Gas heating water heater waste heat recovery device and gas heating water heater

Abstract

The utility model relates to hot water stove technical field discloses a kind of gas heating hot water stove waste heat recovery device and gas heating hot water stove, and gas heating hot water stove waste heat recovery device includes shell, heating water cavity and flue gas cavity are equipped in shell, shell is equipped with the heating water inlet and heating water outlet respectively with heating water cavity intercommunication, shell is equipped with the flue gas inlet and flue gas outlet respectively with flue gas cavity intercommunication;It further includes heat pipe heat exchanger, heat pipe heat exchanger is located in shell, and heating water cavity and flue gas cavity are formed not intercommunication heat pipe heat exchanger, and heat pipe heat exchanger includes multiple heat pipes, each heat pipe includes condensation section and evaporation section, condensation section is located in heating water cavity, evaporation section is located in flue gas cavity, and heat pipe is equipped with heat exchange medium. By setting heat pipe heat exchanger in shell, heat pipe heat exchanger can be absorbed to flue gas heat by phase change of heat exchange medium in it, and heat exchange efficiency is higher, simultaneously, the volume of gas heating hot water stove waste heat recovery device can be made smaller.

Description

Technical Field

[0001] This utility model relates to the field of hot water boiler technology, and in particular to a waste heat recovery device for a gas-fired heating hot water boiler and a gas-fired heating hot water boiler. Background Technology

[0002] Currently, the condensing heat exchangers used in two-stage condensing heat exchange gas-fired heating and hot water boilers on the market are generally coil-type heat exchangers. Their working principle is as follows: the heating return water flows inside the coil, and the flue gas flows outside the coil. The coil is heated by the heat in the flue gas, thereby achieving the function of preheating the heating return water inside the coil.

[0003] However, when a gas-fired heating and hot water boiler is burning under low load, its flue gas temperature is relatively low. At this time, the heat absorption effect of the coil-type two-stage condensing heat exchanger will be significantly reduced, and the heat exchange efficiency will be low. If a higher heat exchange efficiency is to be achieved, the length of the coil is often required to increase the heat exchange area, which will make the heat exchanger larger in size, which is not conducive to the miniaturization of gas-fired heating and hot water boilers. Utility Model Content

[0004] The first technical problem solved by this utility model is to provide a waste heat recovery device for gas-fired heating and hot water boilers, which can effectively improve the heat exchange efficiency of condensing heat exchangers while meeting the miniaturization requirements of gas-fired heating and hot water boilers.

[0005] The second technical problem solved by this utility model is to provide a gas-fired heating and hot water boiler that can effectively improve the heat exchange efficiency of the condensing heat exchanger while meeting the miniaturization requirements of the gas-fired heating and hot water boiler.

[0006] The first technical problem mentioned above is solved by the following technical solution: A waste heat recovery device for a gas-fired heating and hot water boiler includes a shell, wherein a heating water chamber and a flue gas chamber are provided inside the shell, the shell is provided with a heating water inlet and a heating water outlet respectively communicating with the heating water chamber, and the shell is provided with a flue gas inlet and a flue gas outlet respectively communicating with the flue gas chamber. It also includes a heat pipe heat exchanger, which is located inside the shell and forms a heating water cavity and a flue gas cavity that are not interconnected; the heat pipe heat exchanger includes multiple heat pipes, each heat pipe including a condensing section and an evaporating section, the condensing section being located inside the heating water cavity, the evaporating section being located inside the flue gas cavity, and a heat exchange medium being provided inside the heat pipe. Compared with the prior art, the waste heat recovery device for gas-fired heating and hot water boilers described in this utility model has the following advantages: A heating water cavity and a flue gas cavity are set inside the shell. The condensing section of the heat pipe heat exchanger is located in the heating water cavity, and the evaporating section is located in the flue gas cavity. The heat exchange medium in the heat pipe absorbs heat from the flue gas and evaporates in the evaporating section. The steam flows rapidly to the condensing section of the heat pipe under a small pressure difference. The steam condenses in the condensing section, releasing a large amount of latent heat of vaporization which is absorbed by the heating water. The condensed liquid then flows back to the evaporating section along the pipe wall by capillary force. This cycle continues continuously and efficiently. Therefore, by setting a heat pipe heat exchanger inside the shell, and considering the advantages of low thermal resistance and strong heat transfer capacity of heat pipes, the heat pipe heat exchanger can absorb heat from the flue gas through the phase change of the heat exchange medium inside, resulting in high heat exchange efficiency. Even if the flue gas temperature is low, the heat exchange medium can fully absorb the heat from the flue gas and concentrate the heat to better heat the heating return water, achieving high-efficiency heat exchange even during low-load combustion. Compared with existing coil-type condensing heat exchangers, heat pipe heat exchangers have stronger heat transfer capacity and higher heat exchange efficiency. While achieving the same heat exchange capacity as coil-type condensing heat exchangers, the heat exchange area of ​​heat pipe heat exchangers can be made smaller. Therefore, the overall structure of the waste heat recovery device for gas-fired heating and hot water boilers is more compact, and the size of the waste heat recovery device for gas-fired heating and hot water boilers can be made smaller, thus meeting the requirements of improving heat exchange efficiency and miniaturization.

[0007] In one embodiment, the housing is provided with a partition plate that divides the housing into a heating water chamber and a flue gas chamber. The partition plate is provided with mounting holes, through which the heat pipe heat exchanger passes and is fixedly connected to the partition plate. The condensing section and the evaporating section are located on opposite sides of the partition plate.

[0008] In one embodiment, the heat pipe heat exchanger includes a fixed plate, the condensing section and the evaporating section are respectively fixedly connected to both sides of the fixed plate, and the fixed plate is sealed and fixedly connected to the partition plate.

[0009] In one embodiment, a sealing element is provided between the fixing plate and the partition plate; And / or, the fixing plate is screwed to the partition plate.

[0010] In one embodiment, the heat pipe heat exchanger includes heat exchange fins disposed on the outer wall of the evaporation section.

[0011] In one embodiment, the housing includes a first housing and a second housing that are detachably and sealed together. The first housing has the heating water inlet and the heating water outlet, and the second housing has the flue gas inlet and the flue gas outlet.

[0012] In one embodiment, the heating water inlet is located on the upper side of the first housing, and the heating water outlet is located on the lower side of the first housing; And / or, the flue gas inlet is located on the right side of the second housing, and the flue gas outlet is located on the upper side of the second housing.

[0013] In one embodiment, the bottom of the second housing is provided with a condensate drain outlet.

[0014] In one embodiment, the heat pipe is a copper-steel composite heat pipe, the inner wall of the heat pipe is a copper wall, and the outer wall of the heat pipe is a stainless steel wall.

[0015] The second technical problem mentioned above is solved by the following technical solution: A gas-fired heating and hot water boiler includes the aforementioned waste heat recovery device, a cold water inlet pipe, and a hot water outlet pipe. The heating water inlet is connected to the cold water inlet pipe, and the heating water outlet is connected to the hot water outlet pipe.

[0016] Compared with the prior art, the gas-fired heating water heater of this utility model has the following advantages: By setting the above-mentioned waste heat recovery device in the gas-fired heating water heater, a heating water cavity and a flue gas cavity are set in the shell. The condensing section of the heat pipe heat exchanger is located in the heating water cavity, and the evaporating section is located in the flue gas cavity. The heat exchange medium in the heat pipe will absorb the heat of the flue gas and evaporate in the evaporating section. The steam will flow rapidly to the condensing section of the heat pipe under a small pressure difference. The steam condenses in the condensing section, releasing a large amount of vaporization potential. Heat is absorbed by the heating water, and the condensed liquid flows back to the evaporation section along the pipe wall by capillary force, thus continuously and efficiently circulating. Therefore, by installing a heat pipe heat exchanger inside the shell, the heat pipe, with its advantages of low thermal resistance and strong heat transfer capacity, can absorb heat from the flue gas through the phase change of the heat exchange medium within it, resulting in high heat exchange efficiency. Even at low flue gas temperatures, the heat exchange medium can fully absorb the heat from the flue gas and concentrate it to better heat the heating return water, achieving high-efficiency heat exchange even during low-load combustion. Compared to existing coil-type condensing heat exchangers, the heat pipe heat exchanger, due to its strong heat transfer capacity and high heat exchange efficiency, achieves the same heat exchange capacity as the coil-type condensing heat exchanger while having a smaller heat exchange area. This allows for a more compact overall structure and smaller size of the waste heat recovery device for gas-fired heating and hot water boilers, simultaneously meeting the requirements for improved heat exchange efficiency and miniaturization. Attached Figure Description To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a waste heat recovery device for a gas-fired heating hot water boiler according to an embodiment of the present utility model; Figure 2 This is a cross-sectional view of a waste heat recovery device for a gas-fired heating and hot water boiler. Figure 3 Exploded view of a waste heat recovery device for a gas-fired heating hot water boiler; Figure 4 This is a schematic diagram of the first shell structure; Figure 5 This is a schematic diagram of the second shell structure; Figure 6 This is a schematic diagram of a heat pipe heat exchanger. Figure 7 This is a schematic diagram of a heat pipe structure; Figure 8 This is a partial structural diagram of a gas-fired heating and hot water boiler.

[0018] Explanation of reference numerals in the attached figures: 1. Shell; 101. First shell; 1011. Heating water inlet; 1012. Heating water outlet; 1013. Third screw hole; 102. Second shell; 1021. Flue gas inlet; 1022. Flue gas outlet; 1023. Partition plate; 10231. Mounting hole; 10232. First screw hole; 1024. Condensate drain outlet; 1025. Fourth screw hole; 103. Heating water chamber; 104. Flue gas chamber; 2. Heat pipe heat exchanger; 201. Heat pipe; 2011. Evaporation section; 2012. Condensation section; 2013. Heat exchange fins; 202. Fixing plate; 2021. Second screw hole; 3. Screw; 4. Seal; 5. Heating cold water inlet pipe; 6. Heating hot water outlet pipe; 7. Main heat exchanger; 8. Fan. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In the description of this application, it should be understood that the terms "center", "upper", "lower", "left", "right", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] The terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this application, unless otherwise stated, “a plurality” means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0024] According to an embodiment of the present invention, in one aspect, a waste heat recovery device for a gas-fired heating hot water boiler is provided, including a housing 1, a heating water chamber 103 and a flue gas chamber 104 are provided inside the housing 1, the housing 1 is provided with a heating water inlet 1011 and a heating water outlet 1012 respectively communicating with the heating water chamber 103, and the housing 1 is provided with a flue gas inlet 1021 and a flue gas outlet 1022 respectively communicating with the flue gas chamber 104. It also includes a heat pipe heat exchanger 2, which is located inside the shell 1 and forms a heating water cavity 103 and a flue gas cavity 104 that are not connected to each other. The heat pipe heat exchanger 2 includes multiple heat pipes 201, each heat pipe 201 including a condensing section 2012 and an evaporating section 2011. The condensing section 2012 is located inside the heating water cavity 103, and the evaporating section 2011 is located inside the flue gas cavity 104. The heat pipe 201 contains a heat exchange medium. Compared with the prior art, the waste heat recovery device for gas-fired heating and hot water boiler of this utility model has the following advantages: A heating water chamber 103 and a flue gas chamber 104 are provided inside the shell 1. The condensing section 2012 of the heat pipe heat exchanger 2 is located inside the heating water chamber 103, and the evaporating section 2011 is located inside the flue gas chamber 104. The heat exchange medium in the heat pipe 201 absorbs heat from the flue gas and evaporates in the evaporating section 2011. The steam flows rapidly to the condensing section 2012 of the heat pipe 201 under a small pressure difference. The steam condenses in the condensing section 2012, releasing a large amount of vapor during the process. The latent heat of combustion is absorbed by the heating water, and the condensed liquid flows back to the evaporation section 2011 along the pipe wall by capillary force, thus continuously and efficiently circulating. Therefore, by installing a heat pipe heat exchanger 2 inside the shell 1, the heat pipe 201 has the advantages of low thermal resistance and strong heat transfer capacity. The heat pipe heat exchanger 2 can absorb heat from the flue gas through the phase change of the heat exchange medium inside, resulting in high heat exchange efficiency. Even if the flue gas temperature is low, the heat exchange medium can fully absorb the heat from the flue gas and concentrate the heat to better heat the heating return water, achieving high-efficiency heat exchange even during low-load combustion. Compared with existing coil-type condensing heat exchangers, the heat pipe heat exchanger 2 has a higher heat exchange efficiency, achieving the same heat exchange capacity as the coil-type condensing heat exchanger, while the heat exchange area of ​​the heat pipe heat exchanger 2 can be made smaller. Therefore, the overall structure of the waste heat recovery device for gas-fired heating and hot water boilers is more compact, and the volume of the waste heat recovery device for gas-fired heating and hot water boilers can be made smaller, thus meeting the requirements of improving heat exchange efficiency and miniaturization.

[0025] like Figure 2 As shown, the housing 1 is provided with a partition plate 1023, which divides the housing 1 into a heating water chamber 103 and a flue gas chamber 104, as follows. Figure 5 As shown, the partition plate 1023 is provided with mounting holes 10231. The heat pipe heat exchanger 2 passes through the mounting holes 10231 and is fixedly connected to the partition plate 1023. The condensing section 2012 and the evaporating section 2011 are located on both sides of the partition plate 1023, respectively.

[0026] By providing a partition plate 1023 inside the shell 1, the internal space of the shell 1 can be easily divided into a heating water chamber 103 and a flue gas chamber 104. By providing mounting holes 10231 on the partition plate 1023, it is easy to fix and connect the heat pipe heat exchanger 2. The condensing section 2012 and the evaporating section 2011 of the heat pipe heat exchanger 2 are respectively located in the corresponding heating water chamber 103 and flue gas chamber 104, resulting in a relatively compact and simple structure.

[0027] Of course, in other embodiments, the partition plate 1023 may not be provided, but other fixing structures may be provided in the housing 1 to fix the heat pipe heat exchanger 2 in the housing 1.

[0028] To facilitate the fixed connection of the heat pipe heat exchanger 2 and the partition plate 1023, such as Figure 2 and Figure 6 As shown, the heat pipe heat exchanger 2 includes a fixed plate 202, a condensing section 2012 and an evaporating section 2011 respectively fixedly connected to both sides of the fixed plate 202, and the fixed plate 202 is sealed and fixedly connected to the partition plate 1023.

[0029] A sealing element 4 is provided between the fixing plate 202 and the partition plate 1023. Specifically, the sealing element 4 is a rubber sealing gasket. As an alternative embodiment, the sealing element 4 may also be a silicone sealing gasket.

[0030] like Figure 5 As shown, the partition plate 1023 is provided with a plurality of first screw holes 10232, such as Figure 6 As shown, the fixing plate 202 is provided with a plurality of second screw holes 2021, and the first screw holes 10232 and the second screw holes 2021 are arranged in a one-to-one correspondence. The fixing plate 202 and the partition plate 1023 are fixedly connected by screws 3. As an alternative implementation, the fixing plate 202 and the partition plate 1023 can also be connected by other fixing methods, such as snap-fit, and no further restrictions are imposed here.

[0031] like Figure 6 and Figure 7 As shown, the heat pipe heat exchanger 2 includes heat exchange fins 2013, which are disposed on the outer side of the evaporation section 2011. By providing heat exchange fins 2013 on the outer side of the evaporation section 2011, heat exchange can be enhanced. As an alternative implementation, heat exchange fins 2013 may be provided on the outer walls of both the evaporation section 2011 and the condensation section 2012, or heat exchange fins 2013 may be provided only on the outer wall of the condensation section 2012.

[0032] For ease of assembly, the housing 1 includes a detachably sealed first housing 101 and a second housing 102. The first housing 101 is provided with a heating water inlet 1011 and a heating water outlet 1012, and the second housing 102 is provided with a flue gas inlet 1021 and a flue gas outlet 1022. Figures 1 to 5 As shown.

[0033] like Figure 5 As shown, the partition plate 1023 is disposed inside the second housing 102.

[0034] A heating water cavity 103 is formed between the first housing 101, the partition plate 1023, and a portion of the second housing 102; a flue gas cavity 104 is formed between the partition plate 1023 and another portion of the second housing 102. (See details...) Figure 2 .

[0035] like Figure 3As shown, a sealing element 4, which can be a rubber gasket, is provided between the first housing 101 and the second housing 102. Alternatively, the sealing element 4 between the first housing 101 and the second housing 102 can be configured in other forms.

[0036] like Figure 4 and Figure 5 As shown, the first housing 101 has a plurality of third screw holes 1013, and the second housing 102 has a plurality of fourth screw holes 1025. The third screw holes 1013 and the fourth screw holes 1025 are arranged in a one-to-one correspondence. The first housing 101 and the second housing 102 are fixedly connected by screws 3. As an alternative implementation, the first housing 101 and the second housing 102 can also be detachably connected by other means, such as snap-fit, without much limitation here.

[0037] In one embodiment, the heating water inlet 1011 is located on the upper side of the first housing 101, and the heating water outlet 1012 is located on the lower side of the first housing 101, specifically as follows: Figure 4 As shown, the heating water inlet 1011 and the heating water outlet 1012 are arranged diagonally on the first housing 101. As an alternative implementation, the heating water inlet 1011 and the heating water outlet 1012 may be located in other positions on the first housing 101, without much limitation.

[0038] In one embodiment, the flue gas inlet 1021 is located on the right side of the second housing 102, and the flue gas outlet 1022 is located on the upper side of the second housing 102, such as... Figure 5 As shown. As an alternative implementation, the flue gas inlet 1021 and the flue gas outlet 1022 can also be arranged opposite each other, and the specific arrangement can be adjusted according to actual needs.

[0039] like Figure 5 As shown, the bottom of the second housing 102 is provided with a condensate drain outlet 1024. Specifically, the condensate drain outlet 1024 is located at the bottom of the flue gas cavity 104. Since the heat in the flue gas is absorbed by the evaporation section 2011 of the heat pipe heat exchanger 2, condensate will be generated on the surface of the evaporation section 2011. By providing a condensate drain outlet 1024 at the bottom of the second housing 102, the condensate can be discharged by gravity.

[0040] In one embodiment, the heat pipe 201 is a copper-steel composite heat pipe, with the inner wall of the heat pipe 201 being made of copper and the outer wall being made of stainless steel. This configuration enables the heat pipe 201 to achieve high-efficiency heat exchange performance while improving the corrosion resistance of the exterior of the heat pipe 201.

[0041] It should be noted that there are no major restrictions on the specific form of the heat pipe heat exchanger 2. When the first shell 101 and the second shell 102 are arranged vertically, and the evaporation section 2011 and the condensation section 2012 of the heat pipe heat exchanger 2 are arranged vertically, the heat pipe heat exchanger 2 can be any form of heat pipe heat exchanger, such as a gravity heat pipe heat exchanger. When the first shell 101 and the second shell 102 are arranged horizontally, and the evaporation section 2011 and the condensation section 2012 of the heat pipe heat exchanger 2 are arranged horizontally, the heat pipe heat exchanger 2 can be any form of heat pipe heat exchanger other than a gravity heat pipe heat exchanger.

[0042] In one embodiment, the heating water chamber 103 directly contains heating water, and the flue gas chamber 104 directly contains flue gas. Alternatively, a heating water pipe may be installed inside the heating water chamber 103, with one end connected to the heating water inlet 1011 and the other end connected to the heating water outlet 1012, and heating water is contained within the pipe. Alternatively, a flue gas pipe may be installed inside the flue gas chamber 104, with one end connected to the flue gas inlet 1021 and the other end connected to the flue gas outlet 1022. During assembly, the first housing 101 and the second housing 102 are in a separate state. A rubber sealing gasket can be first installed on the partition plate 1023, with a through hole corresponding to the mounting hole 10231. Then, the heat pipe heat exchanger 2 is placed into the second housing 102, passing through the mounting hole 10231 on the partition plate 1023 and the through hole on the rubber sealing gasket. After the heat pipe heat exchanger 2 is installed, the partition plate 1023 and the fixing plate 202 are sealed and fixed with screws 3. The screws 3 will not penetrate the partition plate 1023, and because there is a rubber sealing gasket between the partition plate 1023 and the fixing plate 202, the sealing performance of the heating water cavity 103 can be guaranteed. Then, the first housing 101 and the second housing 102 are sealed and fixed with screws 3. Again, a rubber sealing gasket exists between the first housing 101 and the second housing 102, further ensuring the sealing performance of the heating water cavity 103.

[0043] The heat exchange working principle of heat pipe heat exchanger 2 is as follows: Heat pipe 201 contains a suitable amount of heat exchange medium. When heated in the evaporation section 2011 of heat pipe 201, the heat exchange medium evaporates and vaporizes, absorbing a large amount of latent heat of vaporization. The vapor flows rapidly to the condensation section 2012 of heat pipe 201 under a small pressure difference. The vapor condenses on the inner wall of the condensation section 2012, releasing a large amount of latent heat of vaporization. The condensed liquid then flows back to the evaporation section 2011 of heat pipe 201 along the pipe wall by capillary force. This high-speed circulation continues, transferring heat from the evaporation section 2011 to the condensation section 2012 of heat pipe 201. The heat exchange fins 2013 in heat pipe heat exchanger 2 enhance heat exchange.

[0044] According to an embodiment of the present invention, another aspect is provided: a gas-fired heating and hot water boiler, including the above-mentioned waste heat recovery device for the gas-fired heating and hot water boiler, a heating cold water inlet pipe 5 and a heating hot water outlet pipe 6, wherein the heating water inlet 1011 is connected to the heating cold water inlet pipe 5 and the heating water outlet 1012 is connected to the heating hot water outlet pipe 6.

[0045] like Figure 8 As shown, the waste heat recovery device of the gas-fired heating and hot water boiler is installed on the whole unit of the gas-fired heating and hot water boiler. The heating water flows through the heating cold water inlet pipe 5 into the heating water chamber 103 of the waste heat recovery device of the gas-fired heating and hot water boiler, absorbs the high temperature heat of the flue gas, and then flows through the heating hot water outlet pipe 6 to the main heat exchanger 7 of the combustion chamber of the gas-fired heating and hot water boiler, and further absorbs the high temperature heat of the gas combustion.

[0046] When the gas-fired heating and hot water boiler is in operation, the high-temperature flue gas generated after combustion is drawn away by the fan 8 and flows into the flue gas inlet 1021 of the waste heat recovery device. It then enters the flue gas chamber 104 within the waste heat recovery device, where it is heated by the heat pipe heat exchanger 2 before being discharged outdoors through the flue gas outlet 1022. Specifically, the flue gas chamber 104 contains an evaporation section 2011 with multiple rows of heat pipes 201. The heat exchange medium in the evaporation section 2011 absorbs the heat from the high-temperature flue gas, turning into steam and quickly flowing to the condensation section 2012 of the heat pipes 201. Meanwhile, the heating return water in the heating water chamber 103 enters through the heating water inlet 1011, passes through the condensation sections 2012 of the rows of high-temperature heat pipes 201, fully absorbs the high-temperature heat from the condensation sections 2012, and then flows out through the heating water outlet 1012. At this point, the heat exchange medium in the condensation section 2012 has condensed into a liquid and flows back to the evaporation section 2011 of the heat pipe 201 under the capillary force of the pipe wall. This cycle continues, and the heat from the high-temperature flue gas directly heats the heating return water through the heat pipe heat exchanger 2.

[0047] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0048] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A waste heat recovery device for a gas-fired heating hot water boiler, characterized in that: The device includes a housing (1), which contains a heating water chamber (103) and a flue gas chamber (104). The housing (1) has a heating water inlet (1011) and a heating water outlet (1012) that are respectively connected to the heating water chamber (103). The housing (1) also has a flue gas inlet (1021) and a flue gas outlet (1022) that are respectively connected to the flue gas chamber (104). It also includes a heat pipe heat exchanger (2), which is located inside the shell (1) and forms a heating water cavity (103) and a flue gas cavity (104) that are not connected to each other; the heat pipe heat exchanger (2) includes a plurality of heat pipes (201), each heat pipe (201) including a condensing section (2012) and an evaporating section (2011), the condensing section (2012) being located inside the heating water cavity (103), the evaporating section (2011) being located inside the flue gas cavity (104), and a heat exchange medium being provided inside the heat pipe (201).

2. The waste heat recovery device for gas-fired heating hot water boiler according to claim 1, characterized in that: The housing (1) is provided with a partition plate (1023), which divides the housing (1) into the heating water chamber (103) and the flue gas chamber (104). The partition plate (1023) is provided with a mounting hole (10231), and the heat pipe heat exchanger (2) is inserted into the mounting hole (10231) and fixedly connected to the partition plate (1023). The condensing section (2012) and the evaporating section (2011) are located on both sides of the partition plate (1023).

3. The waste heat recovery device for gas-fired heating hot water boilers according to claim 2, characterized in that: The heat pipe heat exchanger (2) includes a fixed plate (202), the condensing section (2012) and the evaporating section (2011) are respectively fixedly connected to both sides of the fixed plate (202), and the fixed plate (202) is sealed and fixedly connected to the partition plate (1023).

4. The waste heat recovery device for gas-fired heating hot water boiler according to claim 3, characterized in that: A sealing element (4) is provided between the fixing plate (202) and the partition plate (1023); And / or, the fixing plate (202) is screwed (3) to the partition plate (1023).

5. The waste heat recovery device for a gas-fired heating hot water boiler according to any one of claims 1-4, characterized in that: The heat pipe heat exchanger (2) includes heat exchange fins (2013), which are disposed on the outer wall of the evaporation section (2011).

6. The waste heat recovery device for a gas-fired heating hot water boiler according to any one of claims 1-4, characterized in that: The housing (1) includes a first housing (101) and a second housing (102) that are detachably and sealed together. The first housing (101) is provided with the heating water inlet (1011) and the heating water outlet (1012), and the second housing (102) is provided with the flue gas inlet (1021) and the flue gas outlet (1022).

7. The waste heat recovery device for a gas-fired heating hot water boiler according to claim 6, characterized in that: The heating water inlet (1011) is located on the upper side of the first housing (101), and the heating water outlet (1012) is located on the lower side of the first housing (101). And / or, the flue gas inlet (1021) is located on the right side of the second housing (102), and the flue gas outlet (1022) is located on the upper side of the second housing (102).

8. The waste heat recovery device for a gas-fired heating hot water boiler according to claim 6, characterized in that: The bottom of the second housing (102) is provided with a condensate drain outlet (1024).

9. The waste heat recovery device for a gas-fired heating hot water boiler according to any one of claims 1-4 and 7-8, characterized in that: The heat pipe (201) is a copper-steel composite heat pipe, the inner wall of the heat pipe (201) is a copper wall, and the outer wall of the heat pipe (201) is a stainless steel wall.

10. A gas-fired heating and hot water boiler, characterized in that: The device includes a waste heat recovery device for a gas-fired heating and hot water boiler as described in any one of claims 1-9, a heating cold water inlet pipe (5) and a heating hot water outlet pipe (6), wherein the heating water inlet (1011) is connected to the heating cold water inlet pipe (5) and the heating water outlet (1012) is connected to the heating hot water outlet pipe (6).

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