Molten salt storage tank capable of efficiently loading liquid molten salt and supporting foundation

Abstract

The utility model discloses a fused salt storage tank capable of efficiently loading liquid fused salt and a supporting foundation, belongs to the technical field of fused salt storage tank design, and can solve the problems of low fused salt utilization rate and high heat storage cost caused by the fact that a large amount of ineffective fused salt is easily caused by the structure of an existing fused salt storage tank. The molten salt storage tank comprises a tank body with an opening in the bottom end; the bottom plate is connected to the bottom of the tank body and used for sealing the opening; the bottom plate is provided with a groove protruding outwards in the direction away from the tank body. The groove is used for accommodating the suction end of a molten salt pump of the molten salt storage tank; a gap is formed between the notch edge of the groove and the bottom plate; and the connecting plate is connected between the notch edge of the groove and the bottom plate and is used for sealing the gap. The molten salt loading device is used for loading molten salt.

Description

Technical Field

[0001] The utility model relates to a molten salt storage tank for efficiently loading liquid molten salt and a supporting foundation, belonging to the technical field of molten salt storage tank design. Background Art

[0002] As an important device in large-capacity, high-parameter heat storage systems, molten salt storage tanks are mainly used to load large amounts of molten salt or other high-temperature media to ensure the stable operation of the heat storage system.

[0003] The molten salt storage tank is usually a vertical cylinder, consisting of a tank bottom, a tank wall and a tank top. The tank bottom is usually designed to be approximately flat. A molten salt pump for extracting molten salt is installed in the molten salt storage tank. Long-axis vertical submersible pumps are usually used in industrial applications. In order to meet the safety protection liquid level requirements of the molten salt pump and ensure the normal operation of the molten salt pump, the suction end of the molten salt pump needs to be at a certain height from the tank bottom. This causes the molten salt to be unable to be pumped out by the molten salt pump to participate in the circulation of the heat storage system when the liquid level is lower than this height, and a large amount of ineffective molten salt is formed at the bottom of the tank, which not only reduces the utilization rate of the molten salt, but also increases the construction and operation costs of the heat storage system. Utility Model Content

[0004] The utility model provides a molten salt storage tank and a supporting foundation for efficiently loading liquid molten salt, which can solve the problem that the structure of the existing molten salt storage tank easily produces a large amount of ineffective molten salt, resulting in low molten salt utilization rate and high heat storage cost.

[0005] On the one hand, the utility model provides a molten salt storage tank for efficiently loading liquid molten salt, the molten salt storage tank comprising:

[0006] A tank body having an opening at a bottom end;

[0007] A bottom plate is connected to the bottom of the tank body and is used to close the opening; a groove convex outwardly away from the tank body is provided on the bottom plate; the groove is used to accommodate the suction end of the molten salt pump of the molten salt storage tank; and there is a gap between the notch edge of the groove and the bottom plate;

[0008] A connecting plate is connected between the notch edge of the groove and the bottom plate and is used to close the gap.

[0009] Optionally, the groove comprises:

[0010] A groove wall, the upper end of which is connected to the connecting plate;

[0011] A groove bottom connected to the lower end of the groove wall;

[0012] The first reinforcement member is fixedly arranged at the connection between the groove wall and the groove bottom, and is used to limit the lateral deformation of the groove bottom.

[0013] Optionally, the molten salt storage tank further comprises:

[0014] The second reinforcing member is arranged at the upper end of the groove wall and fixedly connected to the opposite side walls on the groove wall to limit the distance between the opposite side walls.

[0015] Optionally, the groove is an arc-shaped groove.

[0016] Optionally, the first reinforcement member and the second reinforcement member are both angle steels.

[0017] On the other hand, the utility model also provides a support foundation for any of the above-mentioned molten salt storage tanks, the support foundation comprising:

[0018] a concrete base having a support trough thereon;

[0019] A heat insulation layer is arranged in the supporting groove;

[0020] A support layer is arranged on the insulation layer and located in the support groove, and is used to support the molten salt storage tank; a receiving groove matching the groove is opened on the support layer, and the receiving groove is used to receive the groove body of the groove;

[0021] The flexible material is filled between the supporting layer and the bottom plate.

[0022] Optionally, the supporting foundation further includes:

[0023] A concrete ring beam is arranged in the support groove of the concrete base, and its outer side wall contacts the inner wall of the support groove, its inner side wall contacts the support layer, and its bottom wall contacts the insulation layer, and is used to support the edge of the base plate; the flexible material is filled between the base plate and the support layer and the concrete ring beam.

[0024] Optionally, the upper surface of the concrete ring beam is flush with the upper surface of the supporting layer.

[0025] Optionally, the thermal insulation layer is a bulk material.

[0026] Optionally, the flexible material is quartz sand or ceramsite sand.

[0027] The beneficial effects that the utility model can produce include:

[0028] The utility model provides a groove on the bottom plate of the molten salt storage tank and places the suction end of the molten salt pump in the groove, so that the amount of ineffective molten salt can be reduced from that required to cover the entire bottom plate to that required to fill the groove, thereby achieving a significant reduction in the amount of ineffective molten salt and effectively improving the utilization rate of the molten salt. At the same time, the capacity of the molten salt storage tank can be reduced accordingly, greatly saving the construction cost of the molten salt storage tank.

[0029] The utility model can make the groove have a function similar to that of a U-shaped expansion joint by arranging a connecting plate, a first reinforcement member and a second reinforcement member, and absorb part of the deformation of the bottom plate through the elastic deformation of the upper end of the groove structure, thereby preventing excessive internal stress from damaging the bottom plate and the groove structure, thereby ensuring the safe and stable operation of the molten salt storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of a molten salt storage tank provided in an embodiment of the utility model;

[0031] Figure 2 A schematic diagram of the structure of the groove provided in the embodiment of the utility model;

[0032] Figure 3 A top view of a groove provided in an embodiment of the utility model;

[0033] Figure 4 A schematic diagram of the connection between the connecting plate and the groove wall provided in an embodiment of the utility model;

[0034] Figure 5 A schematic diagram of the connection between the groove wall and the groove bottom provided in an embodiment of the utility model.

[0035] Reference numerals:

[0036] 1. Molten salt storage tank, 11. Connecting plate; 12. Tank wall; 13. Second reinforcement; 14. Tank bottom; 15. First reinforcement; 16. Bottom plate; 2. Support foundation; 21. Flexible material; 22. Support layer; 23. Insulation layer; 24. Ring wall; 25. Concrete ring beam; 26. Foundation bottom plate; 3. Molten salt pump. DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with embodiments, but the present invention is not limited to these embodiments.

[0038] The present invention provides a molten salt storage tank for efficiently loading liquid molten salt, such as Figures 1 to 3 As shown, the molten salt storage tank 1 comprises:

[0039] A tank body having an opening at a bottom end;

[0040] The bottom plate 16 is connected to the bottom of the tank body and is used to close the opening; the bottom plate 16 is provided with a groove protruding outward in a direction away from the tank body; the groove is used to accommodate the suction end of the molten salt pump 3 of the molten salt storage tank 1; there is a gap between the notch edge of the groove and the bottom plate 16;

[0041] The connecting plate 11 is connected between the notch edge of the groove and the bottom plate 16 to close the gap.

[0042] By providing a groove on the bottom plate 16 of the molten salt storage tank 1 and placing the suction end of the molten salt pump 3 in the groove, the amount of ineffective molten salt can be reduced from the amount required to cover the entire bottom plate 16 to only the amount required to fill the groove, thereby achieving a significant reduction in the amount of ineffective molten salt and effectively improving the utilization rate of the molten salt. At the same time, by providing a groove to load ineffective molten salt, the loading amount of ineffective molten salt in the molten salt storage tank 1 is reduced, thereby achieving a reduction in the tank wall height and capacity under the same heat storage power, greatly saving the construction cost of the molten salt storage tank 1.

[0043] Specifically, Figure 3 As shown, the bottom plate 16 in this embodiment is circular, the groove is an arc-shaped groove, and the center of the arc-shaped groove coincides with the center of the bottom plate 16. The notch of the arc-shaped groove has four sides, including two arc-shaped sides and two straight sides. There is a gap between the four sides and the bottom plate 16, and the connecting plate 11 connects the four sides of the notch to the corresponding positions of the bottom plate 16 respectively.

[0044] Specifically, the number of the connecting plates 11 in this embodiment is four, and the four connecting plates 11 respectively match the two arcuate sides and the two straight sides of the arcuate groove, that is, the two connecting plates 11 connecting the two arcuate sides are both arc-shaped, and the curvatures match the inner and outer curvatures of the arcuate groove respectively; the two connecting plates 11 connecting the two straight sides are both rectangular, and the lengths match the lengths of the straight sides of the arcuate groove respectively. The thickness of the connecting plates 11 can be consistent with that of the bottom plate 16, and the material can be the same as that of the bottom plate 16.

[0045] Specifically, the groove may include:

[0046] A groove wall 12, the upper end of which is connected to the connecting plate 11;

[0047] The groove bottom 14 is connected to the lower end of the groove wall 12 .

[0048] It is worth noting that the height between the top of the tank wall 12 and the tank bottom 14 should meet the height of the safety protection liquid level required for the stable operation of the molten salt pump 3, and the height is generally 0.7-1.2 m.

[0049] Specifically, the groove wall 12 is a vertical straight wall plate with an arc-shaped cross section. Its thickness may be 1.5 to 2.0 times the thickness of the connecting plate 11 , and its material may be the same as that of the bottom plate 16 .

[0050] Specifically, the groove bottom 14 is a transverse flat plate and is in an arc shape matching the cross section of the groove wall 12 . Its thickness may be 2.0 to 2.5 times the thickness of the connecting plate 11 , and its material may be the same as that of the bottom plate 16 .

[0051] In this embodiment, the opening formed at the upper end of the groove wall 12 is the groove. Figure 2 and Figure 4As shown, the four connecting plates 11 are all located above the bottom plate 16 and the tank wall 12. One end of each connecting plate 11 is welded to the bottom plate 16 by a lap weld, and the other end is welded to the upper end of the tank wall 12 by a penetration weld. Adjacent connecting plates 11 are welded in pairs, and the tank bottom 14 and the tank wall 12 are welded by a butt weld. The above welding points should be welded continuously without interruption. Continuous welding can form a continuous weld to ensure the sealing of the molten salt storage tank 1 and prevent leakage of molten salt.

[0052] By welding the connecting plate 11 to the upper end of the groove wall 12, the structural strength of the upper end of the groove wall 12 can be strengthened. When the bottom plate 16 undergoes radial expansion and contraction deformation due to temperature changes, the upper end of the groove wall 12 can move as a whole with the expansion and contraction of the bottom plate 16, thereby preventing the upper end of the groove wall 12 from excessive bending deformation and fracture damage.

[0053] In practice, sufficient molten salt flow space should be reserved in the groove to ensure the normal operation of the molten salt pump 3, so the radial width of the arc-shaped groove should be greater than the diameter of the suction end of the molten salt pump 3. In this embodiment, the radial width of the groove wall 12 and the groove bottom 14 is 300 to 500 mm larger than the diameter of the suction end of the molten salt pump 3.

[0054] Specifically, the groove may also include:

[0055] The first reinforcement member 15 is fixedly disposed at the connection between the groove wall 12 and the groove bottom 14 , and is used to limit the lateral deformation of the groove bottom 14 .

[0056] By providing the first reinforcement member 15 , the structural strength of the groove bottom 14 can be effectively enhanced, and excessive deformation of the groove bottom 14 due to temperature change can be avoided, thereby improving the structural stability of the groove bottom 14 .

[0057] Specifically, the first reinforcement member 15 can be two unequal-sided arc angle steels, which are respectively arranged at two arc-shaped seams between the groove wall 12 and the groove bottom 14 , and the curvatures thereof match the curvatures of the two arc-shaped seams.

[0058] In this embodiment, if Figure 2 As shown, the arc-shaped joint between the groove bottom 14 and the groove wall 12 is at a certain distance from the bottom end of the groove wall 12, that is, the groove wall 12 extends downward by a certain distance relative to the groove bottom 14 to form a downward extending portion, and the length of the downward extending portion should be greater than the short side length of the unequal-sided arc angle steel to meet the welding space requirements of the unequal-sided arc angle steel. Specifically, as Figure 5 As shown, the long sides of the two unequal-sided arc angle steels are respectively welded to the lower surface of the groove bottom 14, and the short sides are respectively welded to the downwardly extending portion of the groove wall 12, so that the groove bottom 14 can be effectively strengthened.

[0059] Specifically, the molten salt storage tank 1 may also include:

[0060] The second reinforcing member 13 is disposed at the upper end of the groove wall 12 and fixedly connected to the opposite side walls of the groove wall 12 to define the distance between the opposite side walls.

[0061] Specifically, the second reinforcement member 13 may be an equilateral angle steel, which is arranged along the radial direction of the arc-shaped groove wall 12 , and whose two ends are respectively welded and fixed to two opposite arc-shaped side walls on the groove wall 12 .

[0062] In this embodiment, a plurality of molten salt pumps 3 are evenly distributed in the arc-shaped groove. Accordingly, there may be a plurality of second reinforcement members 13 , and a second reinforcement member 13 may be provided on both sides of each molten salt pump 3 .

[0063] By providing the second reinforcement member 13, on the one hand, the impact force caused by the liquid molten salt on the high-speed running molten salt pump 3 can be effectively alleviated, and on the other hand, the deformation of the upper end of the groove wall 12 due to temperature change can be reduced, thereby playing a role in strengthening the overall strength of the groove structure.

[0064] In practice, the groove structure is fixedly arranged on the support base 2 of the molten salt storage tank 1. Based on the structural setting of the groove, since the first reinforcement 15 strengthens the groove bottom 14, the support base 2 limits the groove bottom 14, the connecting plate 11 strengthens the upper end of the groove wall 12, and the second reinforcement 13 limits the distance between the two arc-shaped side walls of the groove wall 12, when the bottom plate 16 undergoes uneven heat conduction and thermal deformation along the radial direction due to temperature changes, the deformation and displacement occurring at the upper end of the groove structure are respectively greater than the deformation and displacement occurring at the lower end, so that the groove structure has a function similar to that of a U-shaped expansion joint, and can absorb part of the deformation of the bottom plate 16 through the elastic deformation of the upper end of the groove structure, thereby preventing the internal stress from exceeding the limit and causing damage to the bottom plate 16 and the groove structure, and ensuring the safe and stable operation of the molten salt storage tank 1. Among them, the reinforcement effect of the first reinforcement 15 on the groove bottom 14 and the limiting effect of the support base 2 on the groove bottom 14 meet the requirements of the bottom limit of the U-shaped expansion joint.

[0065] Another embodiment of the present invention provides a support foundation for any of the above-mentioned molten salt storage tanks, such as Figure 2 As shown, the support base 2 includes:

[0066] a concrete base having a support trough thereon;

[0067] A heat insulation layer 23 is arranged in the support groove;

[0068] The support layer 22 is arranged on the insulation layer 23 and is located in the support groove, and is used to support the molten salt storage tank 1; a receiving groove matching the groove is opened on the support layer 22, and the receiving groove is used to receive the groove body of the groove;

[0069] The flexible material 21 is filled between the supporting layer 22 and the bottom plate 16 .

[0070] In practice, when the molten salt storage tank 1 is in operation, its bottom plate 16 and the tank wall will undergo multiple expansion and contraction deformations and temperature heat conduction due to temperature changes. Therefore, the supporting foundation 2 of the molten salt storage tank 1 should not only meet the requirements of vertical bearing capacity strength, but also meet the requirements of thermal insulation, deformation stiffness, etc.

[0071] In this embodiment, the flexible material 21 is made of sandy heat-insulating material, for example, quartz sand or ceramsite sand, and the thickness is set to 80-120 mm. By setting the flexible material 21, when the bottom plate 16 undergoes vertical deformation, the particle arrangement of the flexible material 21 can be adjusted accordingly, so that the flexible material 21 always maintains a close contact state with the bottom plate 16, thereby ensuring uniform force transmission; when the bottom plate 16 undergoes horizontal deformation, the flexible material 21 can absorb the horizontal deformation of the upper end of the groove structure due to its low friction coefficient, thereby reducing the internal stress of the bottom plate 16 and protecting the bottom plate 16 structure.

[0072] It is worth noting that, based on the structural setting of the support foundation 2 in this embodiment, the aforementioned connecting plate 11 also has the function of facilitating the construction of the support foundation 2. In practice, this embodiment first constructs the support foundation 2 in the order of the concrete base, the heat insulation layer 23, the supporting layer 22, and the flexible material 21, and then installs the bottom plate 16 and the groove on the flexible material 21. Since the flexible material 21 of this embodiment has fluidity, after installing the bottom plate 16 and the groove, there is still a certain gap between the supporting layer 22 and the groove wall 12 of the groove. At this time, the granular flexible material 21 can be filled into the above gap through the gap between the bottom plate 16 and the groove. After the filling is dense, the two ends of the connecting plate 11 are respectively welded to the bottom plate 16 and the notch of the groove, thereby completing the construction of the support foundation 2 and the installation of the bottom plate 16 of the molten salt storage tank 1.

[0073] Specifically, the support layer 22 is arranged below the flexible material 21, and is made of hard plate insulation material with a thickness of about 150-200 mm. The support layer 22 is the vertical support skeleton of the composite support foundation 2 of this embodiment, and has high compression, folding and bending resistance and good self-supporting performance.

[0074] Specifically, the heat insulation layer 23 is arranged below the support layer 22, and adopts a bulk or medium-hard plate heat insulation material, and the heat insulation layer 23 is wrapped and supported by the concrete base. In this embodiment, the thickness of the heat insulation layer 23 is greater than the thickness of the support layer 22, and greater than the set thickness of the flexible material 21, which can play a better role in heat insulation and heat preservation, so that the residual temperature of the molten salt transferred to the concrete base meets the normal use temperature range of the concrete material, thereby avoiding the high temperature of the molten salt affecting the structural safety of the concrete base, and ensuring the stability and durability of the concrete base.

[0075] Specifically, the concrete foundation may include:

[0076] Basic floor 26;

[0077] The ring wall 24 is connected to the edge of the foundation slab 26 .

[0078] In this embodiment, the foundation slab 26 is a reinforced concrete cylindrical structure, which is provided with a plurality of circumferential steel bars and a plurality of radial steel bars; the ring wall 24 is a reinforced concrete circular ring structure, which is provided with a plurality of vertical steel bars and a plurality of horizontal circumferential steel bars, and the foundation slab 26 and the ring wall 24 are cast as a whole.

[0079] By setting up a concrete base, all loads of the molten salt storage tank 1 can be transferred to the foundation to ensure the stable installation of the molten salt storage tank 1. At the same time, the insulation layer 23, the support layer 22, the flexible material 21 and other layer structures are wrapped together, and the unbalanced internal stress is released through the hierarchical structure to provide stable support for the molten salt storage tank 1.

[0080] Specifically, the support base 2 may also include:

[0081] The concrete ring beam 25 is arranged in the support groove of the concrete base, and its outer wall contacts the inner wall of the support groove, its inner wall contacts the support layer 22, and its bottom wall contacts the insulation layer 23, and is used to support the edge of the bottom plate 16; the flexible material 21 is filled between the bottom plate 16 and the support layer 22 and the concrete ring beam 25.

[0082] Specifically, the concrete ring beam 25 is a heat-resistant concrete flat beam, which is arranged in an overall circular ring shape. In practice, the tank wall of the molten salt storage tank 1 expands and deforms under the pressure and high temperature of the molten salt, causing a sudden change in the internal stress of the foundation structure below the tank wall, and the stress change is complex. This embodiment can better bear the complex internal stress and limit the expansion and deformation of the tank wall by setting a concrete ring beam 25 with a certain rigidity, thereby ensuring the overall safety of the supporting foundation 2 and the molten salt storage tank 1.

[0083] Specifically, the concrete ring beam 25 is disposed below the tank wall of the molten salt storage tank 1, which can strengthen the support for the tank wall. Preferably, when the extension line of the tank wall is located within the 1 / 2 area inside the concrete ring beam 25, the concrete ring beam 25 has a better support for the tank wall.

[0084] Specifically, the concrete ring beam 25 may be made of heat-resistant concrete to ensure reliable and safe force transmission.

[0085] Specifically, in order to ensure that the thickness of the flexible material 21 is uniform and to ensure that the force transmission of the flexible material 21 is uniform, in this embodiment, the upper surface of the concrete ring beam 25 is flush with the upper surface of the supporting layer 22 .

[0086] The above are only a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application is disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technician familiar with the profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A molten salt storage tank for efficiently loading liquid molten salt, characterized in that: The molten salt storage tank comprises: A tank body having an opening at a bottom end; A bottom plate is connected to the bottom of the tank body and is used to close the opening; a groove convex outwardly away from the tank body is provided on the bottom plate; the groove is used to accommodate the suction end of the molten salt pump of the molten salt storage tank; and there is a gap between the notch edge of the groove and the bottom plate; A connecting plate is connected between the notch edge of the groove and the bottom plate and is used to close the gap.

2. The molten salt storage tank according to claim 1, characterized in that: The groove comprises: A groove wall, the upper end of which is connected to the connecting plate; A groove bottom connected to the lower end of the groove wall; The first reinforcement member is fixedly arranged at the connection between the groove wall and the groove bottom, and is used to limit the lateral deformation of the groove bottom.

3. The molten salt storage tank according to claim 2, characterized in that: The molten salt storage tank also includes: The second reinforcing member is arranged at the upper end of the groove wall and fixedly connected to the opposite side walls of the groove wall to limit the distance between the opposite side walls.

4. The molten salt storage tank according to claim 1, characterized in that: The groove is an arc-shaped groove.

5. The molten salt storage tank according to claim 3, characterized in that: The first reinforcement member and the second reinforcement member are both angle steels.

6. A support foundation for a molten salt storage tank according to any one of claims 1 to 5, characterized in that: The supporting foundation includes: a concrete base having a support trough thereon; A heat insulation layer is arranged in the supporting groove; A support layer is arranged on the insulation layer and located in the support groove, and is used to support the molten salt storage tank; a receiving groove matching the groove is opened on the support layer, and the receiving groove is used to receive the groove body of the groove; The flexible material is filled between the supporting layer and the bottom plate.

7. The support foundation according to claim 6, characterized in that: The supporting foundation also includes: A concrete ring beam is arranged in the support groove of the concrete base, and its outer side wall contacts the inner wall of the support groove, its inner side wall contacts the support layer, and its bottom wall contacts the insulation layer, and is used to support the edge of the base plate; the flexible material is filled between the base plate and the support layer and the concrete ring beam.

8. The support foundation according to claim 7, characterized in that: The upper surface of the concrete ring beam is flush with the upper surface of the supporting layer.

9. The support foundation according to claim 6, characterized in that: The heat insulation layer is a bulk material.

10. The support foundation according to claim 6, characterized in that: The flexible material is quartz sand or ceramsite sand.

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