High-voltage silicon sand heat exchange system

Abstract

The application discloses a high-voltage silicon sand heat exchange system. The heat exchange system comprises a circulating conveying device, a heating device, a heat storage box and a heat exchange device. The circulating conveying device is used for circulating and conveying silicon sand and is provided with a discharge port and a feeding port. The heating device comprises a heating box, resin protection wires and a heating assembly. The internal space of the heating box is communicated with the discharge port. The heating assembly comprises a plurality of heating modules. Each heating module is provided with a heating part and a connecting part. The heating part extends into the heating box. Each heating module is arranged in multiple rows and multiple columns. The heating modules in each row are connected in series through the resin protection wires. The heating modules in each column are connected in parallel through the resin protection wires. The heat storage box is communicated with the heating box and can receive the silicon sand heated by the heating device. The heat storage box is also communicated with the feeding port. The heat exchange device is contacted with the heat storage box and is used for exchanging heat with the heat storage box and the silicon sand in the heat storage box. The application solves the technical problem of poor applicability of the existing heat exchange system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange, in particular to a high-voltage silicon sand heat exchange system. BACKGROUND

[0002] The heat exchange system refers to a system for storing heat by heating a heat exchange medium and then exchanging heat with other medium. Currently, molten salt is commonly used as a heat exchange medium. However, among common molten salts, fluorides have high cost, poor thermal stability of materials and toxicity; chlorides have high corrosiveness; carbonates have high viscosity and easy decomposability; and most of the molten salts have low temperature range of use, which is not conducive to direct high-voltage access, and transformers are needed to increase cost and poor applicability. Therefore, it is necessary to propose a new heat exchange system to solve the above problems. SUMMARY

[0003] Therefore, the present application provides a high-voltage silicon sand heat exchange system to solve the technical problem of poor applicability of the existing heat exchange system.

[0004] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0005] A high-voltage silicon sand heat exchange system, the heat exchange system comprises:

[0006] A circulating conveying device for circulating and conveying silicon sand, the circulating conveying device has a discharge port and a feeding port;

[0007] A heating device comprising a heating box, a resin protection wire and a heating assembly, the internal space of the heating box is in communication with the discharge port, the heating assembly comprises a plurality of heating modules, each of the heating modules has a heating part and a connecting part, the heating part extends into the heating box, the connecting part is electrically connected with the heating part and extends out of the heating box, each of the heating modules is arranged in multiple rows and multiple columns, the heating modules in each row are connected in series through the resin protection wire, and the heating modules in each column are connected in parallel through the resin protection wire;

[0008] A heat storage box in communication with the heating box to receive the silicon sand heated by the heating device, the heat storage box is also in communication with the feeding port;

[0009] And a heat exchange device in contact with the heat storage box and used for exchanging heat with the heat storage box and the silicon sand in the heat storage box.

[0010] In some embodiments of the heat exchange system, each of the heating modules in each row is arranged along a first direction, each of the heating modules in each column is arranged along a second direction, the first direction is perpendicular to the flow direction of the silicon sand, the second direction is parallel to the flow direction of the silicon sand, and a gap is left between two adjacent heating modules for the silicon sand to flow through.

[0011] In the adjacent rows along the flow direction of the silica sand, each of the heating modules in the rear row is located in the gap between the two adjacent heating modules in the front row.

[0012] In some embodiments of the heat exchange system, the heat exchange system further comprises a plurality of flow guides, each of the flow guides is accommodated in the heating tank and is located in front of the heating assembly along the flow direction of the silica sand to be able to contact the silica sand before the heating assembly;

[0013] The position of each of the flow guides corresponds to the gap between the two adjacent heating modules, the flow guide is a hexagonal prism, one side prism of the flow guide extends into the gap between the two heating modules to stand the flow guide, and the opposite two side walls of the flow guide are used to guide the flow of silica sand to the gap between the two adjacent heating modules.

[0014] In some embodiments of the heat exchange system, the heat exchange system further comprises a valve device, the valve device is installed in the heating tank and corresponds to the silica sand outlet of the heating tank; the valve device is used to adjust the flow of the silica sand.

[0015] In some embodiments of the heat exchange system, the valve device comprises a driving assembly, a first plate and a second plate, the first plate is provided with a plurality of through holes, the second plate is provided with a triangular support corresponding to each of the through holes on the side opposite to the first plate, the driving end of the driving assembly is connected to the second plate and is used to drive the second plate to approach or move away from the first plate, thereby being able to adjust the position of the triangular support extending into the through hole.

[0016] In some embodiments of the heat exchange system, the driving assembly comprises a driving member, a lead screw, two sliding plates and two wedge-shaped plates, the output end of the driving member is connected to the lead screw and is used to drive the lead screw to rotate, the lead screw is provided with a first thread and a second thread with opposite rotation directions, one of the two sliding plates is threadedly connected to the first thread, and the other is threadedly connected to the second thread, so that the two sliding plates approach or move away from each other when the lead screw rotates, the two wedge-shaped plates are connected to the sliding plates one by one, and the inclined surfaces of the two wedge-shaped plates are opposite, and the second plate is located between the two wedge-shaped plates.

[0017] In some embodiments of the heat exchange system, the heating module comprises a shell, a heating wire, a support rod and two wiring terminals, the shell is provided with an accommodation space, the heating wire and the support rod are accommodated in the accommodation space, the heating wire is spirally wound around the support rod, and the two wiring terminals are electrically connected to the heating wire and extend out of the shell and the heating tank, and the wiring terminals are used to be electrically connected to the resin protection wire.

[0018] In some embodiments of the heat exchange system, the heating module further comprises a plurality of support plates, each of the support plates is arranged between two of the terminal connectors and connected to the two terminal connectors.

[0019] In some embodiments of the heat exchange system, the heating device further comprises a refractory layer and an insulation layer, the insulation layer is attached to the inner wall of the heating tank, and the refractory layer is attached to the inner wall of the insulation layer.

[0020] In some embodiments of the heat exchange system, the number of the resin protection wires and the heating assemblies is three, each of the heating assemblies is arranged and separated in sequence along the flow direction of the silica sand, and each of the resin protection wires is connected to each of the heating assemblies one by one and connected to three-phase power.

[0021] The embodiments of the present application will have at least the following beneficial effects:

[0022] The high-voltage silica sand heat exchange system has the technical effect of heat exchange through silica sand. Specifically, the heat exchange medium used in the present application is silica sand, which is a substance that can withstand high temperature and can absorb more heat through the heating device. By arranging the resin protection wire in the heating device, high voltage can be directly connected, the power utilization rate is high, and the use of transformer can be avoided to reduce the cost. Further, the resin protection wire connects the multiple rows and multiple columns of heating modules in a mixed connection mode of series and parallel connection, which is conducive to controlling the current and voltage of the heating module, thereby better heating the silica sand. The silica sand is introduced into the heat storage tank and exchanges heat with the heat exchange device. In addition, the silica sand is circulated by the circulating conveying device, which can be reused, solving the technical problem of poor applicability of the existing heat exchange system. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 It is a schematic diagram of the overall structure of the high-voltage silica sand heat exchange system in an embodiment;

[0025] Figure 2 It is a schematic diagram of the connection structure of the heating device and the valve device in an embodiment;

[0026] Figure 3 It is a schematic diagram of the connection structure of the heating device and the valve device in an embodiment; Figure 2 The structure is shown in the semi-sectional view;

[0027] Figure 4 Structure diagram of valve device in one embodiment;

[0028] Figure 5 Structure diagram of valve device in one embodiment; Figure 4 Structure diagram of A-A part in one embodiment;

[0029] Figure 6 Structure diagram of A-A part in one embodiment; Figure 4 Structure diagram of B-B part in one embodiment;

[0030] Figure 7 Structure diagram of B-B part in one embodiment; Figure 6 Structure diagram of C part in one embodiment;

[0031] Figure 8 Structure diagram of heating module in one embodiment;

[0032] Figure 9 Structure diagram of heating module in one embodiment; Figure 8 Structure diagram of heating module in one embodiment.

[0033] Wherein:

[0034] 1, circulating conveying device; 2, distribution pipeline;

[0035] 3, heating device; 31, heating box; 32, resin protection wire; 33, heating module; 331, shell; 332, heating wire; 333, support rod; 334, terminal; 335, support sheet; 34, refractory layer; 35, heat preservation layer;

[0036] 4, heat storage box; 5, heat exchange device; 51, heat exchange box; 52, water inlet pipe; 53, water outlet pipe; 6, flow guide;

[0037] 7, valve device; 71, driving assembly; 711, driving piece; 712, screw rod; 713, sliding plate; 714, wedge-shaped plate; 72, first plate; 721, through hole; 73, second plate; 731, tripod;

[0038] 8, mounting frame. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many other different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0040] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein the terms "vertical", "horizontal", "left", "right", and the like are merely used for the purpose of illustration and are not intended to be limiting.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0042] Here, it needs to be emphasized and explained that the various connection modes involved in the present application can be arbitrary when there is no specific description, for example, fixed connection can be achieved by bolt and nut, detachable fixing, welding or integrated fixing, sliding connection can be achieved by various shapes of slot and guide rail structure, and rotating connection can be achieved by hinge and rotating shaft, etc. Any existing mode capable of achieving the corresponding connection relationship can be used.

[0043] The following will be described in detail Figures 1-9 The high-voltage silica sand heat exchange system involved in the present application will be further explained and described.

[0044] In one embodiment of the high-voltage silica sand heat exchange system, the heat exchange system comprises a circulating conveying device 1, a heating device 3, a heat storage tank 4 and a heat exchange device 5. The circulating conveying device 1 is used to circulate and convey silica sand, and has a discharge port and a feeding port. The heating device 3 comprises a heating tank 31, a resin protection wire 32 and a heating assembly. The internal space of the heating tank 31 is in communication with the discharge port. The heating assembly comprises a plurality of heating modules 33. Each heating module 33 has a heating portion and a connecting portion. The heating portion extends into the heating tank 31, and the connecting portion is electrically connected with the heating portion and extends out of the heating tank 31. Each heating module 33 is arranged in multiple rows and multiple columns. The heating modules 33 in each row are connected in series through the resin protection wire 32, and the heating modules 33 in each column are connected in parallel through the resin protection wire 32. The heat storage tank 4 is in communication with the heating tank 31 to receive the heated silica sand from the heating device 3, and is also in communication with the feeding port. The heat exchange device 5 is in contact with the heat storage tank 4 and is used to exchange heat with the heat storage tank 4 and the silica sand in the heat storage tank 4.

[0045] In the embodiment, the heat exchange medium used by the application is silica sand, which is a substance capable of withstanding high temperature, such as sand, and can absorb more heat through the heating device 3. The resin protection wire 32 is arranged in the heating device 3, which can be directly connected to high voltage, and the power utilization rate is high. In addition, the transformer can be omitted to reduce the cost. Further, the resin protection wire 32 can control the current and voltage of the heating module 33 through the mixed connection mode of series and parallel, thereby better heating the silica sand. The silica sand is introduced into the heat storage tank 4 and the heat exchange device 5 to realize heat exchange. In addition, the silica sand is circulated by the circulating conveying device 1, so that the silica sand can be reused, and the technical problem of poor applicability of the existing heat exchange system is solved.

[0046] Specifically, the resin protection wire 32 can be a 10kV medium-high voltage wire that can withstand medium-high voltage. The flow direction of the silica sand can be from top to bottom by its own gravity. Therefore, the heat exchange device 5, the heat storage tank 4 and the heating device 3 can be vertically stacked in sequence. In order to facilitate installation, a mounting rack 8 can be additionally provided, and the heating device 3 is placed at the topmost position of the mounting rack 8.

[0047] Referring to Figure 2 and Figure 3 The arrangement of the heating module 33 in the vertical direction is in one column.

[0048] In one embodiment of a high-voltage silica sand heat exchange system, each heating module 33 in each row of heating modules 33 is arranged along a first direction, and each heating module 33 in each column of heating modules 33 is arranged along a second direction. The first direction is perpendicular to the flow direction of the silica sand, and the second direction is parallel to the flow direction of the silica sand. A gap is left between the adjacent two heating modules 33 for the silica sand to flow through. In the adjacent rows along the flow direction of the silica sand, each heating module 33 in the rear row corresponds to the gap between the adjacent two heating modules 33 in the front row.

[0049] In the embodiment, specifically, each row of heating modules 33 is arranged in a linear array, and each column of heating modules 33 is also arranged in a linear array, but the heating modules 33 between adjacent rows are arranged in a staggered manner. Therefore, the heating efficiency of the silica sand can be improved during the flow of the silica sand. It can be understood that the silica sand is a solid particle and cannot produce natural convection when heated by the heating module 33. The present embodiment alternately arranges the heating modules 33, so that the silica sand can produce a mixing effect in the alternating area of the multiple layers of heating modules 33, thereby achieving better heating effect.

[0050] In an embodiment of the high-voltage silicon sand heat exchange system, the heat exchange system further comprises a plurality of flow guides 6, each of which is accommodated in the heating box 31 and is located before the heating assembly along the flow direction of the silicon sand to be in contact with the silicon sand before the heating assembly. The position of each flow guide 6 corresponds to the gap between two adjacent heating modules 33. The flow guide 6 is a hexagonal prism, one side prism of which extends into the gap between two heating modules 33 to stand the flow guide 6, and the opposite two side walls of the flow guide 6 are used to guide the silicon sand to the gap between the two adjacent heating modules 33.

[0051] In the embodiment, the flow guide 6 can be a cuboid, which is placed in the same direction as the heating module 33. The flow guide 6 is placed with the edges downward instead of the faces downward, so that the side wall surface of the flow guide 6 can form an inclined surface effect, thereby facilitating the guiding of the silicon sand to the gap between the two adjacent heating modules 33. In addition, the flow guide 6 is located above the heating module 33, which can also avoid the direct impact of the silicon sand on the heating module 33, thereby preventing the damage of the heating module 33. In addition, it can also be other structures, such as a rhombus or other irregular quadrilateral cross section, so as to achieve different flow guide speed effects by setting different inclined angles of the side wall surface, thereby controlling the speed of the silicon sand entering the heating assembly.

[0052] In an embodiment of the high-voltage silicon sand heat exchange system, the heat exchange system further comprises a valve device 7, which is installed on the heating box 31 and corresponds to the silicon sand outlet of the heating box 31. The valve device 7 is used to adjust the flow of the silicon sand.

[0053] In the embodiment, the valve device 7 can be used to adjust the flow of the silicon sand flowing out of the heating box 31 into the heat storage box 4, thereby controlling the flow rate of the silicon sand and achieving the effect of controlling the heat exchange time.

[0054] In an embodiment of the high-voltage silicon sand heat exchange system, the valve device 7 comprises a driving assembly 71, a first plate 72, and a second plate 73. The first plate 72 is provided with a plurality of through holes 721, and the second plate 73 is provided with triangular supports 731 corresponding to the through holes 721 on the side opposite to the first plate 72. The driving end of the driving assembly 71 is connected to the second plate 73 and is used to drive the second plate 73 to move towards or away from the first plate 72, thereby adjusting the position of the triangular supports 731 extending into the through holes 721.

[0055] In the embodiment, the driving assembly 71 drives the movement of the second plate 73, so that the triangular supports 731 on the second plate 73 can enter and exit the through holes 721, thereby adjusting the flow of the silicon sand through the through holes 721. Specifically, the triangular supports 731 can be formed on the second plate 73 in various ways, such as welding or integrally forming triangular protrusions, or the triangular supports 731 can be in the shape of a cone.

[0056] In an embodiment of the high-voltage silicon sand heat exchange system, the driving assembly 71 comprises a driving member 711, a screw rod 712, two sliding plates 713 and two wedge-shaped plates 714. The output end of the driving member 711 is connected to the screw rod 712 and is used to drive the screw rod 712 to rotate. The screw rod 712 is provided with a first thread and a second thread with opposite rotation directions. One of the two sliding plates 713 is threadedly connected to the first thread, and the other is threadedly connected to the second thread, so that the two sliding plates 713 can move closer to or farther away from each other when the screw rod 712 rotates. The two wedge-shaped plates 714 are connected to the sliding plates 713 one by one, and the inclined surfaces of the two wedge-shaped plates 714 are opposite to each other. The second plate 73 is located between the two wedge-shaped plates 714.

[0057] In this embodiment, specifically, the driving member 711 can be a single motor, or a motor combined with a gear set capable of engaging with the screw rod 712. The rotation of the screw rod 712 can drive the two sliding plates 713 to move closer to or farther away from each other, which in turn can drive the two wedge-shaped plates 714 to move closer to or farther away from each other. The closer movement of the two wedge-shaped plates 714 can press the second plate 73 from both ends, so that the second plate 73 is lifted and moved closer to the first plate 72, thereby enabling the tripod 731 to extend into the through hole 721. Conversely, the farther movement of the two wedge-shaped plates 714 can enable the tripod 731 to move out of the through hole 721.

[0058] Preferably, the number of screw rods 712 can be two, and the two screw rods 712 are arranged on both sides, which can more stably drive the movement of the two sliding plates 713.

[0059] Specifically, the wedge-shaped plate 714 can be directly connected to the surface of the sliding plate 713 opposite to the second plate 73, or can be connected in a non-direct manner. For example, the sliding plate 713 can be provided with a protruding strip, the inclined surface of the wedge-shaped plate 714 abuts against the second plate 73, and the wedge-shaped plate 714 is located in the movement path of the protruding strip. In this way, when the sliding plate 713 moves, the wedge-shaped plate 714 can be driven to move by the protruding strip.

[0060] In combination with the foregoing embodiments, the overall heat exchange system is multi-throttled, including the flow guide 6, the gap between the heating module 33, and the valve device 7. In this way, the flow of silicon sand can be controlled, so that the silicon sand can fully contact and exchange heat with the heat exchange device 5.

[0061] In an embodiment of the high-voltage silicon sand heat exchange system, the heating module 33 comprises an outer shell 331, a heating wire 332, a support rod 333 and two wire terminals 334. The outer shell 331 is provided with a receiving space, the heating wire 332 and the support rod 333 are accommodated in the receiving space, the heating wire 332 is spirally wound around the support rod 333, and the two wire terminals 334 are electrically connected to the heating wire 332 and extend out of the outer shell 331 and the heating box 31. The wire terminals 334 are used to be electrically connected to the resin protection wire 32.

[0062] In the embodiment, the heating wire 332 and the support rod 333 are wrapped by the shell 331, so that the erosion of the heating wire 332 caused by the flowing of the silicon sand can be avoided. The shell 331 can be made of metal or ceramic material, so that the heat transfer can be facilitated. The support plate can be a high-temperature ceramic support, which can support the heating wire 332. In the heating stage, the yield limit of the heating wire 332 is reduced due to the temperature rise, so that the short circuit caused by the softening of the heating wire 332 can be prevented.

[0063] In combination with the foregoing embodiment, specifically, the heating wire 332 is a resistance heating wire, the heating power of the single heating wire 332 can be selected as 9-12 kW, and the nickel alloy can be selected.

[0064] In an embodiment of the high-voltage silicon sand heat exchange system, the heating module 33 further comprises a plurality of support sheets 335, each of which is arranged between two wire terminals 334 and connected to the two wire terminals 334.

[0065] In the embodiment, the support sheet 335 is arranged between the two wire terminals 334, so that the support effect can be achieved and the short circuit of the heating wire 332 caused by the overlap of the two wire terminals 334 can be prevented.

[0066] Specifically, the material of the support sheet 335 can be the same as that of the support rod 333, and both are ceramic.

[0067] In an embodiment of the high-voltage silicon sand heat exchange system, the heating device 3 further comprises a refractory layer 34 and an insulation layer 35. The insulation layer 35 is attached to the inner wall of the heating box 31, and the refractory layer 34 is attached to the inner wall of the insulation layer 35.

[0068] In combination with the foregoing embodiment, the heating box 31 can have a box structure. The upper opening of the heating box 31 is used to receive the silicon sand delivered by the circulating delivery device 1. Each heating module 33 has a heating part placed in the heating box 31 in the horizontal direction, and a connecting part penetrates the side wall of the box of the heating box 31. An opening matched with the shell 331 and the flow guide 6 is arranged on the side wall of the heating box 31 penetrated by the heating module 33, so that the installation can be facilitated. The box bottom of the heating box 31 is also provided with an opening to make the silicon sand flow out. The refractory layer 34 and the insulation layer 35 in the embodiment are arranged around the inlet and outlet of the heating box 31. The refractory layer 34 mainly functions as heat insulation, and secondarily functions as support and moisture retention. The insulation layer 35 can be rock wool, which can reduce heat loss.

[0069] In one embodiment of the high-voltage silicon sand heat exchange system, the number of resin protection wires 32 and heating assemblies is three, each heating assembly is arranged and separated in sequence along the flow direction of the silicon sand, and each resin protection wire 32 is connected to each heating assembly one by one and connected to three-phase power.

[0070] In this embodiment, by arranging three groups of heating assemblies along the vertical direction, the three-phase power phases can be separated from each other, maintaining a safe distance and preventing breakdown.

[0071] In combination with the foregoing embodiments, specifically, the circulating conveying device 1 can be composed of various suction devices such as pumps to extract the silicon sand from the heat storage tank 4. An electromagnetic valve can be provided at the outlet of the heat storage tank 4, and a temperature sensor capable of detecting the temperature of the silicon sand in the heat storage tank 4 can be provided in the heat storage tank 4. When the temperature sensor detects that the temperature of the silicon sand in the heat storage tank 4 decreases, a signal is sent to the electromagnetic valve, and the electromagnetic valve is opened. The circulating conveying device 1 extracts the silicon sand from the heat storage tank 4 and transmits it back to the heating tank 31 to form a circulation. Preferably, the heating device 3, the heat storage tank 4, and the heat exchange device 5 can be provided in multiple numbers, such as nine heating devices 3 and nine heat storage tanks 4. The circulating conveying device 1 distributes the silicon sand to each heating device 3 through the distribution pipeline 2. The heat exchange device 5 can be a large box structure, or multiple heat exchange devices 5 can be provided to correspond to multiple heating devices 3 and multiple heat storage tanks 4, arranged in sequence from top to bottom as heating device 3, heat storage tank 4, and heat exchange device 5.

[0072] In addition, the heating module 33 can be modularized for easy maintenance and replacement.

[0073] Specifically, the heat exchange device 5 is provided with a water pipe, and the heat exchange device 5 can include a heat exchange tank 51, an inlet pipe 52, and an outlet pipe 53. The heat exchange tank 51 can be filled with water, so that heat exchange with the heat storage tank 4 can be achieved by simple superposition, and a circulating water flow can be formed through the inlet pipe 52 and the outlet pipe 53. The heat exchange device 5 can also include a heat exchange tank 51 and a water pipe, and the water pipe penetrates into the heat exchange tank 51. In this way, the heat exchange tank 51 can have a certain heat preservation effect, and the water pipe also extends into the heat storage tank 4 to be wrapped by the silicon sand for heat exchange.

[0074] The technical features of the above embodiments can be combined in any way. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present disclosure.

[0075] The above embodiments only express several implementation manners of the present application, the description is more specific and detailed, but cannot be understood as the limitation of the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A high voltage sand-to-sand heat exchange system, characterized by, The heat exchange system comprises: A circulating conveying device for circulating conveying silica sand, the circulating conveying device having a discharge port and a feeding port; A heating device including a heating box, resin protection wires and a heating assembly, the internal space of the heating box being in communication with the discharge port, the heating assembly including a plurality of heating modules, each of the heating modules having a heating portion and a connecting portion, the heating portion extending into the heating box, the connecting portion being electrically connected with the heating portion and extending out of the heating box, each of the heating modules being arranged in multiple rows and columns, the heating modules in each row being connected in series through the resin protection wires, and the heating modules in each column being connected in parallel through the resin protection wires; the heating device being directly connected to high-voltage electricity; A heat storage box in communication with the heating box to receive the silica sand heated by the heating device, the heat storage box also being in communication with the feeding port; A heat exchange device in contact with the heat storage box and used for heat exchange with the heat storage box and the silica sand in the heat storage box; Each of the heating modules in each row is arranged along a first direction, and each of the heating modules in each column is arranged along a second direction, the first direction being perpendicular to the flow direction of the silica sand, and the second direction being parallel to the flow direction of the silica sand, a gap being left between two adjacent heating modules to allow the silica sand to flow through; In adjacent rows along the flow direction of the silica sand, each of the heating modules in the rear row is located between two adjacent heating modules in the front row; The heat exchange system further comprises a plurality of flow guides, each of the flow guides being accommodated in the heating box and being located in front of the heating assembly along the flow direction of the silica sand to contact the silica sand before the heating assembly; The position of each of the flow guides corresponds to the gap between two adjacent heating modules, the flow guide being a hexagonal prism, one side prism of the flow guide extending into the gap between two heating modules to stand the flow guide, and the opposite two side walls of the flow guide being used to guide the flow direction of the silica sand to the gap between two adjacent heating modules; The heat exchange system further comprises a valve device, the valve device being installed on the heating box and corresponding to the silica sand outlet of the heating box; the valve device being used to adjust the flow rate of the silica sand; The valve device includes a driving assembly, a first plate and a second plate, the first plate being provided with a plurality of through holes, the second plate being provided with triangular supports corresponding to the through holes on one side opposite to the first plate, and the driving end of the driving assembly being connected to the second plate and used to drive the second plate to approach or move away from the first plate, thereby adjusting the position of the triangular supports in the through holes; The number of the resin protection wires and the heating assembly is three, each of the heating assemblies being arranged in sequence and separated along the flow direction of the silica sand, and each of the resin protection wires being connected with each of the heating assemblies in one-to-one correspondence and connected to three-phase electricity. The heating module comprises a shell, a heating wire, a support rod and two wiring terminals, the shell is internally provided with a receiving space, the heating wire and the support rod are received in the receiving space, the heating wire is spirally wound on the support rod, the two wiring terminals are electrically connected with the heating wire and extend out of the shell and the heating box, and the wiring terminals are used for being electrically connected with the resin protective wire; The heating module further comprises a plurality of support sheets, each of the support sheets is arranged between the two wiring terminals and connected with the two wiring terminals; The driving assembly comprises a driving member, a screw rod, two sliding plates and two wedge-shaped plates, the output end of the driving member is connected with the screw rod and is used for driving the screw rod to rotate, two first threads and second threads with opposite rotation directions are arranged on the screw rod, one of the two sliding plates is threadedly connected with the first thread, and the other is threadedly connected with the second thread, so that the two sliding plates are close to or away from each other when the screw rod rotates, each of the sliding plates is connected with one of the two wedge-shaped plates, and the inclined surfaces of the two wedge-shaped plates are opposite to each other, and the second plate is located between the two wedge-shaped plates.

2. A high voltage sand heat exchanger system as claimed in claim 1, wherein, The heating device further comprises a refractory layer and a heat preservation layer, the heat preservation layer is attached to the inner wall of the heating box, and the refractory layer is attached to the inner wall of the heat preservation layer.

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