposite directions.

5. A two-stage heat exchange and condensation heat exchanger according to claim 2 above, characterized in that, A number of refrigerant heat transfer pipe groups are arranged in the refrigerant-smoke heat exchange area. Each refrigerant heat transfer pipe group includes a number of refrigerant heat transfer pipes. Among them, the number of refrigerant heat transfer pipes is distributed in a staggered arrangement manner according to a second preset axial distance.

6. A two-stage heat exchange and condensation heat exchanger according to claim 5 above, characterized in that, A refrigerant tank, a refrigerant inlet, and a refrigerant outlet are also arranged in the refrigerant-smoke heat exchange area; Among them, the refrigerant tank is respectively connected to the first refrigerant inlet ends of the number of refrigerant heat transfer pipes, and the refrigerant tank is respectively connected to the first refrigerant outlet ends of the number of refrigerant heat transfer pipes; The refrigerant inlet is connected to the refrigerant tank inlet end of the refrigerant tank, and the refrigerant outlet is connected to the refrigerant tank outlet end of the refrigerant tank.

7. A two-stage heat exchange and condensation heat exchanger as described in claim 5 above, characterized in that, The axial direction of the number of refrigerant heat transfer pipes is perpendicular to the smoke flow direction in the refrigerant-smoke heat exchange area, and the smoke flow direction in the refrigerant-smoke heat exchange area and the refrigerant flow direction in the refrigerant-smoke heat exchange area are in opposite directions.

8. A two-stage heat exchange and condensation heat exchanger as described in claim 1 above, characterized in that, The smoke deflector is placed in the double-stage heat exchange and condensation heat exchanger at a preset inclination angle.

9. A two-stage heat exchange and condensation heat exchanger as described in claim 5 above, characterized in that, The structures of the water flow heat transfer pipes and the refrigerant heat transfer pipes are smooth tube structures or finned tube structures, and the materials of the water flow heat transfer pipes and the refrigerant heat transfer pipes are high-temperature resistant and corrosion-resistant materials.

10. A two-stage heat exchange and condensation heat exchanger as described in claim 1 above, characterized in that, The smoke inlet is connected to an external smoke exhaust fan, and the external smoke exhaust fan is connected to a main heat exchanger.

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