CN106340325B

CN106340325B - Joint area structure for joining and looping between vacuum chamber segments of nuclear fusion reactor

Info

Publication number: CN106340325B
Application number: CN201610912496.9A
Authority: CN
Inventors: 覃世军; 陆坤; 徐壮; 吴杰峰; 宋云涛
Original assignee: Hefei Institutes of Physical Science of CAS
Current assignee: Hefei Institutes of Physical Science of CAS
Priority date: 2016-10-19
Filing date: 2016-10-19
Publication date: 2020-04-24
Anticipated expiration: 2036-10-19
Also published as: CN106340325A

Abstract

The invention discloses a seam area structural design for joint looping between vacuum chamber sectors of a nuclear fusion reactor, wherein boundary lines are respectively reserved on T-shaped rib plates of two adjacent sectors of a vacuum chamber assembly sector, the distances between the boundary lines respectively reserved on the T-shaped rib plates of the two sectors and the boundary lines of the sectors are respectively b, b is more than 1.5a, and a is the thickness of a vacuum chamber shell. And simultaneously, boundary lines are respectively reserved on the outer shells of two adjacent sectors of the vacuum chamber assembly sector, and the distances between the boundary lines respectively reserved on the outer shells of the two sectors and the boundary lines of the sectors are respectively c, and (c-b) is more than 1.5 a. The structural design of the joint area of the joint ring between the nuclear fusion reactor vacuum chamber segments can compensate the error of the vacuum chamber shell body during molding, so that the profile error of the whole sector of the nuclear fusion reactor vacuum chamber after the ring formation is controlled within the error allowable range, the cross welding seam in the joint area is avoided, and the welding of the shell body and the T-shaped rib plate can be finished with high quality.

Description

Joint area structure for joining and looping between vacuum chamber segments of nuclear fusion reactor

Technical Field

The invention relates to the technical field of design of a nuclear fusion reactor vacuum chamber, in particular to a seam region structure for joint looping among nuclear fusion reactor vacuum chamber fan sections.

Background

The vacuum chamber of the nuclear fusion reactor is an important core component in a superconducting Tokamak nuclear fusion reactor device, and the vacuum allowable leakage rate of the vacuum chamber reaches 1 x 10^-8Pa∙m³∙s^-1Therefore, each weld needs to be designed and processed according to very strict standards such as preparation before welding, welder qualification, weld leak detection and the like. The height and the large radius of the vacuum chamber can reach more than 10m, and the small radius is about 5m, so that the large double-layer curved surface vacuum container cannot be processed and formed at one time in the existing industrial process level and can only be divided into a plurality of parts and then welded and assembled. First divided into a plurality of sectors along the longitudinal direction, generally one sector every 10 to 30 degrees, the specific degree according to the size and position of the window and the whole size of the vacuum chamberSpecifically, the CFETR Chinese fusion engineering experiment reactor vacuum chamber pre-ground piece is 11.25 degrees and is a sector, and every two 11.25 sectors form 1/16 sectors with the temperature of 22.5 degrees. Three windows, one above the other, are disposed in each 1/16 sector. The sectors are welded and assembled into a whole. Then each sector is cut into a plurality of sectors in the polar direction, each sector is formed independently, the T-shaped rib plates, the transverse rib plates and the vertical rib plates are welded independently, and then each sector is welded in a splicing mode to form a ring. The current CFETR vacuum chamber pre-grinding piece is divided into 4 sectors.

The vacuum chamber bears the processes of vacuumizing, baking, heating, cooling and the like in the service life of the whole nuclear fusion device, the vacuum chamber of the device bears the stress action caused by the huge internal and external temperature difference and certain pressure difference in the process, because the outside of the vacuum chamber is a cold shield which is about 269 ℃ below zero, and the inside of the vacuum chamber is a plasma reaction zone, the temperature is as high as ten million degrees or even hundreds of millions of degrees, and various complex working conditions such as plasma breakage, boundary local area models (ELMs), Vertical Displacement Events (VDE) and the like also occur, the vacuum chamber bears huge instantaneous thermal load and electromagnetic load impact, and the safe operation and experiment of the device are directly influenced. Therefore, the interlayer between the inner and outer shells of the vacuum chamber is filled with soaking type cooling water to cool the vacuum chamber. Various reinforcing rib plates are designed between the two layers of shells, the rib plates not only play a role in reinforcing the strength of the shells, but also play a role in enabling each sector to form an independent cooling water channel in the polar direction.

However, each sector cannot be directly welded into a ring, because if the sector is directly welded, the vertical rib plate and the T-shaped rib plate between the two sectors cannot be welded, and the integral strength of the vacuum chamber is greatly weakened. And the welding seams between the outer shells and the T-shaped rib plates after direct welding become cross welding seams. In ASME, RCC-MR and GB _150 pressure vessel standards and the like, the pressure vessel does not allow the existence of cross welding seams, and all welding seams of a nuclear fusion reactor vacuum chamber need to be subjected to ultrasonic detection, so that the distance between the welding seams is more than 1.5 times of the thickness of a thick weldment.

And the overall assembly profile size of the vacuum chamber of the nuclear fusion reactor is very high, which reaches +/-3 mm, and errors are inevitable in the forming of each sector with the large size, so if two sectors are directly butt-welded, the D-shaped profile error ratio of the vacuum chamber which is not butt-welded or welded is possibly larger.

In order to meet the various requirements and solve the problems, a seam area structure for the joint and the ring formation of the vacuum chamber sectors of the nuclear fusion reactor needs to be designed, the seam area structure comprises a T-shaped rib plate seam block and an outer shell seam block, a certain welding process sequence is included at the same time, the ring formation of the vacuum chamber sectors is realized, and the D-shaped profile error and the strength of the inner shell and the outer shell of the vacuum chamber can meet the design requirements.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a seam region structure for splicing and looping vacuum chamber segments of a nuclear fusion reactor.

The invention is realized by the following technical scheme:

a seam area structure for joining rings between nuclear fusion reactor vacuum chamber fan sections comprises a nuclear fusion reactor vacuum chamber assembly sector and two adjacent fan sections I and II of the nuclear fusion reactor vacuum chamber assembly sector, wherein the middle of the two nuclear fusion reactor vacuum chamber assembly sectors is a fan section seam area, the fan sections I and II are both composed of an inner shell and an outer shell, the end parts of the inner shell of the fan sections I and II are aligned and welded to form an inner shell welding seam, T-shaped rib plates are respectively welded at the middle positions of the outer shells of the fan sections I and II, a T-shaped rib plate welding seam block is welded between the end parts close to the two T-shaped rib plates, two end parts of the T-shaped rib plate welding seam block are respectively reserved for the fan section I T-shaped rib plate and the fan section II T-shaped rib plate to form a boundary line II, rib plates are respectively welded at the positions of the fan section I and the fan section II close to the fan section seam area, the two adjacent ends of the two vertical rib plates are welded together to form a vertical rib plate welding line, the vertical rib plate welding line and the inner shell welding line are located on the same vertical plane, a boundary line III is reserved on the outer shell of the first sector and a boundary line IV is reserved on the outer shell of the second sector, an outer shell joint block is welded between the two ends of the outer shell joint block and the outer shell of the first sector, a boundary line III is reserved on the outer shell of the first sector and a boundary line IV is reserved on the outer shell of the second sector, and the two outer shells are welded to form a sector boundary line.

The distance between the first reserved dividing line and the dividing line of the fan section is b, b is greater than 1.5a, a is the thickness of the vacuum chamber shell, and the distance between the second reserved dividing line and the dividing line of the fan section is b; and the distance between the three reserved dividing lines and the dividing line of the fan section is c, wherein (c-b) is more than 1.5a, and the distance between the four reserved dividing lines and the dividing line of the fan section is c.

The adjacent two sectors of the vacuum chamber assembly sector are spliced into a ring according to the following welding sequence. After the adjacent two sectors are welded with the T-shaped rib plates and the vertical rib plates of the adjacent two sectors, the two sectors are aligned on a tool according to the theoretical design position through a collimation measuring system, and inner shells of the two sectors are welded. And then the welding head stretches into a gap formed by the reserved T-shaped rib plate joint block and the outer shell joint block through a manual or remote control mode to weld the vertical rib plate of the sector, and then the T-shaped rib plate compensation block is welded to be well welded with the inner shell and the T-shaped rib plate body. And finally, covering the joint block of the outer shell and welding the joint block from the outside to ensure that the joint block of the outer shell is well welded with the outer shells of the two sectors, the joint areas of the two sectors, the T-shaped rib plate body and the T-shaped rib plate compensation block.

In the welding process of the T-shaped rib plate seam block and the shell body seam block, the positions of the T-shaped rib plate seam block and the shell body seam block are slightly adjusted through the real-time guiding assembly function of the three-dimensional collimation measurement system, so that the effect of compensating errors formed in the forming process of the shell body of the vacuum chamber is achieved, and the profile tolerance error of the assembly sector of the vacuum chamber of the nuclear fusion reactor is controlled within an error allowable range.

The invention has the advantages that: the joint area structure of the joint ring between the nuclear fusion reactor vacuum chamber segments can make up the error of the vacuum chamber shell body during molding, so that the profile error of the whole sector of the nuclear fusion reactor vacuum chamber after the ring formation is controlled within the error allowable range, the cross welding seam in the joint area is avoided, and the welding of the shell body and the T-shaped rib plate can be finished with high quality.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

As shown in fig. 1, there is a 22.5 degree 1/16 sector on the left, vacuum chamber window sector 18, and a close up view on the right. The vacuum chamber window sector 18 is formed by welding two 11.25-degree vacuum chamber assembly sectors 1 and 19, the two assembly sectors are completely same symmetrical structures, and a sector seam area 4 is arranged in the middle. Each of the vacuum chamber window sectors 18 is arranged with three windows, namely a vacuum chamber window sector upper window 20, a vacuum chamber window sector middle window 21 and a vacuum chamber window sector lower window 22. A seam area structure for joining and looping nuclear fusion reactor vacuum chamber fan sections comprises a nuclear fusion reactor vacuum chamber assembly sector 1, and two adjacent fan sections I2 and II 3 of the nuclear fusion reactor vacuum chamber assembly sector 1, wherein the left side of the nuclear fusion reactor vacuum chamber assembly sector 1 is a sector seam area 4, the fan sections I2 and II 3 are both composed of an inner shell 5 and an outer shell 6, the end parts of the inner shell 5 of the fan sections I2 and II 3 are aligned and welded to form an inner shell welding seam 7, T-shaped rib plates 8 are respectively welded at the middle positions of the outer shells 6 of the fan sections I2 and II 3, a T-shaped welding seam block 9 is welded between the end parts of the two adjacent T-shaped rib plates 8, the two end parts of the T-shaped rib plate welding seam block 9 are respectively reserved for the fan section I T-shaped rib plate with a boundary I10 and the fan section II T-shaped rib plate with a boundary II 11, vertical rib plates 12 are welded at positions, close to a sector joint area 4, of outer shells 6 of a first sector 2 and a second sector 3 respectively, one ends, close to the two vertical rib plates 12, are welded together to form vertical rib plate welding seams 13, the vertical rib plate welding seams 13 and inner shell welding seams 7 are located on the same vertical plane, outer shell joint blocks 16 are welded between a third boundary reserved on the outer shell of the first sector 14 and a fourth boundary reserved on the outer shell of the second sector 15, two end portions of each outer shell joint block 16 coincide with the third boundary reserved on the outer shell of the first sector 14 and the fourth boundary reserved on the outer shell of the second sector 15 respectively, and the two outer shells 6 are welded to form a sector boundary 17.

The distance between the first reserved dividing line 10 and the fan section dividing line 17 is b, b is greater than 1.5a, a is the thickness of the vacuum chamber shell, and the distance between the second reserved dividing line 11 and the fan section dividing line 17 is b; the distance of the third reserved dividing line 14 from the sector dividing line 17 is c, wherein (c-b) is greater than 1.5a, and the distance of the fourth reserved dividing line 15 from the sector dividing line 17 is c.

Claims

1. A kind of joint area structure used for joining the ring between the vacuum chamber segments of the nuclear fusion reactor, characterized by that: the nuclear fusion reactor vacuum chamber assembly sector comprises a nuclear fusion reactor vacuum chamber assembly sector and two adjacent first sectors and second sectors of the nuclear fusion reactor vacuum chamber assembly sector, wherein the middle of the two nuclear fusion reactor vacuum chamber assembly sectors is a sector seam area, the first sectors and the second sectors are both composed of inner shells and outer shells, the end parts of the inner shells of the first sectors and the second sectors are aligned and welded to form inner shell welding seams, T-shaped rib plates are respectively welded at the middle positions of the outer shells of the first sectors and the second sectors, T-shaped rib plate welding seam blocks are welded between the close end parts of the two T-shaped rib plates, two end parts of the T-shaped rib plate welding seam blocks are respectively reserved for the first sectors and the second sectors, vertical rib plates are respectively welded at the positions of the two end parts of the first sectors and the second sectors, the close end parts of the two vertical rib plates are welded together to form vertical rib plate welding seams, the vertical rib plate welding line and the inner shell welding line are located on the same vertical plane, an outer shell joint block is welded between a third boundary reserved on an outer shell of the first sector and a fourth boundary reserved on an outer shell of the second sector, two end portions of the outer shell joint block are respectively overlapped with the third boundary reserved on the outer shell of the first sector and the fourth boundary reserved on the outer shell of the second sector, and the two outer shells are welded to form a sector boundary.

2. The structure of claim 1, wherein the structure is used for the seam region of the ring jointed between the vacuum chamber segments of the nuclear fusion reactor, and is characterized in that: the distance between the first reserved dividing line and the dividing line of the fan section is b, b is greater than 1.5a, a is the thickness of the vacuum chamber shell, and the distance between the second reserved dividing line and the dividing line of the fan section is b; and the distance between the three reserved dividing lines and the dividing line of the fan section is c, wherein (c-b) is more than 1.5a, and the distance between the four reserved dividing lines and the dividing line of the fan section is c.