A high-temperature steam heat pump system based on waste water heat recovery

Abstract

The utility model discloses a kind of high-temperature steam heat pump systems based on waste water waste heat recovery, including waste heat tank, first heat exchange component, second heat exchange component and third heat exchange component, first heat exchange component includes first heat exchanger, first heat pump unit and first flash tank, the outlet pipe of waste heat tank is connected with first heat exchanger, waste water carrying waste heat enters first heat exchanger and exchanges heat with circulating water, second heat exchange component includes second heat exchanger, second heat pump unit and second flash tank, the outlet pipe of second heat exchanger is connected with first heat exchanger, waste water carrying waste heat enters second heat exchanger and exchanges heat with circulating water, third heat exchange component is used to heat first water supply pump and the supplementary cold water delivered by second water supply pump;Waste water carrying waste heat exchanges heat by first heat exchanger, second heat exchanger, third heat exchanger and fourth heat exchanger, waste heat is fully released by cascade utilization, it is favorable to reduce waste heat temperature, with the advantages of high waste heat utilization degree, low comprehensive energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of steam production technology, specifically a high-temperature steam heat pump system based on wastewater waste heat recovery. Background Technology

[0002] With the rapid development of my country's industry, the demand for steam is constantly increasing. In particular, against the backdrop of the dual carbon targets and energy shortages in recent years, the price of steam remains high. Therefore, the production of steam by recovering waste heat has become a focus of attention.

[0003] With the development of industrial technology, new waste heat recovery technologies are constantly breaking through. Among them, high-temperature heat pump technology is widely favored by the industry due to its energy-saving and high-efficiency characteristics. By coupling a steam compressor, higher temperature and higher pressure steam can be obtained to meet different production needs. Numerous studies have shown that it is efficient and feasible to recover and utilize waste heat through heat pump technology. However, existing waste heat recovery steam production technologies still have the problem of insufficient waste heat utilization, and the efficiency of waste heat utilization needs to be improved. To this end, this utility model proposes a high-temperature steam heat pump system based on wastewater waste heat recovery that can solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a high-temperature steam heat pump system based on wastewater waste heat recovery to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature steam heat pump system based on wastewater waste heat recovery, comprising a waste heat box, a first heat exchange component, a second heat exchange component, and a third heat exchange component. The first heat exchange component includes a first heat exchanger, a first heat pump unit, and a first flash tank. The outlet pipe of the waste heat box is connected to the first heat exchanger. Wastewater carrying waste heat enters the first heat exchanger to exchange heat with circulating water. The first heat pump unit uses circulating water as a heat source to produce high-temperature hot water and delivers it to the first flash tank. The liquid pipe of the first flash tank is connected to a first makeup water pump. The unvaporized water discharged from the liquid pipe of the first flash tank is mixed with the makeup cold water delivered by the first makeup water pump and then enters the first heat pump unit.

[0006] The second heat exchange component includes a second heat exchanger, a second heat pump unit, and a second flash tank. The second heat exchanger is connected to the outlet pipe of the first heat exchanger. Wastewater carrying residual heat enters the second heat exchanger to exchange heat with circulating water. The second heat pump unit uses circulating water as a heat source to produce high-temperature hot water and delivers it to the second flash tank. The liquid pipe of the second flash tank is connected to a second makeup water pump. The unvaporized water discharged from the liquid pipe of the second flash tank is mixed with the makeup cold water delivered by the second makeup water pump and then enters the second heat pump unit.

[0007] The third heat exchange component is used to heat the cold water supplied by the first and second water pumps.

[0008] Preferably, the steam pipe of the first flash tank is connected to a first steam buffer tank, and the steam pipe of the second flash tank is connected to a second steam buffer tank.

[0009] Preferably, the second steam buffer tank is connected to a steam compressor.

[0010] Preferably, a water supply pump is installed on the outlet pipe of the waste heat box.

[0011] Preferably, the third heat exchange assembly includes a third heat exchanger and a fourth heat exchanger. The third heat exchanger is located between the liquid pipe of the second water supply pump and the second flash tank, and the fourth heat exchanger is located between the liquid pipe of the first water supply pump and the first flash tank. The third heat exchanger and the fourth heat exchanger are respectively connected to the outlet pipe of the second heat exchanger.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] Waste heat is fully released through cascade utilization, which helps to reduce the temperature of waste heat and has the advantages of high waste heat utilization and low overall energy consumption.

[0014] The first heat pump unit and the first heat pump unit can produce hot water at different temperatures to produce steam at different temperatures, meeting different process requirements. Through indirect heat exchange design, the damage of waste heat impurities and corrosive substances to the first heat pump unit and the first heat pump unit can be reduced, ensuring the safe operation of the heat pump system.

[0015] Using waste heat to heat and replenish cold water reduces heat loss and increases steam production. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the first heat pump unit and the structure of the first heat pump unit of this utility model;

[0018] In the diagram: 1. First heat exchanger; 2. Second heat exchanger; 3. Third heat exchanger; 4. Fourth heat exchanger; 5. First heat pump unit; 6. Second heat pump unit; 7. First flash tank; 8. Second flash tank; 9. Waste heat tank; 10. Water supply pump; 11. First makeup water pump; 12. Second makeup water pump; 13. Steam compressor; 14. First steam buffer tank; 15. Second steam buffer tank; 16. Evaporator; 17. Compressor; 18. Condenser; 19. Electronic expansion valve. Detailed Implementation

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

[0020] Please see Figure 1-2

[0021] A high-temperature steam heat pump system based on wastewater waste heat recovery is provided:

[0022] The first heat exchange assembly includes a first heat exchanger 1, a first heat pump unit 5, and a first flash tank 7. The outlet pipe of the waste heat box 9 is connected to the first heat exchanger 1. Wastewater carrying waste heat enters the first heat exchanger 1 to exchange heat with circulating water. The first heat pump unit 5 uses circulating water as a heat source to produce high-temperature hot water and delivers it to the first flash tank 7.

[0023] A water supply pump 10 is installed on the outlet pipe of the waste heat box 9. The waste water carrying the waste heat enters the first heat exchanger 1 from the waste heat box 9 and exchanges heat with the circulating water. The first heat pump unit 5 uses the circulating water after heat exchange as a heat source to produce high-temperature hot water. The high-temperature hot water is transported to the first flash tank 7 and rapidly boils and vaporizes in the first flash tank 7 to achieve vapor-liquid two-phase separation. The steam enters the steam pipe from the top of the first flash tank 7, and the unvaporized water enters the liquid pipe from the bottom of the first flash tank 7.

[0024] The liquid pipe of the first flash tank 7 is connected to the first makeup water pump 11. The unvaporized water discharged from the liquid pipe of the first flash tank 7 is mixed with the makeup cold water delivered by the first makeup water pump 11 and then enters the first heat pump unit 5. The unvaporized water is discharged and mixed with the makeup cold water and then supplied to the first heat pump unit 5 to realize the continuous production of steam.

[0025] The second heat exchange assembly includes a second heat exchanger 2, a second heat pump unit 6, and a second flash tank 8. The second heat exchanger 2 is connected to the outlet pipe of the first heat exchanger 1. Wastewater carrying residual heat enters the second heat exchanger 2 to exchange heat with the circulating water. The second heat pump unit 6 uses the circulating water as a heat source to produce high-temperature hot water and delivers it to the second flash tank 8.

[0026] Wastewater carrying residual heat enters the second heat exchanger from the first heat exchanger 1 and exchanges heat with the circulating water. The second heat pump unit 6 uses the circulating water after heat exchange as a heat source to produce high-temperature hot water. The high-temperature hot water is transported to the second flash tank 8 and rapidly boils and vaporizes in the second flash tank 8 to achieve vapor-liquid two-phase separation. Steam enters the steam pipe from the top of the second flash tank 8, and unvaporized water enters the liquid pipe from the bottom of the second flash tank 8.

[0027] The liquid pipe of the second flash tank 8 is connected to the second makeup water pump 12. The unvaporized water discharged from the liquid pipe of the second flash tank 8 is mixed with the makeup cold water delivered by the second makeup water pump 12 and then enters the second heat pump unit 6. The unvaporized water is discharged and mixed with the makeup cold water and then supplied to the second heat pump unit 6 to realize the continuous production of steam.

[0028] The third heat exchange assembly is used to heat the cold water supplied by the first water supply pump 11 and the second water supply pump 12. The third heat exchange assembly includes a third heat exchanger 3 and a fourth heat exchanger 4. The third heat exchanger 3 is located between the liquid pipes of the second water supply pump 12 and the second flash tank 8, and the fourth heat exchanger 4 is located between the liquid pipes of the first water supply pump 11 and the first flash tank 7. The third heat exchanger 3 and the fourth heat exchanger 4 are respectively connected to the outlet pipe of the second heat exchanger 2.

[0029] Wastewater carrying residual heat enters the third heat exchanger 3 and the fourth heat exchanger 4 from the second heat exchanger 2 and then exchanges heat with the circulating water. The circulating water after heat exchange heats the cold water supplied by the first water supply pump 11 and the second water supply pump 12, heating the cold water to medium temperature.

[0030] The steam pipe of the first flash tank 7 is connected to the first steam buffer tank 14, and the steam pipe of the second flash tank 8 is connected to the second steam buffer tank 15. The steam generated by the first flash tank 7 and the second flash tank 8 enters the first steam buffer tank 14 and the second steam buffer tank 15 respectively. The second steam buffer tank 15 is connected to a steam compressor 13, so that the steam becomes high-temperature steam after passing through the steam compressor 13.

[0031] The first steam buffer tank 14 is connected to a low-pressure steam pipe, the steam compressor 13 is connected to a high-pressure steam pipe, the low-pressure steam pipe has a low-pressure steam valve, and the high-pressure steam pipe is equipped with a high-pressure steam valve.

[0032] Both the first heat pump unit 5 and the second heat pump unit 6 include an evaporator 16, a compressor 17, a condenser 18, and an electronic expansion valve 19. The first heat exchanger 1 is connected to the evaporator 16 in the first heat pump unit 5, the second heat exchanger 2 is connected to the evaporator 16 in the second heat pump unit 6, the first flash tank 7 is connected to the condenser 18 in the first heat pump unit 5, and the second flash tank 8 is connected to the condenser 18 in the second heat pump unit 6.

[0033] Wastewater carrying residual heat exchanges heat through the first heat exchanger 1, the second heat exchanger 2, the third heat exchanger 3, and the fourth heat exchanger 4. The residual heat is fully released through cascade utilization, which helps to reduce the temperature of the residual heat. It has the advantages of high utilization of residual heat and low overall energy consumption.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature steam heat pump system based on waste water heat recovery, characterized by, The system includes a waste heat tank (9), a first heat exchange component, a second heat exchange component, and a third heat exchange component. The first heat exchange component includes a first heat exchanger (1), a first heat pump unit (5), and a first flash tank (7). The outlet pipe of the waste heat tank (9) is connected to the first heat exchanger (1). Wastewater carrying waste heat enters the first heat exchanger (1) to exchange heat with circulating water. The first heat pump unit (5) uses circulating water as a heat source to produce high-temperature hot water and delivers it to the first flash tank (7). The liquid pipe of the first flash tank (7) is connected to a first makeup water pump (11). The unvaporized water discharged from the liquid pipe of the first flash tank (7) is mixed with the makeup cold water delivered by the first makeup water pump (11) and then enters the first heat pump unit (5). The second heat exchange component includes a second heat exchanger (2), a second heat pump unit (6), and a second flash tank (8). The second heat exchanger (2) is connected to the outlet pipe of the first heat exchanger (1). Wastewater carrying residual heat enters the second heat exchanger (2) to exchange heat with circulating water. The second heat pump unit (6) uses circulating water as a heat source to produce high-temperature hot water and delivers it to the second flash tank (8). The liquid pipe of the second flash tank (8) is connected to a second makeup water pump (12). The unvaporized water discharged from the liquid pipe of the second flash tank (8) is mixed with the makeup cold water delivered by the second makeup water pump (12) and then enters the second heat pump unit (6). The third heat exchange component is used to heat the replenished cold water delivered by the first replenishment pump (11) and the second replenishment pump (12).

2. The high-temperature steam heat pump system based on waste water heat recovery according to claim 1, characterized in that, The steam pipe of the first flash tank (7) is connected to the first steam buffer tank (14), and the steam pipe of the second flash tank (8) is connected to the second steam buffer tank (15).

3. The high-temperature steam heat pump system based on waste water heat recovery according to claim 2, characterized in that, The second steam buffer tank (15) is connected to a steam compressor (13).

4. The high-temperature steam heat pump system based on waste water heat recovery according to claim 1, characterized in that, A water supply pump (10) is installed on the outlet pipe of the waste heat box (9).

5. The high-temperature steam heat pump system based on waste water heat recovery according to claim 1, characterized in that, The third heat exchange assembly includes a third heat exchanger (3) and a fourth heat exchanger (4). The third heat exchanger (3) is located between the liquid pipe of the second water supply pump (12) and the second flash tank (8), and the fourth heat exchanger (4) is located between the liquid pipe of the first water supply pump (11) and the first flash tank (7). The third heat exchanger (3) and the fourth heat exchanger (4) are respectively connected to the outlet pipe of the second heat exchanger (2).

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