Low-temperature evaporation heat pump distillation water waste heat utilization device

Abstract

This application belongs to the field of stationery manufacturing technology, specifically a low-temperature evaporative heat pump distillation water waste heat utilization device, including an evaporator, a raw liquid tank, a vacuum system, a distillation system, and a refrigerant heat pump system. The output end of the raw liquid tank is connected to the input end of the evaporator. The evaporator is equipped with a heat receiving end and a steam output end. The steam output end is connected to the distillation system through a steam pipe. The heat pump hot-side heat exchanger of the refrigerant heat pump system inputs heat from the heat receiving end into the evaporator. The outer surface of the steam pipe between the evaporator and the distillation system passes through the heat pump cold-side heat exchanger. The vacuum system is internally connected to the distillation system. A coil is provided on the side wall of the raw liquid tank, and a heat exchange tube is connected between the two ends of the coil. The outer surface between the two ends of the heat exchange tube passes through the distillation system. A raw liquid tank heat pump is provided on the raw liquid tank. This solves the problem of both not wasting the waste heat of distilled water and reducing the long preheating time in the raw liquid tank.

Description

Technical Field

[0001] This application belongs to the field of evaporation technology, specifically a low-temperature evaporation heat pump distillation water waste heat utilization device. Background Technology

[0002] The history of evaporation technology is an evolutionary history centered around three main themes: energy saving, scale prevention, and stability. From single-effect evaporation to multi-effect evaporation, the use of secondary steam generated in the preceding effect as a heat source for the subsequent effect significantly reduces the consumption of fresh steam. From multi-effect evaporation to MVR (Mechanical Vapor Reduction), steam ejectors or mechanical compressors are used to upgrade low-grade secondary steam into a high-grade heat source for recycling, further saving energy on top of multi-effect technology. From high-temperature evaporation to low-temperature evaporation, creating vacuum conditions lowers the boiling point, fundamentally solving the problems of scaling, corrosion, and thermal degradation.

[0003] Traditional multi-effect and single-effect evaporation systems offer large driving temperature differences, high heat transfer intensity, and compact equipment. However, they suffer from the following problems: 1. Long preheating time or high preheating energy consumption in low-temperature heat pump evaporation equipment; 2. Waste heat from distilled water in low-temperature evaporation equipment. Summary of the Invention

[0004] The purpose of this application is to address the shortcomings of existing technologies by setting up heat exchange tubes to preheat the raw liquid tank with the waste heat of distilled water in the distillation system, thereby solving the problems of both not wasting the waste heat of distilled water and reducing the long preheating time in the raw liquid tank.

[0005] The above-mentioned technical objective of this application is achieved through the following technical solution: A low-temperature evaporative heat pump distillation waste heat utilization device includes an evaporator, a raw liquid tank, a vacuum system, a distillation system, and a refrigerant heat pump system. The output end of the raw liquid tank is connected to the input end of the evaporator. The evaporator is provided with a heat receiving end and a steam output end. The steam output end is connected to the distillation system through a steam pipe. The heat pump hot-side heat exchanger of the refrigerant heat pump system inputs heat from the heat receiving end into the evaporator. The outer surface of the steam pipe between the evaporator and the distillation system passes through a heat pump cold-side heat exchanger. The vacuum system is internally connected to the distillation system. A coil is provided on the side wall of the raw liquid tank. A heat exchange tube is connected between the two ends of the coil. The outer surface between the two ends of the heat exchange tube passes through the distillation system. A raw liquid tank heat pump is fitted on the raw liquid tank.

[0006] Preferably, the heat receiving end includes a first circulation pump and a circulation pipe. The circulation pipe has a first end and a second end. The first end is connected to the interior of the evaporator from the bottom of the evaporator, and the second end is connected to the interior of the evaporator from the side wall of the evaporator. The first circulation pump is provided on the circulation pipe between the first end and the heat exchanger on the heat pump side. The liquid in the circulation pipe exchanges heat with the heat exchanger on the heat pump side.

[0007] Preferably, a first switching valve is provided on the input end of the evaporator.

[0008] Preferably, the portion between the two ends of the heat exchange tube is located within the distillation system for heat exchange with water vapor within the distillation system. A second circulation pump is provided between the two ends of the heat exchange tube, with the output direction of the second circulation pump facing the distillation system.

[0009] Preferably, both the output and input ends of the heat pump in the raw liquid tank are connected to the interior of the raw liquid tank.

[0010] Preferably, the output end of the heat pump in the raw liquid tank is equipped with a second switching valve.

[0011] Preferably, the output end of the raw liquid tank is connected to the interior of the evaporator through the side wall of the evaporator.

[0012] The beneficial effects of this application are: 1. This application solves the problem of both saving the waste heat of distilled water and reducing the long preheating time in the raw liquid tank by setting up heat exchange tubes to preheat the raw liquid tank with the waste heat of distilled water in the distillation system.

[0013] 2. This application has a high heat utilization rate, pure electric evaporation, no need for external cooling water and steam, low energy consumption, and stable system operation. It makes full use of the residual heat energy in the distilled water discharged from the low-temperature heat pump evaporation equipment, solves the problem of high energy consumption for preheating the raw liquid in the low-temperature heat pump evaporation equipment, and ultimately improves the overall energy efficiency of the low-temperature heat pump evaporation equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this application.

[0015] The components include: 1. Evaporator; 2. Raw material tank; 3. Vacuum system; 4. Distillation system; 5. Heat pump cold-side heat exchanger; 6. Heat pump hot-side heat exchanger; 7. Coil; 8. Heat exchange tube; 9. First circulation pump; 10. Circulation pipeline; 11. First switch valve; 12. Second circulation pump; 13. Second switch valve; 14. Steam pipeline; and 15. Raw material tank heat pump. Detailed Implementation

[0016] like Figure 1As shown, a low-temperature evaporative heat pump distillation water waste heat utilization device includes an evaporator 1, a raw liquid tank 2, a vacuum system 3, a distillation system 4, and a refrigerant heat pump system. The output end of the raw liquid tank 2 is connected to the input end of the evaporator 1. The evaporator 1 is provided with a heat receiving end and a steam output end. The steam output end is connected to the distillation system through a steam pipe 14. The heat pump hot-side heat exchanger 5 of the refrigerant heat pump system inputs heat from the heat receiving end into the evaporator 1. The outer surface of the steam pipe 14 between the evaporator 1 and the distillation system 4 passes through the heat pump cold-side heat exchanger 5. The vacuum system 3 is connected to the interior of the distillation system 4. A coil 7 is provided on the side wall of the raw liquid tank 2. A heat exchange tube 8 is connected between the two ends of the coil 7. The outer surface between the two ends of the heat exchange tube 8 passes through the distillation system 4. A raw liquid tank heat pump 15 is fitted on the raw liquid tank 2.

[0017] In this embodiment, the raw liquid tank 2 is preheated to the set temperature by the raw liquid tank heat pump 15. After entering the evaporator tank 1, the second switch valve 13 is closed, and the vacuum pump in the vacuum system 3 evacuates the evaporator tank 1. After evacuation, the refrigerant heat pump system is started, and the raw liquid in the evaporator tank 1 is heated through its hot-side heat exchanger 6. The generated secondary steam enters the cold-side heat exchanger 5 of the refrigerant heat pump system for heat exchange. The condensate after steam condensation enters the distillation water tank in the distillation system 4. The second circulation pump 12 is continuously turned on during the evaporation process, which enhances heat exchange and reduces the occurrence of coking and scaling. (2) The high-temperature distilled water in the distillation system 4 exchanges heat with the water in the coil 7 inside the raw liquid tank 2, preheating the raw liquid in the raw liquid tank 2 to the set temperature and stopping, which is equivalent to saving this part of the energy of the raw liquid heat pump 15. (3) In this system, the vacuum system 3 maintains the vacuum degree in the system, so that the raw liquid and aqueous solution can evaporate at a lower temperature, and can also pump the non-condensable gas in the device into the atmosphere.

[0018] In a preferred embodiment, the heat receiving end includes a first circulation pump 9 and a circulation pipe 10. The circulation pipe 10 has a first end and a second end. The first end communicates with the interior of the evaporator 1 from the bottom of the evaporator 1, and the second end communicates with the interior of the evaporator 1 from the side wall of the evaporator 1. The first circulation pump 9 is installed on the circulation pipe 10 between the first end and the heat pump heat exchanger 6. The liquid in the circulation pipe 10 exchanges heat with the heat pump heat exchanger 6. The first circulation pump 9 circulates the raw liquid in the raw liquid tank 2, and at the same time, the circulation pipe 10 passes through the heat pump heat exchanger 6, thereby absorbing heat from the evaporator 1.

[0019] As a preferred embodiment, a first switching valve 11 is provided at the input end of the evaporator 1. The evaporator 1 is opened and closed by the first switching valve 11.

[0020] In a preferred embodiment, the portion between the two ends of the heat exchange tube 8 is located within the distillation system 4 for heat exchange with the water vapor within the distillation system 4. A second circulation pump 12 is provided between the two ends of the heat exchange tube 8, with the output direction of the second circulation pump 12 facing the distillation system 4. With this configuration, the liquid in the heat exchange tube 18 exchanges heat with the distilled water and then flows into the coil 7 to preheat the raw material tank 2.

[0021] As a preferred embodiment, both the output and input terminals of the raw material tank heat pump 15 are connected to the interior of the raw material tank 2. This allows the raw material tank heat pump 15 to heat the raw material tank 2.

[0022] As a preferred embodiment, the output end of the raw material tank heat pump 15 is equipped with a second switching valve 13. This enables the raw material tank heat pump 15 to be turned on and off.

[0023] As a preferred embodiment, the output end of the raw liquid tank 2 is connected to the interior of the evaporator 1 through the side wall of the evaporator 1. This ensures that the liquid flowing from the raw liquid tank 2 into the evaporator 1 flows through the middle of the evaporator 1, facilitating evaporation.

Claims

1. A low-temperature evaporative heat pump distilled water waste heat recovery device, characterized in that, The system includes an evaporator (1), a raw liquid tank (2), a vacuum system (3), a distillation system (4), and a refrigerant heat pump system. The output end of the raw liquid tank (2) is connected to the input end of the evaporator (1). The evaporator (1) is provided with a heat receiving end and a steam output end. The steam output end is connected to the distillation system through a steam pipe (14). The heat pump heat exchanger (5) of the refrigerant heat pump system inputs heat from the heat receiving end into the evaporator (1). The outer surface of the steam pipe (14) between the evaporator (1) and the distillation system (4) passes through the heat pump cold side heat exchanger (5). The vacuum system (3) is connected to the interior of the distillation system (4). The side wall of the raw liquid tank (2) is provided with a coil (7). A heat exchange tube (8) is connected between the two ends of the coil (7). The outer surface between the two ends of the heat exchange tube (8) passes through the distillation system (4). The raw liquid tank (2) is equipped with a raw liquid tank heat pump (15).

2. The low-temperature evaporative heat pump distilled water waste heat utilization device according to claim 1, characterized in that: The heat receiving end includes a first circulation pump (9) and a circulation pipe (10). The circulation pipe (10) has a first end and a second end. The first end is connected to the inside of the evaporator (1) from the bottom of the evaporator (1), and the second end is connected to the inside of the evaporator (1) from the side wall of the evaporator (1). The first circulation pump (9) is provided on the circulation pipe (10) between the first end and the heat pump heat exchanger (6). The liquid in the circulation pipe (10) exchanges heat with the heat pump heat exchanger (6).

3. The low-temperature evaporative heat pump distilled water waste heat utilization device according to claim 1, characterized in that: The evaporator (1) is equipped with a first switching valve (11) at its input end.

4. The low-temperature evaporative heat pump distilled water waste heat utilization device according to claim 1, characterized in that: The portion between the two ends of the heat exchange tube (8) is located within the distillation system (4) for heat exchange with the water vapor in the distillation system (4). A second circulation pump (12) is provided between the two ends of the heat exchange tube (8), and the output direction of the second circulation pump (12) is towards the distillation system (4).

5. The low-temperature evaporative heat pump distilled water waste heat utilization device according to claim 1, characterized in that: The output and input ends of the heat pump (15) of the raw liquid tank are both connected to the interior of the raw liquid tank (2).

6. The low-temperature evaporative heat pump distilled water waste heat utilization device according to claim 5, characterized in that: The output end of the raw liquid tank heat pump (15) is equipped with a second switching valve (13).

7. The low-temperature evaporative heat pump distilled water waste heat utilization device according to claim 1, characterized in that: The output end of the raw liquid tank (2) is connected to the interior of the evaporator (1) through the side wall of the evaporator (1).

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