Day and night low energy consumption solar drying system

Abstract

The application relates to the technical field of solar drying, and provides a low-energy-consumption solar drying system for day and night, which comprises a CPV / T power generation device, a phase change energy storage box, a drying box, a first circulating loop and a second circulating loop; the first circulating loop comprises a first circulating pipeline, a first heat exchange fluid and a pump body; the first circulating pipeline passes through the CPV / T power generation device, the phase change energy storage box and the drying box; the first heat exchange fluid absorbs the heat energy of the CPV / T power generation device and returns to flow after sequentially transmitting the heat energy to the phase change energy storage box and the drying box; the CPV / T power generation device supplies power to the pump body; the phase change energy storage box is filled with a phase change substance; the second circulating loop comprises a second circulating pipeline and a second heat exchange fluid; and the second circulating pipeline passes through the phase change energy storage box and the drying box. The application realizes 24-hour continuous drying of crops, has wide application range and stable effect. The CPV / T power generation device is used to supply power to the pump body, so that the system energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of solar drying, and particularly relates to a day-and-night dual-purpose low-energy-consumption solar drying system. BACKGROUND

[0002] At present, the mainstream method for drying agricultural products can be roughly divided into four kinds: natural airing method, freeze-drying method, hot air drying method and solar drying method. Among them, the solar drying method has low energy consumption, significantly shortens the drying time, and the taste of the obtained agricultural products is relatively the best. The solar drying method adopts the principle of convective heat and mass transfer, and has stable drying effect and high reliability. However, the current solar drying method has the problem of high energy consumption, and due to the dependence on solar energy, the energy storage effect is poor, and it is impossible to realize continuous drying of agricultural products day and night, which affects the quality of agricultural products. SUMMARY

[0003] In view of the problems of the prior art, the application provides a day-and-night dual-purpose low-energy-consumption solar drying system, which stores heat energy by using a phase change energy storage device, realizes continuous drying day and night, and at the same time uses a solar power generation device to supply power to system electronic equipment, thereby reducing energy consumption.

[0004] The application provides a day-and-night dual-purpose low-energy-consumption solar drying system, which comprises a CPV / T power generation device, a phase change energy storage box, a drying box, a first circulation loop and a second circulation loop. The drying box is used for storing substances to be dried. The first circulation loop comprises a first circulation pipeline, a first heat exchange fluid arranged in the first circulation pipeline and a pump body for driving the first heat exchange fluid to circulate. The first circulation pipeline passes through the CPV / T power generation device, the phase change energy storage box and the drying box. The first heat exchange fluid flowing through the CPV / T power generation device absorbs heat energy of the CPV / T power generation device, and then sequentially transfers the absorbed heat energy to the phase change energy storage box and the drying box and returns to the CPV / T power generation device. The CPV / T power generation device comprises a CPV / T power generation plate, and the CPV / T power generation plate supplies power to the pump body. The phase change energy storage box is filled with a phase change substance. The phase change substance absorbs heat and stores energy. The second circulation loop comprises a second circulation pipeline and a second heat exchange fluid arranged in the second circulation pipeline. The second circulation pipeline passes through the phase change energy storage box and the drying box. The second heat exchange fluid flowing through the phase change energy storage box transfers the heat energy released by the phase change substance to the drying box.

[0005] The CPV / T power generation device further comprises a heat exchange pipeline, a Fresnel lens and a glass pipeline arranged below the Fresnel lens; a first circulating pipeline passing through the CPV / T power generation device is arranged in the glass pipeline; the CPV / T power generation panel is arranged below the glass pipeline; the heat exchange pipeline comprises a hot tube and a cold tube connected in communication and a third heat exchange fluid arranged in the hot tube and the cold tube; the hot tube is arranged below the CPV / T power generation panel and is used for absorbing the light energy refracted by the Fresnel lens to heat the third heat exchange fluid, and the cold tube is arranged in the glass pipeline and is used for releasing the heat energy transferred to the cold tube by the third heat exchange fluid.

[0006] The CPV / T power generation device further comprises a light guide cylinder; an upper end of the light guide cylinder is arranged with the Fresnel lens, and a lower end of the light guide cylinder is arranged with the hot tube; a light guide space is formed in the light guide cylinder, and the glass pipeline and the CPV / T power generation panel are arranged in the light guide space.

[0007] Further, the cold tube is arranged in the first circulating pipeline passing through the CPV / T power generation device.

[0008] Further, the first circulating pipeline comprises a first spiral pipeline arranged in the phase change energy storage tank; the second circulating pipeline comprises a second spiral pipeline arranged in the phase change energy storage tank; and the first spiral pipeline and the second spiral pipeline form a double spiral structure.

[0009] Further, the dry tank is arranged with a storage rack and an air guide assembly; the air guide assembly is used for guiding the airflow to flow through the storage rack and the first circulating pipeline and the second circulating pipeline passing through the dry tank.

[0010] Further, the air guide assembly comprises an air inlet and an air outlet arranged on the dry tank; the storage rack and the first circulating pipeline and the second circulating pipeline passing through the dry tank are arranged between the air inlet and the air outlet.

[0011] Further, the air guide assembly further comprises an air expansion pipe arranged in the inner side of the air inlet; the air expansion pipe is arranged with a fan.

[0012] Further, the dry tank and the phase change energy storage tank are arranged with a heat insulation layer outside.

[0013] Further, the first heat exchange fluid comprises a nanofluid.

[0014] The beneficial effects of this invention are as follows: The first heat exchange fluid in the first circulation loop flows through the CPV / T power generation device, the phase change energy storage tank, and the drying chamber. The heat energy absorbed by the first heat exchange fluid from the CPV / T power generation device is sequentially transferred to the phase change energy storage tank and the drying chamber, achieving the drying of the material inside the drying chamber. Simultaneously, the phase change energy storage tank absorbs and stores energy through the phase change material during the day, and releases heat through condensation at night. This released heat energy is transferred to the drying chamber through the second heat exchange fluid, achieving nighttime drying of the material inside the drying chamber. Combined with the CPV / T power generation device, this maintains a stable temperature in the drying chamber, enabling continuous 24-hour drying of materials, including crops. It has a wide range of applications and stable results. Utilizing the CPV / T power generation plate of the CPV / T power generation device to power the pump reduces system energy consumption. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the low-energy solar drying system of the present invention, which can be used day and night.

[0016] Figure 2 This is a schematic diagram of the CPV / T power generation device of the present invention.

[0017] Figure 3 for Figure 2 A side view structural diagram.

[0018] Figure 4 This is a cross-sectional structural schematic diagram of the phase change energy storage box of the present invention.

[0019] Figure 5 This is a schematic diagram of the structure of the drying oven of the present invention.

[0020] Figure 6 for Figure 5 A side view structural diagram.

[0021] In the diagram, 10-CPV / T power generation unit; 11-CPV / T power generation panel; 12-light guide tube; 13-heat exchange pipeline; 131-heat pipe; 132-cold pipe; 14-Fresnel lens; 15-glass pipe; 20-phase change energy storage box; 30-drying oven; 31-shelf; 32-air inlet; 33-air outlet; 40-first circulation loop; 41-first spiral pipe; 50-second circulation loop; 51-second spiral pipe. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1-6 The low-energy solar drying system shown includes: a CPV / T power generation device 10, a phase change energy storage box 20, a drying box 30, a first circulation loop 40, and a second circulation loop 50.

[0024] The drying box 30 is used for storing the material to be dried, and the material to be dried in the present application is taken as crops for example. The drying box 30 and the phase change energy storage box 20 are externally provided with a heat insulation layer.

[0025] The first circulation loop 40 comprises a first circulation pipeline, a first heat exchange fluid arranged in the first circulation pipeline, and a pump body for driving the first heat exchange fluid to circulate. The first circulation pipeline passes through the CPV / T power generation device 10, the phase change energy storage box 20 and the drying box 30. The first heat exchange fluid flowing through the CPV / T power generation device 10 absorbs the heat energy of the CPV / T power generation device 10, and then sequentially transfers the absorbed heat energy to the phase change energy storage box 20 and the drying box 30, and finally returns to the CPV / T power generation device 10. The first heat exchange fluid in the embodiment comprises a nanofluid. The first circulation pipeline provides a circulating space for the nanofluid, and the first circulation pipeline separates the nanofluid from the CPV / T power generation device 10, the phase change energy storage box 20 and the drying box 30. The nanofluid flows through the CPV / T power generation device 10, the phase change energy storage box 20 and the drying box 30, but does not enter the inside of them, and only performs temperature transfer.

[0026] As shown in Figure 2 , Figure 3 , the CPV / T power generation device 10 comprises a CPV / T power generation panel 11, a light guide cylinder 12, a heat exchange pipeline 13, a Fresnel lens 14 and a glass pipeline 15 arranged below the Fresnel lens 14.

[0027] The CPV / T power generation panel 11 supplies power to the pump body. The pump body is an electric pump or a hydraulic pump. When the pump body is a hydraulic pump, it further comprises a hydraulic system, and the CPV / T power generation panel 11 also supplies power to the hydraulic system. The CPV / T power generation panel 11 is a prior art, and its power generation principle is not specifically explained in the present embodiment.

[0028] The first circulation pipeline passing through the CPV / T power generation device 10 is located in the glass pipeline 15. The CPV / T power generation panel 11 is arranged below the glass pipeline 15. The heat exchange pipeline 13 comprises a hot pipe 131 and a cold pipe 132 connected in communication, and a third heat exchange fluid arranged in the cold pipe 132 and the hot pipe 131. The third heat exchange fluid in the present embodiment is preferably water. The hot pipe 131 is located below the CPV / T power generation panel 11, and is used for absorbing the light energy refracted by the Fresnel lens 14 to heat the third heat exchange fluid. The cold pipe 132 is located in the glass pipeline 15, and is used for releasing the heat energy transferred to it by the third heat exchange fluid. In order to improve the heat exchange efficiency, in the present embodiment, the cold pipe 132 is located in the first circulation pipeline passing through the CPV / T power generation device 10.

[0029] The upper end of the light guide cylinder 12 is provided with a Fresnel lens 14, and the lower end of the light guide cylinder 12 is provided with a heat pipe 131; the inside of the light guide cylinder 12 is formed with a light guide space, and the glass pipe 15 and the CPV / T power generation plate 11 are located in the light guide space.

[0030] The Fresnel lens 14 transmits sunlight to the heat pipe 131, and the heat pipe 131 heats the third heat exchange fluid in the inside after absorbing heat, and the third heat exchange fluid transmits heat energy to the cold pipe 132 in communication with the heat pipe 131 after being heated, wherein the connecting pipe of the cold pipe 132 in communication with the heat pipe 131 is located outside the light guide cylinder 12 to avoid affecting the light guide effect of the light guide cylinder 12. The cold pipe 132 can be understood as a condenser, and the heat energy of the third heat exchange fluid in the inside is transmitted to the surrounding, and since the cold pipe 132 is arranged in the first circulating pipe passing through the CPV / T power generation device 10, the nanofluid in the first circulating pipe passing through the CPV / T power generation device 10 is heated and heated by the heat energy released by the cold pipe 132, and then flows through the phase change energy storage tank 20 under the action of the pump body. The third heat exchange fluid in the inside of the cold pipe 132 flows back to the heat pipe 131 after releasing heat, so as to realize the conversion of solar energy into heat energy and transmission through the nanofluid. At the same time, solar energy is used for power generation to supply power for the pump body driving the nanofluid to circulate.

[0031] The phase change energy storage tank 20 is filled with phase change material; the phase change material absorbs heat and stores energy; in this embodiment, the phase change material takes paraffin as an example. The paraffin absorbs heat and stores energy in the process of melting from solid to liquid, and releases heat when solidifying from liquid to solid. When the nanofluid flows through the phase change energy storage tank 20, the paraffin is heated and melts to absorb heat. At night, the Fresnel lens 14 lacks sunlight, so that the heat pipe 131 of the heat exchange pipe 13 cannot absorb heat, so that no heat is transmitted to the paraffin, and the paraffin begins to release heat and solidify, and the released heat energy is transmitted to the drying tank 30 through the second circulating loop 50 to realize drying at night.

[0032] The second circulating loop 50 includes a second circulating pipe and a second heat exchange fluid arranged in the second circulating pipe; the second circulating pipe passes through the phase change energy storage tank 20 and the drying tank 30, and the second heat exchange fluid flowing through the phase change energy storage tank 20 transmits the heat energy released by the phase change material to the drying tank 30.

[0033] In this embodiment, the second heat exchange fluid and the third heat exchange fluid both adopt water.

[0034] As Figure 4As shown, the first circulating pipeline comprises a first spiral pipeline 41 arranged in the phase change energy storage tank 20; the second circulating pipeline comprises a second spiral pipeline 51 arranged in the phase change energy storage tank 20; the first spiral pipeline 41 and the second spiral pipeline 51 form a double spiral structure. The first spiral pipeline 41 and the second spiral pipeline 51 do not interfere with each other and are in a sealed state in the phase change energy storage tank 20, so that the paraffin cannot enter the first spiral pipeline 41 and the second spiral pipeline 51, and the first spiral pipeline 41 and the second spiral pipeline 51 only transfer heat energy in the phase change energy storage tank 20. The first spiral pipeline 41 and the second spiral pipeline 51 can be in contact with each other, heat exchange is realized, heat energy is provided mainly by the first circulating pipeline and second circulating pipeline during the day, heat energy is provided mainly by the second circulating pipeline and first circulating pipeline at night, so that the first circulating pipeline and the second circulating pipeline located in the drying tank 30 can emit heat, the heating area is expanded, and the drying effect is improved.

[0035] As shown in Figure 5 , Figure 6 , the drying tank 30 is provided with a shelf 31 and an air guide assembly; the air guide assembly is used to guide the airflow to flow through the shelf 31 and the first circulating pipeline and the second circulating pipeline passing through the drying tank 30. The air guide assembly comprises an air inlet 32, an air outlet 33 and an air expansion pipe arranged on the drying tank 30; the shelf 31 and the first circulating pipeline and the second circulating pipeline passing through the drying tank 30 are arranged between the air inlet 32 and the air outlet 33. The air expansion pipe is a horn pipe, the inlet port diameter of which is larger than the outlet port diameter, the air expansion pipe is installed on the air inlet 32, and a fan is installed on the inlet end of the air expansion pipe; when the fan operates, the air outside the drying tank 30 enters the inside of the drying tank 30 from the outlet end of the air expansion pipe after passing through the inlet end of the air expansion pipe. Of course, the air expansion pipe can also be installed in other ways, for example, the air expansion pipe has an inlet end and multiple outlet ends, the inlet end and the multiple outlet ends are respectively communicated, the fan is installed on the inlet end, and the outlet ends are located at the air inlets 32 of the drying tank 30. Correspondingly, the air inlets 32 of the drying tank 30 are provided with multiple air inlets 32, and the multiple outlet ends of the air expansion pipe are arranged one by one corresponding to the multiple air inlets 32 of the drying tank 30, so that the air can enter the inside of the drying tank 30 uniformly. The air entering the inside of the drying tank 30 is heated by the first circulating pipeline and the second circulating pipeline to form hot air, which dries the crops in the drying tank 30, and then is discharged from the air outlet 33.

[0036] The shelf 31 adopts a multi-layer structure, and the inner wall of the drying tank 30 is provided with a support limiting structure for supporting the shelf 31 and limiting the distance between the multi-layer shelves 31. In this embodiment, the shelf 31 adopts a wire mesh. The support limiting structure adopts a support plate, and the support plate is provided with horizontal limiting grooves, and the two ends of the wire mesh are arranged in the limiting grooves of the support plates of the two side walls of the drying tank 30.

[0037] In some embodiments, the shelf 31 comprises a drum, the side wall of the drum adopts a mesh structure, and the inside of the drum is provided with a material to be dried. Taking crops as beans as an example, the inner wall of the drum is provided with spiral ribs, the ribs can separate the crops, and guide the crops to spiral centrifugal movement to improve the drying effect. One end of the drum is provided with a cover plate, and the other end is connected with a driving motor. The driving motor drives the drum to rotate, so as to realize the rotary drying of the crops in the inside.

[0038] The above are only preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solutions falling within the concept of the present application shall be considered as falling within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the present application shall also be considered as falling within the protection scope of the present application.

Claims

1. A low energy consumption solar drying system for day and night use, characterized by, The application relates to a CPV / T power generation device, a phase change energy storage box, a drying box, a first circulation loop and a second circulation loop. The drying box is used for storing materials to be dried. The first circulation loop comprises a first circulation pipeline, a first heat exchange fluid arranged in the first circulation pipeline, and a pump body used for driving the first heat exchange fluid to circulate; the first circulation pipeline passes through the CPV / T power generation device, the phase change energy storage box and the drying box; the first heat exchange fluid flowing through the CPV / T power generation device absorbs the heat energy of the CPV / T power generation device, and then sequentially transfers the absorbed heat energy to the phase change energy storage box and the drying box and returns to the CPV / T power generation device. The CPV / T power generation device comprises a CPV / T power generation panel which supplies power to the pump body. The phase change energy storage box is filled with phase change materials; the phase change materials absorb heat and store energy. The second circulation loop comprises a second circulation pipeline and a second heat exchange fluid arranged in the second circulation pipeline; the second circulation pipeline passes through the phase change energy storage box and the drying box; the second heat exchange fluid flowing through the phase change energy storage box transfers the heat energy released by the phase change materials to the drying box. The CPV / T power generation device further comprises a heat exchange pipeline, a Fresnel lens and a glass pipeline arranged below the Fresnel lens; the first circulation pipeline passing through the CPV / T power generation device is arranged in the glass pipeline; the CPV / T power generation panel is arranged below the glass pipeline; the heat exchange pipeline comprises a hot pipe and a cold pipe connected in communication and a third heat exchange fluid arranged in the hot pipe and the cold pipe; the hot pipe is arranged below the CPV / T power generation panel and is used for absorbing the light energy refracted by the Fresnel lens to heat the third heat exchange fluid; the cold pipe is arranged in the glass pipeline and is used for releasing the heat energy transferred to the cold pipe by the third heat exchange fluid. The CPV / T power generation device further comprises a light guide cylinder; the Fresnel lens is arranged at the upper end of the light guide cylinder, and the hot pipe is arranged at the lower end of the light guide cylinder; a light guide space is formed in the light guide cylinder, and the glass pipeline and the CPV / T power generation panel are arranged in the light guide space. The cold pipe is arranged in the first circulation pipeline passing through the CPV / T power generation device.

2. The dual-purpose low energy consumption solar drying system of claim 1, wherein, The first circulation pipeline comprises a first spiral pipeline arranged in the phase change energy storage box; the second circulation pipeline comprises a second spiral pipeline arranged in the phase change energy storage box; and the first spiral pipeline and the second spiral pipeline form a double spiral structure.

3. The dual-purpose low energy consumption solar drying system of claim 1, wherein, The drying box is provided with a storage rack and an air guide assembly; the air guide assembly is used for guiding air flow to flow through the storage rack and pass through the first circulation pipeline and the second circulation pipeline of the drying box.

4. The dual-purpose low energy consumption solar drying system of claim 1, wherein, The air guide assembly comprises an air inlet and an air outlet arranged on the drying box; the storage rack and the first circulation pipeline and the second circulation pipeline passing through the drying box are arranged between the air inlet and the air outlet.

5. The dual-purpose low energy consumption solar drying system of claim 4, wherein, The air guide assembly further comprises an air expansion pipe arranged in the inner side of the air inlet; the air expansion pipe is provided with a fan.

6. The dual-purpose low energy consumption solar drying system of claim 5, wherein, ​ 7. The dual-purpose low energy consumption solar drying system of claim 1, wherein, The dry box and the phase change energy storage box are externally provided with heat insulation layers.

8. The dual-purpose low energy consumption solar drying system of claim 1, wherein, The first heat exchange fluid comprises a nanofluid.

Images