Coupling system for high-temperature heat pump and waste heat recovery

Abstract

The invention discloses a high-temperature heat pump and waste heat recovery coupling system. The high-temperature heat pump and waste heat recovery coupling system comprises a control module, a high-temperature heat pump module, an output module and a waste heat recovery module. The high-temperature heat pump module exchanges heat with the output module; the output module exchanges heat with the high-temperature heat pump through the waste heat recovery module; the high-temperature heat pump module comprises a low-temperature unit and a high-temperature unit. The output end of the low-temperature unit exchanges heat with the input end of the high-temperature unit. The output end of the high-temperature unit is connected with the input end of the output module through a pipeline; the waste heat recovery module comprises a first plate heat exchanger and a second plate heat exchanger; the first plate heat exchanger is arranged between the output end of the low-temperature unit and the input end of the low-temperature unit, and the second plate heat exchanger is arranged between the output end of the output module and the output end of the high-temperature unit. The high-temperature heat pump and waste heat recovery coupling system greatly reduces the temperature rise requirement of the high-temperature heat pump through deep cascade waste heat utilization.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump waste heat recovery systems, in particular to a high-temperature heat pump and waste heat recovery coupling system. BACKGROUND

[0002] A high-temperature heat pump is a device that can raise low-grade heat energy (such as industrial waste heat and environmental heat sources) to medium-high temperature by inputting a small amount of high-grade energy (such as electricity). Its core principle is based on the reverse Carnot cycle, which realizes the upgrading of heat energy grade through the phase change and compression process of the working medium.

[0003] A Chinese patent with application number 202411896650.9 discloses a cascade high-temperature heat pump system, which includes a primary heat pump system and a secondary heat pump system. The primary heat pump system is provided with a primary output pipe and a primary input pipe. The cascade high-temperature heat pump system can only use the primary output pipe and the primary input pipe of the primary heat pump system to input and output the medium that needs to be heated when high temperature is not needed. When high temperature is needed, the medium can be heated by the primary heat pump system, then flow to the secondary input pipe through the primary output pipe and the first adjusting guide pipe, and then enter the secondary heat pump system for secondary heating to achieve the required high temperature. The primary heat pump system and the secondary heat pump system can be closed by the first control valve and the second control valve to form two independent individuals, so that various individual work does not affect each other, and the system can be used individually or simultaneously to maximize the utilization of resources.

[0004] A Chinese patent with application number 202111136843.0 discloses a high-temperature dual-source heat pump device, which includes a compressor having a high-pressure exhaust port, a low-pressure suction port, and a medium-pressure suction port. The high-pressure exhaust port is connected with the refrigerant pipeline inlet of a condenser. The condenser has a refrigerant pipeline and a water pipeline. The regenerator has a high-pressure refrigerant pipeline and a low-pressure refrigerant pipeline. The inlet of the high-pressure refrigerant pipeline of the regenerator is connected with the outlet of the refrigerant pipeline of the condenser, which is used to cool the high-pressure saturated liquid refrigerant into high-pressure supercooled liquid refrigerant. The water inlet of a hot water storage tank is connected with the water pipeline outlet of the condenser, which is used to receive the heated high-temperature hot water. The device adopts the cascade heat absorption and cascade compression cycle mode of the heat recovery type evaporator and the air cooling type evaporator to solve the problems of low compressor volume efficiency and high exhaust temperature under high pressure ratio in the prior art.

[0005] However, in the above-mentioned high-temperature heat pump system, there is a lack of waste heat recovery system to recover the waste heat generated in the production process and preheat the process water, resulting in energy waste. That is, the energy utilization rate of the existing high-temperature heat pump system still has room for improvement. SUMMARY

[0006] Based on this, it is necessary to provide a high-temperature heat pump and waste heat recovery coupling system for the technical problem of insufficient energy utilization rate of the existing high-temperature heat pump system.

[0007] A high-temperature heat pump and waste heat recovery coupling system, comprising a control module, a high-temperature heat pump module, an output module, and a waste heat recovery module; the output end of the high-temperature heat pump module is in heat exchange with the input end of the output module; the output end of the output module is in heat exchange with the input end of the high-temperature heat pump through the waste heat recovery module, thereby forming a coupling structure between the high-temperature heat pump module and the waste heat recovery module, wherein the output module outputs heat energy to the outside of the system; the control end of the control module is connected with the high-temperature heat pump module, the output module, and the waste heat recovery module, thereby realizing intelligent control of the control module on the high-temperature heat pump module, the output module, and the waste heat recovery module.

[0008] The high-temperature heat pump module comprises a low-temperature unit and a high-temperature unit, the low-temperature unit and the high-temperature unit form independent working medium circulation structures respectively, and the output end of the low-temperature unit is in heat exchange with the input end of the high-temperature unit; the output end of the high-temperature unit is connected with the input end of the output module by a pipeline; at the same time, the waste heat recovery module comprises a first plate heat exchanger and a second plate heat exchanger; the first plate heat exchanger is arranged between the output end of the low-temperature unit and the input end of the low-temperature unit, and the second plate heat exchanger is arranged between the output end of the output module and the output end of the high-temperature unit.

[0009] In one embodiment, the low-temperature unit comprises a first evaporator, a first low-pressure compressor, a first high-pressure compressor, and a first condenser; the input end of the first evaporator is connected with the output end of the first condenser by a first plate heat exchanger; the output end of the first evaporator, the first low-pressure compressor, the first high-pressure compressor, and the first condenser are sequentially connected by pipelines, the first condenser is in heat exchange with the input end of the high-temperature unit, thereby forming a low-temperature stage compression system.

[0010] In one embodiment, the low-temperature unit further comprises a first intermediate cooler, the first intermediate cooler is arranged between the first low-pressure compressor and the first high-pressure compressor, and the first low-pressure compressor, the first intermediate cooler, and the first high-pressure compressor are sequentially connected by pipelines.

[0011] In one embodiment, the first evaporator is a cascade heat exchanger.

[0012] In one of the embodiments, the high-temperature unit comprises a second evaporator, a second low-pressure compressor, a second high-pressure compressor, and a second condenser; the second evaporator exchanges heat with the first condenser, and the input end of the second evaporator is connected to the working medium output end of the second condenser by a pipeline; the output end of the second evaporator, the second low-pressure compressor, the second high-pressure compressor, and the working medium input end of the second condenser are sequentially connected by pipelines to form a high-temperature stage compression system; the cold water injection end of the second condenser is connected to an external process water source and the second plate heat exchanger by a pipeline, and the hot water output end of the second condenser is connected to the input end of the output module by a pipeline.

[0013] In one of the embodiments, the high-temperature unit further comprises a second intermediate cooler, which is arranged between the second low-pressure compressor and the second high-pressure compressor, and the second low-pressure compressor, the second intermediate cooler, and the second high-pressure compressor are sequentially connected by pipelines.

[0014] In one of the embodiments, the second evaporator is a cascade heat exchanger.

[0015] In one of the embodiments, the output module comprises a heat storage tank, the input end of the heat storage tank is connected to the hot water output end of the second condenser by a pipeline, and the output end of the heat storage tank is connected to the outside of the system.

[0016] In one of the embodiments, the output module further comprises a flash tank, the input end of the flash tank is connected to the output end of the heat storage tank by a pipeline, and the vapor output end of the flash tank is connected to the outside of the system.

[0017] In one of the embodiments, the other saturated water output end of the flash tank is connected to the second plate heat exchanger, so that the recyclable process cold water in the flash tank can be preheated by the second plate heat exchanger together with the process cold water return water flowing back to the water side of the second condenser.

[0018] In one of the embodiments, the control module is connected to the first low-pressure compressor, the first high-pressure compressor, the second low-pressure compressor, and the second high-pressure compressor, respectively.

[0019] In one of the embodiments, the process cold water temperature output by the second plate heat exchanger to the water side of the second condenser is set to 60-80℃, and the pressure is set to 0.5-1.0 MPa.

[0020] In one of the embodiments, the process high-temperature hot water temperature output by the hot water output end of the second condenser is set to 120-180℃, and the pressure is set to 0.8-1.5 MPa.

[0021] In one of the embodiments, the low-temperature working medium temperature output by the first plate heat exchanger to the first evaporator is set to 40-50℃, and the pressure is set to normal pressure.

[0022] In one embodiment, the low-pressure steam temperature outputted from the vapor output end of the flash tank is set to 110-120℃, and the pressure is set to 0.3-0.8 bar.

[0023] In summary, the high-temperature heat pump coupled system of the present application has the following advantages: (1) The deep gradient waste heat utilization function of the waste heat recovery module significantly improves the heat source grade through multi-stage waste heat recovery, greatly reduces the temperature rise requirement of the high-temperature heat pump, fully utilizes the waste heat and process water waste heat, effectively improves the heating performance of the system, and further improves the energy utilization rate; (2) The low-temperature unit and the high-temperature unit are cooperated to realize the independent operation of the low-temperature stage and the high-temperature stage of the heat pump, so that the low-temperature working medium and the high-temperature working medium can be independently selected and circulated, and the compatibility and adaptability of the working medium and the working condition are improved, while ensuring the high heating performance of the system, the system operation stability is improved; (3) The high-temperature heat energy output and storage are realized through the independent output module, so as to provide energy buffer between the waste heat recovery module and the high-temperature unit, and optimize the operation period of the high-temperature heat pump module, improve the economy and stability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the high-temperature heat pump coupled system in one embodiment. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the scope of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as limiting the present application.

[0027] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and are not used to denote or imply relative importance or a number of indications of the technical features indicated. Thus, the technical features defined with "first", "second" can explicitly or implicitly include at least one of the technical features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0028] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0030] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes, and are not the only embodiment.

[0031] Please refer to Figure 1This invention discloses a coupling system of a high-temperature heat pump and waste heat recovery. The coupling system includes a control module 1, a high-temperature heat pump module, an output module 2, and a waste heat recovery module 3. The output end of the high-temperature heat pump module exchanges heat with the input end of the output module 2. The output end of the output module 2 exchanges heat with the input end of the high-temperature heat pump through the waste heat recovery module 3, thereby forming a coupling structure between the high-temperature heat pump module and the waste heat recovery module 3. The output module 2 outputs heat energy to the outside of the system. The control end of the control module 1 is connected to the high-temperature heat pump module, the output module 2, and the waste heat recovery module 3, respectively, thereby realizing intelligent control of the high-temperature heat pump module, the output module 2, and the waste heat recovery module 3 by the control module 1. Specifically, the high-temperature heat pump module includes a low-temperature unit 4 and a high-temperature unit 5. The low-temperature unit 4 and the high-temperature unit 5 each form an independent working fluid circulation structure. At the same time, the output end of the low-temperature unit 4 exchanges heat with the input end of the high-temperature unit 5. The output end of the high-temperature unit 5 is connected to the input end of the output module 2 via a pipe. Meanwhile, the waste heat recovery module 3 includes a first plate heat exchanger 31 and a second plate heat exchanger 32. The first plate heat exchanger 31 is disposed between the output end of the low-temperature unit 4 and the input end of the low-temperature unit 4, and the second plate heat exchanger 32 is disposed between the output end of the output module 2 and the output end of the high-temperature unit 5. Based on the above configuration, in practical applications, the high-temperature heat pump and waste heat recovery coupling system of the present invention, the return working fluid output from the low-temperature unit 4 flows through one side of the first plate heat exchanger 31, and the other side of the first plate heat exchanger 31 passes through a low-temperature waste heat source (such as cooling water at a temperature of 30-40°C), thereby allowing the return low-temperature, low-pressure liquid working fluid to absorb heat from the low-temperature waste heat source and flow into the low-temperature unit 4; the low-temperature unit 4, in conjunction with the high-temperature unit 5, performs multi-stage heating of the working fluid to obtain a high-temperature, high-pressure steam working fluid; the high-temperature, high-pressure steam and the externally input cold water injection end of the high-temperature unit 5... After the cold water completes the heat exchange, it becomes high-temperature hot water for the process. The high-temperature hot water is then transported to the output module 2 for storage or output to the outside of the system. The waste heat fluid and process cold water return water generated by the output module 2 flow through one side of the second plate heat exchanger 32 and return to the cold water injection end of the output end of the high-temperature unit 5. The other side of the second plate heat exchanger 32 passes through a medium-temperature waste heat source (such as process drainage at a temperature of 50-70℃). This allows the medium-temperature waste heat fluid to preheat the output end of the high-temperature unit 5 through heat exchange, thereby reducing the temperature rise burden of the high-temperature unit 5.Therefore, the high-temperature heat pump coupled with the waste heat recovery system of the application can significantly improve the heating performance of the system by deep cascade waste heat utilization and multi-stage waste heat recovery, and greatly reduce the temperature rise requirement of the high-temperature heat pump, so as to effectively improve the heating performance of the system. Moreover, the low-temperature unit 4 and the high-temperature unit 5 are cooperated to realize independent operation of the low-temperature stage and the high-temperature stage of the heat pump, so that the low-temperature working medium and the high-temperature working medium can be independently selected and circulated, and the compatibility and adaptability of the working medium and the working condition are improved, so as to ensure the high heating performance of the system and improve the operation stability of the system. In addition, the high-temperature heat energy output and storage are realized by the independent output module 2 to provide energy buffer between the waste heat recovery module 3 and the high-temperature unit 5, and to optimize the operation period of the high-temperature heat pump module, so as to improve the economy and stability of the system.

[0032] Further, the low-temperature unit 4 includes a first evaporator 41, a first low-pressure compressor 42, a first high-pressure compressor 43, and a first condenser 44. The input end of the first evaporator 41 is connected to the output end of the first condenser 44 through the first plate heat exchanger 31. The output end of the first evaporator 41, the first low-pressure compressor 42, the first high-pressure compressor 43, and the first condenser 44 are sequentially connected by pipelines, and the first condenser 44 exchanges heat with the input end of the high-temperature unit 5, so as to form a low-temperature stage compression system. Based on the above arrangement, the low-temperature unit 4 can fully utilize the low-temperature waste heat through the first plate heat exchanger 31.

[0033] Further, the low-temperature unit 4 further includes a first intermediate cooler 45, which is arranged between the first low-pressure compressor 42 and the first high-pressure compressor 43, and the first low-pressure compressor 42, the first intermediate cooler 45, and the first high-pressure compressor 43 are sequentially connected by pipelines to cool and increase the efficiency of the first low-pressure compressor 42 and the first high-pressure compressor 43.

[0034] Further, in one embodiment, the first evaporator 41 adopts a cascade heat exchanger.

[0035] Further, the high-temperature unit 5 comprises a second evaporator 51, a second low-pressure compressor 52, a second high-pressure compressor 53, and a second condenser 54; the second evaporator 51 exchanges heat with the first condenser 44, and the input end of the second evaporator 51 is connected to the working medium output end of the second condenser 54 through a pipeline; the output end of the second evaporator 51, the second low-pressure compressor 52, the second high-pressure compressor 53, and the working medium input end of the second condenser 54 are sequentially connected through pipelines to form a high-temperature stage compression system; the cold water injection end of the second condenser 54 is connected to an external process water source and the second plate heat exchanger 32 through a pipeline, and the hot water output end of the second condenser 54 is connected to the input end of the output module 2 through a pipeline. Based on the above arrangement, on the working medium side, the water side of the second condenser 54 can fully utilize the medium-temperature waste heat through the second plate heat exchanger 32, so as to realize preheating of the water side of the second condenser 54, thereby reducing the temperature rise burden in the working process of the second condenser 54.

[0036] Further, the high-temperature unit 5 further comprises a second intermediate cooler 55, which is arranged between the second low-pressure compressor 52 and the second high-pressure compressor 53, and the second low-pressure compressor 52, the second intermediate cooler 55, and the second high-pressure compressor 53 are sequentially connected through pipelines to cool the second low-pressure compressor 52 and the second high-pressure compressor 53 for efficiency improvement.

[0037] Further, in one embodiment, the second evaporator 51 adopts a cascade heat exchanger.

[0038] Further, the output module 2 comprises a heat storage tank 21, the input end of the heat storage tank 21 is connected to the hot water output end of the second condenser 54 through a pipeline, and the output end of the heat storage tank 21 is connected to the outside of the system, so that the process high-temperature hot water output by the high-temperature heat pump module can be stored and output in the heat storage tank 21.

[0039] Further, in one embodiment, the output module 2 further comprises a flash tank 22, the input end of the flash tank 22 is connected to the output end of the heat storage tank 21 through a pipeline, and the vapor output end of the flash tank 22 is connected to the outside of the system, so as to meet the output demand of low-pressure steam.

[0040] Further, in another embodiment, another saturated water output end of the flash tank 22 is connected to the second plate heat exchanger 32, so that the recyclable process cold water in the flash tank 22 can be preheated by the second plate heat exchanger 32 together with the process cold water return water and then returned to the water side of the second condenser 54 for preheating work.

[0041] Further, the control module 1 is connected to the first low-pressure compressor 42, the first high-pressure compressor 43, the second low-pressure compressor 52, and the second high-pressure compressor 53 respectively to realize frequency control of the compressors by the control module 1.

[0042] Further, in one embodiment, the second plate heat exchanger 32 outputs process cold water to the second condenser 54 at a temperature of 60-80 DEG C and a pressure of 0.5-1.0 MPa.

[0043] Further, in one embodiment, the second condenser 54 outputs high-temperature process hot water at a temperature of 120-180 DEG C and a pressure of 0.8-1.5 MPa.

[0044] Further, in one embodiment, the first plate heat exchanger 31 outputs low-temperature working medium to the first evaporator 41 at a temperature of 40-50 DEG C and a pressure of normal pressure.

[0045] Further, in one embodiment, the flash tank 22 outputs low-pressure steam at a temperature of 110-120 DEG C and a pressure of 0.3-0.8 bar.

[0046] In summary, the high-temperature heat pump coupled with the waste heat recovery system of the present application significantly improves the heat source grade through the deep gradient waste heat utilization function of the waste heat recovery module, significantly reduces the temperature rise requirement of the high-temperature heat pump, and fully utilizes the waste heat and process water waste heat, thereby effectively improving the heating performance of the system and further improving the energy utilization rate. Furthermore, the low-temperature unit and the high-temperature unit are cooperated to realize independent operation of the low-temperature stage and the high-temperature stage of the heat pump, so that the low-temperature working medium and the high-temperature working medium can be independently selected and circulated, and the compatibility and adaptability of the working medium and the working condition are improved, thereby ensuring the high heating performance of the system and improving the system operation stability. In addition, the independent output module realizes high-temperature heat energy output and storage, thereby providing energy buffer between the waste heat recovery module and the high-temperature unit, optimizing the operation period of the high-temperature heat pump module, and improving the economy and stability of the system.

[0047] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0048] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A coupling system of high-temperature heat pump and waste heat recovery, characterized in that, The application relates to a high-temperature heat pump system, which comprises a control module, a high-temperature heat pump module, an output module and a waste heat recovery module. The output end of the high-temperature heat pump module is in heat exchange with the input end of the output module; the output end of the output module is in heat exchange with the input end of the high-temperature heat pump through the waste heat recovery module, so that a coupling structure between the high-temperature heat pump module and the waste heat recovery module is formed, wherein the output module outputs heat energy to the outside of the system; the control end of the control module is connected with the high-temperature heat pump module, the output module and the waste heat recovery module, so that the control module realizes intelligent control over the high-temperature heat pump module, the output module and the waste heat recovery module. The high-temperature heat pump module comprises a low-temperature unit and a high-temperature unit; the low-temperature unit and the high-temperature unit form independent working medium circulation structures respectively, and the output end of the low-temperature unit is in heat exchange with the input end of the high-temperature unit; the output end of the high-temperature unit is connected with the input end of the output module through a pipeline; meanwhile, the waste heat recovery module comprises a first plate heat exchanger and a second plate heat exchanger; the first plate heat exchanger is arranged between the output end of the low-temperature unit and the input end of the low-temperature unit, and the second plate heat exchanger is arranged between the output end of the output module and the output end of the high-temperature unit. The low-temperature unit comprises a first evaporator, a first low-pressure compressor, a first high-pressure compressor and a first condenser; the input end of the first evaporator is connected with the output end of the first condenser through the first plate heat exchanger; 2. The high temperature heat pump and waste heat recovery coupled system of claim 1, wherein, The output end of the first evaporator, the first low-pressure compressor, the first high-pressure compressor and the first condenser are sequentially connected through pipelines; the first condenser is in heat exchange with the input end of the high-temperature unit, so that a low-temperature stage compression system is formed. The low-temperature unit further comprises a first intermediate cooler; the first intermediate cooler is arranged between the first low-pressure compressor and the first high-pressure compressor, and the first low-pressure compressor, the first intermediate cooler and the first high-pressure compressor are sequentially connected through pipelines.

3. The high temperature heat pump and waste heat recovery coupled system of claim 2, wherein, The first evaporator adopts a cascade heat exchanger.

4. The high temperature heat pump and waste heat recovery coupled system of claim 3, wherein, The high-temperature unit comprises a second evaporator, a second low-pressure compressor, a second high-pressure compressor and a second condenser; the second evaporator is in heat exchange with the first condenser; the input end of the second evaporator is connected with the working medium output end of the second condenser through a pipeline; 5. The system of claim 3, wherein, The output end of the second evaporator, the second low-pressure compressor, the second high-pressure compressor and the working medium input end of the second condenser are sequentially connected through pipelines, so that a high-temperature stage compression system is formed; The cold water injection end of the second condenser is connected with an external process water source and the second plate heat exchanger through a pipeline; the hot water output end of the second condenser is connected with the input end of the output module through a pipeline. The high-temperature unit further comprises a second intermediate cooler; the second intermediate cooler is arranged between the second low-pressure compressor and the second high-pressure compressor, and the second low-pressure compressor, the second intermediate cooler and the second high-pressure compressor are sequentially connected through pipelines.

6. The high temperature heat pump and waste heat recovery coupled system of claim 5, wherein, The second evaporator adopts a cascade heat exchanger.

7. The high temperature heat pump and waste heat recovery coupled system of claim 6, wherein, The output module comprises a heat storage tank; the input end of the heat storage tank is connected with the hot water output end of the second condenser through a pipeline; the output end of the heat storage tank is connected to the outside of the system.

8. The high temperature heat pump and waste heat recovery coupled system of claim 6, wherein, The output module further comprises a flash tank; the input end of the flash tank is connected with the output end of the heat storage tank through a pipeline; the vapor output end of the flash tank is connected to the outside of the system.

9. The high temperature heat pump and waste heat recovery coupled system of claim 8, wherein, ​ 10. The high temperature heat pump and waste heat recovery coupled system of claim 9, wherein, Another saturated water output end of the flash tank is communicated to the second plate heat exchanger, so that the recyclable process cold water in the flash tank can be preheated by the second plate heat exchanger and the process cold water return water together and return to the water side of the second condenser.

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