Solar hot air medium-high temperature solid heat storage drying system

Abstract

The utility model belongs to the technical field of heat storage drying, and particularly discloses a solar hot air medium-high temperature solid heat storage drying system which comprises a solar air heat collection module, a solid heat storage module, a power supply module and a temperature and humidity adjusting module. The solar air heat collection module utilizes solar energy to heat and generate hot air, the power supply module generates photovoltaic electricity through solar energy, the photovoltaic electricity can supply power to an electric heating element and convert the electric heating element into heat energy, the solid heat storage module stores the heat energy, and when no effective illumination exists, grid electricity or the off-peak electricity period of the grid electricity is utilized to supply power to the electric heating element for heat storage. The solid heat storage module can release heat energy in the whole process to heat cold air, continuous hot air generation is achieved, off-peak electricity is used for supplying power, the stability of a power grid is met, meanwhile, the production cost can be saved, and therefore solar energy is fully utilized, and the requirements for low-carbon operation and low-cost operation are met. The material dryer is suitable for drying materials.

Description

Technical Field

[0001] This utility model belongs to the field of heat storage and drying technology, specifically a high-temperature solid heat storage and drying system for solar hot air. Background Technology

[0002] Drying is a crucial technological step in industrial and agricultural production and has broad market prospects. Traditional drying methods typically involve heating fossil fuels such as coal and natural gas to generate steam, hot water, or directly producing hot air. These methods suffer from high energy consumption and severe pollution emissions.

[0003] Solar energy is one of the earliest renewable energy sources utilized by humankind, boasting advantages such as wide distribution, easy accessibility, renewability, and no environmental pollution. Currently, solar energy is commonly used in solar power generation and solar water heating, and the technology is relatively mature. Therefore, solar drying technology has attracted considerable attention from researchers. Although solar drying technology has many advantages, it cannot provide continuous energy for drying on cloudy days, at night, or rainy days due to insufficient sunlight. Utility Model Content

[0004] The purpose of this invention is to provide a high-temperature solid thermal storage drying system for solar hot air, which utilizes the effective radiation of solar energy to store the heat generated by solar energy, so as to achieve the purpose of drying the object to be dried at any time, saving energy and reducing pollution emissions.

[0005] To achieve the above objectives, the technical method adopted by this utility model is as follows:

[0006] A solar-powered hot air high-temperature solid-state thermal storage drying system includes a solar air collector module, a solid-state thermal storage module, and a drying heat-generating device. The solar air collector module includes an inlet manifold, an outlet manifold, multiple solar vacuum tubes, and multiple guide pipes. The inlet manifold has an air inlet at its starting end and a closed end at its ending end. The outlet manifold has a closed end corresponding to the starting end of the inlet manifold and an open end corresponding to the ending end of the inlet manifold, serving as an air outlet. One end of each solar vacuum tube is closed, and the other end is open and connected to the outlet manifold. The number of solar vacuum tubes and guide tubes is the same. Multiple solar vacuum tubes and matching guide tubes are arranged side by side between the air inlet manifold and the air outlet manifold. One end of the guide tube is connected to the air inlet manifold, and the other end of the guide tube extends to the closed end of the solar vacuum tube. The open end of the solar vacuum tube is connected to the air outlet manifold, forming a channel for airflow in the solar air collector module. The solid heat storage module is equipped with an air inlet connector and an air outlet connector. The air outlet of the air outlet manifold is connected to the air inlet connector of the solid heat storage module, and the air outlet connector of the solid heat storage module is connected to the drying heat device. As a limitation, it also includes a power supply module. The solid heat storage module includes a heat storage core, a shell, an air inlet connector, and an air outlet connector. The heat storage core is located inside the shell. The air inlet connector is installed at one end of the shell, and the air outlet connector is installed at the other end of the shell. The heat storage core includes multiple hot air heat storage units stacked in the height direction. An electric heat storage unit is arranged between adjacent hot air heat storage units. The hot air heat storage unit includes a first solid heat storage medium and a heat exchange pipe arranged in the first solid heat storage medium. The electric heat storage unit includes a second solid heat storage medium and a heating pipe arranged in the second solid heat storage medium. An electric heating element is installed in the heating pipe, and the electric heating element is electrically connected to the power supply module.

[0007] As a further limitation: both the upper and lower surfaces of the heat storage core are provided with insulation layers.

[0008] As a further definition: the power supply module includes a photovoltaic power source, mains power, and a power controller. The photovoltaic power source includes a photovoltaic panel and an inverter. The photovoltaic panel is electrically connected to the inverter. Both the inverter and the mains power are connected to an automatic switcher. The automatic switcher is used to automatically switch between the photovoltaic power source and the mains power to supply power to the heating elements of the solid thermal storage module.

[0009] As another limitation: the air inlet and outlet connectors of the solid heat storage module are both horn-shaped reducing interfaces. The large opening end of the air inlet connector of the solid heat storage module is connected to one end of the outer shell. An air distribution plate is provided inside the large opening end of the air inlet connector. The small opening end of the air inlet connector of the solid heat storage module is connected to the air outlet of the solar air collector module. The large opening end of the air outlet connector of the solid heat storage module is connected to the other end of the outer shell. The small opening end of the air outlet connector of the solid heat storage module is connected to the drying heat device.

[0010] As a further limitation, it also includes a temperature and humidity control module, which includes a temperature sensor, a humidity sensor, and a control pipeline. A first valve, a temperature sensor, and a humidity sensor are installed on the connecting pipeline between the air outlet of the solid heat storage module and the drying heat device. The temperature sensor and humidity sensor are located between the first valve and the air outlet of the solid heat storage module. A control pipeline for flowing normal temperature air is also connected to the connecting pipeline between the first valve and the air outlet of the solid heat storage module. A second valve is installed on the control pipeline.

[0011] As a further limitation: it also includes a heat recovery unit, a drying heat device connected to the heat recovery unit, the heat recovery unit being connected to both external air and a solar air collector module, the recovered heat energy being used to preheat the air and then transferring the preheated air to the solar air collector module, and the exhaust gas after heat recovery being discharged into the atmosphere.

[0012] The beneficial effects achieved by this utility model, due to the adoption of the above-mentioned solution, compared with the prior art, are as follows:

[0013] (1) The present invention provides a solar hot air high temperature solid thermal storage drying system, including a solar air heat collection module, a solid thermal storage module, a power supply module and a temperature and humidity regulation module. The power supply module and the solar air heat collection module can make full use of the effective sunshine time of the sun. The solar air heat collection module uses solar energy to heat and generate hot air. The photovoltaic panel of the power supply module generates photovoltaic electricity through solar energy. The hot air is transmitted to the solid thermal storage module. The solid thermal storage module can store thermal energy. The photovoltaic electricity can supply power to the electric heating element in the solid thermal storage module. When it is not within the effective sunshine time of the sun, the solid thermal storage module can release thermal energy to heat the cold air. During the off-peak electricity period, the off-peak electricity is used to supply power to the electric heating element in the solid thermal storage module, realizing continuous generation of hot air. In addition, the use of off-peak electricity can save production costs while meeting the grid stability requirements. Furthermore, it makes full use of solar energy to meet the requirements of low-carbon operation and low-cost operation.

[0014] (2) The solar hot air high temperature solid heat storage drying system provided by this utility model extends the guide pipe to the bottom of the solar vacuum tube, forming an annular guide heat absorption space in the solar vacuum tube, which strengthens the mass transfer process, overcomes the defects of large flow resistance and low mass and heat transfer performance of ordinary heat collection tubes, can make full use of solar radiation, quickly heat the air to produce hot air, and improve the efficiency of air heat exchange.

[0015] (3) The solar hot air high temperature solid thermal storage drying system provided by this utility model is equipped with a power supply module and an electric heating element in the solid thermal storage module. When the hot air generated by the solar air collector module does not reach the required drying temperature, it can heat the hot air to reach the required drying temperature. An insulation board layer is set to keep the heat out and prevent heat loss. By setting an air distribution plate on the inner side of the large opening end of the air inlet connector, the air volume entering the solid thermal storage module is uniform. A single hot air thermal storage unit and an electric thermal storage unit are set up, which is simple to assemble and convenient to transport, package and maintain. The power supply module can automatically switch between photovoltaic power supply and mains power supply, which reduces the overall energy consumption and operating cost of the system and improves the carbon reduction and carbon reduction capabilities of the system. By setting a temperature and humidity adjustment module, the temperature and humidity of the hot air entering the drying heat device can be adjusted. By setting a heat recovery device, energy can be comprehensively utilized, energy waste is avoided and the air heating rate is improved.

[0016] This invention is applicable to the drying of items. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of a high-temperature solid thermal storage drying system in a solar hot air system according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the solid heat storage core according to an embodiment of the present invention;

[0020] Figure 3 This is a structural block diagram of a high-temperature solid thermal storage drying system for solar hot air according to an embodiment of the present invention;

[0021] In the diagram: 1. Inlet manifold; 2. Inlet; 3. Outlet manifold; 4. Outlet; 5. Guide pipe; 6. Solar vacuum tube; 7. Inlet connector; 8. Outer shell; 9. Outlet connector; 10. First solid thermal storage medium; 11. Heat exchange pipe; 12. Second solid thermal storage medium; 13. Heating pipe; 14. Heating element; 15. Insulation board layer; 16. Adhesive layer; 17. Temperature sensor; 18. Humidity sensor; 19. Regulating pipe; 20. Second valve; 21. First valve; 22. Drying heat device; 23. Heat recovery unit. Detailed Implementation

[0022] The present invention will be further described below with reference to the embodiments. However, those skilled in the art should understand that the present invention is not limited to the following embodiments. Any improvements and equivalent changes made based on the specific embodiments of the present invention are within the scope of protection of the claims of the present invention.

[0023] Example 1: A high-temperature solid thermal storage drying system for solar hot air

[0024] A high-temperature solid thermal storage drying system for solar hot air, such as Figure 1 and Figure 3 As shown, the system includes a solar air collector module, a solid heat storage module, a power supply module, a drying heat device 22, a temperature and humidity control module, and a heat recovery unit 23. An induced draft fan can be installed in front of the solar air collector module. The solar air collector module is connected to the solid heat storage module, which is connected to the drying heat device 22. The drying heat device 22 is connected to the heat recovery unit 23. The heat recovery unit is connected to both external air and the solar air collector module, used to preheat the air and transfer the preheated air to the solar air collector module. The power supply module provides electrical energy to the solid heat storage module. The temperature and humidity control module is installed on the connecting pipe between the solid heat storage module and the drying heat device 22, used to regulate the temperature and humidity of the hot air entering the drying heat device 22.

[0025] The solar air collector module includes an air inlet manifold 1, an air outlet manifold 3, multiple solar vacuum tubes 6, and multiple guide pipes 5. The starting end of the air inlet manifold 1 is the air inlet 2, and the end of the air inlet manifold 1 is closed. The end of the air outlet manifold 3 corresponding to the starting end of the air inlet manifold 1 is closed, and the end of the air outlet manifold 3 corresponding to the end of the air inlet manifold 1 is open, which is the air outlet 4. One end of the solar vacuum tube 6 is closed, and the other end of the solar vacuum tube 6 is open and connected to the air outlet manifold 3. The number of solar vacuum tubes 6 and guide pipes 5 is the same. Multiple solar vacuum tubes 6 and matching guide pipes 5 are arranged side by side between the air inlet manifold 1 and the air outlet manifold 3. One end of the guide pipe 5 is connected to the air inlet manifold 1, and the other end of the guide pipe 5 extends to the closed end of the solar vacuum tube 6. The open end of the solar vacuum tube 6 is connected to the air outlet manifold 3, forming a channel for airflow in the solar air collector module. In this embodiment, the guide tube 5 is made of metal and extends to the closed end of the solar vacuum tube 6, forming an annular heat-absorbing space inside the solar vacuum tube 6. This enhances the mass transfer process, overcomes the defects of ordinary heat collection tubes such as high flow resistance and low mass and heat transfer performance, and can make full use of solar radiation to quickly heat the air and produce hot air, thus improving the efficiency of air heat exchange.

[0026] like Figure 2As shown, the solid-state thermal energy storage module includes a thermal energy storage core, an outer shell 8, an air inlet connector 7, and an air outlet connector 9. The thermal energy storage core is located inside the outer shell 8. Both the air inlet connector 7 and the air outlet connector 9 of the solid-state thermal energy storage module are flared variable diameter interfaces. The large opening end of the air inlet connector 7 is connected to one end of the outer shell 8, and an air distribution plate is provided inside the large opening end of the air inlet connector. The small opening end of the air inlet connector 7 is connected to the air outlet 4 of the solar air collector module. The large opening end of the air outlet connector 9 is connected to the other end of the outer shell 8, and the small opening end of the air outlet connector 9 is connected to the drying heat device 22. The thermal energy storage core includes... Multiple hot air heat storage units are stacked vertically. Electric heat storage units are positioned between adjacent hot air heat storage units. Adjacent electric heat storage units and hot air heat storage units are bonded together using a thermally conductive fine-particle concrete binder, forming an adhesive layer 16. Each hot air heat storage unit includes a first solid heat storage medium 10 and heat exchange pipes 11 arranged within the first solid heat storage medium 10. Each electric heat storage unit includes a second solid heat storage medium 12 and heating pipes 13 arranged within the second solid heat storage medium 12. Heating elements 14 are installed in the heating pipes 13. Insulation layers 15 are provided on both the upper and lower surfaces of the heat storage core. In this embodiment, the heating pipes 13 and heat exchange pipes 11 are made of metal to improve the system's thermal efficiency. In this embodiment, both the first solid heat storage medium 10 and the second solid heat storage medium 12 are regular structures formed by concrete pouring. The concrete is a thermally conductive concrete material, composed of a thermally conductive agent, cement, silica sand, gravel, and water. Thermally conductive concrete material has the characteristics of thermal stability, thermal conductivity, energy storage, and heat energy in the medium-high temperature range of 100-1000℃. Multiple heat storage cores can be configured in this embodiment. These multiple heat storage cores are arranged side-by-side or stacked vertically to form a regular shape. The heat exchange pipes 11 of the side-by-side heat storage cores are interconnected, and the connection points are sealed with high-temperature resistant sealing strips. Adjacent heat storage cores are bonded together using a thermally conductive fine-particle concrete adhesive. When the temperature of the first solid heat storage medium 10 and the second solid heat storage medium 12 of the previous stage heat storage core drops to a level where high-temperature air cannot be generated, they can continue to be used as preheaters for the next stage heat storage core, maximizing the utilization of stored energy and improving the efficiency of the entire system.

[0027] The power supply module includes a photovoltaic power source, mains power, and a power controller. The photovoltaic power source consists of photovoltaic panels and an inverter. The photovoltaic panels are electrically connected to the inverter, and both the inverter and the mains power are connected to an automatic switcher. The automatic switcher automatically switches between the photovoltaic power source and the mains power to supply power to the heating element 14 of the solid-state thermal storage module. During the effective solar radiation period, the photovoltaic panels generate electricity using solar energy. This electricity is then converted by the inverter to 220V-380V AC power. The heating element 14 then converts the electrical energy into heat energy, which is stored in the solid-state thermal storage module. Since the daily solar radiation period is limited, the module can fully utilize photovoltaic electricity to provide power to the heating element 14 during the day and utilize off-peak electricity at night to provide power to the heating element 14. This reduces the overall energy consumption and operating costs of the system and improves the system's carbon reduction capabilities.

[0028] The temperature and humidity control module includes a temperature sensor 17, a humidity sensor 18, and a control pipe 19. A first valve 21, a temperature sensor 17, and a humidity sensor 18 are installed on the connecting pipe between the solid heat storage module air outlet connector 9 and the drying heat device 22. The temperature sensor 17 and the humidity sensor 18 are located between the first valve 21 and the solid heat storage module air outlet connector 9. The connecting pipe between the first valve 21 and the solid heat storage module air outlet connector 9 is also connected to a control pipe 19 for the flow of normal temperature air. A second valve 20 is installed on the control pipe 19.

[0029] When drying feed using the solar hot air high-temperature solid thermal storage drying system of this embodiment, corn stalks are chopped, crushed, and evenly fed into a rotary drum dryer. An induced draft fan is installed before the air inlet 2 of the solar air collector module to guide air into the module. The air flows through the solar air collector module's inlet manifold 1 and guide pipe 5 into the solar vacuum tube 6, and then out to the outlet manifold 3. During this airflow, the air is heated by solar radiation in the guide pipe 5 and the solar vacuum tube 6, producing hot air that flows through the outlet manifold 3 and the solid thermal storage module's inlet connector 7 to the heat exchange pipes 11 and 13 of the thermal storage core. This hot air exchanges heat with the first solid thermal storage medium 10 and the second solid thermal storage medium 12, storing the heat in both. When drying is required, the heat is drawn from the solid thermal storage module... Hot air is discharged. When the temperature of the hot air does not reach the temperature required for drying, the power supply module provides power to the heating element 14 to heat the first solid heat storage medium 10, the second solid heat storage medium 12, and the air, and keeps them warm. The power supply module can automatically switch between photovoltaic power supply and mains power as needed. If the temperature of the hot air discharged from the solid heat storage module is too high, it can be adjusted through the regulating pipe 19 of the temperature and humidity regulating module. The second valve 20 is opened to introduce room temperature air to cool the hot air until it meets the temperature required for drying. In this embodiment, the hot air temperature is adjusted to 60℃-90℃, the first valve 21 is opened, and the hot air flows into the dryer to dry the feed for 4-5 minutes. The dried feed flows out from the dryer outlet to the radiator and recovers heat energy through the heat recovery device 23. The moisture content is reduced to below 10%, the outlet temperature is reduced to 15℃, and it is packaged for use.

Claims

1. A high-temperature solid thermal storage and drying system for solar hot air, characterized in that, The system includes a solar air collector module, a solid-state thermal storage module, and a drying heat device. The solar air collector module comprises an inlet manifold, an outlet manifold, multiple solar vacuum tubes, and multiple guide pipes. The inlet manifold has an air inlet at one end and a closed end at the other. The outlet manifold has a closed end corresponding to the inlet manifold's opening and an open end corresponding to the inlet manifold's closing end. One end of each solar vacuum tube is closed, and the other end is open and connected to the outlet manifold. The solar vacuum tubes and guide pipes... The same number of solar vacuum tubes and matching guide pipes are arranged side by side between the air inlet manifold and the air outlet manifold. One end of the guide pipe is connected to the air inlet manifold, and the other end of the guide pipe extends to the closed end of the solar vacuum tube. The open end of the solar vacuum tube is connected to the air outlet manifold, forming a channel for air fluid in the solar air collector module. The solid heat storage module is equipped with an air inlet connector and an air outlet connector. The air outlet of the air outlet manifold is connected to the air inlet connector of the solid heat storage module, and the air outlet connector of the solid heat storage module is connected to the drying heat device.

2. The high-temperature solid thermal storage and drying system for solar hot air according to claim 1, characterized in that, It also includes a power supply module. The solid heat storage module includes a heat storage core, a shell, an air inlet connector, and an air outlet connector. The heat storage core is located inside the shell. The air inlet connector is installed at one end of the shell, and the air outlet connector is installed at the other end of the shell. The heat storage core includes multiple hot air heat storage units stacked in the height direction. An electric heat storage unit is arranged between adjacent hot air heat storage units. The hot air heat storage unit includes a first solid heat storage medium and a heat exchange pipe arranged in the first solid heat storage medium. The electric heat storage unit includes a second solid heat storage medium and a heating pipe arranged in the second solid heat storage medium. An electric heating element is installed in the heating pipe, and the electric heating element is electrically connected to the power supply module.

3. The high-temperature solid thermal storage and drying system for solar hot air according to claim 2, characterized in that, Both the upper and lower surfaces of the heat storage core are equipped with insulation layers.

4. A high-temperature solid thermal storage and drying system for solar hot air according to claim 3, characterized in that, The power supply module includes a photovoltaic power source, mains power, and a power controller. The photovoltaic power source includes a photovoltaic panel and an inverter. The photovoltaic panel is electrically connected to the inverter. Both the inverter and the mains power are connected to an automatic switcher. The automatic switcher is used to automatically switch between the photovoltaic power source and the mains power to supply power to the heating elements of the solid thermal storage module.

5. A high-temperature solid thermal storage and drying system for solar hot air according to claim 2, characterized in that, Both the air inlet and outlet connectors of the solid heat storage module are horn-shaped reducing interfaces. The large opening end of the air inlet connector of the solid heat storage module is connected to one end of the outer shell. An air distribution plate is provided inside the large opening end of the air inlet connector. The small opening end of the air inlet connector of the solid heat storage module is connected to the air outlet of the solar air collector module. The large opening end of the air outlet connector of the solid heat storage module is connected to the other end of the outer shell. The small opening end of the air outlet connector of the solid heat storage module is connected to the drying heat device.

6. A high-temperature solid thermal storage and drying system for solar hot air according to any one of claims 1-5, characterized in that, It also includes a temperature and humidity control module, which includes a temperature sensor, a humidity sensor, and a control pipeline. A first valve, a temperature sensor, and a humidity sensor are installed on the connecting pipeline between the air outlet of the solid heat storage module and the drying heat device. The temperature sensor and humidity sensor are located between the first valve and the air outlet of the solid heat storage module. A control pipeline for flowing normal temperature air is also connected to the connecting pipeline between the first valve and the air outlet of the solid heat storage module. A second valve is installed on the control pipeline.

7. A high-temperature solid thermal storage and drying system for solar hot air according to claim 5, characterized in that, It also includes a heat recovery unit, a drying heat device connected to the heat recovery unit, and the heat recovery unit connected to the external air and the solar air collector module. The recovered heat energy is used to preheat the air and transfer the preheated air to the solar air collector module. The exhaust gas after recovering heat energy is discharged into the atmosphere.

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