Secondary side partition plate limiting and supporting structure of steam generator

Abstract

The invention belongs to the technical field of nuclear reactor systems, and particularly relates to a steam generator secondary side partition plate limiting and supporting structure. According to the device, a bottom limiting seat module is fixedly installed at the center of a tube plate of the steam generator, a secondary side partition plate is placed on the surface of a secondary side tube roadway area of the tube plate of the steam generator through the bottom limiting seat module, and the bottom limiting seat module is connected with the secondary side surface of the tube plate in a welded mode; the two side faces of the secondary side partition plate and the inner wall of a tube bundle sleeve of the steam generator are fixed and limited through side face limiting groove modules. A transverse tube supporting plate is arranged in the center of the tube bundle sleeve, and the secondary side partition plate penetrates through the multiple layers of tube supporting plates located on the lower portion of the tube bundle and is in mutual limiting supporting with the tube supporting plates through the middle supporting limiting module. The supporting device is used for effectively and stably supporting the secondary side partition plate and the tube bundle supporting plate, and the problems that deformation is not coordinated due to thermal expansion, and gaps of supporting parts are not stable are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear reactor systems, and particularly relates to a limit support structure for the secondary side partition plate of a steam generator. Background Art

[0002] The new type of high-efficiency steam generator adopts the design of an axial flow preheater to enhance heat transfer. This design puts forward new requirements for the structure of the rising channel in the tube bundle area on the secondary side of the steam generator. In order to create a fully countercurrent fluid distribution state of the feed water on the cold side of the tube bundle, the steam generator with an axial flow preheater is provided with a secondary side partition plate in the tube gallery area of the tube bundle. The existence of this partition plate divides the original circular tube support plates of each layer into two semi-circular support plates. In order to still ensure the effective support of the tube bundle and avoid the support instability caused by factors such as improper assembly, thermal expansion, and flow-induced vibration, it is necessary to innovatively and reasonably design the support limit structure between the secondary side partition plate and its associated structures. Summary of the Invention

[0003] The technical problem solved by the present invention: Provide a limit support structure for the secondary side partition plate of a steam generator, which is used to achieve effective and stable support for the secondary side partition plate itself and the tube bundle support plate, and at the same time avoid the problems of inconsistent deformation caused by thermal expansion and unstable gaps at the support parts from the design structure, and can effectively avoid the risk of improper installation during the equipment manufacturing and installation process.

[0004] The technical solution adopted by the present invention:

[0005] A limit support structure for the secondary side partition plate of a steam generator includes a secondary side partition plate, a bottom limit seat module, a side limit groove module, and an intermediate support limit module. The bottom limit seat module is fixedly installed at the center of the tube sheet of the steam generator. The secondary side partition plate is placed on the surface of the secondary side tube alley area of the tube sheet of the steam generator through the bottom limit seat module, and the bottom limit seat module is welded to the secondary side surface of the tube sheet; the two sides of the secondary side partition plate are fixedly limited with the inner wall of the tube bundle sleeve of the steam generator through the side limit groove module; a horizontal tube support plate is provided at the center of the tube bundle sleeve. The secondary side partition plate passes through multiple layers of tube support plates located below the tube bundle and is mutually limited and supported with the tube support plate through the intermediate support limit module.

[0006] The bottom limit seat module is a Y-shaped support groove, the secondary side partition plate is inserted into the Y-shaped support groove, and a plurality of bottom limit wedges are provided in the gap between the Y-shaped support groove and the secondary side partition plate.

[0007] The groove width of the Y-shaped support groove is greater than the thickness of the secondary side partition plate, and the bottom limit wedges eliminate the gap between the Y-shaped support groove and the secondary side partition plate.

[0008] The side limit groove module includes 9 sub-modules with the same structure, each module includes a pair of first wedge-shaped slot bars and a pair of first wedge-shaped slot bars, the first wedge-shaped slot bars are welded to the inner wall of the tube bundle sleeve, the secondary side partition plate is inserted into the first wedge-shaped slot bar, and the gap between the first wedge-shaped slot bar and the secondary side partition plate is provided with a first wedge-shaped slot bar.

[0009] The width of the first wedge-shaped slot strip is greater than the thickness of the secondary side partition plate.

[0010] The first wedge-shaped slot strips are welded and fixed to the first wedge-shaped slot strips.

[0011] At the position of each layer of pipe support plate, wedge-shaped limiting submodules are symmetrically arranged on both sides of the secondary side partition plate, and each submodule includes a second wedge-shaped slot strip and a second wedge-shaped adjustment block. The second wedge-shaped slot strip contacts the secondary side partition plate, and the second wedge-shaped adjustment block contacts and cooperates with the slot strip.

[0012] The second wedge-shaped adjustment block is fixed to the slot bar by welding.

[0013] Each component in the bottom limit seat module, the side limit groove module and the middle support limit module is made of the same carbon steel material as the steam generator tube bundle sleeve.

[0014] The secondary side partition plate is made of nickel-based material.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The present invention provides a steam generator secondary partition plate limit support structure, which can achieve effective and stable support of the secondary partition plate and the tube bundle. At the same time, this structure does not limit the expansion or contraction displacement of the secondary partition plate in all directions within the plane, reducing the risk of effectiveness caused by thermal stress. This structure does not require high parts processing accuracy and low installation difficulty, and is easy to implement.

[0017] (2) The steam generator secondary side partition plate limiting support structure provided by the present invention has low requirements on parts processing accuracy and installation difficulty, is easy to implement, and has high engineering feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The same reference numerals are used in these drawings to represent the same or similar parts. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0019] Figure 1 A schematic diagram of a limiting support structure of a secondary side partition plate of a steam generator provided by the present invention.

[0020] Figure 2 It is a schematic structural diagram of the bottom limit seat module.

[0021] Figure 3 It is a schematic structural diagram of the side limit groove module.

[0022] Figure 4 It is a schematic structural diagram of the middle support limit module.

[0023] In the figure: 1. Secondary side partition plate, 2. Bottom limit seat module, 3. Side limit groove module, 4. Middle support limit module, 5. Lower cylinder of steam generator, 6. Tube support plate, 7. Tube bundle sleeve, 8. Tube sheet, 9. Bottom limit wedge, 10. Y-shaped support groove, 11. First wedge-shaped card slot strip, 12. First wedge-shaped adjustment block, 13. Second wedge-shaped card slot strip, 14. Second wedge-shaped adjustment block. Specific implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] Such as Figure 1As shown in the figure, a steam generator secondary side partition limiting and supporting structure provided by the present invention includes: a secondary side partition 1, a bottom limiting seat module 2, a side limiting groove module 3, and an intermediate supporting and limiting module 4. The bottom limiting seat module 2 is fixedly installed at the center of the tube sheet 8 of the steam generator.

[0028] The secondary side partition 1 is placed on the surface of the secondary side tube lane area of the steam generator tube sheet through the bottom limiting seat module 2, and the bottom limiting seat module 2 is welded to the secondary side surface of the tube sheet 8.

[0029] As Figure 2 shown, the bottom limiting seat module 2 is a Y-shaped support groove 10. The groove width of the Y-shaped support groove 10 is greater than the thickness of the secondary side partition 1. The secondary side partition 1 is inserted into the Y-shaped support groove 10. A plurality of bottom limiting wedges 9 are provided in the gap between the Y-shaped support groove 10 and the secondary side partition 1. The bottom limiting wedges 9 eliminate the gap between the Y-shaped support groove 10 and the secondary side partition 1, ensuring complete limitation of the secondary side partition 1 in the thickness direction while not restricting in-plane displacement.

[0030] Both sides of the secondary side partition 1 are fixedly limited by the side limiting groove module 3 and the inner wall of the tube bundle sleeve 7 of the steam generator.

[0031] As Figure 3 shown, the side limiting groove module 3 includes 9 sub-modules with the same structure. Each module includes a pair of first wedge-shaped card slots 12 and a pair of first wedge-shaped card slots 11. The first wedge-shaped card slots 12 are welded to the inner wall of the tube bundle sleeve 7. The width of the first wedge-shaped card slots 12 is greater than the thickness of the secondary side partition 1. The secondary side partition 1 is inserted into the first wedge-shaped card slots 12. A first wedge-shaped card slot 11 is provided in the gap between the first wedge-shaped card slots 12 and the secondary side partition 1. After the gap is eliminated by the first wedge-shaped card slot 11 and finally adjusted in place, the first wedge-shaped card slot 11 is welded and fixed to the first wedge-shaped card slot 12, ultimately achieving complete limitation of the secondary side partition 1 in the thickness direction while not restricting in-plane displacement.

[0032] A transverse tube support plate 6 is provided at the center of the tube bundle sleeve 7. The secondary side partition 1 passes through multiple layers of tube support plates 6 located below the tube bundle and is mutually limited and supported with the tube support plate 6 through the intermediate support and limit module 4.

[0033] As Figure 4As shown in the figure, at the position of the tube support plate 6 of each layer, wedge-shaped limiting sub-modules are symmetrically arranged on both sides of the secondary side partition plate 1. Each sub-module includes a second wedge-shaped card slot strip 13 and a second wedge-shaped adjustment block 14. The second wedge-shaped card slot strip 13 is in contact with the secondary side partition plate 1, and the second wedge-shaped adjustment block 14 is in contact and cooperation with the card slot strip 13 to eliminate the gap between the card slot strip 13 and the tube support plate 1. After the final adjustment is in place, the second wedge-shaped adjustment block 14 is welded and fixed to the card slot strip 13, so as to realize the complete limit of the secondary side partition plate in the thickness direction, while not restricting the in-plane displacement.

[0034] The intermediate support limiting module 4 also realizes the complete limit of the corresponding tube support plate 6 of each layer in the in-plane diameter direction, while not restricting the up and down movement of the tube support plate caused by the thermal expansion and contraction of the tube bundle.

[0035] All parts in the bottom limiting seat module 2, the side limiting groove module 3, and the intermediate support limiting module 4 are made of the same carbon steel material as the steam generator tube bundle sleeve 7.

[0036] The secondary side partition plate 1 is made of nickel-based material.

[0037] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0038] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A steam generator secondary side partition plate limiting support structure, characterized in that: The invention comprises a secondary side partition plate (1), a bottom limit seat module (2), a side limit groove module (3), and an intermediate support limit module (4); the bottom limit seat module (2) is fixedly installed at the center of the tube sheet (8) of the steam generator; the secondary side partition plate (1) is placed on the surface of the secondary side pipe lane area of ​​the tube sheet of the steam generator through the bottom limit seat module (2); the bottom limit seat module (2) is welded to the secondary side surface of the tube sheet (8); the two side surfaces of the secondary side partition plate (1) are fixedly limited with the inner wall of the tube bundle sleeve (7) of the steam generator through the side limit groove module (3); a transverse tube support plate (6) is provided at the center of the tube bundle sleeve (7); the secondary side partition plate (1) passes through the multi-layer tube support plates (6) located at the lower part of the tube bundle, and is mutually limited and supported with the tube support plates (6) through the intermediate support limit module (4).

2. The steam generator secondary side partition plate limiting support structure according to claim 1, characterized in that: The bottom limit seat module (2) is a Y-shaped bracket (10), the secondary side partition plate (1) is inserted into the Y-shaped bracket (10), and a plurality of bottom limit wedge blocks (9) are provided in the gap between the Y-shaped bracket (10) and the secondary side partition plate (1).

3. The steam generator secondary side partition plate limiting support structure according to claim 2, characterized in that: The groove width of the Y-shaped bracket (10) is greater than the thickness of the secondary side partition plate (1), and the bottom limiting wedge block (9) eliminates the gap between the Y-shaped bracket (10) and the secondary side partition plate (1).

4. The steam generator secondary side partition plate limiting support structure according to claim 1, characterized in that: The side limit groove module (3) comprises 9 submodules of the same structure, each module comprising a pair of first wedge-shaped slot bars (12) and a pair of first wedge-shaped slot bars (11), the first wedge-shaped slot bars (12) being welded to the inner wall of the tube bundle sleeve (7), the secondary side partition plate (1) being inserted into the first wedge-shaped slot bar (12), and the first wedge-shaped slot bar (11) being provided in the gap between the first wedge-shaped slot bar (12) and the secondary side partition plate (1).

5. The steam generator secondary side partition plate limiting support structure according to claim 4, characterized in that: The width of the first wedge-shaped slot strip (12) is greater than the thickness of the secondary side partition plate (1).

6. The steam generator secondary side partition plate limiting support structure according to claim 4, characterized in that: The first wedge-shaped slot strip (11) and the first wedge-shaped slot strip (12) are fixed by welding.

7. The steam generator secondary side partition plate limiting support structure according to claim 1, characterized in that: At the position of each layer of the tube support plate (6), wedge-shaped limiting submodules are symmetrically arranged on both sides of the secondary side partition plate (1), and each submodule comprises a second wedge-shaped slot strip (13) and a second wedge-shaped adjustment block (14); the second wedge-shaped slot strip (13) is in contact with the secondary side partition plate (1), and the second wedge-shaped adjustment block (14) is in contact with the slot strip (13).

8. The steam generator secondary side partition plate limiting support structure according to claim 7, characterized in that: The second wedge-shaped adjustment block (14) is fixed to the clamping groove bar (13) by welding.

9. The steam generator secondary side partition plate limiting support structure according to claim 1, characterized in that: Each component in the bottom limit seat module (2), the side limit groove module (3) and the middle support limit module (4) is made of the same carbon steel material as the steam generator tube bundle sleeve (7).

10. The steam generator secondary side partition plate limiting support structure according to claim 1, characterized in that: The secondary side partition plate (1) is made of nickel-based material.

Images