Multifunctional support segment and reactor pressure vessel

Abstract

The application discloses a multifunctional supporting section, which comprises a vertically arranged cylindrical body, a plurality of circulating pipes and a plurality of separators, the inside of the cylindrical body is vertically through arranged, the upper part of the cylindrical body is communicated with a steam generator, the bottom end of the cylindrical body is communicated with a core, so that the core is communicated with the inlet of the steam generator through the cylindrical body; one end of the circulating pipe is communicated with the inside of the cylindrical body through the outside wall of the cylindrical body, and the other end of the circulating pipe is provided with a main pump; the separator corresponds to the circulating pipe one by one, and the separator is arranged in the corresponding circulating pipe, so that the circulating pipe is divided into a first flow channel and a second flow channel which extend along the length direction of the circulating pipe; one end of the first flow channel is communicated with the outlet of the steam generator, and the other end is communicated with the input end of the main pump; one end of the second flow channel is communicated with the output end of the main pump, and the other end is communicated with the core. The multifunctional supporting section can solve the problems that the existing pressure container structure does not have a coolant flow channel and the integrated structure is not ideal.

Description

Technical Field

[0001] This invention relates to the field of reactor structure design technology, specifically to a multifunctional support section and a reactor pressure vessel. Background Technology

[0002] Modular small reactors (SSMEs) are characterized by miniaturization, modularity, and passive operation. They offer high safety, short construction cycles, and flexible deployment. As a clean distributed energy source, they can provide electricity while also serving various purposes such as seawater desalination, district heating / cooling, and industrial heating. They are suitable for various scenarios, including industrial parks, islands, mining areas, and self-supplied energy for high-energy-consuming enterprises, and have become an important direction for the future development of nuclear power technology.

[0003] The reactor pressure vessel is an important component of the reactor primary coolant pressure boundary. It is used to contain the entire reactor core and the high-temperature, high-pressure coolant, and to prevent the leakage of radioactive materials.

[0004] In a traditional large nuclear power water reactor, the reactor pressure vessel consists of three main parts: the top cover assembly, the vessel assembly, and the fastening and sealing components. The steam generator and the main pump are located outside the reactor pressure vessel. The reactor pressure vessel is connected to the external main steam pipeline through the safety end of the connecting pipe. The reactor pressure vessel, steam generator, main pump, and other equipment are connected through the main steam pipeline to form the reactor primary loop system.

[0005] Based on the functional characteristics of modular small reactors, reactor pressure vessels need to accommodate steam generators, serve as coolant flow channels, support in-reactor equipment, connect and support main pumps, and connect auxiliary systems, among other multifunctional features. The traditional reactor pressure vessel structure for large pressurized water reactors is no longer applicable. Summary of the Invention

[0006] The purpose of this invention is to provide a multifunctional support section to solve the problem that existing pressure vessel structures do not also have coolant flow channels and have unsatisfactory integrated structures.

[0007] This invention is achieved through the following technical solution:

[0008] A multifunctional support section includes: a vertically arranged cylindrical body, the interior of which is vertically connected, the upper part of which is connected to a steam generator, and the bottom end of which is connected to the reactor core, so that the reactor core is connected to the inlet of the steam generator through the cylindrical body; a plurality of circulation pipes, one end of which penetrates the outer wall of the cylindrical body and is connected to the interior of the cylindrical body, and the other end of which is provided with a main pump; and a plurality of partitions, each partition corresponding to a circulation pipe, the partitions being disposed within the corresponding circulation pipe to divide the circulation pipe into a first flow channel and a second flow channel extending along the length of the circulation pipe; one end of the first flow channel is connected to the outlet of the steam generator, and the other end is connected to the input end of the main pump; one end of the second flow channel is connected to the output end of the main pump, and the other end is connected to the reactor core.

[0009] Optionally, the circulation pipe includes a vertical section and a horizontal section that are connected; the end of the horizontal section away from the vertical section is connected to the cylindrical body; the end of the vertical section away from the horizontal section is arranged upward in the vertical direction; and the main pump is located at the top of the vertical section.

[0010] Optionally, the separator includes a horizontal partition and a vertical partition cylinder; the horizontal partition is disposed within the horizontal section and extends along the horizontal section to divide the horizontal section into an upper half and a lower half; the vertical partition cylinder is disposed within the vertical section, and the bottom end of the vertical partition cylinder passes through the horizontal partition, so that the interior of the vertical partition cylinder communicates with the lower half; the interior of the vertical partition cylinder and the lower half communicate to form a second flow channel; the gap between the vertical partition cylinder and the vertical section communicates with the upper half to form a first flow channel.

[0011] Optionally, a surrounding tube is coaxially fitted inside the cylindrical body, and all the first support rings are sealed to the surrounding tube, so that an inner flow channel is formed inside the surrounding tube, and an outer flow channel is formed between the surrounding tube and the cylindrical body; the first flow channel is connected to the outlet of the steam generator through the outer flow channel; the core is connected to the inlet of the steam generator through the inner flow channel.

[0012] Optionally, all the horizontal partitions are located in the same plane, a first support ring is provided inside the cylindrical body, the first support ring and the horizontal partitions are located in the same plane, the outer wall of the first support ring is sealed to the inner wall of the cylindrical body, all the horizontal partitions are connected to the outer wall of the first support ring, and the surrounding cylinder is sealed to the first support ring.

[0013] Optionally, all the circulating pipes are evenly distributed in a ring shape outside the cylindrical body; all the horizontal sections are arranged radially along the cylindrical body; and all the horizontal sections are located on the same plane.

[0014] Optionally, the cylindrical body is provided with a second support ring, the outer wall of the second support ring is sealed to the inner wall of the cylindrical body, and the second support ring is located above the first support ring; the second support ring has a plurality of through holes uniformly formed in a ring shape along the thickness direction; the surrounding cylinder is sandwiched between the second support ring and the first support ring, the top of the surrounding cylinder is sealed to the bottom surface of the second support ring, the inner ring of the second support ring is connected to the interior of the surrounding cylinder, and all the through holes are located outside the surrounding cylinder; the top surface of the second support ring and the inner wall of the cylindrical body form a receiving cavity, the receiving cavity is used to embed a steam generator, the outlet of the steam generator is connected to all the through holes, and the inlet of the steam generator is connected to the inner ring of the second support ring.

[0015] Optionally, the outer wall of the cylindrical body is provided with multiple supports in a ring shape for supporting and fixing to the external environment.

[0016] Optionally, the cylindrical body is connected to a wave-shaped connector, a residual discharge connector, a balancing pipeline connector, and a safety injection connector; the wave-shaped connector and the residual discharge connector are both connected to the portion of the cylindrical body located above the second support ring; the balancing pipeline connector and the safety injection connector are both connected to the portion of the cylindrical body located below the first support ring.

[0017] A reactor pressure vessel comprising any of the aforementioned multifunctional support sections.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] This invention provides a multifunctional support section that, through a cylindrical body, provides a basic support structure and a sealed connection structure for the steam generator and reactor core. Based on this, several circulation pipes are installed, allowing direct connection to the main pump. This eliminates the need for an external main steam pipeline while simultaneously enabling the multifunctional support section to also function as a coolant flow channel, improving the integration of the structure. Specifically, by using a separator, the circulation pipes are divided into a first flow channel and a second flow channel. The two ends of the first flow channel are connected to the outlet of the steam generator and the input of the main pump, respectively, while the two ends of the second flow channel are connected to the output of the main pump and the reactor core, respectively. Coolant cooled by the steam generator flows into the main pump through the first flow channel, is pumped out by the main pump to the second flow channel, and then flows into the reactor core for cooling. The coolant accumulated in the reactor core eventually floats up through the cylindrical body and flows into the inlet of the steam generator, thus achieving coolant circulation. Through the synergy of these features, this multifunctional support section effectively solves the problem of existing pressure vessel structures lacking coolant flow channels and having an unsatisfactory integrated structure. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a cross-sectional view of the multifunctional support section provided in an embodiment of the present invention;

[0022] Figure 2 This is a top view schematic diagram of a multifunctional support section provided in an embodiment of the present invention.

[0023] The attached diagram shows the markings and corresponding component names:

[0024] 10-Cylindrical body; 11-First support ring; 12-Second support ring; 121-Through hole; 13-Receiving cavity; 14-Support; 20-Circulation pipe; 201-First flow channel; 202-Second flow channel; 203-Vertical section; 204-Horizontal section; 30-Separator; 31-Horizontal partition; 32-Vertical partition cylinder; 40-Enclosing cylinder; 41-Inner flow channel; 42-Outer flow channel; 50-Wave pipe; 51-Excess drain pipe; 52-Balance pipeline pipe; 53-Safety injection pipe. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0026] Please refer to Figure 1 and Figure 2 This invention provides a multifunctional support section, including a vertically arranged cylindrical body 10, the interior of which is vertically connected. The top end of the cylindrical body 10 is connected to a steam generator (not shown), and the bottom end is connected to the reactor core (not shown), so that the reactor core is connected to the inlet of the steam generator through the cylindrical body 10. The second part includes a plurality of circulation pipes 20, one end of which penetrates the outer wall of the cylindrical body 10 and communicates with the interior of the cylindrical body 10. The other end of the 0 is equipped with a main pump (not shown in the figure); the third includes a plurality of partitions 30, each partition 30 corresponding to a circulation pipe 20, and the partitions 30 are disposed within the corresponding circulation pipe 20 to divide the circulation pipe 20 into a first flow channel 201 and a second flow channel 202 extending along the length direction of the circulation pipe 20; one end of the first flow channel 201 is connected to the outlet of the steam generator and the other end is connected to the input end of the main pump; one end of the second flow channel 202 is connected to the output end of the main pump and the other end is connected to the reactor core.

[0027] The multi-functional support section provided in this embodiment, through the cylindrical body 10, provides a basic support structure and a sealed communication structure for the steam generator and the reactor core. Based on this, by setting several circulation pipes 20, it is directly connected to the main pump, eliminating the need for an external main steam pipeline while also making the multi-functional support section a coolant flow channel, thus improving the integration of the structure. Specifically, by setting a separator 30, the circulation pipe 20 is divided into a first flow channel 201 and a second flow channel 202, with the two ends of the first flow channel 201 connected to the outlet of the steam generator and the input of the main pump, respectively. The two ends of the second flow channel 202 are connected to the output end of the main pump and the reactor core, respectively. The coolant cooled by the steam generator flows into the main pump through the first flow channel 201, is pumped out by the main pump to the second flow channel 202, and flows into the reactor core for cooling. The coolant accumulated in the reactor core finally floats up through the cylindrical body 10 and flows into the inlet of the steam generator, thereby realizing the circulation of coolant. Through the cooperation of the above features, this multi-functional support section can effectively solve the problem that the existing pressure vessel structure does not have a coolant flow channel and the integrated structure is not ideal.

[0028] To provide structural support for the main pump and improve the integration of the entire device, the circulation pipe 20 includes a vertical section 203 and a horizontal section 204 that are connected; one end of the horizontal section 204 away from the vertical section 203 is connected to the cylindrical body 10; one end of the vertical section 203 away from the horizontal section 204 is arranged vertically upward; the main pump is located at the top of the vertical section 203.

[0029] With the above configuration, the vertically arranged vertical section 203 supports the main pump, effectively improving the support effect. Furthermore, the vertically arranged vertical section 203 can be positioned as close as possible to the side wall of the cylindrical body 10, effectively improving the integration of the entire device.

[0030] To further explain the specific structure of the separator 30, the separator 30 includes a horizontal partition 31 and a vertical partition cylinder 32; the horizontal partition 31 is disposed within the horizontal section 204 and extends along the horizontal section 204 to divide the horizontal section 204 into an upper half and a lower half; the vertical partition cylinder 32 is disposed within the vertical section 203, and the bottom end of the vertical partition cylinder 32 penetrates through the horizontal partition 31 to communicate with the lower half; the communication between the interior of the vertical partition cylinder 32 and the lower half forms the second flow channel 202; the gap between the vertical partition cylinder 32 and the vertical section 203 and the upper half forms the first flow channel 201.

[0031] It should be noted that the inner end of the first flow channel 201 and the inner end of the second flow channel 202 can be connected to the corresponding structure in any way in the prior art. For example, the inner end of the first flow channel 201 can be connected to the outlet of the steam generator through a built-in pipe.

[0032] To prevent unnecessary communication between the ends of the first flow channel 201 and the second flow channel 202 located inside the cylindrical body 10, a surrounding cylinder 40 is coaxially fitted inside the cylindrical body 10. All the first support rings 11 are sealed to the surrounding cylinder 40, so that an inner flow channel 41 is formed inside the surrounding cylinder 40, and an outer flow channel 42 is formed between the surrounding cylinder 40 and the cylindrical body 10. The first flow channel 201 is connected to the outlet of the steam generator through the outer flow channel 42. The core is connected to the inlet of the steam generator through the inner flow channel 41.

[0033] With the above configuration, the enclosure 40 forms an effective isolation, so that the coolant discharged from the steam generator outlet can only flow into the first flow channel 201 through the outer flow channel 42, and the coolant accumulated and floating in the core can only flow into the steam generator inlet through the inner flow channel 41.

[0034] To provide effective structural support for the cylindrical tube 40, all the horizontal partitions 31 are located on the same plane. A first support ring 11 is provided inside the cylindrical body 10. The first support ring 11 and the horizontal partitions 31 are located on the same plane. The outer wall of the first support ring 11 is sealed to the inner wall of the cylindrical body 10. All the horizontal partitions 31 are connected to the outer wall of the first support ring 11. The cylindrical tube 40 is sealed to the first support ring 11.

[0035] With the above arrangement, on the one hand, the first support ring 11 provides structural support for the inner ends of all horizontal partitions 31, making the overall structure stable; on the other hand, the first support ring 11 can effectively support the surrounding cylinder 40, making it stably set on the top side of the first support ring 11; and on the third hand, the first support ring 11 further seals the bottom of the surrounding cylinder 40, so that the first flow channel 201 must be connected to the outer flow channel 42.

[0036] To ensure a balanced inflow and outflow of all circulation nozzles 20, and to allow coolant to flow evenly into the reactor core from each circulation nozzle 20, all circulation nozzles 20 are evenly distributed in a ring shape outside the cylindrical body 10; all horizontal sections 204 are arranged radially along the cylindrical body 10; and all horizontal sections 204 are located on the same plane.

[0037] To further enhance the integration of the entire device, a second support ring 12 is provided inside the cylindrical body 10. The outer wall of the second support ring 12 is sealed to the inner wall of the cylindrical body 10, and the second support ring 12 is located above the first support ring 11. The second support ring 12 has a plurality of through holes 121 evenly distributed in a ring shape along the thickness direction. The surrounding cylinder 40 is sandwiched between the second support ring 12 and the first support ring 11. The top of the surrounding cylinder 40 is connected to the inner stepped surface of the second support ring 12, and the inner ring of the second support ring 12 communicates with the interior of the surrounding cylinder 40. All the through holes 121 are located outside the surrounding cylinder 40. The top surface of the second support ring 12 and the inner wall of the cylindrical body 10 form a receiving cavity 13. The receiving cavity 13 is used to embed a steam generator. The outlet of the steam generator communicates with all the through holes 121, and the inlet of the steam generator communicates with the inner ring of the second support ring 12.

[0038] With the above configuration, the second support ring 12 forms a receiving cavity 13, and the steam generator is further embedded in the receiving cavity, thereby further improving the integration of the entire device. In addition, the second support ring 12 can cooperate with the first support ring 11 to position and fix the casing 40 in two positions, effectively improving the structural performance of the casing 40 and the sealing and stability of the first flow channel 201 and the second flow channel 202. Furthermore, by uniformly arranging the through holes 121 in a ring shape on the second support ring 12, the coolant discharged from the steam generator can flow into the outer flow channel 42 evenly through different through holes 121, and then evenly distribute it into multiple first flow channels 201, thereby further improving the uniformity of coolant circulation.

[0039] Preferably, the outer wall of the cylindrical body 10 is provided with a plurality of supports 14 in a ring shape for supporting and fixing to the external environment.

[0040] Preferably, the cylindrical body 10 is connected to a wave-pulling connector 50, a residual drain connector 51, a balancing pipeline connector 52, and an injection connector 53; the wave-pulling connector 50 and the residual drain connector 51 are both connected to the portion of the cylindrical body 10 located above the second support ring 12; the balancing pipeline connector 52 and the injection connector 53 are both connected to the portion of the cylindrical body 10 located below the first support ring 11.

[0041] This embodiment also provides a reactor pressure vessel, including any of the above-mentioned multifunctional support sections.

[0042] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multifunctional support section, characterized in that, include: A vertically arranged cylindrical body (10) is provided, with the interior of the cylindrical body (10) extending vertically. The upper part of the cylindrical body (10) is connected to the steam generator, and the bottom end of the cylindrical body (10) is connected to the reactor core, so that the reactor core is connected to the inlet of the steam generator through the cylindrical body (10). A plurality of circulation pipes (20) are provided, one end of which penetrates the outer wall of the cylindrical body (10) and communicates with the interior of the cylindrical body (10), and the other end of the circulation pipes (20) is provided with a main pump; A plurality of partitions (30) are provided, each of which corresponds to a circulation pipe (20). The partitions (30) are disposed within the corresponding circulation pipe (20) to divide the circulation pipe (20) into a first flow channel (201) and a second flow channel (202) extending along the length direction of the circulation pipe (20). One end of the first flow channel (201) is connected to the outlet of the steam generator, and the other end is connected to the input of the main pump; One end of the second flow channel (202) is connected to the output end of the main pump, and the other end is connected to the reactor core; The circulating pipe (20) includes a connected vertical section (203) and a horizontal section (204). The end of the horizontal segment (204) away from the vertical segment (203) is connected to the cylindrical body (10); The vertical segment (203) is positioned vertically upward at the end furthest from the horizontal segment (204); The main pump is located at the top of the vertical section (203); The separator (30) includes a horizontal partition (31) and a vertical partition (32); The horizontal partition (31) is disposed within the horizontal segment (204) and extends along the horizontal segment (204) to divide the horizontal segment (204) into an upper half and a lower half; The vertical partition (32) is located inside the vertical section (203), and the bottom end of the vertical partition (32) passes through the horizontal partition (31) so that the interior of the vertical partition (32) is connected to the lower half. The interior of the vertical partition (32) and the lower half are connected to form the second flow channel (202); The gap between the vertical partition (32) and the vertical section (203) and the upper half form the first flow channel (201). All the horizontal partitions (31) are located on the same plane. The cylindrical body (10) is provided with a first support ring (11). The first support ring (11) and the horizontal partitions (31) are located on the same plane. The outer wall of the first support ring (11) is sealed to the inner wall of the cylindrical body (10). All the horizontal partitions (31) are connected to the outer wall of the first support ring (11). The cylindrical body (10) is coaxially fitted with a surrounding tube (40), and all the first support rings (11) are sealed to the surrounding tube (40) so that an inner flow channel (41) is formed inside the surrounding tube (40) and an outer flow channel (42) is formed between the surrounding tube (40) and the cylindrical body (10). The surrounding tube (40) is sealed to the first support ring (11); The first flow channel (201) is connected to the outlet of the steam generator through the outer flow channel (42); The reactor core is connected to the inlet of the steam generator through the internal flow channel (41).

2. The multifunctional support section according to claim 1, characterized in that, All of the aforementioned circulating pipes (20) are evenly distributed in a ring shape outside the cylindrical body (10); All of the horizontal segments (204) are arranged radially along the cylindrical body (10); All of the horizontal segments (204) are located on the same plane.

3. The multifunctional support section according to claim 1, characterized in that, The cylindrical body (10) is provided with a second support ring (12), the outer wall of the second support ring (12) is sealed to the inner wall of the cylindrical body (10), and the second support ring (12) is located above the first support ring (11); The second support ring (12) has a plurality of through holes (121) uniformly opened in a ring shape along the thickness direction. The casing (40) is sandwiched between the second support ring (12) and the first support ring (11). The top of the casing (40) is connected to the inner step surface of the second support ring (12). The inner ring of the second support ring (12) is connected to the interior of the casing (40). All the through holes (121) are located outside the casing (40). The top surface of the second support ring (12) and the inner wall of the cylindrical body (10) form a receiving cavity (13). The receiving cavity (13) is used to embed a steam generator. The outlet of the steam generator is connected to all the through holes (121), and the inlet of the steam generator is connected to the inner ring of the second support ring (12).

4. The multifunctional support section according to claim 1, characterized in that, The outer wall of the cylindrical body (10) is provided with multiple supports (14) in a ring shape for supporting and fixing with the external environment.

5. The multifunctional support section according to claim 3, characterized in that, The cylindrical body (10) is connected to a wave-shaped connector (50), a residual outlet connector (51), a balance pipeline connector (52), and a safety injection connector (53). The fluctuating connector (50) and the excess outlet connector (51) are both connected to the portion of the cylindrical body (10) located above the second support ring (12); Both the balance pipeline connector (52) and the safety injection connector (53) are connected to the portion of the cylindrical body (10) located below the first support ring (11).

6. A reactor pressure vessel, characterized in that, Includes the multifunctional support section as described in any one of claims 1-5.

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