Comprehensive utilization system and method for recycling waste heat in mixed mode through heat pump unit

Abstract

The invention discloses a comprehensive utilization system and method for mixed recovery of waste heat through a heat pump unit, and relates to the technical field of heat pump unit waste heat recovery. Comprising a low-grade heat energy heat pump unit, and the low-grade heat energy heat pump unit comprises a first evaporator, a first compressor and a first condenser; the first compressor is communicated with the first condenser and is used for conveying gas compressed into high temperature and high pressure to the first condenser, so that a refrigerant is cooled and condensed in the first condenser to supply heat; the high-grade heat energy heat pump unit comprises a second evaporator, a second compressor and a second condenser, and the second evaporator is communicated with the second compressor and used for conveying the refrigerant which absorbs heat and evaporates to the second compressor to be compressed; and the second compressor is communicated with the second condenser and is used for conveying the compressed high-temperature and high-pressure gas to the second condenser.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology of heat pump units, and in particular to a comprehensive utilization system and method for waste heat recovery using heat pump units. Background Technology

[0002] A heat pump unit is a device that transfers heat energy from a low-temperature heat source to a high-temperature heat source to achieve cooling and heating. The low-temperature heat source typically used in heat pump units is the medium around us—air, river water, seawater, municipal sewage, surface water, groundwater, greywater, fire-fighting water tanks, or working fluid discharged from industrial production equipment. These working fluids often have a temperature close to that of the surrounding medium. Key components include an evaporator, compressor, and condenser, which work together to "upgrade" low-grade waste heat into usable heat energy.

[0003] Currently, heat pump units primarily recover waste heat for heating purposes using low-grade waste heat. However, in industrial applications, using it only for heating is wasteful. Furthermore, the working fluid discharged from the equipment, after recovery, only reaches 30℃-80℃, offering minimal benefit to industrial production. It is necessary to upgrade this low-grade heat energy to high-grade heat energy before reuse. Additionally, while industrial waste gas and wastewater carry waste heat, they also contain particulate matter. Their entry into the heat pump unit will affect its operation and heat exchange efficiency. Moreover, the varying temperatures of the working fluid discharged from industrial equipment can easily lead to temperature neutralization during waste heat recovery, preventing the achievement of higher recovery temperatures and thus wasting energy. To achieve more efficient recovery and utilization of preheated heat, this issue needs to be addressed.

[0004] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop a comprehensive utilization system and method for recovering waste heat using heat pump units. Summary of the Invention

[0005] The purpose of this invention is to provide a comprehensive utilization system and method for recovering waste heat by using a heat pump unit to solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a comprehensive utilization system for waste heat recovery using a heat pump unit, comprising: A low-grade heat pump unit includes a first evaporator, a first compressor, and a first condenser. The first evaporator is connected to the first compressor to deliver heat-absorbing and evaporating refrigerant to the first compressor for compression. The first compressor is connected to the first condenser to deliver gas compressed into high temperature and high pressure to the first condenser, so that the refrigerant dissipates heat and condenses in the first condenser for heating. A high-grade heat pump unit includes a second evaporator, a second compressor, and a second condenser. The second evaporator is connected to the second compressor to deliver heat-absorbing and evaporating refrigerant to the second compressor for compression. The second compressor is connected to the second condenser to deliver gas compressed into high temperature and high pressure to the second condenser, so that the refrigerant dissipates heat and condenses in the second condenser for heating. A heat energy quality enhancement pipeline is installed between the first condenser and the second evaporator to transport the high-temperature heat energy generated by the condensation and heat dissipation of the first condenser to the second evaporator as a high-temperature heat source for the second evaporator. And a water vapor heat separation tower, which is used to filter high-temperature flue gas and disperse the heat energy carried by the high-temperature flue gas into filtered high-temperature gas and high-temperature water as a high-temperature heat source for the first evaporator or the second evaporator.

[0007] Furthermore, a first return pipe is provided between the first condenser and the first evaporator, and a first expansion valve is provided on the first return pipe.

[0008] Furthermore, a second return pipe is provided between the second condenser and the second evaporator, and a second expansion valve is provided on the second return pipe.

[0009] Furthermore, the water vapor heat separation tower includes: A separation tower body, the bottom of which is used to collect water; A high-temperature flue gas duct, which is connected to the lower end of the separation tower body; A room temperature water spray pipe is connected to the upper end of the separation tower body. The room temperature water spray pipe is equipped with spray heads for spraying room temperature water downwards to remove dust and heat from the high temperature flue gas. A high-temperature gas transport main pipeline is connected to the top of the separation tower. A first secondary pipeline is connected between the high-temperature gas transport main pipeline and the first evaporator. A first solenoid valve is installed on the first secondary pipeline. A second secondary pipeline is connected between the high-temperature gas transport main pipeline and the second evaporator. A second solenoid valve is installed on the second secondary pipeline. A high-temperature liquid transport main pipeline is connected to the bottom of the separation tower. A third auxiliary pipeline is connected between the high-temperature liquid transport main pipeline and the first evaporator. A third solenoid valve is installed on the third auxiliary pipeline. A fourth auxiliary pipeline is connected between the high-temperature gas transport main pipeline and the second evaporator. A fourth solenoid valve is installed on the fourth auxiliary pipeline.

[0010] Furthermore, a first temperature sensor is installed on the main high-temperature gas transport pipeline at the front end of the first and second auxiliary pipelines, and a second temperature sensor is installed on the main high-temperature liquid transport pipeline at the front end of the third and fourth auxiliary pipelines.

[0011] Furthermore, a water filter is installed on the main high-temperature liquid transport pipeline at the front end of the third and fourth auxiliary pipelines.

[0012] Furthermore, a high-temperature wastewater spray pipe is connected to the upper end of the separation tower body, located above the high-temperature flue gas pipe, and the high-temperature wastewater spray pipe has spray heads for spraying high-temperature wastewater downwards.

[0013] Furthermore, a water pipe is connected to the lower end of the separation tower body, located below the high-temperature flue gas duct, and the water pipe is used to transport water other than wastewater into the separation tower body.

[0014] Furthermore, a fifth solenoid valve is installed on the heat energy quality improvement pipeline.

[0015] A method for utilizing a comprehensive utilization system that combines waste heat recovery using a heat pump unit, characterized by comprising the following steps: Step 1: Prepare at least two sets of heat pump units and use them to recover low-grade heat sources and high-grade heat sources respectively; Step 2: Prepare the heat source recovery end, namely the water vapor heat separation tower, so as to be able to recover the heat energy of high-temperature flue gas and the heat energy of high-temperature water. Step 3: After the high-temperature flue gas recovered by the water vapor heat separation tower in Step 2 is filtered by spraying with lukewarm or high-temperature water, the filtered high-temperature flue gas flows upward and is transported to a low-grade heat pump unit or a high-grade heat pump unit for use. At the same time, the water carrying heat from the filtered high-temperature flue gas is also transported to a low-grade heat pump unit or a high-grade heat pump unit for use. Step 4: The heat energy of the high-temperature flue gas and high-temperature water in the water vapor heat separation tower is separated into low-grade heat energy and high-grade heat energy according to the temperature, so that they can be used by low-grade heat energy heat pump units and high-grade heat energy heat pump units respectively. Step 5: The heat energy generated by the second condenser in the low-grade heat pump unit recovering waste heat is directly transported through the heat energy grade improvement pipeline to the second evaporator in the high-grade heat pump unit to upgrade the low-grade waste heat to high-grade waste heat.

[0016] The comprehensive utilization system and method for recovering waste heat using a heat pump unit, as described above, has the following beneficial effects: This device is equipped with separate low-grade and high-grade heat pump units to separate low-grade and high-grade heat energy based on temperature. This ensures that the heat energy flows to the respective units, avoiding temperature neutralization and the inability to reach the required recovery temperature, thus preventing energy waste and improving heat recovery efficiency. Simultaneously, the system first extracts some heat using the low-grade heat pump unit, then uses the high-grade heat pump unit to further increase the temperature, ultimately outputting high-temperature hot water or steam, further enhancing the utilization value of the recovered heat energy. Furthermore, the water-vapor heat separation tower filters the high-temperature flue gas while simultaneously transporting heat-carrying water to either the low-grade or high-grade heat pump units, preventing contamination of the heat pump units and avoiding heat energy waste caused by filtering high-temperature flue gas. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the integrated utilization system and method for recovering waste heat using a heat pump unit, as provided in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. First evaporator; 2. First compressor; 3. First condenser; 4. Second evaporator; 5. Second compressor; 6. Second condenser; 7. Heat energy grade enhancement pipeline; 8. First reflux pipeline; 9. First expansion valve; 10. Second reflux pipeline; 11. Second expansion valve; 12. Separation tower body; 13. High-temperature flue gas pipeline; 14. Normal temperature water spray pipeline; 15. High-temperature gas conveying main pipeline; 16. First auxiliary pipeline; 17. First solenoid valve; 18. Second auxiliary pipeline; 19. Second solenoid valve; 20. High-temperature liquid conveying main pipeline; 21. Third auxiliary pipeline; 22. Third solenoid valve; 23. Fourth auxiliary pipeline; 24. Fourth solenoid valve; 25. First temperature sensor; 26. Second temperature sensor; 27. Water filter; 28. High-temperature wastewater spray pipeline; 29. ​​Water pipe; 30. Fifth solenoid valve. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Please see Figure 1 A comprehensive utilization system that uses heat pump units to recover waste heat includes: The low-grade heat pump unit includes a first evaporator 1, a first compressor 2, and a first condenser 3. The first evaporator 1 is connected to the first compressor 2 to deliver heat-absorbing and evaporating refrigerant to the first compressor 2 for compression. The first compressor 2 is connected to the first condenser 3 to deliver gas compressed into high temperature and high pressure to the first condenser 3 so that the refrigerant dissipates heat and condenses in the first condenser 3 for heating. The high-grade heat pump unit includes a second evaporator 4, a second compressor 5, and a second condenser 6. The second evaporator 4 is connected to the second compressor 5 to deliver the heat-absorbing and evaporating refrigerant to the second compressor 5 for compression. The second compressor 5 is connected to the second condenser 6 to deliver the gas compressed into a high temperature and high pressure to the second condenser 6, so that the refrigerant dissipates heat and condenses in the second condenser 6 for heating. The heat energy level enhancement pipe 7 is installed between the first condenser 3 and the second evaporator 4 to transport the high-temperature heat energy generated by the condensation and heat dissipation of the first condenser 3 to the second evaporator 4 as a high-temperature heat source for the second evaporator 4. And a water vapor heat separation tower, which is used to filter high-temperature flue gas and disperse the heat energy carried by the high-temperature flue gas into filtered high-temperature gas and high-temperature water as a high-temperature heat source for the first evaporator 1 or the second evaporator 4.

[0022] First, conventional waste heat recovery is achieved using existing technologies for the evaporator, compressor, and condenser of the heat pump unit. This is done by dividing the unit into two groups: a low-grade heat pump unit and a high-grade heat pump unit, to recover heat energy of different grades and improve heat recovery efficiency. This avoids temperature neutralization and the inability to reach higher recovery temperatures, prevents energy waste, and improves heat recovery efficiency. Simultaneously, a heat energy grade enhancement pipe 7 is used to transfer the high-temperature heat energy generated by the condensation and heat dissipation of the first condenser 3 to the second evaporator 4 as a high-temperature heat source, further increasing the temperature and ultimately outputting high-temperature hot water or steam for higher-value utilization, such as equipment preheating or heating in industrial production, thus enhancing the utilization value of the recovered heat energy. This system also receives heat energy carriers such as high-temperature flue gas, high-temperature water, high-temperature wastewater, and room-temperature water through a water-vapor thermal separation tower. In particular, the received high-temperature flue gas generally contains impurities such as particulate matter. In order to prevent impurities from entering the evaporator and affecting its operation, water injected into the water-vapor thermal separation tower is used to carry away the particulate matter and other pollutants in the high-temperature flue gas, while also carrying away some heat energy. While recovering the waste heat of the filtered high-temperature gas, we also recover and reuse the water used to filter the flue gas after filtration to extract waste heat.

[0023] It should be noted that when the refrigerant absorbs heat in the evaporator, the heat source can be a mixture of liquid water and vapor. Specifically, in practical applications of mixed heat sources, in industrial evaporators (such as spray evaporators), the heat source often enters in a mixed form of "liquid water + vapor." For example, condensate is atomized and sprayed into fine droplets, simultaneously mixing with vapor, both acting as heat transfer media to transfer heat to the refrigerant. This design improves heat exchange efficiency by increasing the gas-liquid contact area. The heat transfer mechanism is as follows: liquid water absorbs heat and vaporizes through latent heat of vaporization, while vapor transfers energy through sensible heat. The refrigerant flows in the evaporator in a wet vapor state (gas-liquid mixture), absorbing heat from the mixed heat source and gradually evaporating, with the dryness (gas phase ratio) increasing from approximately 10% at the inlet to near complete vaporization.

[0024] Furthermore, a first reflux pipe 8 is provided between the first condenser 3 and the first evaporator 1. A first expansion valve 9 is provided on the first reflux pipe 8. The refrigerant condensed in the first condenser 3 is throttled and depressurized through the expansion valve via the first reflux pipe 8, turning back into a low-temperature, low-pressure liquid, and then re-enters the first evaporator 1 to form a cycle.

[0025] Furthermore, a second reflux pipe 10 is provided between the second condenser 6 and the second evaporator 4. A second expansion valve 11 is provided on the second reflux pipe 10. The refrigerant condensed in the second condenser 6 is throttled and depressurized through the expansion valve via the second reflux pipe 10, turning it back into a low-temperature, low-pressure liquid, and then re-enters the second evaporator 4 to form a cycle.

[0026] Furthermore, the water vapor heat separation tower includes: Separation tower 12, the bottom of separation tower 12 is used to collect water; High-temperature flue gas duct 13 is connected to the lower end of the separation tower body 12 to transport high-temperature flue gas to the lower end of the separation tower body 12 so that the high-temperature flue gas has space to flow upward. A room temperature water spray pipe 14 is connected to the upper end of the separation tower body 12. The room temperature water spray pipe 14 has a spray head for spraying room temperature water downwards to remove the dust and heat energy in the high temperature flue gas. The sprayed water eventually falls into the water collection area of ​​the separation tower body 12. A high-temperature gas transmission main pipeline 15 is connected to the top of the separation tower 12. A first auxiliary pipeline 16 is connected between the high-temperature gas transmission main pipeline 15 and the first evaporator 1. A first solenoid valve 17 is installed on the first auxiliary pipeline 16. A second auxiliary pipeline 18 is connected between the high-temperature gas transmission main pipeline 15 and the second evaporator 4. A second solenoid valve 19 is installed on the second auxiliary pipeline 18. The opening and closing of the first auxiliary pipeline 16 and the second auxiliary pipeline 18 are controlled by the first solenoid valve 17 and the second solenoid valve 19, respectively. After the high-temperature gas is transmitted through the high-temperature gas transmission main pipeline 15, the first auxiliary pipeline 16 or the second auxiliary pipeline 18 is selected to transmit the high-temperature gas to a low-grade heat pump unit or a high-grade heat pump unit for use as a heat source. A main high-temperature liquid transport pipeline 20 is connected to the bottom of the separation tower 12. A third auxiliary pipeline 21 connects the main high-temperature liquid transport pipeline 20 to the first evaporator 1, and a third solenoid valve 22 is installed on the third auxiliary pipeline 21. A fourth auxiliary pipeline 23 connects the main high-temperature gas transport pipeline 15 to the second evaporator 4, and a fourth solenoid valve 24 is installed on the fourth auxiliary pipeline 23. The opening and closing of the third auxiliary pipeline 21 and the fourth auxiliary pipeline 23 are controlled by the third solenoid valve 22 and the fourth solenoid valve 24, respectively. After the filtered high-temperature liquid is transported through the main high-temperature liquid transport pipeline 20, the system controls the selection of either the third auxiliary pipeline 21 or the fourth auxiliary pipeline 23 to transport the high-temperature liquid to a low-grade heat pump unit or a high-grade heat pump unit for use as a heat source.

[0027] Furthermore, a first temperature sensor 25 is installed on the high-temperature gas main pipeline 15 at the front end of the first auxiliary pipeline 16 and the second auxiliary pipeline 18, and a second temperature sensor 26 is installed on the high-temperature liquid main pipeline 20 at the front end of the third auxiliary pipeline 21 and the fourth auxiliary pipeline 23. The first temperature sensor 25 and the second temperature sensor 26 measure the temperature of the gas passing through the high-temperature gas main pipeline 15 and the temperature of the liquid passing through the high-temperature liquid main pipeline 20, respectively. Based on the temperature, the corresponding solenoid valves are opened and closed to control the supply of heat to a low-grade heat pump unit or a high-grade heat pump unit as a heat source.

[0028] Furthermore, a water filter 27 is installed on the main high-temperature liquid transport pipeline 20 at the front end of the third auxiliary pipeline 21 and the fourth auxiliary pipeline 23. The water filter 27 is used to filter out substances that carry away flue gas particles in the water. The specific selection of the water filter 27 depends on factors such as the operating environment and the type of flue gas to be received.

[0029] Furthermore, a high-temperature wastewater spray pipe 28 is connected to the upper end of the separation tower 12, above the high-temperature flue gas duct 13. The high-temperature wastewater spray pipe 28 has spray heads for spraying high-temperature wastewater downwards. This system can use gas, liquid, or a gas-liquid mixture as a heat source. The high-temperature wastewater spray pipe 28 is used to supply a liquid heat source into the separation tower 12, and can also be used as a liquid for filtering gas, or combined with room-temperature clean water to ensure the filtration effect on the flue gas. After use, it enters a low-grade or high-grade heat pump unit as a heat source.

[0030] Furthermore, a water pipe 29 is connected to the lower end of the separation tower 12, located below the high-temperature flue gas duct 13. The water pipe 29 is used to transport water other than wastewater into the separation tower 12. Other liquids that can be received and used by the evaporator, such as room temperature water, still have low-grade heat energy to be recovered and are directly transported for use through the water pipe 29.

[0031] Furthermore, a fifth solenoid valve 30 is installed on the heat energy grade improvement pipeline 7, or, as needed and for energy-saving control requirements, it is also installed as an expansion valve to control the flow rate of the heat energy grade improvement pipeline 7.

[0032] A method for utilizing a comprehensive utilization system that combines waste heat recovery using a heat pump unit, characterized by comprising the following steps: Step 1: Prepare at least two sets of heat pump units and use them to recover low-grade heat sources and high-grade heat sources respectively, so as to recover heat sources of different temperatures in stages, thereby improving heat recovery efficiency and heat conversion efficiency. Step 2: Prepare the heat source recovery end, namely the water vapor heat separation tower, so as to recover the heat energy of high temperature flue gas, the heat energy of high temperature water, or the heat energy of gas-water mixture. At the same time, it has the effect of filtering heat source and reducing the impact of heat source material on the service life of evaporator. Step 3: After the high-temperature flue gas recovered from the water-vapor heat separation tower in Step 2 is filtered by spraying with lukewarm or high-temperature water, the filtered high-temperature flue gas flows upward and is transported to a low-grade heat pump unit or a high-grade heat pump unit for use. At the same time, the water carrying heat from filtering the high-temperature flue gas is also transported to the low-grade heat pump unit or a high-grade heat pump unit for use. This allows the heat from the flue gas to be carried into the system for recovery after filtration by the water, avoiding the loss of heat energy generated during flue gas filtration and better ensuring the heat energy recovery rate. Step four involves separating the heat energy from the high-temperature flue gas and high-temperature water in the water-vapor heat separation tower into low-grade heat energy and high-grade heat energy, based on their temperatures, so that they can be used by low-grade heat energy heat pump units and high-grade heat energy heat pump units respectively. This step is carried out through the high-temperature gas transport main pipeline 15 and the high-temperature liquid transport main pipeline 20 in the water-vapor heat separation tower, and temperature sensors are used for temperature detection to divert the heat source to the low-grade heat energy heat pump unit or the high-grade heat energy heat pump unit for use as a heat source. Step 5: The heat energy generated by the second condenser 6 in the low-grade heat pump unit recovering waste heat is directly transported to the second evaporator 4 in the high-grade heat pump unit through the heat energy grade improvement pipe 7 to upgrade the low-grade waste heat to high-grade waste heat. This operation is used when high-grade heat energy is required, and the recovered heat energy is upgraded to high-temperature hot water or steam, further enhancing the utilization value of the recovered heat energy.

[0033] In summary, this device separates low-grade and high-grade heat pump units to differentiate between low-grade and high-grade heat energy based on temperature. This allows the heat energy to flow to the respective units, avoiding issues such as insufficient recovery temperature and energy waste, thus improving heat recovery efficiency. Furthermore, the system first extracts some heat using the low-grade heat pump unit, then uses the high-grade heat pump unit to further increase the temperature, ultimately outputting high-temperature hot water or steam, further enhancing the utilization value of the recovered heat energy. Additionally, the water-vapor heat separation tower filters the high-temperature flue gas while simultaneously delivering heat-carrying water to either the low-grade or high-grade heat pump unit, preventing contamination of the heat pump units and avoiding heat energy waste caused by filtering high-temperature flue gas.

[0034] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A comprehensive utilization system for recovering waste heat using a heat pump unit, characterized in that, include: A low-grade heat pump unit, comprising a first evaporator (1), a first compressor (2) and a first condenser (3), wherein the first evaporator (1) is connected to the first compressor (2) to deliver heat-absorbing and evaporating refrigerant to the first compressor (2) for compression, and the first compressor (2) is connected to the first condenser (3) to deliver gas compressed into high temperature and high pressure to the first condenser (3) so that the refrigerant dissipates heat and condenses in the first condenser (3) for heating; A high-grade heat pump unit, comprising a second evaporator (4), a second compressor (5), and a second condenser (6), wherein the second evaporator (4) is connected to the second compressor (5) to deliver heat-absorbing and evaporating refrigerant to the second compressor (5) for compression, and the second compressor (5) is connected to the second condenser (6) to deliver gas compressed into high temperature and high pressure to the second condenser (6) so that the refrigerant dissipates heat and condenses in the second condenser (6) for heating; A heat energy quality enhancement pipe (7) is provided between the first condenser (3) and the second evaporator (4) to transport the high-temperature heat energy generated by the condensation and heat dissipation of the first condenser (3) to the second evaporator (4) as a high-temperature heat source for the second evaporator (4). And a water vapor heat separation tower, which is used to filter high-temperature flue gas and disperse the heat energy carried by the high-temperature flue gas into filtered high-temperature gas and high-temperature water as a high-temperature heat source for the first evaporator (1) or the second evaporator (4).

2. The comprehensive utilization system for waste heat recovery using a heat pump unit as described in claim 1, characterized in that, A first return pipe (8) is provided between the first condenser (3) and the first evaporator (1), and a first expansion valve (9) is provided on the first return pipe (8).

3. The comprehensive utilization system for recovering waste heat using a heat pump unit as described in claim 1, characterized in that, A second return pipe (10) is provided between the second condenser (6) and the second evaporator (4), and a second expansion valve (11) is provided on the second return pipe (10).

4. The comprehensive utilization system for waste heat recovery using a heat pump unit according to claim 1, characterized in that, The water vapor heat separation tower includes: A separation tower body (12), the bottom of which is used to collect water; High-temperature flue gas duct (13), which is connected to the lower end of the separation tower body (12); A room temperature water spray pipe (14) is connected to the upper end of the separation tower body (12). The room temperature water spray pipe (14) has a spray head for spraying room temperature water downwards to remove dust and heat from the high temperature flue gas. A high-temperature gas transport main pipeline (15) is connected to the top of the separation tower (12). A first secondary pipeline (16) is connected between the high-temperature gas transport main pipeline (15) and the first evaporator (1). A first solenoid valve (17) is installed on the first secondary pipeline (16). A second secondary pipeline (18) is connected between the high-temperature gas transport main pipeline (15) and the second evaporator (4). A second solenoid valve (19) is installed on the second secondary pipeline (18). A high-temperature liquid transport main pipeline (20) is connected to the bottom of the separation tower body (12). A third auxiliary pipeline (21) is connected between the high-temperature liquid transport main pipeline (20) and the first evaporator (1). A third solenoid valve (22) is installed on the third auxiliary pipeline (21). A fourth auxiliary pipeline (23) is connected between the high-temperature gas transport main pipeline (15) and the second evaporator (4). A fourth solenoid valve (24) is installed on the fourth auxiliary pipeline (23).

5. The comprehensive utilization system for waste heat recovery using a heat pump unit according to claim 4, characterized in that, A first temperature sensor (25) is provided on the high-temperature gas main pipeline (15) at the front end of the first secondary pipeline (16) and the second secondary pipeline (18), and a second temperature sensor (26) is provided on the high-temperature liquid main pipeline (20) at the front end of the third secondary pipeline (21) and the fourth secondary pipeline (23).

6. The comprehensive utilization system for waste heat recovery using a heat pump unit according to claim 4, characterized in that, A water filter (27) is installed on the main high-temperature liquid transport pipeline (20) at the front end of the third auxiliary pipeline (21) and the fourth auxiliary pipeline (23).

7. The comprehensive utilization system for waste heat recovery using a heat pump unit according to claim 4, characterized in that, The upper end of the separation tower (12) is connected to a high-temperature wastewater spray pipe (28) located above the high-temperature flue gas pipe (13). The high-temperature wastewater spray pipe (28) has spray heads for spraying high-temperature wastewater downwards.

8. The comprehensive utilization system for waste heat recovery using a heat pump unit according to claim 4, characterized in that, A water pipe (29) is connected to the lower end of the separation tower (12) below the high-temperature flue gas pipe (13). The water pipe (29) is used to transport water other than wastewater into the separation tower (12).

9. The comprehensive utilization system for waste heat recovery using a heat pump unit according to claim 1, characterized in that, The heat energy quality improvement pipeline (7) is equipped with a fifth solenoid valve (30).

10. The utilization method of the comprehensive utilization system for waste heat recovery using a heat pump unit according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Prepare at least two sets of heat pump units and use them to recover low-grade heat sources and high-grade heat sources respectively; Step 2: Prepare the heat source recovery end, namely the water vapor heat separation tower, so as to be able to recover the heat energy of high-temperature flue gas and the heat energy of high-temperature water. Step 3: After the high-temperature flue gas recovered by the water vapor heat separation tower in Step 2 is filtered by spraying with lukewarm or high-temperature water, the filtered high-temperature flue gas flows upward and is transported to a low-grade heat pump unit or a high-grade heat pump unit for use. At the same time, the water carrying heat from the filtered high-temperature flue gas is also transported to a low-grade heat pump unit or a high-grade heat pump unit for use. Step 4: The heat energy of the high-temperature flue gas and high-temperature water in the water vapor heat separation tower is separated into low-grade heat energy and high-grade heat energy according to the temperature, so that they can be used by low-grade heat energy heat pump units and high-grade heat energy heat pump units respectively. Step 5: The heat energy generated by the second condenser (6) in the low-grade heat pump unit recovering waste heat is directly transported through the heat energy grade improvement pipe (7) to the second evaporator (4) in the high-grade heat pump unit to upgrade the low-grade waste heat to high-grade waste heat.

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