CN217817509U - Double-heat-pump complementary heat supply system based on solar energy coupling molten salt heat storage - Google Patents

Abstract

The utility model discloses a dual heat pump complementary heat supply system based on solar energy coupled molten salt heat storage, comprising: a solar heat collection module, a molten salt heat storage and release module, a heat pump heat supply module and a micro grid module. The solar heat collection module is used to convert the collected solar energy into heat energy; the molten salt heat storage and release module is connected with the solar heat collection module to store the heat of the solar heat collection module in molten salt; the heat pump heating module includes absorption heat pump and The compression heat pump, the molten salt heat storage module is also used to drive the absorption heat pump with high temperature molten salt for heating; the micro grid module is used to supply power to the molten salt heat storage module to heat the molten salt, and is also used to drive the compression heat pump heating. The heating system proposed by the embodiment of the utility model improves the utilization rate of solar energy, realizes energy cascade utilization, makes the matching relationship between solar energy and fluctuating user heat loads reach an effective balance, and makes full use of new energy sources to ensure the safety and reliability of the heating system .

Description

Dual heat pump complementary heating system based on solar energy coupling molten salt heat storage

technical field

The utility model belongs to the technical field of clean heat supply, in particular to a dual heat pump complementary heat supply system based on solar energy coupled with molten salt heat storage.

Background technique

Solar energy is a non-polluting renewable energy. The "solar energy +" clean heating utilization mode has emerged in the heating industry. The "solar energy +" clean heating mode mainly includes photovoltaic and photothermal. However, solar energy resources are only concentrated and abundant during the day, and have the disadvantage of fluctuation throughout the day, so the heating capacity of solar energy cannot fully meet the heat load demand of users. Only using solar energy as an energy source will cause the following problems, such as insufficient heat storage temperature, poor adaptability to load fluctuations, and opposite characteristics of heating capacity and load demand, etc., resulting in high system construction costs and poor heating effects.

Utility model content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. For this reason, the embodiment of the utility model proposes a dual heat pump complementary heating system based on solar energy coupled with molten salt heat storage.

The dual heat pump complementary heating system based on solar energy coupled molten salt heat storage in the embodiment of the utility model includes: a solar heat collection module, a molten salt heat storage and release module, a heat pump heating module and a microgrid module;

The solar heat collection module is used to convert the collected solar energy into thermal energy;

The molten salt heat storage and release module is connected to the solar heat collection module for storing the heat of the solar heat collection module in the molten salt;

The heat pump heating module includes an absorption heat pump and a compression heat pump, and the molten salt heat storage and release module is also used to drive the absorption heat pump to supply heat by using high-temperature molten salt;

The micro-grid module is used to supply power to the molten salt heat storage and release module to heat the molten salt, and is also used to drive the compression heat pump to supply heat, and the micro-grid module is connected to the grid.

The dual heat pump complementary heating system based on solar energy coupled with molten salt heat storage proposed by the embodiment of the utility model converts solar light to heat, and at the same time is equipped with molten salt heat storage, so that the solar energy can be spread and utilized for 24 hours, and the utilization rate of solar energy is improved. The driving energy of the absorption heat pump and the compression heat pump are different, and the absorption heat pump and the compression heat pump are complementary to realize energy cascade utilization, improve the flexibility of system operation adjustment and improve the heating capacity of the system at the same time. This system uses a molten salt heat storage module with high density, low cost, high thermal efficiency, and a small equipment footprint for inter-period heat storage and regulation of waste heat, reducing system cost and improving operational reliability. Through the coupling of solar heat collection module, molten salt heat storage and release module, heat pump heating module and micro grid module, the matching relationship between the highly fluctuating solar energy and the hourly fluctuating user heat load can be effectively balanced, and the new energy can be fully utilized. Energy guarantees the safety and reliability of the heating system.

In some embodiments, the microgrid module includes a new energy power generation device, and the new energy power generation device is electrically connected to both the molten salt heat storage and release module and the compression heat pump.

In some embodiments, the new energy power generation device is a solar photovoltaic panel, the micro grid module further includes a photovoltaic inverter and a distribution box, the solar photovoltaic panel is electrically connected to the photovoltaic inverter, and the The photovoltaic inverter is used to convert electrical energy into alternating current and output it. Both the photovoltaic inverter and the grid are electrically connected to the distribution box, and the distribution box is used to store and release heat to the molten salt module and The compression heat pump distributes electricity.

In some embodiments, the solar heat collection module includes a heat exchange loop and a solar heat collector and a heat exchanger connected in the heat exchange loop, and the molten salt heat storage and release module is connected to the heat exchanger The cold side is connected, and the heat exchanger is used to transfer the heat of the solar heat collection module to the molten salt through the heat exchange medium in the heat exchange circuit.

In some embodiments, the heat exchange medium is heat conduction oil, and the solar heat collection module further includes a heat conduction oil expansion tank and a heat conduction oil pump connected in series in the heat exchange circuit.

In some embodiments, the solar collector is a trough solar collector.

In some embodiments, the molten salt heat storage and release module includes a molten salt heater, a low-temperature molten salt tank and a high-temperature molten salt tank, and the molten salt heater is connected in parallel with the heat exchanger in the low-temperature molten salt tank Between the outlet of the high-temperature molten salt tank and the inlet of the high-temperature molten salt tank, the micro-grid module is electrically connected to the molten salt heater, and the heat pump heating module is connected between the outlet of the high-temperature molten salt tank and the low-temperature molten salt tank. Between the entrances to the salt shakers.

In some embodiments, a heat network circulating water circuit is included, and the heat pump heating module is connected to the heat network circulating water circuit for heating the circulating water.

In some embodiments, the circulating water circuit of the heating network includes a hot water return pipe and a hot water supply pipe, and the absorption heat pump and the compression heat pump are connected in parallel between the hot water return pipe and the hot water supply pipe Between, the hot water supply pipe is used to provide hot water to the user side.

In some embodiments, the absorption heat pump is a lithium bromide absorption heat pump.

Description of drawings

Fig. 1 is a schematic structural diagram of a dual heat pump complementary heating system based on solar energy coupled with molten salt heat storage proposed by an embodiment of the present invention.

Reference signs:

Heating system 100; photovoltaic panel 10; inverter 11; mains power 12; centralized distribution box 13; heat exchange circuit 20; solar collector 21; heat exchanger 22; thermal oil expansion tank 23; thermal oil pump 24; Molten salt circuit 30; low temperature molten salt tank 31; high temperature molten salt tank 32; low temperature molten salt pump 33; high temperature molten salt pump 34; molten salt heater 35; first evaporator 40; absorber 41; solution heat exchanger 42 Generator 43; Solution pump 44; First condenser 45; Compressor 50; Second evaporator 51; Second condenser 52; Heat pump loop 54; Expansion valve 55; Hot water return pipe 60; Hot water supply pipe 61.

Detailed ways

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

The following describes the dual heat pump complementary heating system 100 based on solar energy coupling molten salt heat storage according to the embodiment of the present invention according to Fig. 1. The heating system 100 includes: solar heat collection module, molten salt heat storage and release module, heat pump heating module and Microgrid module.

The solar collector module is used to convert the collected solar energy into thermal energy. The molten salt heat storage and release module is connected with the solar heat collection module, which is used to store the heat of the solar heat collection module in the molten salt of the molten salt heat storage and release module, that is, the solar heat collection module uses the light and heat in the solar energy to increase The temperature of the molten salt in the molten salt heat storage and release module converts light and heat into thermal energy and stores it in the molten salt.

The heat pump heating module includes absorption heat pumps and compression heat pumps, and the molten salt heat storage and release module is also used to drive the absorption heat pump with high-temperature molten salt for heat supply, that is to say, the molten salt heat storage and release module uses the energy stored in the molten salt The thermal energy is used as an absorption heat pump to provide a high-temperature heat source, and the absorption heat pump is driven to heat the return water in the heat network circulation channel of the heating system.

The micro-grid module is used to supply power to the molten salt heat storage and release module to heat the molten salt, and is also used to drive the compression heat pump to supply heat. The micro-grid module is connected to the grid. The device provides electrical energy.

The operation mode of the dual heat pump complementary heating system 100 based on solar energy coupling molten salt heat storage proposed by the embodiment of the utility model is as follows:

The solar thermal collection module is used to absorb the light and heat in the solar energy, and heat the molten salt in the molten salt heat storage and release module with thermal energy, that is, store the thermal energy in the molten salt. When the system is turned on, the molten salt heat storage and release module uses the heat energy in the molten salt to drive the absorption heat pump in the heat pump heating module, and the absorption heat pump heats the water in the heat network circulating waterway to provide heat for users. When the heat load of the user increases or the heat storage capacity of the molten salt heat storage and release module is insufficient, the microgrid module drives the compression heat pump through the grid to participate in heating the water in the circulating water circuit of the heat network to provide heat for the user to meet the heat load demand of the user.

The dual heat pump complementary heating system based on solar energy coupled with molten salt heat storage proposed by the embodiment of the utility model converts solar light to heat, and at the same time is equipped with molten salt heat storage, so that the solar energy can be spread and utilized for 24 hours, and the utilization rate of solar energy is improved. The driving energy of the absorption heat pump and the compression heat pump are different, and the absorption heat pump and the compression heat pump are complementary to realize energy cascade utilization, improve the flexibility of system operation adjustment and improve the heating capacity of the system at the same time. This system uses a molten salt heat storage module with high density, low cost, high thermal efficiency, and a small equipment footprint for inter-period heat storage and regulation of waste heat, reducing system cost and improving operational reliability. Through the coupling of solar heat collection module, molten salt heat storage and release module, heat pump heating module and micro grid module, the matching relationship between the highly fluctuating solar energy and the hourly fluctuating user heat load can be effectively balanced, and the new energy can be fully utilized. Energy guarantees the safety and reliability of the heating system.

The following describes a dual heat pump complementary heating system 100 based on solar energy coupled with molten salt heat storage in a specific embodiment provided by the present invention according to FIG. 1 . As shown in FIG. 1 , the heat supply system 100 includes a solar heat collection module, a molten salt heat storage and release module, a heat pump heat supply module and a microgrid module. Among them, the solar heat collection module and the micro-grid module provide energy for the heat pump heating module in the heating system to heat the circulating water of the heating network, and the molten salt heat storage and release module is used to store the energy in the solar heat collection module and the micro-grid module , so that the heating system 100 can balance the highly fluctuating solar energy and the hourly fluctuating user heat load.

The micro-grid module includes a new energy power generation device, which is electrically connected to the molten salt heat storage and release module and a compression heat pump. The new energy power generation device uses new energy to generate electricity, which is energy-saving and environmentally friendly. Optionally, the new energy power generation device may be a solar photovoltaic panel 10 that utilizes solar energy to generate electricity, or a wind turbine that utilizes wind energy to generate electricity, which is not limited by the present invention.

Specifically, in this embodiment, the new energy power generation device is a solar photovoltaic panel 10, and the photovoltaic panel 10 converts solar energy into electrical energy under the irradiation of the sun, and completes photoelectric conversion of solar energy. The DC power converted by the photovoltaic panel 10 can be converted into AC power that can be used by the equipment through the inverter 11 . In order to meet the stability of micro-grid power supply and overcome the fluctuation of solar power generation, the mains 12 (grid) and solar power generation equipment are connected to the centralized distribution box 13 at the same time, and the centralized distribution box 13 is connected with the molten salt heat storage and release module and the compression The heat pumps are all electrically connected to provide electric energy for the molten salt heat storage and release module and the compression heat pump.

As shown in FIG. 1 , the solar heat collection module includes a heat exchange circuit 20 , a solar heat collector 21 and a heat exchanger 22 connected in the heat exchange circuit 20 , and a heat exchange medium circulates in the heat exchange circuit 20 . The solar thermal collector 21 is used to collect solar energy and convert the solar energy into heat. In other words, the solar thermal collector 21 absorbs thermal energy in the solar energy to heat the heat exchange medium in the heat exchange circuit 20 to complete photothermal conversion of the solar energy.

Further, the hot side of the heat exchanger 22 is connected to the heat exchange circuit 20, and the cold side of the heat exchanger 22 is connected with the molten salt heat storage and release module. The heat exchanger 22 is used to transfer the heat of the solar heat collection module to the molten salt in the molten salt heat storage and release module through the heat exchange medium in the heat exchange circuit 20, that is, the heat exchange medium circulating in the heat exchange circuit 21 The heat in the solar heat collector 21 is transferred to the hot side of the heat exchanger 22, and the heat is transferred to the molten salt on the cold side of the heat exchanger 22 through the heat exchanger 22, so as to realize the heat storage and release of the molten salt by the solar heat collection module Module heating.

Specifically, the heat exchange medium in the solar heat collection module may be heat transfer oil, and the solar heat collection module further includes a heat transfer oil expansion tank 23 and a heat transfer oil pump 24 connected in series in the heat exchange circuit 20 . The heat transfer oil expansion tank 23 can protect the heat transfer oil heat exchange circuit 20, prolong the life of the heat transfer oil, and indirectly protect the heat exchanger 22, the heat transfer oil pump 24 and other equipment. The heat transfer oil pump 24 provides circulating power for the heat transfer oil in the heat exchange circuit 20 .

Optionally, the solar heat collector 21 in the solar heat collection module may be a trough type solar heat collector or a flat plate type solar heat collector, which is not limited in the present invention.

In the solar heat collection module, the heat conduction oil circulates in the heat exchange circuit 20 through the action of the heat conduction oil pump 24. When the heat conduction oil passes through the solar heat collector 21, it absorbs the light and heat collected by the solar heat collector 21, and the heat conduction oil passes through the heat exchanger. At 22 o'clock, the heat is transferred to the molten salt heat storage and release module in the heat exchanger 22 as a heat source.

In the embodiment of the utility model, the molten salt heat storage and release module is used to store heat energy, and the molten salt heat storage and release module includes a molten salt circuit 30 , a molten salt heater 35 , a low-temperature molten salt tank 31 and a high-temperature molten salt tank 32 . The low-temperature molten salt tank 31 and the high-temperature molten salt tank 32 are respectively used for storing the low-temperature molten salt after heat release and the high-temperature molten salt after heat exchange. The molten salt heater 30 and the heat exchanger 22 are connected in parallel between the outlet of the low-temperature molten salt tank 31 and the inlet of the high-temperature molten salt tank 32. It can be understood that the molten salt heater 30 and the heat exchanger 22 all serve to The molten salt in the molten salt heat storage and release module is heated. In actual work, one of the molten salt heater 30 and the heat exchanger 22 can separately heat the molten salt in the molten salt heat storage and release module. The molten salt may be heated at the same time. The molten salt heater 30 is electrically connected to the microgrid module, and the microgrid module provides electric energy for the molten salt heater 30 . The excess electric energy generated by the new energy generating device of the microgrid is used to supply power to the molten salt heater 30, so that the electric energy can be converted into thermal energy in the molten salt exothermic module that can be stored.

As shown in Figure 1, in the molten salt heat storage and release module, a low-temperature molten salt pump 33 and a high-temperature molten salt pump 34 are also included, and the low-temperature molten salt pump 33 and the high-temperature molten salt pump 34 are used to drive the molten salt in the molten salt storage. cycle through the thermal module. In the respective parallel branches of the molten salt heater 30 and the heat exchanger 22, each branch also includes several cut-off valves and electric regulating valves, which are used to control the flow of molten salt in the parallel branches. flow, and protect the stability of each device in the molten salt heat storage and release module.

The dual heat pump complementary heating system 100 proposed in the embodiment of the present invention based on solar energy coupling molten salt heat storage also includes a heat pump heating module and a heating network circulating water circuit, and the heat pump heating module is connected to the heating network circulating water circuit and heats the heating network The hot water in the circulating water circuit, that is to say, the heat pump heating module in the heating system 100 has the function of heating the circulating water circuit of the heating network. As shown in FIG. 1 , the circulating water circuit of the heating network includes a hot water return pipe 60 and a hot water supply pipe 61 .

Further, the heat pump heating module includes an absorption heat pump and a compression heat pump, and the absorption heat pump and the compression heat pump are connected in parallel in the circulating water circuit of the heat network, so that both the absorption heat pump and the compression heat pump can heat the water in the circulating water circuit of the heat network. Hot water, and the two can be heated separately, or they can heat the circulating water circuit of the heating network at the same time. Specifically, as shown in Figure 1, the hot water return pipe 60 communicates with each of the absorption heat pump and the compression heat pump. The hot water supply pipe 61 flows to the user side.

Specifically, in the embodiment of the present utility model, as shown in FIG. 1 , the absorption heat pump is a lithium bromide absorption heat pump. The lithium bromide absorption heat pump mainly includes an evaporator 40 , an absorber 41 , a solution heat exchanger 42 , a generator 43 , a solution pump 44 and a condenser 45 .

The working principle of the lithium bromide absorption heat pump is as follows: First, due to the negative pressure in the evaporator 40, the refrigerant in the evaporator 40, i.e. water, can evaporate in the evaporator 40 at a relatively low temperature, thereby absorbing the waste heat. Then, the lithium bromide concentrated solution in the absorber 41 absorbs the refrigerant from the evaporator 40, that is, the steam generated by the evaporator 40, and the refrigerant liquefies in the lithium bromide solution to release heat, and releases latent heat to the heat network circulating water in the absorber 41 The heating network water in the loop, the heating network water realizes the first temperature rise, and at the same time, the concentrated solution in the absorber 41 will become a dilute solution, and after being heated up by the solution heat exchanger 42, it enters the generator 43 under the action of the solution pump 44 . Then, the heat source steam is driven in the generator 43 to heat the lithium bromide solution, the water vapor evaporates, and the lithium bromide solution becomes a concentrated solution, and the concentrated solution enters the absorber 41 for reabsorption after passing through the solution heat exchanger 42 . Finally, the refrigerant evaporated in the generator 43, that is, steam, enters the condenser 45 to liquefy and release heat, and heats the heating network water in the heating network circulating water circuit in the pipe to realize the second temperature rise of the heating network water. Enter evaporator 40 after being condensed into liquid refrigerant water in 45. Repeatedly, the cycle operation of the absorption heat pump is realized. The generator 43 of the absorption heat pump unit is connected to the molten salt circuit 30 in the molten salt heat storage and release module, and is located between the outlet of the high-temperature molten salt tank 32 and the inlet of the low-temperature molten salt tank 31. The high-temperature molten salt in the high-temperature molten salt tank 32 The salt provides a heat source for the generator 43, heats the lithium bromide solution in the absorption heat pump, and promotes the cycle operation of the absorption heat pump.

The compression heat pump in the embodiment of the utility model includes: a working fluid, a compressor 50 , an evaporator 51 , a condenser 52 , a heat pump loop 54 and an expansion valve 55 , and the working fluid circulates in the compression heat pump loop 54 . The working principle of the compression heat pump is as follows: First, the low-temperature and low-pressure working fluid passes through the evaporator 51 and absorbs heat to vaporize under the environment of a low-level heat source; the working fluid enters the compressor 50 and forms high-temperature and high-pressure steam under the action of the compressor 50; then Entering the condenser 52 to liquefy and release heat, release the latent heat to the heating network water in the circulating water circuit of the heating network, and finally restore it to a low-temperature and low-pressure liquid through the expansion valve 55, forming a cycle. The compressor 50 of the compression heat pump is connected to the micro grid module, and the micro grid module provides electric energy for the compressor 50 .

When the dual heat pump complementary heating system 100 based on solar energy coupled molten salt heat storage proposed by the embodiment of the utility model provides heat, different operating modes are adopted in sequence from small to large heat loads, as follows:

During the daytime, the solar photovoltaic panel 10 generates electricity, and the inverter 11 outputs usable alternating current, which is supplied to the compression heat pump through the distribution box 13, and drives the compression heat pump to extract low-grade heat from the air to heat the circulating water circuit of the heating network, thereby externally heating. Under the premise of satisfying the user’s heat load, the redundant power generated by the photovoltaic panel 10 supplies power to the molten salt heater 35, and the molten salt heater 35 heats the molten salt in the molten salt circuit 30, and converts the heat in the form of high-temperature molten salt Stored in the high temperature molten salt storage tank 32.

At the same time during the day, the solar heat collector 21 collects solar energy and converts the solar energy into thermal energy, and heats the heat transfer oil in the heat exchange loop 20, and transfers heat to the molten salt in the molten salt loop 30 through the heat exchanger 22, and the Heat is stored in the high-temperature molten salt storage tank 32 in the form of high-temperature molten salt.

As the heat load of heat users increases gradually and/or the intensity of solar radiation decreases, when the compression heat pump driven by photovoltaic power generation cannot meet the heat load of users, high-temperature molten salt-driven absorption heat pumps are used to extract low-grade heat energy in the air to participate in heating.

When the light intensity drops further and/or there is no light at night, the compression heat pump driven by the power generated by the photovoltaic panel 10 cannot meet the heat load of the user, and the molten salt heat storage module starts to release heat, and the high-temperature molten salt is used to drive the absorption heat pump The low-grade heat energy in the air participates in heating, and the heating mode at this time can provide complementary heating for dual heat pumps.

As the light intensity drops further or when there is no light at night, the power generated by the photovoltaic panel 10 is not enough to support the operation of the compression heat pump. The complementary heating mode of dual heat pumps is gradually converted to molten salt-driven absorption heat pumps participating in heating independently.

When the heat stored in the molten salt heat storage and release module is not enough to meet the heat load of the user, the absorption heat pump stops operating, and the commercial power 12 is used to drive the compression heat pump to supply heat alone.

When there is no light in extreme weather and the heat storage capacity of the molten salt is insufficient, and the compression heat pump driven by the commercial power 12 is still unable to meet the heat load of the user, the heating system 100 can use the commercial power 12 to supply power to the molten salt heater 35, and the molten salt heats The device 35 heats the molten salt and drives the absorption heat pump to jointly participate in heat supply, so as to meet the heat load demand of users under extreme working conditions.

The dual heat pump complementary heating system 100 based on solar energy coupling molten salt heat storage proposed by the embodiment of the utility model has the following advantages:

Efficiently couple the two solar energy utilization methods of photothermal conversion and photoelectric conversion, use the molten salt storage system to obtain energy from solar energy, and use the molten salt heat storage method as a medium to balance the relationship between solar energy collection and heat load and electrothermal conversion in the system , to balance the hourly fluctuating solar thermal output power with the user’s hourly fluctuating heat load, so that the solar energy concentrated during the day can be spread out for 24 hours of utilization, improving the utilization rate of solar energy, reducing heating costs and pollutant emissions .

Complementary absorption heat pumps and compression heat pumps with different driving energies will improve the flexibility of system operation and adjustment while improving heating capacity, realize energy cascade utilization, and further promote new energy consumption. At the same time, it responds well to the random fluctuations of solar heat collection and power generation equipment to provide continuous and stable heat output to ensure the heat load demand on the user side. The matching relationship between the highly volatile solar energy and the hourly fluctuating user heat load can be effectively balanced, and the new energy can be fully utilized to ensure the safety and reliability of the heating system.

The utility model is configured with a molten salt heat storage tank with high energy storage density, low cost, high thermal efficiency, and a small equipment footprint to adjust waste heat across time intervals, reduce system cost, improve operation reliability, and can also eliminate redundancy Photovoltaic power generation.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" The orientation or positional relationship indicated by , "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying the referred device Or elements must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrated; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components , unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature through an intermediary indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In this disclosure, the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean specific features, structures, materials described in connection with the embodiment or example Or features are included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary, and should not be construed as limitations of the present invention, and those of ordinary skill in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (10)

1. A double-heat-pump complementary heat supply system based on solar energy coupling molten salt heat storage is characterized by comprising: the system comprises a solar heat collection module, a molten salt heat storage and discharge module, a heat pump heat supply module and a microgrid module;

the solar heat collection module is used for converting the collected solar energy into heat energy;

the molten salt heat accumulation and discharge module is connected with the solar heat collection module and is used for storing the heat of the solar heat collection module in the molten salt;

the heat pump heat supply module comprises an absorption heat pump and a compression heat pump, and the molten salt heat storage and discharge module is also used for driving the absorption heat pump to supply heat by utilizing high-temperature molten salt;

the micro-grid module is used for supplying power to the molten salt heat storage and discharge module so as to heat molten salt and is also used for driving the compression heat pump to supply heat, and the micro-grid module is connected with a power grid.

2. The solar-energy-coupled molten salt heat storage-based dual heat pump complementary heat supply system according to claim 1, wherein the microgrid module comprises a new energy power generation device electrically connected with both the molten salt heat storage and discharge module and the compression heat pump.

3. The solar-coupled molten salt heat storage-based dual-heat-pump complementary heat supply system according to claim 2, wherein the new energy power generation device is a solar photovoltaic panel, the microgrid module further comprises a photovoltaic inverter and a distribution box, the solar photovoltaic panel is electrically connected with the photovoltaic inverter, the photovoltaic inverter is used for converting electric energy into alternating current and outputting the alternating current, the photovoltaic inverter and the power grid are both electrically connected with the distribution box, and the distribution box is used for distributing power to the molten salt heat storage and release module and the compression heat pump.

4. The solar-coupled molten salt heat storage-based dual heat pump complementary heat supply system of claim 1, wherein the solar heat collection module comprises a heat exchange loop, and a solar heat collector and a heat exchanger connected in the heat exchange loop, the molten salt heat storage and discharge module is communicated with the cold side of the heat exchanger, and the heat exchanger is used for transferring heat of the solar heat collection module to molten salt through a heat exchange medium in the heat exchange loop.

5. The solar-coupled molten salt heat storage-based dual-heat-pump complementary heat supply system according to claim 4, wherein the heat exchange medium is heat transfer oil, and the solar heat collection module further comprises a heat transfer oil expansion tank and a heat transfer oil pump which are connected in series in the heat exchange loop.

6. The solar-coupled molten salt heat storage-based dual heat pump complementary heat supply system of claim 4, wherein the solar collector is a trough solar collector.

7. The solar-coupled molten salt heat storage-based dual heat pump complementary heat supply system according to claim 4, wherein the molten salt heat accumulation and discharge module comprises a molten salt heater, a low-temperature molten salt tank and a high-temperature molten salt tank, the molten salt heater and the heat exchanger are connected in parallel between an outlet of the low-temperature molten salt tank and an inlet of the high-temperature molten salt tank, the microgrid module is electrically connected with the molten salt heater, and the heat pump heat supply module is connected between an outlet of the high-temperature molten salt tank and an inlet of the low-temperature molten salt tank.

8. The solar-coupled molten salt heat storage-based dual-heat-pump complementary heat supply system according to claim 1, comprising a heat supply network circulating water loop, wherein the heat pump heat supply module is connected to the heat supply network circulating water loop for heating circulating water.

9. The solar-energy-coupled molten salt heat storage-based dual-heat-pump complementary heat supply system according to claim 8, wherein the heat supply network circulating water loop comprises a hot water return pipe and a hot water supply pipe, the absorption heat pump and the compression heat pump are connected in parallel between the hot water return pipe and the hot water supply pipe, and the hot water supply pipe is used for supplying hot water to a user side.

10. The solar-coupled molten salt heat storage-based dual heat pump complementary heat supply system of claim 1, wherein the absorption heat pump is a lithium bromide absorption heat pump.

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