A waste heat recovery system

Abstract

This utility model relates to a waste heat recovery system, including a chiller unit, a heat sink, a first branch pipe, and a second branch pipe. The first outlet of the chiller unit is connected to the inlet of the heat sink via the first pipe, and the first inlet of the chiller unit is connected to the outlet of the heat sink via the second pipe. The air inlet of the heat sink is connected to the air outlet of the boiler. The inlet of the first branch pipe is connected to the second outlet of the chiller unit, and the outlet of the first branch pipe is connected to the first pipe. The inlet of the second branch pipe is connected to the second pipe, and the outlet of the second branch pipe is connected to the second inlet of the chiller unit. Beneficial effects: By connecting the flue gas to the heat sink and using valves to switch between the various pipes and branch pipes, the chiller unit can be used as a heat pump to preheat the boiler's circulating water. Simultaneously, the flue gas is discharged after passing through the heat sink, achieving a "whitening" effect.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically a waste heat recovery system. Background Technology

[0002] Conventional air conditioning systems using gas-fired boilers and electric chillers experience a decrease in flue gas emission temperature as the heating system water temperature tends to drop. However, during winter use, the flue gas emitted from the gas-fired boiler still has high sensible heat, resulting in resource waste. Furthermore, because the condensation temperature of the flue gas discharged into the atmosphere is higher than the outdoor temperature in winter, "white smoke" often appears at the chimney outlet, which is visually unappealing. Utility Model Content

[0003] This utility model addresses the technical problems existing in the prior art by providing a waste heat recovery system that can recover and reuse the heat in boiler flue gas, while also "eliminating whitening" of the chimney exhaust.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0005] A waste heat recovery system is provided, including a chiller unit, heat dissipation components, a first branch pipe, and a second branch pipe;

[0006] The first water outlet of the chiller unit is connected to the water inlet of the heat sink through a first pipeline, the first water inlet of the chiller unit is connected to the water outlet of the heat sink through a second pipeline, and the air inlet of the heat sink is connected to the air outlet of the boiler.

[0007] The inlet end of the first branch pipe is connected to the second outlet end of the chiller unit, and the outlet end of the first branch pipe is connected to the first pipe.

[0008] The inlet end of the second branch pipe is connected to the second pipe, and the outlet end of the second branch pipe is connected to the second water inlet side of the chiller unit.

[0009] As a further technical solution, a first butterfly valve is provided on the first pipeline, and the first butterfly valve is located in the pipeline section between the first pipeline and the chiller unit.

[0010] As a further technical solution, a second butterfly valve is provided on the second pipeline, and the second butterfly valve is located in the section of the pipeline between the second pipeline and the chiller unit.

[0011] As a further technical solution, the second water outlet side of the chiller unit is connected to the water supply pipeline, and the second water inlet side of the chiller unit is connected to the return water pipeline.

[0012] As a further technical solution, it also includes a third branch pipe, a fourth branch pipe, a fifth branch pipe, and a sixth branch pipe;

[0013] The inlet end of the third branch pipe is connected to the return water pipe, the outlet end of the third branch pipe is connected to the second pipe, and the outlet end of the third branch pipe is located between the chiller unit and the second butterfly valve.

[0014] The inlet of the fourth branch pipe is connected to the water supply pipe, and the inlet of the fourth branch pipe is located between the cooling unit and the first butterfly valve; the outlet of the fourth branch pipe is connected to the first outlet side of the chiller unit.

[0015] The inlet of the fifth branch pipe is connected to the water supply pipe, and the outlet of the fifth branch pipe is connected to the inlet of the boiler.

[0016] The inlet of the sixth branch pipe is connected to the outlet of the boiler, and the outlet of the sixth branch pipe is connected to the water supply pipe.

[0017] A third butterfly valve is provided on the water supply pipeline. The inlet end of the fifth branch pipeline and the outlet end of the sixth branch pipeline are located on both sides of the third butterfly valve, and the inlet end of the fifth branch pipeline is located on the side of the water supply pipeline closer to the chiller unit.

[0018] As a further technical solution, a first water pump is provided on the second pipeline, and the first water pump is located between the water inlet end of the second branch pipeline and the heat sink.

[0019] A second water pump is installed on the water supply pipeline, and the second water pump is located between the water inlet of the fifth branch pipeline and the chiller unit.

[0020] As a further technical solution, a fourth butterfly valve is provided on the water supply pipeline, and the fourth butterfly valve is located between the first branch pipeline and the fourth branch pipeline.

[0021] As a further technical solution, a fifth butterfly valve is provided on the return water pipeline, and the fifth butterfly valve is located between the second branch pipeline and the third branch pipeline.

[0022] As a further technical solution, the first branch pipeline, the second branch pipeline, the third branch pipeline, the fourth branch pipeline, the fifth branch pipeline, and the sixth branch pipeline are respectively equipped with a sixth butterfly valve, a seventh butterfly valve, an eighth butterfly valve, a ninth butterfly valve, a tenth butterfly valve, and an eleventh butterfly valve.

[0023] The beneficial effects of this utility model are: by connecting the flue gas to the heat dissipation component and using valves to switch the various pipes and branch pipes, the chiller unit can be used as a heat pump to preheat the circulating water of the boiler. At the same time, the flue gas is discharged after passing through the heat dissipation component, which can achieve the effect of "eliminating white spots". Attached Figure Description

[0024] Figure 1 This is a structural diagram of a waste heat recovery system according to the present invention;

[0025] Figure 2 This is a schematic diagram of a waste heat recovery system of this utility model in refrigeration operation.

[0026] Figure 3 This is a schematic diagram of the operating conditions of the waste heat recovery system of this utility model during heating operation.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Chiller unit; 2. Heat sink; 3. First branch pipe; 4. Second branch pipe; 5. First pipe; 6. Second pipe; 7. Boiler; 8. Chimney; 9. First butterfly valve; 10. Second butterfly valve; 11. Water supply pipe; 12. Water return pipe; 13. Third branch pipe; 14. Fourth branch pipe; 15. Fifth branch pipe; 16. Sixth branch pipe; 17. Third butterfly valve; 18. First water pump; 19. Second water pump; 20. Fourth butterfly valve; 21. Fifth butterfly valve; 22. Sixth butterfly valve; 23. Seventh butterfly valve; 24. Eighth butterfly valve; 25. Ninth butterfly valve; 26. Tenth butterfly valve; 27. Eleventh butterfly valve; 28. Cover plate. Detailed Implementation

[0029] 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.

[0030] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0031] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0032] Example 1

[0033] See Figures 1-3 This embodiment provides a waste heat recovery system, including a chiller unit 1, a heat sink 2, a first branch pipe 3, and a second branch pipe 4. The first water outlet A1 of the chiller unit 1 is connected to the water inlet of the heat sink 2 through the first pipe 5, and the first water inlet B1 of the chiller unit 1 is connected to the water outlet of the heat sink 2 through the second pipe 6. The air inlet of the heat sink 2 is connected to the air outlet of the boiler 7. The heat sink 2 can perform heat exchange on the water from the chiller unit 1, thereby improving the cooling effect of the chiller unit 1.

[0034] The inlet end of the first branch pipe 3 is connected to the second outlet side A2 of the chiller unit 1, and the outlet end of the first branch pipe 3 is connected to the first pipe 5; the inlet end of the second branch pipe 4 is connected to the second pipe 6, and the outlet end of the second branch pipe 4 is connected to the second inlet side B2 of the chiller unit 1.

[0035] It should be noted that the chiller unit 1 includes a condenser and an evaporator. Therefore, the first water outlet side A1 and the first water inlet side B1 of the chiller unit 1 are both the water outlet and water inlet sides of the condenser; the second water outlet side A2 and the second water inlet side B2 of the chiller unit 1 are both the water outlet and water inlet sides of the evaporator. For example, the heat dissipation component 2 is a cooling tower. Furthermore, when cooling, the cover plate 28 on the air inlet side of the cooling tower is opened, while when heating, the cover plate 28 on the air inlet side of the cooling tower is closed to prevent flue gas from escaping from the air inlet side.

[0036] It should be noted that when waste heat recovery is required, the boiler 7 is turned on, and the flue gas in the boiler 7 enters the heat sink 2 through the chimney 8; while the water on the evaporator side of the chiller unit 1 flows through the first branch pipe 3 and the first pipe 5 to the heat sink 2 for heat exchange (so that the cold water from the evaporator side exchanges heat with the flue gas in the heat sink 2), and then flows back to the evaporator of the chiller unit 1 through the second pipe 6 and the second branch pipe 4, making full use of the heat in the flue gas, saving energy, and at the same time achieving the "whitening" treatment of the exhaust gas from the chimney 8.

[0037] Furthermore, a first butterfly valve 9 is provided on the first pipeline 5, and the first butterfly valve 9 is located in the pipeline section between the first pipeline 5 and the chiller unit 1; a second butterfly valve 10 is provided on the second pipeline 6, and the second butterfly valve 10 is located in the pipeline section between the second pipeline 6 and the chiller unit 1. For example, when the chiller unit 1 is heating, the first butterfly valve 9 and the second butterfly valve 10 are closed; while when the chiller unit 1 is cooling, the first butterfly valve 9 and the second butterfly valve 10 are open. At this time, the first branch pipeline 3 and the second branch pipeline 4 are not working.

[0038] It should be noted that the second outlet side A2 of the chiller unit 1 is connected to the water supply pipeline 11, and the second inlet side B2 of the chiller unit 1 is connected to the return water pipeline 12. Therefore, when cooling is required, the boiler 7 is not in operation. At this time, the water from the user side C passes sequentially through the return water pipeline 12, the evaporator side of the chiller unit 1, the condenser side of the chiller unit 1, the first pipeline 5, and the heat dissipation component 2 for heat exchange and cooling, and then passes through the second pipeline 6, the condenser side of the chiller unit 1, the evaporator side of the chiller unit 1, and the water supply pipeline 11 to the user side D. (During this process, the first branch pipeline 3 and the second branch pipeline 4 are not in operation.)

[0039] See Figures 1-3In its specific implementation, the system also includes a third branch pipe 13, a fourth branch pipe 14, a fifth branch pipe 15, and a sixth branch pipe 16. The inlet of the third branch pipe 13 is connected to the return pipe 12, and the outlet of the third branch pipe 13 is connected to the second pipe 6, with the outlet located between the chiller unit 1 and the second butterfly valve 10. The inlet of the fourth branch pipe 14 is connected to the supply pipe 11, and the inlet of the fourth branch pipe 14 is located between the chiller unit 1 and the first butterfly valve 9. The outlet of the fourth branch pipe 14 is connected to the chiller unit... The first outlet side A1 of the unit is connected; the inlet end of the fifth branch pipe 15 is connected to the water supply pipe 11, and the outlet end of the fifth branch pipe 15 is connected to the inlet end of the boiler 7; the inlet end of the sixth branch pipe 16 is connected to the outlet end of the boiler 7, and the outlet end of the sixth branch pipe 16 is connected to the water supply pipe 11; a third butterfly valve 17 is provided on the water supply pipe 11, the inlet end of the fifth branch pipe 15 and the outlet end of the sixth branch pipe 16 are located on both sides of the third butterfly valve 17, and the inlet end of the fifth branch pipe 15 is located on the side of the water supply pipe 11 closer to the chiller unit 1.

[0040] It should be noted that when heating is required, the first butterfly valve 9, the second butterfly valve 10, and the third butterfly valve 17 are all closed. The chiller unit 1, the radiator 2, and the boiler 7 are in operation, and the flue gas in the boiler 7 enters the radiator 2 through the chimney 8. At this time, the chilled water from the user side C passes through the return water pipe 12, the third branch pipe 13, the condenser side of the chiller unit 1, the fourth branch pipe 14, the supply water pipe 11, the fifth branch pipe 15, the boiler 7, the sixth branch pipe 16, and the supply water pipe 11 before reaching the user side D.

[0041] Furthermore, a first water pump 18 is installed on the second pipeline 6, and the first water pump 18 is located between the water inlet end of the second branch pipeline 4 and the heat sink 2; a second water pump 19 is installed on the water supply pipeline 11, and the second water pump 19 is located between the water inlet end of the fifth branch pipeline 15 and the chiller unit 1. When the system is in cooling operation, both the first water pump 18 and the second water pump 19 are turned on; when recovering waste heat from the flue gas in the boiler 7, the first water pump 18 is turned on and the second water pump 19 is turned off; when using the heat from the boiler 7 for heating, the first water pump 18 is turned off and the second water pump 19 is turned on, so that water from the user side C is heated first and then heated second to be used by the user side D.

[0042] See Figures 1-3In the specific implementation, a fourth butterfly valve 20 is provided on the water supply pipeline 11, and the fourth butterfly valve 20 is located between the first branch pipeline 3 and the fourth branch pipeline 14; a fifth butterfly valve 21 is provided on the return water pipeline 12, and the fifth butterfly valve 21 is located between the second branch pipeline 4 and the third branch pipeline 13. When cooling, the fourth butterfly valve 20 and the fifth butterfly valve 21 are open; when heating, the fourth butterfly valve 20 and the fifth butterfly valve 21 are closed.

[0043] Furthermore, the first branch pipe 3, the second branch pipe 4, the third branch pipe 13, the fourth branch pipe 14, the fifth branch pipe 15, and the sixth branch pipe 16 are respectively equipped with a sixth butterfly valve 22, a seventh butterfly valve 23, an eighth butterfly valve 24, a ninth butterfly valve 25, a tenth butterfly valve 26, and an eleventh butterfly valve 27, so that the waste heat recovery system of this embodiment can operate in both cooling and heating modes.

[0044] This embodiment is implemented as follows:

[0045] 1. When the waste heat recovery system of this embodiment is in cooling operation (see...) Figure 2 ):

[0046] The sixth butterfly valve 22, the seventh butterfly valve 23, the eighth butterfly valve 24, the ninth butterfly valve 25, the tenth butterfly valve 26, and the eleventh butterfly valve 27 are all closed, while the first butterfly valve 9, the second butterfly valve 10, the third butterfly valve 17, the fourth butterfly valve 20, the fifth butterfly valve 21, the first water pump 18, and the second water pump 19 are all open.

[0047] For example, the water from the return water pipe 12 is at 12°C. This water sequentially passes through the fifth butterfly valve 21, the second inlet side B2 of the chiller unit 1, the first outlet side A1 of the chiller unit 1, and the first pipe 5 to the heat exchanger 2. Then, it sequentially passes through the second pipe 6, the first water pump 18, the first inlet side B1, the second outlet side A2, the fourth butterfly valve 20, the second water pump 19, and the third butterfly valve 17 before reaching the user side C. It should be noted that the water temperature at the user side D is 7°C at this point. (The cover plate 28 is open during this process.)

[0048] 2. When the waste heat recovery system of this embodiment is in heating operation (see...) Figure 3 ), enter the following two paths:

[0049] Path 1: Flue gas waste heat recovery:

[0050] The first butterfly valve 9, the second butterfly valve 10, the third butterfly valve 17, the fourth butterfly valve 20, and the fifth butterfly valve 21 are all closed by their cover plates 28. The sixth butterfly valve 22, the seventh butterfly valve 23, the eighth butterfly valve 24, the ninth butterfly valve 25, the tenth butterfly valve 26, the eleventh butterfly valve 27, the chiller unit 1, the radiator 2, and the boiler 7 are all open. The flue gas in the boiler 7 is discharged from the chimney 8 into the radiator 2, while the chilled water (e.g., 7°C) in the chiller unit 1 passes through the second outlet side A2, the first branch pipe 3, the first pipe 5, and the radiator 2 in sequence, so that the chilled water from the chiller unit 1 exchanges heat with the flue gas in the radiator 2 and is heated (e.g., heated to 12°C). The heated water then passes through the second pipe 6, the first water pump 18, the second branch pipe 4, and the second inlet side B2 into the evaporator of the chiller unit 1.

[0051] Path 2, to the user's side for water heating:

[0052] The chiller unit 1 transports low-temperature water (e.g., 32°C) from the user side C through the return water pipeline 12 to the third branch pipeline 13, and then sequentially through the first water inlet side B1 and the condenser of the chiller unit 1 for heat exchange and temperature increase (e.g., to 37°C), thus completing the initial temperature increase. The heated water then sequentially passes through the fourth branch pipeline 14, the second water pump 19, the fifth branch pipeline 15, and the boiler 7 for a second temperature increase (e.g., to 42°C), and then through the sixth branch pipeline 16 and the water supply pipeline 11 to the user side D.

[0053] It should be noted that paths 1 and 2 are opened simultaneously. That is, during the operation of the boiler 7, the flue gas generated can be discharged into the heat dissipation component 2 to increase the water temperature in the evaporator of the chiller unit 1. The heat from the evaporator side is then transferred to the condenser side to increase the water supply temperature on the condenser side. Alternatively, paths 1 and 2 can be opened separately. For example, path 2 can be opened first to discharge the flue gas into the heat dissipation component 2 for storage. When path 1 needs to be opened, the waste heat from path 2 can be utilized.

[0054] It should be noted that the chiller unit 1 is a refrigeration chiller unit 1, and the terminal of the system in this embodiment can be heated by fan coil units or underfloor heating; the first water pump 18 and the second water pump 19 are both circulating water pumps, more specifically, they can be variable frequency water pumps, which can be adjusted by frequency conversion to meet the flow requirements of the system; and the outlet pressure of the chimney 8 should be greater than the packing resistance of the cooling tower to ensure smooth exhaust.

[0055] The system protected in this embodiment can turn on equipment such as cooling towers and chillers in winter, and switch the system by opening and closing the butterfly valves in the system to achieve heating. The flue gas emitted from the chimney is introduced into the heat exchanger, and heat is exchanged with water through the packing in the heat exchanger, which then transfers the heat to the circulating heating water. The chiller transfers heat from the evaporator side to the condenser side, increasing the system's water supply temperature and realizing the recovery of heat from the flue gas emitted from the chimney. At the same time, it reduces the emission temperature of the flue gas, and its condensation temperature is lower than the outdoor air temperature, achieving the purpose of "whitening" the exhaust. The chiller and the heat exchanger also increase the effective utilization hours throughout the year.

[0056] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0057] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0058] 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. A waste heat recovery system, characterized by, Includes a chiller unit (1), a heat sink (2), a first branch pipe (3), and a second branch pipe (4); The first outlet side A1 of the chiller unit (1) is connected to the inlet of the heat sink (2) through the first pipe (5), the first inlet side B1 of the chiller unit (1) is connected to the outlet of the heat sink (2) through the second pipe (6), and the air inlet of the heat sink (2) is connected to the air outlet of the exhaust component (7). The inlet end of the first branch pipe (3) is connected to the second outlet side A2 of the chiller unit (1), and the outlet end of the first branch pipe (3) is connected to the first pipe (5). The inlet end of the second branch pipe (4) is connected to the second pipe (6), and the outlet end of the second branch pipe (4) is connected to the second water inlet side B2 of the chiller unit (1).

2. A waste heat recovery system according to claim 1, wherein The first pipeline (5) is provided with a first butterfly valve (9), and the first butterfly valve (9) is located in the section between the first pipeline (5) and the chiller unit (1).

3. The waste heat recovery system according to claim 2, characterized in that, The second pipeline (6) is provided with a second butterfly valve (10), and the second butterfly valve (10) is located in the section between the second pipeline (6) and the chiller unit (1).

4. A waste heat recovery system according to claim 3, wherein The second outlet side A2 of the chiller unit (1) is connected to the water supply pipeline (11), and the second inlet side B2 of the chiller unit (1) is connected to the return water pipeline (12).

5. A waste heat recovery system according to claim 4, wherein, It also includes the third branch pipe (13), the fourth branch pipe (14), the fifth branch pipe (15), and the sixth branch pipe (16). The inlet end of the third branch pipe (13) is connected to the return pipe (12), the outlet end of the third branch pipe (13) is connected to the second pipe (6), and the outlet end of the third branch pipe (13) is located between the chiller unit (1) and the second butterfly valve (10). The inlet end of the fourth branch pipe (14) is connected to the water supply pipe (11), and the inlet end of the fourth branch pipe (14) is located between the chiller unit (1) and the first butterfly valve (9); the outlet end of the fourth branch pipe (14) is connected to the first outlet side A1 of the chiller unit (1). The inlet end of the fifth branch pipe (15) is connected to the water supply pipe (11), and the outlet end of the fifth branch pipe (15) is connected to the inlet end of the exhaust device (7). The inlet of the sixth branch pipe (16) is connected to the outlet of the exhaust device (7), and the outlet of the sixth branch pipe (16) is connected to the water supply pipe (11). The water supply pipeline (11) is provided with a third butterfly valve (17), the inlet end of the fifth branch pipeline (15) and the outlet end of the sixth branch pipeline (16) are located on both sides of the third butterfly valve (17), and the inlet end of the fifth branch pipeline (15) is located on the side of the water supply pipeline (11) close to the chiller unit (1).

6. A waste heat recovery system according to claim 5, wherein, The second pipeline (6) is equipped with a first water pump (18), and the first water pump (18) is located between the water inlet of the second branch pipeline (4) and the heat sink (2); The water supply pipeline (11) is equipped with a second water pump (19), and the second water pump (19) is located between the water inlet end of the fifth branch pipeline (15) and the chiller unit (1).

7. A waste heat recovery system according to claim 5, wherein The water supply pipeline (11) is equipped with a fourth butterfly valve (20), which is located between the first branch pipeline (3) and the fourth branch pipeline (14).

8. A waste heat recovery system according to claim 5, wherein, The return water pipe (12) is equipped with a fifth butterfly valve (21), which is located between the second branch pipe (4) and the third branch pipe (13).

9. A waste heat recovery system according to claim 5, wherein, The first branch pipeline (3), the second branch pipeline (4), the third branch pipeline (13), the fourth branch pipeline (14), the fifth branch pipeline (15), and the sixth branch pipeline (16) are respectively equipped with a sixth butterfly valve (22), a seventh butterfly valve (23), an eighth butterfly valve (24), a ninth butterfly valve (25), a tenth butterfly valve (26), and an eleventh butterfly valve (27).

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