Solar tube liner spiral heating structure and system

Abstract

The invention discloses a solar pipe inner container spiral heating structure and system.The solar pipe inner container spiral heating structure comprises a plurality of inner container pipes and a spiral heat conduction pipe, the inner container pipes are arranged on a support at intervals and form a modularized inner container array, and the upper end and the lower end of each inner container pipe are provided with sealing rings; a spiral heat conduction pipe is arranged on the inner side of each inner container pipe, each spiral heat conduction pipe is of a spiral structure formed by winding an aluminum pipe or a copper pipe through pipe winding equipment, and the spiral diameter of each spiral heat conduction pipe is matched with the inner diameter of the corresponding inner container pipe; the outer surface of the liner pipe is coated with a nano ceramic coating, and the spiral heat conduction pipe is filled with a heat conduction working medium which is heat conduction oil. Through integrated innovation of a spiral heating structure and a system, high efficiency, compactness and intelligence of solar energy utilization are realized, and the system cost and energy consumption are remarkably reduced while the heating speed and the conversion efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the field of solar heat collection, and in particular to a solar tube inner liner spiral heating structure and system. Background Art

[0002] Solar tubes are core components that utilize the principle of solar thermal collection to convert sunlight into heat. They are widely used in solar water heating systems, heating systems, and industrial heat recovery. Their basic structure typically consists of a vacuum glass tube or metal liner. An absorbent coating efficiently captures solar radiation and transfers heat to a flowing heat transfer medium (such as thermal oil or water), ultimately storing or utilizing the thermal energy.

[0003] Although traditional solar tubes have been widely used in the field of photothermal conversion, their technical bottlenecks are becoming increasingly prominent, especially in the following aspects that restrict their efficiency and promotion and application:

[0004] The heat transfer medium in traditional solar tubes flows in a straight line, and the heating distance is limited by the tube length, resulting in a slow temperature rise. To meet the heat load, it is necessary to increase the number of tube branches (such as connecting multiple collector tubes in parallel) or extend the pipe length to increase the total heat output. However, this significantly increases the system footprint, installation costs, and the load-bearing capacity of the roof, making it particularly unsuitable for urban high-rise buildings, older residential buildings, or other space-constrained environments.

[0005] The photothermal conversion efficiency of traditional solar tubes is generally less than 75%, and their performance drops sharply under conditions such as rainy days, low light or winter. They need to rely on auxiliary heating equipment (such as electric heating rods and gas boilers) to maintain heating, resulting in increased system energy consumption and operating costs, which goes against the low-carbon original intention of solar energy utilization.

[0006] To compensate for the insufficient efficiency of a single pipe, traditional systems often adopt a multi-stage series or parallel design, which requires complex pipeline connections, circulation pump control, and valve adjustment, increasing the risk of system failure and maintenance difficulty.

[0007] To solve the above problems, the industry has tried the following technical paths:

[0008] Optimize the coating and materials of the solar collector tubes: Use a selective absorption coating with high absorptivity and low emissivity, or replace aluminum tubes with copper tubes with better thermal conductivity. Although this improves the photothermal conversion efficiency, it cannot change the physical limitation of the short heating stroke in a single tube, and still relies on increasing the number of tubes to increase the total heat.

[0009] Increasing pipe diameter or flow rate: Increasing heat exchange by enlarging the pipe diameter or increasing the flow rate of the heat transfer medium will increase the system pressure and energy consumption, and it is easy to cause pipeline corrosion, leakage and water hammer effect, and reduce stability and safety.

[0010] Series multi-stage collectors: Connecting multiple collectors in series can extend the heating process, but it requires complex piping layout and pump control, which significantly increases system cost and maintenance difficulty, especially in household heating scenarios where the economy is poor. Summary of the Invention

[0011] The purpose of the present invention is to provide a spiral heating structure and system for the inner liner of a solar tube. Through the innovation of the spiral heating structure and system integration, the efficient, compact and intelligent utilization of solar energy is achieved, while the heating speed and conversion efficiency are improved, and the system cost and energy consumption are significantly reduced.

[0012] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a solar tube inner liner spiral heating structure, comprising an inner liner tube and a spiral heat conducting tube, wherein: a plurality of inner liner tubes are provided and are arranged at intervals on a bracket to form a modular inner liner array, sealing rings are provided at the upper and lower ends of each inner liner tube, and a spiral heat conducting tube is provided on the inner side of each inner liner tube. The spiral heat conducting tube is an aluminum tube or a copper tube wound into a spiral structure by a tube winding device, and the spiral diameter of the spiral heat conducting tube is adapted to the inner diameter of the inner liner tube.

[0013] Preferably, the outer surface of the inner bile duct is sprayed with a nano-ceramic coating. The nano-ceramic coating uses nano-scale particle composite technology to form a dense porous microstructure, which can efficiently capture visible light and near-infrared light in the solar spectrum (absorption rate ≥ 95%), while suppressing thermal radiation loss (emissivity ≤ 5%). Compared with traditional selective absorption coatings, the photothermal conversion efficiency is improved by 5%-8%, especially under high temperature conditions (≥ 150°C), it can still maintain high efficiency. In addition, the nano-ceramic coating has excellent thermal stability (temperature resistance ≥ 400°C) and can withstand high temperature environments for a long time without oxidation, decomposition or performance degradation; its dense structure can effectively block ultraviolet rays and water vapor erosion, and prevent the coating from aging and peeling; at the same time, the coating has high tolerance to chemicals such as acids, alkalis, and salt spray, and is suitable for harsh environments such as coastal areas and industrial pollution.

[0014] Preferably, the spiral heat pipe is filled with a heat transfer medium, preferably thermal oil. Thermal oil (such as mineral oil, synthetic oil, or silicone oil) has a high boiling point and flash point, allowing it to remain liquid at high temperatures, preventing vaporization-induced pressure surges and system failure. Compared to water or ethylene glycol, thermal oil is more suitable for high-temperature solar thermal systems.

[0015] The present invention also provides a solar tube liner spiral heating system, comprising the above-mentioned solar tube liner spiral heating structure and a circulating pump body, a heat exchange device, a phase change energy storage component and a cogeneration component, wherein: one end of the circulating pump body is connected to the heat transfer oil output side of the modular liner array through a main oil pipe, and the other end of the circulating pump body is connected to the heat exchange device; the heat exchange device is a plate heat exchanger, the primary side inlet of the plate heat exchanger is connected to the output side of the circulating pump body, the primary side outlet of the plate heat exchanger is connected to the heat transfer oil input side of the modular liner array through a return oil pipe, and the secondary side inlet and outlet of the plate heat exchanger are respectively connected to the cold water pipe and the hot water pipe.

[0016] Preferably, the phase-change energy storage assembly is connected in parallel to the end of the main oil pipe. It includes an array of interconnected phase-change energy storage tanks, a waste heat inlet pipe, and a waste heat outlet pipe. The phase-change energy storage tanks comprise a stainless steel tank body, a paraffin wax-expanded graphite composite PCM encapsulated within the stainless steel tank body, and a spiral coil heat exchanger positioned within the stainless steel tank body. Paraffin wax has a high latent heat of phase change but poor thermal conductivity. By combining it with expanded graphite to form a three-dimensional thermal network, the thermal conductivity of the composite PCM is increased to 5-10 W / m·K, boosting energy storage efficiency by 3-5 times.

[0017] Preferably, the heat transfer oil inlet and outlet sides of the stainless steel tank are respectively connected to the waste heat inlet pipe and the waste heat outlet pipe, and valves are installed on the waste heat inlet pipe and the waste heat outlet pipe, and the ends of the waste heat inlet pipe and the waste heat outlet pipe are connected to the main oil pipe. The phase change energy storage component can store excess solar thermal energy during the day and release it at night or on rainy days to ensure the continuity of heating. It is particularly suitable for scenarios such as industrial continuous production and regional heating. The phase change energy storage component is connected to the end of the main oil pipe in parallel. The number of energy storage tanks can be increased or decreased according to actual needs, and the energy storage capacity can be flexibly adjusted to adapt to solar energy systems of different sizes (such as homes and industrial parks). The parallel structure enables each energy storage tank to work independently, and the failure of a single tank does not affect the operation of other tanks, thereby improving system reliability; at the same time, the charging and discharging status of each tank can be controlled by valves to achieve on-demand energy storage and release.

[0018] Preferably, the combined heat and power generation assembly includes a photovoltaic panel, a heat conductive layer and a heat transfer tube, wherein the photovoltaic panel is arranged in an array on one side of the heat exchange device, and the back side of the photovoltaic panel is covered with the heat conductive layer.

[0019] Preferably, the photovoltaic panel array is arranged on one side of the heat exchange device, and its back side is covered with a graphene copper foil composite heat conductive layer, which can simultaneously achieve:

[0020] Power generation function: Photovoltaic panels convert solar energy into electrical energy (photovoltaic conversion efficiency ≥ 22%);

[0021] Waste heat recovery: The thermal conductive layer quickly absorbs the temperature of the photovoltaic panel backplane (usually 60-80°C), reducing the panel operating temperature and improving power generation efficiency (for every 1°C reduction in temperature, the efficiency increases by approximately 0.4%-0.5%).

[0022] Preferably, the heat transfer pipe is a pipe structure with a heat transfer channel arranged inside. The front end of the heat transfer pipe is connected to the heat transfer layer, and the end of the heat transfer pipe is provided with a heat transfer pipe sleeve, which is arranged on the return oil pipe at the primary side outlet of the plate heat exchanger.

[0023] Preferably, the heat conduction channel is filled with a circulating heat-conducting medium, and the circulating heat-conducting medium is an oily medium or a nanofluid.

[0024] Preferably, the thermally conductive layer is a graphene copper foil composite thermally conductive plate. Waste heat from the photovoltaic backsheet is transferred through the thermally conductive layer to the heat transfer tube, heating the circulating thermal fluid inside. The heated circulating thermal fluid effectively preheats the thermal oil before returning to the modular liner array.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention achieves efficient, compact, and intelligent solar energy utilization through a spiral heating structure and system integration innovation, significantly reducing system costs and energy consumption while improving heating speed and conversion efficiency. Specific beneficial effects include the following:

[0027] 1. This invention utilizes a spiral heat pipe design to extend the heating path of the heat transfer medium within a single pipe, enhancing the turbulent flow effect. This allows the heat transfer medium to absorb more heat within the same timeframe, increasing the heating rate by 2-4 times compared to traditional single-pipe structures, allowing the target temperature to be reached more quickly. This improved single-pipe heating efficiency significantly reduces the number of solar tubes required for the same heat load, lowering material costs, installation complexity, and roof load-bearing pressure. This makes it particularly suitable for buildings with limited space or load-bearing capacity.

[0028] 2. By optimizing the spiral flow channel and the inner tube coating, the present invention increases the light-to-heat conversion efficiency to over 90%, which is significantly higher than traditional solar tubes, and can maintain efficient operation especially in low light or winter conditions.

[0029] 3. The phase-change energy storage tank of this invention absorbs and stores waste heat through a paraffin-expanded graphite composite PCM (phase change material), releasing heat at night or during periods of low light, ensuring continuous heating and reducing reliance on auxiliary energy sources. The spiral structure enhances heat exchange and utilizes waste heat from the phase-change energy storage component, enabling the system to maintain efficient operation even on rainy days, in winter, or in low-light areas, broadening the application scenarios of solar energy technology.

[0030] 4. The photovoltaic panels and thermal conductive layer included in the system of the present invention work together to convert solar energy into electricity and heat energy simultaneously. The heat transfer tube recovers the heat energy of the photovoltaic backplane to the thermal oil circulation system, preheating the return oil pipe so that the thermal oil is efficiently preheated before returning to the modular inner tank array, realizing heat energy recovery. After preheating by the heat transfer tube, the initial temperature of the thermal oil is increased by 15°C-30°C, directly reducing the heating time and energy consumption of the solar tube inner tank, and significantly improving the overall energy efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic structural diagram of Example 1 of the present invention;

[0032] Figure 2 This is a schematic structural diagram of Example 2 of the present invention;

[0033] Figure 3 This is a schematic structural diagram of Example 3 of the present invention;

[0034] Figure 4 This is a structural diagram of Example 4 of the present invention.

[0035] In the figure: 1. Inner tube; 2. Spiral heat conduction tube; 3. Circulating pump body; 4. Heat exchange equipment; 5. Main oil pipe; 6. Return oil pipe; 7. Phase change energy storage component; 701. Phase change energy storage tank; 702. Waste heat inlet pipe; 703. Waste heat outlet pipe; 8. Combined heat and power generation component; 801. Photovoltaic panel; 802. Heat conduction tube. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] Example 1: Please refer to Figure 1 The present invention provides a technical solution: a solar tube inner liner spiral heating structure, including an inner liner tube 1 and a spiral heat conducting tube 2.

[0040] In this embodiment, a plurality of inner bile tubes 1 are provided and arranged at intervals on a bracket to form a modular inner bile array. Sealing rings are provided at the upper and lower ends of each inner bile tube 1, and a spiral heat conducting tube 2 is provided on the inner side of each inner bile tube 1. The spiral heat conducting tube 2 is an aluminum tube or a copper tube wound into a spiral structure by a tube winding device, and the spiral diameter of the spiral heat conducting tube 2 is adapted to the inner diameter of the inner bile tube 1.

[0041] In this embodiment, the outer surface of the inner bile duct 1 is sprayed with a nano-ceramic coating. The nano-ceramic coating adopts nano-scale particle composite technology to form a dense porous microstructure, which can efficiently capture visible light and near-infrared light in the solar spectrum (absorption rate ≥ 95%), while suppressing thermal radiation loss (emissivity ≤ 5%). Compared with traditional selective absorption coatings, the photothermal conversion efficiency is improved by 5%-8%, especially under high temperature conditions (≥ 150°C), it can still maintain high efficiency. The nano-ceramic coating has excellent thermal stability (temperature resistance ≥ 400°C) and can withstand high temperature environments for a long time without oxidation, decomposition or performance degradation; its dense structure can effectively block ultraviolet rays and water vapor erosion, and prevent the coating from aging and peeling; at the same time, the coating has high tolerance to chemicals such as acids, alkalis, and salt spray, and is suitable for harsh environments such as coastal areas and industrial pollution.

[0042] In this embodiment, the spiral heat pipe 2 is filled with a heat-conducting medium, which is thermal oil. Thermal oil (such as mineral oil, synthetic oil, or silicone oil) has high boiling and flash points and can remain liquid in high-temperature environments, avoiding sudden pressure increases or system failures caused by vaporization.

[0043] Example 1 provides a solar tube inner liner spiral heating structure, including a modular inner liner array and a spiral heat pipe 2. Through the coordinated design of nano-ceramic coating and thermal oil working fluid, it achieves efficient light-heat conversion, stable heat conduction and adaptability to high-temperature environments, and is suitable for solar high-temperature thermal collection systems.

[0044] Example 2: Please refer to Figure 2The present invention provides a technical solution: a solar tube liner spiral heating system, comprising the solar tube liner spiral heating structure of embodiment 1, a circulation pump body 3, and a heat exchange device 4, wherein: one end of the circulation pump body 3 is connected to the heat transfer oil output side of the modular liner array through a main oil pipe 5, and the other end of the circulation pump body 3 is connected to the heat exchange device 4; the heat exchange device 4 is a plate heat exchanger, the primary side inlet of the plate heat exchanger is connected to the output side of the circulation pump body 3, the primary side outlet of the plate heat exchanger is connected to the heat transfer oil input side of the modular liner array through a return oil pipe 6, and the secondary side inlet and outlet of the plate heat exchanger are respectively connected to the cold water pipe and the hot water pipe.

[0045] Example 2 provides a solar tube liner spiral heating system. Based on the solar tube liner spiral heating structure of Example 1, the circulation pump body 3 and the plate heat exchanger are integrated to form a closed-loop heat transfer oil circulation system, realizing efficient coordination of solar energy collection-heat energy transfer-terminal heat use, and is suitable for industrial heating, district heating, domestic hot water and other scenarios.

[0046] Example 3: Please refer to Figure 3 The present invention provides a technical solution: a solar tube liner spiral heating system, comprising the solar tube liner spiral heating structure of Example 1, the circulating pump body 3 of Example 2, a heat exchange device 4, and a phase-change energy storage assembly 7. The phase-change energy storage assembly 7 is connected in parallel to the end of the main oil pipe 5 and includes an array of interconnected phase-change energy storage tanks 701, a waste heat inlet pipe 702, and a waste heat outlet pipe 703. The phase-change energy storage tank 701 comprises a stainless steel tank body, a paraffin wax-expanded graphite composite PCM encapsulated within the stainless steel tank body, and a spiral coil heat exchanger disposed within the stainless steel tank body. Paraffin wax has high phase change latent heat but poor thermal conductivity. By combining it with expanded graphite to form a three-dimensional thermal conductive network, the thermal conductivity of the composite PCM is increased to 5-10 W / m·K, improving energy storage efficiency by 3-5 times.

[0047] In this embodiment, the heat transfer oil inlet and outlet sides of the stainless steel tank are respectively connected to the waste heat inlet pipe 702 and the waste heat outlet pipe 703, and valves are installed on the waste heat inlet pipe 702 and the waste heat outlet pipe 703. The ends of the waste heat inlet pipe 702 and the waste heat outlet pipe 703 are connected to the main oil pipe 5. The phase change energy storage component 7 can store excess solar thermal energy during the day and release it at night or on rainy days to ensure the continuity of heating. It is particularly suitable for scenarios such as industrial continuous production and regional heating. The phase change energy storage component 7 is connected to the end of the main oil pipe 5 in parallel. The number of energy storage tanks can be increased or decreased according to actual needs (such as 1-10), and the energy storage capacity can be flexibly adjusted to adapt to solar energy systems of different sizes (such as homes and industrial parks). The parallel structure enables each energy storage tank to work independently, and the failure of a single tank does not affect the operation of other tanks, thereby improving system reliability. At the same time, the charging and discharging status of each tank can be controlled by valves to achieve on-demand energy storage and release.

[0048] Example 3 provides a solar tube liner spiral heating system. Based on Example 1 (spiral heating structure) and Example 2 (circulation pump body 3 + heat exchange equipment 4), a new phase change energy storage component 7 is added. By connecting in parallel to the end of the main oil pipe 5, the storage and on-demand release of solar thermal energy are realized, solving the intermittent problem of solar energy and ensuring the continuity of heating. It is particularly suitable for scenarios such as industrial continuous production and regional heating.

[0049] Example 4: Please refer to Figure 4 The present invention provides a technical solution: a solar tube liner spiral heating system, comprising the solar tube liner spiral heating structure of Example 1, the circulation pump body 3 of Example 2, the heat exchange device 4, the phase change energy storage component 7 of Example 3, and the cogeneration component 8, the cogeneration component 8 comprising a photovoltaic panel 801, a heat conductive layer and a heat conduction pipe 802, wherein the photovoltaic panel 801 is arranged in an array on one side of the heat exchange device 4, and the back side of the photovoltaic panel 801 is covered with the heat conductive layer.

[0050] In this embodiment, the photovoltaic panel 801 array is arranged on one side of the heat exchange device 4, and its back side is covered with a graphene copper foil composite heat conductive layer, which can simultaneously achieve:

[0051] Power generation function: Photovoltaic panel 801 converts solar energy into electrical energy (photovoltaic conversion efficiency ≥ 22%);

[0052] Waste heat recovery: The heat conductive layer quickly absorbs the temperature of the photovoltaic panel 801 backplane (usually 60-80°C), reduces the panel operating temperature, and improves power generation efficiency (for every 1°C reduction in temperature, the efficiency increases by approximately 0.4%-0.5%).

[0053] In this embodiment, heat transfer tube 802 is a pipe structure with an internal heat transfer channel. The front end of heat transfer tube 802 is connected to the heat conductive layer, and the end of heat transfer tube 802 is provided with a heat conductive sleeve. This heat conductive sleeve is installed on the oil return pipe 6 at the primary outlet of the plate heat exchanger. The heat transfer channel is filled with a circulating heat conductive medium, which can be an oil-based medium or a nanofluid. The heat conductive layer is a graphene copper foil composite heat conductive plate. Waste heat from the photovoltaic backsheet is transferred to heat transfer tube 802 through the heat conductive layer, heating the circulating heat conductive medium within. The heated circulating heat conductive medium effectively preheats the thermal oil before returning to the modular liner array.

[0054] Example 4 provides a solar tube liner spiral heating system. Building on the features of Example 1 (spiral heating structure), Example 2 (circulating pump 3 + heat exchanger 4), and Example 3 (phase change energy storage assembly 7), this system adds a combined heat and power generation assembly 8. Through the collaborative design of photovoltaic panel 801 power generation and waste heat recovery, it achieves the dual benefits of power output and thermal energy utilization, while also improving overall system efficiency. This system is suitable for scenarios such as industrial heating, district heating, and distributed energy stations, and is particularly well-suited for users with high requirements for comprehensive energy utilization.

[0055] It is worth noting that the entire heating structure and system are controlled by the overall control system. Since the equipment matched with the control system is commonly used equipment and belongs to existing mature technology, its electrical connection relationship and specific circuit structure will not be described in detail here.

[0056] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present invention. Any changes, modifications, replacements and variations of the above embodiments by ordinary technicians in this field within the scope of the present invention should be included in the scope of protection of the present invention.

Claims

1. A solar tube inner liner spiral heating structure, characterized in that: The invention comprises an inner bile tube (1) and a spiral heat conducting tube (2), wherein: a plurality of inner bile tubes (1) are provided and arranged at intervals on a bracket to form a modular inner bile array; sealing rings are provided at the upper and lower ends of each inner bile tube (1); a spiral heat conducting tube (2) is provided on the inner side of each inner bile tube (1); the spiral heat conducting tube (2) is an aluminum tube or a copper tube wound into a spiral structure by a tube winding device; and the spiral diameter of the spiral heat conducting tube (2) is adapted to the inner diameter of the inner bile tube (1).

2. The solar tube inner liner spiral heating structure according to claim 1, characterized in that: The outer surface of the inner bile tube (1) is sprayed with a nano-ceramic coating.

3. The solar tube inner liner spiral heating structure according to claim 1, characterized in that: The spiral heat conducting pipe (2) is filled with a heat conducting medium, which is heat conducting oil.

4. A solar tube liner spiral heating system, comprising the solar tube liner spiral heating structure according to any one of claims 1 to 3, a circulating pump body (3), a heat exchange device (4), a phase change energy storage component (7) and a cogeneration component (8), wherein: One end of the circulation pump body (3) is connected to the heat transfer oil output side of the modular inner tank array through a main oil pipe (5), and the other end of the circulation pump body (3) is connected to a heat exchange device (4); the heat exchange device (4) is a plate heat exchanger, the primary side inlet of the plate heat exchanger is connected to the output side of the circulation pump body (3), the primary side outlet of the plate heat exchanger is connected to the heat transfer oil input side of the modular inner tank array through an oil return pipe (6), and the secondary side inlet and outlet of the plate heat exchanger are respectively connected to a cold water pipe and a hot water pipe.

5. The solar tube inner liner spiral heating system according to claim 4, characterized in that: The phase change energy storage assembly (7) is connected in parallel to the end of the main oil pipe (5), and the phase change energy storage assembly (7) comprises a phase change energy storage tank (701) distributed in an array and connected to each other, a waste heat inlet pipe (702) and a waste heat outlet pipe (703), wherein the phase change energy storage tank (701) comprises a stainless steel tank body, a paraffin-expanded graphite composite PCM encapsulated in the stainless steel tank body, and a spiral coil heat exchanger arranged in the stainless steel tank body.

6. The solar tube inner liner spiral heating system according to claim 5, characterized in that: The heat transfer oil inlet and outlet sides of the stainless steel tank are respectively connected to the waste heat inlet pipe (702) and the waste heat outlet pipe (703), valves are installed on the waste heat inlet pipe (702) and the waste heat outlet pipe (703), and the ends of the waste heat inlet pipe (702) and the waste heat outlet pipe (703) are connected to the main oil pipe (5).

7. The solar tube inner liner spiral heating system according to claim 4, characterized in that: The cogeneration component (8) includes a photovoltaic panel (801), a heat-conducting layer and a heat-conducting tube (802), wherein the photovoltaic panel (801) is arranged in an array on one side of the heat exchange device (4), and the back side of the photovoltaic panel (801) is covered with the heat-conducting layer.

8. The solar tube inner liner spiral heating system according to claim 7, characterized in that: The heat transfer pipe (802) is a pipe structure with a heat transfer channel arranged inside. The front end of the heat transfer pipe (802) is connected to the heat transfer layer, and the end of the heat transfer pipe (802) is provided with a heat transfer pipe sleeve, which is arranged on the return oil pipe (6) at the primary side outlet of the plate heat exchanger.

9. The solar tube inner liner spiral heating system according to claim 8, characterized in that: The heat conduction channel is filled with a circulating heat-conducting medium, which is an oily medium or a nanofluid.

10. The solar tube inner liner spiral heating system according to claim 7, characterized in that: The heat conducting layer is a graphene copper foil composite heat conducting plate.

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