Park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines and its scheduling method

Abstract

The present invention discloses a park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines and its scheduling method, which belongs to the technical field related to park energy supply. The proposed solution adopts an energy supply scheme that combines photovoltaic-thermal and internal combustion engines. Through the three-network integration of the power grid, hot water pipe network, and steam pipe network and its reasonable power generation, storage, and utilization scheduling strategy, it ensures that renewable energy (photovoltaic and thermal) is maximally utilized for power generation and heating at different times throughout the day. At the same time, by putting into use the internal combustion generator sets during reasonable periods, it not only ensures the reliable supply of electric energy but also guarantees the reliable supply of hot water and steam.

Description

Technical Field

[0001] The present invention relates to the technical field of energy supply in industrial parks, and particularly to an energy supply system for industrial parks based on the complementarity of photovoltaic-thermal and internal combustion engines and its scheduling method. Background Art

[0002] In areas with rich sunlight resources, photovoltaic power generation is usually used for power supply, and some projects also use solid heat storage electric boilers for heating. However, solid heat storage usually uses high-voltage electric heating wires to heat high-temperature magnesia bricks, which has certain safety risks.

[0003] The inventor found that simply using photovoltaic energy supply (including power supply, heating, etc.) has certain unreliability; at the same time, during the process of heating or supplying steam in industrial parks, when multiple heat sources are used for comprehensive utilization, there will be problems such as the timeliness of cooperation between heat sources and unreasonable energy configuration, resulting in energy waste. How to coordinate and control multiple heat sources and how to control each heat source internally to make it in the optimal working state are urgent problems to be solved currently. Summary of the Invention

[0004] To solve the deficiencies of the prior art, the present invention discloses an energy supply system for industrial parks based on the complementarity of photovoltaic-thermal and internal combustion engines and its scheduling method. The solution can not only meet the high-reliability power supply requirements of industrial parks, but also reasonably supply heating hot water, domestic hot water, and industrial steam according to the energy level matching principle.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An energy supply system for industrial parks based on the complementarity of photovoltaic-thermal and internal combustion engines disclosed in one or more embodiments includes:

[0007] A solar heating subsystem, which includes a solar water heater and a solar molten salt heat collection module;

[0008] A hot water circulation subsystem, which is used to heat part of the cold water in the cold water tank through the solar water heater and then enter the hot water tank; alternatively, part of the cold water is heated by passing through the jacket water heat exchanger of the internal combustion generator set and the flue gas waste heat utilization hot water boiler connected to the flue gas of the internal combustion generator set in sequence, and then enters the hot water tank; part of the hot water in the hot water tank returns to the cold water tank after dissipating heat through the hot water pipe network and the hot water heat users connected to the hot water pipe network.

[0009] A steam circulation subsystem, which is used to send part of the hot water in the hot water tank into a steam generation system, heat the hot water into steam based on the solar molten salt heat collection module and enter the steam header; the steam in the steam header returns to the cold water tank after dissipating heat through the steam pipe network and the steam heat users connected to the steam pipe network.

[0010] The photovoltaic power generation subsystem includes: a photovoltaic power generation device that converts solar energy into electrical energy and stores it in an electrical energy storage device.

[0011] As an optional method, part of the cold water in the cold water tank passes through the jacket water heat exchanger of the internal combustion generator set and the flue gas waste heat utilization steam boiler connected to the flue gas of the internal combustion generator set in sequence, is heated into steam, and enters the steam header.

[0012] As an optional method, the steam header can also be replaced by a steam main pipe.

[0013] Further, the internal combustion generator set includes a diesel generator set, a gasoline generator set or a gas generator set.

[0014] Further, the hot water circulation subsystem further includes: part of the cold water in the cold water tank is heated into hot water by a hot water energy storage electric boiler and enters the hot water tank, and the hot water energy storage electric boiler is connected to the electrical energy storage device.

[0015] Further, the steam circulation subsystem further includes: as an alternative, part of the hot water is heated into steam by the flue gas waste heat utilization steam boiler connected to the flue gas of the internal combustion generator set and enters the steam header;

[0016] Or,

[0017] Part of the hot water in the hot water tank is heated into steam by a steam electric boiler and enters the steam header, and the steam electric boiler is connected to the electrical energy storage device.

[0018] Further, the solar molten salt heat collection module includes a cold molten salt tank, a hot molten salt tank and a solar energy absorber. Part of the cold molten salt in the cold molten salt tank is heated into hot molten salt by the solar energy absorber and then enters the hot molten salt tank. Part of the cold molten salt is heated into hot molten salt by a molten salt energy storage electric heater and then enters the hot molten salt tank. The molten salt energy storage electric heater is connected to the electrical energy storage device.

[0019] Further, the solar energy absorber adopts a tower-type molten salt absorber or a trough-type molten salt absorber.

[0020] Further, when a tower-type molten salt absorber is adopted, the absorber adopts a form of an absorber tube screen, and the absorber tube screen is located at the top of the absorber tower. The heliostats reflect solar energy to the absorber tube screen. When a trough-type molten salt absorber is adopted, the absorber adopts a form of an absorber tube, and the absorber tube is arranged in parallel with the trough-type collector. The trough-type collector reflects solar energy to the absorber tube.

[0021] Furthermore, a steam turbine back-pressure generator set is arranged between the steam generating system and the steam manifold. The steam generated by the steam generating system is converted into low-temperature and low-pressure steam or high-temperature and high-pressure steam through the steam turbine back-pressure generator set and transported to the steam manifold.

[0022] A scheduling method for a park energy supply system based on photovoltaic, thermal and internal combustion engine complementation disclosed in one or more embodiments is based on the above-mentioned park energy supply system based on photovoltaic, thermal and internal combustion engine complementation, including:

[0023] During the period when the solar radiation is greater than or equal to the preset threshold, the following steps are adopted: the solar water heater collector operates at maximum power, heats the cold water in the cold water tank to hot water to the maximum extent and stores it in the hot water tank; the solar heat absorber operates at maximum power, heats the cold molten salt in the cold molten salt tank to hot molten salt to the maximum extent and stores it in the hot molten salt tank; the photovoltaic power generation subsystem operates at maximum power, and the generated electric energy is supplied to the power users in the park through the external power grid, and the remaining electric energy is stored in the electric energy storage device; the hot water tank is connected to the hot water network to supply hot water; the steam manifold is connected to the steam network to supply steam;

[0024] During the period when the solar radiation is less than the preset threshold, the following steps are adopted: the steam manifold is connected to the steam pipe network to supply steam to steam heat users; the hot water in the hot water tank is supplied to hot water heat users through the hot water pipe network.

[0025] Furthermore, when there is surplus electricity generated by photovoltaic power and the electric energy storage device has not yet stored the maximum amount of electricity, the surplus electricity generated by photovoltaic power is stored in the electric energy storage device;

[0026] or,

[0027] When there is surplus electricity generated by photovoltaic power and the electric energy storage device has stored the maximum amount of electricity, the first-level surplus electricity of the electric energy storage device is transmitted to the molten salt energy storage electric heater to heat the cold molten salt into hot molten salt, and the hot molten salt is stored in the hot molten salt tank; since the transmission of the first-level surplus electricity of the electric energy storage device to the molten salt energy storage electric heater is a process of continuous output of electricity, if the surplus electricity generated by photovoltaic power is no longer stored in the electric energy storage device, it is easy to cause the electric energy storage device to no longer have the maximum amount of electricity, so the surplus electricity generated by photovoltaic power is synchronously stored in the electric energy storage device;

[0028] or,

[0029] When there is surplus electrical energy generated by the photovoltaic system, the electrical energy storage device is stored to its maximum capacity, and the amount of cold molten salt remaining in the cold molten salt tank at a certain moment is less than or equal to the molten salt amount for solar thermal heating potential at that moment, the cold salt pump for electric heating and the molten salt energy storage electric heater stop operating, and the cold water pump for electric heating and the hot water energy storage electric boiler are started. The secondary surplus power of the electrical energy storage device is transmitted to the hot water energy storage electric boiler to heat cold water into hot water and store the hot water in the hot water tank. Since transmitting the secondary surplus power of the electrical energy storage device to the molten salt energy storage electric heater is a process of continuously outputting electrical energy, if the surplus power generated by the photovoltaic system is no longer stored in the electrical energy storage device, it is likely to cause the electrical energy storage device not to be at its maximum capacity. Therefore, the surplus power generated by the photovoltaic system is synchronously stored in the electrical energy storage device.

[0030] Further, when it is judged that the hot water storage in the hot water tank is sufficient during the remaining period, and the amount of hot molten salt cannot meet the demand for steam heating, but the stored electricity of the electrical energy storage device can meet the preset steam heating requirement, the steam electric boiler is started to heat the hot water into steam; when it is judged that the amount of hot molten salt cannot meet the demand for steam heating during the remaining period, and the stored electricity of the electrical energy storage device also cannot meet the preset steam heating requirement, the internal combustion generator set and the flue gas waste heat utilization steam boiler are started to heat the hot water into steam;

[0031] When it is judged that the hot water storage in the hot water tank is insufficient, but the stored electricity of the electrical energy storage device meets the preset hot water heating requirement, the hot water energy storage electric boiler is started to heat the cold water into hot water; when it is judged that the hot water storage in the hot water tank is insufficient, and the stored electricity of the electrical energy storage device also cannot meet the preset hot water heating requirement, the internal combustion generator set, the cylinder jacket water heat exchanger and the flue gas waste heat utilization hot water boiler are started to heat the cold water into hot water.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] (1) The present invention provides a park energy supply system based on the complementarity of photovoltaic and solar thermal energy and an internal combustion engine, and its dispatching method. The proposed solution adopts an energy supply scheme that combines photovoltaic and solar thermal energy with an internal combustion engine. Through the three-network integration of the power grid, hot water pipe network, and steam pipe network and its reasonable power generation, storage, and utilization dispatching strategy, it ensures that renewable energy (photovoltaic and solar thermal) is maximally utilized for power generation and heating at different times throughout the day. At the same time, through the use of a diesel generator at reasonable times, it not only ensures the reliable supply of electrical energy but also ensures the reliable supply of hot water and steam.

[0034] (2) The solution of the present invention realizes dual-network heating of a hot water pipe network and a steam pipe network through segmented heating. Among them, the low-level hot water heating solves the heat storage problem with a hot water tank, and the high-level steam heating solves the heat storage problem with a molten salt tank. Since the heat storage cost of the hot water tank is low and the operation and maintenance are simple, while the heat storage cost of molten salt is high and electric tracing is required during operation to prevent solidification, the solution of the present invention saves equipment material costs and operation and maintenance costs compared with the full use of molten salt heat storage.

[0035] (3) In the solution of the present invention, the diesel generator adopts segmented flue gas waste heat utilization. Part of it is used to supply hot water, and part of it is used to supply steam, maximizing the satisfaction of the demand for high-quality and low-quality heating.

[0036] (4) Since the scale of each equipment system in the solution of the present invention is moderate, especially with segmented heat absorption. Since the present invention stores solar energy separately according to hot water and molten salt, and the two storage and utilization processes are interrelated. Whether the molten salt absorber is a tower-type molten salt absorber or a trough-type molten salt absorber, it can be achieved that the solar water collector with lower cost shares the heat absorption amount of the molten salt absorber with higher cost, and the hot water heat storage with lower cost shares the heat storage amount of the molten salt heat storage with higher cost. Therefore, the investment in high-temperature resistant materials with higher cost is reduced, and the investment in molten salt with higher cost is reduced.

[0037] (5) When the solar energy absorber of the solar molten salt heat collection module of the present invention adopts a tower-type molten salt absorber, since the absorber tower belongs to a high-rise structure with relatively high construction difficulty, and the solution of the present invention reduces the proportion of the molten salt absorber in the sum of the molten salt absorber and the hot water collector through segmented heating. Therefore, the area of the heliostat field is reduced, the height of the absorber tower is reduced, the construction difficulty of the absorber tower is reduced, and it is easier to construct in areas with harsh weather conditions. For example, it is suitable for construction in high-altitude areas.

[0038] (6) The solution of the present invention adds a steam turbine back-pressure generator set between the steam generation system and the steam header. When low-temperature and low-pressure steam needs to be supplied externally, the steam generation system first generates medium-temperature and medium-pressure steam or high-temperature and high-pressure steam and then reduces it to low-temperature and low-pressure steam through the steam turbine back-pressure generator set. On the one hand, the power generation is increased, and on the other hand, during the heat exchange process between the molten salt and the steam, it is not easy for the molten salt to solidify.

[0039] Advantages of additional aspects of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic structural diagram of a park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines described in Embodiment 1 of the present invention;

[0041] Figure 2 This is a schematic structural diagram of a park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines described in the second embodiment of the present invention;

[0042] Wherein: 1. Cold water tank; 2. Hot water tank; 3. Solar water heater; 4. Steam generation system; 5. Solar heat absorber; 6. Cold molten salt tank; 7. Hot molten salt tank; 8. Steam header; 9. Internal combustion generator set; 10. Cylinder jacket water heat exchanger of internal combustion generator set; 11. Flue gas waste heat utilization steam boiler; 12. Flue gas waste heat utilization hot water boiler; 13. Chimney; 14. Hot water energy storage electric boiler; 15. Steam electric boiler; 16. Molten salt energy storage electric heater; 17. Electric energy storage device; 18. Power grid; 19. Steam pipeline network; 20. Hot water pipeline network; 21. Heliostat; 22. Photovoltaic power generation device; 23. Steam turbine back pressure generator set; The "□" in the figure represents a water pump, represents a molten salt pump, represents the flow direction of liquid, gas or electric energy. Specific embodiments

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] In the case of no conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0047] Embodiment 1:

[0048] The purpose of this embodiment is to provide a park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines.

[0049] As Figure 1As shown in the figure, this embodiment provides a park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines, including: a cold water tank 1, a hot water tank 2, a hot water circulation subsystem, a steam circulation subsystem, an internal combustion generator set 9, a photovoltaic power generation subsystem, and a solar heating subsystem; where:

[0050] The solar heating subsystem includes: a solar water heater 3 and a solar molten salt heat collection module;

[0051] The hot water circulation subsystem includes: a part of the cold water in the cold water tank 1 is heated by the solar water heater 3 and then enters the hot water tank 2; alternatively, a part of the cold water is heated by passing through the jacket water heat exchanger 10 of the internal combustion generator set 9 and the flue gas waste heat utilization hot water boiler 12 connected to the flue gas of the internal combustion generator set in sequence, and then enters the hot water tank 2; where the flue gas of the internal combustion generator set 9 passes through the flue gas waste heat utilization steam boiler 11 and the flue gas waste heat utilization hot water boiler 12 in sequence; or directly passes through the flue gas waste heat utilization hot water boiler 12; a part of the hot water in the hot water tank 2 is supplied to the hot water users through the hot water pipe network 20, and the hot water is cooled into cold water in the hot water users and returns to the cold water tank 1;

[0052] The steam circulation subsystem includes: a part of the hot water in the hot water tank 2 enters the steam generation system 4 through a feed water pump, and the hot water is heated into steam based on the solar molten salt heat collection module and enters the steam header 8; alternatively, a part of the hot water is heated into steam by the flue gas waste heat utilization steam boiler 11 connected to the flue gas of the internal combustion generator set 9 and enters the steam header 8; the steam in the steam header 8 is supplied to the steam users through the steam pipe network 19, and the steam is cooled into liquid water in the steam users and returns to the cold water tank 1;

[0053] The photovoltaic power generation subsystem includes: a photovoltaic power generation device 22 converts solar energy into electric energy and stores it in an electric energy storage device.

[0054] As an optional method, a part of the cold water in the cold water tank passes through the jacket water heat exchanger of the internal combustion generator set and the flue gas waste heat utilization steam boiler connected to the flue gas of the internal combustion generator set in sequence, is turned into steam, and enters the steam header.

[0055] As an optional method, the steam header can also be replaced by a steam main pipe.

[0056] Furthermore, the internal combustion generator set includes a diesel generator set, a gasoline generator set or a gas generator set, and the gas generator set can use natural gas, liquefied petroleum gas, biogas, coal gas, etc. as fuels.

[0057] Further, the solar molten salt heat collection module includes a cold molten salt tank 6, a hot molten salt tank 7, and a solar energy absorber 5. Part of the cold molten salt in the cold molten salt tank 6 is heated to hot molten salt by the solar energy absorber 5 and then enters the hot molten salt tank 7. Part of the cold molten salt is heated to hot molten salt by the molten salt energy storage electric heater 15 and then enters the hot molten salt tank 7. Among them, the cold molten salt in the cold molten salt tank 6 is transported to the solar energy absorber 5 by a cold molten salt pump. The sunlight of the sun is reflected by the heliostat 21 onto the solar energy absorber, heating the cold molten salt to hot molten salt. The hot molten salt is collected in the hot molten salt tank. The molten salt in the hot molten salt tank is transported to the steam generation system 4 by a hot molten salt pump to heat the hot water into steam. Among them, as Figure 1 , Figure 2 shown, the solar energy absorber 5 can adopt a tower-type molten salt absorber or a trough-type molten salt absorber. When adopting a tower-type molten salt absorber, the absorber adopts a form of heat absorption tube screen, and the heat absorption tube screen is located at the top of the heat absorption tower. The solar energy is reflected by the heliostat onto the heat absorption tube screen. When adopting a trough-type molten salt absorber, the absorber adopts a form of heat absorption tube, and the heat absorption tube is arranged in parallel with the trough-type collector. The solar energy is reflected by the trough-type collector onto the heat absorption tube.

[0058] Further, the hot water circulation subsystem further includes: Part of the cold water in the cold water tank 1 is heated to hot water by the hot water energy storage electric boiler 14 and enters the hot water tank 2. The hot water energy storage electric boiler 14 is connected to the electric energy storage device 17.

[0059] Further, the steam circulation subsystem further includes: Part of the hot water in the hot water tank 2 is heated to steam by the steam electric boiler 15 and enters the steam header 8. The steam electric boiler 15 is connected to the electric energy storage device 17.

[0060] Further, the molten salt energy storage electric heater 16 is connected to the electric energy storage device 17.

[0061] Further, the photovoltaic panels in the photovoltaic power generation subsystem absorb solar energy to generate electricity directly, and the electric energy is stored in the electrochemical energy storage. The hourly solar radiation data has large fluctuations. Therefore, the photovoltaic power generation also has large fluctuations. The fluctuating photovoltaic power generation is converted into relatively stable electric energy for external output through the electrochemical energy storage. Among them, part of the electric energy is output to the molten salt energy storage electric heater 16, and the molten salt energy storage electric heater 16 heats the cold molten salt coming from the cold molten salt tank 6 through the cold salt pump into hot molten salt and stores it in the hot molten salt tank 7. Part of the electric energy is output to the hot water energy storage electric boiler 14. Part of the electric energy is output to the steam electric boiler 15.

[0062] Embodiment 2:

[0063] The purpose of this embodiment is to provide another park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines.

[0064] As Figure 2 shown, this embodiment provides a campus energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines, including: a cold water tank 1, a hot water tank 2, a hot water circulation subsystem, a steam circulation subsystem, an internal combustion generator set 9, a photovoltaic power generation subsystem, and a solar heating subsystem; where:

[0065] The solar heating subsystem includes: a solar water heater 3 and a solar molten salt heat collection module;

[0066] The hot water circulation subsystem includes: a part of the cold water in the cold water tank 1 is heated by the solar water heater 3 and then enters the hot water tank 2; alternatively, a part of the cold water is heated by passing through the cylinder jacket water heat exchanger 10 of the internal combustion generator set 9 and the flue gas waste heat utilization hot water boiler 12 connected to the flue gas of the internal combustion generator set 9 in sequence, and then enters the hot water tank 2; a part of the hot water in the hot water tank 2 returns to the cold water tank 1 after being dissipated by the hot water pipe network 20 and its connected hot water heat users;

[0067] The steam circulation subsystem includes: a part of the hot water in the hot water tank 2 enters the steam generation system 4, and the hot water is heated to steam based on the solar molten salt heat collection module and enters the steam header 8; a part of the hot water is heated to steam by the flue gas waste heat utilization steam boiler 11 connected to the flue gas of the internal combustion generator set 9 and enters the steam header 8; the steam in the steam header 8 returns to the cold water tank 1 after being dissipated by the steam pipe network 19 and its connected steam heat users;

[0068] Wherein, a steam turbine backpressure generator set 23 is arranged between the steam generation system 4 and the steam header 8, and the steam generated by the steam generation system 4 passes through the steam turbine backpressure generator set 23 to convert medium-temperature and medium-pressure steam or high-temperature and high-pressure steam into low-temperature and low-pressure steam and transport it to the steam header 8; the electric energy generated by the steam turbine backpressure generator set 23 is transported to the external power grid 18;

[0069] The photovoltaic power generation subsystem includes: a photovoltaic power generation device 22 converts solar energy into electric energy and stores it in an electric energy storage device 17.

[0070] Furthermore, the electricity generated by the steam turbine backpressure generator set 23 is directly transported to the power grid 18 and is not connected to the electric energy storage device 17, because the amount of electricity generated by the steam turbine backpressure generator set 23 is not large and is used as the basic load for external power supply without energy storage.

[0071] Furthermore, other technical details of the solution in this embodiment are the same as those in Embodiment 1. Since other technical details have been described in detail in Embodiment 1, they will not be elaborated here.

[0072] Embodiment 3:

[0073] The purpose of this embodiment is to provide a scheduling method for a park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines.

[0074] A scheduling method for a park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines, which is based on the above-mentioned park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines, includes:

[0075] During the period when the solar irradiance is greater than or equal to the preset threshold, the following steps are adopted: The solar water heater operates at the maximum power to heat the cold water in the cold water tank into hot water to the maximum extent and store it in the hot water tank; the solar heat absorber operates at the maximum power to heat the cold molten salt in the cold molten salt tank into hot molten salt to the maximum extent and store it in the hot molten salt tank; the photovoltaic power generation subsystem operates at the maximum power, and the generated electric energy is supplied to the park electricity users through the external power grid. For the remaining electric energy, it is stored in the electric energy storage device; the hot water tank is connected to the hot water pipe network to supply hot water to the hot water users; the steam header is connected to the steam pipe network to supply steam to the steam heat users.

[0076] During the period when the solar irradiance is less than the preset threshold, the following steps are adopted: The steam header is connected to the steam pipe network to supply steam to the steam heat users; the hot water in the hot water tank is supplied to the hot water users through the hot water pipe network.

[0077] Specifically:

[0078] During the period with good solar irradiance (that is, the period when the solar irradiance is greater than or equal to the preset threshold, and the value of the preset threshold is obtained through calculation, and its specific calculation method will be described below), the following steps are executed:

[0079] Step 1: The solar water heater works at the maximum power to heat the cold water in the cold water tank into hot water to the maximum extent and store the hot water in the hot water tank;

[0080] Step 2: The heliostat and the heat absorber work at the maximum power to heat the cold molten salt in the cold molten salt tank into hot molten salt to the maximum extent and store the hot molten salt in the hot molten salt tank;

[0081] Step 3: The photovoltaic works at the maximum power to generate electricity to the maximum extent, and the power of the photovoltaic is supplied to the electricity users in the park through the power grid;

[0082] Specifically, when the electricity users in the park cannot consume the electricity generated by the photovoltaic system, the surplus electricity generated by the photovoltaic system is stored in the electrical energy storage device; further, when the electricity users in the park cannot consume the electricity generated by the photovoltaic system and the electrical energy storage device has been stored to its maximum capacity, the surplus electricity generated by the photovoltaic system is stored in the electrical energy storage device, and the first-level surplus electricity of the electrical energy storage device is transported to the molten salt energy storage electric heater to heat the cold molten salt into hot molten salt, and the hot molten salt is stored in the hot molten salt tank; further, predict the solar radiation in the remaining time period of this day, and according to the solar radiation in the remaining time period of this day, predict the molten salt amount of the solar thermal heating potential that can heat the cold molten salt into hot molten salt relying on the solar thermal energy in step 2. When the electricity users in the park cannot consume the electricity generated by the photovoltaic system, and the electrical energy storage device has been stored to its maximum capacity, and the remaining cold molten salt amount in the cold molten salt tank at a certain moment is less than or equal to the molten salt amount of the solar thermal heating potential at that moment, the cold salt pump for electric heating and the molten salt energy storage electric heater stop operating, and then the cold water pump for electric heating and the hot water energy storage electric boiler are started, and the second-level surplus electricity of the electrical energy storage device is transported to the hot water energy storage electric boiler to heat the cold water into hot water, and the hot water is stored in the hot water tank.

[0083] Step 4: The hot water tank is connected to the hot water pipe network to supply hot water; the steam generation system is connected to the steam pipe network through the steam header to supply steam.

[0084] During the period with poor solar irradiance (i.e., the period when the solar irradiance is less than the preset threshold, such as rainy days, nights, etc.), the following steps are executed:

[0085] Step 1: The steam generation system is connected to the steam pipe network through the steam header to supply steam to the steam heat users;

[0086] Specifically, after prediction, when the hot water storage in the hot water tank is sufficient, and the molten salt amount in the hot molten salt tank is insufficient in the remaining time period, and the stored electricity of the electrical energy storage device is surplus in the remaining time period (i.e., the actual stored electricity of the electrical energy storage device at this moment is greater than the minimum stored electricity required by the electrical energy storage device in the remaining time period), the hot water pump for electric heating and the steam electric boiler are started to heat the hot water in the hot water tank into steam, and the steam is supplied to the steam heat users through the steam header connected to the steam pipe network; after prediction, when the molten salt amount in the remaining time period is insufficient and the stored electricity of the electrical energy storage device in the remaining time period is also insufficient, the internal combustion generator set and the flue gas waste heat utilization steam boiler are started to heat the hot water in the hot water tank into steam, and the steam is supplied to the steam heat users through the steam header connected to the steam pipe network.

[0087] Step 2: The hot water in the hot water tank is supplied to the hot water users through the hot water pipe network;

[0088] Specifically, it is predicted that when the hot water storage in the hot water tank is insufficient during the remaining period and the stored electricity in the electrical energy storage device is surplus during the remaining period, the cold water pump for electric heating and the hot water storage electric boiler are started to heat the cold water in the cold water tank into hot water and supply the hot water to the hot water users through the hot water pipe network; it is predicted that when the hot water storage in the hot water tank is insufficient during the remaining period and the stored electricity in the electrical energy storage device is also insufficient during the remaining period, the internal combustion generator set, the cylinder jacket water heat exchanger and the hot water boiler utilizing flue gas waste heat are started to heat the cold water in the cold water tank into hot water and supply the hot water to the hot water users through the hot water pipe network.

[0089] Further, when determining the minimum stored electricity required by the electrical energy storage device during the remaining period, it is divided into three steps: the first step is to first predict the total amount of electrical energy directly supplied required during the remaining period of a day; the second step is to predict the total amount of electrical energy supply required for converting electrical energy into heat energy (including the sum of the heat energies required for hot water and steam) during the remaining period of a day; the third step is to sum up the total amount of electrical energy directly supplied required predicted in the first step and the total amount of electrical energy supply required for converting electrical energy into heat energy to obtain the minimum stored electricity required by the electrical energy storage device during the remaining period of a day.

[0090] Further, that the stored electricity in the electrical energy storage device is surplus during the remaining period means that: the actual stored electricity of the electrical energy storage device at this moment is greater than the minimum stored electricity required by the electrical energy storage device during the remaining period of a day. That the stored electricity in the electrical energy storage device is insufficient during the remaining period means that: the actual stored electricity of the electrical energy storage device at this moment is less than or equal to the minimum stored electricity required by the electrical energy storage device during the remaining period of a day.

[0091] Although the specific implementation manners of the present invention are described above in conjunction with the drawings, it is not a limitation on the protection scope of the present invention. Those skilled in the art should understand that based on the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A campus energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines, characterized in that Comprising: A solar heating subsystem, which includes a solar water heater and a solar molten salt heat collection module; A hot water circulation subsystem, which is used to heat part of the cold water in the cold water tank through the solar water heater and then enter the hot water tank; Alternatively, part of the cold water is sequentially heated by the jacket water heat exchanger of the internal combustion generator set and the flue gas waste heat utilization hot water boiler connected to the flue gas of the internal combustion generator set, and then enters the hot water tank; Part of the hot water in the hot water tank returns to the cold water tank after being dissipated by the hot water pipe network and the hot water heat users connected to the hot water pipe network; Part of the cold water in the cold water tank is sequentially heated by the jacket water heat exchanger of the internal combustion generator set and the flue gas waste heat utilization steam boiler connected to the flue gas of the internal combustion generator set to become steam, and then enters the steam header; A steam circulation subsystem, which is used to send part of the hot water in the hot water tank into the steam generation system, heat the hot water to steam based on the solar molten salt heat collection module and enter the steam header; The steam in the steam header returns to the cold water tank after being dissipated by the steam pipe network and the steam heat users connected to the steam pipe network; A steam turbine backpressure generator set is arranged between the steam generation system and the steam header, and the steam generated by the steam generation system passes through the steam turbine backpressure generator set to convert medium-temperature medium-pressure steam or high-temperature high-pressure steam into low-temperature low-pressure steam and transport it to the steam header; The solar molten salt heat collection module includes a cold molten salt tank, a hot molten salt tank and a solar heat absorber. Part of the cold molten salt in the cold molten salt tank is heated to hot molten salt by the solar heat absorber and then enters the hot molten salt tank. Part of the cold molten salt is heated to hot molten salt by the molten salt energy storage electric heater and then enters the hot molten salt tank; A photovoltaic power generation subsystem, which includes: a photovoltaic power generation device converts solar energy into electrical energy and stores it in an electrical energy storage device; The steam circulation subsystem further includes: part of the hot water in the hot water tank is heated to steam by a steam electric boiler and enters the steam header, and the steam electric boiler is connected to the electrical energy storage device; When there is surplus electrical energy generated by the photovoltaic system and the electrical energy storage device has been stored to the maximum power, the first-level surplus power of the electrical energy storage device is transmitted to the molten salt energy storage electric heater for heating cold molten salt into hot molten salt and storing the hot molten salt in the hot molten salt tank; Since the process of transmitting the first-level surplus power of the electrical energy storage device to the molten salt energy storage electric heater is a continuous power output process, if the surplus power generated by the photovoltaic system is no longer stored in the electrical energy storage device, it is easy to cause the electrical energy storage device to no longer be at the maximum power. Therefore, the surplus power generated by the photovoltaic system is synchronously stored in the electrical energy storage device; When it is judged that the hot water storage in the hot water tank is sufficient in the remaining period, and the amount of molten salt cannot meet the steam heating demand, but the stored power of the electrical energy storage device can meet the preset steam heating requirements, start the steam electric boiler to heat the hot water to steam; When it is judged that the amount of molten salt cannot meet the steam heating demand in the remaining period, and the stored power of the electrical energy storage device also cannot meet the preset steam heating requirements, start the internal combustion generator set and the flue gas waste heat utilization steam boiler to heat the hot water to steam; When it is determined that the hot water storage in the hot water tank is insufficient, but the stored electricity of the electric energy storage device meets the preset hot water heating requirement, the hot water energy storage electric boiler is started to heat cold water into hot water; when it is determined that the hot water storage in the hot water tank is insufficient and the stored electricity of the electric energy storage device also fails to meet the preset hot water heating requirement, the internal combustion generator set, the cylinder jacket water heat exchanger and the flue gas waste heat utilization hot water boiler are started to heat cold water into hot water.

2. The park energy supply system based on photovoltaic thermal energy and internal combustion engine complementation as claimed in claim 1 is characterized in that: The hot water circulation subsystem further includes: part of the cold water in the cold water tank is heated into hot water by the hot water energy storage electric boiler and enters the hot water tank, and the hot water energy storage electric boiler is connected to the electric energy storage device.

3. The park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines according to claim 1, wherein The hot water circulation subsystem further includes: The steam header can be replaced by a steam main pipe.

4. The park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines as claimed in claim 1, wherein The steam circulation subsystem further includes: As an alternative, part of the hot water is heated into steam by the flue gas waste heat utilization steam boiler connected to the flue gas of the internal combustion generator set and enters the steam header.

5. The park energy supply system based on photovoltaic thermal energy and internal combustion engine complementation as claimed in claim 1, characterized in that: The flue gas of the internal combustion generator set sequentially passes through the flue gas waste heat utilization steam boiler and the flue gas waste heat utilization hot water boiler. The flue gas waste heat utilization steam boiler uses the flue gas waste heat to convert the hot water from the hot water tank into steam and enters the steam header; the flue gas waste heat utilization hot water boiler uses the flue gas waste heat to further heat the cylinder jacket water heated by the cylinder jacket water heat exchanger of the internal combustion generator set and sends it into the hot water tank.

6. The park energy supply system based on photovoltaic thermal energy and internal combustion engine complementation as claimed in claim 1, characterized in that: Directly pass through the flue gas waste heat utilization hot water boiler.

7. The park energy supply system based on photovoltaic thermal energy and internal combustion engine complementation as claimed in claim 1, characterized in that: The solar molten salt heat collection module includes a cold molten salt tank, a hot molten salt tank and a solar heat absorber. Part of the cold molten salt in the cold molten salt tank is heated into hot molten salt by the solar heat absorber and enters the hot molten salt tank, and part of the cold molten salt is heated into hot molten salt by the molten salt energy storage electric heater and enters the hot molten salt tank.

8. The park energy supply system based on photovoltaic thermal energy and internal combustion engine complementation as claimed in claim 7 is characterized in that: The molten salt energy storage electric heater is connected to the electric energy storage device; the electric energy generated by the internal combustion generator set is stored in the electric energy storage device.

9. The park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engine according to claim 7, characterized in that The solar heat absorber adopts a tower-type molten salt heat absorber or a trough-type molten salt heat absorber.

10. The park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engine according to claim 7, characterized in that When a tower-type molten salt heat absorber is adopted, the heat absorber adopts a heat absorption tube screen form, and the heat absorption tube screen is located at the top of the heat absorption tower, and the solar energy is reflected to the heat absorption tube screen by the heliostat; when a trough-type molten salt heat absorber is adopted, the heat absorber adopts a heat absorption tube form, and the heat absorption tube is arranged in parallel with the trough-type collector, and the solar energy is reflected to the heat absorption tube by the trough-type collector.

11. The park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engine according to claim 7, characterized in that The internal combustion generator set includes a diesel generator set, a gasoline generator set or a gas generator set.

12. A scheduling method for a park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines, characterized in that, Based on a park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engine according to any one of claims 1-11, it includes: During the period when the solar irradiance is greater than or equal to the preset threshold, the following steps are adopted: The solar water heater operates at the maximum power to heat the cold water in the cold water tank into hot water to the maximum extent and store it in the hot water tank; The solar heat absorber operates at the maximum power to heat the cold molten salt in the cold molten salt tank into hot molten salt to the maximum extent and store it in the hot molten salt tank; The photovoltaic power generation subsystem operates at the maximum power, and the generated electric energy is supplied to the power users in the park through the external power grid. For the remaining electric energy, it is stored in the electric energy storage device; The hot water tank is connected to the hot water pipe network to supply hot water to the hot water users; The steam header is connected to the steam pipe network to supply steam to the steam users; During the period when the solar irradiance is less than the preset threshold, the following steps are adopted: The steam header is connected to the steam pipe network to supply steam to the steam users; The hot water in the hot water tank is supplied to the hot water users through the hot water pipe network.

13. The scheduling method of a park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines according to claim 12, characterized in that, When there is surplus electric energy generated by the photovoltaic system and the electric energy storage device has not been stored to the maximum charge, the surplus electric power generated by the photovoltaic system is stored in the electric energy storage device.

14. The scheduling method of a park energy supply system based on the complementarity of photovoltaic-thermal and internal combustion engines according to claim 12, characterized in that : When there is surplus electric energy generated by the photovoltaic system, the electric energy storage device has been stored to the maximum charge, and the remaining cold molten salt in the cold molten salt tank at a certain moment is less than or equal to the molten salt amount of the solar thermal heating potential at that moment, the cold salt pump for electric heating and the molten salt energy storage electric heater stop operating, and the cold water pump for electric heating and the hot water energy storage electric boiler are started. The secondary surplus electric power of the electric energy storage device is transported to the hot water energy storage electric boiler to heat the cold water into hot water and store the hot water in the hot water tank; Since transporting the secondary surplus electric power of the electric energy storage device to the hot water energy storage electric boiler is a process of continuously outputting electric energy, if the surplus electric power generated by the photovoltaic system is no longer stored in the electric energy storage device, it is easy to cause the electric energy storage device not to be at the maximum charge. Therefore, the surplus electric power generated by the photovoltaic system is synchronously stored in the electric energy storage device.

Images