Injection boosting organic Rankine cycle combined cooling and power generation system and method thereof

Abstract

The invention relates to the technical field of low-grade heat utilization, in particular to a jet boosting organic Rankine cycle combined cooling and power generation system and a jet boosting organic Rankine cycle combined cooling and power generation method. The system comprises a generator, a condenser, a working medium pump, a supersonic vapor-liquid two-phase flow ejector, a first evaporator, an expansion machine, a generator, a first throttling valve, a second evaporator, an absorber, a solution pump, a solution heat exchanger and a second throttling valve which are sequentially connected to form a loop. The organic Rankine cycle and the absorption refrigeration cycle are coupled to reduce the pressure of an outlet of an expansion machine, meanwhile, the supersonic vapor-liquid two-phase flow ejector is used for assisting in boosting to save part of consumed power of a power generation side working medium pump, and heat energy of part of superheated steam at an outlet of an absorption refrigeration subsystem generator is recycled; cogeneration is achieved while the heat efficiency is improved, and high technical economy is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-grade heat utilization, and in particular to a jet-boosted organic Rankine cycle cooling and power cogeneration system and method thereof. Background Art

[0002] As the energy supply situation becomes increasingly tense, the organic Rankine cycle has received more and more attention as an effective low-temperature thermal power generation technology. However, due to the relatively small temperature difference between the cold and hot sources, the thermal efficiency of the organic Rankine cycle power generation system is relatively low. Existing research shows that under certain heat source parameters, the ability of the working fluid in the expander to do work depends largely on the back pressure at the expander outlet, that is, the condensation pressure, which in turn depends on the condensation temperature. Low-temperature thermal power generation systems usually use water or air as cooling media. Affected by the ambient temperature, these natural cooling media are difficult to reduce the condensation temperature of the power generation system to below the ambient temperature. Therefore, reducing the condensation pressure / temperature of the power generation system is an important direction to improve thermal efficiency.

[0003] Regarding reducing the condensing pressure of the power generation system, the current solutions are: (1) using buried pipe cooling, such as the literature (Mahmoud et al. Energy, 2022, 249, 123742) proposed using buried pipes as the condenser of the organic Rankine cycle. This solution has problems such as difficulty in modularizing the generator set, complex construction, and long cycle. There is also a risk of heat accumulation underground, so the long-term performance of the power generation system is difficult to meet expectations; (2) Using refrigeration equipment to provide cooling resources for the low-temperature thermal power generation system so that the condensing temperature of the power generation system is lower than the ambient temperature. For example, patent (TWI755021B) and literature (Liu Jiayu. Changsha: Central South University, 2022) proposed combining the organic Rankine cycle with the absorption refrigeration cycle. Literature (Sarr et al. Energy Conversion and Management, 2016, 121, 358-379) proposed combining the organic Rankine cycle with the vapor compression refrigeration cycle. Their common feature is that both use the chilled water produced in the evaporator of the refrigeration subsystem as the cooling water of the organic Rankine cycle. Although this measure can improve thermal efficiency, it leads to a decrease in the net output power of the power generation system and significantly increases the investment cost, making the economic efficiency worrying. Therefore, the existing related technologies need to be further improved and developed. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an injection-boosted organic Rankine cycle cogeneration system and method thereof, which couples the organic Rankine cycle with an absorption refrigeration cycle to reduce the outlet pressure of the expander, and simultaneously utilizes a supersonic vapor-liquid two-phase flow ejector to save part of the power consumption of the working fluid pump of the organic Rankine cycle subsystem and recover the thermal energy of part of the superheated steam at the generator outlet, thereby achieving cogeneration of cooling and power while improving thermal efficiency.

[0005] To achieve the above objectives, the first objective of the present invention is to provide a jet boost organic Rankine cycle cooling and power cogeneration system, comprising a generator, a condenser, a second evaporator, an absorber, a solution heat exchanger, an ejector, a first evaporator, an expander, and a generator.

[0006] Among them, the refrigerant vapor outlet of the generator is divided into two branches, the first branch is connected to the inlet of the condenser, and the second branch is connected to the injection fluid inlet of the ejector; one branch of the condenser outlet is connected to the working fluid inlet of the ejector, and the other branch is connected to the refrigerant vapor inlet of the absorber through the second evaporator; the outlet of the ejector is connected to the refrigerant vapor inlet of the absorber after passing through the first evaporator and the expander in sequence; the expander is connected to the generator through a coupling; the solution outlet of the absorber is connected to the solution inlet of the generator through a solution heat exchanger; the solution outlet of the generator is connected to the solution inlet of the absorber through a solution heat exchanger.

[0007] In the above-mentioned jet-boosted organic Rankine cycle cogeneration system, further, the ejector is a supersonic vapor-liquid two-phase flow ejector.

[0008] The jet-boosted organic Rankine cycle cooling and power cogeneration system as described above further includes a working fluid pump, and the outlet of the condenser is connected to the working fluid inlet of the supersonic vapor-liquid two-phase flow ejector through the working fluid pump.

[0009] The injection boost organic Rankine cycle cogeneration system as described above further includes a first throttle valve, and the other path of the condenser is connected to the refrigerant vapor inlet of the absorber through the first throttle valve and the second evaporator in sequence.

[0010] The jet boost organic Rankine cycle cogeneration system as described above further comprises a solution pump, and the solution outlet of the absorber is connected to the solution inlet of the generator through the solution pump and the solution heat exchanger in sequence.

[0011] The jet boost organic Rankine cycle combined cooling and power system as described above further includes a second throttle valve, and the solution outlet of the generator is connected to the solution inlet of the absorber through the solution heat exchanger and the second throttle valve in sequence.

[0012] Another object of the present invention is to provide a jet-boosted organic Rankine cycle combined cooling and power generation method, using the jet-boosted organic Rankine cycle combined cooling and power generation system as described above, comprising the steps of:

[0013] The concentrated solution in the generator is heated by an external low-grade heat source to produce refrigerant vapor and a dilute solution; the refrigerant vapor is divided into two fluids, namely, the first refrigerant vapor and the second refrigerant vapor, wherein the first refrigerant vapor enters the condenser and is condensed into a liquid refrigerant in the condenser, and the second refrigerant vapor enters the supersonic vapor-liquid two-phase flow ejector as an ejection fluid; the liquid refrigerant is divided into two fluids, namely, the first liquid refrigerant and the second liquid refrigerant, wherein the first liquid refrigerant is pressurized by a working fluid pump and is passed into the supersonic vapor-liquid two-phase flow ejector as a working fluid to eject the second refrigerant vapor, and the working fluid and the ejection fluid are fully mixed in the supersonic vapor-liquid two-phase flow ejector to form a subcooled high-pressure fluid and enter the first evaporator;

[0014] The high-pressure cold refrigerant is heated by the low-grade heat source in the first evaporator to form saturated or superheated vapor, and enters the expander to do work, driving the generator connected to it through the coupling to operate and generate electricity; the second liquid refrigerant coming out of the condenser is reduced in pressure to the evaporation pressure by the throttle valve and enters the second evaporator, where it absorbs heat and evaporates to form refrigerant vapor and produces a refrigeration effect. The refrigerant vapor then merges with the refrigerant exhaust steam of the expander and enters the absorber;

[0015] The refrigerant vapor after confluence is absorbed by the dilute solution from the generator and reduced in pressure by the second throttle valve in the absorber to form a concentrated solution. Subsequently, under the pressure-boosting action of the solution pump, it exchanges heat with the dilute solution from the generator through the solution heat exchanger. The concentrated solution after heat exchange is passed into the generator to complete the system cycle.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention adopts a supersonic steam-liquid two-phase flow ejector to assist in boosting the pressure, which not only saves part of the power consumption of the organic Rankine cycle working fluid pump, but also acts as a regenerator to recover the heat energy of part of the superheated steam at the generator outlet, making more effective use of the low-grade heat source.

[0018] (2) The present invention couples the organic Rankine cycle with the absorption refrigeration cycle through a supersonic vapor-liquid two-phase flow ejector and an absorber. The absorber also serves as a condenser of the organic Rankine cycle, effectively increasing the inlet and outlet pressure difference of the organic Rankine cycle expander, thereby improving the thermal efficiency of the organic Rankine cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 The schematic diagram is a structural diagram of a jet-boosted organic Rankine cycle combined cooling and power system according to an embodiment of the present invention.

[0021] 1. Generator; 1a. Solution inlet of generator; 1b. Refrigerant vapor outlet of generator; 1c. Solution outlet of generator; 2. Condenser; 2a. Condenser inlet; 2b. Condenser outlet; 3. First throttle valve; 4. Second evaporator; 5. Absorber; 5a. Refrigerant vapor inlet of absorber; 5b. Solution inlet of absorber; 5c. Solution outlet of absorber; 6. Solution pump; 7. Solution heat exchanger; 8. Second throttle valve; 9. Working fluid pump; 10. Ejector; 10a. Working fluid inlet of supersonic vapor-liquid two-phase flow ejector; 10b. Injection fluid inlet of supersonic vapor-liquid two-phase flow ejector; 10c. Outlet of supersonic vapor-liquid two-phase flow ejector; 11. First evaporator; 12. Expander; 13. Generator. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] Example:

[0024] 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 data 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. In addition, the terms "including" and "having" and any variations of the embodiments of the present invention are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise clearly defined. In addition, unless otherwise clearly defined and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] See also Figure 1 The embodiment of the present invention provides an ejector-boosted organic Rankine cycle cooling and power cogeneration system, comprising a generator 1, a condenser 2, a second evaporator 4, an absorber 5, a solution heat exchanger 7, an ejector 10, a first evaporator 11, an expander 12, and a generator 13, wherein the refrigerant vapor outlet 1b of the generator 1 is divided into two branches, the first branch is connected to the inlet 2a of the condenser 2, and the second branch is connected to the ejector fluid inlet 10b; the outlet 2b of the condenser 2 is connected to the working fluid inlet 10a of the ejector in one way, and the other way is connected to the refrigerant vapor inlet 5a of the absorber 5 through the second evaporator 4; the outlet of the ejector is connected to the refrigerant vapor inlet 5a of the absorber 5 after passing through the first evaporator 11 and the expander 12 in sequence; the expander 12 is connected to the generator 13 through a coupling; the solution outlet 5c of the absorber 5 is connected to the solution inlet 1a of the generator 1 through the solution heat exchanger 7; the solution outlet 1c of the generator 1 is connected to the solution inlet 5b of the absorber 5 through the solution heat exchanger 7.

[0027] In certain embodiments, the ejector 10 is a supersonic vapor-liquid two-phase flow ejector.

[0028] In some embodiments, a working fluid pump 9 is further included, and the outlet 2 b of the condenser 2 is connected to the working fluid inlet 10 a of the supersonic vapor-liquid two-phase flow ejector 10 through the working fluid pump 9 .

[0029] In some embodiments, a first throttle valve 3 is further included, and another path of the condenser 2 is connected to a refrigerant vapor inlet 5a of the absorber 5 through the first throttle valve 3 and the second evaporator 4 in sequence.

[0030] In some embodiments, a solution pump 6 is further included, and the solution outlet 5c of the absorber 5 is connected to the solution inlet 1a of the generator 1 through the solution pump 6 and the solution heat exchanger 7 in sequence.

[0031] In some embodiments, a second throttle valve 8 is further included, and the solution outlet 1 c of the generator 1 is connected to the solution inlet 5 b of the absorber 5 through the solution heat exchanger 7 and the second throttle valve 8 in sequence.

[0032] In some embodiments, the condenser 2, the first evaporator 11, the second evaporator 4, the absorber 5, the generator 1 and the solution heat exchanger 7 may be falling film, shell and tube or plate heat exchangers, or other forms of heat exchangers.

[0033] In some embodiments, the expander 12 may be a conventional turbine expander, a screw expander or a scroll expander, or may be an expander of other forms. The generator 13 may be a synchronous generator or an asynchronous generator.

[0034] As a preferred example, a jet boost organic Rankine cycle cooling and power cogeneration system includes a generator 1, a condenser 2, a working fluid pump 9, a supersonic vapor-liquid two-phase flow ejector 10, a first evaporator 11, an expander 12, a generator 13, a first throttle valve 3, a second evaporator 4, an absorber 5, a solution pump 6, a solution heat exchanger 7 and a second throttle valve 8; the refrigerant vapor outlet 1b of the generator 1 is divided into two branches, the first branch is connected to the inlet 2a of the condenser 2, and the second branch is connected to the injection fluid inlet 10b of the supersonic vapor-liquid two-phase flow ejector 10; the outlet 2b of the condenser 2 is connected to the supersonic vapor-liquid two-phase flow ejector 10 through the working fluid pump 9. The working fluid inlet 10a of the absorber 10 is connected, and the other way is connected to the refrigerant vapor inlet 5a of the absorber 5 through the first throttle valve 3 and the second evaporator 4 in sequence; the outlet 10c of the supersonic vapor-liquid two-phase flow ejector is connected to the refrigerant vapor inlet 5a of the absorber 5 through the first evaporator 11 and the expander 12 in sequence; the expander 12 is connected to the generator 13 through a coupling; the solution outlet 5c of the absorber 5 is connected to the solution inlet 1a of the generator through the solution pump 6 and the solution heat exchanger 7 in sequence; the solution outlet 1c of the generator 1 is connected to the solution inlet 5b of the absorber through the solution heat exchanger 7 and the second throttle valve 8 in sequence.

[0035] The supersonic steam-liquid two-phase flow ejector 10 is used to assist the pressure increase, which not only saves part of the power consumption of the organic Rankine cycle working fluid pump 9, but also acts as a regenerator to recover the heat energy of part of the superheated steam at the outlet of the generator 1.

[0036] The organic Rankine cycle is coupled with the absorption refrigeration cycle through the supersonic vapor-liquid two-phase flow ejector 10 and the absorber 5. The absorber 5 also serves as a condenser of the organic Rankine cycle, which effectively increases the inlet and outlet pressure difference of the organic Rankine cycle expander 12, thereby improving the thermal efficiency of the organic Rankine cycle.

[0037] The embodiment of the present invention further provides a jet boost organic Rankine cycle cooling and power cogeneration method, using the jet boost organic Rankine cycle cooling and power cogeneration system as described above, comprising the steps of:

[0038] Step 1: The concentrated solution in the generator 1 is heated by an external low-grade heat source to generate refrigerant vapor and a dilute solution; the refrigerant vapor is divided into two fluids, namely, the first refrigerant vapor and the second refrigerant vapor, wherein the first refrigerant vapor enters the condenser 2 and is condensed into a liquid refrigerant in the condenser 2, and the second refrigerant vapor enters the supersonic vapor-liquid two-phase flow ejector 10 as an ejection fluid; the liquid refrigerant is divided into two fluids, namely, the first liquid refrigerant and the second liquid refrigerant, wherein the first liquid refrigerant is pressurized by the working fluid pump 9 and is passed into the supersonic vapor-liquid two-phase flow ejector 10 as a working fluid to eject the second refrigerant vapor, and the working fluid and the ejection fluid are fully mixed in the supersonic vapor-liquid two-phase flow ejector 10 to form a supercooled high-pressure fluid and enter the first evaporator 11;

[0039] Step 2: The high-pressure cold refrigerant is heated by a low-grade heat source in the first evaporator 11 to form saturated or superheated vapor, and enters the expander 12 to perform work, driving the generator 13 connected to it through a coupling to operate and generate electricity; the second liquid refrigerant coming out of the condenser 2 is reduced in pressure to the evaporation pressure by a throttle valve and enters the second evaporator 4, where it absorbs heat and evaporates to form refrigerant vapor and produces a refrigeration effect, and the refrigerant vapor then merges with the refrigerant exhaust steam of the expander 12 and enters the absorber 5;

[0040] Step 3: The merged refrigerant vapor is absorbed in the absorber 5 by the dilute solution from the generator 1 and reduced in pressure by the second throttle valve 8 to form a concentrated solution. Subsequently, under the pressure-boosting effect of the solution pump 6, the concentrated solution is exchanged with the dilute solution from the generator 1 through the solution heat exchanger 7. The concentrated solution after heat exchange is introduced into the generator 1 to complete the system cycle.

[0041] The concentrated solution is a mixed solution of organic working fluids rich in refrigerant, and the corresponding refrigerant-lean solution is referred to as a dilute solution.

[0042] The organic working fluid mixed solution includes low-boiling point organic matter as a refrigerant and high-boiling point organic matter as an absorbent. The refrigerant can be selected from one or more of R245fa (pentafluoropropane), R1233zd (E) (trans-1-chloro-3,3,3-trifluoropropene), R1234ze (E) (trans-1,3,3,3-tetrafluoropropene) and R1234ze (Z) (cis-1,3,3,3-tetrafluoropropene), and other low-boiling point organic working fluids can also be used as refrigerants; the absorbent can be selected from one or more of TrEGDME (triethylene glycol dimethyl ether), E181 (tetraethylene glycol dimethyl ether), DMAC (dimethylacetamide) and NMP (N-methylpyrrolidone), and other high-boiling point organic working fluids can also be used as absorbents.

[0043] As a preferred example, the working principle of the embodiment of the present invention is described below using R1233zd(E) / E181 solution as a circulating working fluid:

[0044] The R1233zd(E) / E181 concentrated solution in the generator 1 is heated by an external heat source to produce R1233zd(E) vapor and R1233zd(E) / E181 dilute solution; the R1233zd(E) superheated vapor flowing out of the generator 1 is divided into two streams, the first R1233zd(E) superheated vapor enters the condenser 2 and is cooled by an external cooling medium such as natural water or air to become a liquid working medium with a certain degree of supercooling; then the R1233zd(E) liquid is divided into two streams, the first R1233zd(E) liquid is pressurized by the working medium pump 9 and then The working fluid is introduced into the supersonic vapor-liquid two-phase flow ejector 10, and forms a supersonic jet after passing through the supersonic nozzle. The second R1233zd (E) superheated steam flowing out of the generator 1 enters the variable cross-section mixing chamber of the supersonic vapor-liquid two-phase flow ejector 10 under the induced action of the supersonic jet, wherein the two fluids directly contact to form a supersonic vapor-liquid two-phase flow, and a condensation shock wave is generated under the condition of flow obstruction to achieve a sudden pressure change, and a supercooled liquid R1233zd (E) with a pressure slightly higher than the outlet pressure of the working fluid pump 9 is obtained, and then the supersonic vapor-liquid two-phase flow ejector 10 is discharged from the outlet of the supersonic vapor-liquid two-phase flow ejector 10. The second liquid refrigerant flows out of the condenser 2 and enters the first evaporator 11, where it is heated to saturated vapor or superheated vapor by an external low-grade heat source and then enters the expander 12. The R1233zd(E) vapor expands and performs work in the expander 3, driving the generator 13 connected to it through a coupling to operate and generate electricity. The second liquid refrigerant flows out of the condenser 2 and is reduced in pressure to the evaporation pressure by the throttle valve 3 and then enters the second evaporator 4, where it absorbs heat and evaporates to form R1233zd(E) vapor and produces a refrigeration effect. The R1233zd(E) vapor then merges with the exhaust steam flowing out of the expander 12 and enters the absorber 5. After merging, The R1233zd(E) vapor is absorbed in the absorber 5 by the R1233zd(E) / E181 dilute solution from the generator 1 and reduced in pressure by the second throttle valve 8. The heat generated during the absorption process is cooled by an external cooling medium such as natural water or air to eventually form a R1233zd(E) / E181 concentrated solution. Subsequently, under the pressure-boosting effect of the solution pump 6, the solution heat exchanger 7 exchanges heat with the R1233zd(E) / E181 dilute solution from the generator 1. The R1233zd(E) / E181 concentrated solution after heat exchange is introduced into the generator 1 to complete the system cycle.

[0045] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0048] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable ordinary technicians in the field to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made based on the essence of the content of the present invention should be included in the protection scope of the present invention.

Claims

1. A jet boost organic Rankine cycle cooling and power cogeneration system, characterized in that: It includes a generator, a condenser, a second evaporator, an absorber, a solution heat exchanger, an ejector, a first evaporator, an expander, and a generator. Among them, the refrigerant vapor outlet of the generator is divided into two branches, the first branch is connected to the inlet of the condenser, and the second branch is connected to the injection fluid inlet of the ejector; one branch of the condenser outlet is connected to the working fluid inlet of the ejector, and the other branch is connected to the refrigerant vapor inlet of the absorber through the second evaporator; the outlet of the ejector is connected to the refrigerant vapor inlet of the absorber after passing through the first evaporator and the expander in sequence; the expander is connected to the generator through a coupling; the solution outlet of the absorber is connected to the solution inlet of the generator through a solution heat exchanger; the solution outlet of the generator is connected to the solution inlet of the absorber through a solution heat exchanger.

2. The jet boost organic Rankine cycle combined cooling and power system according to claim 1, characterized in that: The ejector is a supersonic vapor-liquid two-phase flow ejector.

3. The jet boost organic Rankine cycle combined cooling and power system according to claim 1, characterized in that: It also includes a working fluid pump, and the outlet of the condenser is connected to the working fluid inlet of the supersonic vapor-liquid two-phase flow ejector through the working fluid pump.

4. The jet boost organic Rankine cycle combined cooling and power system according to claim 1, characterized in that: It also includes a first throttle valve, and the other path of the condenser is connected to the refrigerant vapor inlet of the absorber through the first throttle valve and the second evaporator in sequence.

5. The jet boost organic Rankine cycle combined cooling and power system according to claim 1, characterized in that: It also includes a solution pump, and the solution outlet of the absorber is connected to the solution inlet of the generator through the solution pump and the solution heat exchanger in sequence.

6. The jet boost organic Rankine cycle combined cooling and power system according to claim 1, characterized in that: It also includes a second throttle valve, and the solution outlet of the generator is connected to the solution inlet of the absorber through the solution heat exchanger and the second throttle valve in sequence.

7. A jet boost organic Rankine cycle cooling and power cogeneration method, characterized in that: The jet boost organic Rankine cycle cooling and power cogeneration system according to any one of claims 1 to 6 comprises the following steps: The concentrated solution in the generator is heated by an external low-grade heat source to produce refrigerant vapor and dilute solution; The refrigerant vapor is divided into two fluids, namely, the first refrigerant vapor and the second refrigerant vapor, wherein the first refrigerant vapor enters the condenser and is condensed into a liquid refrigerant in the condenser, and the second refrigerant vapor enters the supersonic vapor-liquid two-phase flow ejector as an ejection fluid; the liquid refrigerant is divided into two fluids, namely, the first liquid refrigerant and the second liquid refrigerant, wherein the first liquid refrigerant is pressurized by a working fluid pump and is passed into the supersonic vapor-liquid two-phase flow ejector as a working fluid to eject the second refrigerant vapor, and the working fluid and the ejection fluid are fully mixed in the supersonic vapor-liquid two-phase flow ejector to form a subcooled high-pressure fluid and enter the first evaporator; The high-pressure cold refrigerant is heated by the low-grade heat source in the first evaporator to form saturated or superheated vapor, and enters the expander to do work, driving the generator connected to it through the coupling to operate and generate electricity; the second liquid refrigerant coming out of the condenser is reduced in pressure to the evaporation pressure by the throttle valve and enters the second evaporator, where it absorbs heat and evaporates to form refrigerant vapor and produces a refrigeration effect. The refrigerant vapor then merges with the refrigerant exhaust steam of the expander and enters the absorber; The refrigerant vapor after confluence is absorbed by the dilute solution from the generator and reduced in pressure by the second throttle valve in the absorber to form a concentrated solution. Subsequently, under the pressure-boosting action of the solution pump, it exchanges heat with the dilute solution from the generator through the solution heat exchanger. The concentrated solution after heat exchange is passed into the generator to complete the system cycle.

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