Non-contact integrated device for molten salt heat storage and heat release with multiple heat sources and method of use

Abstract

The application discloses a non-contact molten salt heat storage and release integrated device with multiple heat sources and a use method, belongs to the field of molten salt heat storage technology, and comprises a heat exchange container, an automatic stirring structure driven by heat energy and a heat exchange pipeline, the heat exchange container is filled with a heat conducting medium and molten salt, and a temperature insulation plate divides the heat conducting medium and the molten salt into a first heat exchange area and a second heat exchange area; the automatic stirring structure is divided into two groups and is respectively arranged on the upper and lower plate surfaces of the temperature insulation plate, so as to respectively stir the molten salt in the first heat exchange area and the second heat exchange area; the heat exchange pipeline is embedded in the heat conducting medium and is arranged around the molten salt, and the two ends of the heat exchange pipeline are synchronously connected to supply waste heat of the molten salt heat storage or to supply heat of the molten salt heat release equipment. By using the device and the method, the heat energy of the heat conducting medium is converted into kinetic energy of the automatic stirring structure, real-time stirring without external power is realized, and the system heat exchange coefficient and the operation reliability are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of molten salt thermal energy storage technology, and in particular to an integrated device and method for non-contact multi-heat source molten salt thermal energy storage and release. Background Technology

[0002] Molten salt thermal energy storage, as a new type of energy storage, has advantages such as high conversion efficiency, high energy density, and low operating costs. It has become the mainstream due to its high energy density and wide temperature range. Traditional dual-tank or inclined temperature layer systems rely on molten salt pump circulation, which is expensive and prone to leakage. In recent years, the focus has shifted to "non-contact" systems, which fix molten salt in a porous substrate or container and use buried pipes as heat transfer medium for indirect heat exchange to eliminate corrosion, blockage, and heat tracing energy consumption.

[0003] Although the "non-contact" method avoids corrosion, the molten salt is enclosed in a static cavity, and heat is indirectly transferred through buried pipes and heat transfer medium. There are no mechanical pumps or impellers in the system, and it relies entirely on natural convection. This static approach is prone to causing local temperature differences during the heat storage process, forming a thick sloping temperature layer, which leads to a significant decrease in effective heat storage density, power decay in the later stages of heat release, low heat exchange efficiency, and slow response. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated device and method for non-contact multi-heat source molten salt heat storage and release, thereby solving the aforementioned technical problems.

[0005] To achieve the above objectives, the present invention provides an integrated non-contact multi-heat-source molten salt heat storage and release device, comprising:

[0006] A heat exchange container is filled with a heat-conducting medium, which is filled with molten salt. An insulation plate is arranged inside the heat exchange container and divides the heat-conducting medium and the molten salt into a first heat exchange zone and a second heat exchange zone along its height.

[0007] A thermally driven automatic stirring structure, which is divided into two groups and installed in the assembly boxes on the upper and lower surfaces of the insulation plate, respectively, to stir the molten salt located in the first heat exchange zone and the second heat exchange zone.

[0008] A heat exchange pipeline is embedded inside the heat-conducting medium and continuously wound around the outside of the molten salt. The heat exchange pipeline continuously passes through the first heat exchange zone and the second heat exchange zone. The two ends of the heat exchange pipeline are a first pipe port and a second pipe port, respectively, and both extend out of the heat exchange container. The first pipe port and the second pipe port are synchronously connected to a waste heat supply source for the molten salt to store heat or a heat-using device for the molten salt to release heat.

[0009] Preferably, the automatic stirring structure includes a temperature difference working cylinder, a temperature driving plug that reciprocates linearly within the temperature difference working cylinder, an eccentric wheel linkage mechanism connected to the power output end of the temperature driving plug, and a stirring mechanism. The temperature driving plug divides the interior of the temperature difference working cylinder into two temperature difference working chambers. One temperature difference working chamber is in contact with the heat-conducting medium, and the other temperature difference working chamber is located inside the assembly box. Under the action of the temperature difference between the two temperature difference working chambers, the temperature driving plug is driven to reciprocate, which in turn drives the stirring mechanism to rotate via the eccentric wheel linkage mechanism to stir the molten salt and make its temperature uniform.

[0010] Preferably, the eccentric wheel linkage mechanism includes an eccentric wheel and a linkage that converts the reciprocating linear motion of the temperature driving plug into the rotational motion of the eccentric wheel. The lower plate surface of the eccentric wheel is parallel to the bottom plate of the assembly box, and an eccentric shaft is vertically fixed on the lower plate surface. One end of the linkage is hinged to the eccentric shaft, and the other end is hinged to the power output end of the temperature driving plug, so as to drive the eccentric wheel to rotate through the linkage.

[0011] Preferably, the stirring mechanism includes a planetary reducer, a stirring shaft, and multiple stirring blades fixed on the outer wall of the stirring shaft. The power input end of the planetary reducer is driven to the shaft output end of the eccentric wheel. One end of the stirring shaft is driven to the power output end of the planetary reducer, and the other end passes through the assembly box and directly contacts the molten salt to stir the molten salt.

[0012] Preferably, an insulation plate is fixed vertically to the bottom plate inside the assembly box, and the insulation plate divides the assembly box into a heat-conducting cavity and an insulation cavity. The temperature difference working cylinder is located in the heat-conducting cavity, and the cylinder port end of the temperature difference working cylinder passes through the insulation plate. The eccentric wheel connecting rod mechanism and the stirring mechanism are both located in the insulation cavity.

[0013] Preferably, the wall of the assembly box corresponding to the heat-conducting cavity is made of a heat-conducting material, the specific heat capacity of which is not lower than that of the heat-conducting medium, so that the temperature change rate in the heat-conducting cavity is lower than that of the heat-conducting medium. A temperature difference is formed between the end of the temperature difference working cylinder that contacts the heat-conducting medium and the end of the temperature difference working cylinder located in the heat-conducting cavity, so as to drive the temperature driving plug to reciprocate axially within the temperature difference working cylinder.

[0014] Preferably, the melting point of the molten salt located in the first heat exchange zone is lower than that of the molten salt located in the second heat exchange zone.

[0015] Preferably, the heat exchange pipeline is a spiral pipeline and is coaxially arranged inside the heat exchange container. The first pipeline port extends from the second heat exchange zone, and the second pipeline port extends from the first heat exchange zone. Both the first pipeline port and the second pipeline port are connected in series with a flow regulating valve for controlling the fluid flow rate and a pipe reducer for switching and connecting the waste heat supply source or the heat-using equipment.

[0016] Preferably, both the first pipe port and the second pipe port are equipped with pipe reducers to switch between waste heat supply sources or heat-using equipment.

[0017] Preferably, both the first pipe port and the second pipe port are equipped with flow regulating valves connected in series to control the fluid flow rate.

[0018] Preferably, it also includes heating elements, which are connected to an external power supply via an external controller. The heating elements are multiple and are divided into a first group of heating elements and a second group of heating elements by the insulation plate, so as to control them to heat the heat-conducting medium in their respective areas.

[0019] The method of using the aforementioned non-contact multi-heat source molten salt heat storage and release integrated device includes the following steps:

[0020] S1. During the pre-use inspection stage, check that the heat exchange container and its internal structure are intact and usable, and debug the heat exchange pipeline and flow regulating valve.

[0021] S2. During the heat storage stage, during off-peak electricity hours, the first set of heating elements is controlled by an external controller to indirectly heat the molten salt stored in the first heat exchange zone; or the first set of heating elements and the second set of heating elements are simultaneously controlled by an external controller to indirectly heat the molten salt stored in the first and second heat exchange zones. During non-off-peak electricity hours, the pipe reducer of the heat exchange pipeline is connected to the waste heat supply source, waste heat gas is introduced, and the flow rate of the waste heat gas is controlled by a flow regulating valve to heat the molten salt in the first and second heat exchange zones, completing the heat exchange and heat storage process. During the molten salt heat storage process, the contact end between the temperature difference working cylinder and the heat transfer medium is the hot end, absorbing heat and increasing in temperature. The temperature difference working cylinder has a cold end located within the heat conduction cavity, creating a temperature difference between the two ends. The gas inside the hot end expands due to heat, pushing the temperature driving plug towards the cylinder opening. After the air moves to the cold end, its volume decreases, causing the temperature driving plug to return to its initial position. When the air returns to the hot end, it expands again due to heat, driving the temperature driving plug to reciprocate axially within the temperature difference working cylinder. This causes the temperature driving plug to drive the eccentric wheel to rotate via the connecting rod and the eccentric shaft, which in turn drives the stirring shaft to rotate and stir the molten salt. The heat conduction cavity continuously absorbs heat and heats up. After the heat storage is completed, the temperature of the heat conduction medium and the temperature inside the heat conduction cavity are the same, and the temperature driving plug stops moving, stopping the stirring.

[0022] S3. During the heat release stage, the connection between the heat exchange pipeline and the waste heat supply source is disconnected, and the pipe reducer of the heat exchange pipeline is connected to the heat-using equipment. Cold air or cold water from the heat-using equipment enters the heat exchange pipeline to complete the heat exchange and heat release process. The heat-conducting medium releases heat and cools down. The specific heat capacity of the heat-conducting cavity wall is higher than that of the heat-conducting medium, so the cooling rate inside the heat-conducting cavity is lower than that of the heat-conducting medium. The temperature inside the heat-conducting cavity is higher than that of the heat-conducting medium. One end of the temperature difference working cylinder located inside the heat-conducting cavity is the hot end, and the end of the temperature difference working cylinder in contact with the heat-conducting medium is the cold end, so that there is a temperature difference between the two ends of the temperature difference working cylinder, driving the temperature driving plug to reciprocate, thereby driving the eccentric wheel and the stirring shaft to rotate. After the heat release is completed, the temperature of the heat-conducting cavity and the heat-conducting medium are the same, the temperature driving plug stops moving, and the stirring stops.

[0023] Therefore, the present invention, employing the above-mentioned integrated device and method for non-contact multi-heat source molten salt heat storage and release, has the following beneficial effects:

[0024] 1. A thermally driven automatic stirring structure is set up. The temperature difference between the two ends of the working cylinder caused by the temperature change of the heat transfer medium itself causes the gas inside to expand, which pushes the temperature-driven plug to move and automatically drives the stirring shaft to rotate and stir. This realizes real-time stirring without external power, which completely solves the problems of local solidification, dead zone and reduced heat exchange efficiency caused by uneven temperature during molten salt heat storage and release. It significantly improves the system heat transfer coefficient and operational reliability. At the same time, it links the stirring power with the heat storage and release process, enhancing the autonomy of the device and the rationality of energy utilization.

[0025] 2. By setting a planetary reducer, the higher speed output by the automatic stirring structure can be converted into the appropriate speed required for stirring, while increasing the output torque. This ensures that the stirring shaft and stirring blades can effectively stir the molten salt, avoiding the problem of poor stirring effect due to excessive speed or insufficient torque. This makes the stirring action more suitable for the fluidity characteristics of molten salt and further improves the heat exchange uniformity.

[0026] 3. By installing an insulation plate, the assembly box is divided into a heat-conducting cavity and an insulation cavity. The temperature difference working cylinder, located in the heat-conducting cavity, has one end in direct contact with the heat-conducting medium, enabling efficient heat exchange. The other end is located inside the heat-conducting cavity, maintaining the working temperature difference during the heat storage phase. As the heat-conducting cavity absorbs heat and heats up, the temperature difference between the two ends of the temperature difference working cylinder gradually decreases until the heat storage ends and the temperature difference disappears, causing the stirring process to stop automatically. The operation of the automatic stirring structure is deeply linked with the heat storage process, achieving a self-adaptive effect of automatic stirring during heat storage and stopping stirring when heat storage stops, without the need for additional control devices. Meanwhile, the eccentric wheel, stirring shaft, and planetary reducer located in the insulation cavity reduce heat transfer, preventing high temperatures from affecting the operational stability and service life of mechanical components, while also reducing heat loss and ensuring the energy conversion efficiency of the automatic stirring structure.

[0027] 4. The cavity wall of the heat conduction cavity is made of a material with a higher specific heat capacity. When absorbing or releasing the same amount of heat, the rate of temperature change is significantly slower than that of the heat conduction medium. This allows the cavity wall to maintain a stable temperature difference with the heat conduction medium for a long time. During heat storage, the heat conduction medium heats up rapidly while the cavity wall heats up slowly, creating a temperature difference where the medium is hot and the heat conduction cavity is cold. During heat release, the heat conduction medium cools down rapidly while the cavity wall cools down slowly, creating a temperature difference where the heat conduction cavity is hot and the medium is cold. This ensures that the temperature difference provides the necessary temperature difference conditions for the temperature difference working cylinder to drive the piston movement. At the same time, the high specific heat capacity material is suitable for high-temperature environments and can stably maintain the structural strength of the cavity wall, ensuring reliable operation of the device throughout the entire heat storage and release cycle.

[0028] 5. Electric heating components and waste heat supply sources can work independently or in tandem: When there is sufficient electricity and the heat demand is low, electric heating can be used directly; when the heat demand is high, the electricity is insufficient and industrial waste heat is available, the system can switch to waste heat storage to match the heat storage heat with the heat demand, thus avoiding heat waste due to insufficient or excessive heat release.

[0029] 6. The external power supply adopts off-peak electricity, and the waste heat supply source adopts industrial waste gas. The low price advantage of off-peak electricity can be used to reduce the cost of heat storage, and the free waste heat of industrial waste gas can be used to reduce energy consumption, achieving the dual energy-saving effect of waste heat recovery and off-peak electricity consumption. It can not only improve the stability of system operation through complementary energy supply, but also reduce carbon emissions and comply with environmental protection policies.

[0030] 7. The heat exchange pipeline is wound around the outside of the molten salt, and heat is exchanged indirectly through the heat transfer medium, avoiding corrosion caused by direct contact between the molten salt and the pipeline; the spiral pipeline increases the heat exchange area and improves the heat exchange efficiency.

[0031] In summary, this device achieves the integrated goal of "high-efficiency heat storage, precise heat release, and low-loss operation" through automatic thermal energy-driven stirring of molten salt, dual-zone molten salt graded heat storage, non-contact heat exchange structure, and intelligent control of multiple heat sources. Compared with traditional systems, it significantly improves energy utilization, reliability, and scenario adaptability, and is especially suitable for integrated energy systems for industrial waste heat recovery, renewable energy consumption, and multi-scenario heat demand.

[0032] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0033] Figure 1 This is a cross-sectional view of the integrated non-contact multi-heat source molten salt heat storage and release device of the present invention.

[0034] Figure 2 For the present invention Figure 1 Enlarged structural diagram of part A.

[0035] Figure 3 This is a top view of the integrated non-contact multi-heat source molten salt heat storage and release device of the present invention.

[0036] Figure Labels

[0037] 1. Heat exchange container; 11. First heat exchange zone; 12. Second heat exchange zone; 13. Metal shell; 14. Insulation layer; 15. Refractory brick layer; 2. Heat transfer medium; 3. Molten salt; 4. Insulation board; 5. Heat exchange pipeline; 51. First pipeline port; 52. Second pipeline port; 53. Flow regulating valve; 6. Heating components; 7. Automatic stirring structure; 71. Temperature difference working cylinder; 711. Graphite rod; 72. Temperature driving plug; 73. Eccentric wheel and connecting rod mechanism; 731. Eccentric wheel; 732. Connecting rod; 733. Eccentric shaft; 74. Stirring mechanism; 741. Planetary reducer; 742. Stirring shaft; 743. Stirring blade; 8. Assembly box; 9. Insulation board. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of the present invention and are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0039] It should be noted that the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as a process, method, system, product, or server that includes a series of steps or units, not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or device.

[0040] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0041] Under normal conditions, a "non-contact" method is used to avoid corrosion. However, the molten salt is enclosed in a static cavity, and heat is indirectly transferred through buried pipes and heat transfer medium. There are no mechanical pumps or impellers in the system, and it relies entirely on natural convection. This static solution is prone to local temperature differences during the heat storage process, forming a thick sloping temperature layer, which leads to a significant decrease in effective heat storage density and power decay in the later stages of heat release. Direct non-contact heat exchange has low efficiency and slow response.

[0042] Based on the above analysis, this invention is designed as follows: Figures 1-3 As shown, an integrated non-contact multi-heat-source molten salt heat storage and release device includes:

[0043] A heat exchange container 1 is filled with a heat-conducting medium 2 and a molten salt 3. An insulation plate 4 is arranged inside the heat exchange container 1 and divides the heat-conducting medium 2 and the molten salt 3 into a first heat exchange zone 11 and a second heat exchange zone 12 along its height direction.

[0044] The thermally driven automatic stirring structure 7 is divided into two groups and installed in the assembly boxes 8 on the upper and lower surfaces of the insulation plate 4, respectively, to stir the molten salt located in the first heat exchange zone 11 and the second heat exchange zone 12.

[0045] The heat exchange pipeline 5 is embedded inside the heat-conducting medium 2 and continuously wound around the outside of the molten salt 3. The heat exchange pipeline 5 continuously passes through the first heat exchange zone 11 and the second heat exchange zone 12. The two ends of the heat exchange pipeline 5 are the first pipe port 51 and the second pipe port 52, respectively, and both extend out of the heat exchange container 1. The first pipe port 51 and the second pipe port 52 are synchronously connected to the waste heat supply source for storing heat in the molten salt 3 or the heat-using equipment for releasing heat from the molten salt 3.

[0046] Among them, the heat transfer medium 2 is responsible for heat transfer. It not only needs to have good thermal conductivity, but also needs to meet the requirement of low metal corrosion under high temperature conditions. Materials such as graphite can be used. It can efficiently transfer heat, balance the temperature of the area, has strong thermal shock resistance, long service life, is non-flammable and non-explosive and environmentally friendly. It can significantly reduce the risk of equipment corrosion and maintenance costs, and is suitable for the stringent requirements of high temperature heat exchange scenarios.

[0047] This invention divides the heat-conducting medium 2 and molten salt 3 inside the heat exchange container 1 into two independent heat exchange zones, namely the first heat exchange zone 11 and the second heat exchange zone 12, through the insulation plate 4. Two sets of heating elements 6 are used for off-peak electricity heating, and a spiral heat exchange pipeline 5 is used for waste heat exchange. During the molten salt heat storage process, the automatic stirring structure 7 automatically operates as the heat increases, stirring the molten salt to improve heat exchange efficiency. Furthermore, the melting point of the molten salt in the first heat exchange zone 11 is lower than that in the second heat exchange zone 12; that is, the first heat exchange zone 11 is a low-temperature heat storage zone, and the second heat exchange zone 12 is a high-temperature heat storage zone. The molten salt in the corresponding zone can be heated according to the heat demand of the heat-using equipment. When off-peak electricity is sufficient, the two sets of heating elements 6 can be selected for heating; when off-peak electricity is insufficient, heating is achieved by connecting to a waste heat supply source to meet the heat demand.

[0048] This invention has several embodiments regarding the heating mode and the heat release mode, including:

[0049] 1. During the heating process, when the heat demand of the heat-using equipment is small and within the heat storage threshold range of the molten salt in the first heat exchange zone 11, the first set of heating elements can be controlled to heat during off-peak electricity periods, so that the molten salt in the low-temperature heat storage zone can store heat. When the off-peak electricity is insufficient or not during off-peak electricity periods, it is connected to the waste heat supply source through the heat exchange pipeline, and the second pipeline port is the inlet end of the waste heat gas, and the first pipeline port is the outlet end of the waste heat gas, so as to exchange and store heat only for the molten salt in the low-temperature heat storage zone, thereby improving the heat storage efficiency. During this process, only the automatic stirring structure 7 located in the first heat exchange zone 11 is heated and automatically stirs the molten salt.

[0050] 2. When the molten salt heat storage capacity in the first heat exchange zone 11 is insufficient to meet the heat demand of the heat-using equipment, during off-peak electricity periods, the first and second sets of heating elements need to be controlled to synchronously and indirectly heat the molten salt in both zones for heat storage. When off-peak electricity is insufficient or outside of off-peak periods, the system connects to the waste heat supply source through heat exchange pipeline 5, with the first pipeline port 51 being the inlet of the waste heat gas and the second pipeline port 52 being the outlet of the waste heat gas. Through heat exchange pipeline 5, the gas entering heat exchange pipeline 5 synchronously heats the molten salt in both zones. The molten salt is used for indirect heating and heat storage. The high-temperature gas first passes through the second heat exchange zone 12, where the molten salt stores heat. Then it passes through the first heat exchange zone 11. Since the molten salt in the first heat exchange zone 11 has a small heat storage capacity and requires a low temperature, the gas that loses some heat in the second heat exchange zone 12 can also use its remaining heat to store heat in the molten salt in the first heat exchange zone 11, thus meeting the heat demand of the heat-using equipment. During this process, the automatic stirring structure 7 in both zones is heated and its temperature rises, and it stirs the molten salt in both zones.

[0051] 3. During the heat release process, disconnect the heat exchange pipeline 5 from the waste heat supply source, and connect the pipe reducer of the heat exchange pipeline 5 to the heat-using equipment. When the heat-using equipment requires less heat, it only needs to store and release heat in the molten salt located in the first heat exchange zone 11. Then, the first pipe port 51 is the inlet end of the heat-using fluid, and the second pipe port 52 is the outlet end of the heat-heated fluid to complete the heat exchange process.

[0052] 4. When the heat demand of the heat-using equipment is large, it is necessary for the molten salt in both heat exchange zones to store and release heat. Then, the first pipe port 51 is the outlet end of the heat-using fluid, and the second pipe port 52 is the inlet end of the heat-heated fluid. The fluid of the heat-using equipment flows in the heat exchange pipeline 5 in the direction of increasing heat exchange temperature gradient, so as to continuously exchange heat and raise the temperature in the heat exchange pipeline 5 to reach the target temperature and improve heat exchange efficiency.

[0053] In another embodiment of the present invention, since the molten salt is filled inside the heat-conducting medium, there is a probability that the two will mix during stirring. Therefore, to reduce the impact of stirring on the position of the heat-conducting medium without reducing thermal conductivity, a porous heat-conducting insulating mesh can be added between the molten salt and the heat-conducting medium. The porous heat-conducting insulating mesh is net-like, enclosing the molten salt inside to separate the molten salt and the heat-conducting medium. It also has multiple mesh openings for heat conduction, thus solving the problem of local voids or accumulation in the heat-conducting medium due to vigorous flow during traditional stirring. The design ensures that the molten salt is always surrounded by a uniform thermally conductive medium, allowing for even heat transfer during storage and efficient heat removal during release, thus improving heat exchange efficiency and stability. Without sacrificing thermal conductivity, it adapts to the dual-zone heat storage requirements: the first heat exchange zone uses a low-porosity isolation mesh to accommodate the low flow rate of the low-melting-point molten salt; the second heat exchange zone uses a high-porosity isolation mesh to accommodate the high flow rate of the high-melting-point molten salt. This satisfies the differentiated heat conduction and disturbance prevention requirements of the two zones while avoiding heat loss due to structural additions, perfectly aligning with the device's core objective of "precise heat storage and release."

[0054] In a specific embodiment of the automatic stirring structure 7 in this invention, it comprises a temperature difference working cylinder 71, a temperature driving plug 72 that reciprocates linearly within the temperature difference working cylinder 71, an eccentric wheel linkage mechanism 73 connected to the power output end of the temperature driving plug 72, and a stirring mechanism 74. The temperature driving plug 72 divides the interior of the temperature difference working cylinder 71 into two temperature difference working chambers. One temperature difference working chamber is in contact with the heat-conducting medium 2, and the other temperature difference working chamber is located inside the assembly box 8. Thus, under the action of the temperature difference between the two temperature difference working chambers, the temperature driving plug 72 is pushed to reciprocate, which in turn drives the stirring mechanism 74 to rotate via the eccentric wheel linkage mechanism 73 to stir the molten salt 3 and make its temperature uniform. The thermal energy of the heat transfer medium 2 is converted into mechanical energy by the thermal difference working cylinder 71. The thermal difference working cylinder 71 directly contacts the heat transfer medium 2 to obtain heat and form a temperature difference driving temperature driving plug 72 to reciprocate. Then, the eccentric wheel connecting rod mechanism 73 drives the stirring mechanism 74 to rotate, thereby stirring the molten salt. The molten salt can be automatically stirred by the heat energy in the system without external power, which improves the heat exchange efficiency between the molten salt and the heat transfer medium 2.

[0055] In the above embodiment, the eccentric wheel linkage mechanism 73 includes an eccentric wheel 731 and a connecting rod 732 that converts the reciprocating linear motion of the temperature drive piston 72 into the rotational motion of the eccentric wheel 731. The lower plate surface of the eccentric wheel 731 is parallel to the bottom plate of the assembly box 8, and an eccentric shaft 733 is vertically fixed on the lower plate surface. One end of the connecting rod 732 is hinged to the eccentric shaft 733, and the other end is hinged to the power output end of the temperature drive piston 72, so as to drive the eccentric wheel 731 to rotate through the connecting rod 732. The eccentric wheel 731 can directly convert the reciprocating linear motion of the temperature drive piston 72 into its own rotational motion, which has high transmission efficiency and does not require additional gears or cams, thus reducing energy loss.

[0056] In the above embodiment, the stirring mechanism 74 includes a planetary reducer 741, a stirring shaft 742, and multiple stirring blades 743 fixed on the outer wall of the stirring shaft 742. The power input end of the planetary reducer 741 is drivenly connected to the shaft output end of the eccentric wheel 731. One end of the stirring shaft 742 is drivenly connected to the power output end of the planetary reducer 741, and the other end passes through the assembly box 8 and directly contacts the molten salt 3 to stir the molten salt 3. The planetary reducer 741 converts the output speed of the eccentric wheel 731 into a speed suitable for stirring the molten salt, while increasing the output torque. This ensures that the stirring shaft 742 and the blades can effectively stir the molten salt to improve the heat exchange uniformity and avoid the problem of poor stirring effect caused by excessively high output speed or insufficient torque of the eccentric wheel 731. This makes the power transmission more suitable for the physical characteristics of the molten salt and further optimizes the heat exchange efficiency and operational stability of the device.

[0057] In the above embodiment, an insulation plate 9 is fixed vertically to the bottom plate inside the assembly box 8. The insulation plate 9 divides the assembly box 8 into a heat conduction cavity and an insulation cavity. The temperature difference working cylinder 71 is located in the heat conduction cavity, and the cylinder port end of the temperature difference working cylinder 71 passes through the insulation plate. The eccentric wheel connecting rod mechanism 73 and the stirring mechanism 74 are both located in the insulation cavity. The assembly box 8 is divided into a heat-conducting cavity and an insulation cavity. The temperature difference working cylinder 71, located in the heat-conducting cavity, has one end in direct contact with the heat-conducting medium 2, enabling efficient heat exchange with the medium. The other end is located inside the heat-conducting cavity, maintaining the working temperature difference during the heat storage stage. As the heat-conducting cavity absorbs heat and heats up, the temperature difference between the two ends of the temperature difference working cylinder 71 gradually decreases until the heat storage ends and the temperature difference disappears, causing the stirring process to stop automatically. The operation of the automatic stirring structure 7 is deeply linked with the heat storage process, achieving an adaptive effect of automatic stirring during heat storage and stopping stirring when heat storage stops, without the need for additional control devices. Meanwhile, the eccentric wheel 731, stirring shaft 742, and planetary reducer 741 located in the insulation cavity reduce heat transfer, preventing high temperatures from affecting the operational stability and service life of mechanical components, while also reducing heat loss and ensuring the energy conversion efficiency of the automatic stirring structure 7.

[0058] In the above embodiment, in order to ensure that a significant temperature difference is formed at both ends of the temperature difference working cylinder 71 during the heat storage and heat release process, the box wall of the assembly box 8 corresponding to the heat conduction cavity is made of a heat-conducting material. The specific heat capacity of the heat-conducting material is not lower than the specific heat capacity of the heat conduction medium 2, so that the temperature change rate in the heat conduction cavity is lower than the temperature change rate of the heat conduction medium 2. The end of the temperature difference working cylinder 71 that is in contact with the heat conduction medium 2 forms a temperature difference with the end of the temperature difference working cylinder 71 located in the heat conduction cavity, so as to drive the temperature driving plug 72 to reciprocate axially within the temperature difference working cylinder 71. Specifically, while using graphite as the heat transfer medium 2, the material of the wall corresponding to the heat transfer cavity in the assembly box 8 can be high-density magnesia brick, corundum mullite brick, or nickel-based high-temperature alloy. Among them, magnesia has a melting point as high as 2800℃, strong resistance to molten salt corrosion, and a lower thermal conductivity than graphite. It has a large heat capacity, absorbs heat slowly when heating up, and dissipates heat slowly when cooling down, significantly lagging behind the temperature change of graphite, stabilizing the temperature difference, and also withstanding long-term high-temperature immersion in molten salt. Corundum mullite brick, with Al2O3 and SiO2 as its main components, has a refractoriness of 1700℃. Above ℃, it exhibits excellent resistance to molten salt chemical corrosion. Its thermal conductivity is far lower than that of graphite, and it has high thermal inertia, resulting in a significantly slower heating and cooling rate than graphite. It can maintain an effective temperature difference with graphite in high-temperature molten salt environments for extended periods. The nickel-chromium alloy matrix can operate at temperatures above 1000℃, demonstrating outstanding resistance to molten salt corrosion. Its thermal conductivity is only 1 / 10 to 1 / 20 that of graphite, and the metal material has a higher heat capacity, absorbing more heat during heating and releasing heat more slowly during cooling, thus stably lagging behind the temperature changes of graphite. Simultaneously, the metal's strength ensures the stability of the cavity wall structure. By using materials with low thermal conductivity and high thermal inertia to construct the heat-conducting cavity, the effect of a temperature change rate lagging behind graphite is achieved, and both materials can adapt to the high temperature and chemical environment of molten salt, ensuring a continuous and effective temperature difference between the heat-conducting cavity and the heat-conducting medium, providing stable driving conditions for the automatic stirring structure.

[0059] During heat release, the heat-conducting medium 2 releases heat to the heat-using equipment through the heat exchange pipe 5, causing its temperature to drop rapidly. However, due to the material properties of the heat-conducting cavity wall, its cooling rate is much slower than that of graphite. This creates a new temperature difference: the temperature of the heat-conducting cavity is greater than the temperature of the heat-conducting medium. Because the heat-conducting cavity cools slowly, it maintains a relatively high temperature, making the portion of the temperature difference working cylinder 71 located within the heat-conducting cavity a new "hot end." The other end of the temperature difference working cylinder 71 contacts the rapidly cooling heat-conducting medium, becoming the "cold end." This temperature difference persists, driving the temperature-driven plug 72 to reciprocate, which in turn drives the stirring structure. As heat release continues, the temperature of the heat-conducting cavity slowly decreases, but always lags behind the cooling rate of the heat-conducting medium, until both reach the point where heat release ends, at which point the temperature difference completely disappears, and the mechanism stops. The continuous operation of the stirring structure during heat release prevents the molten salt from forming cold zones due to localized low temperatures, ensuring that the molten salt releases heat evenly throughout, guaranteeing efficient heat absorption and transfer to the heat-using equipment through the heat exchange pipe, and reducing residual heat within the molten salt.

[0060] In the above embodiment, a graphite rod 711 is also provided inside the thermostatic working cylinder 71. The graphite rod 711 has a vent hole that runs through it along the axial direction of the thermostatic working cylinder 71. The graphite rod 711 is assembled inside the thermostatic working cylinder 71 and is located between the hot end and the cold end of the thermostatic working cylinder 71. The graphite rod 711 has both good thermal conductivity and high temperature resistance. It can help adjust the temperature gradient of the gas inside the thermostatic working cylinder 71 through its own thermal conduction characteristics. At the same time, the vent hole ensures smooth flow of the working medium between the hot end and the cold end, promoting the gas expansion-contraction cycle. The graphite material is suitable for the high temperature environment inside the thermostatic working cylinder 71 and can stably maintain the structural strength. This not only enhances the response efficiency of the automatic stirring structure 7 to temperature difference, but also ensures the continuity of the working medium circulation and improves the stability of the mechanism operation.

[0061] In other embodiments of the present invention, the melting point of the molten salt located in the first heat exchange zone 11 is defined as lower than the melting point of the molten salt located in the second heat exchange zone 12. Specifically, the molten salt located in the first heat exchange zone 11 may be a ternary salt, and the molten salt located in the second heat exchange zone 12 may be a binary salt.

[0062] In a specific embodiment of the heat exchange pipeline 5 in this invention, the heat exchange pipeline 5 is a spiral pipeline arranged coaxially inside the heat exchange container 1. The first pipeline port 51 extends from the second heat exchange zone 12, and the second pipeline port 52 extends from the first heat exchange zone 11. Compared with a straight pipeline, the spiral shape can significantly extend the pipeline length within the same container volume, directly increasing the contact area between the heat exchange pipeline 5 and the heat transfer medium 2. The coaxial arrangement ensures that the distance between the spiral pipeline and the inner wall of the heat exchange container 1 is uniform, avoiding local dead corners, allowing the heat transfer medium 2 to evenly wrap around the heat exchange pipeline 5, reducing heat exchange losses caused by uneven local temperatures, and making the heat exchange more complete.

[0063] The arrangement of the spiral heat exchange pipeline 5 in this invention is only a preferred embodiment of the invention, and there are no restrictions on the spiral direction, number of turns, or angle. It can be changed according to specific conditions.

[0064] In the above embodiments, both the first pipe port 51 and the second pipe port 52 are equipped with pipe reducers. The reducers directly enable the heat exchange pipe 5 to be sealed to at least two different pipe diameters, thereby facilitating its connection with different waste heat supply sources or heat-using equipment for the heat storage and release process of molten salt 3. This avoids connection difficulties or the need for additional pipe customization due to pipe diameter mismatch, and greatly improves the compatibility and flexibility of system assembly.

[0065] In the above embodiments, flow regulating valves 53 are connected in series at both the first pipe port 51 and the second pipe port 52. In the prior art, the flow regulating valve 53 is divided into manual regulation mode and automatic regulation mode. When applied in the heat exchange pipeline 5, the valve opening can be changed manually or automatically to accurately regulate the flow rate of the medium flowing through the heat exchange pipeline 5, so that the heat exchange rate matches the system demand in real time, avoiding the problem of energy waste due to excessive flow or insufficient heat exchange due to insufficient flow, and maximizing energy utilization efficiency.

[0066] In other embodiments of the present invention, a heating element 6 is also included. The heating element 6 is connected to an external power supply via an external controller. There are multiple heating elements 6, which are divided into a first group of heating elements and a second group of heating elements by the insulation plate 4, so as to control them to heat the heat-conducting medium in the corresponding area respectively. It can independently or synchronously control two sets of heating elements through the controller to achieve differentiated heating of the first and second heat exchange zones. For example, when the heat demand is low, only the first set is activated to heat the low-melting-point molten salt, and when the demand is high, both sets are activated simultaneously to heat the molten salt in both zones, accurately matching the heat load and avoiding the heat excess or deficiency caused by the overall temperature rise of traditional single-set heating. It can also reduce ineffective energy consumption by relying on zone control. For example, when only low-temperature heat is needed, there is no need to heat the high-melting-point molten salt area. Combined with an external controller, it can flexibly adapt to concentrated heating during off-peak hours, further reducing the cost of heat storage. At the same time, the independent operation of the two sets of heating elements can also form redundancy. If one set fails, the other set can still maintain heat storage in the corresponding area, avoiding the overall system shutdown. It complements the waste heat heating and greatly improves the adaptability and operational stability of the device under different heat use scenarios.

[0067] Specifically, the heating element 6 in this invention is either resistive or electromagnetic. The resistive heating element can withstand the working temperature of the molten salt for a long time and has no complex moving parts, resulting in a low failure rate. The electromagnetic heating element directly transfers heat to the molten salt without intermediate heat loss links, resulting in high heating efficiency.

[0068] Furthermore, in this invention, since the second heat exchange zone 12 is a high-temperature heat storage zone, which requires a higher heating power, the number of heating elements included in the second group of heating elements is greater than the number of heating elements included in the first group of heating elements, so as to improve the heating power of the second heat exchange zone 12 and ensure the synchronization of heat storage time in the two zones.

[0069] A specific embodiment of the heat exchange container 1 in this invention is shown below. Figure 1-2As shown, the heat exchange container 1 has multiple layers, consisting of a metal shell 13, an insulation layer 14, and a refractory brick layer 15 from the inside out. The heat transfer medium 2 is filled inside the metal shell 13. The inner metal shell 13 ensures stable pressure resistance and efficient heat transfer of the heat transfer medium 2. The middle insulation layer 14 reduces heat loss to the outside to improve heat exchange efficiency. The outer refractory brick layer 15 can withstand external high-temperature environments or impacts. The three-layer structure works together to achieve the container's safe pressure resistance, efficient insulation, and external protection functions, while ensuring that the heat transfer medium 2 completes the heat exchange process in a stable environment.

[0070] In the above embodiments, the heat exchange pipeline 5 is suspended inside the heat exchange container 1 by the support component, which can avoid local heat loss caused by direct contact with the container wall, ensure that the heat transfer medium 2 can uniformly wrap the heat exchange pipeline 5 to improve heat exchange efficiency, reduce the thermal stress generated by the container wall due to direct exposure to high temperature, reduce the risk of structural damage, and reduce the contact area between the support component and the molten salt 3 and pipeline to reduce heat conduction loss, thereby improving the overall heat exchange stability of the system and the service life of the equipment.

[0071] A method for using a non-contact, multi-heat-source integrated molten salt heat storage and release device includes the following steps:

[0072] S1. During the pre-use inspection stage, check that the heat exchange container 1 and its internal structure are intact and usable, and debug the heat exchange pipeline 5 and the flow regulating valve 53.

[0073] S2. During the heat storage stage, in off-peak hours, the first set of heating elements is controlled by an external controller to indirectly heat the molten salt stored in the first heat exchange zone 11; or the first and second sets of heating elements are simultaneously controlled by an external controller to indirectly heat the molten salt stored in the first and second heat exchange zones 11 and 12. In non-off-peak hours, the pipe reducer of the heat exchange pipeline 5 is connected to the waste heat supply source, and waste heat gas is introduced. The flow rate of the waste heat gas is controlled by the flow regulating valve 53 to heat the molten salt in the first and second heat exchange zones 11 and 12, thus completing the heat exchange and heat storage process. During the molten salt heat storage process, the end of the temperature difference working cylinder 71 that contacts the heat transfer medium 2 is the hot end, which absorbs heat and increases in temperature. The temperature difference working cylinder 71 has a cold end located at one end within the heat conduction cavity, creating a temperature difference between the two ends. The gas inside the hot end expands due to heat, pushing the temperature driving plug 72 towards the cylinder opening. After the air moves to the cold end, its volume decreases, causing the temperature driving plug 72 to move to its initial position. After the air returns to the hot end, it expands again due to heat, driving the temperature driving plug 72 to reciprocate axially within the temperature difference working cylinder 71. This causes the temperature driving plug 72 to drive the eccentric wheel 731 to rotate via the connecting rod 732 and the eccentric shaft 733, which in turn drives the stirring shaft 742 to rotate and stir the molten salt. The heat conduction cavity continuously absorbs heat and rises in temperature. After the heat storage is completed, the temperature of the heat conduction medium 2 and the temperature inside the heat conduction cavity are the same, and the temperature driving plug 72 stops moving and stirring stops.

[0074] S3. During the heat release stage, the connection between the heat exchange pipeline 5 and the waste heat supply source is disconnected, and the pipe reducer of the heat exchange pipeline 5 is connected to the heat-using equipment. The cold air or cold water of the heat-using equipment enters the heat exchange pipeline to complete the heat exchange and heat release process. The heat transfer medium 2 releases heat and cools down. The specific heat capacity of the heat transfer cavity wall is higher than that of the heat transfer medium 2, so the cooling rate inside the heat transfer cavity is lower than that of the heat transfer medium 2, and the temperature inside the heat transfer cavity is higher than that of the heat transfer medium 2. The end of the temperature difference working cylinder 71 located inside the heat transfer cavity is the hot end, and the end of the temperature difference working cylinder 71 in contact with the heat transfer medium is the cold end, so that there is a temperature difference between the two ends of the temperature difference working cylinder 71, which drives the temperature driving plug 72 to reciprocate, thereby driving the eccentric wheel 731 and the stirring shaft 742 to rotate. After the heat release is completed, the temperature of the heat transfer cavity and the temperature of the heat transfer medium 2 are the same, the temperature driving plug 72 stops moving, and the stirring stops.

[0075] In summary, during the thermal storage stage, the automatic stirring structure absorbs heat to drive stirring, avoiding localized overheating or unmelted dead zones in the dual-zone molten salt. This accelerates the melting of low-melting-point molten salt, shortening the thermal storage start-up time, and breaks the thermal stratification phenomenon of high-melting-point molten salt, ensuring that the overall temperature reaches the phase change point synchronously. This improves thermal storage efficiency and energy utilization, and is suitable for the uniform heat transfer requirements when switching between multiple heat sources such as off-peak electricity and waste heat. During the heat release stage, a temperature difference still exists at both ends of the temperature difference working cylinder, continuing to stir the molten salt. This prevents solidification and blockage caused by sudden drops in local temperature of the molten salt, while allowing the heat transfer medium to uniformly absorb the heat released by the molten salt and transfer it to the heat exchange pipeline. This ensures that the heat-using equipment receives a stable heat supply and avoids heat output fluctuations. This solves the problems of slow thermal storage start-up, wasted thermal storage capacity, unstable heat output, and corrosion caused by direct contact between molten salt and stirring components in traditional molten salt thermal storage systems due to the lack of stirring. At the same time, no external power supply is required, which aligns with the energy-saving and non-contact heat exchange design principles of the device, further improving the system's reliability and adaptability.

[0076] In addition, during the heat storage stage, the heating mode can be flexibly switched according to the heat demand—single-group heating when the heat is low, dual-group simultaneous heating when the heat is high, and waste heat can be used when electricity is insufficient. This not only accurately matches the load and reduces energy waste, but also ensures the continuity of heat storage through the complementarity of multiple heat sources. During the heat release stage, it can be connected to the heat-using equipment through simple pipeline switching to achieve efficient heat transfer. The overall process takes into account demand adaptability, energy economy and ease of operation, ensuring that the device can stably and efficiently complete the heat storage and release cycle under different operating conditions. Moreover, the heat source for heat storage can come from electricity, that is, heat energy obtained from new energy sources such as photovoltaic, solar thermal, wind power and nuclear power, as well as waste heat energy obtained from industrial waste gas such as boilers. The heat energy sources are wide-ranging, and the cost of both heat energy sources is low, which reduces the cost of heat storage and achieves efficient heat energy storage. At the same time, it also solves the problems of off-peak electricity abandonment and waste gas loss, all of which are effectively utilized.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A non-contact, multi-heat source, molten salt heat storage integrated device, characterized in that, The application relates to a heat exchange container (1) filled with a heat-conducting medium (2) filled with a molten salt (3), a temperature insulation plate (4) arranged inside the heat exchange container (1) and separating the heat-conducting medium (2) and the molten salt (3) into a first heat exchange area (11) and a second heat exchange area (12) along the height direction of the heat exchange container (1); a heat energy driven automatic stirring structure (7) divided into two groups and installed in the assembling boxes (8) of the upper and lower plate surfaces of the temperature insulation plate (4) respectively to stir the molten salt in the first heat exchange area (11) and the second heat exchange area (12) respectively; a heat exchange pipeline (5) embedded in the heat-conducting medium (2) and continuously arranged outside the molten salt (3), the heat exchange pipeline (5) continuously passing through the first heat exchange area (11) and the second heat exchange area (12), the two ends of the heat exchange pipeline (5) being respectively a first pipeline port (51) and a second pipeline port (52) and both extending out of the heat exchange container (1), the first pipeline port (51) and the second pipeline port (52) being synchronously connected to supply the waste heat of the heat storage of the molten salt (3) or to supply the heat utilization equipment of the heat release of the molten salt (3); the automatic stirring structure (7) comprises a temperature difference working cylinder (71), a temperature driven plug (72) performing reciprocating linear motion in the temperature difference working cylinder (71), an eccentric wheel connecting rod mechanism (73) connected with the power output end of the temperature driven plug (72) and a stirring mechanism (74), the temperature driven plug (72) divides the inside of the temperature difference working cylinder (71) into two temperature difference working cavities, one of which is in contact with the heat-conducting medium (2) and the other of which is located in the assembling box (8), so that the temperature driven plug (72) is driven to reciprocate under the temperature difference of the two temperature difference working cavities and drives the stirring mechanism (74) to rotate through the eccentric wheel connecting rod mechanism (73) to stir the molten salt (3) and make the temperature of the molten salt (3) uniform; the application further comprises heating components (6) connected with an external power supply through an external controller, the heating components (6) are multiple and are divided into a first group of heating components and a second group of heating components by the temperature insulation plate (4) to control the heating of the heat-conducting medium in the corresponding areas respectively. The eccentric wheel connecting rod mechanism (73) comprises an eccentric wheel (731) and a connecting rod (732) converting the reciprocating linear motion of the temperature driven plug (72) into the rotary motion of the eccentric wheel (731), the lower plate surface of the eccentric wheel (731) is parallel to the bottom plate of the assembling box (8) and a eccentric shaft (733) is vertically fixed on the lower plate surface, one end of the connecting rod (732) is hinged with the eccentric shaft (733) and the other end is hinged with the power output end of the temperature driven plug (72) to drive the eccentric wheel (731) to rotate through the connecting rod (732). ​ ​ ​ ​ 2. The non-contact, multi-heat source, molten salt heat storage integration device of claim 1, wherein, ​ 3. The non-contact, multi-heat source, molten salt heat storage integrated device of claim 2, wherein, The stirring mechanism (74) comprises a planetary reducer (741), a stirring shaft (742) and a plurality of stirring blades (743) fixed on the outer wall of the stirring shaft (742), the power input end of the planetary reducer (741) is in transmission connection with the shaft center output end of the eccentric wheel (731), one end of the stirring shaft (742) is in transmission connection with the power output end of the planetary reducer (741), and the other end penetrates through the assembly box (8) and is in direct contact with the molten salt (3) so as to stir the molten salt (3).

4. The non-contact, multi-heat source, molten salt heat storage integrated device of claim 3, wherein, The assembly box (8) is vertically fixed with an insulating plate (9) at the bottom plate, the insulating plate (9) divides the assembly box (8) into a heat conduction cavity and an insulating cavity, the temperature difference working cylinder (71) is located in the heat conduction cavity, and the cylinder port end of the temperature difference working cylinder (71) penetrates through the insulating plate, and the eccentric wheel connecting rod mechanism (73) and the stirring mechanism (74) are located in the insulating cavity.

5. The non-contact, multi-heat source, molten salt heat storage integrated device of claim 4, wherein, The box wall of the assembly box (8) corresponding to the heat conduction cavity is made of a heat conduction material, the specific heat capacity of the heat conduction material is not less than the specific heat capacity of the heat conduction medium (2), the temperature change rate in the heat conduction cavity is lower than the temperature change rate of the heat conduction medium (2), and the end of the temperature difference working cylinder (71) in contact with the heat conduction medium (2) and the end of the temperature difference working cylinder (71) located in the heat conduction cavity form a temperature difference, so as to drive the temperature driving plug (72) to reciprocatingly move axially in the temperature difference working cylinder (71).

6. The non-contact, multi-heat source, molten salt heat storage integration device of claim 5, wherein, The melting point of the molten salt located in the first heat exchange zone (11) is lower than the melting point of the molten salt located in the second heat exchange zone (12).

7. The non-contact, multi-heat source, molten salt heat storage integration device of claim 6, wherein, The heat exchange pipeline (5) is a spiral pipeline coaxially arranged inside the heat exchange container (1), the first pipeline port (51) extends from the second heat exchange zone (12), and the second pipeline port (52) extends from the first heat exchange zone (11); the first pipeline port (51) and the second pipeline port (52) are both provided with a flow regulating valve (53) for controlling fluid flow and a pipeline reducing joint for switching a waste heat supply source or a heat utilization device.

8. The method of using a non-contact, multi-heat source, molten salt heat storage integrated device of claim 7, wherein, The method comprises the following steps: S1, a pre-use inspection stage, checking whether the heat exchange container (1) and its internal structure are intact and usable, and debugging the heat exchange pipeline (5) and the flow regulating valve (53); S2, the heat storage stage, in the valley time period, the first group of heating components are controlled by the external controller to indirectly heat the molten salt heat storage located in the first heat exchange area (11); or the first group of heating components and the second group of heating components are synchronously controlled by the external controller to indirectly heat the molten salt heat storage in the first heat exchange area (11) and the second heat exchange area (12); in the non-valley time period, the pipe reducing joint of the heat exchange pipeline (5) is connected with the waste heat supply source, the waste heat gas is introduced, and the waste heat gas flow is controlled through the flow regulating valve (53) to heat the molten salt in the first heat exchange area (11) and the second heat exchange area (12), and the heat exchange and heat storage process is completed; the temperature difference working cylinder (71) is in contact with the hot end of the heat conducting medium (2), absorbs heat, and the temperature rises, one end of the temperature difference working cylinder (71) located in the heat conducting cavity is the cold end, so that the temperature difference is formed between the two ends of the temperature difference working cylinder (71), the internal gas at the hot end is heated and expanded, pushes the temperature driving plug (72) to move towards the cylinder port, the air volume is reduced after moving to the cold end, the temperature driving plug (72) moves to the initial position, the air is heated and expanded again after returning to the hot end, drives the temperature driving plug (72) to reciprocatingly move axially in the temperature difference working cylinder (71), the temperature driving plug (72) drives the eccentric wheel (731) to rotate through the connecting rod (732) and the eccentric shaft (733), and then drives the stirring shaft (742) to rotate and stir the molten salt, the heat conducting cavity continuously absorbs heat and rises in temperature, after the heat storage is completed, the temperature of the heat conducting medium (2) and the heat conducting cavity is the same, and the temperature driving plug (72) stops moving and stirring; S3, the heat release stage, the communication between the heat exchange pipeline (5) and the waste heat supply source is disconnected, and the pipe reducing joint of the heat exchange pipeline (5) is connected with the heat using equipment, the cold gas or cold water of the heat using equipment enters the heat exchange pipeline, and the heat exchange and heat release process is completed; the heat conducting medium (2) releases heat and cools down, the specific heat capacity of the body wall of the heat conducting cavity is higher than that of the heat conducting medium (2), so that the cooling rate inside the heat conducting cavity is lower than that of the heat conducting medium (2), the temperature of the heat conducting cavity is higher than that of the heat conducting medium (2), one end of the temperature difference working cylinder (71) located in the heat conducting cavity is the hot end, one end of the temperature difference working cylinder (71) in contact with the heat conducting medium is the cold end, so that the temperature difference exists between the two ends of the temperature difference working cylinder (71), drives the temperature driving plug (72) to reciprocatingly move, and then drives the eccentric wheel (731) and the stirring shaft (742) to operate; after the heat release is completed, the temperature of the heat conducting cavity and the heat conducting medium (2) is the same, and the temperature driving plug (72) stops moving and stirring.

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