A combined heat and power device and method based on thermal power and solar thermal energy

Abstract

The present invention discloses a combined heat and power device and method based on thermal power and solar energy, the device includes a thermal power unit and an absorption heat pump loop system; by successively exchanging heat with the solution heat circulation unit, the solar water heater and the extraction steam heater in the absorption heat pump loop system, the return water of the heat network is converted into high-quality water for the heat network, thereby achieving the improvement of the quality of medium and low temperature solar energy while utilizing the thermal power unit for power generation and waste heat recovery. Thus, the comprehensive application of thermal power and solar energy for power generation and heating is realized. The combined heat and power method utilizing the combined heat and power device can adjust the matching between thermal power and solar energy according to actual needs, realize the flexible utilization of solar energy, give play to the basic support role of the thermal power unit, further reduce the technical difficulty of the comprehensive utilization of thermal power and solar energy, and improve the economic benefits of the entire unit.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic cogeneration, and relates to a heat and power cogeneration device and method based on thermal power and solar energy. Background Technology

[0002] Solar energy is a clean and renewable energy source. In the context of energy crisis and environmental pollution, it has been greatly favored by various industries. Using clean and easy-to-deploy solar energy to complement other energy sources has also become a new development direction with great potential development value.

[0003] Since the complementary heating of solar thermal and thermal power units is technically feasible, the comprehensive utilization of waste heat from thermal power units and solar thermal energy can effectively reduce heating costs. At present, the utilization of waste heat from thermal power itself has been widely studied and applied, including cold end waste heat recovery and exhaust waste heat utilization. The combination of solar energy and thermal power generally adopts solar-coal complementary power generation, that is, the heat of solar energy is used to increase the feed water temperature in the feed water pump and reduce the heat output of the boiler, thereby realizing the joint application of thermal power and solar energy. However, when solar energy is used for solar-coal complementary power generation, the heat of solar energy itself is used to increase the temperature of the feed water in the feed water pump, so that the utilization efficiency of solar energy is limited by the original feed water temperature of the feed water pump and the upper limit of the heating temperature provided by the solar energy itself, and the energy utilization quality is low.

[0004] Therefore, further improving the utilization quality of solar energy and expanding its utilization scenarios are the primary issues that need to be urgently addressed in the field of solar-coal complementary power generation technology. SUMMARY OF THE INVENTION

[0005] The purpose of the present invention is to solve the problems in the prior art and provide a combined heat and power device based on thermal power and solar energy. While utilizing thermal power units to generate electricity and recycle waste heat, it can improve the quality of medium and low temperature solar energy and realize the comprehensive application of thermal power and solar energy for power generation and heating.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The present invention provides a combined heat and power device based on thermal power and solar energy, including a thermal power unit and an absorption heat pump circuit system;

[0008] The absorption heat pump circuit system includes a solar water heater, a solution heat circulation unit and an extraction steam heater;

[0009] The hot water generated by the solar water heater enters the solution heat circulation unit for heat exchange and then returns to the solar water heater;

[0010] The return water from the heating network is heated by the solution heat circulation unit and then enters the extraction heater for heating and then output as the heating network water supply;

[0011] The high-temperature extraction steam generated by the thermal power unit enters the absorption heat pump loop system in two paths: one path of high-temperature extraction steam enters the solution heat cycle unit for heat exchange and then returns to the thermal power unit as the unit make-up water; the other path of high-temperature extraction steam enters the extraction steam heater to exchange heat with the return water of the heat supply network, and after heat exchange, it is mixed with the return water of the heat supply network and output as the heat supply network water supply.

[0012] Preferably, the solution heat cycle unit includes an absorber, a solution pump, a solution heat exchanger, a generator, a condenser and an evaporator;

[0013] The return water of the heat supply network enters the extraction steam heater after heat exchange through the absorber and the condenser in sequence, and is output as the heat supply network water supply;

[0014] The hot water generated by the solar water heater enters the evaporator for heat exchange and then returns to the solar water heater;

[0015] After the absorption solution in the generator absorbs the heat of the high-temperature extraction steam generated by the thermal power unit, the water in the absorption solution evaporates into water vapor. The water vapor enters the condenser to exchange heat with the return water of the heat supply network, enters the evaporator to exchange heat with the hot water from the solar water heater, and the heat-exchanged water vapor enters the absorber and is absorbed by the concentrated solution in the absorber, releasing heat to the return water of the heat supply network in the absorber; the absorption solution in the generator loses water and enters the solution heat exchanger as the concentrated solution for heat exchange. The heat-exchanged concentrated solution enters the absorber, absorbs the water vapor in the absorber, and enters the solution heat exchanger as the dilute solution through the solution pump to exchange heat with the concentrated solution from the generator. The heat-exchanged dilute solution returns to the generator to complete the solution heat cycle.

[0016] Preferably, a steam extraction valve is arranged between the thermal power unit and the absorption heat pump loop system.

[0017] Preferably, a generator regulating valve is arranged between the steam extraction valve and the solution heat cycle unit.

[0018] Preferably, a heater regulating valve is arranged between the steam extraction valve and the extraction steam heater.

[0019] Preferably, a throttle valve is arranged between the condenser and the evaporator.

[0020] Preferably, a solution expansion valve is arranged between the concentrated solution output end of the solution heat exchanger and the concentrated solution input end of the absorber.

[0021] A combined heat and power supply method based on thermal power and solar energy using the above combined heat and power supply device is completed through the following steps:

[0022] Open the high and low pressure connecting pipe regulating valve and the steam extraction valve;

[0023] Transport the high-temperature extraction steam generated by the thermal power unit into the absorption heat pump loop system through the steam extraction valve;

[0024] After the return water of the heat network is transported into the absorber to absorb heat, it is successively transported into the condenser and the extraction steam heater, and after being heated in the extraction steam heater, it flows out as the supply water of the heat network;

[0025] The hot water generated by the solar water heater is transported into the evaporator for heat exchange, and then transported back to the solar water heater;

[0026] Open the generator regulating valve and the heater regulating valve;

[0027] The high-temperature extraction steam entering the absorption heat pump loop system is divided into two paths: one path of the high-temperature extraction steam enters the generator through the generator regulating valve, and after exchanging heat with the absorption solution in the generator, it is output as the make-up water of the unit; the other part of the high-temperature extraction steam is transported into the extraction steam heater, and after mixing and releasing heat with the return water of the heat network in the extraction steam heater, it is output as the supply water of the heat network;

[0028] Open the throttle valve and the solution expansion valve;

[0029] The absorption solution in the generator is heated by the high-temperature extraction steam, so that the water in the absorption solution evaporates into water vapor and enters the condenser to exchange heat with the return water of the heat network from the absorber. The water vapor after heat exchange is converted into liquid water and input into the evaporator through the throttle valve. The liquid water entering the evaporator exchanges heat with the hot water from the solar water heater, and is again converted into water vapor and enters the absorber, where it is absorbed by the concentrated solution in the absorber and releases heat to the return water of the heat network;

[0030] After the absorption solution in the generator loses water after heat exchange, it is transported into the solution heat exchanger for heat exchange, and then the concentrated solution after heat exchange is transported into the absorber through the solution expansion valve, so that it absorbs the water vapor from the evaporator and becomes a dilute solution. Finally, the dilute solution is transported into the solution pump to be boosted in pressure, and then transported into the solution heat exchanger to exchange heat with the concentrated solution from the generator, and the dilute solution after heat exchange is transported back to the generator to complete the solution heat cycle.

[0031] Preferably, when the hot water provided by the solar water heater has a relatively high temperature, adjust the generator regulating valve and the extraction steam valve to increase the opening degrees of the generator regulating valve and the extraction steam valve, and adjust the heater regulating valve to reduce the opening degree of the heater regulating valve, so as to increase the amount of high-temperature extraction steam entering the generator, accelerate the solution heat cycle, increase the heat absorption capacity of the solar water heater, and at the same time, reduce the amount of high-temperature extraction steam entering the extraction steam heater, so that the supply water of the heat network flowing out of the extraction steam heater is maintained within a specific value.

[0032] Preferably, when the hot water temperature provided by the solar water heater is insufficient, adjust the opening degrees of the steam extraction valve and the heater regulating valve to increase their opening degrees, adjust the generator regulating valve to reduce its opening degree, reduce the amount of high-temperature steam extraction entering the evaporator, slow down the solution heat cycle, and thereby reduce the heat absorption capacity of the solar water heater. Increase the amount of high-temperature steam extraction entering the steam extraction heater, so that the heat supply water flowing out of the steam extraction heater is maintained within a specific value.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention provides a combined heat and power supply device based on thermal power and solar energy. By effectively combining a thermal power unit with an absorption heat pump loop system, the high-temperature waste heat of the steam extraction of the thermal power unit is successfully introduced into the absorption heat pump loop system, improving the low-temperature heat of solar energy in the absorption heat pump loop system, and thereby realizing the improvement of the utilization grade of solar energy. Secondly, in the combined heat and power supply device, the flexible allocation between solar energy and thermal power is realized through the setting of a small number of control valves, improving the flexibility of energy utilization. The device is simple and has a low transformation cost, which is an innovative technology for clean energy utilization.

[0035] A combined heat and power supply method based on thermal power and solar energy disclosed by the present invention realizes the comprehensive utilization of solar energy and thermal power for heating by making the return water of the heat supply network absorb the heat released during the absorption process of the absorption solution, the heat of the condenser from solar energy, and the waste heat of steam extraction in sequence, and finally becoming high-quality heat supply water for use. At the same time, it also realizes the comprehensive utilization and joint dispatching of the high-grade waste heat of the thermal power unit and the low-grade solar energy for heating, improving the flexibility of energy utilization, making the utilization of high-temperature heat and low-temperature heat more comprehensive and efficient, and improving the basic support role and economy of the thermal power unit under the background of the new energy pattern. The method principle is simple, clear, and highly operable. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0037] Figure 1 It is a diagram of the combined heat and power supply device based on thermal power and solar energy of the present invention.

[0038] Wherein: 1 - condenser, 2 - feed water pump, 3 - boiler, 4 - high-pressure steam turbine, 5 - low-pressure steam turbine, 6 - regulating valve for high-low pressure connecting pipe, 7 - extraction valve, 8 - solar water heater, 9 - absorber, 10 - solution pump, 11 - solution expansion valve, 12 - solution heat exchanger, 13 - regulating valve for generator, 14 - regulating valve for heater, 15 - generator, 16 - condenser, 17 - extraction heater, 18 - throttle valve, 19 - evaporator. Detailed implementation manners

[0039] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the accompanying drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0041] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0042] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships in which the inventive product is customarily placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0043] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0044] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if the terms "set", "install", "connected", "connected" are used, they 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. 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 situations.

[0045] The following further describes the present invention in detail with reference to the drawings:

[0046] See Figure 1 , the present invention provides a combined heat and power supply device based on thermal power and solar energy, including an extraction steam valve 7, a solution expansion valve 11, a generator regulating valve 13, a heater regulating valve 14, a throttle valve 18, a thermal power unit and an absorption heat pump loop system; the thermal power unit includes a condenser 1, a feed water pump 2, a boiler 3, a high-pressure steam turbine 4 and a low-pressure steam turbine 5. The absorption heat pump loop system includes a solar water heater 8, a solution heat circulation unit and an extraction steam heater 17. The solution heat circulation unit includes an absorber 9, a solution pump 10, a solution heat exchanger 12, a generator 15, a condenser 16 and an evaporator 19.

[0047] The circulating steam enters the condenser 1 in the thermal power unit and is cooled into cooling water and enters the feed water pump 2. The cooling water is transported by the feed water pump 2 into the boiler 3 to absorb heat and become high-temperature and high-pressure steam, and the high-temperature and high-pressure steam enters the high-pressure steam turbine 4 to do work;

[0048] The return water of the heat network enters the absorber 9 in the solution heat circulation, exchanges heat and then enters the condenser 16 and the extraction steam heater 17 in sequence, and flows out as the heat network supply water after being heated in the extraction steam heater 17;

[0049] The hot water generated by the solar water heater 8 returns to the solar water heater after heat exchange through the evaporator 19;

[0050] The high-temperature extraction steam generated by the steam turbine 4 is divided into two paths: one path of high-temperature extraction steam enters the low-pressure steam turbine 5 through the high-low pressure connecting pipe regulating valve 6 to do work and then returns to the condenser 1; the other path of high-temperature extraction steam enters the absorption heat pump loop system through the extraction steam valve 7;

[0051] The high-temperature extraction steam entering the absorption heat pump loop system is divided into two parts: one part of the high-temperature extraction steam enters the generator 15 in the solution heat circulation unit through the generator regulating valve 13, exchanges heat with the absorption solution in the generator 15 and is cooled into liquid water as the unit makeup water and returns to the thermal power unit; the other part of the high-temperature extraction steam enters the extraction steam heater 17 through the heater regulating valve 14 and is mixed with the return water of the heat network in the extraction steam heater 17 as the heat network supply water output;

[0052] After the absorption solution in the generator 15 is heated by high-temperature extraction steam, the water in the absorption solution evaporates into water vapor and enters the condenser 16. In the condenser 16, it exchanges heat with the return water of the heat network from the absorber 9 and becomes liquid water, which enters the evaporator 19 through the throttle valve 18. The liquid water entering the evaporator 19 exchanges heat with the hot water from the solar water heater 8 and becomes water vapor, which enters the absorber 9 and is absorbed by the concentrated solution in the absorber 9, releasing heat to the return water of the heat network in the absorber 9;

[0053] After the absorption solution in the generator 15 loses water, it becomes a concentrated solution and enters the solution heat exchanger 12 through the solution expansion valve 11 for heat exchange. The concentrated solution after heat exchange enters the absorber 9 to absorb the water vapor from the evaporator 19 and becomes a dilute solution. The dilute solution is pressurized by the solution pump 10 and enters the solution heat exchanger 12 to exchange heat with the concentrated solution from the generator 15. The dilute solution after heat exchange returns to the generator 15 to complete the solution heat cycle.

[0054] Furthermore, the absorption solution in the generator 15 is lithium bromide solution.

[0055] The high-pressure steam turbine 4 is coaxially connected to the low-pressure steam turbine 5, and the pipeline between the high-pressure steam turbine 4 and the low-pressure steam turbine 5 is a perforated extraction steam pipeline.

[0056] A method of using the above combined heat and power supply device is completed through the following steps:

[0057] Make the circulating steam enter the condenser 1 and be cooled into cooling water, which enters the feed water pump 2. Control the feed water pump 2 to transport the cooling water into the boiler 3 to absorb heat and become high-temperature and high-pressure steam, and then transport the high-temperature and high-pressure steam into the high-pressure steam turbine 4 to do work;

[0058] Open the high-low pressure connection pipe regulating valve 6 and the extraction steam valve 7;

[0059] The high-temperature extraction steam generated after the high-pressure steam turbine 4 does work is divided into two paths: one of the high-temperature extraction steam enters the low-pressure steam turbine 5 through the high-low pressure connection pipe regulating valve 6 to do work and then returns to the condenser 1; the other path of high-temperature extraction steam enters the absorption heat pump loop system through the perforated extraction steam pipeline and the extraction steam valve 7;

[0060] Transport the return water of the heat network into the absorber 9, the condenser 16 and the extraction steam heater 17 in sequence, and heat it in the extraction steam heater 17 and then output it as the heat network supply water;

[0061] Make the hot water generated by the solar water heater 8 enter the evaporator 19 for heat exchange, and then return to the solar water heater;

[0062] Open the generator regulating valve 13 and the heater regulating valve 14;

[0063] The high-temperature extraction steam entering the absorption heat pump loop system is further divided into two paths: one path of the high-temperature extraction steam enters the generator 15 through the generator regulating valve 13, exchanges heat with the lithium bromide solution in the generator 15, and is cooled to liquid water as the makeup water of the unit and flows out; the other part of the high-temperature extraction steam is transported into the extraction steam heater 17, and exchanges heat and releases heat by mixing with the return water of the heat network in the extraction steam heater 17, and is output as the heat network supply water;

[0064] Open the throttle valve 18 and the solution expansion valve 11;

[0065] The lithium bromide solution in the generator 15 absorbs the heat of the high-temperature extraction steam, evaporates the water in the lithium bromide solution into water vapor and enters the condenser 16, exchanges heat with the return water of the heat network from the absorber 9, converts the water vapor into liquid water and inputs it into the evaporator 19 through the throttle valve 18, makes the liquid water entering the evaporator 19 exchange heat with the hot water from the solar water heater 8, is converted into water vapor again and enters the absorber 9, and is absorbed by the concentrated solution in the absorber 9 to release heat to the return water of the heat network in the absorber 9;

[0066] The concentrated lithium bromide solution after water loss in the generator 15 is transported into the solution heat exchanger 12 for heat exchange, converts the high-temperature concentrated lithium bromide solution into a low-temperature concentrated lithium bromide solution, and then transports the low-temperature concentrated lithium bromide solution into the absorber 9 through the solution expansion valve 11, makes it absorb the water vapor from the evaporator 19 and become a dilute lithium bromide solution, and finally transports the dilute lithium bromide solution into the solution pump 10 to boost the pressure, and then transports it into the solution heat exchanger 12, makes it exchange heat with the high-temperature concentrated lithium bromide solution from the generator 15, and transports the heat-exchanged dilute lithium bromide solution back to the generator 15 to complete the solution heat cycle.

[0067] When the solar light is sufficient, the hot water provided by the solar water heater 8 has a higher temperature at this time. Increase the opening degrees of the generator regulating valve 13 and the extraction steam valve 7, and at the same time reduce the opening degree of the heater regulating valve 14, so as to increase the amount of high-temperature extraction steam entering the generator 15, accelerate the solution heat cycle, and increase the heat absorption capacity of the solar water heater 8. At the same time, reduce the amount of high-temperature extraction steam entering the extraction steam heater 17, so as to ensure that the heat network supply water flowing out of the extraction steam heater 17 reaches within a specific value of the supply water temperature.

[0068] When it is night or the solar light is insufficient, the hot water provided by the solar water heater 8 has a lower temperature. At this time, increase the opening degrees of the extraction steam valve 7 and the heater regulating valve 14, and at the same time reduce the opening degree of the generator regulating valve 13, reduce the amount of high-temperature extraction steam entering the evaporator 15, slow down the solution heat cycle, and then reduce the heat absorption capacity of the solar water heater 8, so as to increase the amount of high-temperature extraction steam entering the extraction steam heater 17, so as to ensure that the heat network supply water flowing out of the extraction steam heater 17 is maintained within a specific value.

[0069] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A combined heat and power device based on thermal power and solar energy, characterized in that: Including thermal power units and absorption heat pump circuit systems; The absorption heat pump circuit system comprises a solar water heater (8), a solution heat circulation unit and an extraction steam heater (17); The hot water generated by the solar water heater (8) enters the solution heat circulation unit for heat exchange and then returns to the solar water heater (8); The return water from the heating network is heated by the solution heat circulation unit and then enters the extraction steam heater (17) for heating and then output as the heating network supply water; The high-temperature extraction steam generated by the thermal power unit enters the absorption heat pump circuit system in two ways: one way of the high-temperature extraction steam enters the solution heat circulation unit for heat exchange and then returns to the thermal power unit as unit makeup water; the other way of the high-temperature extraction steam enters the extraction steam heater (17) for heat exchange with the heat network return water and then mixes with the heat network return water after heat exchange and outputs as heat network supply water; The solution heat circulation unit comprises an absorber (9), a solution pump (10), a solution heat exchanger (12), a generator (15), a condenser (16) and an evaporator (19); The heat network return water is sequentially heat exchanged in the absorber (9) and the condenser (16) before entering the steam extraction heater (17) to be output as heat network supply water; The hot water generated by the solar water heater (8) enters the evaporator (19) for heat exchange and then returns to the solar water heater (8); After the absorption solution in the generator (15) absorbs the heat of the high-temperature extraction steam generated by the thermal power unit, the water in the absorption solution evaporates and becomes water vapor. The water vapor enters the condenser (16) to exchange heat with the return water of the heat network, enters the evaporator (19) to exchange heat with the hot water from the solar water heater (8), and the water vapor after the heat exchange enters the absorber (9) to be absorbed by the concentrated solution in the absorber (9), releasing heat to the return water of the heat network in the absorber (9); the absorption solution in the generator (15) loses water and enters the solution heat exchanger (12) as a concentrated solution for heat exchange. The concentrated solution after the heat exchange enters the absorber (9), absorbs the water vapor in the absorber (9), and enters the solution heat exchanger (12) as a dilute solution through the solution pump (10) to exchange heat with the concentrated solution from the generator (15). The dilute solution after the heat exchange returns to the generator (15), completing the solution heat cycle.

2. The combined heat and power device according to claim 1, characterized in that: A steam extraction valve (7) is provided between the thermal power unit and the absorption heat pump circuit system.

3. The combined heat and power device according to claim 2, characterized in that: A generator regulating valve (13) is provided between the steam extraction valve (7) and the solution heat circulation unit.

4. The combined heat and power device according to claim 3, characterized in that: A heater regulating valve (14) is provided between the steam extraction valve (7) and the steam extraction heater (17).

5. The combined heat and power device according to claim 4, characterized in that: A throttle valve (18) is provided between the condenser (16) and the evaporator (19).

6. The combined heat and power device according to claim 5, characterized in that: A solution expansion valve (11) is provided between the concentrated solution output end of the solution heat exchanger (12) and the concentrated solution input end of the absorber (9).

7. A method for combined heat and power generation based on thermal power and solar energy, characterized in that: The combined heat and power generation device according to claim 6 is implemented by the following steps: Open the high- and low-pressure connecting pipe regulating valve (6) and the steam extraction valve (7); The high-temperature extraction steam generated by the thermal power unit is conveyed into the absorption heat pump circuit system through the extraction valve (7); The return water from the heating network is transported to the absorber (9) to absorb heat, and then transported to the condenser (16) and the extraction steam heater (17) in sequence, so that the return water is heated in the extraction steam heater (17) and then flows out as the supply water for the heating network; The hot water generated by the solar water heater (8) is transported to the evaporator (19) for heat exchange, and then transported back to the solar water heater; Open the generator regulating valve (13) and the heater regulating valve (14); The high-temperature extraction steam entering the absorption heat pump loop system is divided into two paths: one path of the high-temperature extraction steam is passed through the generator regulating valve (13) into the generator (15), and after heat exchange with the absorption solution in the generator (15), it is output as the unit makeup water; the other part of the high-temperature extraction steam is transported to the extraction steam heater (17), and mixed with the heat network return water in the extraction steam heater (17) to release heat, and is output as the heat network supply water; Open the throttle valve (18) and the solution expansion valve (11); The absorption solution in the generator (15) is heated by high-temperature extraction steam, so that the water in the absorption solution is evaporated into water vapor and enters the condenser (16) to exchange heat with the return water from the heat network from the absorber (9). The water vapor after the heat exchange is converted into liquid water and is input into the evaporator (19) through the throttle valve (18). The liquid water entering the evaporator (19) exchanges heat with the hot water from the solar water heater (8), and is converted into water vapor again and enters the absorber (9). The concentrated solution in the absorber (9) absorbs and releases heat to the return water of the heat network. The absorbed solution in the generator (15) loses water after heat exchange and is transported as a concentrated solution to the solution heat exchanger (12) for heat exchange. The concentrated solution after heat exchange is then transported to the absorber (9) through the solution expansion valve (11) to absorb water vapor from the evaporator (19) and become a dilute solution. Finally, the dilute solution is transported to the solution pump (10) for pressure increase and then transported to the solution heat exchanger (12) to exchange heat with the concentrated solution from the generator (15). The dilute solution after heat exchange is transported back to the generator (15) to complete the solution heat cycle.

8. The combined heat and power method according to claim 7, characterized in that: When the temperature of the hot water provided by the solar water heater (8) is high, the generator regulating valve (13) and the steam extraction valve (7) are adjusted to increase the opening of the generator regulating valve (13) and the steam extraction valve (7), and the heater regulating valve (14) is adjusted to reduce the opening of the heater regulating valve (14), thereby increasing the amount of high-temperature extraction steam entering the generator (15), accelerating the thermal cycle of the solution, and increasing the ability to absorb heat from the solar water heater (8). At the same time, the amount of high-temperature extraction steam entering the extraction heater (17) is reduced, thereby maintaining the hot network water supply flowing out of the extraction heater (17) within a specific value.

9. The combined heat and power method according to claim 7, characterized in that: When the temperature of the hot water provided by the solar water heater (8) is insufficient, the openings of the extraction valve (7) and the heater regulating valve (14) are adjusted to increase the openings of the extraction valve (7) and the heater regulating valve (14), and the generator regulating valve (13) is adjusted to reduce the opening of the generator regulating valve (13), thereby reducing the amount of high-temperature extraction steam entering the generator (15), slowing down the thermal cycle of the solution, and thereby reducing the ability to absorb heat from the solar water heater (8), increasing the amount of high-temperature extraction steam entering the extraction heater (17), and maintaining the water supply to the heat network flowing out of the extraction heater (17) within a specific value.

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