Built-in immersed electric heater supporting structure of fused salt energy storage equipment

Abstract

The utility model discloses a supporting structure for a built-in immersed electric heater of fused salt energy storage equipment, and relates to the technical field of fused salt energy storage devices and fused salt electric heaters. The utility model solves the problems that the existing fused salt immersed electric heater supporting structure has too many electric heater supports, a backing plate covers a welding seam of a large-scale fused salt energy storage device, and the stress is not uniform due to the single action point of the supporting structure. Two supporting legs are vertically and oppositely arranged above a shell of the immersed electric heater, a supporting pipe which is horizontally arranged is arranged above the two supporting legs, the two ends of the supporting pipe are fixedly connected with the top ends of the two supporting legs respectively, two limiting pipes which are vertically and oppositely arranged are arranged above the supporting pipe, and the bottom ends of the two limiting pipes are fixedly connected with the supporting pipe. The immersed electric heater is horizontally arranged between the two limiting pipes, and the lower surface of the immersed electric heater makes contact with the upper surface of the supporting pipe. The supporting device is used for supporting the immersed electric heater.

Description

TECHNICAL FIELD

[0001] The utility model relates to molten salt energy storage device and molten salt electric heater technical field, concretely relates to a kind of built-in immersion electric heater support structure of molten salt energy storage equipment. BACKGROUND

[0002] As an important branch of long-time energy storage, the characteristics of molten salt energy storage make its application range wide, and its competitive advantage in the field of photothermal power generation and thermal power unit flexibility reconstruction is increasingly prominent. Large-scale molten salt energy storage device is the core device in the new type of power system based on molten salt energy storage. Its basic principle is to use the temperature difference of high and low temperature molten salt in the energy storage device to exchange heat with steam, thereby generating electricity.

[0003] The melting points of binary molten salt and ternary molten salt widely used in large-scale molten salt energy storage device system are very high. If there is no heating source for a long time, molten salt may solidify. The occurrence of molten salt solidification accident is extremely harmful to the entire energy storage system. Therefore, an immersion electric heater must be installed in the large-scale molten salt energy storage device to heat when the salt temperature is too low. The length of this electric heater is generally elongated, and a support structure must be installed at an appropriate position inside to prevent the electric heater from bending, deforming or even collapsing, causing the failure of the electric heater.

[0004] Currently, the electric heater support method used in the industry is generally to use multiple groups of saddle supports to support the electric heater at the bottom of the tank or to pull the electric heater through an angle steel on the pipe wall. Since the number of electric heaters in a general molten salt energy storage device is usually around 8, in the first scheme, the total number of saddle supports will reach dozens, and the problem of interference between the saddle supports and the weld seams of the bottom plate of the molten salt energy storage device often occurs, causing trouble for the design, manufacture and non-destructive testing of the equipment. In the second scheme, pulling the electric heater through an angle steel will make the stress too concentrated, with the weight of the entire electric heater acting on a single point, which is prone to danger. SUMMARY

[0005] The utility model aims at solving the problem of uneven stress caused by excessive electric heater supports, large mat covering the weld seams of large-scale molten salt energy storage device and single support structure action point in the existing molten salt immersion electric heater support structure, and avoiding the problem of uneven stress caused by single support structure action point, and further providing a built-in immersion electric heater support structure for molten salt energy storage equipment.

[0006] The technical solution of the utility model is:

[0007] The application discloses a built-in immersed electric heater support structure of a molten salt energy storage device, and the support structure comprises no less than two electric heater support units, each of which comprises a support pipe 4, two limiting pipes 3 and two legs 5, the two legs 5 are vertically arranged opposite to each other above an immersed electric heater shell, a support pipe 4 is horizontally arranged above the two legs 5, the two ends of the support pipe 4 are fixedly connected with the top ends of the two legs 5, two limiting pipes 3 are vertically arranged opposite to each other above the support pipe 4, the bottom ends of the two limiting pipes 3 are fixedly connected with the support pipe 4, an immersed electric heater 7 is horizontally arranged between the two limiting pipes 3, the inner sides of the two limiting pipes 3 are slidably matched with the sides of the immersed electric heater 7, and the immersed electric heater 7 is arranged on the support pipe 4 and slidably matched with the upper surface of the support pipe 4.

[0008] Further, the electric heater support unit further comprises two inclined support pipes 6, the two inclined support pipes 6 are arranged below the support pipe 4 in an inclined manner, the two inclined support pipes 6 are symmetrically arranged on the two sides of the immersed electric heater 7 with the axis of the immersed electric heater 7 as the center, the top ends of the two inclined support pipes 6 are fixedly connected with the support pipe 4, and the bottom ends of the two inclined support pipes 6 are fixedly connected with the two legs 5 respectively.

[0009] Further, the limiting pipe 3, the support pipe 4, the leg 5 and the inclined support pipe 6 are all circular tubular structures, and the limiting pipe 3, the support pipe 4, the leg 5 and the inclined support pipe 6 are directly welded and fixed, wherein a drainage hole is left at the welding position of each two components, and a gas vent is formed on the top of the enclosed chamber.

[0010] Further, the electric heater support unit further comprises two bottom plate backing plates 1, the two bottom plate backing plates 1 are horizontally arranged below the two legs 5 respectively, the upper surface of the bottom plate backing plate 1 is fixedly connected with the lower surface of the corresponding leg 5, and the lower surface of the bottom plate backing plate 1 is fixedly connected with the inner wall of the large molten salt energy storage device.

[0011] Further, the bottom plate backing plate 1 is a rectangular plate structure, and the outer length of the leg 5 is smaller than the side length of the bottom plate backing plate 1.

[0012] Further, the electric heater support unit further comprises a heater backing plate 2, the heater backing plate 2 is a circular arc plate structure, and the heater backing plate 2 is sleeved outside the immersed electric heater 7.

[0013] Further, the heater backing plate 2 is welded with the immersed electric heater 7.

[0014] Further, the curvature of the heater backing plate 2 is not less than 200 degrees.

[0015] Further, when the number of the electric heater support units is two, one of the electric heater support units is arranged close to the tail end of the immersed electric heater 7, and the other is arranged in the middle of the immersed electric heater 7.

[0016] Further, when the number of the electric heater supporting units is 3, two electric heater supporting units except the tail end support of the submerged electric heater 7 are arranged at the three equal parts along the length of the submerged electric heater 7.

[0017] The utility model has the following effects compared with prior art:

[0018] 1. The utility model solves the problem of excessive support and interference with the complex shell plate of the large-scale molten salt energy storage device caused by the use of multiple groups of saddle supports on each molten salt electric heater, avoids the problem of the difficulty in design, manufacture and detection of the large-scale molten salt energy storage device caused by the covering of the weld by the backing plate.

[0019] 2. The utility model solves the problem of uneven stress and stress concentration of the electric heater in the single tail lifting structure of the electric heater, and avoids the risk of the middle part of the slender electric heater being easily dented and collapsed.

[0020] 3. The utility model solves the problem of excessive internal pressure and even damage caused by the welding construction process of the closed chamber support, greatly improves the safety of the support structure. At the same time, it avoids the problem of molten salt accumulation in the closed vertical support pipe, and avoids the risk of complete drainage and low working liquid level of molten salt.

[0021] 4. The utility model sets two or three electric heater supporting units on each submerged electric heater, increases the number of stress points, and avoids interference with the complex weld of the bottom plate.

[0022] 5. The submerged electric heater support structure of the utility model can also guide the submerged electric heater, increase the limit in the transverse direction of the electric heater, and prevent shaking and transverse movement.

[0023] 6. The material selection of the submerged electric heater support structure of the utility model is the same or similar to that of the molten salt energy storage equipment bottom plate, ensuring consistent expansion coefficient.

[0024] 7. In the submerged electric heater support structure of the utility model, a drainage hole should be left at the welding position of each two components, and a vent hole should be opened at the top of the enclosed chamber to prevent molten salt accumulation and excessive internal pressure in the enclosed chamber. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a front view of a molten salt energy storage equipment built-in submerged electric heater support structure of the utility model;

[0026] Figure 2 is a side view of a molten salt energy storage equipment built-in submerged electric heater support structure of the utility model.

[0027] In the figure: 1, base plate; 2, heater base plate; 3, limiting tube; 4, support tube; 5, support leg; 6, inclined support tube; 7, submerged electric heater. DETAILED DESCRIPTION

[0028] Specific implementation one: combined Figure 1 and Figure 2 This embodiment is a kind of molten salt energy storage equipment built-in submerged electric heater support structure, the support structure includes not less than 2 electric heater support unit, each electric heater support unit includes support tube 4, two limiting tubes 3 and two support legs 5, two support legs 5 are vertically arranged above the shell of submerged electric heater, two support legs 5 are provided with horizontally arranged support tube 4 above, the two ends of support tube 4 are fixedly connected with the top end of two support legs 5, two limiting tubes 3 are vertically arranged above support tube 4, the bottom end of the two limiting tubes 3 is fixedly connected with support tube 4, the submerged electric heater 7 is horizontally arranged between two limiting tubes 3, the inner side of the two limiting tubes 3 is slidably matched with the side of submerged electric heater 7, submerged electric heater 7 is placed on support tube 4, and the upper surface of support tube 4 is slidably matched with the bottom of submerged electric heater 7.

[0029] In this embodiment, the limiting tube 3 plays a guiding role to prevent the lateral displacement of the submerged electric heater 7; the support leg 5 is the main force structure of the middle support structure.

[0030] The material of the molten salt energy storage equipment built-in submerged electric heater support structure is selected from the same or similar material as the base plate of the molten salt energy storage equipment to ensure the consistency of the expansion coefficient.

[0031] Specific implementation two: combined Figure 1 and Figure 2 This embodiment is described, the electric heater support unit of this embodiment further includes two inclined support tubes 6, two inclined support tubes 6 are arranged below support tube 4 along the inclination, two inclined support tubes 6 are symmetrically arranged on both sides of submerged electric heater 7 with submerged electric heater 7 axis as center, the top end of two inclined support tubes 6 is fixedly connected with support tube 4, and the bottom end of two inclined support tubes 6 is fixedly connected with two support legs 5 respectively. By such arrangement, the inclined support tube 6 plays a role in reinforcing the entire support structure to prevent its bending deformation or collapse. The other components and connection relationship are the same as those of specific implementation one.

[0032] Specific implementation three: combined Figure 1 and Figure 2In this embodiment, the limiting tube 3, the supporting tube 4, the supporting leg 5 and the diagonal bracing tube 6 are all circular tube structures, and the limiting tube 3, the supporting tube 4, the supporting leg 5 and the diagonal bracing tube 6 are directly welded and fixed, wherein a drainage hole is left at the welding position of each two components, and a vent hole is opened at the top of the enclosed chamber. In this way, the accumulation of molten salt and the excessive pressure in the enclosed chamber are prevented. The other components and connection relationships are the same as those in the first or second embodiment.

[0033] Embodiment four: combination Figure 1 and Figure 2 In this embodiment, the electric heater supporting unit further comprises two bottom plate backing plates 1, which are arranged horizontally below the two supporting legs 5 respectively, the upper surface of the bottom plate backing plate 1 is fixedly connected with the lower surface of the corresponding supporting leg 5, and the lower surface of the bottom plate backing plate 1 is fixedly connected with the inner wall of the large-scale molten salt energy storage device. In this way, the bottom plate backing plate 1 is welded to the inner wall of the large-scale molten salt energy storage device, which prevents the inner wall of the large-scale molten salt energy storage device from being directly stretched and rubbed by gravity, supporting reaction force and friction force, and avoids mechanical wear and damage. The other components and connection relationships are the same as those in the first, second or third embodiment.

[0034] Embodiment five: combination Figure 1 and Figure 2 In this embodiment, the bottom plate backing plate 1 is a rectangular plate structure, and the outer length of the supporting leg 5 is smaller than the side length of the bottom plate backing plate 1. The other components and connection relationships are the same as those in the first, second, third or fourth embodiment.

[0035] Embodiment six: combination Figure 1 and Figure 2 In this embodiment, the electric heater supporting unit further comprises a heater backing plate 2, which is a circular arc plate structure and is sleeved outside the immersed electric heater 7. In this way, the heater backing plate 2 is not welded with the limiting tube 3, so that the immersed electric heater 7 can expand and slide a short distance in the frame composed of the supporting tube 4 and the limiting tube 3. The other components and connection relationships are the same as those in the first, second, third, fourth or fifth embodiment.

[0036] The immersed electric heater supporting structure built in the molten salt energy storage equipment can guide the immersed electric heater and increase the limiting in the transverse direction of the electric heater to prevent shaking and transverse movement.

[0037] Embodiment seven: combination Figure 1 and Figure 2In this embodiment, the heater pad 2 is welded to the immersed electric heater 7. In this way, the heater pad 2 is welded to the shell of the immersed electric heater 7, preventing the shell of the immersed electric heater from being directly stretched and rubbed by gravity, support reaction force, friction force, and the like, and avoiding mechanical wear and damage. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, or seventh embodiments.

[0038] Eighth embodiment: combination Figure 1 and Figure 2 In this embodiment, the curvature of the heater pad 2 is not less than 200°. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, or seventh embodiments.

[0039] In this embodiment, the curvature of the heater pad 2 is preferably 240°.

[0040] Ninth embodiment: combination Figure 1 and Figure 2 In this embodiment, when the number of electric heater support units is 2, one is arranged near the tail end of the immersed electric heater 7, and the other is arranged in the middle of the immersed electric heater 7. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, seventh, or eighth embodiments.

[0041] Tenth embodiment: combination Figure 1 and Figure 2 In this embodiment, when the number of electric heater support units is 3, in addition to the tail end support of the immersed electric heater 7, the other two electric heater support units are arranged at three equal parts along the length of the immersed electric heater 7. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, seventh, eighth, or ninth embodiments.

[0042] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An in-line immersed electric heater support structure for a molten salt energy storage plant, characterized by: The support structure comprises no less than 2 electric heater support units, each electric heater support unit comprises a support pipe (4), two limiting pipes (3) and two legs (5), the two legs (5) are vertically arranged opposite above the immersion electric heater shell, a horizontally arranged support pipe (4) is arranged above the two legs (5), the two ends of the support pipe (4) are fixedly connected with the top ends of the two legs (5) respectively, two vertically arranged limiting pipes (3) are arranged above the support pipe (4), the bottom ends of the two limiting pipes (3) are fixedly connected with the support pipe (4), the immersion electric heater (7) is horizontally arranged between the two limiting pipes (3), the inner sides of the two limiting pipes (3) are slidably matched with the sides of the immersion electric heater (7), the immersion electric heater (7) is arranged on the support pipe (4), and the upper surface of the support pipe (4) is slidably matched with the bottom of the immersion electric heater (7).

2. The built-in immersed electric heater support structure for molten salt energy storage equipment according to claim 1, characterized in that: The electric heater support unit further comprises two inclined support pipes (6), the two inclined support pipes (6) are arranged below the support pipe (4) in an inclined manner, the two inclined support pipes (6) are symmetrically arranged on the two sides of the immersion electric heater (7) with the axis of the immersion electric heater (7) as the center, the top ends of the two inclined support pipes (6) are fixedly connected with the support pipe (4), and the bottom ends of the two inclined support pipes (6) are fixedly connected with the two legs (5) respectively.

3. The built-in immersed electric heater support structure for molten salt energy storage equipment according to claim 2, characterized in that: The limiting pipe (3), the support pipe (4), the leg (5) and the inclined support pipe (6) are all circular tubular structures, and the limiting pipe (3), the support pipe (4), the leg (5) and the inclined support pipe (6) are directly welded and fixed, wherein a drainage hole is left at the welding position of each two components, and a vent hole is formed in the top of the enclosed chamber.

4. The built-in immersed electric heater support structure of a molten salt energy storage equipment according to claim 3, characterized in that: The electric heater support unit further comprises two bottom plate backing plates (1), the two bottom plate backing plates (1) are horizontally arranged below the two legs (5) respectively, the upper surface of the bottom plate backing plate (1) is fixedly connected with the lower surface of the corresponding leg (5), and the lower surface of the bottom plate backing plate (1) is fixedly connected with the inner wall of the large-scale molten salt energy storage device.

5. The built-in immersed electric heater support structure for molten salt energy storage equipment according to claim 4, characterized in that: The bottom plate backing plate (1) is a rectangular plate structure, and the outer length of the leg (5) is smaller than the side length of the bottom plate backing plate (1).

6. The built-in immersed electric heater support structure of a molten salt energy storage equipment according to claim 5, characterized in that: The electric heater support unit further comprises a heater backing plate (2), the heater backing plate (2) is a circular arc plate structure, and the heater backing plate (2) is sleeved outside the immersion electric heater (7).

7. The built-in immersed electric heater support structure for a molten salt energy storage plant according to claim 6, characterized in that: The heater backing plate (2) is welded and connected with the immersion electric heater (7).

8. The built-in immersed electric heater support structure of a molten salt energy storage equipment according to claim 7, characterized in that: The curvature of the heater backing plate (2) is not less than 200°.

9. The built-in immersed electric heater support structure of a molten salt energy storage equipment according to claim 1 or 8, characterized in that: When the number of electric heater support units is 2, one is arranged near the tail end of the immersion electric heater (7), and the other is arranged in the middle of the immersion electric heater (7).

10. The built-in immersed electric heater support structure of a molten salt energy storage equipment according to claim 9, characterized in that: When the number of electric heater support units is 3, in addition to the support at the tail end of the immersion electric heater (7), the other two electric heater support units are arranged at the three equal parts along the length of the immersion electric heater (7).

Images