Salt melting and dissolving device
The molten salt salting device addresses uneven heating and high power consumption in molten salt systems by using an overflow plate and guide member to break up liquid molten salt, enhancing heat exchange and reducing maintenance costs through independent heating rods.
Patent Information
- Application Number
- CN202420150413.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-22
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-01-22
AI Technical Summary
Large-scale molten salt energy storage systems face issues with uneven heating and increased power consumption due to solid molten salt floating or precipitating, blocking pipelines, and high maintenance costs from failed electric heaters in salt melting tanks.
A molten salt salting device with a storage tank divided by an overflow plate into solid-liquid and pure liquid areas, featuring a guide member to break up liquid molten salt, independent heating rods, and a conical structure to enhance heat exchange and reduce power consumption.
Enhances heat exchange efficiency, accelerates the melting process, reduces power consumption, and simplifies maintenance by allowing individual replacement of heating rods, thus improving operational stability and cost-effectiveness.
Smart Images
Figure CN222151940U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of molten salt salting, and in particular to a molten salt salting device. Background Art
[0002] Molten salt energy storage technology has the characteristics of large-scale, long-cycle and low-cost energy storage, and is widely used in the fields of solar thermal, large-scale energy storage, peak-shaving and frequency regulation, and clean heating in thermal power plants. Molten salt has a high melting point. Depending on the type of molten salt, its solidification point is between 150-400°C. Therefore, the molten salt needs to be treated with salt before entering the thermal storage system for heat storage. After being heated from solid to high-temperature liquid, it enters the thermal storage system to start circulation and remains liquid throughout the energy storage cycle. The main salt-shaving methods are currently steam heating, electric heating, and natural gas heating. Among them, electrically heated molten salt is convenient to use because its heat source comes from electricity. It is widely used in renewable energy clean heating, large-scale energy storage, peak-shaving and frequency regulation in thermal power plants, and Carnot battery transformation of retired thermal power units.
[0003] Since a large amount of molten salt is required in large-scale molten salt energy storage technology, a large amount of solid molten salt is usually required. At this time, it is easy to cause a large amount of solid molten salt to be difficult to melt, causing large pieces of solid molten salt to float above the high-temperature liquid molten salt or precipitate in the high-temperature liquid molten salt, making the molten salt heated more unevenly, reducing the salt melting rate and increasing the power consumption of the salt melting. At the same time, the unmelted solid molten salt will block the molten salt pump or enter the molten salt pipeline through the molten salt pump, causing the molten salt pipeline to be blocked or the heat exchange equipment to be blocked. In addition, the widely used electric heater for the salt melting tank is a plate heater, which is directly embedded in the bottom of the salt melting tank. If the electric heater fails, it needs to be replaced as a whole, and the maintenance cost is high. Utility Model Content
[0004] The utility model provides a molten salt salting device, which can solve at least one of the above technical problems.
[0005] In order to solve the above problems, the utility model provides a molten salt salting device, comprising a storage tank, wherein the storage tank has an overflow plate, the bottom and the side of the overflow plate are respectively sealed and fixed to the bottom wall and the side wall of the storage tank, and the overflow plate divides the inner cavity of the storage tank into a solid-liquid storage area and a pure liquid storage area;
[0006] The pure liquid storage area is provided with a molten salt pump to discharge the liquid molten salt in the pure liquid storage area from the main pipeline;
[0007] A solid particle feed inlet and a liquid feed inlet are provided above the solid-liquid storage area. The liquid feed inlet is connected to the main pipeline through a circulation pipeline. A guide piece is fixed below the liquid feed inlet to break up the liquid molten salt and drop it to the solid-liquid storage area.
[0008] Preferably, the guide member comprises a conical block which is smaller at the top and larger at the bottom, and the conical block is fixed to the inner top wall of the storage tank via a connecting strip, and there are a plurality of connecting strips which are arranged at intervals along the circumference of the conical block.
[0009] Preferably, the bottom of the pure liquid storage area is lower than the bottom of the solid-liquid storage area, and the cross-sectional dimension of the bottom of the pure liquid storage area is smaller than the cross-sectional dimension of the bottom of the solid-liquid storage area.
[0010] Preferably, the pure liquid storage area is a vertical cylindrical structure, and the solid-liquid storage area is a horizontal cylindrical structure.
[0011] Preferably, the side wall of the solid-liquid storage area has a plurality of first through holes and thermocouples, and the first through holes are sealed and penetrated with sleeves; the bottom of the sleeve is located in the solid-liquid storage area, and the mouth is located outside the storage tank;
[0012] A heating rod is sleeved in the sleeve.
[0013] Preferably, the heating rods are arranged independently of each other.
[0014] Preferably, a support plate is fixedly provided in the solid-liquid storage area, the support plate has a plurality of second through holes, and the sleeve passes through the second through holes; the bottom of the support plate has a through groove to connect the spaces on both sides thereof.
[0015] Preferably, a fixed plate is provided in the solid-liquid storage area, the fixed plate has a plurality of third through holes, and the sleeve passes through the third through holes; the bottom of the fixed plate is suspended.
[0016] Preferably, the fixing plate is located between the supporting plate and the overflow plate.
[0017] Preferably, the overflow plate is welded to the inner wall of the storage tank;
[0018] And / or, the support plate is welded to the inner wall of the storage tank;
[0019] And / or, the fixing plate is welded to the inner wall of the storage tank.
[0020] The molten salt salting device provided by the utility model has the following beneficial effects:
[0021] The molten salt salting device provided by the embodiment of the utility model has a guide member fixedly provided below the liquid inlet. With such arrangement, during the salting process of the device, the liquid molten salt falls onto the guide member and is broken into smaller liquid molten salt droplets under the action of its own gravity, and falls into the solid-liquid storage area to disturb the solid-liquid coexisting molten salt in the solid-liquid storage area to make it flow, thereby avoiding local overheating of the solid-liquid storage area, thereby enhancing the heat exchange effect of the solid molten salt in the solid-liquid storage area and improving the salting rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0023] Figure 1 A schematic diagram of the structure of a molten salt salting device provided in an embodiment of the utility model;
[0024] Figure 2 A schematic diagram of the structure of an overflow plate of a molten salt salting device provided in an embodiment of the utility model;
[0025] Figure 3 A schematic diagram of the structure of the side wall of the storage tank of the molten salt salting device provided in an embodiment of the utility model;
[0026] Figure 4 A schematic diagram of the structure of a support plate of a molten salt salting device provided in an embodiment of the utility model;
[0027] Figure 5 A schematic structural diagram of a fixing plate of a molten salt salting device provided in an embodiment of the utility model.
[0028] Description of reference numerals:
[0029] 100-storage tank; 200-overflow plate; 300-molten salt pump; 400-main pipeline; 500-circulation pipeline;
[0030] 101-solid-liquid storage area; 102-pure liquid storage area; 103-solid particle inlet; 104-liquid inlet; 105-flow guide; 106-connecting strip; 107-first through hole; 108-thermocouple; 109-sleeve; 110-heating rod; 111-support plate; 112-second through hole; 113-fixing plate; 114-third through hole. DETAILED DESCRIPTION
[0031] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0032] The present invention will be further described in detail below through specific implementation examples in conjunction with the accompanying drawings.
[0033] The present invention provides a molten salt device, such as Figure 1 and Figure 2 As shown, the device includes a storage tank 100, and the storage tank 100 has an overflow plate 200. The bottom and side of the overflow plate 200 are sealed and fixed to the bottom wall and side wall of the storage tank respectively. The overflow plate 200 divides the inner cavity of the storage tank 100 into a solid-liquid storage area 101 and a pure liquid storage area 102. The pure liquid storage area 102 is provided with a molten salt pump 300 to discharge the liquid molten salt in the pure liquid storage area 102 from the main pipeline 400. A solid particle feed port 103 and a liquid feed port 104 are provided above the solid-liquid storage area 101. The liquid feed port 104 is connected to the main pipeline 400 through a circulation pipeline 500. A guide member 105 is fixed below the liquid feed port 104 to break up the liquid molten salt and drop it to the solid-liquid storage area 101.
[0034] In the salting process of the device, the solid molten salt enters the solid-liquid storage area 101 through the solid particle inlet 103 and is heated and melted. After the molten salt is melted, the volume increases, and the unmelted solid molten salt is deposited at the bottom of the solid-liquid storage area 101. The liquid molten salt obtained after melting overflows to the pure liquid storage area 102 through the overflow plate 200, thereby achieving complete solid-liquid separation of the molten salt. The molten salt pump 300 transfers the liquid molten salt from the main pipeline 400 to the circulation pipeline 500, and the liquid molten salt flows out from the circulation pipeline 500 and falls below the liquid inlet 104. On the guide member 105, the liquid molten salt is broken up into smaller liquid molten salt droplets under the action of its own gravity and falls into the solid-liquid storage area 101 to disturb the solid-liquid coexisting molten salt in the solid-liquid storage area 101. At this time, the scattered liquid molten salt droplets play a role of stirring and heating, which can make the solid-liquid coexisting molten salt in the solid-liquid storage area 101 flow, avoid local overheating of the solid-liquid storage area 101, strengthen the heat exchange effect of the solid molten salt in the solid-liquid storage area 101, and thus accelerate the salting process and reduce the power consumption in the salting process.
[0035] Specifically, Figure 1As shown, the guide 105 includes a conical block that is small at the top and large at the bottom. The conical block is fixed to the inner top wall of the storage tank 100 through a connecting strip 106. There are multiple connecting strips 106, which are arranged at intervals along the circumference of the conical block. The guide 105 in the device is set as a conical structure that is small at the top and large at the bottom, which is conducive to breaking up the liquid molten salt into smaller liquid molten salt droplets. In the prior art, the guide 105 is set as a spray gun structure. Since the molten salt itself is easy to solidify at low temperature, the caliber of the spray gun is easy to be blocked, affecting the operation stability of the device; compared with the prior art, the structure of the guide 105 in the molten salt salting device provided in the embodiment of the utility model will not affect the operation stability, and the structure is simpler, and there is no need to install multiple, saving materials.
[0036] The molten salt salting device provided in the embodiment of the utility model is as follows: Figure 1 As shown, the bottom of the pure liquid storage area 102 is lower than the bottom of the solid-liquid storage area 101, and the bottom cross-sectional size of the pure liquid storage area 102 is smaller than the bottom cross-sectional size of the solid-liquid storage area 101. In the device, the bottom cross-sectional size of the pure liquid storage area 102 is smaller than the bottom cross-sectional size of the solid-liquid storage area 101. This arrangement reduces the footprint of the device and saves space. During the use of the molten salt pump 300, a certain depth is reserved at the bottom of the pure liquid storage area 102, and the bottom of the pure liquid storage area 102 is lower than the bottom of the solid-liquid storage area 101. This arrangement can reduce the remaining amount of molten salt at the bottom, so that the device saves space while increasing the effective utilization volume of molten salt.
[0037] The molten salt salting device provided in the embodiment of the utility model is as follows: Figure 1 As shown, the pure liquid storage area 102 is a vertical cylindrical structure, and the solid-liquid storage area 101 is a horizontal cylindrical structure. In addition, the pure liquid storage area 102 can also be set as a cube or a rectangular parallelepiped structure (not shown in the figure), and the solid-liquid storage area 101 can also be set as a capsule-shaped structure (not shown in the figure).
[0038] Specifically, Figure 3 As shown, the side wall of the solid-liquid storage area 101 has a plurality of first through holes 107 and thermocouples 108, and the first through holes 107 are sealed and penetrated with a sleeve 109; the bottom of the sleeve 109 is located in the solid-liquid storage area 101, and the mouth is located outside the storage tank 100, and a heating rod 110 is sleeved in the sleeve 109. In this way, the device heats the molten salt in the solid-liquid storage area 101 through the heating rod 110 in the sleeve 109, and detects the temperature of the molten salt in the solid-liquid storage area 101 in real time through the thermocouple 108 (temperature sensor), and generates a power control signal according to the temperature change, and adjusts the heating power of the heating rod 110 through the power control signal to avoid over-temperature damage of the heating rod 110 and reduce maintenance costs.
[0039] The molten salt salting device provided in the embodiment of the utility model is as follows: Figure 1 As shown, the heating rods 110 are independently arranged. In this arrangement, if the heating rod 110 is damaged, the heating rod 110 can be replaced alone, which simplifies the maintenance process and reduces the maintenance cost.
[0040] The molten salt salting device provided in the embodiment of the utility model is as follows: Figure 1 and Figure 4 As shown, a support plate 111 is fixed in the solid-liquid storage area 101, and the support plate 111 has a plurality of second through holes 112, and the sleeve 109 passes through the second through holes 112; the bottom of the support plate 111 has a through groove to connect the spaces on both sides thereof. In the device, the support plate 111 is used to fix the sleeve 109 to keep it stable, and the through groove at the bottom of the support plate 111 can ensure that the molten salt flows at the bottom of the solid-liquid storage area 101 to avoid local overheating.
[0041] The molten salt salting device provided in the embodiment of the utility model is as follows: Figure 1 and Figure 5 As shown, a fixed plate 113 is provided in the solid-liquid storage area 101, and the fixed plate 113 has a plurality of third through holes 114, and the sleeve 109 passes through the third through holes 114; the bottom of the fixed plate 113 is suspended. In the device, the fixed plate 113 is used to fix the sleeve 109 to keep it stable. The bottom of the fixed plate 113 is suspended to ensure that the two sides of the fixed plate 113 are connected, so that the molten salt can flow at the bottom of the solid-liquid storage area 101.
[0042] The molten salt salting device provided in the embodiment of the utility model is as follows: Figure 1 As shown, the fixing plate 113 is located between the supporting plate 111 and the overflow plate 200 , the overflow plate 200 is welded to the inner wall of the storage tank 100 , the supporting plate 111 is welded to the inner wall of the storage tank 100 , and the fixing plate 113 is welded to the inner wall of the storage tank 100 .
[0043] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "horizontal", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "installation" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. A molten salt salting device, characterized in that: A storage tank is provided, wherein the storage tank has an overflow plate, the bottom and the side of the overflow plate are respectively sealed and fixed to the bottom wall and the side wall of the storage tank, and the overflow plate divides the inner cavity of the storage tank into a solid-liquid storage area and a pure liquid storage area; The pure liquid storage area is provided with a molten salt pump to discharge the liquid molten salt in the pure liquid storage area from the main pipeline; A solid particle feed inlet and a liquid feed inlet are provided above the solid-liquid storage area. The liquid feed inlet is connected to the main pipeline through a circulation pipeline. A guide piece is fixed below the liquid feed inlet to break up the liquid molten salt and drop it to the solid-liquid storage area.
2. The molten salt device according to claim 1, characterized in that: The guide member comprises a conical block which is smaller at the top and larger at the bottom. The conical block is fixed to the inner top wall of the storage tank via a connecting strip. There are a plurality of connecting strips which are spaced apart along the circumference of the conical block.
3. The molten salt device according to claim 1, characterized in that: The bottom of the pure liquid storage area is lower than the bottom of the solid-liquid storage area, and the cross-sectional size of the bottom of the pure liquid storage area is smaller than the cross-sectional size of the bottom of the solid-liquid storage area.
4. The molten salt device according to claim 3, characterized in that: The pure liquid storage area is a vertical cylindrical structure, and the solid-liquid storage area is a horizontal cylindrical structure.
5. The molten salt device according to claim 1, characterized in that: The side wall of the solid-liquid storage area has a plurality of first through holes and thermocouples, and the first through holes are sealed with sleeves; the bottom of the sleeve is located in the solid-liquid storage area, and the mouth is located outside the storage tank; A heating rod is sleeved in the sleeve.
6. The molten salt device according to claim 5, characterized in that: The heating rods are arranged independently of each other.
7. The molten salt device according to claim 6, characterized in that: A support plate is fixedly arranged in the solid-liquid storage area. The support plate has a plurality of second through holes, and the sleeve passes through the second through holes. A through groove is provided at the bottom of the support plate to connect the spaces on both sides thereof.
8. The molten salt device according to claim 7, characterized in that: A fixed plate is arranged in the solid-liquid storage area, the fixed plate has a plurality of third through holes, and the sleeve passes through the third through holes; the bottom of the fixed plate is suspended.
9. The molten salt device according to claim 8, characterized in that: The fixing plate is located between the supporting plate and the overflow plate.
10. The molten salt device according to claim 9, characterized in that: The overflow plate is welded to the inner wall of the storage tank; And / or, the support plate is welded to the inner wall of the storage tank; And / or, the fixing plate is welded to the inner wall of the storage tank.