Indirect double-effect jet type heat pump system

Abstract

The utility model relates to an indirect double-effect jet type heat pump system which comprises a first-stage heat pump loop and a second-stage heat pump loop, the first-stage heat pump loop comprises a first generator, a first ejector, a first economizer, a first gas-liquid separator, a first liquid storage tank and a first evaporator which are connected in sequence; the first generator is connected with a waste water heat source to form a heat extraction loop, the second-stage heat pump loop comprises a second generator, a second ejector, a second economizer, a second gas-liquid separator, a second liquid storage tank and a second evaporator which are sequentially connected, and the second generator is connected in a pipeline between the first gas-liquid separator and the first liquid storage tank in series; the pipeline between the second gas-liquid separator and the second liquid storage tank is connected with a condenser in series, the condenser is connected with the heat supply tail end to form a heat supply loop, the first evaporator and the second evaporator are connected with each other and are correspondingly connected with a smoke heat source and an exhaust pipe, and the system has the advantages of being convenient to operate and control and good in stability.

Description

Technical Field

[0001] This utility model relates to a heat pump system, specifically to an indirect double-effect jet heat pump system with two-stage heat pumps connected in series. Background Technology

[0002] With economic and social development, the importance of energy conservation is becoming increasingly prominent. However, large amounts of high-temperature wastewater (low-grade heat energy) generated during industrial development are often discharged directly into the environment without energy recovery, resulting in energy waste. Simultaneously, the flue gas (exhaust gas) produced by gas-fired boilers contains a large amount of latent heat, most of which is also directly emitted, similarly causing energy waste and contributing to thermal pollution. Heat pumps, as air conditioning or heating devices, have certain technological advantages in the recovery and utilization of industrial waste heat (high-temperature wastewater, flue gas), generating significant economic benefits. Compared to traditional heat pumps, jet heat pumps utilize ejectors instead of compressors, offering advantages such as simple structure, reliable operation, high thermal efficiency, and energy savings. However, jet heat pumps operate using a high-grade heat source as the driving force and supply heat by recovering heat from a low-grade heat source. Due to the large temperature difference between the high-grade and low-grade heat sources, the expansion ratio (mainstream fluid pressure / secondary fluid pressure) and shock wave losses of jet heat pumps are relatively large, affecting ejector efficiency and the overall system COP. Utility Model Content

[0003] The purpose of this invention is to provide an indirect dual-effect jet heat pump system, which has the advantages of simple structure, convenient operation, good stability and high safety.

[0004] To address the aforementioned problems in the existing technology, this utility model provides an indirect double-effect jet heat pump system, comprising a first generator, a first ejector, a first economizer, a first gas-liquid separator, a first liquid storage tank, a first evaporator, a second generator, a second ejector, a second economizer, a second gas-liquid separator, a second liquid storage tank, a second evaporator, and a condenser. The primary side of the first generator is connected to a wastewater heat source to form a heat extraction circuit. The secondary side outlet of the first generator is connected to the main flow inlet of the first ejector via a first working fluid pipeline. The outlet of the first ejector is connected to the primary side inlet of the first economizer via a second working fluid pipeline. The primary side outlet of the first economizer is connected to a third working fluid pipeline. The pipeline is connected to the inlet of the first gas-liquid separator. The liquid and gas outlets of the first gas-liquid separator are connected to the first liquid storage tank via the fourth and fifth working fluid pipelines, respectively. The first liquid storage tank is connected to the secondary inlet of the first economizer and the secondary inlet of the first evaporator via the sixth and seventh working fluid pipelines, respectively. The sixth and seventh working fluid pipelines are equipped with a first working fluid pump and a first throttling valve, respectively. The secondary outlet of the first economizer is connected to the secondary inlet of the first generator via the eighth working fluid pipeline. The secondary outlet of the first evaporator is connected to the secondary inlet of the first injector via the ninth working fluid pipeline. The primary inlet of the first evaporator is connected to the flue gas heat source. The primary side outlet of the first evaporator is connected to the primary side inlet of the second evaporator. The primary side outlet of the second evaporator is connected to an exhaust pipe. The primary side of the second generator is connected in series in the fifth working fluid pipeline. The secondary side outlet of the second generator is connected to the main flow inlet of the second injector via the tenth working fluid pipeline. The outlet of the second injector is connected to the primary side inlet of the second economizer via the eleventh working fluid pipeline. The primary side outlet of the second economizer is connected to the inlet of the second gas-liquid separator via the twelfth working fluid pipeline. The liquid and gas phase outlets of the second gas-liquid separator are connected to the second liquid storage tank via the thirteenth and fourteenth working fluid pipelines, respectively. The second liquid storage tank is connected to the second liquid storage tank via the fifteenth and tenth working fluid pipelines. The sixth working fluid pipeline is connected to the secondary side inlet of the second economizer and the secondary side inlet of the second evaporator. The fifteenth and sixteenth working fluid pipelines are equipped with the second working fluid pump and the second throttle valve respectively. The secondary side outlet of the second economizer is connected to the secondary side inlet of the second generator through the seventeenth working fluid pipeline. The secondary side outlet of the second evaporator is connected to the secondary flow inlet of the second ejector through the eighteenth working fluid pipeline. The primary side of the condenser is connected in series in the fourteenth working fluid pipeline. The secondary side of the condenser is connected to the heating terminal to form a heating circuit. It also includes control devices that are respectively connected to the first ejector, the second ejector, the first working fluid pump, the first throttle valve, the second working fluid pump, and the second throttle valve.

[0005] Optionally, the present invention provides an indirect double-effect jet heat pump system, which further includes a subcooler. The primary side of the subcooler is connected to a cold water source to form a cooling circuit, and the secondary side of the subcooler is connected in series in a seventh working fluid pipeline.

[0006] Furthermore, in this utility model, an indirect double-effect jet heat pump system is provided, wherein the first throttling valve is installed on the seventh working fluid pipeline between the subcooler and the first evaporator.

[0007] Optionally, the present invention provides an indirect double-effect jet heat pump system, which further includes a subcooler, wherein the primary side of the subcooler is connected in series in the eighteenth working fluid pipeline, and the secondary side of the subcooler is connected in series in the sixteenth working fluid pipeline.

[0008] Furthermore, in this utility model, an indirect double-effect jet heat pump system is provided, wherein the second throttling valve is installed on the sixteenth working fluid pipeline between the subcooler and the second evaporator.

[0009] Furthermore, in this utility model, an indirect double-effect jet heat pump system is provided, wherein temperature sensors T1 and T2 are respectively provided on the two ports of the primary side of the first generator, and temperature sensors T3 and T4 are respectively provided on the two ports of the secondary side of the condenser.

[0010] Furthermore, in this utility model, an indirect dual-effect jet heat pump system is provided, wherein the main inlet of the first ejector is equipped with a temperature sensor T5 and a pressure sensor P1, and the outlet of the first ejector is equipped with a pressure sensor P2.

[0011] Furthermore, in this utility model, an indirect dual-effect jet heat pump system is provided, wherein the main inlet of the second ejector is equipped with a temperature sensor T6 and a pressure sensor P3, and the outlet of the second ejector is equipped with a pressure sensor P4.

[0012] Furthermore, in this utility model, an indirect double-effect jet heat pump system is provided, wherein a temperature sensor T7 is provided at the primary side inlet of the first evaporator, and a temperature sensor T8 is provided at the primary side outlet of the second evaporator.

[0013] Compared with existing technologies, this utility model of an indirect double-effect jet heat pump system has the following advantages: This utility model, by setting up a first generator, a first ejector, a first economizer, a first gas-liquid separator, a first liquid storage tank, a first evaporator, a second generator, a second ejector, a second economizer, a second gas-liquid separator, a second liquid storage tank, a second evaporator, and a condenser, connects the primary side of the first generator to a wastewater heat source to form a heat extraction circuit. The secondary side outlet of the first generator is connected to the main flow inlet of the first ejector through a first working fluid pipeline, and the outlet of the first ejector is connected to the primary side inlet of the first economizer through a second working fluid pipeline. The primary outlet is connected to the inlet of the first gas-liquid separator via the third working fluid pipeline. The liquid and gas outlets of the first gas-liquid separator are connected to the first liquid storage tank via the fourth and fifth working fluid pipelines, respectively. The first liquid storage tank is connected to the secondary inlet of the first economizer and the secondary inlet of the first evaporator via the sixth and seventh working fluid pipelines, respectively. The secondary outlet of the first economizer is connected to the secondary inlet of the first generator via the eighth working fluid pipeline. The secondary outlet of the first evaporator is connected to the secondary inlet of the first ejector via the ninth working fluid pipeline. The sixth and seventh working fluid pipelines are respectively equipped with a first working fluid pump and... The first throttle valve connects the primary side inlet of the first evaporator to the flue gas heat source, and the primary side outlet of the first evaporator connects to the primary side inlet of the second evaporator. The primary side outlet of the second evaporator is connected to an exhaust pipe. The primary side of the second generator is connected in series in the fifth working fluid pipeline. The secondary side outlet of the second generator is connected to the main flow inlet of the second injector via the tenth working fluid pipeline. The outlet of the second injector is connected to the primary side inlet of the second economizer via the eleventh working fluid pipeline. The primary side outlet of the second economizer is connected to the inlet of the second gas-liquid separator via the twelfth working fluid pipeline. The liquid and gas phase outlets of the second gas-liquid separator are connected to the thirteenth working fluid pipeline. The first and fourteenth working fluid pipelines are connected to the second storage tank. The second storage tank is connected to the secondary inlet of the second economizer and the secondary inlet of the second evaporator via the fifteenth and sixteenth working fluid pipelines, respectively. The secondary outlet of the second economizer is connected to the secondary inlet of the second generator via the seventeenth working fluid pipeline. The secondary outlet of the second evaporator is connected to the secondary inlet of the second ejector via the eighteenth working fluid pipeline. The fifteenth and sixteenth working fluid pipelines are equipped with a second working fluid pump and a second throttling valve, respectively. The primary side of the condenser is connected in series with the fourteenth working fluid pipeline, and the secondary side of the condenser is connected to the heating terminal to form a heating circuit. For ease of control, control devices are also provided, connected to the first ejector, the second ejector, the first working fluid pump, the first throttling valve, the second working fluid pump, and the second throttling valve, respectively. This constitutes a simple, easy-to-operate, stable, and safe indirect double-effect jet heat pump system.In practical applications, after the system is started, the heat extraction circuit, the heating circuit, the primary heat pump circuit, and the secondary heat pump circuit will operate in a cycle. Flue gas will continuously flow through the primary side of the first and second evaporators. The fluid in the heat extraction circuit is wastewater, the fluid in the heating circuit is water or antifreeze (referred to as the heating fluid), and the fluid in the primary and secondary heat pump circuits is refrigerant. When the system is running, the wastewater will continuously transfer heat to the refrigerant through the first generator, the flue gas will continuously transfer heat to the refrigerant through the first and second evaporators, the refrigerant will continuously transfer heat to the heating fluid through the condenser, and the heating fluid will continuously transfer heat to the heating terminal through the heating circuit. This invention utilizes a two-stage jet heat pump with indirect connection. The first generator recovers heat energy from wastewater and uses it as driving force. The first and second evaporators recover heat energy from flue gas and use it as heat for the secondary refrigerant in the vaporizing ejector, achieving deep recovery and utilization of industrial waste heat. The first and second economizers exchange heat with the refrigerant flowing through them, reducing irreversible losses caused by temperature differences in the first and second generators and condenser. Compared to existing jet heat pump systems, this invention reduces the expansion ratio of individual ejectors, minimizes internal ejector losses, achieves cascaded energy utilization, and improves ejector efficiency and overall system COP.

[0014] The following describes in detail an indirect double-effect jet heat pump system of the present invention with reference to the embodiments shown in the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first embodiment of an indirect double-effect jet heat pump system according to the present invention.

[0016] Figure 2 This is a schematic diagram of the second embodiment of an indirect double-effect jet heat pump system according to the present invention.

[0017] Figure 3 This is a schematic diagram of the third embodiment of an indirect double-effect jet heat pump system according to the present invention. Detailed Implementation

[0018] First, it should be noted that the directional terms such as up, down, left, right, front, and back mentioned in this utility model are only descriptions based on the accompanying drawings for ease of understanding, and are not intended to limit the technical solution or the scope of protection claimed in this utility model.

[0019] like Figure 1The first embodiment of the indirect double-effect jet heat pump system of the present invention shown includes a first generator 1, a first ejector 2, a first economizer 3, a first gas-liquid separator 4, a first liquid storage tank 5, a first evaporator 6, a second generator 7, a second ejector 8, a second economizer 9, a second gas-liquid separator 10, a second liquid storage tank 11, a second evaporator 12, and a condenser 13. The primary side of the first generator 1 is connected to the wastewater heat source to form a heat extraction circuit. The secondary side outlet of the first generator 1 is connected to the main flow inlet of the first ejector 2 through the first working fluid pipeline 14. The outlet of the first ejector 2 is connected to the primary side inlet of the first economizer 3 through the second working fluid pipeline 15. The primary side outlet of the first economizer 3 is connected to the inlet of the first gas-liquid separator 4 through the third working fluid pipeline 16. The liquid phase outlet and gas phase outlet of the first gas-liquid separator 4 are connected to the first liquid storage tank 5 through the fourth working fluid pipeline 17 and the fifth working fluid pipeline 18, respectively. The first liquid storage tank 5 is connected to the first liquid storage tank 5 through the sixth working fluid pipeline 19 and the seventh working fluid pipeline 20, respectively. The secondary inlet of the first economizer 3 is connected to the secondary inlet of the first evaporator 6. The secondary outlet of the first economizer 3 is connected to the secondary inlet of the first generator 1 through the eighth working fluid pipeline 23. The secondary outlet of the first evaporator 6 is connected to the secondary inlet of the first injector 2 through the ninth working fluid pipeline 24. The sixth working fluid pipeline 19 and the seventh working fluid pipeline 20 are respectively equipped with a first working fluid pump 21 and a first throttle valve 22. The primary inlet of the first evaporator 6 is connected to the flue gas heat source. The primary outlet of the first evaporator 6 is connected to the primary inlet of the second evaporator 12. The primary outlet of the second evaporator 12 is connected to an exhaust pipe. The primary side of the second generator 7 is connected in series in the fifth working fluid pipeline 18. The secondary side outlet of the second generator 7 is connected to the main flow inlet of the second injector 8 through the tenth working fluid pipeline 25. The outlet of the second injector 8 is connected to the primary side inlet of the second economizer 9 through the eleventh working fluid pipeline 26. The primary side outlet of the second economizer 9 is connected to the inlet of the second gas-liquid separator 10 through the twelfth working fluid pipeline 27. The liquid phase outlet and gas phase outlet of the second gas-liquid separator 10 are connected to the second liquid storage tank 11 through the thirteenth and fourteenth working fluid pipelines 28 and 29, respectively. The second liquid storage tank 11 is connected to the second liquid storage tank 11 through the fifteenth working fluid pipeline 30. The sixteenth working fluid pipeline 31 is connected to the secondary side inlet of the second economizer 9 and the secondary side inlet of the second evaporator 12. The secondary side outlet of the second economizer 9 is connected to the secondary side inlet of the second generator 7 through the seventeenth working fluid pipeline 34. The secondary side outlet of the second evaporator 12 is connected to the secondary flow inlet of the second ejector 8 through the eighteenth working fluid pipeline 35. The fifteenth working fluid pipeline 30 and the sixteenth working fluid pipeline 31 are respectively equipped with a second working fluid pump 32 and a second throttle valve 33. The primary side of the condenser 13 is connected in series in the fourteenth working fluid pipeline 29. The secondary side of the condenser 13 is connected to the heating terminal to form a heating circuit.For ease of control, control devices are also provided that are connected to the first injector 2, the second injector 8, the first working fluid pump 21, the first throttle valve 22, the second working fluid pump 32, and the second throttle valve 33 respectively.

[0020] The above configuration constitutes an indirect dual-effect jet heat pump system that is simple in structure, easy to operate, stable, and highly safe. In practical applications, after the system is started, the heat extraction circuit, heating circuit, primary heat pump circuit, and secondary heat pump circuit will circulate. Flue gas will continuously flow through the primary side of the first evaporator 6 and the second evaporator 12. The fluid in the heat extraction circuit is wastewater, the fluid in the heating circuit is water or antifreeze (referred to as the heating fluid), and the fluids in the primary and secondary heat pump circuits are refrigerant. During system operation, the wastewater continuously transfers heat to the refrigerant through the first generator 1, the flue gas continuously transfers heat to the refrigerant through the first evaporator 6 and the second evaporator 12, the refrigerant continuously transfers heat to the heating fluid through the condenser 13, and the heating fluid continuously transfers heat to the heating terminal through the heating circuit. This invention utilizes a two-stage jet heat pump with indirect connection. It recovers heat energy from wastewater using a first generator 1 and uses it as driving force. It also recovers heat energy from flue gas using a first evaporator 6 and a second evaporator 12 and uses it as heat for the secondary flow refrigerant in the vaporizer, thus achieving deep recovery and utilization of industrial waste heat. The first economizer 3 and the second economizer 8 exchange heat with the refrigerant flowing through them, reducing irreversible losses caused by heat exchange temperature differences in the first generator 1, the second generator 7, and the condenser 13. Compared with existing jet heat pump systems, it reduces the expansion ratio of a single jet, reduces internal losses in the jet, achieves cascaded energy utilization, and improves jet efficiency and the overall COP of the system. It should be noted that the first-stage heat pump circuit includes a primary main flow circuit consisting of the secondary side of the first generator 1, the first ejector 2, the primary side of the first economizer 3, the first gas-liquid separator 4, the first liquid storage tank 5, and the secondary side of the first economizer 3 connected in sequence, and a primary secondary flow circuit consisting of the primary side of the first ejector 2, the primary side of the first economizer 3, the first gas-liquid separator 4, the first liquid storage tank 5, and the secondary side of the first evaporator 6 connected in sequence; the second-stage heat pump circuit includes a secondary main flow circuit consisting of the secondary side of the second generator 7, the second ejector 8, the primary side of the second economizer 9, the second gas-liquid separator 10, the second liquid storage tank 11, and the secondary side of the second economizer 9 connected in sequence, and a secondary secondary flow circuit consisting of the primary side of the second ejector 8, the second economizer 9, the second gas-liquid separator 10, the second liquid storage tank 11, and the secondary side of the second evaporator 12 connected in sequence.The flow and heat transfer process of refrigerant in the first-stage heat pump circuit is as follows: The saturated liquid refrigerant flowing through the first generator 1 absorbs heat and becomes high-pressure refrigerant vapor. This high-pressure refrigerant vapor enters the first ejector 2 and mixes with low-pressure refrigerant vapor from the first evaporator 6. The refrigerant vapor exiting the first ejector 2 flows through the first economizer 3 and releases heat, becoming a two-phase refrigerant gas-liquid fluid. This two-phase fluid is then processed by the first gas-liquid separator 4 and separated into saturated liquid and saturated vapor. The saturated liquid refrigerant directly enters the first storage tank 5. After the refrigerant saturated vapor flows through the second generator 7 and releases heat, it becomes refrigerant saturated liquid and enters the first liquid storage tank 5. A portion of the refrigerant saturated liquid in the first liquid storage tank 5 is pumped and pressurized by the first working fluid pump 21 and enters the first economizer 3 to absorb heat and increase temperature. The pressurized and heated refrigerant saturated liquid enters the first generator 1 to absorb heat and vaporize, and becomes high-pressure refrigerant vapor. Another portion of the refrigerant saturated liquid in the first liquid storage tank 5 is throttled and depressurized by the first throttle valve 22 and enters the first evaporator 6 to absorb heat and vaporize, and becomes low-pressure refrigerant vapor. The flow and heat transfer process of refrigerant in the two-stage heat pump circuit is as follows: The saturated liquid refrigerant flowing through the second generator 7 absorbs heat and becomes high-pressure refrigerant vapor. The high-pressure refrigerant vapor enters the second ejector 8 and mixes with the low-pressure refrigerant vapor from the second evaporator 12. The refrigerant vapor at the outlet of the second ejector 8 flows through the second economizer 9 and releases heat, becoming a refrigerant gas-liquid two-phase fluid. The refrigerant gas-liquid two-phase fluid is processed by the second gas-liquid separator 10 and separated into saturated liquid refrigerant and saturated vapor refrigerant. The saturated liquid refrigerant directly enters the second storage tank 11. The refrigerant saturated vapor flows through condenser 13, releasing heat and becoming saturated refrigerant liquid, which then enters the second liquid storage tank 11. A portion of the saturated refrigerant liquid in the second liquid storage tank 11 is pumped and pressurized by the second working fluid pump 32 before entering the second economizer 8 for heat absorption and temperature increase. The pressurized and heated saturated refrigerant liquid then enters the second generator 7 for heat absorption and vaporization, becoming high-pressure refrigerant vapor. The remaining portion of the saturated refrigerant liquid in the second liquid storage tank 11 is throttled and depressurized by the second throttling valve 33 before entering the second evaporator 12 for heat absorption and vaporization, becoming low-pressure refrigerant vapor. It should also be noted that the wastewater mentioned in this document refers to high-temperature industrial wastewater containing a large amount of heat energy.

[0021] like Figure 2The second embodiment of the indirect double-effect jet heat pump system of this utility model is shown. Unlike the first embodiment, the second embodiment adds a subcooler 36. The primary side of the subcooler 36 is connected to a chilled water source to form a cooling circuit, and the secondary side of the subcooler 36 is connected in series in the seventh working fluid pipeline 20. A first throttling valve 22 is installed on the seventh working fluid pipeline 20 between the subcooler 36 and the first evaporator 6. This embodiment utilizes the subcooler 36 to cool the refrigerant in the seventh working fluid pipeline 20, effectively preventing vapor from entering the first throttling valve 22, thus improving stability and reliability. Figure 3 The third embodiment of the indirect double-effect jet heat pump system of this utility model, as shown, differs from the first embodiment in that it also adds a subcooler 36. The primary side of the subcooler 36 is connected in series in the eighteenth working fluid line 35, and the secondary side is connected in series in the sixteenth working fluid line 31. A second throttling valve 33 is installed on the sixteenth working fluid line 31 between the subcooler 36 and the second evaporator 12. This embodiment utilizes the subcooler 36 to exchange heat between the refrigerant at the outlet of the second evaporator 12 and the refrigerant entering the second throttling valve 33, thereby lowering the refrigerant temperature at the inlet of the throttling valve 33. This also prevents vapor from entering the second throttling valve 33, improving stability and reliability.

[0022] In practical applications, to facilitate parameter detection and control, this invention provides temperature sensors T1 and T2 at the two ports of the primary side of the first generator 1, temperature sensors T3 and T4 at the two ports of the secondary side of the condenser 13, temperature sensor T5 and pressure sensor P1 at the main flow inlet of the first ejector 2, pressure sensor P2 at the outlet of the first ejector 2, temperature sensor T6 and pressure sensor P3 at the main flow inlet of the second ejector 8, pressure sensor P4 at the outlet of the second ejector 8, temperature sensor T7 at the primary side inlet of the first evaporator 6, and temperature sensor T8 at the primary side outlet of the second evaporator 12. Temperature sensors T1, T2, T3, T4, T5, T6, T7, T8, and pressure sensors P1, P2, P3, and P4 are connected to a control device.

[0023] The above embodiments are merely descriptions of preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications made by those skilled in the art based on the technical solution of the present utility model without departing from the design concept of the present utility model shall fall within the scope of protection defined by the claims of the present utility model.

Claims

1. An indirect double-effect jet heat pump system, characterized in that, The system includes a first generator (1), a first ejector (2), a first economizer (3), a first gas-liquid separator (4), a first liquid storage tank (5), a first evaporator (6), a second generator (7), a second ejector (8), a second economizer (9), a second gas-liquid separator (10), a second liquid storage tank (11), a second evaporator (12), and a condenser (13). The primary side of the first generator (1) is connected to a wastewater heat source to form a heat extraction circuit. The secondary side outlet of the first generator (1) is connected to the main flow inlet of the first ejector (2) through a first working fluid pipeline (14). The outlet of the first ejector (2) is connected to the primary side inlet of the first economizer (3) through a second working fluid pipeline (15). The primary side outlet of the first economizer (3) is... The outlet is connected to the inlet of the first gas-liquid separator (4) via the third working fluid pipeline (16). The liquid phase outlet and gas phase outlet of the first gas-liquid separator (4) are connected to the first liquid storage tank (5) via the fourth working fluid pipeline (17) and the fifth working fluid pipeline (18), respectively. The first liquid storage tank (5) is connected to the secondary side inlet of the first economizer (3) and the secondary side inlet of the first evaporator (6) via the sixth working fluid pipeline (19) and the seventh working fluid pipeline (20), respectively. The sixth working fluid pipeline (19) and the seventh working fluid pipeline (20) are respectively equipped with a first working fluid pump (21) and a first throttle valve (22). The secondary side outlet of the first economizer (3) is connected to the secondary side inlet of the first generator (1) via the eighth working fluid pipeline (23). The first evaporator The secondary outlet of (6) is connected to the secondary inlet of the first injector (2) through the ninth working fluid pipeline (24). The primary inlet of the first evaporator (6) is connected to the flue gas heat source. The primary outlet of the first evaporator (6) is connected to the primary inlet of the second evaporator (12). The primary outlet of the second evaporator (12) is connected to an exhaust pipe. The primary side of the second generator (7) is connected in series in the fifth working fluid pipeline (18). The secondary outlet of the second generator (7) is connected to the main flow inlet of the second injector (8) through the tenth working fluid pipeline (25). The outlet of the second injector (8) is connected to the primary inlet of the second economizer (9) through the eleventh working fluid pipeline (26). The primary outlet of the second economizer (9) is connected to the twelfth working fluid pipeline. The working fluid pipeline (27) is connected to the inlet of the second gas-liquid separator (10). The liquid phase outlet and gas phase outlet of the second gas-liquid separator (10) are connected to the second storage tank (11) through the thirteenth working fluid pipeline (28) and the fourteenth working fluid pipeline (29), respectively. The second storage tank (11) is connected to the secondary side inlet of the second economizer (9) and the secondary side inlet of the second evaporator (12) through the fifteenth working fluid pipeline (30) and the sixteenth working fluid pipeline (31), respectively. The fifteenth working fluid pipeline (30) and the sixteenth working fluid pipeline (31) are equipped with a second working fluid pump (32) and a second throttle valve (33), respectively. The secondary side outlet of the second economizer (9) is connected to the secondary side inlet of the second generator (7) through the seventeenth working fluid pipeline (34).The secondary outlet of the second evaporator (12) is connected to the secondary inlet of the second ejector (8) via the eighteenth working fluid pipeline (35). The primary side of the condenser (13) is connected in series in the fourteenth working fluid pipeline (29). The secondary side of the condenser (13) is connected to the heating terminal to form a heating circuit. The system also includes control devices connected to the first ejector (2), the second ejector (8), the first working fluid pump (21), the first throttle valve (22), the second working fluid pump (32), and the second throttle valve (33), respectively.

2. The indirect double-effect jet heat pump system according to claim 1, characterized in that, It also includes a subcooler (36), the primary side of which is connected to a cold water source to form a cooling circuit, and the secondary side of which is connected in series in the seventh working fluid pipeline (20).

3. The indirect double-effect jet heat pump system according to claim 2, characterized in that, The first throttle valve (22) is installed on the seventh working fluid pipeline (20) between the subcooler (36) and the first evaporator (6).

4. The indirect double-effect jet heat pump system according to claim 1, characterized in that, It also includes a subcooler (36), the primary side of which is connected in series in the eighteenth working fluid pipeline (35), and the secondary side of which is connected in series in the sixteenth working fluid pipeline (31).

5. The indirect double-effect jet heat pump system according to claim 4, characterized in that, The second throttle valve (33) is installed on the sixteenth working fluid pipeline (31) between the subcooler (36) and the second evaporator (12).

6. The indirect double-effect jet heat pump system according to claim 1, characterized in that, Temperature sensor T1 and temperature sensor T2 are provided on the two ports of the primary side of the first generator (1), and temperature sensor T3 and temperature sensor T4 are provided on the two ports of the secondary side of the condenser (13).

7. The indirect double-effect jet heat pump system according to claim 1, characterized in that, The main inlet of the first injector (2) is equipped with a temperature sensor T5 and a pressure sensor P1, and the outlet of the first injector (2) is equipped with a pressure sensor P2.

8. The indirect double-effect jet heat pump system according to claim 1, characterized in that, The main inlet of the second injector (8) is equipped with a temperature sensor T6 and a pressure sensor P3, and the outlet of the second injector (8) is equipped with a pressure sensor P4.

9. The indirect double-effect jet heat pump system according to claim 1, characterized in that, The first evaporator (6) is equipped with a temperature sensor T7 at its primary side inlet, and the second evaporator (12) is equipped with a temperature sensor T8 at its primary side outlet.

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