Heat storage type heat supply device based on photovoltaic power generation

Abstract

The utility model provides a heat storage type heat supply device based on photovoltaic power generation. The heat storage type heat supply device comprises a photovoltaic power generation module, an energy storage module and a heat utilization terminal. The energy storage module comprises a heat storage device and a heat exchange device, a high-temperature fused salt storage tank and a low-temperature fused salt storage tank are arranged in the heat storage device, and the low-temperature fused salt storage tank is connected with the high-temperature fused salt storage tank through a conveying pipeline; the heat exchange device is circularly connected with the heat storage device and the heat utilization terminal through a heat exchange pipe network and a heat supply pipe network respectively; the photovoltaic power generation module is connected with the heat exchange device and the heat storage device through a main cable network and an auxiliary cable network. The water heater is reasonable in design, can stably provide heat energy for users, is low in heat loss, and has higher economic benefits and environmental benefits.

Description

Technical Field

[0001] This utility model belongs to the field of heating technology and relates to a heat storage heating device based on photovoltaic power generation. Background Technology

[0002] Solar energy, as one of the most widely used clean energy sources, can be converted into thermal energy, electrical energy, chemical energy, mechanical energy, or biological energy for utilization. It is characterized by its ubiquity and unlimited potential. Utilizing solar energy to provide electricity, heat, and warmth for human production and daily life has become an important way to supplement conventional energy sources.

[0003] CN202328492U discloses a solar self-circulating heating system, which includes a solar collector, an insulated water tank, heat sinks, flow valves, a heat transfer medium, a heating circulation pump, and a temperature sensor. It can be used and operated normally under various terrain and temperature conditions, and has high reliability, high heat collection efficiency, low failure rate, durability, and is easy to use and maintain.

[0004] CN206386995U discloses a photovoltaic-thermal integrated solar heating device, which includes an insulated water tank for water storage. The insulated water tank is also connected to two heating pipes. One heating pipe is composed of several solar collectors, and the other heating pipe is composed of an electric boiler. It combines the two methods of direct solar heating and electric heating to provide heat to the outside continuously.

[0005] However, due to limitations such as geographical location and climate change, solar radiation is unstable, significantly impacting the conversion of solar energy and the normal operation of heating systems. This is particularly true in regions with harsh climates and long winters, where daily heating needs are difficult to meet. To ensure continuous energy supply, inter-seasonal solar energy storage is necessary to release and utilize energy when sunlight is insufficient. Traditional energy storage methods include mechanical, electrochemical, electromagnetic, and thermochemical storage. However, due to limitations in location, environment, and storage technology, existing methods suffer from complex structures, large footprints, low storage temperatures, high storage difficulty, high losses, poor stability, and high operating costs, and may even pollute the environment. Therefore, providing a heating system with a reasonable structure and high operational stability is of great significance. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a solar energy storage heating device based on photovoltaic power generation, which converts solar energy into electrical energy to supply heat to users and stores excess energy in molten salt material, thus solving the problem of seasonal imbalance of solar energy heating and ensuring efficient and stable heating at night or in extreme weather.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] This utility model provides a photovoltaic power generation-based thermal storage heating device, including a photovoltaic power generation module, an energy storage module, and a heat-using terminal. The energy storage module includes a thermal storage device and a heat exchange device. The thermal storage device is equipped with a high-temperature molten salt storage tank and a low-temperature molten salt storage tank. The low-temperature molten salt storage tank is connected to the high-temperature molten salt storage tank through a conveying pipeline. The heat exchange device is circulated between the thermal storage device and the heat-using terminal through a heat exchange pipeline network and a heating pipeline network, respectively. The photovoltaic power generation module is connected to the heat exchange device and the thermal storage device through a main cable network and an auxiliary cable network, respectively.

[0009] This invention combines photovoltaic power generation with molten salt thermal storage to supply heat to users. It features high operational safety, large energy storage capacity and long storage period, improving the stability and reliability of heating supply, meeting daily needs, and low heat loss. It effectively reduces the cost of solar thermal storage across seasons and reduces environmental pollution.

[0010] As a preferred embodiment of this utility model, the photovoltaic power generation module includes a solar cell array, a DC controller, an inverter, and an energy storage component; the solar cell array is connected to the DC controller and the energy storage component respectively; the inverter is connected to the DC controller, the heat storage device, and the heat exchange device respectively through the main cable network; the energy storage component is connected to the heat storage device and the heat exchange device respectively through the auxiliary cable network.

[0011] As a preferred embodiment of this utility model, the heat exchange device is provided with a first electric heating component; the heat storage device is provided with a second electric heating component, the second electric heating component is connected to the low-temperature molten salt storage tank, and is used to heat the low-temperature molten salt storage tank; the inverter is connected to the first electric heating component and the second electric heating component respectively through the main cable network, and the energy storage component is connected to the first electric heating component and the second electric heating component respectively through the auxiliary cable network.

[0012] As a preferred embodiment of the present invention, the second electric heating component includes an electric heating layer disposed on the outer peripheral wall of the low-temperature molten salt storage tank.

[0013] As a preferred embodiment of this utility model, the main cable network includes a first power supply cable and a second power supply cable, and the auxiliary cable network includes a first branch cable and a second branch cable; the two ends of the first power supply cable are respectively connected to the inverter and the first electric heating component; the two ends of the second power supply cable are respectively connected to the inverter and the second electric heating component; the two ends of the first branch cable are respectively connected to the energy storage component and the first electric heating component; and the two ends of the second branch cable are respectively connected to the energy storage component and the second electric heating component.

[0014] As a preferred embodiment of this utility model, the heat exchange device includes a buffer container, in which a heating medium and a heating coil are disposed; the heat exchange pipeline includes a first heat exchange pipe and a second heat exchange pipe, the two ends of the first heat exchange pipe are respectively connected to the high-temperature molten salt storage tank and the inlet of the heating coil, and the two ends of the second heat exchange pipe are respectively connected to the low-temperature molten salt storage tank and the outlet of the heating coil; a first solenoid valve and a second solenoid valve are respectively disposed on the first heat exchange pipe and the second heat exchange pipe.

[0015] As a preferred embodiment of this utility model, the heating network includes a supply pipe and a return pipe; the two ends of the supply pipe are respectively connected to the outlet end of the buffer container and the inlet end of the heat-using terminal, and a drive pump is installed on the supply pipe; the two ends of the return pipe are respectively connected to the inlet end of the buffer container and the outlet end of the heat-using terminal, and an electric regulating valve is installed on the return pipe.

[0016] As a preferred embodiment of this utility model, the high-temperature molten salt storage tank is further provided with a number of electric heating rods, which are electrically connected to the energy storage component.

[0017] This invention utilizes an electric heating rod to ensure that the high-temperature molten salt material in the high-temperature molten salt storage tank always maintains the required temperature, reducing heat loss caused by temperature changes and improving the quality of high-temperature thermal energy.

[0018] As a preferred embodiment of this utility model, a first temperature sensor and a second temperature sensor are respectively installed in the high-temperature molten salt storage tank and the low-temperature molten salt storage tank; the first temperature sensor, the second temperature sensor, the first pressure sensor, and the second pressure sensor are independently electrically connected to the inverter.

[0019] As a preferred embodiment of this utility model, the high-temperature molten salt storage tank and the low-temperature molten salt storage tank are respectively equipped with a first pressure sensor and a second pressure sensor; the first pressure sensor and the second pressure sensor are independently electrically connected to the inverter.

[0020] As a preferred embodiment of this utility model, the outer walls of the high-temperature molten salt storage tank and the low-temperature molten salt storage tank are independently provided with an external insulation layer.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] This utility model provides a photovoltaic power generation-based thermal storage heating device that combines solar thermoelectric conversion and molten salt energy storage technology. It has a large energy storage capacity, high safety, and can continuously and stably output high-quality heat energy to users to meet their heat needs. It also reduces heat loss, lowers the cost of solar energy storage across seasons, and is environmentally friendly. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a photovoltaic power generation-based thermal storage heating device provided as a specific embodiment of the present invention.

[0024] Among them, 1-photovoltaic power generation module; 10-solar cell array; 11-DC controller; 12-inverter; 121-first power supply cable; 122-second power supply cable; 13-energy storage component; 131-first branch cable; 132-second branch cable; 14-first electric heating component; 15-second electric heating component; 151-electric heating layer; 16-electric heating rod; 2-energy storage module; 21-thermal storage device; 211-high temperature molten salt storage tank; 212-low temperature molten salt storage tank; 213-transfer pipe 214-Outer insulation layer; 215-First temperature sensor; 216-First pressure sensor; 217-Second temperature sensor; 218-Second pressure sensor; 22-Heat exchange device; 221-Buffer container; 222-Heating coil; 223-First heat exchange pipe; 2231-First solenoid valve; 224-Second heat exchange pipe; 2241-Second solenoid valve; 225-Supply pipe; 2251-Drive pump; 226-Return pipe; 2261-Electric regulating valve; 3-Heat terminal. Detailed Implementation

[0025] It should be understood that in the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] In one specific embodiment, this utility model provides a photovoltaic power generation-based thermal storage heating device, including a photovoltaic power generation module 1, an energy storage module 2, and a heat-using terminal 3. For example... Figure 1 As shown, the energy storage module 2 includes a heat storage device 21 and a heat exchange device 22. The photovoltaic power generation module 1 is connected to the heat exchange device 22 and the heat storage device 21 through a main cable network and an auxiliary cable network, respectively. When there is sufficient sunlight, the photovoltaic power generation module 1 converts solar energy into electrical energy to supply heat to the heating terminal 3 and stores excess energy in the energy storage module 2. During nights with poor sunlight, cloudy days, rainy days, or extreme winter weather, the heat stored in the energy storage module 2 is used to continuously supply heat to the heating terminal 3, ensuring the stability of the heating operation. The heat exchange device 22 is circulated between the heat storage device 21 and the heating terminal 3 through a heat exchange pipe network and a heating pipe network, so that the heat energy in the heat storage device 21 is transferred to the heating terminal 3 through the heat exchange device 22. The heat storage device 21 is equipped with a high-temperature molten salt storage tank 211 and a low-temperature molten salt storage tank 212. The low-temperature molten salt storage tank 212 is connected to the high-temperature molten salt storage tank 211 through a conveying pipe 213. The low-temperature molten salt in the low-temperature molten salt storage tank 212 is heated to a high-temperature molten salt temperature, and then fed into the high-temperature molten salt storage tank 211 through the conveying pipe 213 for heat energy storage.

[0029] This invention uses molten salt as the heat storage material, which has the advantages of high heat capacity and a wide liquid phase operating temperature range. Commonly used molten salts or combinations thereof can be selected. The high-temperature molten salt in the high-temperature molten salt storage tank 211 transfers heat to the heat exchange device 22, causing the high-temperature molten salt to cool down and transform into low-temperature molten salt without solidifying. The low-temperature molten salt then flows back to the low-temperature molten salt storage tank 212 for further heating, and then enters the high-temperature molten salt storage tank 211 through the conveying pipe 213 to store heat energy, thus completing the cycle. The conveying pipe 213 of this invention is also equipped with necessary conventional valves and general-purpose pumps. Those skilled in the art can add their own layout based on the process flow and equipment structure selection; this invention does not impose special requirements or specific limitations in this regard.

[0030] The outer shells of the high-temperature molten salt storage tank 211 and the low-temperature molten salt storage tank 212 can be made of steel plates, and an external insulation layer 214 is independently provided on the outer wall to reduce heat loss. The material of the external insulation layer 214 can be needle-punched cotton or rock wool, which are well known to those skilled in the art. The high-temperature molten salt storage tank 211 is equipped with a first temperature sensor 215 and a first pressure sensor 216 for real-time monitoring of the temperature and pressure of the high-temperature molten salt; the low-temperature molten salt storage tank 212 is equipped with a second temperature sensor 217 and a second pressure sensor 218 for real-time monitoring of the temperature and pressure of the low-temperature molten salt to prevent the molten salt from solidifying. The first temperature sensor 215, the second temperature sensor 217, the first pressure sensor 216, and the second pressure sensor 218 are all powered by the photovoltaic power generation module 1.

[0031] In some embodiments, the heat exchange device 22 includes a buffer container 221 filled with a heating medium and also equipped with a heating coil 222 to achieve heat exchange between the heating medium and the high-temperature molten salt, and to transfer the heat to the heat-using terminal 3 through the heating medium. Specifically, the heat exchange network includes a first heat exchange pipe 223 and a second heat exchange pipe 224. The two ends of the first heat exchange pipe 223 are respectively connected to the high-temperature molten salt storage tank 211 and the inlet of the heating coil 222, and the two ends of the second heat exchange pipe 224 are respectively connected to the low-temperature molten salt storage tank 212 and the outlet of the heating coil 222. During application, the high-temperature molten salt in the high-temperature molten salt storage tank 211 enters the heating coil 222 through the first heat exchange pipe 223 and exchanges heat with the heating medium in the buffer container 221, transferring heat to the heating medium and causing it to heat up. Meanwhile, the high-temperature molten salt transforms into low-temperature molten salt without solidifying. The low-temperature molten salt then enters the low-temperature molten salt storage tank 212 through the second heat exchange pipe 224 for heating, and subsequently flows into the high-temperature molten salt storage tank 211 for storage. The heating medium can be water or heat transfer oil, commonly used in the art.

[0032] Furthermore, a first solenoid valve 2231 and a second solenoid valve 2241 are respectively installed on the first heat exchange pipe 223 and the second heat exchange pipe 224 to adjust the flow rate of the molten salt. In addition, necessary conventional valves and general-purpose pumps are also installed on the first heat exchange pipe 223 and the second heat exchange pipe 224. Those skilled in the art can add their own layouts based on the process flow and equipment structure selection; this utility model does not impose any special requirements or specific limitations in this regard.

[0033] In addition, the buffer container 221 is also provided with necessary connecting pipes and switch control valves. This utility model does not make any special limitations on these. Those skilled in the art should reasonably adjust, add or delete them according to actual production needs. It should be noted that new technical solutions generated by deleting some unnecessary connecting pipes and switch control valves, or replacing single-function switch control valves with multi-function integrated control valves, or using external automatic control systems electrically connected to the switch control valves to control the opening of the corresponding valves, etc., which are common and well-known technical means by those skilled in the art, also fall within the scope of disclosure and protection of this utility model.

[0034] In some embodiments, the heating network includes a supply pipe 225 and a return pipe 226; the two ends of the supply pipe 225 are respectively connected to the outlet end of the buffer container 221 and the inlet end of the heat-using terminal 3, and a drive pump 2251 is installed on the supply pipe 225; the two ends of the return pipe 226 are respectively connected to the inlet end of the buffer container 221 and the outlet end of the heat-using terminal 3, and an electric regulating valve 2261 is installed on the return pipe 226 to realize the circulation of the heating medium between the buffer container 221 and the heat-using terminal 3, and transfer heat to the heat-using terminal 3 to meet the heating demand.

[0035] In one embodiment, the photovoltaic power generation module 1 includes a solar cell array 10, a DC controller 11, an inverter 12, and an energy storage assembly 13. The solar cell array 10 is connected to the DC controller 11 and the energy storage assembly 13. The inverter 12 is connected to the DC controller 11, the heat storage device 21, and the heat exchange device 22 via the main cable network. The energy storage assembly 13 is connected to the heat storage device 21 and the heat exchange device 22 via the auxiliary cable network. The energy storage assembly 13 uses multiple battery packs. The solar cell array 10 receives solar radiation and converts it into electrical energy, which is then input to the inverter 12 via the DC controller 11. The inverter 12 supplies power to the heat storage device 21 and / or the heat exchange device 22. Excess electrical energy generated by the solar cell array 10 is stored in the energy storage assembly 13 to supply power to the heat storage device 21 and / or the heat exchange device 22 when the inverter 12 fails or loses power.

[0036] The heat exchange device 22 is equipped with a first electric heating component 14 for heating the heating medium in the buffer container 221. The heat storage device 21 is equipped with a second electric heating component 15, which is connected to the cryogenic molten salt storage tank 212 for heating the cryogenic molten salt in the tank 212. The inverter 12 is connected to the first electric heating component 14 and the second electric heating component 15 via the main cable network for supplying power to the first electric heating component 14 and the second electric heating component 15. The energy storage component 13 is connected to the first electric heating component 14 and the second electric heating component 15 via the auxiliary cable network for supplying power to the first electric heating component 14 and the second electric heating component 15 when the inverter 12 malfunctions or loses power.

[0037] Specifically, the main cable network includes a first power supply cable 121 and a second power supply cable 122. The two ends of the first power supply cable 121 are connected to the inverter 12 and the first electric heating component 14, respectively. The two ends of the second power supply cable 122 are connected to the inverter 12 and the second electric heating component 15, respectively. The auxiliary cable network includes a first branch cable 131 and a second branch cable 132. The two ends of the first branch cable 131 are connected to the energy storage component 13 and the first electric heating component 14, respectively. The two ends of the second branch cable 132 are connected to the energy storage component 13 and the second electric heating component 15, respectively. Additionally, the main cable network also includes auxiliary cables. The inverter 12 is connected to the first temperature sensor 215, the second temperature sensor 217, the first pressure sensor 216, and the second pressure sensor 218 via these auxiliary cables, providing power for the operation of these sensors.

[0038] Furthermore, the second electric heating component 15 includes an electric heating layer 151 disposed on the outer peripheral wall of the low-temperature molten salt storage tank 212, thereby achieving uniform heating of the low-temperature molten salt and improving thermal efficiency.

[0039] Furthermore, the high-temperature molten salt storage tank 211 is also equipped with several electric heating rods 16, which are electrically connected to the energy storage component 13 to prevent the high-temperature molten salt from solidifying under extreme conditions.

[0040] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A photovoltaic power generation-based thermal storage heating device, characterized in that, The aforementioned thermal storage heating device includes a photovoltaic power generation module, an energy storage module, and a heat consumption terminal; The energy storage module includes a heat storage device and a heat exchange device. The heat storage device is equipped with a high-temperature molten salt storage tank and a low-temperature molten salt storage tank. The low-temperature molten salt storage tank is connected to the high-temperature molten salt storage tank through a conveying pipeline. The heat exchange device is circulated between the heat storage device and the heat-using terminal through a heat exchange pipeline network and a heating pipeline network, respectively. The photovoltaic power generation module is connected to the heat exchange device and the heat storage device through a main cable network and an auxiliary cable network, respectively.

2. The photovoltaic power generation-based thermal storage heating device according to claim 1, characterized in that, The photovoltaic power generation module includes a solar cell array, a DC controller, an inverter, and an energy storage component. The solar cell array is connected to the DC controller and the energy storage assembly respectively. The inverter is connected to the DC controller, the heat storage device and the heat exchange device respectively through the main cable network. The energy storage assembly is connected to the heat storage device and the heat exchange device respectively through the auxiliary cable network.

3. The photovoltaic power generation-based thermal storage heating device according to claim 2, characterized in that, The heat exchange device is equipped with a first electric heating component; The heat storage device is equipped with a second electric heating component, which is connected to the low-temperature molten salt storage tank and used to heat the low-temperature molten salt storage tank. The inverter is connected to the first electric heating component and the second electric heating component respectively through the main cable network, and the energy storage component is connected to the first electric heating component and the second electric heating component respectively through the auxiliary cable network.

4. The photovoltaic power generation-based thermal storage heating device according to claim 3, characterized in that, The second electric heating component includes an electric heating layer disposed on the outer peripheral wall of the low-temperature molten salt storage tank.

5. The photovoltaic power generation-based thermal storage heating device according to claim 3 or 4, characterized in that, The main cable network includes a first power supply cable and a second power supply cable, and the auxiliary cable network includes a first branch cable and a second branch cable; The two ends of the first power supply cable are respectively connected to the inverter and the first electric heating component; The two ends of the second power supply cable are respectively connected to the inverter and the second electric heating component; The two ends of the first branch cable are respectively connected to the energy storage component and the first electric heating component; The two ends of the second branch cable are respectively connected to the energy storage component and the second electric heating component.

6. The photovoltaic power generation-based thermal storage heating device according to claim 1, characterized in that, The heat exchange device includes a buffer container, and the buffer container is provided with a heating medium and a heating coil. The heat exchange pipeline network includes a first heat exchange pipeline and a second heat exchange pipeline. The two ends of the first heat exchange pipeline are respectively connected to the inlet of the high-temperature molten salt storage tank and the heating coil, and the two ends of the second heat exchange pipeline are respectively connected to the outlet of the low-temperature molten salt storage tank and the heating coil. A first solenoid valve and a second solenoid valve are respectively installed on the first heat exchange pipe and the second heat exchange pipe.

7. The photovoltaic power generation-based thermal storage heating device according to claim 6, characterized in that, The heating network includes supply pipelines and return pipelines; The two ends of the supply pipeline are respectively connected to the outlet end of the buffer container and the inlet end of the heat-using terminal, and a drive pump is installed on the supply pipeline. The return pipe is connected at both ends to the inlet of the buffer container and the outlet of the heat-using terminal, and an electric regulating valve is installed on the return pipe.

8. The photovoltaic power generation-based thermal storage heating device according to claim 2, characterized in that, The high-temperature molten salt storage tank is also equipped with several electric heating rods, which are electrically connected to the energy storage component.

9. The photovoltaic power generation-based thermal storage heating device according to claim 2, characterized in that, The high-temperature molten salt storage tank and the low-temperature molten salt storage tank are respectively equipped with a first temperature sensor and a second temperature sensor. The high-temperature molten salt storage tank and the low-temperature molten salt storage tank are respectively equipped with a first pressure sensor and a second pressure sensor. The first temperature sensor, the second temperature sensor, the first pressure sensor, and the second pressure sensor are independently electrically connected to the inverter.

10. The photovoltaic power generation-based thermal storage heating device according to claim 1, characterized in that, The high-temperature molten salt storage tank and the low-temperature molten salt storage tank are each provided with an external insulation layer on their outer walls.

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