Tower type photo-thermal power station fused salt storage tank electric heater

Abstract

The utility model relates to the technical field of molten salt storage tank heating, and discloses a tower type photo-thermal power station molten salt storage tank electric heater which comprises an installation seat, an electric heating rod used for heating is fixedly installed on one side of the installation seat, and a sleeve is fixedly installed on the other side of the installation seat. The heat conduction structure comprises a diffusion plate, first fins and second fins, the diffusion plate is fixedly connected with the end of the electric heating rod, the first fins and the second fins are fixedly installed at the two ends of the diffusion plate correspondingly, and the annular diffusion plate made of the metal material can conduct heat generated by the electric heating rod into the tank body; the heat dissipation area of the diffusion plate is increased through the first fins and the second fins, the heating effect on molten salt in the tank body is improved, the convection effect of molten salt fluid in the tank body can be promoted through the multiple first fins and the multiple second fins, solidification and blockage caused by local cooling can be prevented, layering possibly caused by different salt density differences is restrained, and the heat dissipation efficiency is improved. The composition uniformity is ensured, and the thermophysical fluctuation is avoided.

Description

Technical Field

[0001] This utility model relates to the field of molten salt storage tank heating technology, and in particular to an electric heater for a molten salt storage tank in a tower-type solar thermal power plant. Background Technology

[0002] To ensure relatively stable power generation, thermal storage measures must be taken. The thermal storage system is an essential component of a tower solar thermal power plant, and the molten salt storage tank is one of the most important pieces of equipment in the thermal storage system. During the operation and shutdown of the power plant, the temperature of the molten salt in the tank must be maintained above the freezing point and must always be in a molten state.

[0003] A search revealed a prior art molten salt tank heating device for a tower-type solar thermal power plant thermal storage system (publication number: CN213208213U), comprising a molten salt tank and a heating device. The heating device is used to heat the salt liquid inside the molten salt tank, and the heating device employs direct heating or indirect heating. The heating device comprises a first part and a second part, wherein the first part is an installation part, and a fixed flange is installed at the end of the installation part; the second part is a heating tube, and a detachable heating coil is installed inside the heating tube; an auxiliary heat conduction device is also provided outside the heating tube, and the total heat dissipation area of ​​the auxiliary heat conduction device and the heating tube is greater than the heat dissipation area of ​​the heating tube alone.

[0004] Existing technology heats molten salt using a horizontally placed sleeve and a heat-conducting pipe installed inside the sleeve. The heat-conducting pipe extends into the internal space of the tank. To ensure sufficient heat dissipation area, the horizontally placed heat-conducting pipe needs to pass through the center of the tank. However, some molten salt tanks require a structure that is used in conjunction with physical stirring to prevent the stratification of different media. The horizontally placed heat-conducting pipe will affect the installation and operation of the material stirring structure. Furthermore, even if the outside of the horizontally placed round pipe is equipped with heat dissipation fins, it lacks guidance and dispersion for the flowing molten salt, which can easily lead to uneven heating.

[0005] Therefore, we propose an electric heater for the molten salt storage tank of a tower-type solar thermal power plant. Utility Model Content

[0006] The present invention mainly addresses the technical problem that the heat pipes mentioned above can affect the installation and operation of the physical stirring structure, and provides an electric heater for the molten salt storage tank of a tower solar thermal power plant.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: an electric heater for a molten salt storage tank in a tower-type solar thermal power plant, comprising:

[0008] A mounting base is provided, on one side of which an electric heating rod for heating is fixedly mounted, and on the other side of which a sleeve is fixedly mounted, the electric heating rod extending to one side through the sleeve;

[0009] A heat-conducting structure is provided at the end of the electric heating rod for heat dissipation. The heat-conducting structure includes a diffuser plate, a first fin, and a second fin. The diffuser plate is fixedly connected to the end of the electric heating rod. The diffuser plate is annular, and several first fins and second fins are fixedly installed at both ends of the diffuser plate.

[0010] In a preferred embodiment of this utility model, the inner wall of the sleeve is provided with several annular grooves, and a sealing ring is provided in the annular groove. The electric heating rod extends through each sealing ring to one side of the sleeve.

[0011] In a preferred embodiment of this utility model, the diffuser plate is a metal ring, the outer circumferential surface of the diffuser plate is fixedly connected to the electric heating rod, the first fin is fixedly disposed at the upper end of the diffuser plate, and the second fin is fixedly disposed at the lower end of the diffuser plate.

[0012] In a preferred embodiment of the present invention, the first fin forms an arc-shaped plate, the end of the first fin is fixedly connected to the top of the diffuser plate, the first fin is perpendicular to the upper end face of the diffuser plate, and multiple first fins are equidistantly distributed on the end face of the diffuser plate.

[0013] In a preferred embodiment of this utility model, the second fin is a plate with an arc-shaped horizontal cross section, and several second fins are equidistantly arranged at the lower end of the diffuser plate, with a gap between adjacent second fins, and the second fins are staggered from the first fins.

[0014] In a preferred embodiment of the present invention, the heat-conducting structure further includes an extension body, wherein an extension body is fixedly provided on one side of each second fin, and multiple extension bodies form a grate structure.

[0015] In a preferred embodiment of the present invention, the extension body is integrally formed with the second fin, the extension body is fixedly disposed on the outer circumferential surface of the second fin, the second fin forms a V-shaped folded plate, and the extension body extends upward at an angle from one side of the second fin.

[0016] Beneficial effects

[0017] This utility model provides an electric heater for a molten salt storage tank in a tower-type solar thermal power plant. It has the following beneficial effects:

[0018] 1. This is an electric heater for a molten salt storage tank in a tower-type solar thermal power plant. It uses an electric heating rod to generate heat, and a sealing ring inside the casing ensures a seal between the heating rod and the casing, preventing leakage. A metal annular diffuser plate directs the heat generated by the heating rod into the tank. A gap is left between the diffuser plate and the inner wall of the tank. First and second fins increase the heat dissipation area of ​​the diffuser plate, improving the heating effect on the molten salt inside the tank. Furthermore, by setting an annular diffuser plate with multiple first and second fins at both ends, it promotes convection of the molten salt fluid within the tank, preventing solidification and blockage caused by localized cooling, suppressing stratification caused by density differences in different salts, ensuring uniform composition, and avoiding fluctuations in thermal properties.

[0019] 2. The electric heater for the molten salt storage tank of the tower-type solar thermal power plant, through the combination of an annular diffuser plate and multiple first fins and second fins distributed in an annular array, can avoid motion interference from the operation of the mechanical stirring system when the tank is equipped with a stirring system. At the same time, the arc surfaces of the multiple first fins and second fins can form a counter-current surface, which makes the convection effect of the molten salt fluid better and assists the homogenization effect of mechanical stirring.

[0020] 3. The electric heater for the molten salt storage tank of this tower-type solar thermal power plant features an extension body on one side of each second fin. Since multiple extension bodies extend upward at an angle, they can form a funnel-shaped grate structure. When the molten salt flows in the tank, the grate structure can shear and compress the flowing molten salt, promoting uniformity of the molten salt and reducing stratification and property fluctuations caused by temperature differences. At the same time, the hollow design of the grate structure will not affect the installation and operation of the mechanical stirring structure. Attached Figure Description

[0021] Figure 1 This is one of the overall perspective views of this utility model;

[0022] Figure 2 This is the second overall perspective view of the present utility model;

[0023] Figure 3 This is a perspective view of the second fin and the extension of the present invention;

[0024] Figure 4 This is one of the schematic diagrams showing the installation of the mounting base and the molten salt tank of this utility model;

[0025] Figure 5 This is the second schematic diagram of the installation of the mounting base and the molten salt tank of this utility model.

[0026] Legend: 10. Mounting base; 11. Electric heating rod; 12. Sleeve; 13. Diffuser plate; 14. First fin; 15. Second fin; 16. Extension body. Detailed Implementation

[0027] An electric heater for a molten salt storage tank in a tower-type solar thermal power plant, such as Figure 1 , Figure 4 and Figure 5 As shown, it includes:

[0028] Mounting base 10, an electric heating rod 11 for heating is fixedly installed on one side of mounting base 10, and a sleeve 12 is fixedly installed on the other side of mounting base 10. The electric heating rod 11 extends to one side through the sleeve 12. Mounting base 10 is used on the molten salt tank body, which will be referred to as the tank body in the following text. Mounting base 10 is fixedly set on the outer side of the tank body by a flange. The sleeve 12 horizontally penetrates the tank body and extends into the interior of mounting base 10. The tank body is a round tank as an example, which will not be described in detail here.

[0029] like Figure 1 and Figure 2 A heat-conducting structure is provided at the end of the electric heating rod 11 for heat dissipation. The heat-conducting structure includes a diffuser plate 13, a first fin 14, and a second fin 15. The diffuser plate 13 is fixedly connected to the end of the electric heating rod 11. The diffuser plate 13 is annular, and several first fins 14 and second fins 15 are fixedly installed at both ends of the diffuser plate 13. Several annular grooves are formed on the inner wall of the sleeve 12, and sealing rings are provided in the annular grooves. The electric heating rod 11 extends through each sealing ring to one side of the sleeve 12. The diffuser plate 13 is a metal ring, and its outer circumferential surface is fixedly connected to the electric heating rod 11. The first fin 14 is fixedly disposed at the upper end of the diffuser plate 13, and the second fin 15 is fixedly disposed at the lower end of the diffuser plate 13. The first fin 14 forms an arc-shaped plate, and the end of the first fin 14 is fixedly connected to the top of the diffuser plate 13. The first fin 14 is perpendicular to the upper end face of the diffuser plate 13. Multiple first fins 14 are equidistantly distributed on the end face of the diffuser plate 13. The second fin 15 is a plate with a horizontal cross-section in the shape of an arc. Several second fins 15 are equidistantly disposed at the lower end of the diffuser plate 13. There is a gap between two adjacent second fins 15. The second fins 15 are staggered from the first fins 14.

[0030] In this scheme, the electric heating rod 11 is mainly heated by electricity. The sealing ring inside the sleeve 12 is used to seal the electric heating rod 11 and the sleeve 12 to prevent leakage. The metal annular diffuser plate 13 can introduce the heat generated by the electric heating rod 11 into the tank. The diffuser plate 13 has a gap with the inner wall of the tank. The heat dissipation area of ​​the diffuser plate 13 is increased by the first fin 14 and the second fin 15, which improves the heating effect on the molten salt inside the tank. Secondly, by setting the annular diffuser plate 13 and setting multiple first fins 14 and second fins 15 at both ends of the diffuser plate 13, the convection effect of the molten salt fluid in the tank can be promoted, which can prevent solidification blockage caused by local cooling, suppress the stratification that may be caused by the density difference of different salts (such as the mixture of NaNO3 and KNO3), ensure uniform composition, and avoid thermal property fluctuations.

[0031] Secondly, the annular diffuser plate 13, together with the multiple first fins 14 and second fins 15 distributed in an annular array, can avoid motion interference from the mechanical stirring system when the tank is equipped with a stirring system. At the same time, the arc surfaces of the multiple first fins 14 and second fins 15 can form a counter-attack surface, which makes the convection effect of the molten salt fluid better and assists the homogenization effect of mechanical stirring.

[0032] like Figure 2 and Figure 3 As shown, the heat-conducting structure also includes an extension body 16. An extension body 16 is fixedly provided on one side of each second fin 15. Multiple extension bodies 16 form a grate structure. The extension body 16 is integrally formed with the second fin 15. The extension body 16 is fixedly provided on the outer circumferential surface of the second fin 15. The second fin 15 forms a folded plate with a V-shaped cross section. The extension body 16 extends upward at an angle from one side of the second fin 15.

[0033] In this scheme, as a supplement to the above scheme, an extension body 16 is provided on one side of each second fin 15. Since multiple extension bodies 16 extend upward at an angle, they can form a funnel-shaped grate structure. When the molten salt in the tank flows, the grate structure can shear and compress the flowing molten salt, promote the uniformity of the molten salt, reduce stratification and property fluctuations caused by temperature differences, and the hollow design of the grate structure will not affect the installation and operation of the mechanical stirring structure.

[0034] The working principle of this utility model is as follows: The electric heating rod 11 generates heat when energized. The sealing ring inside the sleeve 12 achieves a seal between the electric heating rod 11 and the sleeve 12 to prevent leakage. The annular diffuser plate 13 made of metal can introduce the heat generated by the electric heating rod 11 into the tank. There is a gap between the diffuser plate 13 and the inner wall of the tank. The heat dissipation area of ​​the diffuser plate 13 is increased by the first fin 14 and the second fin 15, which improves the heating effect on the molten salt inside the tank. Secondly, by setting the annular diffuser plate 13 and setting multiple first fins 14 and second fins 15 at both ends of the diffuser plate 13, the convection effect of the molten salt fluid in the tank can be promoted, which can prevent solidification and blockage caused by local cooling. By setting an extension body 16 on one side of each second fin 15, since multiple extension bodies 16 extend upward at an angle, multiple extension bodies 16 can form a funnel-shaped grate structure. When the molten salt in the tank flows, the grate structure can shear and squeeze the flowing molten salt, which promotes the uniformity of the molten salt.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An electric heater for a molten salt storage tank in a tower-type solar thermal power plant, characterized in that, include: Mounting base (10), an electric heating rod (11) for heating is fixedly mounted on one side of the mounting base (10), and a sleeve (12) is fixedly mounted on the other side of the mounting base (10), the electric heating rod (11) extends to one side through the sleeve (12); A heat-conducting structure is provided at the end of the electric heating rod (11) for heat dissipation. The heat-conducting structure includes a diffuser plate (13), a first fin (14), and a second fin (15). The diffuser plate (13) is fixedly connected to the end of the electric heating rod (11). The diffuser plate (13) is annular, and several first fins (14) and second fins (15) are fixedly installed at both ends of the diffuser plate (13).

2. The electric heater for the molten salt storage tank of a tower-type solar thermal power plant according to claim 1, characterized in that: The inner wall of the sleeve (12) is provided with several annular grooves, and a sealing ring is provided in the annular groove. The electric heating rod (11) extends through each sealing ring to one side of the sleeve (12).

3. The electric heater for the molten salt storage tank of a tower-type solar thermal power plant according to claim 1, characterized in that: The diffuser plate (13) is a metal ring. The outer circumferential surface of the diffuser plate (13) is fixedly connected to the electric heating rod (11). The first fin (14) is fixedly disposed at the upper end of the diffuser plate (13), and the second fin (15) is fixedly disposed at the lower end of the diffuser plate (13).

4. The electric heater for the molten salt storage tank of a tower-type solar thermal power plant according to claim 1, characterized in that: The first fin (14) forms an arc-shaped plate. The end of the first fin (14) is fixedly connected to the top of the diffuser plate (13). The first fin (14) is perpendicular to the upper surface of the diffuser plate (13). Multiple first fins (14) are equidistantly distributed on the end surface of the diffuser plate (13).

5. The electric heater for the molten salt storage tank of a tower-type solar thermal power plant according to claim 1, characterized in that: The second fin (15) is a plate with an arc-shaped horizontal cross section. Several second fins (15) are equidistantly arranged at the lower end of the diffuser plate (13). There is a gap between two adjacent second fins (15). The second fins (15) are staggered from the first fin (14).

6. The electric heater for the molten salt storage tank of a tower-type solar thermal power plant according to claim 1, characterized in that: The heat-conducting structure also includes an extension (16), and an extension (16) is fixedly provided on one side of each of the second fins (15), and multiple extensions (16) form a grate structure.

7. The electric heater for the molten salt storage tank of a tower-type solar thermal power plant according to claim 6, characterized in that: The extension body (16) is integrally formed with the second fin (15). The extension body (16) is fixedly disposed on the outer circumferential surface of the second fin (15). The second fin (15) forms a V-shaped folded plate. The extension body (16) extends upward from one side of the second fin (15).

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