A combined heat and power system integrated with a regenerative absorption heat pump and a method of operation thereof

Abstract

The application relates to the field of coal-fired power generation technology and discloses a combined heat and power system integrated with a regenerative absorption heat pump and an operation method thereof, which comprises a combined heat and power system, the combined heat and power system is composed of a steam turbine system, a regenerative absorption heat pump system and a heat network water heating system, the steam turbine system comprises a medium-pressure cylinder, the inlet of the medium-pressure cylinder is connected with steam from a high-pressure cylinder, and the outlet of the medium-pressure cylinder is connected with a first control valve and a second control valve; in a heat release heating mode of the application, a regenerative heat exchanger serves as a heat source of dilute solution at a solution pump outlet and heat network water, and concentrated solution in a generator serves as a heat source of the heat network water; the heat supply capacity of the heat pump system is greatly improved, steam extraction heat supply of the combined heat and power unit is correspondingly reduced, the upper limit of power generation of the system is improved, the lower limit is reduced, and the system is suitable for the condition that the combined heat and power system needs to be deeply peak-regulated.

Description

Technical Field

[0001] This invention relates to the field of coal-fired power generation technology, and in particular to a combined heat and power system with an integrated thermal storage absorption heat pump and its operation method. Background Technology

[0002] With the advancement of the dual-carbon transformation, my country's energy production structure is undergoing a significant shift. The proportion of renewable energy sources such as wind and solar power in production is continuously increasing, while the proportion of traditional coal-fired power units is gradually decreasing. This has brought a huge impact on the existing energy production side. On the one hand, renewable energy sources such as wind and solar power are highly unpredictable, placing new demands on the grid's regulation capabilities. On the other hand, in order to absorb renewable energy as much as possible, coal-fired power units, which are currently the main source of energy supply, need better peak-shaving capabilities.

[0003] In traditional coal-fired combined heat and power (CHP) systems, high-grade steam is initially used for power generation. After its grade decreases, some steam is extracted for heating, thus achieving cascaded energy utilization. Due to its high energy efficiency, CHP is widely recognized as a highly efficient coal-fired power generation technology and is widely used in northern my country. However, the characteristics of CHP units result in poor flexibility in electrical load regulation. Specifically, when a CHP unit is supplying heating load, its electrical load regulation range is narrower than under pure condensing conditions, meaning the lower limit for power generation load regulation is higher. This leads to CHP units occupying a significant portion of the electricity market during the heating season, hindering the absorption of renewable energy.

[0004] Existing integrated absorption heat pump solutions are one way to improve the peak-shaving performance of cogeneration units. Their main principle is to utilize absorption heat pumps to recover waste heat from air, exhaust steam, or flue gas, thereby reducing the heat output from extracted steam. This, in turn, improves the load regulation capability of the cogeneration unit to some extent. However, the improvement in unit regulation capability offered by simply integrating absorption heat pumps is limited. Further improving the load flexibility of coal-fired cogeneration units during the heating season remains an important direction for their technological development.

[0005] Therefore, the above problems are solved by an integrated thermal storage absorption heat pump cogeneration system and its operation method. Summary of the Invention

[0006] The purpose of this invention is to provide a combined heat and power system with an integrated thermal storage absorption heat pump and its operation method, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a combined heat and power system, wherein the combined heat and power system comprises a steam turbine system, a thermal storage absorption heat pump system, and a heating network water heating system.

[0008] Preferably, the turbine system includes an intermediate-pressure cylinder, the inlet of which is connected to steam from a high-pressure cylinder, the outlet of which is connected to a first control valve and a second control valve, the outlet of which is connected to a low-pressure cylinder, the steam outlet of which is connected to a condenser, and the other end of which is connected to a generator. The intermediate-pressure cylinder, the low-pressure cylinder, and the generator are coaxially connected.

[0009] Preferably, the outlet of the first control valve is connected to a first diverter valve.

[0010] Preferably, the heat storage absorption heat pump system includes an evaporator, the refrigerant outlet of the evaporator is connected to an absorber, the dilute solution outlet of the absorber is connected to a solution pump, a second diversion valve, a heat storage heat exchanger, and a generator in sequence, the concentrated solution outlet of the generator is connected to a third diversion valve, the outlet of the third diversion valve is connected to both the heat exchanger and the concentrated solution inlet of the heat storage heat exchanger, the concentrated solution outlet of the heat storage heat exchanger is connected to a first throttling valve, and the refrigerant outlet of the generator is connected to a condenser, a second throttling valve, and an evaporator in sequence.

[0011] Preferably, the heating network water heating system includes an absorber and a peak heater. The inlet of the absorber is connected to the return water of the heating network. The outlet of the absorber's heating network water is connected to a fourth diversion valve. The outlet of the fourth diversion valve is connected to the heating network water inlets of the regenerative heat exchanger and the condenser, respectively. The outlet of the regenerative heat exchanger's heating network water is connected to a fifth diversion valve. The outlet of the fifth diversion valve is connected to the heating network water inlets of the heat exchanger and the condenser, respectively. The outlet of the heat exchanger's heating network water is connected to the condenser's inlet. The outlet of the condenser's heating network water is connected to the heating network water of the peak heater. The outlet of the peak heater's heating network water is connected to the heating network as the heating network water supply.

[0012] Preferably, the heat source for the regenerative heat exchanger is the concentrated solution at the outlet of the third diversion valve, and the heat release target of the regenerative heat exchanger is the dilute solution at the outlet of the second diversion valve or the hot water at the outlet of the fourth diversion valve.

[0013] Preferably, the evaporator is a low-temperature heat source, which includes air, water, and soil.

[0014] Preferred options include heat storage heating mode and heat release heating mode.

[0015] Preferably, the heat storage heating mode includes: the dilute solution at the absorber outlet is pressurized by a solution pump and then directly enters the generator through a second diversion valve; the concentrated solution outlet of the generator enters the regenerative heat exchanger to release heat after passing through a third diversion valve, completing the heat storage process of the regenerative heat exchanger; after the concentrated solution releases heat, it enters the absorber after being throttled by a first throttle valve; the heat network return water outlet of the absorber enters the condenser heat network water inlet after passing through a fourth diversion valve. Since the dilute solution at the outlet of the second diversion valve is not heated by the regenerative heat exchanger, under the condition that the refrigerant outlet temperature and flow rate of the generator are constant, the steam flow rate required by the generator from the first diversion valve increases.

[0016] Preferably, the heat release and heating mode includes: the dilute solution at the absorber outlet is pressurized by a solution pump, enters a regenerative heat exchanger through a second diversion valve to absorb heat, and then enters the generator; the concentrated solution outlet of the generator enters the heat exchanger through a third diversion valve to release heat and is then connected to the inlet of the first throttle valve; the heat network return water outlet of the absorber is heated by the regenerative heat exchanger after passing through a diversion valve, and then enters the heat network water inlet of the condenser; the dilute solution at the outlet of the second diversion valve and the heat network water at the outlet of the fourth diversion valve are heated by the regenerative heat exchanger to complete the heat release process of the regenerative heat exchanger; the heat network return water is sequentially heated by the absorber, the regenerative heat exchanger, the heat exchanger, the condenser, and the peak heater before entering the heat network as supply water.

[0017] Preferably, the heat release heating mode further includes: the dilute solution at the absorber outlet is pressurized by a solution pump, enters a regenerative heat exchanger through a second diversion valve to absorb heat, and then enters the generator; the concentrated solution outlet of the generator enters a regenerative heat exchanger through a third diversion valve to release heat, and then connects to the inlet of the first throttle valve; the heat network return water outlet of the absorber is heated by a regenerative heat exchanger after passing through a fourth diversion valve, and then enters the heat network water inlet of the condenser through a fifth diversion valve; the heat network return water is heated sequentially by the absorber, the regenerative heat exchanger, the condenser, and the peak heater before entering the heat network as supply water.

[0018] Preferably, the heat storage and heating mode includes: in addition to the concentrated solution at the outlet of the third diversion valve, the heat source of the heat storage heat exchanger can also be heated by an external heat source, including electric heating, steam from the steam turbine unit, and other high-temperature media.

[0019] The technical effects and advantages of this invention are as follows: 1. In the exothermic heating mode of this application, the heat storage heat exchanger serves as the heat source for the dilute solution at the outlet of the solution pump and the heating network water, while the concentrated solution in the generator serves as the heat source for the heating network water. At this time, the heating capacity of the heat pump system is greatly improved, and the steam extraction heating of the cogeneration unit is reduced accordingly. At this time, the upper limit of the power generation of the system is increased and the lower limit is reduced, which is suitable for the situation where the cogeneration system needs deep peak shaving.

[0020] 2. In the exothermic heating mode of this application, the regenerative heat exchanger serves as the heat source for the dilute solution at the outlet of the solution pump and the heating network water, while the concentrated solution from the generator serves as the heat source for the regenerative heat exchanger. This increases the heating capacity of the heat pump system, but only slightly compared to the exothermic heating mode. Consequently, the extraction steam heating from the cogeneration unit decreases. This results in a higher upper limit and a lower lower limit for the system's power generation, making it suitable for situations requiring deep peak shaving in cogeneration systems. Furthermore, this regenerative absorption heat pump system has a high degree of integration and can be directly integrated into production and applied to traditional cogeneration units, enabling them to achieve higher heating capacity and better flexibility. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the combined heat and power system of the integrated thermal storage absorption heat pump of the present invention.

[0022] Figure 2 This is a schematic diagram of the thermal storage and heating system structure of the present invention.

[0023] Figure 3 This is a schematic diagram of the system structure of the exothermic heating mode of the present invention.

[0024] Figure 4 This is a schematic diagram of the system structure of the second heat release heating mode of the present invention.

[0025] Figure 5 This is a schematic diagram of the heat generation and power supply of the present invention.

[0026] In the diagram: 1. Evaporator; 2. Absorber; 3. First throttle valve; 4. Solution pump; 5. Second diverter valve; 6. Regenerative heat exchanger; 7. Generator; 8. Condenser; 9. Fourth diverter valve; 10. Second throttle valve; 11. Third diverter valve; 12. Heat exchanger; 13. Peak heater; 14. First diverter valve; 15. First control valve; 16. Second control valve; 17. Intermediate-pressure cylinder; 18. Low-pressure cylinder; 19. Generator; 20. Fifth diverter valve. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] This invention provides, for example Figures 1 to 5 The invention relates to a combined heat and power (CHP) system with an integrated thermal storage absorption heat pump and its operation method. The CHP system consists of a steam turbine system, a thermal storage absorption heat pump system, and a heating network water heating system.

[0029] The steam turbine system includes an intermediate-pressure cylinder 17. The inlet of the intermediate-pressure cylinder 17 is connected to steam from the high-pressure cylinder. The outlet of the intermediate-pressure cylinder 17 is connected to a first control valve 15 and a second control valve 16. The outlet of the second control valve 16 is connected to a low-pressure cylinder 18. The steam outlet of the low-pressure cylinder 18 is connected to a condenser. The other end of the low-pressure cylinder 18 is connected to a generator 19. The intermediate-pressure cylinder 17, the low-pressure cylinder 18, and the generator 19 are coaxially connected.

[0030] The outlet of the first control valve 15 is connected to the first diverter valve 14.

[0031] In use, the first control valve 15 supplies power to the first diversion valve 14.

[0032] The thermal storage absorption heat pump system includes an evaporator 1, an absorber 2 connected to the refrigerant outlet of the evaporator 1, a solution pump 4, a second diverter valve 5, a thermal storage heat exchanger 6, and a generator 7 connected in sequence to the dilute solution outlet of the absorber 2, a concentrated solution outlet of the generator 7 connected to a third diverter valve 11, an outlet of the third diverter valve 11 connected to a heat exchanger 12 and a concentrated solution inlet of the thermal storage heat exchanger 6, a first throttling valve 3 connected to the concentrated solution outlet of the thermal storage heat exchanger 6, and a condenser 8, a second throttling valve 10, and an evaporator 1 connected in sequence to the refrigerant outlet of the generator 7.

[0033] The heating network water heating system includes an absorber 2 and a peak heater 13. The inlet of the absorber 2 is connected to the return water of the heating network. The outlet of the absorber 2 is connected to a fourth diversion valve 9. The outlet of the fourth diversion valve 9 is connected to the inlet of the heating network water of the heat storage heat exchanger 6 and the condenser 8, respectively. The outlet of the heat storage heat exchanger 6 is connected to a fifth diversion valve 20. The outlet of the fifth diversion valve 20 is connected to the inlet of the heating network water of the heat exchanger 12 and the condenser 8, respectively. The outlet of the heat exchanger 12 is connected to the inlet of the condenser 8. The outlet of the condenser 8 is connected to the heating network water of the peak heater 13. The outlet of the peak heater 13 is connected to the heating network as the heating network water supply.

[0034] The heat source for the regenerative heat exchanger 6 is the concentrated solution at the outlet of the third diversion valve 11, and the heat release object of the regenerative heat exchanger 6 is the dilute solution at the outlet of the second diversion valve 5 or the hot water at the outlet of the fourth diversion valve 9.

[0035] Evaporator 1 is a low-temperature heat source, which includes air, water and soil.

[0036] Reference Appendix Figure 2The heat storage and heating mode includes: the dilute solution at the outlet of absorber 2 is pressurized by solution pump 4 and then directly enters generator 7 through second diversion valve 5. The concentrated solution outlet of generator 7 enters heat storage heat exchanger 6 through third diversion valve 11 to release heat, completing the heat storage process of heat storage heat exchanger 6. After the concentrated solution releases heat, it enters absorber 2 through first throttling valve 3. The heat network return water outlet of absorber 2 enters heat network water inlet of condenser 8 through fourth diversion valve 9. Since the dilute solution at the outlet of second diversion valve 5 is not heated by heat storage heat exchanger 6, under the condition that the refrigerant outlet temperature and flow rate of generator 7 are constant, the steam flow rate required by generator 7 from first diversion valve 14 increases.

[0037] At this time, since the dilute solution at the outlet of the second diversion valve 5 is not heated by the regenerative heat exchanger 6, under the condition that the refrigerant outlet temperature and flow rate of the generator 7 are constant, the steam flow rate required by the generator 7 from the first diversion valve 14 increases, thereby achieving the effect of increasing the lower limit of the power generation load of the cogeneration unit and reducing its upper limit of the power generation load.

[0038] Reference Appendix Figure 3 The heat release heating mode includes: the dilute solution at the outlet of absorber 2 is pressurized by solution pump 4, enters the regenerative heat exchanger 6 through the second diversion valve 5 to absorb heat, and then enters the generator 7. The concentrated solution outlet of generator 7 enters the heat exchanger 12 through the third diversion valve 11 to release heat and then connects to the inlet of the first throttle valve 3. The heat network return water outlet of absorber 2 is heated by the regenerative heat exchanger 6 through the fourth diversion valve 9, and then heated by the heat exchanger 12 through the fifth diversion valve 20 before entering the heat network water inlet of condenser 8. The dilute solution at the outlet of the second diversion valve 5 and the heat network water at the outlet of the fourth diversion valve 9 are heated by the regenerative heat exchanger 6 to complete the heat release process of the regenerative heat exchanger 6. The heat network return water is heated sequentially by absorber 2, regenerative heat exchanger 6, heat exchanger 12, condenser 8 and peak heater 13 before entering the heat network as supply water.

[0039] At this time, the dilute solution at the outlet of the second diversion valve 5 is heated by the regenerative heat exchanger 6, and the concentrated solution after the third diversion valve 11 also serves as the heat source for the return water of the heating network. This can achieve the effect of increasing the heating load and raising the upper limit of the power generation load of the cogeneration unit while lowering its lower limit without increasing the amount of steam extracted from the inlet of the first diversion valve 14.

[0040] Reference Appendix Figure 4The heat release heating mode also includes: the dilute solution at the outlet of absorber 2 is pressurized by solution pump 4, enters the regenerative heat exchanger 6 through the second diversion valve 5 to absorb heat, and then enters the generator 7. The concentrated solution outlet of generator 7 enters the regenerative heat exchanger 6 through the third diversion valve 11 to release heat and then connects to the inlet of the first throttle valve 3. The heat network return water outlet of absorber 2 is heated by the regenerative heat exchanger 6 through the fourth diversion valve 9, and then enters the heat network water inlet of condenser 8 through the fifth diversion valve 20. The heat network return water is heated sequentially by absorber 2, regenerative heat exchanger 6, condenser 8 and peak heater 13 before entering the heat network as supply water.

[0041] At this time, in the regenerative heat exchanger 6, the dilute solution at the outlet of the second diversion valve 5 and the hot water at the outlet of the fourth diversion valve 9 serve as cold sources, while the concentrated solution after the regenerative heat exchanger 6 and the third diversion valve 11 serve as heat sources. This can achieve the effect of increasing the heating load and raising the upper limit of the power generation load of the cogeneration unit while lowering its lower limit without increasing the steam extraction rate at the inlet of the first diversion valve 14.

[0042] In addition to the concentrated solution at the outlet of the third diversion valve 11, the heat source for the regenerative heat exchanger 6 can also be heated by external heat sources, including electric heating, steam from the turbine unit, and other high-temperature media. The regenerative heat exchanger 6 can utilize the electricity generated by the unit for heating, thereby reducing the power generation load of the unit.

[0043] Conclusion: By integrating a thermal storage absorption heat pump system into a traditional cogeneration system, better operational flexibility is achieved compared to traditional integrated absorption heat pump systems while ensuring efficient system operation. In the thermal storage heating mode of this application, the concentrated solution of generator 7 is used for thermal storage in thermal storage heat exchanger 6. The heat required for the dilute solution entering generator 7 is used to supplement the extraction steam of the unit. The overall effect is to extract more steam and complete the thermal storage of the system. At this time, the upper limit of power generation of the system is reduced and the lower limit is increased, which is suitable for the situation where the electrical load of the cogeneration system is high but has not reached the upper limit. In the exothermic heating mode 1 of this application, thermal storage heat exchanger 6 serves as the heat source for the dilute solution at the outlet of solution pump 4 and the heating network water, and the concentrated solution of generator 7 serves as the heat source for the heating network water. At this time, the heating capacity of the heat pump system is greatly improved, and the extraction steam heating of the cogeneration unit is reduced accordingly. At this time, the upper limit of power generation of the system is increased and the lower limit is reduced, which is suitable for the situation where the cogeneration system needs deep peak shaving.

[0044] In the exothermic heating mode 2 of this application, the regenerative heat exchanger 6 serves as the heat source for the dilute solution at the outlet of the solution pump 4 and the heating network water, while the concentrated solution in the generator 7 serves as the heat source for the regenerative heat exchanger 6. In this mode, the heating capacity of the heat pump system is also increased, but only slightly compared to the exothermic heating mode 1. The extraction steam heating from the cogeneration unit is correspondingly reduced. This results in an increased upper limit and a decreased lower limit for the system's power generation, making it suitable for situations requiring deep peak shaving in cogeneration systems. Furthermore, this regenerative absorption heat pump system has a high degree of integration and can be directly integrated into production and applied to traditional cogeneration units, enabling them to achieve higher heating capacity and better flexibility.

[0045] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined heat and power system integrating a thermal storage absorption heat pump, characterized in that: This includes a combined heat and power (CHP) system, which consists of a steam turbine system, a thermal storage absorption heat pump system, and a heating network water heating system. The turbine system includes an intermediate-pressure cylinder (17), the inlet of which is connected to steam from the high-pressure cylinder, the outlet of which is connected to a first control valve (15) and a second control valve (16), the outlet of which is connected to a low-pressure cylinder (18), the steam outlet of which is connected to a condenser, and the other end of which is connected to a generator (19). The intermediate-pressure cylinder (17), the low-pressure cylinder (18) and the generator (19) are coaxially connected. The outlet of the first control valve (15) is connected to a first diverter valve (14). The heat storage absorption heat pump system includes an evaporator (1), the refrigerant outlet of the evaporator (1) is connected to an absorber (2), the dilute solution outlet of the absorber (2) is connected to a solution pump (4), a second diversion valve (5), a heat storage heat exchanger (6) and a generator (7) in sequence, the concentrated solution outlet of the generator (7) is connected to a third diversion valve (11), the outlet of the third diversion valve (11) is connected to the concentrated solution inlet of the heat exchanger (12) and the heat storage heat exchanger (6) respectively, the concentrated solution outlet of the heat storage heat exchanger (6) is connected to a first throttle valve (3), and the refrigerant outlet of the generator (7) is connected to a condenser (8), a second throttle valve (10) and an evaporator (1) in sequence.

2. The combined heat and power system of an integrated thermal storage absorption heat pump according to claim 1, characterized in that: The heating network water heating system includes an absorber (2) and a peak heater (13). The inlet of the absorber (2) is connected to the return water of the heating network. The outlet of the absorber (2) is connected to a fourth diversion valve (9). The outlet of the fourth diversion valve (9) is connected to the inlet of the heating network water of the heat storage heat exchanger (6) and the condenser (8), respectively. The outlet of the heat storage heat exchanger (6) is connected to a fifth diversion valve (20). The outlet of the fifth diversion valve (20) is connected to the inlet of the heating network water of the heat exchanger (12) and the inlet of the condenser (8), respectively. The outlet of the heat exchanger (12) is connected to the inlet of the condenser (8). The outlet of the condenser (8) is connected to the heating network water of the peak heater (13). The outlet of the peak heater (13) is connected to the heating network as the heating network water supply.

3. A combined heat and power system with an integrated thermal storage absorption heat pump according to claim 2, characterized in that: The heat source for the regenerative heat exchanger (6) is the concentrated solution at the outlet of the third diversion valve (11), and the heat release object of the regenerative heat exchanger (6) is the dilute solution at the outlet of the second diversion valve (5) or the hot water at the outlet of the fourth diversion valve (9).

4. A combined heat and power system with an integrated thermal storage absorption heat pump according to claim 1, characterized in that: The evaporator (1) is a low-temperature heat source, which includes air, water and soil.

5. A method for operating a combined heat and power system with an integrated thermal storage absorption heat pump, the method utilizing a combined heat and power system with an integrated thermal storage absorption heat pump as described in any one of claims 1-4, characterized in that: This includes heat storage heating mode and heat release heating mode; The heat storage and heating mode includes: the dilute solution at the outlet of the absorber (2) is pressurized by the solution pump (4) and then directly enters the generator (7) through the second diversion valve (5). The concentrated solution outlet of the generator (7) enters the heat storage heat exchanger (6) to release heat after passing through the third diversion valve (11), thus completing the heat storage process of the heat storage heat exchanger (6). After the concentrated solution releases heat, it enters the absorber (2) after being throttled by the first throttle valve (3). The heat network return water outlet of the absorber (2) enters the heat network water inlet of the condenser (8) after passing through the fourth diversion valve (9). Since the dilute solution at the outlet of the second diversion valve (5) is not heated by the heat storage heat exchanger (6), under the condition that the refrigerant outlet temperature and flow rate of the generator (7) are constant, the steam flow rate required by the generator (7) from the first diversion valve (14) increases. The heat release and heating mode includes: the dilute solution at the outlet of the absorber (2) is pressurized by the solution pump (4), enters the regenerative heat exchanger (6) through the second diversion valve (5), absorbs heat, and then enters the generator (7). The concentrated solution outlet of the generator (7) enters the heat exchanger (12) through the third diversion valve (11), releases heat, and then connects to the inlet of the first throttle valve (3); the heat network return water outlet of the absorber (2) is heated by the regenerative heat exchanger (6) through the fourth diversion valve (9), and then passes through the first throttle valve (3). After being heated by the heat exchanger (12), the five-way valve (20) enters the condenser (8) and the hot water inlet. The dilute solution at the outlet of the second-way valve (5) and the hot water at the outlet of the fourth-way valve (9) are heated by the regenerative heat exchanger (6) to complete the heat release process of the regenerative heat exchanger (6). The hot water return is heated by the absorber (2), the regenerative heat exchanger (6), the heat exchanger (12), the condenser (8) and the peak heater (13) in sequence before entering the hot water network as supply water.

6. The operation method of a combined heat and power system with an integrated thermal storage absorption heat pump according to claim 5, characterized in that: The heat release and heating mode further includes: the dilute solution at the outlet of the absorber (2) is pressurized by the solution pump (4), enters the regenerative heat exchanger (6) through the second diversion valve (5) to absorb heat, and then enters the generator (7). The concentrated solution outlet of the generator (7) enters the regenerative heat exchanger (6) through the third diversion valve (11) to release heat and then connects to the inlet of the first throttle valve (3). The heat network return water outlet of the absorber (2) is heated by the regenerative heat exchanger (6) through the fourth diversion valve (9), and enters the heat network water inlet of the condenser (8) through the fifth diversion valve (20). The heat network return water is heated by the absorber (2), the regenerative heat exchanger (6), the condenser (8) and the peak heater (13) in sequence and then enters the heat network as water supply.

7. The operation method of a combined heat and power system with an integrated thermal storage absorption heat pump according to claim 6, characterized in that: The heat storage and heating mode includes: the heat storage heat source of the heat storage heat exchanger (6) can be heated by external heat sources, in addition to the concentrated solution at the outlet of the third diversion valve (11), including electric heating, steam from the steam turbine unit and other high-temperature media.

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