Compensation ring electrode assembly for important service water system of nuclear power plant

Abstract

The utility model discloses a compensation ring electrode assembly for an important service water system of a nuclear power plant, which comprises a compensation ring body, an auxiliary anode and a reference electrode, and the compensation ring body is provided with a first through hole and a second through hole; each auxiliary anode comprises an arc-shaped anode body and an anode tail column connected with the anode body, the anode tail columns penetrate through the first through holes, and the parts, protruding out of the first through holes, of the anode tail columns are fixed through first nuts; the reference electrode is in a rod shape and penetrates through the second through hole, and the part, protruding out of the second through hole, of the reference electrode is fixed through a second nut. The compensation ring electrode assembly for the important service water system of the nuclear power plant is easy to install and convenient to implement, the cathode protection effect of the tail end of a main pipeline of the important service water system can be greatly improved, the corrosion failure risk of the tail end of the main pipeline of the important service water system is reduced, the reliability of the important service water system is guaranteed, and the safety and stability of a unit are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to a compensating ring electrode assembly for an important service water system of a nuclear power plant. Background Art

[0002] Cathodic protection, as a common method for preventing and mitigating corrosion of protected structures, is widely used in production and life. Similarly, in nuclear power plants, cathodic protection plays a very important role in some seawater systems with harsh environmental conditions. Among them, impressed current cathodic protection is used in the main pipeline of the important service water system.

[0003] Impressed current cathodic protection usually consists of three parts: an auxiliary anode, a reference electrode, and a DC power supply. Currently, in the important service water system of a nuclear power plant, the auxiliary anode and the reference electrode are arranged on the main pipeline of the important service water system. An auxiliary anode is arranged at intervals along the main pipeline, and multiple reference electrodes are arranged along the main pipeline. The auxiliary anode is used to emit current, and the reference electrode is used to collect the protection potential signal to control the output of the DC power supply. The three work together to keep the main pipeline in a good protection state. The end of the main pipeline is connected to the downstream pipeline through a compensating ring, which belongs to the boundary of cathodic protection and is usually a weak area of cathodic protection, extremely prone to corrosion. In severe cases, the end of the main pipeline corrodes and perforates, making the important service water system unavailable and affecting the safe and stable operation of the nuclear power unit. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a compensating ring electrode assembly for an important service water system of a nuclear power plant.

[0005] The technical solution adopted by the utility model to solve its technical problems is to construct a compensating ring electrode assembly for an important service water system of a nuclear power plant, including a compensating ring body, a plurality of auxiliary anodes, and at least one reference electrode. The compensating ring body is provided with a plurality of first through holes penetrating its radial side surface and at least one second through hole;

[0006] The plurality of auxiliary anodes are arranged at intervals along the circumferential direction of the inner side surface of the compensating ring body. Each auxiliary anode includes an arc-shaped anode body and an anode tail post connected to the anode body. The anode tail post penetrates through the first through hole, and the part of the anode tail post protruding from the first through hole is fixed by a first nut;

[0007] The reference electrode is in a rod shape, penetrates through the second through hole, and the part of the reference electrode protruding from the second through hole is fixed by a second nut.

[0008] In some embodiments, the number of the auxiliary anodes is four.

[0009] In some embodiments, the reference electrode is arranged in parallel with at least one of the anode tail posts.

[0010] In some embodiments, external threads are provided on at least a part of the outer peripheral surface of the anode tail post.

[0011] In some embodiments, external threads are provided on at least a part of the outer peripheral surface of the reference electrode.

[0012] In some embodiments, the anode tail post is arranged at the central position of the anode body.

[0013] In some embodiments, the anode tail post is cylindrical.

[0014] In some embodiments, the auxiliary anode is of an integral structure.

[0015] In some embodiments, a slotted crosshead is provided on one side of the reference electrode located radially inside the compensation ring body.

[0016] In some embodiments, the reference electrode is made of zinc.

[0017] Implementing the present utility model has the following beneficial effects: By applying the compensation ring electrode assembly for the important service water system of a nuclear power plant, the compensation ring that traditionally only solves problems such as pipeline thermal expansion and contraction, displacement, and vibration can be equipped with the functions of outputting cathodic protection current and monitoring protection potential. Its installation is simple and the implementation is convenient, which can greatly improve the cathodic protection effect at the end of the main pipeline of the important service water system, reduce the risk of corrosion failure at the end of the main pipeline of the important service water system, ensure the reliability of the important service water system, and improve the safety and stability of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the present utility model, the present utility model will be further described below in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0019] Figure 1 is a schematic structural diagram of a compensation ring electrode assembly for an important service water system of a nuclear power plant in some embodiments of the present utility model;

[0020] Figure 2 is Figure 1 a sectional view of the compensation ring electrode assembly for the important service water system of a nuclear power plant in [reference to the figure number] along the line A-A;

[0021] Figure 3 is Figure 2Cross-sectional view of the compensating ring electrode assembly for the important component cooling water system in a nuclear power plant along line B-B;

[0022] Figure 4 is Figure 2 Cross-sectional view of the compensating ring electrode assembly for the important component cooling water system in a nuclear power plant along line C-C;

[0023] Figure 5 is one of the schematic structural diagrams of the auxiliary anode in some embodiments of the present invention;

[0024] Figure 6 is another schematic structural diagram of the auxiliary anode in some embodiments of the present invention;

[0025] Figure 7 is one of the schematic structural diagrams of the reference electrode in some embodiments of the present invention;

[0026] Figure 8 is another schematic structural diagram of the reference electrode in some embodiments of the present invention. Detailed implementation manners

[0027] For a clearer understanding of the technical features, objectives, and effects of the present invention, the detailed implementation manners of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings and are constructed and operated in a specific orientation, and are only for the convenience of describing the technical solution, rather than indicating that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0028] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installation", "connection", "linkage", "fixation", "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. When a component is referred to as "on" or "under" another component, the component can be "directly" or "indirectly" located above the other component, or there may also be one or more intermediate components. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. can explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are presented to thoroughly understand the embodiments of the present utility model. However, those skilled in the art should clearly understand that the present utility model can also be implemented in other embodiments without these specific details. In other cases, the detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present utility model.

[0030] Referring to Figures 1 to 8 , the present utility model shows a compensating ring electrode assembly for an important component service water system in a nuclear power plant, which enables the compensating ring that traditionally only solves problems such as thermal expansion and contraction, displacement, and vibration of pipelines to have the functions of outputting cathodic protection current and monitoring protection potential. Its installation is simple and the implementation is convenient, which can greatly improve the cathodic protection effect at the end of the main pipeline of the important component service water system, reduce the risk of corrosion failure at the end of the main pipeline of the important component service water system, ensure the reliability of the important component service water system, and improve the safety and stability of the unit.

[0031] The compensating ring electrode assembly for the important component service water system in the nuclear power plant may include a compensating ring body 10, several auxiliary anodes 20, and at least one reference electrode 30. The compensating ring body 10 is generally in a circular ring shape. The compensating ring body 10 is provided with several first through holes penetrating its radial side surface and at least one second through hole. The several first through holes are arranged at intervals along the circumferential direction of the compensating ring body 10, and at least one second through hole is arranged adjacent to and at intervals from at least one first through hole.

[0032] As Figure 1 and Figure 2As shown, a plurality of the auxiliary anodes 20 are arranged at intervals along the circumferential direction of the inner side surface of the compensation ring body 10. Each of the auxiliary anodes 20 includes an arc-shaped anode body 21 and an anode tail post 22 connected to the anode body 21 (as shown in combination with Figure 5 and Figure 6 ). The anode tail post 22 passes through the first through hole, and the part of the anode tail post 22 protruding from the first through hole is fixed by a first nut (not shown). Preferably, the number of the auxiliary anodes 20 is four, and the structures and sizes of the four auxiliary anodes 20 can be set to be the same.

[0033] In some embodiments, the anode tail post 22 is arranged at the central position of the anode body 21.

[0034] In some embodiments, the anode tail post 22 is cylindrical. At least part of the outer peripheral surface of the anode tail post 22 is provided with external threads for threaded connection and fixation with the first nut. The inner cavity of the first through hole can be provided with internal threads or not.

[0035] In some embodiments, the anode body 21 and the inner side surface of the compensation ring body 10 can be connected by sealant. In addition, sealant can be applied to the anode tail post 22 and then inserted into the first through hole, and fastened on the outer side of the compensation ring body 10 with the first nut.

[0036] In some embodiments, the auxiliary anode 20 is of an integral structure. The auxiliary anode 20 can be made of a titanium-based mixed metal oxide with excellent electrochemical performance.

[0037] In some embodiments, a groove can be provided on the inner side surface of the compensation ring body 10, and the anode body 21 is arranged in the groove.

[0038] Understandably, the present application abandons the traditional rod-shaped auxiliary anode structure and avoids opening holes and welding bases on the main pipeline for installation. By using the auxiliary anode 20, the auxiliary anode 20 can be directly combined with the compensation ring body 10.

[0039] As Figure 7 and Figure 8 shown, in some embodiments, the reference electrode 30 is rod-shaped, the reference electrode 30 passes through the second through hole, and the part of the reference electrode 30 protruding from the second through hole is fixed by a second nut.

[0040] Preferably, the reference electrode 30 is arranged in parallel with at least one of the anode tail posts 22 (as shown in Figure 4 ).

[0041] In some embodiments, at least part of the outer peripheral surface of the reference electrode 30 is provided with external threads for threaded connection with the second nut. The inner cavity of the second through hole can be provided with internal threads or not.

[0042] In some embodiments, the reference electrode 30 is provided with a slot 31 on one side of the compensation ring body 10 in the radial direction. Preferably, the reference electrode 30 is made of zinc.

[0043] Understandably, the reference electrode 30 may adopt a slotted bolt structure, with the slotted bolt being located on the inner side of the compensation ring body 10. When the reference electrode 30 is assembled with the compensation ring body 10, a sealant is applied to the outer side of the reference electrode 30, the reference electrode 30 is screwed into the second through hole, and is fastened with a second nut on the outer side of the compensation ring body 10. The reference electrode 30 may be made of high-purity zinc, which has a stable potential in seawater.

[0044] In some embodiments, the first nut and the second nut may be connected to a cathode protection system wiring.

[0045] Understandably, the traditional auxiliary anode and reference electrode are installed on the main pipeline of the important plant water system by opening holes in the pipeline and welding flange bases, which is time-consuming and labor-intensive to install, and there is a risk of loose contact sealing surfaces and water seepage in the main pipeline. The compensation ring electrode assembly for the important plant water system of the nuclear power plant of the present application arranges the auxiliary anode 20 in a ring shape on the inner surface of the compensation ring body 10, and the reference electrode 30 adopts a threaded screw-in design. The auxiliary anode 20, the reference electrode 30 and the compensation ring body 10 are integrally formed. The installation work of the auxiliary anode 20 and the reference electrode 30 is reduced, and the risk of loose sealing and water seepage on the sealing surface is avoided.

[0046] Traditionally, the auxiliary anode and reference electrode are designed and installed separately, and one component can only realize the single function of outputting current or measuring protection potential, while the compensation ring is only used to solve the problems of thermal expansion and contraction, displacement, vibration, etc. of the pipeline. The compensation ring electrode assembly for the important plant water system of the nuclear power plant of the present application integrates the compensation ring body 10 with the auxiliary anode 20 and the reference electrode 30, and increases the functions of outputting cathode protection current and monitoring protection potential without affecting the original functions.

[0047] Traditional auxiliary anode and reference electrode terminals are generally located inside the junction box. The anode cable and the measuring cable need to be inserted from the reserved holes on the top of the junction box, and then the cable terminals are crimped. Finally, the cable terminals are inserted into the terminals and fastened with nuts. The whole process is difficult to operate, time-consuming and labor-intensive, and it is easy to cause the terminals to bend or break. The anode tail column 22 and the reference electrode 30 of the auxiliary anode 20 of the compensation ring electrode assembly for the important plant water system of the nuclear power plant of the present application are both extended out of the compensation ring body 10. The cathode protection system wiring can be simply and firmly connected through the first nut and the second nut, which greatly saves installation and maintenance time. The materials and specifications of the first nut and the second nut can be selected and set according to actual needs, and the nuts of the prior art can be selected, and no specific restrictions are made here.

[0048] Applying the compensating ring electrode assembly for the important component service water system of the nuclear power plant can greatly improve the cathodic protection effect at the end of the main pipeline of the important component service water system, reduce the risk of its corrosion failure, ensure the reliability of the important component service water system, and improve the safety and stability of the unit.

[0049] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A compensation ring electrode assembly for an important plant water system of a nuclear power plant, characterized in that: It comprises a compensation ring body (10), a plurality of auxiliary anodes (20) and at least one reference electrode (30); the compensation ring body (10) is provided with a plurality of first through holes and at least one second through hole penetrating the radial side surface thereof; A plurality of auxiliary anodes (20) are arranged at intervals along the circumferential direction of the inner side surface of the compensation ring body (10), each of the auxiliary anodes (20) comprising an arc-shaped anode body (21) and an anode tail column (22) connected to the anode body (21), the anode tail column (22) being inserted into the first through hole, and a portion of the anode tail column (22) protruding from the first through hole being fixed by a first nut; The reference electrode (30) is rod-shaped, and is inserted into the second through hole. The portion of the reference electrode (30) protruding from the second through hole is fixed by a second nut.

2. The compensation ring electrode assembly for an important plant water system of a nuclear power plant according to claim 1, characterized in that: The number of the auxiliary anodes (20) is four.

3. The compensation ring electrode assembly for an important plant water system of a nuclear power plant according to claim 1, characterized in that: The reference electrode (30) is arranged in parallel with at least one of the anode tail columns (22).

4. The compensation ring electrode assembly for an important plant water system of a nuclear power plant according to claim 1, characterized in that: At least part of the outer peripheral surface of the anode tail column (22) is provided with external threads.

5. The compensation ring electrode assembly for an important plant water system of a nuclear power plant according to claim 1, characterized in that: At least part of the outer peripheral surface of the reference electrode (30) is provided with external threads.

6. The compensation ring electrode assembly for an important plant water system of a nuclear power plant according to claim 1, characterized in that: The anode tail column (22) is arranged at the center of the anode body (21).

7. The compensation ring electrode assembly for an important plant water system of a nuclear power plant according to claim 1, characterized in that: The anode tail column (22) is cylindrical.

8. The compensation ring electrode assembly for an important plant water system of a nuclear power plant according to claim 1, characterized in that: The auxiliary anode (20) is an integrated structure.

9. The compensation ring electrode assembly for an important plant water system of a nuclear power plant according to claim 1, characterized in that: A straight groove (31) is provided on one side of the reference electrode (30) located radially inward of the compensation ring body (10).

10. The compensation ring electrode assembly for an important plant water system of a nuclear power plant according to claim 1, characterized in that: The reference electrode (30) is made of zinc.

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