An energy supply system based on heat recovery

Abstract

This utility model discloses an energy supply system based on heat recovery, including a boiler, a flue gas recovery unit, a first heat exchange unit, a second heat exchange unit, and a liquid storage tank. The boiler is used to heat liquid, and the generated high-temperature flue gas is discharged through the flue gas recovery unit. The first heat exchange unit is connected to the second heat exchange unit, with a portion of the first heat exchange unit adjacent to the flue gas recovery unit. The medium in the first heat exchange unit is used for heat exchange with the flue gas in the flue gas recovery unit. The liquid storage tank includes a first inlet and a first outlet, which are connected by a first pipeline. A portion of the first pipeline is adjacent to the second heat exchange unit, and the liquid in the first pipeline is used for heat exchange with the medium in the second heat exchange unit to obtain a heated liquid. Compared with the traditional method of supplying domestic hot water solely through boiler combustion, the energy supply system provided by this utility model can effectively improve energy utilization efficiency and reduce operating costs.

Description

Technical Field

[0001] This utility model relates to the field of energy recovery technology, and in particular to an energy supply system based on heat recovery. Background Technology

[0002] Traditional energy supply systems primarily rely on boiler combustion to provide domestic hot water and heating to users. However, the high-temperature flue gas produced by boiler combustion is typically emitted directly, with a temperature generally around 50°C, leading to energy loss to some extent.

[0003] On the other hand, during the summer, users generally have cooling and domestic hot water needs, but no heating needs. However, traditional energy supply systems with electric chillers can only provide cooling, not domestic hot water. Therefore, boilers still need to be started to meet the users' domestic hot water needs. Similarly, in spring or autumn, users generally only have domestic hot water needs, without heating or cooling requirements, but boilers still need to be started to meet these needs, all of which increase costs. Therefore, how to improve energy efficiency and reduce operating costs has become a pressing problem for those skilled in the art. Utility Model Content

[0004] This invention provides an energy supply system based on heat recovery to improve energy utilization efficiency and reduce operating costs.

[0005] This invention provides an energy supply system based on heat recovery. The system includes a boiler, a flue gas recovery unit, a first heat exchange unit, a second heat exchange unit, and a liquid storage tank. The boiler heats the liquid, and the generated high-temperature flue gas is discharged through the flue gas recovery unit. The first and second heat exchange units are connected, with portions of the first heat exchange unit adjacent to the flue gas recovery unit. The medium in the first heat exchange unit exchanges heat with the flue gas in the flue gas recovery unit. The liquid storage tank includes a first inlet and a first outlet, which are connected by a first pipeline. A portion of the first pipeline is adjacent to the second heat exchange unit, and the liquid in the first pipeline exchanges heat with the medium in the second heat exchange unit to obtain a heated liquid.

[0006] The energy supply system provided by this invention, since the flue gas recovery unit is adjacent to the first heat exchange unit, requires boiler combustion for heating in winter. The low-temperature medium in the first heat exchange unit exchanges heat with the high-temperature flue gas in the flue gas recovery unit, absorbing heat from the high-temperature flue gas to become a heated medium. This heated medium then enters the second heat exchange unit and exchanges heat with the liquid in the first pipeline connected to the storage tank, thus achieving both domestic hot water supply and flue gas waste heat recovery. Compared to the traditional method of supplying domestic hot water solely through boiler combustion, the energy supply system provided by this invention effectively improves energy utilization efficiency and reduces operating costs.

[0007] In one possible implementation of this invention, the energy supply system further includes a third heat exchange unit, where a medium is used for heat exchange with air. A portion of the third heat exchange unit is adjacent to the first heat exchange unit, and the medium within the third heat exchange unit is used for heat exchange with the medium within the first heat exchange unit. Compared to the traditional method of supplying domestic hot water solely through boiler combustion, the energy supply system provided by this invention eliminates the need for boiler combustion in spring or autumn. It allows for the absorption of heat from the air through the heat exchange unit to obtain domestic hot water, thereby effectively improving energy efficiency and reducing operating costs.

[0008] In one possible implementation of this utility model, the third heat exchange unit includes a second pipeline and a first on / off valve. The second pipeline is used to contain the medium, and a portion of the second pipeline is adjacent to the first heat exchange unit. The first on / off valve is located on the second pipeline and is used to control the on / off state of the second pipeline. Therefore, by using the energy supply system provided by this utility model, users can select different operating modes of the system in different seasons to effectively improve energy utilization and reduce operating costs while obtaining domestic hot water.

[0009] In one possible implementation of this invention, the energy supply system further includes a second switching valve, which is located in the flue gas recovery unit and used to control the on / off state of the flue gas recovery unit. This allows the energy supply system to be closed when heating is not required via a combustion boiler, or in case of a malfunction in the flue gas recovery unit, thereby improving the versatility and ease of maintenance.

[0010] In one possible implementation of this invention, the energy system further includes a third pipeline, a portion of which is adjacent to the first heat exchange unit. The high-temperature liquid in the third pipeline is used for heat exchange with the low-temperature medium of the first heat exchange unit to obtain a low-temperature liquid. Compared with the traditional method of supplying domestic hot water solely through boiler combustion, the energy supply system provided by this invention mainly utilizes the principle of heat exchange with ambient temperature, obtaining domestic hot water without boiler combustion, thereby effectively improving energy utilization efficiency and reducing operating costs.

[0011] In one possible implementation of this invention, the energy supply system further includes a third switching valve, which is installed in the third pipeline and used to control the on / off state of the third pipeline. This allows the third pipeline to be disconnected by closing the third switching valve when the user does not require cooling or in case of pipeline malfunction, thereby effectively improving the environmental adaptability and demand diversity of the energy supply system, as well as enhancing the ease of system maintenance.

[0012] In one possible implementation of this invention, the power supply system further includes a fourth switching valve, which is installed in the first pipeline and used to control the on / off state of the first pipeline. Thus, when a portion of the pipeline requiring maintenance needs to be repaired, it is not necessary to shut down the entire system; simply closing the corresponding switching valve allows for rapid maintenance of that portion of the pipeline, thereby effectively improving the system's ease of maintenance.

[0013] In one possible implementation of this invention, the energy supply system further includes a third heat exchange unit, part of which is adjacent to the second heat exchange unit. The medium in the third heat exchange unit exchanges heat with the medium in the second heat exchange unit. When the pipeline used to provide domestic hot water fails, the vaporized medium in the second heat exchange unit can exchange heat with the medium in the third heat exchange unit, allowing the medium in the second heat exchange unit to dissipate heat and liquefy normally, and then flow back to the first heat exchange unit for the next round of heat exchange, thereby improving the stability and reliability of the system operation.

[0014] In one possible implementation of this invention, the third heat exchange unit further includes a fourth pipeline and a fifth switching valve. The fourth pipeline is used to contain the medium, and a portion of the fourth pipeline is adjacent to the second heat exchange unit. The fifth switching valve is located on the fourth pipeline and is used to control the on / off state of the fourth pipeline. This effectively improves the system's versatility in meeting diverse needs and ease of maintenance.

[0015] In one possible implementation of this invention, the power supply system further includes a compressor and an expansion valve. The medium in the first heat exchange unit enters the second heat exchange unit via a fifth pipeline; the compressor is located on the fifth pipeline; the medium in the second heat exchange unit enters the first heat exchange unit via a sixth pipeline; and the expansion valve is located on the sixth pipeline. This effectively increases the temperature of domestic hot water. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a heat recovery-based energy supply system provided by this utility model.

[0017] Reference numerals in the attached drawings: 1-Boiler; 2-Flue gas recovery unit; 21-Flue gas pipeline; 22-Circulation pipeline; 3-First heat exchange unit; 4-Second heat exchange unit; 5-Liquid storage tank; 51-First liquid inlet; 52-First liquid outlet; 53-First pipeline; 6-Fifth pipeline; 7-Sixth pipeline; 8-Third heat exchange unit; 81-Second pipeline; 82-First switching valve; 83-Fourth pipeline; 84-Fifth switching valve; 9-Second switching valve; 10-Third pipeline; 101-Third switching valve; 102-Fourth switching valve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The terms expressing position and direction described in the embodiments of this utility model are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the protection scope of this utility model. The accompanying drawings of the embodiments of this utility model are only for illustrating relative positional relationships and do not represent actual proportions.

[0019] It should be noted that specific details are set forth in the following description to facilitate understanding of this utility model. However, this utility model can be implemented in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0020] Traditional energy supply systems primarily rely on boiler combustion to provide domestic hot water and heating. During spring, summer, or winter, users typically only need hot water and not heating, yet the boiler still needs to be started to supply hot water, increasing costs. Furthermore, the flue gas produced by boiler combustion is generally emitted directly, resulting in energy loss.

[0021] In view of this, the energy supply system provided by this utility model, by setting a heat exchange unit within the system to recover the heat energy of high-temperature flue gas, effectively improves energy utilization efficiency and reduces operating costs. To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] refer to Figure 1 , Figure 1This is a schematic diagram of a heat recovery-based energy supply system provided by this utility model. The energy supply system includes a boiler 1, a flue gas recovery unit 2, a first heat exchange unit 3, a second heat exchange unit 4, and a liquid storage tank 5. The boiler 1 is used to heat the liquid, and the exhaust system of the boiler 1 is connected to the flue gas recovery unit 2 so that the high-temperature flue gas generated by the boiler 1 is discharged through the flue gas recovery unit 2. Furthermore, the first heat exchange unit 3 is connected to the second heat exchange unit 4 so that the medium within the heat exchange units can circulate.

[0023] In the specific configuration of the flue gas recovery unit 2, the flue gas recovery unit 2 includes a flue gas pipeline 21 and a circulation pipeline 22. The exhaust system of the boiler 1 is connected to the flue gas pipeline 21 so that the high-temperature flue gas generated by the boiler 1 can be discharged through the flue gas pipeline 21. At the same time, the circulation pipeline 22 stores liquid, such as water, to facilitate heat exchange between the water in the pipeline and the high-temperature flue gas in the flue gas pipeline 21.

[0024] In the specific configuration of the first heat exchange unit 3, the first heat exchange unit 3 may, for example, include one or more U-shaped tubes. Multiple U-shaped tubes can be sequentially arranged by connecting them end-to-end, and the contents of the U-shaped tubes contain a low-temperature liquid medium for heat exchange. Furthermore, the first heat exchange unit 3 is partially adjacent to the circulation pipe 22 of the flue gas recovery unit 2. For example, the U-shaped tube of the first heat exchange unit 3 can be adjacent to the circulation pipe 22; specifically, the adjacent portion can be the part of the U-shaped tube furthest from the inlet and outlet ends. During the combustion process of the boiler 1, the temperature of the flue gas entering the flue gas pipe 21 is generally between 50°C and 55°C, while the temperature of the low-temperature liquid medium in the first heat exchange unit 3 is much lower than the temperature of the flue gas. Therefore, the low-temperature liquid medium absorbs heat and vaporizes (the temperature of the vaporized medium is greater than the temperature of the low-temperature liquid medium), and the vaporized medium enters the second heat exchange unit 4 through the pipe.

[0025] It is understandable that the temperature of the high-temperature flue gas decreases after heat exchange with the low-temperature liquid medium, and the temperature of the cooled flue gas is generally between 20℃ and 25℃.

[0026] In the specific configuration of the liquid storage tank 5, the liquid storage tank 5 includes a first liquid inlet 51 and a first liquid outlet 52. The first liquid inlet 51 and the first liquid outlet 52 are connected by a first pipe 53, so that the liquid in the liquid storage tank 5 flows into the first pipe 53 through the first liquid outlet 52, and then flows back to the liquid storage tank 5 through the first liquid inlet 51, continuously circulating. Furthermore, a portion of the first pipe 53 is adjacent to the second heat exchange unit 4, allowing the circulating liquid in the first pipe 53 to exchange heat with the vaporized medium in the second heat exchange unit 4. The liquid in the first pipe 53 then flows back to the liquid storage tank 5 after being heated, resulting in a heated liquid. Additionally, the liquid in the liquid storage tank 5 is generally water. The second heat exchange unit 4 can be, for example, a condenser, and the vaporized medium becomes liquefied after being cooled by the condenser, flowing back to the first heat exchange unit 3 for the next round of heat exchange.

[0027] It should be noted that the liquid storage tank 5 also includes a second inlet and a second outlet. The second inlet is used to connect to an external ambient temperature water source so that the liquid storage tank 5 always has water in it, and the heated water in the liquid storage tank 5 flows into the user end through the second outlet to supply domestic hot water to the user.

[0028] The energy supply system provided by this invention, since part of the flue gas recovery unit 2 is adjacent to the first heat exchange unit 3, requires the boiler 1 to be burned for heating in winter. The low-temperature medium in the first heat exchange unit 3 can exchange heat with the high-temperature flue gas in the flue gas recovery unit 2, absorbing heat from the high-temperature flue gas to obtain a heated medium. This heated medium then enters the second heat exchange unit 4 and exchanges heat with the liquid in the first pipe 53 connected to the storage tank 5, thus achieving flue gas waste heat recovery while providing domestic hot water for users. Compared to the traditional method of supplying domestic hot water solely through boiler 1 combustion, the energy supply system provided by this invention can effectively improve energy utilization efficiency and reduce operating costs.

[0029] In an optional embodiment, the power supply system further includes a compressor and an expansion valve. During the process of the medium (hereinafter referred to as the medium-temperature low-pressure medium) that has been heated and vaporized in the first heat exchange unit 3 entering the second heat exchange unit 4 through the fifth pipeline 6, the compressor continues to pressurize the medium-temperature low-pressure medium to obtain a high-temperature high-pressure medium. After entering the second heat exchange unit 4, the high-temperature high-pressure medium exchanges heat with the water in the first pipeline 53 connected to the liquid storage tank 5, thereby effectively increasing the temperature of the domestic water.

[0030] Furthermore, the high-temperature, high-pressure medium in the second heat exchange unit 4 liquefies into a low-temperature, low-pressure liquid after heat exchange with the water in the first pipe 53 connected to the storage tank 5. For example, after the heat exchange, the water temperature in the first pipe 53 can be raised from 50°C to 60°C before flowing back into the storage tank 5, ensuring that the water temperature in the storage tank 5 remains within the range required by the user. Simultaneously, the low-temperature, low-pressure liquid flows back to the first heat exchange unit 3 via the sixth pipe 7 and the expansion valve located on the sixth pipe 7 for the next round of heat exchange.

[0031] In one specific implementation, such as Figure 1As shown, the energy supply system also includes a third heat exchange unit 8. In spring or autumn, it is understood that users do not have heating or cooling needs, but still require domestic hot water. The medium in the third heat exchange unit 8 is used for heat exchange with the air; that is, the medium in the third heat exchange unit 8 absorbs heat from the air to obtain a heated medium. It should be noted that before the heat exchange unit 8 exchanges heat with the air, the temperature of the medium in the third heat exchange unit 8 is lower than the air temperature. For example, the temperature of the medium in the third heat exchange unit 8 can be raised from 5°C to 10°C.

[0032] In addition, since part of the third heat exchange unit 8 is adjacent to the first heat exchange unit 3, the heated medium in the third heat exchange unit 8 can exchange heat with the low-temperature liquid medium in the first heat exchange unit 3. The low-temperature liquid medium absorbs heat and vaporizes. The vaporized medium enters the second heat exchange unit 4 through the pipeline, so that the vaporized medium in the second heat exchange unit 4 exchanges heat with the circulating water in the first pipeline 53 of the storage tank 5. The water in the first pipeline 53 is heated and flows back to the storage tank 5, thereby obtaining heated domestic hot water.

[0033] Compared to the traditional method of supplying domestic hot water solely through combustion in boiler 1, the energy supply system provided by this utility model eliminates the need to burn boiler 1 in spring or autumn. Instead, it allows for the absorption of heat from the air by the heat exchange unit to obtain domestic hot water, thereby effectively improving energy efficiency and reducing operating costs.

[0034] When specifically configuring the third heat exchange unit 8, such as Figure 1 As shown, the third heat exchange unit 8 includes a second pipe 81 and a first switching valve 82. The second pipe 81 is used to contain the medium, and a portion of the second pipe 81 is adjacent to the first heat exchange unit 3. The first switching valve 82 is located on the second pipe 81 and is used to control the on / off state of the second pipe 81. Thus, in winter, when users have heating needs, due to the low ambient temperature and the boiler 1 being in combustion mode, the first switching valve 82 can be closed to disconnect the second pipe 81, meaning the first heat exchange unit 3 cannot continue heat exchange with the third heat exchange unit 8. It can be understood that at this time, the first heat exchange unit 3 only exchanges heat with the flue gas recovery unit 2. Therefore, using the energy supply system provided by this utility model, users can select different operating modes of the system in different seasons to effectively improve energy utilization and reduce operating costs while obtaining domestic hot water.

[0035] In addition, the third heat exchange unit 8 also includes a fan, a spray device, and a liquid collection tank. The fan and the spray device are sequentially arranged above the liquid collection tank. One end of the second pipe 81 is connected to the spray device, and the other end of the second pipe 81 is connected to the liquid outlet of the liquid collection tank, so that the medium in the third heat exchange unit 8 enters the spray device through the second pipe 81 and is sprayed into the liquid collection tank along the direction of gravity. During the liquid spraying process, the fan draws air in the opposite direction of gravity, so that the falling low-temperature droplets come into full contact with the flowing high-temperature air, thereby raising the temperature of the liquid entering the liquid collection tank, which is then used to continue heat exchange with the low-temperature medium in the first heat exchange unit 3.

[0036] It should be noted that this utility model does not limit the specific location of the third heat exchange unit. For example, a portion of the third heat exchange unit 8 can be located outdoors for effective heat exchange with outdoor air. The first heat exchange unit 3 and the second heat exchange unit 4 can be located indoors.

[0037] It is worth mentioning that, such as Figure 1 As shown, the energy supply system also includes a second switching valve 9, which is installed in the flue gas recovery unit 2 and is used to control the opening and closing of the circulation pipeline 22 of the flue gas recovery unit 2. In spring, summer or autumn when heating is not required by the combustion boiler 1, or when the flue gas recovery unit 2 malfunctions, the second switching valve 9 can be closed to improve the versatility and ease of maintenance of the energy supply system.

[0038] In one alternative implementation, such as Figure 1 As shown, the energy supply system also includes a third pipe 10, a portion of which is adjacent to the first heat exchange unit 3. It is understood that in summer, users have cooling needs but no heating needs, yet still require domestic hot water. Specifically, the third pipe 10 is a circulating pipe, and the portion of the third pipe 10 furthest from the first heat exchange unit 3 is located at the user end for supplying cooling to the user. It is understood that if the temperature of the liquid in the third pipe 10 at the user end is lower than the ambient temperature, the liquid in the third pipe 10 absorbs heat from the user end, thereby lowering the ambient temperature and achieving the purpose of cooling.

[0039] Furthermore, since the portion of the third pipe 10 furthest from the user end is adjacent to the first heat exchange unit 3, the liquid in the third pipe 10, after absorbing heat from the user end environment and heating up, flows back to the end closest to the first heat exchange unit 3. For example, the heated liquid temperature in the third pipe 10 can be 12°C. Further, the low-temperature liquid medium in the first heat exchange unit 3 exchanges heat with the heated liquid in the third pipe 10, thereby lowering the liquid temperature in the third pipe 10. For example, the cooled liquid temperature in the third pipe 10 can be 7°C. The cooled liquid can then continue to flow through the third pipe 10 to the user end for continued cooling.

[0040] Meanwhile, the low-temperature liquid medium in the first heat exchange unit 3 absorbs heat and vaporizes. The vaporized medium then flows to the second heat exchange unit 4, where it continues to exchange heat with the liquid in the first pipe 53 connected to the storage tank 5, thus producing domestic hot water for users. Furthermore, the medium in the second heat exchange unit 4 dissipates heat, liquefies, and flows back to the first heat exchange unit 3 for the next round of heat exchange. Compared to the traditional method of supplying domestic hot water solely through combustion in the boiler 1, the energy supply system provided by this invention primarily utilizes the principle of heat exchange with ambient temperature, eliminating the need for combustion in the boiler 1 to obtain domestic hot water, thereby effectively improving energy efficiency and reducing operating costs.

[0041] It is understandable that boiler 1 is not only used for heating or providing domestic hot water. Especially in summer, if boiler 1 needs to be turned on for other needs, the second switch valve 9 must be closed to disconnect the flue gas recovery unit 2, so as to avoid heat exchange between the high-temperature flue gas in the flue gas recovery unit 2 and the low-temperature medium in the first heat exchange unit 3, which would reduce the cooling effect.

[0042] Furthermore, during the summer, the first switch valve 82 must be closed to ensure that the low-temperature liquid medium in the first heat exchange unit 3 exchanges heat only with the high-temperature liquid in the third pipeline 10.

[0043] In addition, the energy supply system provided by this utility model also includes a chiller and a cooling tower for supplying cooling to users. The method of using the chiller and cooling tower for cooling is prior art and will not be described in detail here.

[0044] It is worth mentioning that, such as Figure 1 As shown, the energy supply system also includes a third switching valve 101, which is installed in the third pipeline 10 and used to control the on / off state of the third pipeline 10. Thus, when the user does not require cooling or there is a pipeline malfunction, the third switching valve 101 can be closed to disconnect the third pipeline 10, thereby effectively improving the environmental adaptability and demand diversity of the energy supply system, as well as enhancing the ease of system maintenance.

[0045] In addition, the power supply system also includes a fourth switch valve 102, which is installed in the first pipeline 53 to control the opening and closing of the first pipeline 53. In this way, when the power supply system needs to maintain a certain part of the pipeline, it is not necessary to shut down the entire system. Only the corresponding switch valve needs to be closed to achieve rapid maintenance of the part of the pipeline, thereby effectively improving the maintenance convenience of the system.

[0046] In one alternative implementation, such as Figure 1 As shown, a portion of the third heat exchange unit 8 of the cooling system can be adjacent to the second heat exchange unit 4. Since the second heat exchange unit 4 mainly obtains domestic hot water through heat dissipation, when the pipeline used to provide domestic hot water fails, the vaporized medium in the second heat exchange unit 4 can exchange heat with the medium in the third heat exchange unit 8, so that the medium in the second heat exchange unit 4 can dissipate heat and liquefy normally, and then flow back to the first heat exchange unit 3 for the next round of heat exchange, so as to improve the stability and reliability of the system operation.

[0047] In the specific configuration of the third heat exchange unit 8, it also includes a fourth pipe 83 and a fifth switching valve 84. The fourth pipe 83 is used to contain the medium, and a portion of the fourth pipe 83 is adjacent to the second heat exchange unit 4 for heat exchange. It should be noted that the fourth pipe 83 and the second pipe 81 are independent and do not affect each other. One end of the fourth pipe 83 is connected to the spraying equipment, and the other end is connected to the outlet of the collection tank, so that the medium in the third heat exchange unit 8 enters the spraying equipment through the fourth pipe 83. Furthermore, the temperature of the medium in the second heat exchange unit 4 is higher than the ambient temperature.

[0048] In addition, the fifth switching valve 84 is installed in the fourth pipeline 83 to control the on / off state of the fourth pipeline 83, thereby effectively improving the diversity of system requirements and the convenience of maintenance.

[0049] In summary, the energy supply system provided by this invention, since part of the flue gas recovery unit 2 is adjacent to the first heat exchange unit 3, allows the low-temperature medium in the first heat exchange unit 3 to exchange heat with the high-temperature flue gas in the flue gas recovery unit 2 during winter. The low-temperature medium absorbs heat from the high-temperature flue gas, thus becoming a heated medium. This heated medium then enters the second heat exchange unit 4 and exchanges heat with the liquid in the first pipe 53 connected to the storage tank 5, thereby achieving flue gas waste heat recovery while simultaneously providing domestic hot water for users. Compared to the traditional method of supplying domestic hot water solely through boiler 1 combustion, the energy supply system provided by this invention effectively improves energy utilization efficiency and reduces operating costs.

[0050] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. An energy supply system based on heat recovery, characterized in that, The system includes a boiler, a flue gas recovery unit, a first heat exchange unit, a second heat exchange unit, and a liquid storage tank. The boiler is used to heat liquids, and the high-temperature flue gas generated is discharged through the flue gas recovery unit. The first heat exchange unit is connected to the second heat exchange unit, wherein: The first heat exchange unit is partially adjacent to the flue gas recovery unit, and the medium in the first heat exchange unit is used for heat exchange with the flue gas in the flue gas recovery unit. The liquid storage tank includes a first liquid inlet and a first liquid outlet, which are connected by a first pipeline. A portion of the first pipeline is adjacent to the second heat exchange unit. The liquid in the first pipeline is used to exchange heat with the medium in the second heat exchange unit to obtain a heated liquid.

2. The energy supply system according to claim 1, characterized in that, The power supply system also includes a third heat exchange unit, in which the medium is used for heat exchange with air; The third heat exchange unit is partially adjacent to the first heat exchange unit, and the medium in the third heat exchange unit is used for heat exchange with the medium in the first heat exchange unit.

3. The energy supply system according to claim 2, characterized in that, The third heat exchange unit includes a second pipeline and a first switching valve. The second pipeline is used to contain the medium, and a portion of the second pipeline is adjacent to the first heat exchange unit. The first switching valve is installed in the second pipeline and is used to control the on / off state of the second pipeline.

4. The energy supply system according to claim 1, characterized in that, The power supply system also includes a second switching valve, which is disposed in the flue gas recovery unit and is used to control the on / off state of the flue gas recovery unit.

5. The energy supply system according to any one of claims 1 to 4, characterized in that, The power supply system also includes a third pipeline, a portion of which is adjacent to the first heat exchange unit. The high-temperature liquid in the third pipeline is used for heat exchange with the low-temperature medium of the first heat exchange unit to obtain a low-temperature liquid.

6. The energy supply system according to claim 5, characterized in that, The power supply system also includes a third switching valve, which is installed in the third pipeline and is used to control the on / off state of the third pipeline.

7. The energy supply system according to claim 1, characterized in that, The power supply system also includes a fourth switching valve, which is installed in the first pipeline and is used to control the on / off state of the first pipeline.

8. The energy supply system according to claim 1 or 7, characterized in that, The energy supply system also includes a third heat exchange unit, a portion of which is adjacent to the second heat exchange unit, and the medium in the third heat exchange unit exchanges heat with the medium in the second heat exchange unit.

9. The energy supply system according to claim 8, characterized in that, The third heat exchange unit further includes a fourth pipeline and a fifth switching valve. The fourth pipeline is used to contain the medium, and a portion of the fourth pipeline is adjacent to the second heat exchange unit. The fifth switching valve is installed in the fourth pipeline and is used to control the on / off state of the fourth pipeline.

10. The energy supply system according to claim 1, characterized in that, The power supply system also includes a compressor and an expansion valve. The medium in the first heat exchange unit enters the second heat exchange unit via a fifth pipeline. The compressor is located on the fifth pipeline. The medium in the second heat exchange unit enters the first heat exchange unit through the sixth pipeline; the expansion valve is located in the sixth pipeline.

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