Ejector synergistic absorption and compression high-temperature heat pump system

Abstract

The invention discloses an absorption and compression high-temperature heat pump system with a synergistic ejector. The absorption and compression high-temperature heat pump system comprises a compression type heat pump, an absorption type heat pump and the ejector. The compression heat pump comprises a gas-liquid separator, a compressor, an intermediate heat exchanger and a working medium pump, a gas phase outlet of the gas-liquid separator, the compressor, the intermediate heat exchanger, the ejector and an inlet of the gas-liquid separator are sequentially connected, and the working medium pump is connected between a liquid phase outlet of the gas-liquid separator and the intermediate heat exchanger. A first outlet of the solution heat exchanger and an inlet of the expansion valve generator are sequentially connected, a first outlet of the generator is connected with the ejector, a second outlet of the generator is connected with an inlet of the solution pump, an outlet of the solution pump is connected with a second inlet of the solution heat exchanger, and a second outlet of the solution heat exchanger is connected with a second inlet of the absorber. The heat supply efficiency of the absorption heat pump can be improved, and the problems that due to the fact that the exhaust temperature of the compressor is too high, lubricating oil is cracked, and the high-temperature heat supply compression ratio is too large are solved.

Description

Technical Field

[0001] This application belongs to the technical field of hybrid heat pumps, and particularly relates to an absorption-compression high-temperature heat pump system with an ejector for efficiency enhancement. Background Art

[0002] With the rapid growth of the global economy, energy consumption shows a sharp upward trend, and the energy consumption in the industrial sector accounts for a quite large proportion. During the industrial production process, many low-grade waste heats are often ignored or not effectively recovered and utilized, which not only leads to a great waste of energy but also exacerbates the environmental pollution problem. Therefore, the efficient recovery and utilization of industrial waste heat have become an important way for current energy conservation, emission reduction, and promoting sustainable development.

[0003] Heat pump technology is an efficient way of energy conversion and utilization. By consuming a small amount of electric energy, it absorbs heat from a low-temperature heat source and releases it to a high-temperature heat source. Coupling an absorption heat pump with a compression heat pump has been one of the research hotspots in heat pump technology in recent years. The coupling includes two types: mass coupling and heat coupling. Mass coupling includes ways such as arranging a compressor between an evaporator and an absorber, between a generator and a condenser, between a generator and an absorber, etc., aiming to improve the low-temperature adaptability of the system, reduce energy input, and improve the system efficiency. Heat coupling means connecting two or more heat pump systems through heat exchangers and other means to expand the operating temperature range of the system, enabling the heat pump system to operate efficiently within a wider temperature range and improving the overall performance of the system.

[0004] Currently, heat pump coupling still faces certain technical limitations. For example, in mass coupling, there are problems such as a large compression ratio and a high compressor discharge temperature caused by single-stage compression of the compressor, and heat coupling will generate irreversible heat transfer loss, and a series of problems such as complex structure and high investment cost.

[0005] Li Peng et al. disclosed in the Chinese invention open patent CN106839502A "The second type of absorption heat pump based on an ejector". This solution has relatively high requirements for the application scenario. The system requires two medium-temperature heat sources with different temperatures. The higher-temperature medium-temperature heat source is used for the evaporator, and the lower-temperature medium-temperature heat source is used for the generator, narrowing the application scenario of the heat pump system. Summary of the Invention

[0006] In order to solve at least one of the problems existing in the prior art, the present invention provides an ejector-enhanced absorption compression high-temperature heat pump system, which introduces a compressor and an ejector on the basis of an absorption heat pump. The introduction of the compressor improves the heating efficiency of the second-class absorption heat pump, replacing the operation mode of outputting a large amount of medium-temperature heat energy and a small amount of high-temperature heat energy with the operation mode of inputting a small amount of low-temperature heat energy and electric energy and outputting a large amount of high-temperature heat energy. The introduction of the ejector broadens the working range of the heat pump, increases the suction pressure of the compressor, effectively solves the large compression ratio, and improves the overall performance of the system.

[0007] To achieve the above object, an ejector-enhanced absorption compression high-temperature heat pump system provided by the present invention includes a compression heat pump, an absorption heat pump and an ejector;

[0008] The compression heat pump includes a gas-liquid separator, a compressor, an intermediate heat exchanger, and a working fluid pump. The gas-phase outlet of the gas-liquid separator, the compressor, the intermediate heat exchanger, the ejector, and the inlet of the gas-liquid separator are connected in sequence, and the working fluid pump is connected between the liquid-phase outlet of the gas-liquid separator and the intermediate heat exchanger;

[0009] The absorption heat pump includes an absorber, a solution heat exchanger, an expansion valve, a solution pump, and a generator. The outlet of the absorber is connected to the first inlet of the solution heat exchanger, the first outlet of the solution heat exchanger is connected to the inlet of the expansion valve, the outlet of the expansion valve is connected to the inlet of the generator, the first outlet of the generator is connected to the ejector, the second outlet of the generator is connected to the inlet of the solution pump, the outlet of the solution pump is connected to the second inlet of the solution heat exchanger, and the second outlet of the solution heat exchanger is connected to the second inlet of the absorber.

[0010] The absorber absorbs the high-pressure steam brought by the intermediate heat exchanger. The steam enters the absorber and is absorbed, releasing heat Q to the outside world ab , and the formed solution exchanges heat through the solution heat exchanger, and then is throttled isenthalpically by the expansion valve and sent to the generator, where it absorbs the heat Q supplied from the outside ge to heat the solution, the gas evaporates from the solution and enters the ejector, and the remaining solution is pressurized by the solution pump, exchanges heat through the heat exchanger and then enters the absorber to complete the absorption part of the cycle.

[0011] Utilizing the multi-fluid mixing characteristics of the ejector itself, the compression heat pump and the absorption heat pump are connected, avoiding the traditional intermediate heat exchange coupling method and reducing the irreversible heat transfer during system coupling loss.

[0012] Furthermore, the ejector is an area-adjustable ejector.

[0013] Furthermore, the compressor adopts a compressor type adapted to the refrigerant-absorbent working fluid pair.

[0014] Further, the compressor uses a steam compressor or an ammonia compressor.

[0015] Further, an intermediate heat exchanger is provided between the absorber and the working fluid pump. The heat exchange fluids on both sides of the intermediate heat exchanger are the liquid refrigerant boosted by the working fluid pump and the gaseous refrigerant boosted by the compressor respectively.

[0016] Further, refrigerant vapor evaporated in the high-pressure ejector generator at the outlet of the intermediate heat exchanger.

[0017] Further, the saturated liquid fluid at the liquid phase outlet of the intermediate heat exchanger and the saturated gaseous fluid at the outlet of the generator enter the ejector to mix, forming a gas-liquid two-phase mixed fluid. After reaching pressure balance, the gas-liquid two-phase mixed fluid enters the diffuser section of the ejector, and after decelerating and boosting pressure through the diffuser section, it enters the gas-liquid separator.

[0018] Further, the generator is connected to the ejector. The first end inlet of the ejector is connected to the output port of the intermediate heat exchanger, the second end inlet is connected to the output port of the generator, and the output port is connected to the input port of the gas-liquid separator. The saturated liquid fluid at the outlet of the intermediate heat exchanger and the saturated gaseous fluid at the outlet of the generator enter the ejector to mix, forming a gas-liquid two-phase mixed fluid. After reaching pressure balance, the fluid enters the diffuser section of the ejector, and after decelerating and boosting pressure through the diffuser section, it enters the gas-liquid separator; the gas-phase outlet of the gas-liquid separator is connected to the compressor, and the liquid-phase outlet of the gas-liquid separator is connected to the working fluid pump.

[0019] After the mixed two-phase mixed fluid is decelerated and pressurized by the ejector, it can increase the suction pressure of the compressor, reduce the gas flow rate entering the compressor, thereby reducing the compression ratio and the power consumption of the compressor, and effectively improving the overall performance of the compressor and the system.

[0020] Further, the gas-liquid separator receives the gas-liquid two-phase mixed fluid from the outlet of the ejector. The gas-phase fluid coming out of the gas-liquid separator is boosted by the compressor. The compressor compresses the low-temperature and low-pressure saturated gas into a high-temperature and high-pressure superheated gas. The boosted fluid enters the intermediate heat exchanger to release heat and condenses into a high-temperature and high-pressure saturated liquid; the fluid after releasing heat enters the ejector to eject the refrigerant vapor of the generator; the liquid-phase fluid of the gas-liquid separator is boosted by the working fluid pump, and the boosted fluid enters the intermediate heat exchanger to absorb heat (exchanging heat with the superheated gas and becoming saturated steam), and the refrigerant vapor after absorbing heat returns to the absorber to complete the compression loop cycle.

[0021] Further, the concentrated refrigerant solution in the absorber releases heat through the solution heat exchanger, then enters the expansion valve to reduce pressure, and the solution after reducing pressure enters the generator to absorb heat and separate. The separated absorbent enters the solution pump to be boosted, and then enters the solution heat exchanger to absorb heat. The refrigerant dilute solution after absorbing heat returns to the absorber to complete the solution loop cycle.

[0022] Furthermore, the ejector is an area-adjustable ejector, which can adjust the throat area of the ejector according to the actual operating conditions of the system to enhance the entrainment capacity of the ejector. The ejector can adapt to different operating conditions.

[0023] Furthermore, the compressor is a compressor type such as a steam compressor or an ammonia compressor that is suitable for the refrigerant-absorbent working fluid pair, and different models and sizes of compressors can be selected according to the type and flow rate of the inhaled refrigerant.

[0024] Furthermore, the refrigerant-absorbent working fluid pair is selected considering the availability of the compressor and the separation and absorption effects of the refrigerant and the absorbent.

[0025] Introducing a compressor can effectively improve the heating efficiency of the second type of absorption heat pump.

[0026] Introducing an intermediate heat exchanger can effectively avoid the cracking of lubricating oil caused by too high exhaust temperature of the compressor and too large high-temperature heating compression ratio.

[0027] Introducing an ejector broadens the operating range of the high-temperature heat pump, enabling the generator to absorb heat at a lower temperature and form a saturated gas to enter the ejector for mixing.

[0028] An intermediate heat exchanger is added between the refrigerant vapor circuit of the absorber and the working fluid pump. The heat exchange fluids on both sides are the liquid refrigerant boosted by the working fluid pump and the gaseous refrigerant boosted by the compressor respectively. The two respectively represent the evaporator and condenser of the traditional absorption compression system, meeting the large amount of medium-temperature heat demand of the absorption heat pump.

[0029] The liquid-phase fluid of the gas-liquid separator enters the intermediate heat exchanger to absorb heat after being boosted by the working fluid pump; the gas-phase fluid of the gas-liquid separator enters the intermediate heat exchanger to release heat after being boosted by the compressor. The two fluids flow to the compression circuit and the absorption circuit respectively to achieve the medium-temperature heating effect in the compression circuit.

[0030] As a connecting component between the compression circuit and the absorption circuit, the ejector can use the high-pressure at the outlet of the intermediate heat exchanger to entrain the refrigerant vapor evaporated in the generator. The two are mixed in the ejector and then enter the gas-liquid separator. The presence of the ejector reduces the heat absorption temperature in the generator and expands the operating temperature range of the high-temperature heat pump unit. In addition, the mixing characteristics inside the ejector can achieve the energy and quality exchange of the two fluids, avoiding the heat transfer loss of the traditional thermal coupling method and reducing the irreversible loss of the system.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] The present invention introduces an ejector and utilizes the multi-fluid mixing characteristics of the ejector itself to connect the compression part and the absorption part, avoiding the traditional intermediate heat exchange coupling method and reducing the irreversible heat transfer during system coupling. loss; it broadens the operating range of the high-temperature heat pump, allowing the generator to absorb heat at a lower temperature to form saturated gas that enters the ejector for mixing; it increases the compressor suction pressure, reduces the gas flow entering the compressor, and thus reduces the compression ratio, reduces the compressor power consumption, and effectively improves the overall performance of the compressor and the system.

[0033] On the basis of the absorption heat pump, the present invention adds a compressor branch, which effectively improves the heating efficiency of the absorption heat pump. At the same time, an intermediate heat exchanger is connected after the compressor to avoid problems such as lubricating oil cracking and excessive high-temperature heating compression ratio caused by excessive compressor exhaust temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the structure of an ejector-enhanced absorption-compression high-temperature heat pump system provided in an embodiment of the present invention;

[0035] Figure 2 This is a PT diagram of an ejector-enhanced absorption compression high-temperature heat pump system in an embodiment of the present invention;

[0036] Figure 3 A pressure-enthalpy diagram (Ph diagram) of an ejector-enhanced absorption-compression high-temperature heat pump system in an embodiment of the present invention;

[0037] Markings in the figure: 101, absorber; 102, solution heat exchanger; 103, expansion valve; 104, solution pump; 105, generator; 106, ejector; 107, gas-liquid separator; 108, compressor; 109, intermediate heat exchanger; 110, working fluid pump. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiment of the present invention more clear, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0040] like Figure 1As shown in the figure, an ejector-enhanced absorption compression high-temperature heat pump system provided by the present invention includes a compression heat pump, an absorption heat pump, and an ejector 106. The compression heat pump and the absorption heat pump are connected by the ejector 106. The absorption heat pump includes an absorber 101, a solution heat exchanger 102, an expansion valve 103, a solution pump 104, and a generator 105. The compression heat pump includes a gas-liquid separator 107, a compressor 108, an intermediate heat exchanger 109, and a working fluid pump 110. Each component works together. The saturated gas phase outlet of the gas-liquid separator 107 is connected to the suction port of the compressor 108. The output port of the compressor 108 is connected to the first input port of the intermediate heat exchanger 109. The first output port of the intermediate heat exchanger 109 is connected to the first end inlet of the ejector 106. The saturated liquid phase outlet of the gas-liquid separator 107 is connected to the inlet of the working fluid pump 110. The outlet of the working fluid pump 110 is connected to the second input port of the intermediate heat exchanger 109. The second outlet of the intermediate heat exchanger 109 is connected to the inlet of the absorber 101. The first outlet of the generator 105 is connected to the second end inlet of the ejector 106. The outlet of the ejector 106 is connected to the inlet of the gas-liquid separator 107. The absorption part: The outlet of the absorber 101 is connected to the first inlet of the solution heat exchanger 102. The first outlet of the solution heat exchanger 102 is connected to the inlet of the expansion valve 103. The outlet of the expansion valve 103 is connected to the inlet of the generator 105. The second outlet of the generator 105 is connected to the inlet of the solution pump 104. The outlet of the solution pump 104 is connected to the second inlet of the solution heat exchanger 102. The second outlet of the solution heat exchanger 102 is connected to the second inlet of the absorber 101. Thus, a complete ejector-enhanced absorption compression high-temperature heat pump cycle system is formed.

[0041] The absorber 101 can release high-temperature heat energy to meet the high-temperature heating demand. In some embodiments of the present invention, the appropriate absorber model is selected by comprehensively considering solution component characteristics such as boiling point, freezing point, specific heat capacity, etc., and system operating conditions such as temperature range, pressure range, load change, etc.

[0042] The solution heat exchanger 102 can recover the heat energy of the solution at the outlet of the absorber 101 and realize the heat exchange between solutions. In some embodiments of the present invention, different models and types of solution heat exchangers can be selected according to the solution type and the heat exchange amount.

[0043] The expansion valve 103 can reduce the pressure of the circulating solution. In some embodiments of the present invention, different models of expansion valves are replaced and used according to the solution mass flow rate and different types.

[0044] The solution pump 104 can transport the solution in the generator 105 to the absorber 101 to realize the recycling of the solution. In some embodiments of the present invention, pumps of different sizes and models are selected according to the type and flow rate of the working fluid.

[0045] The generator 105 can separate the refrigerant from the absorbent by absorbing heat. In some embodiments of the present invention, a suitable generator model is selected by comprehensively considering solution component characteristics such as boiling point, freezing point, specific heat capacity, etc. and system operating conditions such as temperature range, pressure range, load variation, etc.

[0046] The ejector 106 can use the ejecting fluid to increase the pressure of the entrained fluid and achieve the pressure boosting effect of the entrained fluid. In some embodiments of the present invention, the specifications of the ejector are selected according to the thermodynamic characteristics of the ejecting fluid and the entrained fluid.

[0047] The gas-liquid separator 107 can separate working fluids in different phases and also has a liquid storage function. In some embodiments of the present invention, the type of the separation device is determined according to the actual application requirements.

[0048] The compressor 108 can increase the temperature and pressure of the working fluid and drive the working fluid to circulate in the system. In some embodiments of the present invention, the type and capacity of the compressor to be used are selected according to specific requirements and the system scale.

[0049] The intermediate heat exchanger 109 allows two different fluids to exchange heat inside it. In some embodiments of the present invention, the size and model of the heat exchanger to be used are selected according to the flow characteristics and flow rate of the heat exchange fluids.

[0050] The working fluid pump 110 can increase the fluid pressure and maintain the circulating flow. In some embodiments of the present invention, the size and model of the pump to be used are selected according to the type of the working fluid and the flow rate.

[0051] Such as Figure 2 And Figure 3As shown, they are respectively the P-T diagram and the pressure-enthalpy diagram (P-h diagram) of an ejector-augmented absorption compression high-temperature heat pump system. The specific working process of the compression part is as follows: The saturated vapor fluid (point 3g) is compressed by the compressor 108 into a high-pressure superheated gas (point 1), enters the intermediate heat exchanger 109, and becomes a saturated liquid (point 2) after isobaric heat release, and enters the nozzle of the ejector 106 as the primary fluid. After expanding in the nozzle, it becomes a low-pressure high-speed gas-liquid two-phase mixed fluid (point 2'); The saturated liquid phase fluid (point 3l) is pressurized by the working fluid pump 110 into a superheated gas (point 4), then enters the intermediate heat exchanger 109, becomes a saturated gas (point 5) after isobaric heat absorption, and then enters the absorber 101; The saturated vapor fluid (point 9) at the outlet of the generator 105 is mixed with the low-pressure high-speed gas-liquid two-phase mixed fluid (point 2') (point 3'), and after decelerating and boosting by the ejector 106, it becomes a gas-liquid two-phase mixed fluid (point 3), and then enters the gas-liquid separator 107. The specific working process of the absorption part is as follows: The rich solution (point 6) in the absorber 101 enters the generator 105 after isenthalpic throttling by the expansion valve 103 (point 8) after releasing heat in the solution heat exchanger 102 (point 7); The solution absorbs the external heat Q ge in the generator 105 to evaporate the gaseous fluid (point 9) and enter the second-end inlet of the ejector 106. The remaining solution becomes the lean solution (point 10), is pressurized by the solution pump 104 (point 11), absorbs heat in the solution heat exchanger 102 (point 12), and finally enters the absorber 101 to mix with the saturated vapor fluid (point 5) from the intermediate heat exchanger 109 to release heat Q to the outside ab to form a rich solution; thus completing the cycle.

[0052] Based on the second-type absorption heat pump, the embodiment of the present invention adds an ejector and a compressor branch, realizing the efficient recovery of low-grade waste heat and overcoming the compressor-related problems caused by high-temperature characteristics. The outlet fluid of the generator is ejected by the outlet fluid of the intermediate heat exchanger in the ejector. The two are mixed in the ejector and then enter the gas-liquid separator. The gas phase is boosted by the compressor and enters the intermediate heat exchanger to release heat. The fluid after heat release is called the primary flow of the ejector; The liquid phase is boosted by the pump and absorbs heat in the intermediate heat exchanger. The fluid after heat absorption enters the absorber to complete the compression part cycle. The presence of the ejector enables the generator to absorb heat at a lower temperature, broadening the operating range of the high-temperature heat pump. The outlet fluid of the compressor releases heat in the intermediate heat exchanger, avoiding the cracking of lubricating oil caused by too high exhaust temperature and too large high-temperature heat supply compression ratio. Utilizing the multi-fluid mixing characteristics of the ejector itself, the compression part and the absorption part are connected, avoiding the traditional intermediate heat exchange coupling method and reducing the irreversible heat transfer during system coupling Loss. The introduction of the compressor improves the heating efficiency of the second-class absorption heat pump, replacing the operation mode of outputting a large amount of medium-temperature heat energy and a small amount of high-temperature heat energy with the operation mode of inputting a small amount of low-temperature heat energy and electric energy and outputting a large amount of high-temperature heat energy. While improving the heating temperature range of the heat pump, a series of problems caused by high temperature are avoided. It has good economic benefits and environmental friendliness, and can solve problems such as difficult recovery of industrial waste heat, large compression ratio of single-stage compression high-temperature heat pump, high compressor exhaust temperature, and poor performance of absorption heat pump.

[0053] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined in the present invention can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in the present invention, but will conform to the widest scope consistent with the principles and novel features disclosed in the present invention.

Claims

1. An ejector-enhanced absorption compression high-temperature heat pump system, characterized in that: It includes a compression heat pump, an absorption heat pump and an ejector (106); The compression heat pump comprises a gas-liquid separator (107), a compressor (108), an intermediate heat exchanger (109), and a working fluid pump (110); the gas phase outlet of the gas-liquid separator (107), the compressor (108), the intermediate heat exchanger (109), the ejector (106), and the inlet of the gas-liquid separator (107) are connected in sequence, and the working fluid pump (110) is connected between the liquid phase outlet of the gas-liquid separator (107) and the intermediate heat exchanger (109); The absorption heat pump comprises an absorber (101), a solution heat exchanger (102), an expansion valve (103), a solution pump (104) and a generator (105). The outlet of the absorber (101) is connected to the first inlet of the solution heat exchanger (102), the first outlet of the solution heat exchanger (102) is connected to the inlet of the expansion valve (103), the outlet of the expansion valve (103) is connected to the inlet of the generator (105), the first outlet of the generator (105) is connected to the ejector (106), the second outlet of the generator (105) is connected to the inlet of the solution pump (104), the outlet of the solution pump (104) is connected to the second inlet of the solution heat exchanger (102), and the second outlet of the solution heat exchanger (102) is connected to the second inlet of the absorber (101).

2. The ejector-enhanced absorption-compression high-temperature heat pump system according to claim 1, characterized in that: The injector (106) is an area-adjustable injector.

3. The ejector-enhanced absorption-compression high-temperature heat pump system according to claim 1, characterized in that: The compressor (108) is a compressor type adapted to the refrigerant-absorbent working fluid pair.

4. The ejector-enhanced absorption-compression high-temperature heat pump system according to claim 3, characterized in that: The compressor (108) is a water vapor compressor or an ammonia compressor.

5. The ejector-enhanced absorption-compression high-temperature heat pump system according to claim 1, characterized in that: An intermediate heat exchanger (109) is provided between the absorber (101) and the working fluid pump (110), and the heat exchange fluids on both sides of the intermediate heat exchanger (109) are respectively liquid refrigerant pressurized by the working fluid pump (110) and gaseous refrigerant pressurized by the compressor (108).

6. The ejector-enhanced absorption-compression high-temperature heat pump system according to claim 1, characterized in that: The refrigerant vapor evaporated in the high-pressure ejector generator (105) passes through the outlet of the intermediate heat exchanger (109).

7. The ejector-enhanced absorption-compression high-temperature heat pump system according to claim 1, characterized in that: The saturated liquid fluid at the liquid phase outlet of the intermediate heat exchanger (109) and the saturated gaseous fluid at the outlet of the generator (105) enter the ejector (106) and mix to form a gas-liquid two-phase mixed fluid. After reaching pressure balance, the gas-liquid two-phase mixed fluid enters the diffuser section of the ejector (106), and after being decelerated and pressurized in the diffuser section, enters the gas-liquid separator (107).

8. The ejector-enhanced absorption-compression high-temperature heat pump system according to claim 1, characterized in that: The generator (105) is connected to the ejector (106), the outlet of the ejector (106) is connected to the inlet of the gas-liquid separator (107), the gas phase outlet of the gas-liquid separator (107) is connected to the compressor (108), and the liquid phase outlet of the gas-liquid separator (107) is connected to the working fluid pump (110).

9. An ejector-enhanced absorption-compression high-temperature heat pump system according to any one of claims 1 to 8, characterized in that: The gas phase fluid coming out of the gas-liquid separator (107) is pressurized by the compressor (108), and the pressurized fluid enters the intermediate heat exchanger (109) to release heat. The fluid after heat release enters the ejector (106) to eject the refrigerant vapor of the generator (105); the liquid phase fluid of the gas-liquid separator (107) is pressurized by the working fluid pump (110), and the pressurized fluid enters the intermediate heat exchanger (109) to absorb heat. The refrigerant vapor after absorbing heat returns to the absorber (101) to complete the compression circuit cycle.

10. The ejector-enhanced absorption-compression high-temperature heat pump system according to claim 9, characterized in that: The concentrated refrigerant solution in the absorber (101) releases heat through the solution heat exchanger (102) and then enters the expansion valve (103) to reduce the pressure. The reduced-pressure solution enters the generator (105) to absorb heat and separate. The separated absorbent enters the solution pump (104) to increase the pressure and then enters the solution heat exchanger (102) to absorb heat. The dilute refrigerant solution after absorbing heat returns to the absorber (101) to complete the solution loop circulation.

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