A bucket lifting type molten salt solid heat storage and exchange device and system

Abstract

The application provides a bucket lifting type molten salt solid heat storage and exchange device and system, which comprises an outer wall, the outer wall enclosing a closed space; a circulating transmission mechanism arranged in the closed space and configured to move in a vertical direction under the driving of a driving mechanism; a plurality of transport hoppers distributed on the circulating transmission mechanism at intervals, the bottom of the transport hoppers being provided with a hole structure allowing molten salt to pass through and blocking solid particles from passing through; a heat exchange chamber arranged on a first side of the circulating transmission mechanism, the first side being a path segment of the transport hoppers moving upward in the vertical direction; the outer wall being provided with a molten salt distribution port and a particle feeding port in communication with the heat exchange chamber; a particle collection chamber arranged on a second side of the circulating transmission mechanism; and a molten salt collection chamber arranged below the circulating transmission mechanism. The bucket lifting type molten salt solid heat storage and exchange device provided by the application effectively avoids the problem of heat exchange dead zones caused by the non-flowing area in the middle and lower parts of the existing spray bed due to natural flow, and significantly improves the overall heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of molten salt solid heat exchange technology, specifically to a bucket elevator type molten salt solid storage heat exchange device and system. Background Technology

[0002] With the continuous growth of global renewable energy installed capacity, the volatility and intermittency of new energy sources such as wind and solar power are becoming increasingly prominent. Long-term energy storage technology that can last for more than 4 hours can not only improve the absorption capacity of new energy sources, but also balance the grid load. Vigorously developing long-term energy storage has become a key to promoting the global green new energy transformation.

[0003] Among them, molten salt solid energy storage and heat exchange technology, which uses solid particles as heat storage materials and molten salt as heat exchange medium, has become a research hotspot in the field of long-term energy storage.

[0004] However, existing molten salt solid spray bed technology has significant drawbacks in practical applications: the system uses a fixed bed structure, and the internal flow relies on the natural infiltration of molten salt. This results in sufficient contact between the upper particles and the molten salt, but the middle and lower regions form large-scale stagnant zones due to insufficient flow velocity (e.g., ...). Figure 1 As shown in the figure, the flow uniformity is poor and the heat exchange efficiency is low. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a bucket elevator-type molten salt solid storage heat exchange device that effectively avoids the heat exchange dead zone problem caused by the stagnant area in the middle and lower part of the existing spray bed due to natural flow, and significantly improves the overall heat exchange efficiency.

[0006] The first aspect of the present invention provides a bucket elevator type molten salt solid storage heat exchange device, comprising: The outer wall encloses and forms a closed space; A cyclic transmission mechanism, located within the enclosed space, is configured to cyclically move in the vertical direction under the drive of a drive mechanism. A transport hopper, wherein multiple transport hoppers are spaced apart on the circulating conveying mechanism, and the bottom of the transport hopper is provided with a perforated structure that allows molten salt to pass through and blocks solid particles from passing through; A heat exchange chamber is located on the first side of the circulating conveying mechanism. The first side is the path segment through which the conveying hopper moves vertically upward. The outer wall is provided with a molten salt feeding port and a particle feeding port that communicate with the heat exchange chamber. The molten salt feeding port is located above the first side, and the particle feeding port is located below the heat exchange chamber. The particle collection chamber is located on the second side of the circulating conveying mechanism, and the second side is the path segment through which the conveying hopper moves downward in the vertical direction; A molten salt collection chamber is located within the enclosed space and below the circulating transport mechanism; Molten salt enters the heat exchange chamber through the molten salt feeding port, passes through the conveying hopper on the first side of the circulation conveying mechanism from top to bottom, and then collects in the molten salt collection chamber; solid particles are injected into the conveying hopper on the first side of the circulation conveying mechanism through the particle feeding port, and then rise with the conveying hopper through the circulation. During the rise, they dynamically contact and exchange heat with the molten salt, and are then transported to the second side of the circulation conveying mechanism and collected in the particle collection chamber.

[0007] In one embodiment of the present invention, the top of the conveying hopper is an open-type particle receiving cavity, the particle receiving cavity extends in a vertical direction, and the bottom of the particle receiving cavity is connected to a downwardly tapering guide section, the guide section being composed of an inclined sidewall and a bottom plate, and the hole structure is provided on both the sidewall of the conveying hopper and the bottom plate. After the transport hopper is moved to the second side of the circulation transport mechanism, the solid particles in the transport hopper are transferred to the particle collection chamber through the inclined sidewall, and the molten salt particles in the transport hopper are collected into the molten salt collection chamber through the hole structure.

[0008] In one embodiment of the present invention, the outlet end of the molten salt collection chamber is provided with a screen for blocking solid particles mixed in the molten salt.

[0009] In one embodiment of the present invention, the inner wall of the open-type particle receiving cavity is an arc-shaped inner wall.

[0010] In one embodiment of the present invention, the central axis of the molten salt feeding port coincides with the central axis of the transport hopper on the first side of the circulating transport mechanism.

[0011] In one embodiment of the present invention, a spray structure is provided at the molten salt feeding port, and the spray structure is configured to reciprocate along a motion track to uniformly disperse molten salt particles into the transport hopper.

[0012] In one embodiment of the present invention, a detection module is provided at the outlet of the particle feeding port, and the detection module is configured to: When the transport hopper is detected to have moved to the area corresponding to the particle feeding port, the particle feeding port is controlled to open. When the transport hopper is detected to have moved out of the area corresponding to the particle feeding port, the particle feeding port is controlled to close.

[0013] In one embodiment of the present invention, the outlet end of the particle collection chamber is provided with a particle outlet pipe, and the particle outlet pipe forms an angle of 15-60° with the horizontal plane.

[0014] A second aspect of the present invention provides a bucket elevator-type molten salt solid storage heat exchange system, including the aforementioned bucket elevator-type molten salt solid storage heat exchange device.

[0015] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: This invention provides a bucket elevator type molten salt solid storage heat exchange device. The molten salt is driven to move dynamically in the vertical direction by a circulating transmission mechanism, so that the molten salt and particles flow in opposite directions in stages within the bucket unit for heat exchange. The molten salt seepage path is controllable and the distribution is uniform. This effectively avoids the heat exchange dead zone problem caused by the stagnant area in the middle and lower part of the existing spray bed due to natural flow, and significantly improves the overall heat exchange efficiency.

[0016] This invention provides a bucket elevator type molten salt solid storage heat exchange device. The bottom and side walls of the conveying hopper are designed with a pore structure with a pore size smaller than the particle size. This allows molten salt to pass through while blocking uncrushed solid particles. Residual debris is filtered through the screen in the molten salt collection chamber. Combined with the periodic movement of the conveying hopper and the particle guiding and separation mechanism, the broken particles in the hopper are dynamically cleaned, avoiding debris accumulation that could cause pore blockage and ensuring long-term stable operation of the system.

[0017] This invention provides a bucket elevator type molten salt solid storage heat exchange device. By adjusting the power of the drive mechanism (such as a motor), the circulation rate of the transport bucket can be controlled, thereby adjusting the contact time and heat exchange intensity between the molten salt and the particles. At the same time, the system supports real-time replenishment and removal of particles. It can flexibly match actual energy storage needs without the need for expansion or reconstruction of fixed storage tanks, thereby reducing initial investment and operation and maintenance costs.

[0018] This invention provides a bucket elevator type molten salt solid storage heat exchange device. Based on the vertical circulation layout of the modular transport bucket, it reduces the equipment's footprint compared to the traditional tall and slender spray bed. At the same time, the molten salt flow path is simplified, reducing equipment pressure drop and energy consumption. The outer wall adopts a composite structure of aluminum silicate fiber cotton and corrosion-resistant steel shell, which further enhances high-temperature sealing and resistance to molten salt corrosion, and extends service life.

[0019] This invention provides a bucket elevator type molten salt solid storage heat exchange device. The distance detection device configured at the particle feeding port can sense the position of the transport hopper in real time and accurately control the particle injection sequence. Combined with the coordinated design of the molten salt distribution port and the hopper's posture, it realizes the automated switching and parameter matching of the storage and release processes, improving the system response speed and control accuracy. Attached Figure Description

[0020] Figure 1 This describes the liquid distribution inside the existing molten salt spray bed. Figure 2 This is a schematic diagram of the structure of the bucket elevator-type molten salt solid storage heat exchange system provided in an embodiment of the present invention; Reference numerals: 01-Outer wall; 02-Lifting system; 021-Equipment frame; 022-Motor; 023-Motor belt; 024-Driven conveying device gear; 025-Conveying chain; 026-Transporting hopper; 027-Support leg; 03-Heat exchange chamber; 031-Particle feeding port; 032-Molten salt distribution port; 04-Separation chamber; 05-Particle collection chamber; 051-Particle discharge port; 06-Molten salt collection chamber; 061-Molten salt outlet pipe; 1-Bucket-type molten salt solid storage heat exchange device; 2-Molten salt pump; 3-Pipeline; 4-Heat exchange equipment. Detailed Implementation

[0021] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0022] The present invention will be further described below through specific embodiments.

[0023] Example 1 This embodiment provides a bucket elevator type molten salt solid storage heat exchange device 1, including: Outer wall 01, the outer wall 01 encloses and forms a closed space; The cyclic transmission mechanism 02 is located in an enclosed space and is configured to move cyclically in the vertical direction under the drive of the drive mechanism. Transport hopper 026, multiple transport hoppers 026 are spaced apart on the circulating conveying mechanism 02, and the bottom of the transport hopper 026 is provided with a perforated structure that allows molten salt to pass through and blocks solid particles from passing through; The heat exchange chamber 03 is located in a closed space and is located on the first side of the circulation transmission mechanism 02. The first side is the path section of the transport hopper 026 that moves vertically upward. The outer wall 01 is provided with a molten salt feeding port 032 and a particle feeding port 031 that are connected to the heat exchange chamber 03. The molten salt feeding port 032 is located above the first side, and the particle feeding port 031 is located below the heat exchange chamber 03. The particle collection chamber 05 is located in an enclosed space and is situated on the second side of the circulating conveying mechanism 02. The second side is the path segment through which the conveying hopper 026 moves downward in the vertical direction. Molten salt collection chamber 06 is located in an enclosed space and below the circulation transfer mechanism 02; Molten salt enters the heat exchange chamber 03 through the molten salt feeding port 032, and passes through the conveying hopper 026 on the first side of the circulation conveying mechanism 02 from top to bottom before being collected in the molten salt collection chamber 06. Solid particles are injected into the conveying hopper 026 on the first side of the circulation conveying mechanism 02 through the particle feeding port 031, and then rise with the conveying hopper 026. During the rise, they dynamically contact and exchange heat with the molten salt, and are then transported to the second side of the circulation conveying mechanism 02 before being collected in the particle collection chamber 05.

[0024] Currently, spray-type solid packed beds are designed to be tall and slender, with uniform mixing of particles and molten salt in the upper part, while the middle and lower two-thirds of the area are naturally flowing. This results in large stagnant areas below the middle, leading to uneven heat transfer and other unresolved issues. This embodiment employs a moving bed design to disperse and heat the particles, avoiding the uneven heat transfer caused by natural flow due to excessive height.

[0025] In one embodiment, the outer wall 01 is in the form of an outer insulation layer plus an inner steel shell.

[0026] Preferably, the insulation layer thickness is 300-600mm, and the insulation material is selected as a low-density, low-thermal-conductivity material, such as aluminum silicate fiber cotton. The steel shell thickness is 12-32mm, made of molten salt corrosion-resistant and high-temperature-resistant structural steel, such as 347H.

[0027] In one embodiment, specifically, the circulating transmission mechanism 02 includes a device frame 021, a motor 022, a motor belt 023, a driven conveying device gear 024, a conveying chain 025, a conveying hopper 026 / 026, and support legs 027. The device frame 021 is located at the bottom of the enclosed space via the support legs 027, which separate the circulating transmission mechanism 02 from the molten salt collection chamber 06. The driven conveying device gear 024 and the conveying chain 025 are both mounted on the device frame 021. The conveying chain 025 has a closed ring structure. The driven conveying device gear 024 meshes with the conveying chain 025. The drive mechanism is located outside the enclosed space and is connected to the driven conveying device gear 024 in a transmission link, driving the driven conveying device gear 024 to rotate. The driven conveying device gear 024 drives the conveying chain 025 to form a circular motion trajectory in the vertical plane. Multiple transport hoppers 026 are installed at intervals on the conveyor chain 025, and the conveyor chain 025 drives the transport hoppers 026 to move in a vertical direction in a circular motion.

[0028] Furthermore, the device frame 021, driven conveying device gear 024, conveying chain 025, conveying hopper 026, and support leg 027 can all be made of molten salt corrosion resistant and high temperature resistant structural steel such as 347H, to improve high temperature corrosion resistance and wear resistance, extend device life, and improve system reliability.

[0029] In another embodiment, the cyclic transmission mechanism 02 includes an upper and lower aligned driving wheel and a driven wheel, and a transmission element that surrounds both. The upper and lower aligned driving wheel and driven wheel enable the transmission element to form a circular motion trajectory in a vertical plane. The drive mechanism is located outside the enclosed space and is connected to the driving wheel to drive its rotation.

[0030] In one embodiment, the transport hopper 026 includes an open-type particle receiving cavity; the inner wall of the open-type particle receiving cavity, and / or the outer wall of the transport hopper 026 is formed as a guide portion; on the second side of the circulation conveying mechanism 02, solid particles in the transport hopper 026 are guided by the inner wall of the open-type particle receiving cavity to the opening of the open-type particle receiving cavity, and then fall into the particle collection chamber 06 and / or fall onto the outer wall of the transport hopper below it and are guided by the outer wall of the transport hopper to the particle collection chamber 06.

[0031] Multiple conveying hoppers 026 are spaced apart on the circulating conveying mechanism 02, forming a continuous dynamic unit. When a conveying hopper 026 moves to the second side (descending section) of the circulating conveying mechanism 02, its spatial position forms a stepped arrangement with the adjacent conveying hoppers 026. At this time, solid particles discharged from the higher conveying hopper 026 will naturally roll onto the outer wall (inclined sidewall) of the adjacent lower conveying hopper 026, and then continue to slide towards the particle collection chamber through the outer wall of the lower conveying hopper. This relay flow guidance between the conveying hoppers 026 also avoids the risk of breakage caused by solid particles falling directly from a height.

[0032] Furthermore, in this embodiment, the transport hopper 026 is an inverted scoop type. The scoop type structure includes an open top for receiving particles, and perforated structures on the side walls and bottom plate for the passage and downward transfer of molten salt.

[0033] Molten salt flow can easily cause solid particles to break up, and the accumulation of debris can block the gaps between particles, which will further aggravate the problems of uneven flow and heat exchange. Based on this, in this embodiment, the pore size of the pore structure is smaller than the minimum particle size of the solid particles (the particle size of the solid particles is not uniform, and in practice it is generally determined according to the tracing parameters of the conventionally selected particle material). The broken particles are filtered through the pore structure on the side wall and the bottom plate and fall into the molten salt collection chamber 06.

[0034] Furthermore, the outlet end of the molten salt collection chamber 06 is provided with a molten salt outlet pipe 061, and the outlet end of the molten salt outlet pipe 061 is provided with a screen for blocking solid particles mixed in the molten salt. In one embodiment, the screen aperture is smaller than the minimum particle size of the solid particles (the particle size of solid particles is inconsistent, therefore, it is generally determined according to the traverse parameters of the conventionally selected particle feed). This screen is used to filter the crushed particles to ensure the consistency of particle size in the molten salt particle circulation system.

[0035] In one embodiment, the inner wall of the open-type particle receiving cavity is an arc-shaped inner wall. By setting the arc-shaped inner wall, it is ensured that the solid particles in the transport hopper 026 on the second side of the circulation conveying mechanism can slide smoothly from the transport hopper, avoiding the accumulation or blockage of solid particles in the guide section.

[0036] Furthermore, in this embodiment, the angle between the bottom wall and the side wall of the open particle receiving cavity is 15-60°. By designing the inclination angle within this range, the natural flow of particles is optimized, enabling the spontaneous detachment of solid particles while avoiding jamming.

[0037] Furthermore, the high-temperature corrosion of molten salt and particle friction lead to a short service life of the transport hopper 026. By coating the inner surface of the transport hopper 026 with an alumina wear-resistant coating, the high-temperature corrosion resistance and wear resistance are improved, thus extending the service life of the transport hopper 026.

[0038] In one embodiment, the central axis of the molten salt feeding port 032 coincides with the central axis of the transport hopper 026 on the first side of the circulation conveying mechanism 02. Molten salt is vertically injected into the hopper. The molten salt feeding port 032 is at a 90° angle to the horizontal plane. The specific location of the molten salt feeding port 032 is the top of the outer wall 01.

[0039] In one embodiment, a spray structure is provided at the molten salt inlet 032. This spray structure is configured to reciprocate along a motion track, thereby ensuring that the molten salt is evenly dispersed and injected into the transport hopper, ensuring that the particles are injected without dead corners and improving the initial contact uniformity between the molten salt and the particles. For example, the motion track can be a straight track, and the spray mechanism reciprocates along the track to achieve left-right reciprocating spraying. Alternatively, the motion track can be a mosquito coil-shaped track, and the spray structure reciprocates along this spiral trajectory, further avoiding overly dense central areas or sparse edges. In this embodiment, the spray structure includes a spray pipe and a spray head connected to it; the detailed structure is prior art and will not be described further. Furthermore, the spray structure can also adopt other existing spray structures. This invention emphasizes that it is configured to reciprocate along a motion track installed at the molten salt inlet 032 to ensure that the particles are injected without dead corners and improve the initial contact uniformity between the molten salt and the particles.

[0040] In this embodiment, a particle feeding port 031 is provided on the outer wall 01, located below the heat exchange chamber 03. Preferably, the particle feeding port 031 is at an angle of 15-60° to the horizontal plane.

[0041] Furthermore, a detection module is provided at the outlet of the pellet feed port 031, and the detection module is configured as follows: When the transport hopper 026 is detected to have moved to the area corresponding to the pellet feed port 031, the pellet feed port 031 is controlled to open. When the transport hopper 026 is detected to have moved out of the area corresponding to the particle feeding port 031, the particle feeding port 031 is controlled to close.

[0042] Preferably, the detection module provided below the particle feeding port 031 can be a distance detection device. When the distance signal suddenly increases, the transport hopper 026 is detected, and the particle feeding port 031 is controlled to close to stop feeding; when the distance signal remains unchanged, the particle feeding port 031 is controlled to open to feed.

[0043] In one embodiment, the particle collection chamber 05 adopts an open design, with the upper opening set at a height between 1 / n and 3 / n from the top of the device frame, where n is the number of hoppers on one side when the lifting system is running. The lower bottom surface is connected to the particle discharge port 051 and forms an angle of 15-60° with the horizontal plane.

[0044] In one embodiment, the particle collection chamber 05 is provided with a particle outlet pipe at its outlet end, and the particle outlet pipe forms an angle of 15-60° with the horizontal plane.

[0045] This embodiment also provides a bucket elevator-type molten salt solid storage heat exchange system, including the aforementioned bucket elevator-type molten salt solid storage heat exchange device 1, molten salt pump 2, pipeline, and heat exchange equipment 4. In the bucket elevator-type molten salt solid storage heat exchange device 1, the outlet end of the molten salt collection chamber 06 is connected to the heat exchange equipment 4 through the molten salt pump 2 and pipeline, and the heat exchange equipment 4 is connected to the molten salt distribution port 032.

[0046] In this embodiment, the heat storage process of the bucket elevator-type molten salt solid storage heat exchanger system 1 is as follows: The motor rotates, driving the conveyor chain 025 to rotate, and the conveyor hopper 026 in the heat exchange chamber 03 rises; the particle feeding port 031 is opened, and cold particles are injected into the conveyor hopper 026 through the pipe. At the same time, the top molten salt distribution port 032 is opened, and the high-temperature molten salt falls and exchanges heat with the cold particles in the conveyor hopper 026. The hotter molten salt after heat exchange flows out through the hole plate at the bottom of the conveyor hopper 026 and exchanges heat with the cold particles in the next conveyor hopper 026. The particles undergo heat exchange, and the resulting cold salt falls into the molten salt collection chamber 06 after sufficient heat exchange. It is then sent to the heat exchange equipment 4 through the molten salt outlet pipe 061 to obtain excess energy from the outside. The particles, which are fully heated in the heat exchange chamber 03, enter the separation chamber 04 through the conveyor chain. The particles roll down to the bottom of the previous conveyor hopper 026 and then roll down the slope of the guide section to the particle collection chamber 05. The crushed particles in the hopper are filtered by the perforated plate and fall into the molten salt collection chamber 06, completing the separation and collection of molten salt and solid particles.

[0047] In this embodiment, the heat release process of the bucket elevator molten salt solid storage heat exchange device 1 is as follows: the motor rotates, driving the conveyor chain 025 to rotate, and the conveyor hopper 026 in the heat exchange chamber 03 rises. Open the particle feeding port 031, and hot particles are injected into the conveying hopper 026 through the pipe. At the same time, the top molten salt distribution port 032 is opened, and low-temperature molten salt falls and exchanges heat with the hot particles in the conveying hopper 026. The cooled molten salt after heat exchange flows out through the perforated plate at the bottom of the conveying hopper 026 and exchanges heat with the hot particles in the next conveying hopper 026. Finally, the hot salt obtained after sufficient heat exchange falls into the molten salt collection chamber 06 and is sent to the heat exchange equipment 4 through the molten salt outlet pipe 061 to provide energy to the outside. After being fully cooled in the heat exchange chamber 03, the particles enter the separation chamber 04 through the conveying chain 025. The particles roll down to the bottom of the previous conveying hopper 026 and roll down the slope to the particle collection chamber 05. The broken particles in the hopper are filtered by the perforated plate and fall into the molten salt collection chamber 06, completing the separation and collection of molten salt and solid particles.

[0048] In the prior art, the thermal storage capacity of the fixed bed structure is fixed and cannot be flexibly adjusted according to the grid load. It requires a large-scale tank system to match the capacity demand, resulting in high equipment redundancy and a significant increase in construction costs. Therefore, in this embodiment, the bucket elevator molten salt solid storage heat exchange device 1 system also includes a control system. The control system adjusts the power of the drive mechanism and the flow rate of the molten salt distribution port 032 according to the target heat exchange. During the heat storage and release process, the temperature of the particles and molten salt after a complete heat exchange can be controlled by controlling the motor output power and the molten salt inlet flow rate. That is, the temperature change value after the particles (molten salt) are lifted (fall) from the bottom (top) to the top (bottom) is provided to the outside.

[0049] Furthermore, during the storage and release of heat, the particles in the particle collection chamber 05 can be transferred to the particle inlet via particle tank trucks for multiple heating processes.

[0050] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A bucket elevator-type molten salt solid storage heat exchange device, characterized in that, include: The outer wall encloses and forms a closed space; A cyclic transmission mechanism, located within the enclosed space, is configured to cyclically move in the vertical direction under the drive of a drive mechanism. A transport hopper, wherein multiple transport hoppers are spaced apart on the circulating conveying mechanism, and the outer wall of the transport hopper is provided with a perforated structure that allows molten salt to pass through and blocks solid particles from passing through; A heat exchange chamber is located on the first side of the circulating conveying mechanism. The first side is the path segment through which the conveying hopper moves vertically upward. The outer wall is provided with a molten salt feeding port and a particle feeding port that communicate with the heat exchange chamber. The molten salt feeding port is located above the first side, and the particle feeding port is located below the heat exchange chamber. The particle collection chamber is located on the second side of the circulating conveying mechanism, and the second side is the path segment through which the conveying hopper moves downward in the vertical direction; A molten salt collection chamber is located within the enclosed space and below the circulating transport mechanism; Molten salt enters the heat exchange chamber through the molten salt feeding port, passes through the conveying hopper on the first side of the circulation conveying mechanism from top to bottom, and then collects in the molten salt collection chamber; solid particles are injected into the conveying hopper on the first side of the circulation conveying mechanism through the particle feeding port, and then rise with the conveying hopper through the circulation. During the rise, they dynamically contact and exchange heat with the molten salt, and are then transported to the second side of the circulation conveying mechanism, where they are guided by the guide section and collected in the particle collection chamber.

2. The bucket elevator type molten salt solid storage heat exchanger according to claim 1, characterized in that, The transport hopper includes an open-type particle receiving cavity; The inner wall of the open-type particle receiving cavity, and / or the outer wall of the conveying hopper, are formed as the flow guide; On the second side of the circulating conveying mechanism, solid particles in the conveying hopper are guided by the inner wall of the open-type particle receiving cavity to the opening of the open-type particle receiving cavity, and then fall into the particle collection chamber and / or fall onto the outer wall of the conveying hopper below it and are guided by the outer wall of the conveying hopper to the particle collection chamber.

3. The bucket elevator type molten salt solid storage heat exchanger according to claim 2, characterized in that, The outlet end of the molten salt collection chamber is equipped with a screen to block solid particles mixed in the molten salt.

4. The bucket elevator type molten salt solid storage heat exchanger according to claim 2, characterized in that, The inner wall of the open-type particle-containing cavity is an arc-shaped inner wall.

5. The bucket elevator type molten salt solid storage heat exchanger according to claim 1, characterized in that, The central axis of the molten salt feed inlet coincides with the central axis of the transport hopper on the first side of the circulating transport mechanism.

6. The bucket elevator type molten salt solid storage heat exchanger according to claim 1, characterized in that, The molten salt feeding port is equipped with a spray structure, which is configured to reciprocate along a motion track to uniformly disperse the molten salt particles into the transport hopper.

7. The bucket elevator type molten salt solid storage heat exchanger according to claim 1, characterized in that, A detection module is provided at the outlet of the granule feed port, and the detection module is configured to: When the transport hopper is detected to have moved to the area corresponding to the particle feeding port, the particle feeding port is controlled to open. When the transport hopper is detected to have moved out of the area corresponding to the particle feeding port, the particle feeding port is controlled to close.

8. The bucket elevator type molten salt solid storage heat exchanger according to claim 1, characterized in that, The particle collection chamber is equipped with a particle outlet pipe at its outlet end, and the particle outlet pipe forms an angle of 15-60° with the horizontal plane.

9. A bucket elevator-type molten salt solid storage heat exchange system, characterized in that, Includes the bucket elevator type molten salt solid storage heat exchange device as described in any one of claims 1-8.

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