Nuclear power station steam generator compartment main water supply pipeline system and arrangement method thereof

Abstract

The invention discloses a nuclear power station steam generator compartment main water supply pipeline system and an arrangement method thereof.The method comprises the steps that the water outlet end of a main water supply pipeline is connected with a continuous bent pipe, then the continuous bent pipe is connected with a water supply connector of a steam generator, and a compensation unit is formed between the main water supply pipeline and the steam generator in a continuous bent pipe mode; the pipeline thermal displacement and the displacement of the steam generator are compensated. The number of welding seams can be greatly reduced, the welding amount and the engineering amount are reduced, and the installation period is shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear engineering, and particularly relates to a main feed water pipe system in a steam generator compartment of a nuclear power plant and an arrangement method thereof. Background Art

[0002] The main feed water pipe of a nuclear power plant is mainly used to supply feed water to the steam generator. At present, a typical arrangement method of the main feed water pipe of a nuclear power plant is as follows: after the main feed water pipe enters the nuclear island, it is arranged along the annular space and finally enters the steam generator compartment and is welded to the feed water interface of the steam generator. The main feed water pipe belongs to a high-energy pipe and is directly connected to the steam generator, so it is necessary to absorb the thermal displacement of the pipe and the equipment displacement of the steam generator. The traditional main feed water pipe is provided with a compensating bend through an elbow, with a large number of welds, and a large number of brackets need to be set, making the layout design of the main feed water pipe in the evaporator compartment complicated, resulting in a large installation amount, high installation difficulty, and long installation period of the main feed water pipe at the engineering site. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a main feed water pipe system in a steam generator compartment of a nuclear power plant and an arrangement method thereof, which can greatly reduce the number of welds, reduce the welding amount and engineering quantity, and shorten the installation period, aiming at the above deficiencies existing in the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] According to one aspect of the present invention, there is provided an arrangement method of a main feed water pipe system in a steam generator compartment of a nuclear power plant, including:

[0006] Connect a continuous elbow to the water outlet end of the main feed water pipe, and then connect it to the feed water interface of the steam generator through the continuous elbow, so as to form a compensation unit in the form of a continuous elbow between the main feed water pipe and the steam generator to compensate for the thermal displacement of the pipe and the displacement of the steam generator.

[0007] Optionally, the continuous elbow includes a first pipe section, a second pipe section, a third pipe section and a fourth pipe section. One end of the first pipe section is connected to the feed water interface of the steam generator. The second pipe section is connected to the other end of the first pipe section and forms a first bend at the connection. The third pipe section is connected to the other end of the second pipe section and forms a second bend at the connection. The fourth pipe section is connected to the other end of the third pipe section and forms a third bend at the connection. The other end of the fourth pipe section is connected to the water outlet end of the main feed water pipe through a check valve.

[0008] Optionally, the first pipe section and the second pipe section are on the same horizontal plane, the first bend is bent in the horizontal direction, the second pipe section, the third pipe section and the fourth pipe section are all on the same vertical plane, and the fourth pipe section is below the second pipe section, and the second bend and the third bend are both bent in the direction of the vertical plane.

[0009] Optionally, the water outlet end of the main feed water pipe is bent in the horizontal direction to form a fourth bend, and the downstream pipe section of the fourth bend is below the second pipe section, and the extending direction of the upstream pipe section of the fourth bend is opposite to the extending direction of the first pipe section of the continuous elbow.

[0010] Optionally, dampers are respectively arranged on the pipe sections before and after the check valve and on the third pipe section.

[0011] Optionally, an elastic support is arranged outside the continuous elbow.

[0012] According to another aspect of the present invention, there is provided a main feed water pipe system for a nuclear power plant steam generator compartment, including a main feed water pipe and a continuous elbow. The water outlet end of the main feed water pipe is connected to one end of the continuous elbow, and the other end of the continuous elbow is connected to the water inlet interface of the steam generator, so as to form a compensation unit in the form of a continuous elbow between the main feed water pipe and the steam generator to compensate for the thermal displacement of the pipe and the displacement of the steam generator.

[0013] Optionally, the continuous elbow includes a first pipe section, a second pipe section, a third pipe section and a fourth pipe section. One end of the first pipe section is connected to the water inlet interface of the steam generator, the second pipe section is connected to the other end of the first pipe section and forms a first bend at the connection, the third pipe section is connected to the other end of the second pipe section and forms a second bend at the connection, the fourth pipe section is connected to the other end of the third pipe section and forms a third bend at the connection, and the other end of the fourth pipe section is connected to the water outlet end of the main feed water pipe through a check valve.

[0014] Optionally, the first pipe section and the second pipe section are on the same horizontal plane, the first bend is bent in the horizontal direction, the second pipe section, the third pipe section and the fourth pipe section are all on the same vertical plane, and the fourth pipe section is below the second pipe section, and the second bend and the third bend are both bent in the direction of the vertical plane.

[0015] Optionally, the water outlet end of the main feed water pipe is provided with a fourth bend bent in the horizontal direction, and the downstream pipe section of the fourth bend is below the second pipe section, and the extending direction of the upstream pipe section of the fourth bend is opposite to the extending direction of the first pipe section of the continuous elbow.

[0016] Optionally, dampers are respectively arranged outside the pipe sections before and after the check valve and outside the third pipe section.

[0017] Optionally, an elastic support is provided outside the continuous elbow pipe.

[0018] Beneficial effects:

[0019] For the main feed water pipe and its layout method in the steam generator compartment of the nuclear power plant of the present invention, by setting up a continuous elbow pipe to form a compensation unit to compensate for the thermal displacement of the pipe and the displacement of the steam generator. Compared with the prior art, the number of welds in the steam generator compartment can be significantly reduced, the welding amount and the engineering quantity can be reduced, the installation cycle can be shortened, the probability of pipeline system rupture can be reduced, the occurrence of internal disasters caused by the rupture of high-energy pipelines can be avoided, and the emptying of the steam generator caused by the rupture of the pipelines here can be avoided, improving the safety of the pipelines in the steam generator compartment; moreover, the present invention is general and has strong applicability. By adjusting the lengths of the pipe segments and the bending radii of each bend in the continuous elbow pipe, it is applicable to the layout of the main feed water pipes in the steam generator compartments of nuclear power plants under different scenarios. Description of the drawings

[0020] Figure 1 It is a schematic diagram of the main feed water pipe system and its layout method in the steam generator compartment of the nuclear power plant according to the embodiment of the present invention.

[0021] In the figure: 1 - water supply interface of the steam generator; 2 - continuous elbow pipe; 21 - first pipe segment; 22 - second pipe segment; 23 - third pipe segment; 24 - fourth pipe segment; 3 - spring support; 4 - damper; 5 - check valve; 6 - main feed water pipe. Specific embodiments

[0022] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "upper" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification, 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 therefore cannot be understood as a limitation to the present invention.

[0024] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0025] In view of the problems in the prior art that the main feed water pipe in the steam generator compartment of a nuclear power plant is provided with a compensating bend through an elbow, which has a large number of welds, complex design, large installation quantity, high installation difficulty, and long installation cycle, etc., the present invention discloses an arrangement method for the main feed water pipe system in the steam generator compartment of a nuclear power plant, including: connecting a continuous bend at the water outlet end of the main feed water pipe, and then connecting it to the water supply interface of the steam generator through the continuous bend, so as to form a compensation unit in the form of a continuous bend between the main feed water pipe and the steam generator to compensate for the thermal displacement of the pipe and the displacement of the steam generator.

[0026] Correspondingly, the present invention also discloses a main feed water pipe system in the steam generator compartment of a nuclear power plant, including a main feed water pipe and a continuous bend. One end of the continuous bend is connected to the water outlet end of the main feed water pipe, and the other end of the continuous bend is connected to the water supply interface of the steam generator, so as to form a compensation unit in the form of a continuous bend between the main feed water pipe and the steam generator to compensate for the thermal displacement of the pipe and the displacement of the steam generator.

[0027] Embodiment 1

[0028] As Figure 1 shown, this embodiment discloses an arrangement method for the main feed water pipe system in the steam generator compartment of a nuclear power plant, including: connecting a continuous bend 2 at the water outlet end of the main feed water pipe 6, and then directly connecting it to the water supply interface 1 of the steam generator through the continuous bend 2, so as to form a compensation unit in the form of a continuous bend between the main feed water pipe and the steam generator to compensate for the thermal displacement of the pipe and the displacement of the steam generator.

[0029] Specifically, the continuous elbow pipe 2 is arranged in the steam generator compartment. The continuous elbow pipe 2 may include a first pipe section 21, a second pipe section 22, a third pipe section 23, and a fourth pipe section 24. One end of the first pipe section 21 is connected to the feed water interface 1 of the steam generator. One end of the second pipe section 22 is connected to the other end of the first pipe section 21 and forms a first bend at the connection. One end of the third pipe section 23 is connected to the other end of the second pipe section 22 and forms a second bend at the connection. One end of the fourth pipe section 24 is connected to the other end of the third pipe section 23 and forms a third bend at the connection. The other end of the fourth pipe section 24 is connected to the water outlet end of the main feed water pipe 6 through a check valve 5. Among them, the lengths of the pipe sections of the continuous elbow pipe 2 and the bending radii of each bend are specifically selected according to the space size of the steam generation compartment. For example, the bending radii of each bend of the continuous elbow pipe can be 2D, which has good adaptability to stress calculation and space requirements, but is not limited to this.

[0030] In addition, each bend of the continuous elbow pipe 2 is arranged as close as possible to the middle position of the steam generator compartment. For example, the distance between each bend and the partition wall of the compartment can be controlled to be more than 1 meter to ensure the passage of personnel and the arrangement of other items.

[0031] Compared with the prior art, there is no weld in the pipeline (i.e., the continuous elbow pipe 2) between the check valve and the steam generator in this method. From the water outlet end of the main feed water pipe to the feed water interface of the steam generator, at most four circumferential welds are required, which can greatly reduce the number of welds, reduce the welding amount and the engineering quantity, shorten the installation cycle, reduce the probability of pipeline system rupture, avoid internal disasters caused by high-energy pipeline rupture, and avoid the emptying of the steam generator caused by the rupture of the pipeline here.

[0032] In some embodiments, as Figure 1 shown, the first pipe section 21 and the second pipe section 22 are on the same horizontal plane, the first bend is bent along the horizontal direction, the second pipe section 22, the third pipe section 23, and the fourth pipe section 24 are all on the same vertical plane, and the fourth pipe section 24 is below the second pipe section 22. The second bend and the third bend are both bent along the vertical plane direction. Such an arrangement is not only structurally compact and occupies a small space, but also enables the main feed water pipe system of the steam generator to have a certain degree of ability to compensate for the thermal displacement of the pipeline and the displacement of the steam generator in multiple directions such as up, down, left, and right.

[0033] In some embodiments, the water outlet end of the main feed water pipe 6 is bent along the horizontal direction to form a fourth bend, and the downstream pipe section of the fourth bend is below the second pipe section 22, so that the extending direction of the upstream pipe section of the fourth bend is opposite to the extending direction of the first pipe section 21 of the continuous elbow pipe. Such an arrangement is not only structurally compact and occupies a small space, but also enables the main feed water pipe system of the steam generator to have a certain degree of ability to compensate for the thermal displacement of the pipeline and the displacement of the steam generator in the front and rear directions.

[0034] Among them, the bending radius of the fourth bend and the length of the pipe section downstream of the fourth bend are specifically selected according to the space size of the steam generation compartment. For example, the bending radius of the fourth bend can also be 2D, which has good adaptability to stress calculation and space requirements, but is not limited thereto. In addition, the fourth bend is preferably arranged as close as possible to the middle of the steam generator compartment. For example, the distance between the fourth bend and the partition wall of the compartment is controlled to be more than 1 meter to ensure the passage of personnel and the arrangement of other items.

[0035] In some embodiments, dampers 4 are respectively arranged outside the pipe sections before and after the check valve 5 and outside the riser pipe (i.e., the third pipe section 23) in the continuous elbow 2. This can prevent the displacement of the large-mass check valve from exceeding the standard under seismic conditions, limit the seismic load, improve the seismic resistance ability of the main feed water pipeline, and ensure integrity under seismic conditions.

[0036] It should be noted that when the space of the steam generator compartment is insufficient, for example, when the layout position dimension of the riser pipe (i.e., the third pipe section 23) of the continuous elbow 2 is insufficient, this damper can also be cancelled.

[0037] In some embodiments, an elastic support 3 is arranged outside the continuous elbow. Specifically, the elastic support 3 is preferably arranged outside the upper pipe section (such as the second pipe section 22) of the continuous elbow 2. The spring support can support the main feed water pipeline and absorb the displacement in the vertical direction under different working conditions.

[0038] Embodiment 2

[0039] As Figure 1 shown, this embodiment discloses a main feed water pipeline system for a steam generator compartment in a nuclear power plant, which is arranged by using the method described in Embodiment 1. It includes a main feed water pipeline 6 and a continuous elbow 2. The water outlet end of the main feed water pipeline 6 is connected to one end of the continuous elbow 2, and the other end of the continuous elbow 2 is connected to the water supply interface 1 of the steam generator, so as to form a compensation unit in the form of a continuous elbow between the main feed water pipeline and the steam generator to compensate for the thermal displacement of the pipeline and the displacement of the steam generator.

[0040] Specifically, the continuous elbow 2 is arranged in the steam generator compartment. The continuous elbow 2 includes a first pipe section 21, a second pipe section 22, a third pipe section 23, and a fourth pipe section 24. One end of the first pipe section 21 is connected to the feed water interface 1 of the steam generator. The second pipe section 22 is connected to the other end of the first pipe section 21 and forms a first bend at the connection. The third pipe section 23 is connected to the other end of the second pipe section 22 and forms a second bend at the connection. The fourth pipe section 24 is connected to the other end of the third pipe section 23 and forms a third bend at the connection. The other end of the fourth pipe section 24 is connected to the water outlet end of the main feed water pipe 6 through a check valve 5. Among them, the lengths of the pipe sections of the continuous elbow 2 and the bending radii of each bend are specifically selected according to the space size of the steam generation compartment. For example, the bending radii of each bend of the continuous elbow 2 can be 2D, which has good adaptability to stress calculation and space requirements, but is not limited to this.

[0041] Compared with the prior art, there are no welds in the pipeline (i.e., the continuous elbow 2) between the check valve and the steam generator in this system. From the water outlet end of the main feed water pipe to the feed water interface of the steam generator, at most only four circumferential welds are required, which can greatly reduce the number of welds, reduce the welding amount and the amount of work, shorten the installation period, reduce the probability of pipeline system rupture, avoid internal disasters caused by high-energy pipeline rupture, and avoid the emptying of the steam generator caused by pipeline rupture here.

[0042] In some embodiments, each bend of the continuous elbow 2 is arranged as close as possible to the middle of the steam generator compartment. For example, the distances between the first bend, the second bend, and the third bend and the partition wall of the compartment are all controlled to be more than 1 meter to ensure the passage of personnel and the arrangement of other items.

[0043] In some embodiments, as Figure 1 shown, the first pipe section 21 and the second pipe section 22 are on the same horizontal plane, the first bend is bent along the horizontal direction, the second pipe section 22, the third pipe section 23, and the fourth pipe section 24 are all on the same vertical plane, and the fourth pipe section 24 is below the second pipe section 22. The second bend and the third bend are both bent along the vertical plane direction. Such an arrangement not only has a compact structure and small occupied space, but also enables the main feed water pipe system of the steam generator to have a certain degree of ability to compensate for the thermal displacement of the pipeline and the displacement of the steam generator in multiple directions such as up, down, left, and right.

[0044] In some embodiments, the water outlet end of the main feed water pipe 6 is provided with a fourth bend bent along the horizontal direction, and the downstream pipe section of the fourth bend is below the second pipe section 22. The extending direction of the upstream pipe section of the fourth bend is opposite to the extending direction of the first pipe section 21 of the continuous elbow. Such an arrangement not only has a compact structure and small occupied space, but also enables the main feed water pipe system of the steam generator to have a certain degree of ability to compensate for the thermal displacement of the pipeline and the displacement of the steam generator in the front and rear directions.

[0045] In some embodiments, dampers 4 are respectively provided in the front and rear pipe sections of the check valve 5 and the riser pipe (i.e., the third pipe section 23) in the continuous elbow pipe 2, so as to avoid the displacement of the large-mass check valve exceeding the standard under seismic conditions, limit the seismic load, improve the seismic resistance of the main feed water pipeline, and ensure integrity under seismic conditions.

[0046] In some embodiments, an elastic support 3 is provided outside the continuous elbow pipe 2. Specifically, the elastic support 3 is preferably provided outside the upper pipe section (such as the second pipe section 22) of the continuous elbow pipe 2. The spring support can support the main feed water pipeline and absorb the displacement in the vertical direction under different working conditions.

[0047] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present invention. However, the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. An arrangement method for the main feed water pipeline system of the steam generator compartment in a nuclear power plant, characterized in that, Comprising: At the water outlet end of the main feed water pipe (6), a continuous elbow (2) is connected, and then through the continuous elbow to the water inlet of the steam generator, so that a compensation unit is formed between the main feed water pipe and the steam generator in the form of a continuous elbow to compensate for the thermal displacement of the pipe and the displacement of the steam generator.

2. The layout method of the main feed water pipe system in the steam generator compartment of a nuclear power plant according to claim 1, characterized in that, The continuous elbow includes a first pipe section (21), a second pipe section (22), a third pipe section (23) and a fourth pipe section (24). One end of the first pipe section is connected to the water inlet of the steam generator, the second pipe section is connected to the other end of the first pipe section and forms a first bend at the connection. The third pipe section is connected to the other end of the second pipe section and forms a second bend at the connection. The fourth pipe section is connected to the other end of the third pipe section and forms a third bend at the connection, and the other end of the fourth pipe section is connected to the water outlet end of the main feed water pipe through a check valve (5).

3. The layout method of the main feed water pipeline system of the nuclear power plant steam generator compartment according to claim 2, characterized in that The first pipe section and the second pipe section are on the same horizontal plane, and the first bend is bent along the horizontal direction. The second pipe section, the third pipe section and the fourth pipe section are all on the same vertical plane, and the fourth pipe section is below the second pipe section, and the second bend and the third bend are both bent along the vertical plane direction.

4. The arrangement method of the main feed water pipeline system in the steam generator compartment of a nuclear power plant according to claim 3, characterized in that, The water outlet end of the main feed water pipe is bent horizontally to form a fourth bend, and the downstream pipe section of the fourth bend is below the second pipe section, and the extending direction of the upstream pipe section of the fourth bend is opposite to the extending direction of the first pipe section of the continuous elbow.

5. The layout method of the main feed water pipe system for the nuclear power plant steam generator compartment according to any one of claims 2-4, characterized in that Dampers (4) are respectively arranged on the pipe sections before and after the check valve and on the third pipe section.

6. The arrangement method of the main feed water pipeline system in the steam generator compartment of a nuclear power plant according to any one of claims 2-4, characterized in that, An elastic support (3) is arranged outside the continuous elbow.

7. A main feed water pipe system for a steam generator compartment of a nuclear power plant, characterized in that, Including a main feed water pipe (6) and a continuous elbow (2). The water outlet end of the main feed water pipe is connected to one end of the continuous elbow, and the other end of the continuous elbow is connected to the water inlet of the steam generator, so that a compensation unit is formed between the main feed water pipe and the steam generator in the form of a continuous elbow to compensate for the thermal displacement of the pipe and the displacement of the steam generator.

8. The main feed water pipe system of the nuclear power plant steam generator compartment according to claim 7, wherein, The continuous elbow includes a first pipe section (), a second pipe section (), a third pipe section () and a fourth pipe section (). One end of the first pipe section is connected to the water inlet of the steam generator, the second pipe section is connected to the other end of the first pipe section and forms a first bend at the connection. The third pipe section is connected to the other end of the second pipe section and forms a second bend at the connection. The fourth pipe section is connected to the other end of the third pipe section and forms a third bend at the connection, and the other end of the fourth pipe section is connected to the water outlet end of the main feed water pipe through a check valve (5).

9. The main feed water pipe system for the steam generator compartment of a nuclear power plant according to claim 8, wherein, The first pipe section and the second pipe section are on the same horizontal plane, and the first bend is bent along the horizontal direction. The second pipe section, the third pipe section and the fourth pipe section are all on the same vertical plane, and the fourth pipe section is below the second pipe section, and the second bend and the third bend are both bent along the vertical plane direction.

10. The main feed water pipe system for the steam generator compartment of a nuclear power plant according to claim 9, characterized in that, The water outlet end of the main feed water pipe is provided with a fourth bend bent horizontally, and the downstream pipe section of the fourth bend is below the second pipe section, and the extending direction of the upstream pipe section of the fourth bend is opposite to the extending direction of the first pipe section of the continuous elbow.

11. The main feed water pipe system for the steam generator compartment of a nuclear power plant according to any one of claims 8-10, characterized in that, A damper (4) is respectively arranged outside the front and rear pipe sections of the check valve and outside the third pipe section.

12. The main feed water pipe system for the steam generator compartment of a nuclear power plant according to any one of claims 8-10, characterized in that, An elastic support (3) is arranged outside the continuous elbow pipe.

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