Sand particle heating device and sand particle heating system

Abstract

The application provides a sand particle heating device and a sand particle heating system, and relates to the technical field of heating and heat storage systems. The device comprises a shell, a medium passage plate, a zero electrode, a phase electrode assembly and a power adjusting assembly. The medium passage plate is connected to the upper part of the shell, the zero electrode is connected to the bottom of the medium passage plate, one end of the phase electrode assembly is located in the annular space between the shell and the zero electrode, and the other end of the phase electrode assembly is located outside the shell after passing through the shell. The power adjusting assembly comprises a power adjusting tube, the top end of the power adjusting tube is located in the annular space formed by the zero electrode, the power adjusting tube can move relatively in the vertical direction, and the sand particle medium above the top end of the power adjusting tube can flow into the lower part of the shell from the top end of the power adjusting tube through the power adjusting tube. The electrode heating mode is more conducive to high-voltage heating work, can save the investment of the power distribution system while realizing high-power heating, can reduce the loss in the process of power transformation and distribution, and can improve energy efficiency.

Description

Technical Field

[0001] This invention relates to the field of heating and heat storage systems, and in particular to a sand heating device and a sand heating system. Background Technology

[0002] To meet the needs of carbon neutrality, the proportion of renewable energy sources such as wind, solar, and hydropower will continue to increase in the future. However, a fundamental characteristic of this type of renewable energy power generation is its unstable and highly volatile output. This shift in the future power grid necessitates advanced energy storage technologies. While various types of energy storage technologies exist, they all have certain limitations that restrict their application.

[0003] For example, hydrothermal storage is currently widely used in low-temperature heating scenarios. Its basic working logic is to convert electrical energy into heat energy and store it during off-peak electricity demand periods. Then, during peak electricity demand periods, the stored heat is released to supply users, thus achieving peak shaving and valley filling of electricity consumption. However, this is a relatively inefficient energy storage application because it converts high-grade electrical energy into low-grade heat. From an energy efficiency perspective, this is not a good energy storage application. Another significant problem is the low heat storage density of hydrothermal storage, meaning the amount of heat stored per unit mass or volume of the storage medium is relatively low.

[0004] Later, sand-based thermal storage technology emerged on the market. This technology uses inexpensive, electrically conductive, and easily circulated fine sand particles to store heat. The main characteristics of this technology are: high storage temperature; good thermophysical and mechanical properties at high storage temperatures, meeting the requirements for high-temperature thermal storage; and significantly increased heat storage density compared to conventional thermal storage technologies. Furthermore, the cost of the medium material is relatively low due to the ease of obtaining the materials.

[0005] The applicant has discovered at least the following technical problems in the prior art: In the existing sand storage technology, only resistance wire elements can be used to heat the sand to store heat. However, the maximum power of the current resistance element heating is about 2800MW, and it is basically powered by 380V power supply, which leads to high investment in the power distribution system. In addition, the failure rate of the resistance heating element is high.

[0006] In addition, the power of existing heating devices requires the cooperation of external power adjustment devices, the adjustment process is relatively cumbersome, the requirements for external systems are high, and the cost is increased. Summary of the Invention

[0007] The purpose of this invention is to provide a sand heating device and system to solve the technical problems of high cost and high failure rate of resistance heating elements in existing technologies. The preferred technical solutions provided by this invention offer numerous technical advantages, which are detailed below.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A sand heating device includes a housing, a medium channel plate, a zero electrode, a phase electrode assembly, and a power adjustment assembly. The medium channel plate is connected to the upper part inside the housing, and the zero electrode is connected to the bottom of the medium channel plate. One end of the phase electrode assembly is located in the annular space between the housing and the zero electrode, and the other end extends out of the housing and is located outside the housing. The power adjustment assembly includes a power adjustment tube, the top end of which is located in the annular space formed by the zero electrode. The power adjustment tube is vertically movable, and sand medium above the top end of the power adjustment tube can flow from the top end of the power adjustment tube into the lower part inside the housing.

[0010] Preferably, the housing includes an upper outer shell, a lower outer shell, a partition flange, and a sleeve. The upper outer shell and the lower outer shell are both connected to the partition flange. The top of the sleeve is connected to the lower part of the partition flange. The power regulating pipe passes through the sleeve and can move up and down relative to the sleeve.

[0011] Preferably, the upper part of the upper shell is an umbrella-shaped structure, the upper part of the medium channel plate is an umbrella-shaped structure and is parallel to the corresponding upper shell, and the lower part of the medium channel plate has a plurality of medium distribution holes evenly distributed.

[0012] Preferably, the number of phase electrode assemblies is an integer multiple of 3, and all the phase electrode assemblies are evenly distributed in the circumferential direction. Each phase electrode assembly includes an electrode body, an insulating tube, and a terminal connected in sequence from bottom to top. The electrode body can contact the sand medium, and the insulating tube passes through the upper outer shell.

[0013] Preferably, the power regulation assembly further includes a drive structure, a transmission shaft, and a connecting structure, wherein the drive structure is drivenly connected to the transmission shaft, the transmission shaft is drivenly connected to the connecting structure, and the connecting structure is drivenly connected to the power regulation tube.

[0014] Preferably, it further includes a ventilation assembly, the ventilation assembly including a first ventilation duct, the bottom end of the first ventilation duct being connected to the upper part of the housing.

[0015] Preferably, the ventilation assembly further includes a second ventilation duct, an air intake fan, and a gas sensor. The bottom end of the second ventilation duct is connected to the upper part of the housing, the air intake fan is connected to the top end of the second ventilation duct, and the gas sensor is disposed at the top end of the first ventilation duct.

[0016] Preferably, it also includes a junction box, all of which are located inside the junction box. The junction box is provided with an air inlet and an air outlet, both of which are connected to an external cooling device.

[0017] A sand heating system includes a circulation pipeline, a regulating valve, and the aforementioned sand heating device. The sand heating device is connected to a heat storage device or a heat user through the circulation pipeline, and the regulating valve is installed on the circulation pipeline.

[0018] Preferably, it also includes a sand circulation device, which is installed on the circulation pipeline.

[0019] The beneficial effects of the present invention are as follows: by setting an umbrella-shaped medium channel, the umbrella structure can make the sand medium flow from the outermost side into the upper space of the sand heating device, and make the flow more uniform. Through the uniform flow of the sand medium, the depth or surface area of ​​each phase electrode assembly buried in the sand medium can be as close as possible, thereby making the three-phase current of the phase electrode assembly balanced during operation.

[0020] The heating power of the sand heating device can be adjusted by adjusting the height of the power regulating tube. The power regulating component allows the power adjustment to be completed inside the sand heating device, eliminating the need for an external power regulating device. The regulating device is simple, low-cost, and the adjustment process is simple and convenient, which also reduces the requirements for external systems.

[0021] By using electrode heating, high-voltage heating is easier to achieve compared to conventional resistance element heating. This makes it easier to achieve high-power heating and also saves on investment in the power distribution system, because higher voltage means lower current, which can reduce losses in the power distribution process and thus improve energy efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a structural diagram of Embodiment 1 of the invention;

[0024] Figure 2 This is a structural diagram of Embodiment 3 of the invention. The sand heating device in the diagram is simplified for ease of demonstration; the actual structural form of the sand heating device adopts... Figure 1 The structural form in;

[0025] Figure 3 This is a structural diagram of Embodiment 4 of the invention. The sand heating device in the diagram is simplified for ease of demonstration; the actual structural form of the sand heating device adopts... Figure 1 The structural form in;

[0026] In the diagram: 1. Shell; 11. Upper outer shell; 111. Medium inlet; 12. Lower outer shell; 121. Medium outlet; 13. Separating flange; 14. Sleeve;

[0027] 2. Medium channel plate; 21. Medium distribution hole;

[0028] 3. Zero electrode;

[0029] 4. Phase electrode assembly; 41. Electrode body; 42. Insulating tube; 43. Wiring terminal; 44. Junction box; 45. Air inlet; 46. Air outlet;

[0030] 5. Power regulation assembly; 51. Power regulation tube; 52. Drive structure; 53. Drive shaft; 54. Connection structure;

[0031] 6. Ventilation components; 61. First ventilation duct; 62. Second ventilation duct; 63. Air intake fan; 64. Gas sensor

[0032] 7. Control valve;

[0033] 8. Heat storage device;

[0034] 9. Sand recycling device. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0036] In the description of this invention, it should be understood that the terms "center," "side," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicate the orientation or positional relationship based on the appendix. Figure 1The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0037] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] Example 1

[0039] Reference Figure 1 The present invention provides a sand heating device, comprising a housing 1, a medium channel plate 2, a zero electrode 3, a phase electrode assembly 4, and a power adjustment assembly 5;

[0040] The housing 1 includes an upper outer shell 11, a lower outer shell 12, a partition flange 13, and a sleeve 14. Both the upper outer shell 11 and the lower outer shell 12 are connected to the partition flange 13, forming an upper space between the upper outer shell 11 and the partition flange 13, and forming a lower space between the lower outer shell 12 and the partition flange 13. The top of the sleeve 14 is connected to the lower part of the partition flange 13, and the axis of the sleeve 14 is aligned with the axes of the upper outer shell 11 and the lower outer shell 12.

[0041] The top of the upper outer shell 11 is provided with a medium inlet 111. The upper part of the upper outer shell 11 is preferably an umbrella-shaped structure. The medium channel plate 2 is connected to the upper part inside the shell 1. The upper part of the medium channel plate 2 is an umbrella-shaped structure and is parallel to the corresponding upper outer shell 11. The lower part of the medium channel plate 2 is evenly distributed with a number of medium distribution holes 21. The upper part of the upper outer shell 11 and the medium channel plate 2 form part of the medium flow channel. The sand medium enters the medium flow channel from the medium inlet 111 and flows downward evenly from the medium distribution holes 21. The umbrella-shaped structure enables the sand medium to flow into the upper space from the outermost side and makes the flow more uniform. Through the uniform flow of the sand medium, the depth or surface area of ​​each phase electrode assembly 4 buried in the sand medium can be made as close as possible, so that the three-phase current of the phase electrode assembly 4 is balanced during operation.

[0042] The bottom of the lower outer shell 12 is provided with a medium outlet 121. The lower part of the lower outer shell 12 is preferably a conical structure with its tip pointing downward and converging towards the medium outlet 121, which can further enhance the flow performance of sand particles, enhance the organized flow of sand particles, prevent sand particles from stagnating at the corners, and reduce the requirements for the flow performance of sand particles.

[0043] The zero electrode 3 is preferably a cylindrical structure. The zero electrode 3 is connected to the bottom of the medium channel plate 2. A gap is left between the lower part of the zero electrode 3, the partition flange 13 and the upper shell 11, thereby forming part of the medium flow channel.

[0044] One end of the phase electrode assembly 4 is located in the annular space between the housing 1 and the zero electrode 3, and the other end extends out of the housing 1 and is located outside the housing 1. The bottom end of the phase electrode assembly 4 can be embedded in the sand medium.

[0045] The power regulation assembly 5 includes a power regulation tube 51. The top end of the power regulation tube 51 is located in the annular space formed by the zero electrode 3. The power regulation tube 51 passes through the sleeve 14 and can move up and down relative to the sleeve 14 along the axis of the sleeve 14. The sand particles above the top end of the power regulation tube 51 can flow from the top end of the power regulation tube 51 into the lower part of the housing 1. The installation structure of the sleeve 14 can make the up and down movement of the power regulation tube 51 smooth and ensure the direction of movement. In addition, an appropriate gap can be maintained between the sleeve 14 and the power regulation tube 51 to avoid the jamming of the power regulation tube 51. During equipment maintenance, all the sand particles in the upper space can flow into the lower space and out of the entire device.

[0046] The sand medium mentioned in this embodiment is preferably a fine sand material with necessary low conductivity, certain flowability and high temperature resistance. Currently, there are already fine sand media with good flowability and high heat resistance on the market, which are suitable for the application of the sand heating device mentioned in this embodiment. The sand medium enters from the medium inlet 111 at the top of the upper shell 11, flows downward along the umbrella-shaped medium channel between the upper shell 11 and the medium channel plate 2, and reaches the upper space after passing through the medium distribution hole 21. The sand medium entering the upper space comes into contact with the zero electrode 3 and the phase electrode assembly 4. After the phase electrode assembly 4 is connected to the external power supply, current will be generated in the sand medium. Since the sand medium has high resistance, the sand medium itself will generate a large amount of heat, heating itself up. The heated sand medium flows to the inner side of the annular space of the zero electrode 3 and enters the power regulating tube 51. It flows along the power regulating tube 51 to the lower space and finally flows out from the medium outlet 121.

[0047] The heating power of the sand heating device can also be adjusted by adjusting the height of the power regulating tube 51. When the position of the power regulating tube 51 is lowered, the position of the upper surface of the sand medium in the upper space is lowered, and the depth of the phase electrode assembly 4 buried in the sand medium is reduced. Therefore, the heating power is reduced accordingly until the position of the power regulating tube 51 is lowered to the minimum, and the heating power is also reduced to the minimum. Conversely, when the position of the power regulating tube 51 is raised, the position of the upper surface of the sand medium is raised, and the depth of the phase electrode assembly 4 buried in the sand medium is increased. Therefore, the heating power is raised accordingly until the power regulating tube reaches the highest position, and the heating power reaches the maximum. In addition, when the position of the power regulating tube 51 is lowered below the lowest position of the phase electrode assembly 4, the phase electrode assembly 4 will no longer be in contact with the sand medium. At this time, the heating power is reduced to zero.

[0048] The power adjustment component 5 enables power adjustment to be completed inside the sand heating device, eliminating the need for an external power adjustment device. The adjustment device is simple, low-cost, and the adjustment process is also simple and convenient, reducing the requirements for external systems.

[0049] Compared with conventional resistance element heating, electrode heating makes it easier to achieve high-voltage heating. This not only facilitates high-power heating but also saves on investment in the power distribution system, as higher voltage results in lower current and reduces losses during power distribution, thus improving energy efficiency. Electrode heating allows for the use of 10kV power supplies and also highlights the small size and high efficiency of the sand heating device.

[0050] As an optional implementation, the number of phase electrode assemblies 4 is preferably an integer multiple of 3, and can be 3, 6, 9 or more, so that it can be consistent with the number of phases of the three-phase power supply, so that the three-phase current is kept balanced when the sand heating device is working.

[0051] All phase electrode assemblies 4 are evenly distributed in the circumferential direction in the annular space between the zero electrode 3 and the upper outer shell 11 to facilitate the balance of three-phase currents;

[0052] Each phase electrode assembly 4 includes an electrode body 41, an insulating tube 42, and a terminal block 43 connected sequentially from bottom to top. The electrode body 41 can contact the sand medium, and the insulating tube 42 passes through the upper outer shell 11.

[0053] As an optional implementation, the power adjustment assembly 5 further includes a drive structure 52, a transmission shaft 53, and a connecting structure 54. The drive structure 52 is preferably a combination of a drive motor and a reducer. The drive structure 52 is connected to the transmission shaft 53, and the transmission shaft 53 is connected to the connecting structure 54. The connecting structure 54 is preferably a hoisting transmission mechanism, a chain transmission unit, or other transmission mechanism. The connecting structure 54 is connected to the power adjustment tube 51. After the drive structure 52 is started, it can drive the transmission shaft 53 to rotate. The rotation of the transmission shaft 53 can drive the connecting structure 54 to drive the power adjustment tube 51 to move up and down in the vertical direction.

[0054] The power adjustment component 5 can adjust the height of the power adjustment tube 51 according to the control information from the outside, thereby adjusting the heating power of the sand heating device;

[0055] When the position of the power regulating tube 51 is lowered, the position of the upper surface of the sand medium is lowered, and the depth of the electrode body 41 embedded in the sand medium is reduced. Therefore, the heating power is reduced accordingly until the position of the power regulating tube 51 is lowered to the minimum, and the heating power is also reduced to the minimum.

[0056] Conversely, when the position of the power regulating tube 51 is raised, the position of the upper surface of the sand medium is raised, and the depth of the electrode body 41 embedded in the sand medium increases. Therefore, the heating power increases accordingly until the power regulating tube reaches the highest position and the heating power reaches the maximum.

[0057] In addition, when the position of the power regulating tube 51 drops below the lowest position of the electrode body 41, the phase electrode assembly 4 will no longer be in contact with the sand medium, and at this time, the heating power is reduced to zero.

[0058] The power adjustment component 5 enables power adjustment to be completed inside the sand heating device, eliminating the need for an external power adjustment device. The adjustment device is simple, low-cost, and the adjustment process is also simple and convenient, reducing the requirements for external systems.

[0059] Example 2

[0060] Reference Figures 1 to 3 Based on the above embodiments, as an optional implementation, in order to ensure that the inside of the sand heating device is always kept at normal pressure, this embodiment preferably provides a vent at the top of the shell 1 so that it can always be connected to the atmosphere to maintain normal pressure. Since the sand does not cause an increase in system pressure during the entire working process, the system is always a normal pressure system, thereby avoiding problems related to system pressure safety.

[0061] In some cases, such as when the sand heating device is full of sand, the sand can overflow from the vent. To avoid this, the sand heating device also includes a ventilation component 6, which includes a first ventilation pipe 61. The bottom end of the first ventilation pipe 61 is connected to the vent and communicates with the upper part of the housing 1. That is, a first ventilation pipe 61 is led from the vent to a higher position. The top end of the first ventilation pipe 61 is preferably higher than the highest sand level of the system, thereby effectively preventing sand from overflowing.

[0062] As an optional implementation, since sand particles generate tiny dust particles due to friction during movement, which fill the upper space of the sand particle heating device and cause safety issues such as electrode contamination, in this embodiment, the number of vents is preferably set to two, one for air intake and the other for exhaust. In this way, the dust that may be generated inside the heating device can be discharged in time, reducing installation risks. Thus, the ventilation component 6 also includes a second ventilation pipe 62. The bottom end of the second ventilation pipe 62 is connected to the vent and communicates with the upper part of the housing 1. The first ventilation pipe 61 and the second ventilation pipe 62 cooperate with each other, with the second ventilation pipe 62 used as an air intake pipe and the first ventilation pipe 61 used as an exhaust pipe.

[0063] The ventilation assembly 6 also includes an air intake fan 63 and a gas sensor 64. The air intake fan 63 is connected to the top of the second ventilation pipe 62. The air intake fan 63 can draw room temperature air from the environment and send it into the upper space of the sand heating device to replace the dust-containing gas inside the sand heating device with the outside atmosphere.

[0064] Gas sensor 64 is installed at the top of the first ventilation duct 61. Gas sensor 64 can detect dust concentration and related gas content. The air intake fan 63 can control the air volume according to the signal of gas sensor 64, thereby reducing energy consumption.

[0065] As an optional implementation, since the sand heating device mentioned in this embodiment is a high-temperature heating device, the high temperature inside the sand heating device will inevitably be transferred to the terminal 43 through the electrode body 41, resulting in extremely high temperature at the terminal 43. This places higher demands on the relevant components of the wiring connection, requiring the selection of high-temperature resistant materials or components, further increasing costs and even increasing the economic infeasibility during the technical implementation process. Therefore, the sand heating device also preferably includes a junction box 44, with all the terminal 43 located inside the junction box 44. The junction box 44 is equipped with an inlet... Air inlets 45 and 46 are connected to external cooling equipment. Once connected, the external cooling equipment can provide active cooling for the inside of junction box 44, reducing the temperature inside the junction box 44 to the desired temperature. This can be achieved by reducing the airflow temperature or increasing the airflow rate. Junction box 44 reduces the requirements for materials and components in the connection parts, thus reducing costs. The placement of air inlets 45 and 46 facilitates the installation of external cooling devices and even heat recovery. The heat from the hot air flowing out of air outlet 46 can be recovered using an external heat recovery device.

[0066] As an alternative implementation, a sand level sensor can preferably be installed on the outside of the sand heating device to measure the sand depth inside the sand heating device, and the sand level signal of the sand level sensor can be used to assist in the control of the heating power during operation.

[0067] Example 3

[0068] Reference Figure 1 and Figure 2 The present invention also mentions a sand heating system, including a circulation pipeline, a regulating valve 7, the aforementioned sand heating device, and a heat storage device 8.

[0069] The sand heating device can be connected to the heat storage device 8 through a circulation pipeline. The heat storage device 8 is made of high-temperature resistant material and has an external heat insulation structure. When used together with the sand heating device, it can achieve the functions of heating and heat storage.

[0070] When the sand heating device is connected to the heat storage device 8 through the circulation pipeline, the sand flows in from the top of the sand heating device and flows out from the bottom of the sand heating device. If the lowest sand level in the heat storage device 8 is set higher than the inlet position of the sand heating device and the height difference between the two can overcome the resistance of the sand flow process in the pipeline between the heat storage device 8 and the sand heating device, the sand can make full use of its gravity to achieve the flow from top to bottom, simplifying the structure of the circulation system.

[0071] If normal flow cannot be achieved by gravity, the sand heating system also includes a sand circulation device 9. The sand circulation device 9 is installed on the circulation pipeline. The sand circulation device 9 draws sand from the bottom of the sand heating device and sends it to the upper part of the heat storage device 8. The sand circulation device is preferably a pump with high temperature resistance and good wear resistance or other types of devices that can drive the sand to move in the pipeline. The sand circulation device 9 can ensure that the minimum sand level of the heat storage device 8 does not have to be higher than the inlet position requirement of the sand heating device, providing more installation flexibility and design flexibility.

[0072] In addition, the lower part of the heat storage device 8 is designed similarly to the sand heating device, also in the form of a cone shape that tapers downwards and towards the middle. The sand outlet of the heat storage device 8 is located at the bottom, at the position where the taper is minimized. This helps to reduce the requirements for sand flowability, reduce the manufacturing cost of sand, provide more choices of sand types, and also helps to improve the volumetric efficiency of the heat storage device 8, so that as many sand particles as possible can participate in heat storage and heat release.

[0073] To achieve high-temperature heat storage, the outer shells of both the sand heating device and the heat storage device 8 can be made of high-temperature resistant materials such as ceramics, so that the heat storage temperature can be increased to 1400℃ or higher.

[0074] The regulating valve 7 is installed on the circulation pipeline. The regulating valve 7 can adjust the heating power of the sand heating device by controlling its flow area. When it is necessary to increase the heating power, the opening of the regulating valve 7 can be increased to raise the sand level in the sand heating device. When it is necessary to reduce the heating power, the opening of the regulating valve 7 can be decreased to lower the sand level in the sand heating device.

[0075] Example 4

[0076] Reference Figure 1 and Figure 3 The present invention also mentions a sand heating system, including a circulation pipeline, a regulating valve 7, the aforementioned sand heating device and sand circulation device 9.

[0077] The sand heating device can also be directly connected to the heat user through the circulation pipeline, and there is no need to include a separate heat storage device 8. It is only necessary to make the container volume of the sand heating device large enough so that the heat storage device 8 and the sand heating device are combined into one, so that the sand container can be used as both a heat storage container and a heating container.

[0078] In practical applications, when the container is made large enough, and a sufficient number or size of electrodes are appropriately arranged inside the container to balance the current of each phase electrode within the error range, it is sufficient to avoid the three-phase current deviation or imbalance exceeding the standard range. When storing heat, the power supply is turned on, and when heat needs to be released, the sand circulation device 9 is turned on.

[0079] Using this technical solution, it is only necessary to enlarge the sand container to increase the distance between the electrodes, and to make appropriate design calculations and manufacturing of the electrode dimensions. This technical solution can be applied to power supplies with voltages exceeding high voltage, such as directly using 110kV or higher voltage, without the need to install high-voltage / low-voltage transformers, which significantly saves on power distribution costs and reduces the investment in the entire thermal storage system.

[0080] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A sand heating device, characterized in that, The device includes a housing (1), a dielectric channel plate (2), a zero electrode (3), a phase electrode assembly (4), and a power adjustment assembly (5), wherein: the dielectric channel plate (2) is connected to the upper part inside the housing (1), the zero electrode (3) is connected to the bottom of the dielectric channel plate (2), one end of the phase electrode assembly (4) is located in the annular space between the housing (1) and the zero electrode (3), and the other end extends out of the housing (1) and is located outside the housing (1), the power adjustment assembly (5) includes a power adjustment tube (51), the top end of the power adjustment tube (51) is located in the annular space formed by the zero electrode (3), the power adjustment tube (51) is capable of moving relative to the zero electrode (3) in the vertical direction, and sand particles above the top end of the power adjustment tube (51) can flow from the top end of the power adjustment tube (51) through the power adjustment tube (51) into the lower part inside the housing (1).

2. The sand heating device according to claim 1, characterized in that: The housing (1) includes an upper outer shell (11), a lower outer shell (12), a partition flange (13), and a sleeve (14). The upper outer shell (11) and the lower outer shell (12) are both connected to the partition flange (13). The top of the sleeve (14) is connected to the lower part of the partition flange (13). The power regulating pipe (51) passes through the sleeve (14) and can move up and down relative to the sleeve (14).

3. The sand heating device according to claim 2, characterized in that: The upper part of the upper shell (11) has an umbrella-shaped structure, the upper part of the medium channel plate (2) has an umbrella-shaped structure and is parallel to the corresponding upper shell (11), and the lower part of the medium channel plate (2) has a number of medium distribution holes (21) evenly distributed.

4. The sand heating device according to claim 2, characterized in that: The number of phase electrode assemblies (4) is an integer multiple of 3. All phase electrode assemblies (4) are evenly distributed in the circumferential direction. Each phase electrode assembly (4) includes an electrode body (41), an insulating tube (42), and a terminal block (43) connected sequentially from bottom to top. The electrode body (41) can contact the sand medium. The insulating tube (42) passes through the upper outer shell (11).

5. The sand heating device according to claim 1, characterized in that: The power regulation component (5) further includes a drive structure (52), a transmission shaft (53), and a connection structure (54). The drive structure (52) is connected to the transmission shaft (53), the transmission shaft (53) is connected to the connection structure (54), and the connection structure (54) is connected to the power regulation tube (51).

6. The sand heating device according to claim 1, characterized in that: It also includes a ventilation assembly (6), which includes a first ventilation pipe (61) whose bottom end is connected to the upper part of the housing (1).

7. The sand heating device according to claim 6, characterized in that: The ventilation assembly (6) further includes a second ventilation pipe (62), an air intake fan (63), and a gas sensor (64). The bottom end of the second ventilation pipe (62) is connected to the upper part of the housing (1), the air intake fan (63) is connected to the top end of the second ventilation pipe (62), and the gas sensor (64) is located at the top end of the first ventilation pipe (61).

8. The sand heating device according to claim 4, characterized in that: It also includes a junction box (44), all of the terminals (43) are located inside the junction box (44), and the junction box (44) is provided with an air inlet (45) and an air outlet (46), both of which are connected to external cooling equipment.

9. A sand heating system, characterized in that, It includes a circulation pipeline, a regulating valve (7), and a sand heating device according to any one of claims 1-8. The sand heating device is connected to a heat storage device (8) or a heat user through the circulation pipeline, and the regulating valve (7) is installed on the circulation pipeline.

10. The sand heating system according to claim 9, characterized in that: It also includes a sand circulation device (9), which is installed on the circulation pipeline.

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