Photovoltaic thermal energy supply system based on low-temperature molten salt energy storage

Abstract

The utility model relates to the field of photovoltaic thermal energy supply technology, and discloses a photovoltaic thermal energy supply system based on low-temperature molten salt energy storage, including a heat storage box, a heating box fixedly spliced ​​on the heat storage box, a plurality of supporting feet arranged at the lower end of the heat storage box, a heat storage medium stored inside the heat storage box, a liquid inlet pipe and a liquid outlet pipe fixedly installed on the side wall of the heat storage box, an antifreeze liquid delivery assembly arranged inside the heat storage box, an AC heater connector arranged on the side wall of the heating box, a DC heater connector arranged on the top surface of the heating box, and an AC heater arranged on the heating box through the AC heater connector. The DC heater is connected to an external photovoltaic panel through a converter, and when the power provided by the photovoltaic panel is insufficient, the heating box is heated by the AC heater, and the heat is also stored by the heat storage medium in the heat storage box, providing heat energy to the terminal, thereby achieving the effect of making full use of solar energy renewable energy.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic thermal energy supply, and in particular to a photovoltaic thermal energy supply system based on low-temperature molten salt energy storage. Background Art

[0002] Most existing heating systems use electricity as a single energy source to heat the terminal, and renewable energy such as solar energy is not used reasonably. If solar energy is used as a single energy source, the heating system will be interrupted due to insufficient energy when there is insufficient sunlight. Therefore, the combination of solar energy and fixed energy is needed to continuously heat the terminal under different environments.

[0003] To this end, we propose a photovoltaic thermal energy supply system based on low-temperature molten salt energy storage. Utility Model Content

[0004] The utility model mainly solves the above-mentioned technical problems and provides a photovoltaic thermal energy supply system based on low-temperature molten salt energy storage.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a photovoltaic thermal energy supply system based on low-temperature molten salt energy storage, comprising a heat storage box, a heating box fixedly spliced ​​on the heat storage box, a plurality of supporting feet provided at the lower end of the heat storage box, a heat storage medium stored inside the heat storage box, a liquid inlet pipe and a liquid outlet pipe fixedly installed on the side wall surface of the heat storage box, an antifreeze liquid delivery assembly provided inside the heat storage box, the antifreeze liquid delivery assembly comprising a central pipe, the central pipe fixedly installed inside the heat storage box and coaxially arranged with the heat storage box;

[0006] A spirally coiled pipe is fixedly sleeved on the outer circumference of the central pipe, and the upper and lower ends of the spirally coiled pipe are fixedly connected to the central pipe and communicated with each other. A plurality of connecting branch pipes are fixedly installed equidistantly between the central pipe and the spirally coiled pipe.

[0007] Preferably, an AC heater connector is provided on the side wall surface of the heating box, and a DC heater connector is provided on the top surface of the heating box.

[0008] Preferably, an AC heater is provided on the heating box via an AC heater connector, and an external power grid provides power for the AC heater. A DC heater is provided on the heating box via a DC heater connector.

[0009] Preferably, the upper end of the central tube is fixedly connected to the liquid inlet pipe through a connecting elbow and communicates with each other.

[0010] Preferably, a liquid accumulation box is fixedly installed at the lower end of the central tube, and the side wall surface of the liquid accumulation box is fixedly connected to the liquid outlet pipe through the guide pipe and communicated with each other. The external antifreeze is introduced into the antifreeze delivery component distributed in the heat storage tank through the liquid inlet pipe, and the used antifreeze is discharged outward through the liquid outlet pipe. An antifreeze circulation pump is arranged on the external antifreeze delivery pipe, and the antifreeze circulation pump is used to circulate the antifreeze into the heat storage tank, thereby avoiding the low-temperature solid phase of the heat storage medium stored in the heat storage tank.

[0011] The utility model provides a photovoltaic thermal energy supply system based on low-temperature molten salt energy storage. It has the following beneficial effects:

[0012] (1) The photovoltaic thermal energy supply system based on low-temperature molten salt energy storage, when in use, is heated by a heating box. A heat storage medium is stored in the heat storage box. The heat storage medium is a carbide composite low-temperature molten salt. The heat storage medium in the heat storage box stores heat. The DC heater is connected to the external photovoltaic panel through a converter. When the power provided by the photovoltaic panel is insufficient, the AC heater is used to heat the heating box. Similarly, the heat is stored by the heat storage medium in the heat storage box to provide thermal energy for the terminal, thereby achieving the effect of making full use of solar energy renewable energy.

[0013] (2) In the photovoltaic thermal energy supply system based on low-temperature molten salt energy storage, when in use, the antifreeze liquid is introduced into the central tube through the connecting elbow. A part of the antifreeze liquid flowing downward along the central tube flows directly downward along the central tube, and the other part of the antifreeze liquid is guided to the interior of the spirally coiled tube through multiple groups of connecting branch pipes. In this way, the antifreeze liquid flows downward along the spirally coiled tube. Finally, the antifreeze liquid is discharged outward through the cooperation of the outlet pipe and the liquid outlet pipe. The antifreeze liquid circulates into the heat storage tank under the action of the antifreeze liquid circulation pump, thereby playing an antifreeze role for the heat storage medium in the heat storage tank. The contact area between the heat storage medium and the antifreeze liquid pipeline is increased by setting the spirally coiled tube and the connecting branch pipe, thereby achieving an efficient antifreeze effect for the heat storage medium.

[0014] (3) The photovoltaic thermal energy supply system based on low-temperature molten salt energy storage has the advantages of high and stable heat storage, no caking of molten salt, and long service life, because the heat storage medium is carbide composite low-temperature molten salt, and the carbide composite low-temperature molten salt undergoes a solid-liquid phase transition at around 60°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0017] Figure 1 This is a schematic diagram of the planar structure of the heat storage box and the heating box of the utility model;

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the heat storage box and the heating box of the utility model;

[0019] Figure 3 This is a schematic diagram of the position structure of the antifreeze liquid delivery component of the utility model;

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the antifreeze liquid delivery component of the utility model.

[0021] Legend:

[0022] 1. Heat storage box; 2. Heating box; 201. AC heater connector; 202. DC heater connector; 3. Support feet; 4. DC heater; 5. AC heater; 6. Heat storage medium; 7. Antifreeze delivery assembly; 701. Center pipe; 702. Connecting elbow; 703. Liquid accumulation box; 704. Lead-out pipe; 705. Spiral coiled pipe; 706. Connecting branch pipe; 8. Antifreeze circulation pump; 9. Liquid inlet pipe; 10. Liquid outlet pipe. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Example: Photovoltaic thermal energy supply system based on low-temperature molten salt energy storage, such as Figure 1-Figure 2As shown, it includes a heat storage box 1, a heating box 2 is fixedly spliced ​​on the heat storage box 1, and a plurality of supporting feet 3 are provided at the lower end of the heat storage box 1. An AC heater connector 201 is provided on the side wall of the heating box 2, and a DC heater connector 202 is provided on the top surface of the heating box 2. An AC heater 5 is provided on the heating box 2 through the AC heater connector 201. The external power grid provides power for the AC heater 5. A DC heater 4 is provided on the heating box 2 through the DC heater connector 202. When in use, heating is performed through the heating box 2. A heat storage medium 6 is stored in the heat storage box 1. The heat storage medium 6 is a carbide composite low-temperature molten salt. The heat storage medium 6 in the heat storage box 1 stores heat. The DC heater 4 is connected to an external photovoltaic panel through a converter. When the power provided by the photovoltaic panel is insufficient, the heating box 2 is heated through the AC heater 5. Similarly, heat is stored through the heat storage medium 6 in the heat storage box 1, which is convenient for providing heat energy to the terminal.

[0025] like Figure 2-Figure 3 As shown, the side walls of the heat storage tank 1 are respectively fixedly mounted with a liquid inlet pipe 9 and a liquid outlet pipe 10, and an antifreeze liquid delivery assembly 7 is arranged inside the heat storage tank 1. The antifreeze liquid delivery assembly 7 includes a central tube 701, which is fixedly mounted inside the heat storage tank 1 and is coaxially arranged with the heat storage tank 1. The upper end of the central tube 701 is fixedly connected to the liquid inlet pipe 9 through a connecting elbow 702 and communicates with each other, and a liquid accumulation box 703 is fixedly mounted on the lower end of the central tube 701. The side wall of the liquid accumulation box 703 is fixedly connected to the liquid outlet pipe 10 through the outlet pipe 704 and communicated with each other. The external antifreeze is introduced into the antifreeze delivery assembly 7 distributed in the heat storage tank 1 through the liquid inlet pipe 9. The used antifreeze is then discharged outward through the liquid outlet pipe 10. The external antifreeze delivery pipe is provided with an antifreeze circulation pump 8. The antifreeze circulation pump 8 is provided to circulate the antifreeze into the heat storage tank 1, thereby avoiding the low-temperature solid phase of the heat storage medium 6 stored in the heat storage tank 1.

[0026] like Figure 4As shown, the outer circumference of the central tube 701 is fixedly sleeved with a spirally coiled tube 705, and the upper and lower ends of the spirally coiled tube 705 are fixedly connected to the central tube 701 and communicated with each other. A plurality of connecting branch pipes 706 are equidistantly fixedly installed between the central tube 701 and the spirally coiled tube 705. When in use, the antifreeze liquid is introduced into the central tube 701 through the connecting elbow 702. A part of the antifreeze liquid flowing downward along the central tube 701 flows straight down along the central tube 701, and the other part of the antifreeze liquid flows through the plurality of connecting branch pipes 706. 6 is guided to the inside of the spirally coiled tube 705, so that the antifreeze liquid flows downward along the spirally coiled tube 705, and finally the antifreeze liquid is discharged outward through the cooperation of the outlet pipe 704 and the liquid outlet pipe 10. The antifreeze liquid circulates into the heat storage tank 1 under the action of the antifreeze liquid circulation pump 8, thereby playing an antifreeze role for the heat storage medium 6 in the heat storage tank 1. The contact area between the heat storage medium 6 and the antifreeze liquid pipeline is increased by the provision of the spirally coiled tube 705 and the connecting branch pipe 706, thereby playing an efficient antifreeze role for the heat storage medium 6.

[0027] The working principle of this utility model:

[0028] When in use, the antifreeze liquid is introduced into the central tube 701 through the connecting elbow 702. A part of the antifreeze liquid flowing downward along the central tube 701 flows straight down along the central tube 701, and the other part of the antifreeze liquid is guided to the inside of the spirally coiled tube 705 through multiple groups of connecting branch pipes 706, so that the antifreeze liquid flows downward in a spiral along the spirally coiled tube 705, and finally the antifreeze liquid is discharged outward through the cooperation of the outlet pipe 704 and the liquid outlet pipe 10. The antifreeze liquid circulates into the heat storage tank 1 under the action of the antifreeze liquid circulation pump 8, thereby having an antifreeze effect on the heat storage medium 6 in the heat storage tank 1. The contact area between the heat storage medium 6 and the antifreeze liquid pipeline is increased by the provision of the spirally coiled tube 705 and the connecting branch pipe 706, thereby having an efficient antifreeze effect on the heat storage medium 6.

[0029] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A photovoltaic thermal energy supply system based on low-temperature molten salt energy storage, comprising a heat storage tank (1), characterized in that: The heat storage box (1) is fixedly spliced ​​with a heating box (2), a DC heater (4) and an AC heater (5); a plurality of support legs (3) are provided at the lower end of the heat storage box (1); a heat storage medium (6) is stored inside the heat storage box (1); the heat storage medium (6) is a carbide composite low-temperature molten salt; a liquid inlet pipe (9) and a liquid outlet pipe (10) are respectively fixedly installed on the side wall surface of the heat storage box (1); an antifreeze liquid delivery component (7) is provided inside the heat storage box (1); the antifreeze liquid delivery component (7) comprises a central pipe (701); the central pipe (701) is fixedly installed inside the heat storage box (1) and is coaxially arranged with the heat storage box (1); A spirally coiled tube (705) is fixedly sleeved on the outer circumference of the central tube (701), and the upper and lower ends of the spirally coiled tube (705) are fixedly connected to the central tube (701) and communicate with each other. A plurality of connecting branch tubes (706) are fixedly installed at equal distances between the central tube (701) and the spirally coiled tube (705).

2. The photovoltaic thermal energy supply system based on low-temperature molten salt energy storage according to claim 1 is characterized in that: An AC heater connector (201) is provided on the side wall surface of the heating box (2), and a DC heater connector (202) is provided on the top surface of the heating box (2).

3. The photovoltaic thermal energy supply system based on low-temperature molten salt energy storage according to claim 1 is characterized in that: The AC heater (5) is fixedly mounted on the heating box (2) via an AC heater connector (201), and the DC heater (4) is fixedly mounted on the heating box (2) via a DC heater connector (202).

4. The photovoltaic thermal energy supply system based on low-temperature molten salt energy storage according to claim 1 is characterized in that: The upper end of the central tube (701) is fixedly connected to the liquid inlet pipe (9) via a connecting elbow (702) and communicates with each other.

5. The photovoltaic thermal energy supply system based on low-temperature molten salt energy storage according to claim 1 is characterized in that: A liquid collection box (703) is fixedly mounted on the lower end of the central tube (701), and the side wall surface of the liquid collection box (703) is fixedly connected to the liquid outlet pipe (10) through a guide pipe (704) and communicates with each other.

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