Cooling system for safety container

Abstract

The invention discloses a cooling system for a safety container, which comprises the safety container, a shielding wall surrounding the safety container, an external ventilation cooling structure between the safety container and the shielding wall, and an air circulation device in the safety container, heat in the safety container is rapidly taken away through the air circulation device in the safety container and the external ventilation cooling structure, so that cooling is carried out; the external ventilation cooling structure comprises an annular cooling cavity for cooling the vertical barrel of the safety container and a dome cooling cavity for cooling the arc dome, a middle partition plate is arranged between the annular cooling cavity and the dome cooling cavity, a communicating hole is formed in the middle partition plate, the bottom of the annular cooling cavity is communicated with the air inlet, and the bottom of the dome cooling cavity is communicated with the air outlet. The top of the annular cooling cavity is communicated with the dome cooling cavity through a communicating hole, the top of the dome cooling cavity is communicated with an air outlet formed in the upper portion of the shielding wall, and cooling air flow cools the vertical barrel through the annular cooling cavity, then cools the arc dome and finally flows out of the shielding wall.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear reactors, and in particular to a cooling system for a safety container. Background Art

[0002] The reactor compartment of a high-temperature nuclear reactor is usually surrounded by concrete structures, such as Figure 1 As shown in the figure, the stack compartment can be divided into a lower stack compartment and an upper stack compartment. The lower stack compartment includes a safety container and a stack body placed inside the safety container. The upper stack compartment is also equipped with a safety container and related equipment. The upper and lower stack compartments are separated by a shielding structure. The safety container is generally designed as a sealed metal container, in which the safety container in the upper stack compartment is mainly composed of a vertical cylinder, an arc dome, a hoisting channel and a flat top cover.

[0003] For high-temperature reactors, the lower compartment contains the reactor body, which has a high temperature, usually greater than 600°C, and is a high-temperature compartment. The internal equipment of the upper compartment generally includes the control rod drive system, the neutron source drive system, and measurement and other monitoring instruments. In addition, for the integrated reactor design, the upper compartment may also contain primary circuit main pump related equipment, such as drive motors, transmission shafts, etc. Therefore, the temperature of the upper compartment is relatively low, usually below 100°C, and is a low-temperature compartment. Considering radioactive safety, in order to increase the reactor radioactive safety barrier, safety containers are designed in the upper and lower compartments to envelop the radioactive release of the core area. Most of the equipment in the upper compartment is placed in the safety container. The equipment in the upper compartment has strict temperature requirements for the operating environment, so it needs to be met by specially designed insulation and cooling; on the one hand, it is necessary to suppress the heat transfer from the lower compartment to the upper compartment through insulation, and on the other hand, it is necessary to transfer the heat of the upper compartment through active cooling to achieve the purpose of controlling the working environment temperature of the equipment in the upper safety container.

[0004] Since the safety container itself has the special function of isolating radioactivity and preventing radioactive spillage, the radioactive activity of the internal environmental gas is relatively high and generally cannot be directly discharged outside the safety container. Therefore, it is impossible to directly cool the equipment inside the safety container in the upper stack compartment. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the internal environment of the safety container in the upper stack compartment cannot be cooled, and to provide a cooling system for the safety container.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a cooling system for a safety container, the cooling system comprising a safety container and a shielding wall surrounding the safety container, the cooling system further comprising an external ventilation cooling structure arranged between the safety container and the shielding wall and an air circulation device in the safety container, the external ventilation cooling structure comprising an annular cooling cavity for cooling the vertical cylinder of the safety container and a dome cooling cavity for cooling the arc-shaped dome, an intermediate partition is arranged between the annular cooling cavity and the dome cooling cavity, a connecting hole is arranged on the intermediate partition, the bottom of the annular cooling cavity is connected to an air inlet, the top of the annular cooling cavity is connected to the dome cooling cavity through the connecting hole, and the top of the dome cooling cavity is connected to an air outlet arranged on the upper part of the shielding wall.

[0008] In this scheme, an external ventilation and cooling structure is arranged between the safety container and the shielding wall, and an air circulation device is arranged in the safety container. The air circulation device in the safety container will enhance the air disturbance in the safety container, promote the uniform temperature of the ambient gas inside the safety container, and quickly transfer the internal heat to the wall of the safety container. The external ventilation and cooling structure cools the heat on the wall of the safety container, and the heat in the safety container can be quickly taken away by the air circulation device in the safety container and the external ventilation and cooling structure to cool the safety container; the external ventilation and cooling structure includes an annular cooling cavity and a dome cooling cavity, and an intermediate partition is arranged between the annular cooling cavity and the dome cooling cavity, that is, the safety container is cooled in sections according to the structure of the safety container, and a connecting hole is arranged on the intermediate partition, and the dome cooling cavity is connected with the annular cooling cavity through the connecting hole, so that the cooling airflow cools the vertical cylinder through the annular cooling cavity and then enters the dome cooling cavity to cool the arc dome; the top of the dome cooling cavity is connected with the air outlet arranged on the upper part of the shielding wall so that the cooled airflow flows out of the shielding wall through the air outlet.

[0009] Preferably, a cylindrical shell coaxial with the vertical cylinder of the safety container is provided between the vertical cylinder of the safety container and the shielding wall, and the annular cooling cavity is formed between the cylindrical shell and the vertical cylinder.

[0010] In this solution, a cylindrical shell coaxial with the vertical cylinder is arranged between the vertical cylinder and the shielding wall, and an annular cooling cavity is formed between the cylindrical shell and the vertical cylinder, thereby forming a circulation channel for cooling air flow outside the safety container, and the cooling air flow exchanges heat with the safety container to cool the safety container.

[0011] Preferably, a plurality of vertically arranged baffles are provided in the annular cooling cavity, the plurality of baffles are arranged at intervals along the circumference of the annular cooling cavity, and the dimension of the plurality of baffles along the axial direction of the vertical cylinder is smaller than the height of the annular cooling cavity.

[0012] In the present embodiment, a plurality of baffles are arranged in the annular cooling cavity, and the plurality of baffles are arranged at intervals along the circumference of the annular cooling cavity. The cooling airflow is guided by the plurality of baffles so that the cooling airflow can flow to the circumference of the vertical cylinder to surround the vertical cylinder, thereby allowing the cooling airflow to cover the outer circumference of the vertical cylinder; the axial dimensions of the plurality of baffles along the vertical cylinder are smaller than the height of the annular cooling cavity, so that the baffles have a gap with the vertical cylinder in the axial direction, and the airflow can flow through the gap to the area corresponding to the next baffle.

[0013] Preferably, the inner side of the baffle is arranged on the vertical cylinder of the safety container, and the outer side of the baffle is arranged on the cylindrical shell, and a plurality of the baffles alternately form notches at the top and bottom ends of the annular cooling cavity.

[0014] In this scheme, the baffles are radially connected to the vertical cylinder and the cylindrical shell, respectively, and notches are formed at the top and bottom ends of the annular cooling chamber, so that the airflow flows along a certain route around the outer periphery of the vertical cylinder, flowing in an S-shape from the bottom to the top of the vertical cylinder or from the top to the bottom, and can cover the vertical cylinder from top to bottom or from bottom to top.

[0015] Preferably, an annular top plate parallel to the middle partition is arranged above the middle partition, a vertical circumferential tube is connected between the middle partition and the annular top plate, the vertical circumferential tube is located on the inner side of the shielding wall, the vertical circumferential tube, the middle partition, the annular top plate and the arc-shaped dome form the dome cooling chamber, one end of the annular top plate is connected to the vertical circumferential tube, and the other end of the annular top plate has a first gap with the lifting channel.

[0016] In the present scheme, an annular top plate and a vertical shroud are provided, so that the annular top plate, the vertical shroud, the middle partition plate and the arc-shaped dome form a dome cooling cavity. One end of the annular top plate is provided on the vertical shroud, and the other end of the annular top plate extends toward the hoisting channel of the safety container and has a first gap with the hoisting channel, which not only realizes the installation of the annular top plate, but also allows the cooling airflow in the dome cooling cavity to flow out through the first gap, thereby forming an air outlet of the dome cooling cavity.

[0017] Preferably, a plurality of guide plates are spaced apart in the dome cooling cavity, and the extension direction of the guide plates is arranged at an angle to the radial direction; the lower end of the extension edge of the guide plate is located above the arc-shaped dome and has a second gap with the arc-shaped dome.

[0018] In the present embodiment, a plurality of guide plates are spaced apart in the dome cooling cavity, and these guide plates can guide the cooling airflow on the end surface of the arc-shaped dome. The extension direction of the guide plates is arranged at an angle to the radial direction so that the plurality of guide plates are distributed in a spiral shape, thereby enhancing airflow disturbance and heat exchange. The extension edge of the guide plate is located above the arc-shaped dome and has a second gap with the arc-shaped dome. The second gap is located above the arc-shaped dome, that is, a second gap is formed above the arc, through which the cooling airflow can flow, so that the airflow rotates over the entire arc-shaped dome.

[0019] Preferably, the guide plate is fixed on the middle partition, the outer side wall of the guide plate is connected to the side enclosure tube of the dome cooling chamber, and the end of the extended edge has a third gap with the hoisting channel.

[0020] In this embodiment, the end of the extended edge of the guide plate also has a third gap with the hanging channel so that the cooling airflow gradually rises while rotating over the arc dome and flows out of the dome cooling cavity through the third gap between the hanging channel.

[0021] Preferably, the bottom of the cylindrical shell is provided with two air inlets at intervals, and the two air inlets are located on the same diameter; the upper part of the cylindrical shell is provided with two air outlets, and the two air outlets are located on the same diameter, and the projection of the diameter of the two air outlets is perpendicular to the projection of the diameter of the two air inlets; the outer sides of the partition corresponding to the two air outlets are respectively provided with connecting holes;

[0022] Alternatively, an air inlet is provided at the bottom of the cylindrical shell, an air outlet is provided at the upper portion of the cylindrical shell, and the projection of the air outlet is located on the same diameter as the projection of the air inlet; a connecting hole is provided on the partition corresponding to the outer side of the air outlet.

[0023] In this solution, two air inlets are arranged at intervals at the bottom of the cylindrical shell, and two air outlets are arranged at the upper part of the cylindrical shell. The cooling airflow enters the annular cooling cavity through the two air inlets, flows out of the annular cooling cavity through the two air outlets after cooling the entire outer wall of the vertical cylinder, and enters the dome cooling cavity through the connecting hole, that is, a two-inlet and two-outlet structure is formed in the annular cooling cavity; the projection of the diameter of the two air outlets is perpendicular to the projection of the diameter of the two air inlets, so that the cooling airflow passes over the outer wall of the entire vertical cylinder;

[0024] An air inlet is provided at the bottom of the cylindrical shell, and an air outlet is provided at the upper part of the cylindrical shell. The projection of the air outlet and the projection of the air inlet are located on the same diameter. The cooling airflow enters the annular cooling cavity through the air inlet, cools the entire outer wall of the vertical cylinder, and then flows out of the annular cooling cavity through the air outlet, and enters the dome cooling cavity through the connecting hole. The projection of the air outlet and the projection of the air inlet are located on the same diameter, so that the cooling airflow passes over the outer wall of the entire vertical cylinder and then flows into the dome cooling cavity through the connecting hole.

[0025] Preferably, a double 90-degree bend is provided on the connecting hole, and the double 90-degree bend includes a first bend portion connected to the air outlet, a straight pipe portion connected to the connecting hole, and a second bend portion extending into the dome cooling cavity, and the outlet of the second bend portion has a deflection angle relative to the inlet of the first bend portion.

[0026] In the present solution, a double 90-degree elbow is arranged in the connecting hole so that the cooling airflow of the annular cooling cavity can be smoothly introduced into the dome cooling cavity. The outlet of the second elbow portion has a deflection angle relative to the inlet of the first elbow portion, so that the direction of the cooling airflow at the outlet of the second elbow has components along the circumferential and radial directions of the arc dome. Under the guidance of the guide plate in the dome cooling cavity, the cooling airflow can flow along the circumferential direction of the arc dome and pass over the arc dome in the radial direction, so that the cooling airflow passes over the entire arc dome to achieve the purpose of cooling the arc dome.

[0027] Preferably, the air circulation device in the safety container is a circulation fan, which is arranged at the inner edge of the safety container, and the air outlet end of the circulation fan faces the center of the safety container.

[0028] In this scheme, a circulating fan is arranged at the inner edge of the safety container, and the air outlet of the circulating fan is directed toward the center of the safety container. On the one hand, it can directly enhance the heat dissipation of the heating equipment in the safety container and reduce the temperature of the heating equipment itself. On the other hand, it can accelerate the flow of gas inside the safety container, enhance the transfer of heat inside the safety container to the safety container, promote the uniformity of the gas temperature inside the safety container, and reduce the ambient temperature inside the safety container.

[0029] The positive and progressive effects of the present invention are: by arranging an external ventilation and cooling structure between the safety container and the shielding wall, and arranging an air circulation device in the safety container, the air circulation device in the safety container will enhance the air disturbance in the safety container, promote the uniform temperature of the internal ambient gas of the safety container, and quickly transfer the internal heat to the wall of the safety container, and the external ventilation and cooling structure will cool the heat on the wall of the safety container, and the heat in the safety container can be quickly taken away by the air circulation device in the safety container and the external ventilation and cooling structure to cool it, and there is no gas exchange between the inside and the outside of the safety container, thereby reducing the risk of radioactive spillover; the external ventilation and cooling structure includes an annular cooling cavity and a dome cooling cavity, and the safety container is cooled in sections according to the structure of the safety container, and the dome cooling cavity is connected to the annular cooling cavity by arranging a connecting hole on the middle partition, so that the cooling airflow cools the vertical cylinder through the annular cooling cavity and then enters the dome cooling cavity to cool the arc dome; the top of the dome cooling cavity is connected to the air outlet arranged on the upper part of the shielding wall so that the cooled airflow flows out of the shielding wall through the air outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is an overall structural diagram of a high-temperature nuclear reactor in the prior art.

[0031] Figure 2 This is a schematic diagram of the structure of the safety container cooling system in the upper stack compartment.

[0032] Figure 3 This is the structural diagram of external ventilation cooling.

[0033] Figure 4 The distribution diagram of air inlet and outlet.

[0034] Figure 5 This is another distribution diagram of air inlets and outlets.

[0035] Figure 6 Schematic diagram of the structure of the dome cooling chamber.

[0036] Figure 7 A top view of the dome cooling chamber.

[0037] Description of Reference Numerals

[0038] Upper stack 1

[0039] Lower stack 2

[0040] Lifting channel 3

[0041] Vertical cylinder 4

[0042] Curved dome 5

[0043] Flat top cover 6

[0044] Cooling system7

[0045] Shielding Wall 8

[0046] Safety Container 9

[0047] External ventilation cooling structure 10

[0048] Air circulation device 11

[0049] Annular cooling chamber 12

[0050] Dome cooling chamber 13

[0051] Middle partition 14

[0052] Communication hole 15

[0053] Air Inlet 16

[0054] Air outlet 17

[0055] Baffle 18

[0056] Annular top plate 19

[0057] First gap 20

[0058] Deflector 21

[0059] Second gap 22

[0060] Third gap 23

[0061] Double 90 degree elbow 24

[0062] First curved pipe portion 25

[0063] Second curved pipe portion 26

[0064] Exhaust pipe 27

[0065] Vertical enclosure 28

[0066] Vent 29

[0067] Cylindrical housing 30 DETAILED DESCRIPTION

[0068] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0069] The overall structure of a high temperature nuclear reactor in the prior art is as follows: Figure 1As shown, the stack compartment can be divided into a lower stack compartment 2 and an upper stack compartment 1. The lower stack compartment 2 includes a safety container 9 and a stack body placed inside the safety container 9. The upper stack compartment 1 is also provided with a safety container 9 and related equipment. The upper stack compartment 1 and the lower stack compartment 2 are separated by a shielding structure. The safety container 9 is generally designed to be a sealed metal container, wherein the safety container 9 in the upper stack compartment 1 is mainly composed of a vertical cylinder 4, an arc-shaped dome 5, a lifting channel 3 and a flat top cover 6. Most of the equipment in the upper stack compartment 1 is placed in the safety container 9. The equipment in the upper stack compartment 1 has relatively strict temperature requirements for the operating environment, and therefore needs to be cooled. In this regard, the present invention provides a cooling system 7 for a safety container, such as Figure 2-Figure 3 As shown, the cooling system 7 includes a safety container 9 and a shielding wall 8 surrounding the safety container 9. The cooling system 7 also includes an external ventilation cooling structure 10 arranged between the safety container 9 and the shielding wall 8 and an air circulation device 11 in the safety container 9. The external ventilation cooling structure 10 includes an annular cooling cavity 12 for cooling the vertical cylinder 4 of the safety container 9 and a dome cooling cavity 13 for cooling the arc-shaped dome 5. An intermediate partition 14 is arranged between the annular cooling cavity 12 and the dome cooling cavity 13. A connecting hole 15 is arranged on the intermediate partition 14. The bottom of the annular cooling cavity 12 is connected to the air inlet 16, and the top of the annular cooling cavity 12 is connected to the dome cooling cavity 13 through the connecting hole 15. The top of the dome cooling cavity 13 is connected to the air outlet 17 arranged on the upper part of the shielding wall 8.

[0070] An external ventilation cooling structure 10 is arranged between the safety container 9 and the shielding wall 8, and an air circulation device 11 is arranged in the safety container 9. The air circulation device 11 in the safety container 9 will enhance the air disturbance in the safety container 9, promote the uniform temperature of the internal ambient gas of the safety container 9, and quickly transfer the internal heat to the wall of the safety container 9. The external ventilation cooling structure 10 cools the heat on the wall of the safety container 9. The heat in the safety container 9 can be quickly taken away by the air circulation device 11 in the safety container 9 and the external ventilation cooling structure 10, so as to cool the safety container 9. The external ventilation cooling structure 10 includes an annular cooling cavity 12 and a dome cooling cavity 13, and an intermediate partition 14 is arranged between the annular cooling cavity 12 and the dome cooling cavity 13, that is, the safety container 9 is cooled in sections according to the structure of the safety container 9, and a connecting hole 15 is arranged on the intermediate partition 14. Figure 2The middle arrow indicates the flow direction of the cooling airflow. The dome cooling chamber 13 is connected to the annular cooling chamber 12 through the connecting hole 15, so that the cooling airflow cools the vertical cylinder 4 through the annular cooling chamber 12 and then enters the dome cooling chamber 13 to cool the arc dome 5; the top of the dome cooling chamber 13 is connected to the air outlet 17 provided on the upper part of the shielding wall 8, so that the cooled airflow flows out of the shielding wall 8 through the air outlet 17. The dome cooling chamber 13 and the upper part of the shielding wall 8 are provided with a receiving chamber, and the air outlet 17 is provided on the corresponding side walls of the shielding wall 8 and the receiving chamber, and the air outlet 17 is penetrated by an exhaust pipe 27, and the exhaust pipe 27 extends into the receiving chamber to discharge the cooling airflow out of the shielding wall 8.

[0071] like Figure 2-Figure 3 As shown, a cylindrical shell 30 coaxial with the vertical cylinder 4 is arranged between the vertical cylinder 4 and the shielding wall 8, and an annular cooling chamber 12 is formed between the cylindrical shell 30 and the vertical cylinder 4, thereby forming a circulation channel for cooling airflow outside the safety container 9, and the cooling airflow exchanges heat with the safety container 9 to cool the safety container 9.

[0072] like Figure 3 As shown, a plurality of baffles 18 are arranged outside the annular cooling cavity 12, and the plurality of baffles 18 are arranged at intervals along the circumference of the annular cooling cavity 12, and the dimension of the plurality of baffles 18 along the axial direction of the vertical cylinder 4 is smaller than the height of the annular cooling cavity 12. The cooling airflow is guided by the plurality of baffles 18 so that the cooling airflow can flow to the circumference of the vertical cylinder 4 to surround the vertical cylinder 4, so that the cooling airflow covers the outer periphery of the vertical cylinder 4; the dimension of the plurality of baffles 18 along the axial direction of the vertical cylinder 4 is smaller than the height of the vertical cylinder 4, so that in the axial direction, there is a gap between the end of the baffle 18 and the wall surface of the vertical cylinder 4, and the airflow can flow to the area corresponding to the next baffle 18 through the gap; for example, the dimension of the baffle 18 along the axial direction of the vertical cylinder 4 differs from the height of the vertical cylinder 4 by 0.5m-0.7m, and of course, the specific height difference can also be adjusted according to the actual cooling requirements.

[0073] Specifically, the inner side of the baffle 18 is arranged on the vertical cylinder 4, and the outer side of the baffle 18 is arranged on the cylindrical shell 30, that is, the baffle 18 is connected to the vertical cylinder 4 and the cylindrical shell 30 in the radial direction, respectively. A plurality of baffles 18 alternately form notches at the top and bottom of the annular cooling cavity 12, so that the airflow flows along a certain route around the outer periphery of the vertical cylinder 4, and flows in an S-shaped manner from the bottom to the top or from the top to the bottom of the vertical cylinder 4, and can cover the vertical cylinder 4 from top to bottom or from bottom to top. The number of baffles 18 and the spacing in the circumferential direction can be appropriately adjusted according to specific cooling requirements. Although in this embodiment, a plurality of baffles 18 alternately form notches at the top and bottom of the annular cooling cavity 12, of course, in other embodiments, the position of the notches can also be adjusted as needed, as long as the cooling airflow can flow through the entire straight section, such as setting the baffles to form notches at the top, bottom and middle of the annular cooling cavity.

[0074] like Figure 3 , Figure 6 As shown, an annular top plate 19 parallel to the middle partition 14 is arranged above the middle partition 14, a vertical shroud 28 is connected between the middle partition 14 and the annular top plate 19, the vertical shroud 28 is located on the inner side of the shielding wall, one end of the annular top plate 19 is arranged on the vertical shroud 28, the other end of the annular top plate 19 extends to the hoisting channel 3 of the safety container 9, and has a first gap 20 with the hoisting channel 3, the width of the first gap 20 is set as needed, such as 0.1m-0.2m; the annular top plate 19, the middle partition 14 and the vertical shroud 28 and the arc-shaped dome form a dome cooling cavity 13, and the first gap 20 forms an air outlet of the dome cooling cavity 13. An annular top plate 19, a vertical circumferential cylinder 28, a middle partition plate 14 and an arc-shaped dome 5 are arranged to form a dome cooling chamber 13. One end of the annular top plate 19 is arranged on the vertical circumferential cylinder 28, and a first gap is formed between the other end of the annular top plate 19 and the lifting channel 3 of the safety container 9. This not only realizes the installation of the annular top plate 19, but also allows the cooling airflow in the dome cooling chamber 13 to flow out through the first gap 20, thereby forming an air outlet of the dome cooling chamber 13.

[0075] like Figure 6-Figure 7There are multiple guide plates 21 distributed at intervals in the cavity, and the extension direction of the guide plate 21 is set at an angle with the radial direction, that is, an angle O, and the angle O ranges from 30 degrees to 45 degrees. Of course, it can also be adjusted as needed. The lower end of the extended edge of the guide plate 21 is located above the arc dome 5 and has a second gap 22 with the arc dome 5. The size of the second gap 22 can be set as needed, such as 0.1m-0.2m. A plurality of guide plates 21 are arranged at intervals in the cooling cavity so as to guide the cooling airflow on the end surface of the arc dome 5. The extension direction of the guide plate 21 is arranged at an angle to the radial direction so that the plurality of guide plates 21 are arranged in a spiral shape to enhance the airflow disturbance and the heat exchange. The extension edge of the guide plate 21 is located above the arc dome 5 and has a second gap 22 with the arc dome 5. The second gap 22 is located above the arc dome 5, that is, the second gap 22 is formed above the arc, which can allow the cooling airflow to flow through, so that the airflow flows from one area of ​​the arc dome 5 to another area, so that the airflow rotates and passes over the entire arc dome 5. The lower end of the extension edge of the guide plate 21 can be set to an arc to adapt to the arc dome 5.

[0076] like Figure 6 As shown, the guide plate 21 is fixed on the middle partition 14, the outer wall of the guide plate 21 is connected to the outer wall of the dome cooling cavity 13, and the end of the extended edge has a third gap 23 with the hanging channel 3. The end of the extended edge of the guide plate 21 also has a third gap 23 with the hanging channel 3, so that the cooling airflow gradually rises while rotating and passing over the arc dome 5, and flows out of the dome cooling cavity 13 from the third gap 23 between the hanging channel 3.

[0077] like Figure 2-Figure 3 As shown, two air inlets 16 are arranged at intervals at the bottom of the cylindrical shell, and the two air inlets 16 are located on the same diameter; two air outlets 29 are arranged at intervals at the upper part of the cylindrical shell, and the two air outlets 29 are located on the same diameter; the two air outlets 29 are located on the same diameter, and the projection of the diameter of the two air outlets 29 is perpendicular to the projection of the diameter of the two air inlets 16, and the outer sides of the corresponding two air outlets 29 on the middle partition are respectively provided with connecting holes 15; specifically, as shown in FIG. Figure 4 As shown, in the circumferential direction, the two air inlets 16 are respectively located at 0 degrees and 180 degrees; the two air outlets 29 and the connecting hole 15 are respectively located at positive 90 degrees and negative 90 degrees; of course, in other embodiments, the orientation of the two air inlets 16 and the orientation of the two air outlets 29 can be adjusted as needed. With the arrangement of the two air inlets 16 and the two air outlets 29, the cooling airflow enters the annular cooling cavity 12 through the two air inlets 16, cools the entire outer wall of the vertical cylinder 4, flows out of the annular cooling cavity 12 through the two air outlets 29, and enters the dome cooling cavity 13 through the connecting hole 15, that is, a two-in and two-out structure is formed in the annular cooling cavity 12, as shown in FIG. Figure 4As shown, the cooling air flow enters the annular cooling cavity 12 through two air inlets 16. The air flow at each air inlet 16 is divided into two streams, which are respectively guided by the deflector 18 from the lower notch to the upper notch and from the upper notch to the lower notch, and finally flow out of the annular cooling cavity 12 from the air outlet 29. The cooling air flow passes over the outer wall of the vertical cylinder 4 to form an S-shaped motion trajectory, and covers the entire outer wall surface of the vertical cylinder 4 after multiple deflections by the deflector 18, thereby achieving the goal of cooling the vertical cylinder 4.

[0078] Of course, in other embodiments, an air inlet 16 may be provided at the bottom of the cylindrical shell, and an air outlet 29 may be provided at the upper part of the cylindrical shell, the projection of the air outlet and the projection of the air inlet 16 being located on the same diameter; a connecting hole 15 may be provided on the middle partition plate 14 corresponding to the outer side of the air outlet 29, that is, a single-inlet and single-outlet structure may be adopted, such as Figure 5 As shown, the cooling airflow at the air inlet 16 flows to both sides through the deflection of the deflector 18, from the lower notch to the upper notch and from the upper notch to the lower notch, and finally flows out of the annular cavity from the air outlet 29 and enters the dome cooling cavity 13 through the connecting hole 15. The cooling airflow also passes over the outer wall of the vertical cylinder 4 to form an S-shaped motion trajectory, and covers the entire outer wall surface of the vertical cylinder 4 after multiple deflections of the deflector 18, thereby achieving the goal of cooling the vertical cylinder 4.

[0079] The front end of the air inlet 16 can be connected to a refrigerator to achieve a constant temperature and a constant flow of the cooling air inlet 16. The center of the air inlet 16 can be set to be 0.3m-0.4m away from the bottom edge of the cylindrical shell 30; the center of the air outlet 29 can be designed to be 0.3-0.4m away from the top edge of the cylindrical shell 30.

[0080] like Figure 6-Figure 7 As shown, a double 90-degree elbow is provided on the connecting hole 15, and the double 90-degree elbow includes a first elbow portion 25 connected to the air outlet 29, a straight pipe portion connected to the connecting hole 15, and a second elbow portion 26 extending into the dome cooling cavity, and the outlet of the second elbow portion 26 has a deflection angle relative to the inlet of the first elbow portion 25. By providing a double 90-degree elbow in the connecting hole 15, the cooling airflow of the annular cooling cavity 12 is smoothly introduced into the dome cooling cavity 13, and the outlet of the second elbow portion 26 has a deflection angle C relative to the inlet of the first elbow portion 25, so that the direction of the cooling airflow at the outlet of the second elbow has a component along the circumferential direction and radial direction of the arc dome 5. Under the guidance of the guide plate in the dome cooling cavity, the cooling airflow can flow along the circumferential direction of the arc dome 5 and can pass over the arc dome 5 in the radial direction, so that the cooling airflow passes over the entire arc dome 5 to achieve the purpose of cooling the arc dome 5; preferably, the angle range of the deflection angle C is 60 degrees to 85 degrees.

[0081] The air circulation device 11 is a circulating fan, and an axial flow fan can be selected for the circulating fan. The circulating fan is arranged at the inner edge of the safety container 9, and the air outlet end of the circulating fan is arranged toward the center of the safety container 9. On the one hand, it can directly enhance the heat dissipation of the heating equipment in the safety container 9 and reduce the temperature of the heating equipment itself. On the other hand, it can accelerate the flow of gas inside the safety container 9, enhance the transfer of heat inside the safety container 9 to the safety container 9, promote the uniformity of the gas temperature inside the safety container 9, and reduce the ambient temperature inside the safety container 9.

[0082] Furthermore, the air outlet of the circulating fan can directly blow the equipment that needs to be cooled. The external circulation fan is placed at a certain specific height, such as the height of the control rod drive motor or the height of the primary pump drive motor, which can directly enhance the heat dissipation of the equipment and reduce the temperature of the equipment itself.

[0083] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A cooling system for a safety container, the cooling system comprising a safety container and a shielding wall surrounding the safety container, characterized in that: The cooling system also includes an external ventilation cooling structure arranged between the safety container and the shielding wall and an air circulation device in the safety container. The external ventilation cooling structure includes an annular cooling cavity for cooling the vertical cylinder of the safety container and a dome cooling cavity for cooling the arc-shaped dome. An intermediate partition is arranged between the annular cooling cavity and the dome cooling cavity. A connecting hole is arranged on the intermediate partition. The bottom of the annular cooling cavity is connected to the air inlet, and the annular cooling cavity is connected to the dome cooling cavity through the connecting hole. The top of the dome cooling cavity is connected to the air outlet arranged on the upper part of the shielding wall.

2. The cooling system according to claim 1, characterized in that A cylindrical shell coaxial with the vertical cylinder is arranged between the vertical cylinder and the shielding wall, and the annular cooling cavity is formed between the cylindrical shell and the vertical cylinder.

3. The cooling system according to claim 2, characterized in that A plurality of vertically arranged baffles are arranged in the annular cooling cavity. The baffles are spaced apart along the circumference of the annular cooling cavity. The dimensions of the baffles along the axial direction of the vertical cylinder are smaller than the height of the annular cooling cavity.

4. The cooling system according to claim 3, characterized in that The inner side of the baffle is arranged on the vertical cylinder, and the outer side of the baffle is arranged on the cylindrical shell. A plurality of the baffles alternately form notches at the top and bottom ends of the annular cooling cavity.

5. The cooling system according to claim 2, characterized in that: An annular top plate parallel to the middle partition is arranged above the middle partition, a vertical circumferential tube is connected between the middle partition and the annular top plate, the vertical circumferential tube is located on the inner side of the shielding wall, the vertical circumferential tube, the middle partition and the annular top plate and the arc-shaped dome form the dome cooling chamber, one end of the annular top plate is connected to the vertical circumferential tube, and the other end of the annular top plate has a first gap with the lifting channel.

6. The cooling system according to claim 5, characterized in that A plurality of guide plates are spaced apart in the dome cooling cavity, and the extension direction of the guide plates is arranged at an angle with the radial direction; the lower end of the extension edge of the guide plate is located above the arc dome and has a second gap with the arc dome.

7. The cooling system according to claim 6, characterized in that The guide plate is fixed on the middle partition plate, and a third gap is formed between the end of the extending edge and the hoisting channel.

8. The cooling system according to claim 7, characterized in that The bottom of the cylindrical shell is provided with two air inlets at intervals, and the two air inlets are located on the same diameter; the upper part of the cylindrical shell is provided with two air outlets, and the two air outlets are located on the same diameter, and the projection of the diameter of the two air outlets is perpendicular to the projection of the diameter of the two air inlets; the outer sides of the partition corresponding to the two air outlets are respectively provided with connecting holes; Alternatively, an air inlet is provided at the bottom of the cylindrical shell, an air outlet is provided at the upper portion of the cylindrical shell, and the projection of the air outlet is located on the same diameter as the projection of the air inlet; a connecting hole is provided on the partition plate on the outer side of the air outlet.

9. The cooling system according to claim 8, characterized in that The connecting hole is provided with a double 90-degree bend pipe, and the double 90-degree bend pipe includes a first bend pipe portion connected to the air outlet, a straight pipe portion connected to the connecting hole, and a second bend pipe portion extending into the dome cooling cavity, and the outlet of the second bend pipe portion has a deflection angle relative to the inlet of the first bend pipe portion.

10. The cooling system according to claim 1, characterized in that The air circulation device is a circulation fan, which is arranged at the inner edge of the safety container, and the air outlet end of the circulation fan faces the center of the safety container.

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