A nuclear reactor pressure vessel bolt hole overlay heating apparatus and method

Abstract

The application provides a nuclear reactor pressure vessel bolt hole surfacing heating device and method, and relates to the technical field of heating equipment.The nuclear reactor pressure vessel bolt hole surfacing heating device comprises a first electromagnetic induction heating device, a second electromagnetic induction heating device and a support cross beam.The two ends of the support cross beam are respectively slidably connected with the first electromagnetic induction heating device and the second electromagnetic induction heating device.The curvature of the end face of the first electromagnetic induction heating device facing the outer wall of the nuclear reactor pressure vessel is configured to match the curvature of the outer wall of the nuclear reactor pressure vessel.The curvature of the end face of the second electromagnetic induction heating device facing the inner wall of the nuclear reactor pressure vessel is configured to match the curvature of the inner wall of the nuclear reactor pressure vessel.The nuclear reactor pressure vessel bolt hole surfacing heating device can effectively improve the problem of low thermal efficiency of the nuclear reactor pressure vessel bolt hole during heating.

Description

Technical Field

[0001] This invention relates to the field of heating equipment technology, and more specifically, to a heating device and method for welding bolt holes in a nuclear reactor pressure vessel. Background Technology

[0002] Currently, the nuclear reactor pressure vessel is an important piece of equipment in a nuclear power plant. The quality of the welding of the main bolt holes is related to whether the reactor pressure vessel can be opened and closed normally. Therefore, during production, austenitic stainless steel is usually welded on the inner wall of the main bolt holes near the orifice on the nuclear reactor pressure vessel to cope with the aging or deterioration of stainless steel that may occur during long-term operation.

[0003] In the existing technology, when performing welding operations at the bolt holes of a nuclear reactor pressure vessel, the welding position needs to be heated. The traditional heating method is gas combustion heating, which has low heating efficiency. Summary of the Invention

[0004] The problem addressed by this invention is how to improve the low thermal efficiency of bolt holes in nuclear reactor pressure vessels during heating.

[0005] In a first aspect, the present invention provides a heating device for welding bolt holes in a nuclear reactor pressure vessel, comprising a first electromagnetic induction heating device, a second electromagnetic induction heating device, and a supporting beam; both ends of the supporting beam are slidably connected to the first electromagnetic induction heating device and the second electromagnetic induction heating device, respectively; the first electromagnetic induction heating device and the second electromagnetic induction heating device are configured to jointly heat the bolt holes located between them; the curvature of the end face of the first electromagnetic induction heating device facing the outer wall of the nuclear reactor pressure vessel is configured to match the curvature of the outer wall of the nuclear reactor pressure vessel; the curvature of the end face of the second electromagnetic induction heating device facing the inner wall of the nuclear reactor pressure vessel is configured to match the curvature of the inner wall of the nuclear reactor pressure vessel.

[0006] Optionally, the nuclear reactor pressure vessel bolt hole welding heating device further includes a first fastener; the two ends of the supporting beam are respectively provided with a first through-hole; the first electromagnetic induction heating device and the second electromagnetic induction heating device are both provided with a first connection hole; the first fastener passes through the first through-hole and connects to the first connection hole, so that the supporting beam is connected to the first electromagnetic induction heating device or the second electromagnetic induction heating device.

[0007] Optionally, the heating device for welding the bolt holes of the nuclear reactor pressure vessel further includes a first rolling element, which is rotatably connected to the support beam and configured to roll into contact with the end face of the nuclear reactor pressure vessel where the bolt holes are located.

[0008] Optionally, the heating device for welding bolt holes of the nuclear reactor pressure vessel further includes a second rolling element; both the first electromagnetic induction heating device and the second electromagnetic induction heating device are rotatably connected to the second rolling element; the second rolling element on the first electromagnetic induction heating device is configured to roll in contact with the outer wall of the nuclear reactor pressure vessel; the second rolling element on the second electromagnetic induction heating device is configured to roll in contact with the inner wall of the nuclear reactor pressure vessel.

[0009] Optionally, the first electromagnetic induction heating device is connected to the second rolling element at its opposite ends; and / or, the second electromagnetic induction heating device is connected to the second rolling element at its opposite ends.

[0010] Optionally, the second rolling element on the first electromagnetic induction heating device is configured to slide relative to the first electromagnetic induction heating device to adjust the distance between the first electromagnetic induction heating device and the outer wall of the nuclear reactor pressure vessel.

[0011] And / or, the second rolling element on the second electromagnetic induction heating device is configured to slide relative to the second electromagnetic induction heating device to adjust the distance between the second electromagnetic induction heating device and the inner wall of the nuclear reactor pressure vessel.

[0012] Optionally, the nuclear reactor pressure vessel bolt hole welding heating device further includes a first bracket and a second fastener; one end of the first bracket is provided with a through second oblong hole; the first electromagnetic induction heating device or the second electromagnetic induction heating device is provided with a second connecting hole; the second fastener passes through the second oblong hole and connects to the second connecting hole, so that the first bracket is connected to the first electromagnetic induction heating device or the second electromagnetic induction heating device.

[0013] Optionally, the first electromagnetic induction heating device includes a first mounting frame and an air-cooled induction heating cable; the air-cooled induction heating cable is coiled inside the first mounting frame; the curvature of the end face of the first mounting frame facing the outer wall of the nuclear reactor pressure vessel is configured to match the curvature of the outer wall of the nuclear reactor pressure vessel; the first mounting frame is connected to the support beam.

[0014] Optionally, the second electromagnetic induction heating device includes a second mounting bracket and a water-cooled induction heating cable; the water-cooled induction heating cable is coiled inside the second mounting bracket; the curvature of the end face of the second mounting bracket facing the inner wall of the nuclear reactor pressure vessel is configured to match the curvature of the inner wall of the nuclear reactor pressure vessel; the second mounting bracket is connected to the support beam.

[0015] Secondly, the present invention provides a method for heating bolt holes in a nuclear reactor pressure vessel for welding, using the aforementioned heating device for heating bolt holes in a nuclear reactor pressure vessel, comprising:

[0016] At least one of the above-mentioned nuclear reactor pressure vessel bolt hole welding heating devices is installed on the nuclear reactor pressure vessel, such that the first electromagnetic induction heating device faces the outer wall of the nuclear reactor pressure vessel, and the second electromagnetic induction heating device faces the inner wall of the nuclear reactor pressure vessel.

[0017] Adjust the fixed positions of the first electromagnetic induction heating device and the second electromagnetic induction heating device on the support beam so that the distance between the first electromagnetic induction heating device and the outer wall of the nuclear reactor pressure vessel reaches a first preset distance, and the distance between the second electromagnetic induction heating device and the inner wall of the nuclear reactor pressure vessel reaches a second preset distance.

[0018] The first electromagnetic induction heating device and the second electromagnetic induction heating device are powered on so that the first electromagnetic induction heating device and the second electromagnetic induction heating device together heat the bolt hole located between them.

[0019] When the temperature of the inner wall of the bolt hole to be welded reaches the welding temperature, welding is performed at the position of the bolt hole to be welded, and the first electromagnetic induction heating device and the second electromagnetic induction heating device maintain the interlayer temperature of the welding.

[0020] After the welding is completed at the location to be welded in the bolt hole, the temperature of the first electromagnetic induction heating device and the second electromagnetic induction heating device is adjusted to the post-weld heat treatment temperature and kept at that temperature.

[0021] After the preset heat preservation time, the heating device for welding the bolt holes of the nuclear reactor pressure vessel is removed from the nuclear reactor pressure vessel.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The two ends of the supporting beam are slidably connected to the first and second electromagnetic induction heating devices, respectively. This allows for adjustment of the positions of the first and second electromagnetic induction heating devices on the supporting beam, accommodating nuclear reactor pressure vessels with different wall thicknesses. This ensures that the first electromagnetic induction heating device maintains a suitable distance from the outer wall of the nuclear reactor pressure vessel, and that the second electromagnetic induction heating device maintains a suitable distance from the inner wall of the nuclear reactor pressure vessel, thereby facilitating effective heating by the first and second electromagnetic induction heating devices. The first and second electromagnetic induction heating devices are configured as follows: The bolt holes located between the two devices are heated together. The curvature of the end face of the first electromagnetic induction heating device facing the outer wall of the nuclear reactor pressure vessel is configured to match the curvature of the outer wall of the nuclear reactor pressure vessel. This ensures uniform heating of the outer wall of the nuclear reactor pressure vessel during heating by the first electromagnetic induction heating device, thereby effectively improving heating efficiency. Similarly, the curvature of the end face of the second electromagnetic induction heating device facing the inner wall of the nuclear reactor pressure vessel is configured to match the curvature of the inner wall of the nuclear reactor pressure vessel. This ensures uniform heating of the inner wall of the nuclear reactor pressure vessel during heating by the second electromagnetic induction heating device, thereby effectively improving heating efficiency. In summary, the nuclear reactor pressure vessel bolt hole welding heating device of the present invention can effectively improve the problem of low thermal efficiency during heating of the bolt holes of nuclear reactor pressure vessels. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the heating device for welding bolt holes in a nuclear reactor pressure vessel according to an embodiment of the present invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of the heating device for welding bolt holes in a nuclear reactor pressure vessel according to an embodiment of the present invention. Figure 2 ;

[0026] Figure 3 This is an exploded schematic diagram of the heating device for welding bolt holes in a nuclear reactor pressure vessel according to an embodiment of the present invention.

[0027] Figure 4 This is a diagram showing the usage status of the welding heating device for bolt holes in a nuclear reactor pressure vessel according to an embodiment of the present invention.

[0028] Figure 5 This is a schematic flowchart of the heating method for welding bolt holes in a nuclear reactor pressure vessel according to an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100. First electromagnetic induction heating device; 101. First mounting bracket; 102. Air-cooled induction heating cable; 200. Second electromagnetic induction heating device; 201. Second mounting bracket; 202. Water-cooled induction heating cable; 300. Support beam; 301. First oblong hole; 400. First fastener; 500. First rolling element; 600. Second rolling element; 700. First bracket; 701. Second oblong hole; 800. Second fastener; 900. First connecting hole; 110. Second connecting hole; 120. First mating part; 130. Second mating part; 140. Nuclear reactor pressure vessel; 150. Bolt hole. Detailed Implementation

[0031] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0032] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0033] It should be noted that the terms "one" and "more" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0034] like Figure 1 , 2As shown, an embodiment of the present invention provides a heating device for welding bolt holes in a nuclear reactor pressure vessel, including a first electromagnetic induction heating device 100, a second electromagnetic induction heating device 200, and a supporting beam 300; both ends of the supporting beam 300 are slidably connected to the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200, respectively; the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 are configured to jointly heat the bolt hole 150 located between them; the curvature of the end face of the first electromagnetic induction heating device 100 facing the outer wall of the nuclear reactor pressure vessel 140 is configured to match the curvature of the outer wall of the nuclear reactor pressure vessel 140; the curvature of the end face of the second electromagnetic induction heating device 200 facing the inner wall of the nuclear reactor pressure vessel 140 is configured to match the curvature of the inner wall of the nuclear reactor pressure vessel 140.

[0035] Specifically, the support beam 300 is elongated, with its two ends slidably connected to the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200, respectively. This allows for adjustment of the positions of the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 on the support beam 300, adapting to nuclear reactor pressure vessels 140 with different wall thicknesses. This ensures that the first electromagnetic induction heating device 100 maintains a suitable distance from the outer wall of the nuclear reactor pressure vessel 140, and that the second electromagnetic induction heating device 200 maintains a suitable distance from the inner wall of the nuclear reactor pressure vessel 140, thereby facilitating effective heating of both the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200.

[0036] Specifically, after the heating device for welding the bolt holes of the nuclear reactor pressure vessel is installed on the nuclear reactor pressure vessel 140, its entire structure straddles the nuclear reactor pressure vessel 140, with the following effect: Figure 4As shown; at this time, the first electromagnetic induction heating device 100 is located outside the nuclear reactor pressure vessel 140 and faces the outer wall of the nuclear reactor pressure vessel 140; the second electromagnetic induction heating device 200 is located inside the nuclear reactor pressure vessel 140 and faces the inner wall of the nuclear reactor pressure vessel 140; the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 are configured to jointly heat the bolt hole 150 located between them, wherein the curvature of the end face of the first electromagnetic induction heating device 100 facing the outer wall of the nuclear reactor pressure vessel 140 is configured to... The curvature of the second electromagnetic induction heating device 200 is configured to match the curvature of the outer wall of the nuclear reactor pressure vessel 140. This ensures uniform heating of the outer wall of the nuclear reactor pressure vessel 140 during heating by the first electromagnetic induction heating device 100, thereby effectively improving heating efficiency. Similarly, the curvature of the end face of the second electromagnetic induction heating device 200 facing the inner wall of the nuclear reactor pressure vessel 140 is configured to match the curvature of the inner wall of the nuclear reactor pressure vessel 140. This also ensures uniform heating of the inner wall of the nuclear reactor pressure vessel 140 during heating by the second electromagnetic induction heating device 200, thereby effectively improving heating efficiency.

[0037] In summary, the heating device for welding bolt holes of the nuclear reactor pressure vessel in this embodiment can effectively improve the problem of low thermal efficiency in the bolt holes 150 of the nuclear reactor pressure vessel 140 during heating.

[0038] In this embodiment, the number of supporting beams 300 is not limited; it can be one, two, or three, etc., depending on actual needs.

[0039] Optionally, the nuclear reactor pressure vessel bolt hole welding heating device further includes a first fastener 400; the two ends of the supporting beam 300 are respectively provided with a through first oblong hole 301; the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 are both provided with a first connecting hole 900; the first fastener 400 passes through the first oblong hole 301 and connects to the first connecting hole 900, so that the supporting beam 300 is connected to the first electromagnetic induction heating device 100 or the second electromagnetic induction heating device 200.

[0040] like Figure 3As shown, the support beam 300 is elongated, with a first oblong hole 301 extending through both ends of its length direction, and the extension direction of the first oblong hole 301 is parallel to the length direction of the support beam 300; the top of the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 are both provided with a first mating part 120, and the first mating part 120 is provided with a first connecting hole 900, which is a threaded hole; the first fastener 400 is a bolt, which passes through the first oblong hole 301 and is threadedly connected to the first connecting hole 900, so that the support beam 300 is connected to the first electromagnetic induction heating device 100 or the second electromagnetic induction heating device 200.

[0041] In this optional embodiment, the design of the first waist-shaped hole 301 on the support beam 300 not only facilitates the passage of the first fastener 400, but also allows the position of the first electromagnetic induction heating device 100 or the second electromagnetic induction heating device 200 on the support beam 300 to be changed by adjusting the relative positional relationship between the first waist-shaped hole 301 and the first fastener 400.

[0042] In other embodiments, the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 can be slidably connected to the support beam 300 by means of a T-shaped slider and a T-shaped groove, and locked by static friction.

[0043] Optionally, the heating device for welding the bolt holes of the nuclear reactor pressure vessel further includes a first rolling element 500, which is rotatably connected to the support beam 300. The first rolling element 500 is configured to make rolling contact with the end face of the nuclear reactor pressure vessel 140 where the bolt holes 150 are located.

[0044] Specifically, the number of the first rolling element 500 can be one, two, or three, etc., without limitation, depending on actual needs. For example... Figure 3 As shown, the first rolling element 500 is a roller, and there are two of them. The two first rolling elements 500 are rotatably mounted on the lower end face of the support beam 300.

[0045] In this optional embodiment, after the heating device for welding the bolt holes of the nuclear reactor pressure vessel is installed, the first rolling element 500 can roll into contact with the end face of the nuclear reactor pressure vessel 140 where the bolt holes 150 are opened. For example, when the bolt holes 150 are opened on the upper end face of the nuclear reactor pressure vessel 140, the support beam 300 can be supported on the upper end face of the nuclear reactor pressure vessel 140 by the first rolling element 500. Since the first rolling element 500 can roll into contact with the end face of the nuclear reactor pressure vessel 140 where the bolt holes 150 are opened, the friction between the two can be effectively reduced, which facilitates the subsequent movement of the heating device for welding the bolt holes of the nuclear reactor pressure vessel on the nuclear reactor pressure vessel 140.

[0046] Optionally, the heating device for welding bolt holes of the nuclear reactor pressure vessel further includes a second rolling element 600; both the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 are rotatably connected to the second rolling element 600; the second rolling element 600 on the first electromagnetic induction heating device 100 is configured to roll in contact with the outer wall of the nuclear reactor pressure vessel 140; the second rolling element 600 on the second electromagnetic induction heating device 200 is configured to roll in contact with the inner wall of the nuclear reactor pressure vessel 140.

[0047] In this optional embodiment, the second rolling element 600 is a roller; due to the presence of the second rolling element 600, the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 can be stably supported, thereby reducing the probability of the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 shaking. At the same time, in conjunction with the first rolling element 500 on the support beam 300, the reliable movement of the nuclear reactor pressure vessel bolt hole welding heating device can be achieved.

[0048] Optionally, the first electromagnetic induction heating device 100 is connected to the second rolling element 600 at opposite ends; and / or, the second electromagnetic induction heating device 200 is connected to the second rolling element 600 at opposite ends.

[0049] Specifically, such as Figure 3 As shown, both the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 are generally arc-shaped plate structures; second rolling elements 600 are respectively provided on both sides along the circumferential direction. In this way, when the heating device for welding the bolt holes of the nuclear reactor pressure vessel is moved on the nuclear reactor pressure vessel 140, the second rolling elements 600 on the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 can move stably.

[0050] In other embodiments, second rolling elements 600 may also be provided at the upper and lower ends of the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200.

[0051] Optionally, the second rolling element 600 on the first electromagnetic induction heating device 100 is configured to slide relative to the first electromagnetic induction heating device 100 to adjust the distance between the first electromagnetic induction heating device 100 and the outer wall of the nuclear reactor pressure vessel 140.

[0052] And / or, the second rolling element 600 on the second electromagnetic induction heating device 200 is configured to slide relative to the second electromagnetic induction heating device 200 to adjust the distance between the second electromagnetic induction heating device 200 and the inner wall of the nuclear reactor pressure vessel 140.

[0053] In this optional embodiment, the second rolling element 600 on the first electromagnetic induction heating device 100 is slidably connected to the first electromagnetic induction heating device 100 and can move toward or away from the outer wall of the nuclear reactor pressure vessel 140 to adjust the distance between the first electromagnetic induction heating device 100 and the outer wall of the nuclear reactor pressure vessel 140. The second rolling element 600 on the second electromagnetic induction heating device 200 is slidably connected to the second electromagnetic induction heating device 200 and can move toward or away from the inner wall of the nuclear reactor pressure vessel 140, thereby adjusting the distance between the second electromagnetic induction heating device 200 and the inner wall of the nuclear reactor pressure vessel 140.

[0054] Optionally, the nuclear reactor pressure vessel bolt hole welding heating device further includes a first bracket 700 and a second fastener 800; one end of the first bracket 700 is provided with a through second oblong hole 701; the first bracket 700 is rotatably connected to the second rolling element 600; the first electromagnetic induction heating device 100 or the second electromagnetic induction heating device 200 is provided with a second connecting hole 110; the second fastener 800 passes through the second oblong hole 701 and connects to the second connecting hole 110, so that the first bracket 700 is connected to the first electromagnetic induction heating device 100 or the second electromagnetic induction heating device 200.

[0055] Specifically, the first bracket 700 is L-shaped, with a through second oblong hole 701 in its longer section and a second rolling element 600 rotatably connected to its shorter section; both the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 have a second mating part 130 on their circumferential side ends, and the first mating part 120 has a second connecting hole 110, which is a threaded hole; the second fastener 800 is a bolt, which passes through the second oblong hole 701 and is threadedly connected to the second connecting hole 110, so that the first bracket 700 is connected to the first electromagnetic induction heating device 100 or the second electromagnetic induction heating device 200.

[0056] In this optional embodiment, the design of the waist-shaped hole on the first bracket 700 not only facilitates the passage of the second fastener 800, but also allows the position of the first bracket 700 on the first electromagnetic induction heating device 100 or the second electromagnetic induction heating device 200 to be changed by adjusting the relative position of the second waist-shaped hole 701 and the second fastener 800, thereby causing a change in the position of the second rolling element 600, and ultimately achieving the purpose of adjusting the distance between the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200.

[0057] In other embodiments, the first bracket 700 can be slidably connected to the first electromagnetic induction heating device 100 or the second electromagnetic induction heating device 200 by means of a T-shaped slider and a T-shaped groove, and locked by static friction.

[0058] Optionally, the first electromagnetic induction heating device 100 includes a first mounting frame 101 and an air-cooled induction heating cable 102; the air-cooled induction heating cable 102 is coiled inside the first mounting frame 101; the curvature of the end face of the first mounting frame 101 facing the outer wall of the nuclear reactor pressure vessel 140 is configured to match the curvature of the outer wall of the nuclear reactor pressure vessel 140; the first mounting frame 101 is connected to the support beam 300.

[0059] Optionally, the second electromagnetic induction heating device 200 includes a second mounting bracket 201 and a water-cooled induction heating cable 202; the water-cooled induction heating cable 202 is coiled inside the second mounting bracket 201; the curvature of the end face of the second mounting bracket 201 facing the inner wall of the nuclear reactor pressure vessel 140 is configured to match the curvature of the inner wall of the nuclear reactor pressure vessel 140; the second mounting bracket 201 is connected to the support beam 300.

[0060] Embodiments of the present invention provide a method for heating the bolt holes of a nuclear reactor pressure vessel for welding, using the heating device for welding bolt holes of a nuclear reactor pressure vessel as described above, such as... Figure 5 As shown, it includes:

[0061] S100. Install at least one of the above-mentioned nuclear reactor pressure vessel bolt hole welding heating devices on the nuclear reactor pressure vessel 140, such that the first electromagnetic induction heating device 100 faces the outer wall of the nuclear reactor pressure vessel 140, and the second electromagnetic induction heating device 200 faces the inner wall of the nuclear reactor pressure vessel 140.

[0062] In this embodiment, the number of heating devices for welding the bolt holes of the nuclear reactor pressure vessel is not specifically limited and is determined according to actual needs. After the heating devices for welding the bolt holes of the nuclear reactor pressure vessel are installed on the nuclear reactor pressure vessel 140, they straddle the nuclear reactor pressure vessel 140 as a whole. At this time, the first electromagnetic induction heating device 100 is located on the outside of the nuclear reactor pressure vessel 140 and faces the outer wall of the nuclear reactor pressure vessel 140; the second electromagnetic induction heating device 200 is located on the inside of the nuclear reactor pressure vessel 140 and faces the inner wall of the nuclear reactor pressure vessel 140.

[0063] S200. Adjust the fixed positions of the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 on the support beam 300 so that the distance between the first electromagnetic induction heating device 100 and the outer wall of the nuclear reactor pressure vessel 140 reaches a first preset distance, and the distance between the second electromagnetic induction heating device 200 and the inner wall of the nuclear reactor pressure vessel 140 reaches a second preset distance.

[0064] In this embodiment, after the heating device for welding the bolt holes of the nuclear reactor pressure vessel is installed on the nuclear reactor pressure vessel 140, it is necessary to adjust the positions of the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 so that the distance between the first electromagnetic induction heating device 100 and the outer wall of the nuclear reactor pressure vessel 140 reaches a first preset distance, and the distance between the second electromagnetic induction heating device 200 and the inner wall of the nuclear reactor pressure vessel 140 reaches a second preset distance, thereby achieving reliable heating; wherein, the first preset distance and the second preset distance can generally be 0 to 2 cm.

[0065] S300: Control the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 to be energized so that the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 together heat the bolt hole 150 located between them.

[0066] In this embodiment, the first electromagnetic induction heating device 100 heats the outer wall of the nuclear reactor pressure vessel 140. Since the outer wall of the nuclear reactor pressure vessel 140 is made of low alloy steel, the first electromagnetic induction heating device 100 needs to be connected to a carbon steel induction heating power supply. The second electromagnetic induction heating device 200 heats the inner wall of the nuclear reactor pressure vessel 140. Since the inner wall of the nuclear reactor pressure vessel 140 is made of stainless steel, the second electromagnetic induction heating device 200 needs to be connected to a stainless steel induction heating power supply.

[0067] S400. When the temperature of the inner wall of the bolt hole 150 to be welded reaches the welding temperature, welding is performed at the position of the bolt hole 150 to be welded, and the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 maintain the interlayer temperature of the welding.

[0068] In this embodiment, the welding temperature is 350 degrees Celsius; the interpass temperature ranges from 150 to 250 degrees Celsius.

[0069] S500: After the welding is completed at the location to be welded in the bolt hole 150, adjust the temperature of the first electromagnetic induction heating device 100 and the second electromagnetic induction heating device 200 to the post-weld heat treatment temperature and keep them warm.

[0070] In this embodiment, the post-weld heat treatment temperature ranges from 250 to 350 degrees Celsius. The insulation method involves covering the welded area with insulating cotton to prevent heat loss.

[0071] S600. After the preset heat preservation time, the heating device for welding the bolt holes of the nuclear reactor pressure vessel is removed from the nuclear reactor pressure vessel 140.

[0072] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A nuclear reactor pressure vessel bolt hole overlay heating device, characterized by, The first electromagnetic induction heating device (100), the second electromagnetic induction heating device (200) and the support beam (300) are included; the two ends of the support beam (300) are respectively connected with the first electromagnetic induction heating device (100) and the second electromagnetic induction heating device (200) in a sliding mode; the first electromagnetic induction heating device (100) and the second electromagnetic induction heating device (200) are configured to heat the bolt hole (150) located between them; the curvature of the end face of the first electromagnetic induction heating device (100) towards the outer wall of the nuclear reactor pressure vessel (140) is configured to match the curvature of the outer wall of the nuclear reactor pressure vessel (140); the curvature of the end face of the second electromagnetic induction heating device (200) towards the inner wall of the nuclear reactor pressure vessel (140) is configured to match the curvature of the inner wall of the nuclear reactor pressure vessel (140); The first fastener (400), the first rolling member (500) and the second rolling member (600) are further included; the two ends of the support beam (300) are respectively provided with a first waist-shaped hole (301) penetrating through; the first electromagnetic induction heating device (100) and the second electromagnetic induction heating device (200) are both provided with a first connecting hole (900); the support beam (300) is in a strip shape, and the extension direction of the first waist-shaped hole (301) is parallel to the length direction of the support beam (300); the first fastener (400) is connected with the first connecting hole (900) through the first waist-shaped hole (301), so that the support beam (300) is connected with the first electromagnetic induction heating device (100) or the second electromagnetic induction heating device (200); the first rolling member (500) is rotationally connected with the support beam (300), and the first rolling member (500) is configured to be in rolling contact with the end face of the nuclear reactor pressure vessel (140) where the bolt hole (150) is opened; the first electromagnetic induction heating device (100) and the second electromagnetic induction heating device (200) are both rotationally connected with the second rolling member (600); the second rolling member (600) on the first electromagnetic induction heating device (100) is configured to be in rolling contact with the outer wall of the nuclear reactor pressure vessel (140); the second rolling member (600) on the second electromagnetic induction heating device (200) is configured to be in rolling contact with the inner wall of the nuclear reactor pressure vessel (140).

2. The nuclear reactor pressure vessel bolt hole overlay heating apparatus of claim 1, wherein, The opposite two side ends of the first electromagnetic induction heating device (100) are respectively connected with the second rolling member (600); and / or, the opposite two side ends of the second electromagnetic induction heating device (200) are respectively connected with the second rolling member (600).

3. The nuclear reactor vessel bolt hole overlay heating apparatus of claim 2, wherein, The second rolling member (600) on the first electromagnetic induction heating device (100) is configured to slide relative to the first electromagnetic induction heating device (100) to adjust the distance between the first electromagnetic induction heating device (100) and the outer wall of the nuclear reactor pressure vessel (140); And / or, the second rolling member (600) on the second electromagnetic induction heating device (200) is configured to slide relative to the second electromagnetic induction heating device (200) to adjust the distance between the second electromagnetic induction heating device (200) and the inner wall of the nuclear reactor pressure vessel (140).

4. The nuclear reactor pressure vessel bolt hole overlay heating apparatus of claim 3, wherein, Further comprising a first support (700) and a second fastener (800); one end of the first support (700) is provided with a second waist-shaped hole (701) penetrating through; the first electromagnetic induction heating device (100) or the second electromagnetic induction heating device (200) is provided with a second connecting hole (110); the second fastener (800) passes through the second waist-shaped hole (701) and is connected with the second connecting hole (110), so that the first support (700) is connected with the first electromagnetic induction heating device (100) or the second electromagnetic induction heating device (200).

5. The nuclear reactor pressure vessel bolt hole overlay heating apparatus of claim 1, wherein, The first electromagnetic induction heating device (100) comprises a first mounting rack (101) and an air-cooled induction heating cable (102); the air-cooled induction heating cable (102) is coiled in the first mounting rack (101); the curvature of the end face of the first mounting rack (101) towards the outer wall of the nuclear reactor pressure vessel (140) is configured to match the curvature of the outer wall of the nuclear reactor pressure vessel (140); the first mounting rack (101) is in sliding connection with the support cross beam (300).

6. The nuclear reactor pressure vessel bolt hole overlay heating apparatus of claim 1, wherein, The second electromagnetic induction heating device (200) comprises a second mounting rack (201) and a water-cooled induction heating cable (202); the water-cooled induction heating cable (202) is coiled in the second mounting rack (201); the curvature of the end face of the second mounting rack (201) towards the inner wall of the nuclear reactor pressure vessel (140) is configured to match the curvature of the inner wall of the nuclear reactor pressure vessel (140); the second mounting rack (201) is in sliding connection with the support cross beam (300).

7. A nuclear reactor pressure vessel bolt hole overlay heating method applying the nuclear reactor pressure vessel bolt hole overlay heating apparatus according to any one of claims 1 to 6, characterized by: Comprise: At least one nuclear reactor pressure vessel bolt hole surfacing heating device is installed on the nuclear reactor pressure vessel (140), so that the first electromagnetic induction heating device (100) faces the outer wall of the nuclear reactor pressure vessel (140), and the second electromagnetic induction heating device (200) faces the inner wall of the nuclear reactor pressure vessel (140); Adjusting the first electromagnetic induction heating device (100) and the second electromagnetic induction heating device (200) in the fixed position of the support beam (300), so that the distance between the first electromagnetic induction heating device (100) and the outer wall of the nuclear reactor pressure vessel (140) reaches the first preset distance, and the distance between the second electromagnetic induction heating device (200) and the inner wall of the nuclear reactor pressure vessel (140) reaches the second preset distance; Controlling the first electromagnetic induction heating device (100) and the second electromagnetic induction heating device (200) to be powered on, so that the first electromagnetic induction heating device (100) and the first electromagnetic induction heating device (100) jointly heat the bolt hole (150) located therebetween; When the temperature of the inner wall of the bolt hole (150) to be surfacing reaches the surfacing temperature, surfacing is performed at the surfacing position of the bolt hole (150), and the first electromagnetic induction heating device (100) and the second electromagnetic induction heating device (200) are kept at the interlayer temperature of the welding layer; After the surfacing at the surfacing position of the bolt hole (150) is completed, the temperature of the first electromagnetic induction heating device (100) and the second electromagnetic induction heating device (200) is adjusted to the post-weld heat treatment temperature, and the heat preservation is performed; After the preset time of heat preservation, the nuclear reactor pressure vessel bolt hole surfacing heating device is removed from the nuclear reactor pressure vessel (140).

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