Multi-energy complementary greenhouse soil heat preservation system based on phase change energy storage

Abstract

The invention provides a multi-energy complementary greenhouse soil thermal insulation system based on phase change energy storage, which belongs to the technical field of agricultural facility and energy comprehensive utilization, and comprises a greenhouse body, a dye-sensitized solar power generation device, a wind power generation device, a bidirectional DC / AC converter, a boiler intelligent heating module, a lithium battery energy storage module and an intelligent thermal insulation soil module. The dye-sensitized solar power generation device is fixedly installed on the top of the greenhouse body, the wind power generation device is arranged on one side of the top of the greenhouse body, the bidirectional DC / AC converter is arranged in the greenhouse body, the boiler intelligent heating module and the lithium battery energy storage module are arranged on the outer side of the greenhouse body, and the intelligent heat preservation soil module is arranged in the greenhouse body. The dye-sensitized solar power generation device, the wind power generation device and the intelligent heat preservation soil module are all connected with the boiler intelligent heating module, and the lithium battery energy storage module is connected with the dye-sensitized solar power generation device and the wind power generation device in parallel through the bidirectional DC / AC converter. The energy utilization efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of agricultural facilities and energy comprehensive utilization, and particularly relates to a multi-energy complementary greenhouse soil heat preservation system based on phase change energy storage. BACKGROUND

[0002] Traditional greenhouses rely on conventional energy for heating and cooling, and have problems such as high energy consumption, serious pollution, and low environmental control precision. Although renewable energy (such as photovoltaic and wind power) has been tried in the agricultural field, there are defects such as difficulty in storage and deployment, and poor coordination between greenhouse temperature and humidity control and energy supply. At the same time, single temperature control means (such as relying only on heating and ventilation) cannot cope with complex environmental changes, which restricts the stable and high yield of crops. Therefore, it is urgent to build a multi-energy complementary, energy storage adaptive, and intelligent control greenhouse system to solve the problems of energy and environmental control. SUMMARY

[0003] The purpose of the present application is to provide a multi-energy complementary greenhouse soil heat preservation system based on phase change energy storage, which can accurately control the greenhouse environment, improve energy utilization efficiency, and promote the development of intelligent agriculture.

[0004] To achieve the above purpose, the present application provides the following technical scheme: A multi-energy complementary greenhouse soil heat preservation system based on phase change energy storage, characterized in that it comprises a greenhouse body, a dye-sensitized solar power generation device, a wind power generation device, a bidirectional DC / AC converter, a boiler intelligent heating module, a lithium battery energy storage module, and an intelligent heat preservation soil module.

[0005] The dye-sensitized solar power generation device is fixedly installed at the top of the greenhouse body, the wind power generation device is arranged on one side of the top of the greenhouse body, the bidirectional DC / AC converter is arranged inside the greenhouse body, the boiler intelligent heating module and the lithium battery energy storage module are arranged outside the greenhouse body, and the intelligent heat preservation soil module is arranged inside the greenhouse body. The dye-sensitized solar power generation device, the wind power generation device, and the intelligent heat preservation soil module are connected with the boiler intelligent heating module, and the lithium battery energy storage module is connected with the dye-sensitized solar power generation device and the wind power generation device in parallel through the bidirectional DC / AC converter.

[0006] The intelligent heat preservation soil module is divided into a crop planting and cultivation layer, a buffer layer, a U-shaped phase change heat exchanger pipe network, a glass fiber cloth reinforcement layer, an anti-seepage heat preservation layer, and a foundation from top to bottom. The U-shaped phase change heat exchanger pipe network is fixed between the buffer layer and the glass fiber cloth reinforcement layer by a pipe network buckle.

[0007] Further, the U-shaped phase change heat pipe network is composed of a plurality of U-shaped phase change heat pipes, the U-shaped phase change heat pipe adopts a nested structure, the U-shaped phase change heat pipe is sequentially provided with an inner pipe, a phase change layer and an outer pipe wall from inside to outside, the working medium in the inner pipe is hot water, the phase change layer is provided with foamed metal, and the foamed metal pores are filled with phase change materials.

[0008] Further, the plurality of U-shaped phase change heat pipes of the U-shaped phase change heat pipe network are all provided with water inlets and water outlets, the boiler intelligent heating module is respectively connected with a water outlet main pipe and a water inlet main pipe, the plurality of water inlets are connected with the water inlet main pipe, and the plurality of water outlets are connected with the water outlet main pipe.

[0009] Further, the water inlet end of the plurality of U-shaped phase change heat pipes is provided with a water inlet flow electric regulating valve, and the water inlet flow electric regulating valve is used for regulating the flow of each U-shaped phase change heat pipe.

[0010] Further, the dye-sensitized solar power generation device comprises a dye-sensitized solar cell panel, the dye-sensitized solar cell panel is arranged at the top of the dye-sensitized solar power generation device and covers the top surface and the side surface of the greenhouse body, and the dye-sensitized solar cell panel is in a transparent state.

[0011] Further, the U-shaped phase change heat pipe network adopts a modular design, and the parameters of the plurality of U-shaped phase change heat pipes can be individually started and stopped and precisely controlled.

[0012] Further, the material of the outer pipe wall of the U-shaped phase change heat pipe is graphene.

[0013] Advantages of the present application: 1. The renewable energy such as photovoltaic and wind power is integrated, the phase change energy storage and lithium battery energy storage are matched, a stable and efficient energy supply system is constructed, and the dependence on traditional energy is reduced.

[0014] 2. The phase change material characteristics are utilized to accurately control the greenhouse temperature, the energy supply and demand peak valley difference is relieved, and the stable growth environment of crops is ensured.

[0015] 3. The underground heat exchange technology is fused to strengthen energy recycling and improve the intelligent and fine level of greenhouse environment control. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the system of the present application; Figure 2 It is a schematic diagram of the cross-sectional structure of the U-shaped phase change heat pipe in the present application; Figure 3 It is a connection schematic diagram of the U-shaped phase change heat pipe network and the boiler intelligent heating module in the present application; In the figure: 1, greenhouse body; 2, dye-sensitized solar power generation device; 3, wind power generation device; 4, bidirectional DC / AC converter; 5, intelligent heating module of boiler; 6, lithium battery energy storage module; 7, intelligent soil insulation module; 7-1, U-shaped phase change heat exchanger pipe network; 7-1-1, inner pipe; 7-1-2, phase change layer; 7-1-3, outer pipe wall; 7-2, crop planting culture layer; 7-3, buffer layer; 7-4, foundation; 7-5, glass fiber cloth reinforcement layer; 7-6, anti-seepage insulation layer; 8, pipe network buckle; 9, foamed metal; 10, phase change material; 11, water outlet main pipe; 12, water inlet main pipe; 13, water inlet flow electric regulating valve. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative work under the premise that the scope of the present application is not exceeded. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0018] As Figure 1 shown, a multi-energy complementary greenhouse soil insulation system based on phase change energy storage, characterized by: including greenhouse body 1, dye-sensitized solar power generation device 2, wind power generation device 3, bidirectional DC / AC converter 4, intelligent heating module of boiler 5, lithium battery energy storage module 6 and intelligent soil insulation module 7.

[0019] The dye-sensitized solar power generation device 2 is fixedly installed at the top of the greenhouse body 1, the wind power generation device 3 is arranged at one side of the top of the greenhouse body 1, the bidirectional DC / AC converter 4 is arranged inside the greenhouse body 1, the boiler intelligent heating module 5 and the lithium battery energy storage module 6 are arranged outside the greenhouse body 1, the intelligent heat preservation soil module 7 is arranged inside the greenhouse body 1, the dye-sensitized solar power generation device 2, the wind power generation device 3 and the intelligent heat preservation soil module 7 are connected with the boiler intelligent heating module 5, the dye-sensitized solar power generation device 2 and the wind power generation device 3 generate electric energy for the boiler intelligent heating module 5, the lithium battery energy storage module 6 is connected with the dye-sensitized solar power generation device 2 and the wind power generation device 3 through the bidirectional DC / AC converter 4, when the wind and light power generation power is greater than the soil heat preservation load demand, the excess electric energy is transported to the lithium battery energy storage module 6 through the bidirectional DC / DC converter 4 for storage, and the electric quantity stored in the lithium battery energy storage module 6 is used for energy guarantee of the intelligent heat preservation soil module 7, so as to cope with the situation that solar energy or wind energy is insufficient. Through lithium battery energy storage, the problem of wind and light power generation surplus is effectively solved, and through long-time energy storage, peak clipping and valley filling are realized, so that the situation that electric energy is insufficient at night is avoided, thereby energy is maximizedly saved.

[0020] The intelligent heat preservation soil module 7 is sequentially divided into a crop planting and cultivation layer 7-2, a buffer layer 7-3, a U-shaped phase change heat exchange pipe network 7-1, a glass fiber cloth reinforcing layer 7-5, an anti-seepage heat preservation layer 7-6 and a foundation 7-4 from top to bottom, and the U-shaped phase change heat exchange pipe network 7-1 is fixed between the buffer layer 7-3 and the glass fiber cloth reinforcing layer 7-5 through a pipe network buckle 8.

[0021] Through wind energy and solar energy generation, the energy consumption of greenhouse operation and maintenance is greatly reduced, long-term energy supply is realized through the lithium battery energy storage module 6, and more uniform and warm soil heating can be realized through the U-shaped phase change heat exchange pipe network 7-1.

[0022] Through the boiler intelligent heating module 5, the electric energy generated by wind energy and solar energy is converted into the internal energy of water, and then the soil is heated. This mode is safe and efficient, and the excess hot water can also be used for agricultural area life hot water supply.

[0023] As a preferred embodiment of the present application, as shown in Figure 2 The U-shaped phase change heat exchange pipe network 7-1 is composed of a plurality of U-shaped phase change heat exchange pipes, the U-shaped phase change heat exchange pipe adopts a nested structure, the U-shaped phase change heat exchange pipe is sequentially provided with an inner pipe 7-1-1, a phase change layer 7-1-2 and an outer pipe wall 7-1-3 from inside to outside, the working medium in the inner pipe 7-1-1 is hot water, the phase change layer 7-1-2 is provided with foamed metal 9, and the foamed metal 9 is filled with phase change material 10 in the pores.

[0024] As a preferred embodiment of the present application, as shown in Figure 3 The U-shaped phase-change heat exchange pipe network 7-1 is provided with water inlet and outlet, the boiler intelligent heating module 5 is respectively connected with the water outlet main pipe 11 and the water inlet main pipe 12, the plurality of water inlets are connected with the water inlet main pipe 12, the plurality of water outlets are connected with the water outlet main pipe 11, and the boiler intelligent heating module 5 provides hot water for the U-shaped phase-change heat exchange pipe network 7-1.

[0025] As a preferred embodiment of the present application, the water inlet end of the plurality of U-shaped phase-change heat exchange pipes is provided with a water inlet flow electric regulating valve 13, and the water inlet flow electric regulating valve 13 is used for regulating the flow of each U-shaped phase-change heat exchange pipe.

[0026] Through the setting of the plurality of water inlet pipes and water outlet pipes sharing one main pipe, the unified distribution of water inlet and outlet is realized, and through each water inlet flow electric regulating valve 13, the accurate regulation and control of each U-shaped phase-change heat exchange pipe can be realized, which can be used for the unified management of different types of crop areas.

[0027] As a preferred embodiment of the present application, the dye-sensitized solar power generation device 2 comprises a dye-sensitized solar cell panel, the dye-sensitized solar cell panel is arranged at the top of the dye-sensitized solar power generation device 2 and covers the top surface and side surface of the greenhouse body 1, the dye-sensitized solar cell panel is in a transparent state, and the dye-sensitized solar power generation device 2 considers the energy generation and light transmission requirements. The transparent characteristic of the dye-sensitized solar cell panel does not hinder the irradiation of light, thereby maximizing the utilization of the light surface of the greenhouse and generating more electric energy.

[0028] As a preferred embodiment of the present application, the U-shaped phase-change heat exchange pipe network 7-1 adopts a modular design, and the parameters of the plurality of U-shaped phase-change heat exchange pipes can be individually started, stopped and accurately controlled. The modular design is beneficial to later maintenance and repair, reduces the construction difficulty of the system, can meet the cultivation requirements of different crops, and can conveniently cope with maintenance and dredging of individual U-shaped phase-change heat exchange pipes.

[0029] As a preferred embodiment of the present application, the material of the outer pipe wall 7-1-3 of the U-shaped phase-change heat exchange pipe adopts a material with excellent mechanical properties, corrosion resistance and good heat conduction performance, such as graphene. The use of high-performance materials improves the corrosion resistance and heat conduction performance of the pipeline, which can ensure the stable operation of the pipe network system.

[0030] The working process of the system of the present application is as follows: When the wind resource is sufficient, the wind power generation device 3 starts to work to continuously convert the wind energy into electric energy. When the solar energy resource is sufficient (such as during the day), the dye-sensitized solar power generation device 2 converts the solar energy into electric energy. The electric energy converted by the wind-solar energy conversion is preferentially supplied to the boiler intelligent heating module 5 through the bidirectional DC / AC converter 4, the boiler intelligent heating module 5 converts the electric energy into the internal energy of hot water, and the high-temperature hot water is injected into the U-shaped phase-change heat exchange pipe network 7-1, and the heat is continuously transferred to the crop planting and cultivation layer 7-2 through multiple heat transfers to realize the temperature regulation of the soil. The surplus electric energy is stored through the lithium battery energy storage module 6, and when the wind-solar converted electric energy is insufficient to support the soil temperature regulation requirement, the electric energy in the lithium battery energy storage module 6 is delivered to the boiler intelligent heating module 5.

[0031] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can still adjust the technical solutions described in the foregoing embodiments or make equivalent replacement for some technical features. Therefore, if these modifications and variations of the present application fall within the scope of the claims of the present application and equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A multi-energy complementary greenhouse soil insulation system based on phase change energy storage, characterized in that: It comprises a greenhouse body (1), a dye-sensitized solar power generation device (2), a wind power generation device (3), a bidirectional DC / AC converter (4), a boiler intelligent heating module (5), a lithium battery energy storage module (6) and an intelligent soil insulation module (7). The dye-sensitized solar power generation device (2) is fixedly installed on the top of the greenhouse body (1), the wind power generation device (3) is arranged on one side of the top of the greenhouse body (1), the bidirectional DC / AC converter (4) is arranged inside the greenhouse body (1), the boiler intelligent heating module (5) and the lithium battery energy storage module (6) are arranged outside the greenhouse body (1), the intelligent soil insulation module (7) is arranged inside the greenhouse body (1), the dye-sensitized solar power generation device (2), the wind power generation device (3) and the intelligent soil insulation module (7) are connected with the boiler intelligent heating module (5), and the lithium battery energy storage module (6) is connected with the dye-sensitized solar power generation device (2) and the wind power generation device (3) in parallel through the bidirectional DC / AC converter (4). The intelligent soil insulation module (7) is sequentially divided into a crop planting and cultivation layer (7-2), a buffer layer (7-3), a U-shaped phase change heat exchange pipe network (7-1), a glass fiber cloth reinforcing layer (7-5), an anti-seepage and insulation layer (7-6) and a foundation (7-4) from top to bottom.

2. The multi-energy complementary greenhouse soil insulation system based on phase change energy storage according to claim 1, wherein the U-shaped phase change heat exchange pipe network (7-1) is composed of a plurality of U-shaped phase change heat exchange pipes, the U-shaped phase change heat exchange pipes adopt a nested structure, and the U-shaped phase change heat exchange pipes are sequentially provided with an inner pipe (7-1-1), a phase change layer (7-1-2) and an outer pipe wall (7-1-3) from inside to outside, a working medium in the inner pipe (7-1-1) is hot water, the phase change layer (7-1-2) is provided with foamed metal (9), and the foamed metal (9) is filled with phase change material (10) in pores.

3. The multi-energy complementary greenhouse soil insulation system based on phase change energy storage according to claim 2, wherein the plurality of U-shaped phase change heat exchange pipes of the U-shaped phase change heat exchange pipe network (7-1) are provided with water inlets and water outlets, the boiler intelligent heating module (5) is respectively connected with a water outlet main pipe (11) and a water inlet main pipe (12), the plurality of water inlets are connected with the water inlet main pipe (12), and the plurality of water outlets are connected with the water outlet main pipe (11).

4. The multi-energy complementary greenhouse soil insulation system based on phase change energy storage according to claim 3, wherein the water inlet end of each U-shaped phase change heat exchange pipe is provided with a water flow electric regulating valve (13), and the water flow electric regulating valve (13) is used for regulating the flow of each U-shaped phase change heat exchange pipe.

5. The multi-energy complementary greenhouse soil insulation system based on phase change energy storage according to claim 4, wherein ​ ​ ​ The dye-sensitized solar power generation device (2) comprises a dye-sensitized solar panel arranged at the top of the dye-sensitized solar power generation device (2) and covering the top surface and the side surface of the greenhouse body (1), and the dye-sensitized solar panel is in a transparent state.

6. The phase change energy storage-based multi-energy complementary greenhouse soil heat preservation system according to claim 5, characterized in that: The U-shaped phase change heat exchange pipe network (7-1) adopts a modular design, and the parameters of a plurality of U-shaped phase change heat exchange pipes can be individually started, stopped and precisely controlled.

7. The phase change energy storage-based multi-energy complementary greenhouse soil heat preservation system according to claim 6, characterized in that: The material of the outer pipe wall (7-1-3) of the U-shaped phase change heat exchange pipe is graphene.

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