Containment heat exchange water tank cooling device and containment heat exchange water tank cooling system

Abstract

The application relates to a containment heat exchange water tank cooling device and a containment heat exchange water tank cooling system. The containment heat exchange water tank cooling device comprises a condensation recovery surrounding plate, an outer surrounding plate and an inner surrounding plate. The condensation recovery surrounding plate is arranged above the open end of the heat exchange water tank and defines a steam passage. The condensation recovery surrounding plate comprises a first surrounding plate arranged corresponding to the outer side plate of the heat exchange water tank and a second surrounding plate arranged corresponding to the inner side plate of the heat exchange water tank. The outer surrounding plate, the heat exchange water tank and the first surrounding plate define a first cooling passage. The inner surrounding plate is arranged on the side of the second surrounding plate far away from the first surrounding plate and defines a second cooling passage with the second surrounding plate. The inner surrounding plate and the containment define a collecting passage. The air naturally circulates between the first cooling passage, the second cooling passage and the collecting passage, the air flow resistance is small, the structure is reasonable, the heat exchange efficiency is high, the heat exchange water tank can be cooled, the water level of the heat exchange water tank can be maintained, and the heat exchange water tank can be continuously operated for a long time.

Description

Technical Field

[0001] This invention relates to the field of containment cooling technology, and in particular to a containment hot water tank cooling device and a containment hot water tank cooling system. Background Technology

[0002] When a pipeline ruptures at a nuclear power plant, the high-temperature, high-pressure coolant in the primary coolant loop will be released into the containment. In addition, after the reactor is shut down, the reactor core continues to release decay heat, which heats the water in the crater, causing the temperature and pressure inside the containment to rise. If the pressure is not effectively reduced, it may exceed the design limits of the containment.

[0003] The passive containment cooling system (PCCS) of a nuclear power plant is used to reduce the temperature and pressure within the containment after an accident, thereby ensuring the integrity of the containment. Typically, a portion of the PCCS equipment is housed in a water tank to dissipate its heat, improving the PCCS's heat exchange efficiency and increasing its heat exchange backup margin. After an accident, the water tank will heat up rapidly, and to prevent the tank's heat exchange function from degrading or failing, further heat dissipation from the tank is necessary.

[0004] In existing technologies, heat removal from a water tank can be achieved through both active and passive methods. The active method involves connecting a heat exchanger to the water tank, but this requires a power pump and will fail if a power outage occurs. The passive method involves arranging heat exchange equipment such as spiral heat exchange tubes inside the water tank, allowing air to carry away the heat from the liquid as it passes through the tubes. However, this method has drawbacks: the installation of these tubes occupies significant space within the tank, severely interfering with the layout of the heat exchange system and hindering subsequent maintenance; furthermore, due to the structural characteristics of the spiral heat exchange tubes, air must overcome considerable flow resistance, resulting in low heat exchange efficiency; and dust can accumulate inside the tubes during airflow, potentially causing heat exchange failure. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an improved containment hot water tank cooling device and containment hot water tank cooling system.

[0006] The technical solution adopted by the present invention to solve its technical problem is: to provide a containment hot water tank cooling device, which includes a condensate recovery enclosure, an outer enclosure, and an inner enclosure;

[0007] The condensation recovery enclosure forms a steam passage above the open end of the hot water tank of the passive containment cooling system; the condensation recovery enclosure includes a first enclosure corresponding to the outer side panel of the hot water tank and a second enclosure corresponding to the inner side panel of the hot water tank.

[0008] The outer plate is installed on the side of the first plate away from the second plate, and is spaced apart from the hot water tank and the first plate respectively; the outer plate and the hot water tank, and the outer plate and the first plate together define a first cooling channel;

[0009] The inner cladding is disposed on the side of the second cladding away from the first cladding and is spaced apart from the second cladding; a second cooling channel is defined between the inner cladding and the second cladding.

[0010] The inner enclosure is at least partially spaced from the containment vessel; a flow collection channel is defined between the inner enclosure and the containment vessel.

[0011] The second cooling channel is connected to the collection channel.

[0012] Preferably, the second enclosure includes a straight section and an arc-shaped section;

[0013] One end of the arc-shaped section of the second enclosure is connected to the inner side panel of the hot water exchange tank, and the other end is connected to the straight section of the second enclosure.

[0014] The straight section of the second enclosure extends away from the arc-shaped section at one end along the flow direction of the steam generated inside the hot water exchange tank.

[0015] The distance between the arc-shaped section of the second enclosure and the liquid surface of the hot water tank gradually decreases along the direction of the arc-shaped section of the second enclosure away from the straight section of the second enclosure.

[0016] Preferably, the containment hot water tank cooling device further includes multiple ribs;

[0017] The adjacent ribs are spaced apart; each rib is disposed between the outer perimeter plate and the hot water exchange tank; and / or, each rib is disposed between the outer perimeter plate and the first enclosure plate.

[0018] Preferably, at least one of the two opposite sides of each rib in the thickness direction is provided with a rough layer, protrusions and / or fin structures.

[0019] Preferably, the inner cladding panel includes opposing upper and lower ends;

[0020] The lower end of the inner enclosure is spaced apart from the second enclosure, and the lower end of the inner enclosure is at least partially spaced apart from the containment.

[0021] The upper end of the inner enclosure is positioned higher than the opening end of the condensate recovery enclosure away from the hot water exchange tank.

[0022] Preferably, a water collecting component is provided at the upper end of the inner cladding plate, and the water collecting component is correspondingly located above the opening end of the hot water exchange tank to guide the condensate to the hot water exchange tank.

[0023] Preferably, the radial dimension of the flow collection channel gradually increases from the lower end of the inner circumference plate to the upper end of the inner circumference plate.

[0024] Preferably, the side plate of the water tank away from the containment vessel, the first enclosure plate, and the outer perimeter plate all extend in a vertical direction.

[0025] The present invention also provides a containment hot water tank cooling system, which includes the containment hot water tank cooling device described in any of the above claims and a hot water tank connected to the containment hot water tank cooling device.

[0026] Preferably, the outer side plate of the hot water exchange tank has a rough layer, protrusions, and / or fin structure on one surface facing the outer perimeter plate.

[0027] The present invention has at least the following beneficial effects: no external power supply is required; the condensation recovery enclosure, outer enclosure, and inner enclosure are arranged around the heat exchange tank, without occupying the internal space of the heat exchange tank, which facilitates the installation and maintenance of the condenser of the heat exchange system; the heat exchange tank is cooled by natural convection circulation of air between the first cooling channel, the second cooling channel, and the collection channel, resulting in low air flow resistance, a more reasonable structure, and higher heat exchange efficiency; the lower part of the first cooling channel continuously cools the heat exchange tank, while the upper part of the first cooling channel and the second cooling channel are located on opposite sides of the steam channel, so that most of the steam in the steam channel condenses and flows back to the heat exchange tank after encountering the cold, thereby simultaneously cooling the heat exchange tank and recovering steam. While cooling the heat exchange tank, it also ensures that the heat exchange tank maintains a sufficient water level, ensuring that the heat exchange tank can operate continuously for a long time. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the structure of a containment hot water tank cooling system according to an embodiment of the present invention;

[0030] Figure 2 This is a cross-sectional structural schematic diagram of a containment hot water tank cooling device according to an embodiment of the present invention;

[0031] Figure 3 yes Figure 2 A partially enlarged schematic diagram of the inner enclosure and water collection components of the containment hot water tank cooling device shown in the diagram;

[0032] Figure 4 yes Figure 2The diagram shows a structural schematic of the containment hot water tank cooling device from another perspective. Detailed Implementation

[0033] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0034] Figure 1 An embodiment of the present invention is shown: a containment hot water tank cooling system, which is a cooling system centered on a hot water tank 1, used to cool the condenser 7 of the passive containment cooling system (PCCS) to remove heat from the PCCS. The containment hot water tank cooling system includes a containment hot water tank cooling device (hereinafter referred to as the cooling device) and a hot water tank 1 connected to the cooling device.

[0035] The passive containment cooling system (PCCS) includes a condenser 7 housed in the heat exchange tank 1 and an evaporator 8 housed inside the containment 9. The condenser 7 and evaporator 8 are connected by pipes to form a heat exchange loop. The condenser 7 and evaporator 8 constitute the heat exchange system. The height of the evaporator 8 is lower than that of the condenser 7 to create an effective height difference. Specifically, a one-loop system 90 is provided inside the containment 9. The evaporators 8 are arranged in a fan shape on the inner wall of the containment 9. The upper part of the evaporator 8 is connected to a riser pipe, and the riser section is connected to a first connecting pipe, which penetrates the side wall of the containment 9 and connects to the condenser 7. The lower part of the condenser 7 is connected to a downcomer pipe, which is connected to a second connecting pipe, which penetrates the side wall of the containment 9 and connects to the evaporator 8, forming a closed heat exchange loop. During normal operation, the high-temperature, high-pressure mixture inside containment 9 heats evaporator 8, causing the internal medium to evaporate into a gaseous state. This gas then flows along the riser and the first connecting pipe into condenser 7 outside containment 9. Condenser 7 is cooled in heat exchange tank 1, where the gaseous phase condenses into a liquid phase, which then flows back to evaporator 8 through downcomer and the second connecting pipe. This natural circulation, based on density differences, carries heat from inside containment 9 through evaporator 8 to condenser 7 outside containment 9, achieving cooling and depressurization of containment 9. The heat exchange tank 1 of the containment heat exchange tank cooling system is used to remove heat from condenser 7, and the cooling device of the containment heat exchange tank cooling system is used to remove heat from heat exchange tank 1.

[0036] In this embodiment, the cooling device and the hot water tank 1 are integrally formed, and the overall structure formed by the cooling device and the hot water tank 1 is fixed to the outer wall of the containment vessel 9. In other embodiments, the cooling device and the hot water tank 1 may be spliced ​​together.

[0037] Furthermore, in this embodiment, the hot water exchange tank 1 is an annular hot water exchange tank disposed on the outer wall of the containment vessel 9. Specifically, the inner side plate of the hot water exchange tank 1 is fixed to the outer wall of the containment vessel 9. It should be noted that the side plate of the hot water exchange tank 1 away from the containment vessel 9 is called the outer side plate, and the side plate of the hot water exchange tank 1 closer to the containment vessel 9 is called the inner side plate. In this way, the hot water exchange tank 1 is shaped to correspond to the containment vessel 9 and has a sufficiently large volume to ensure that the hot water exchange tank 1 has sufficient heat exchange capacity. Of course, in other embodiments, the hot water exchange tank 1 can also be of other shapes.

[0038] After the accident, the water in the hot water exchange tank 1 was quickly heated to boiling, causing the water level to drop continuously. To prevent the heat exchange function of the hot water exchange tank 1 from deteriorating or failing, it is necessary to remove the heat from the hot water exchange tank 1. According to the design requirements of the hot water exchange tank 1, its water volume should be sufficient for 72 hours of operation after the accident. The cooling device of the present invention can not only remove the heat from the hot water exchange tank 1, but also recover the steam generated after the water boils, which can meet the design requirements of the hot water exchange tank 1 and ensure that the hot water exchange tank 1 can operate continuously for a long time.

[0039] like Figures 2 to 4 As shown, a cooling device according to an embodiment of the present invention is used for the hot water tank of the containment cooling system. The cooling device includes a condensate recovery enclosure, an outer enclosure 3, and an inner enclosure 4. It should be noted that, in the working state, the hot water tank 1 is installed on the outer wall of the containment 9. The side plate of the hot water tank 1 away from the containment 9 is called the outer side plate, and the side plate of the hot water tank 1 closer to the containment 9 is called the inner side plate.

[0040] A condensate recovery enclosure forms a steam channel 54 above the opening of the hot water tank 1 in the containment cooling system. Specifically, the inner wall of the condensate recovery enclosure forms the steam channel 54. Steam generated after the water in the hot water tank 1 boils rises along the steam channel 54. The condensate recovery enclosure includes a first enclosure 21 and a second enclosure 22. The first enclosure 21 is correspondingly disposed to the outer side panel of the hot water tank 1. The second enclosure 22 is correspondingly disposed to the inner side panel of the hot water tank 1. In this embodiment, the first enclosure 21 and the outer side panel of the hot water tank 1 are integrally formed, and the second enclosure 22 and the inner side panel of the hot water tank 1 are integrally formed. The overall structure formed by the second enclosure 22, the first enclosure 21, and the hot water tank 1 is fixed to the outer wall of the containment 9. In other embodiments, the first enclosure 21 and the outer side panel of the hot water tank 1 may be spliced ​​together, and the second enclosure 22 and the inner side panel of the hot water tank 1 may be spliced ​​together.

[0041] The outer perimeter plate 3 surrounds the side of the first perimeter plate 21 away from the second perimeter plate 22, and is spaced apart from the hot water tank 1 and the first perimeter plate 21, respectively. The outer perimeter plate 3 and the hot water tank 1, and the outer perimeter plate 3 and the first perimeter plate 21 together define the first cooling channel 51. The first cooling channel 51 is used to cool the steam in the steam channel 54, so that it condenses into a liquid phase and can flow back to the hot water tank 1 under the action of gravity.

[0042] The inner enclosure 4 is located on the side of the second enclosure 22 away from the first enclosure 21, and is spaced apart from the second enclosure 22. The inner enclosure 4 and the second enclosure 22 define a second cooling channel 52. The second cooling channel 52 is used to cool the steam in the steam channel 54, so that the steam condenses into a liquid phase and can flow back to the hot water exchange tank 1 under the action of gravity.

[0043] The inner enclosure 4 is at least partially spaced from the outer wall of the containment vessel 9, and the side of the inner enclosure 4 closest to the containment vessel 9 defines a flow-collecting channel 53 between the inner enclosure 4 and the containment vessel 9. That is, the inner enclosure 4 can be partially or completely spaced from the outer wall of the containment vessel 9. Specifically, the inner enclosure 4 can be an annular plate surrounding the outer wall of the containment vessel 9, and connecting ribs can be provided between the inner wall surface of the inner enclosure 4 and the outer wall of the containment vessel 9 to fix the inner enclosure 4 to the outer wall of the containment vessel 9. Alternatively, the inner enclosure 4 can be a curved arc plate with its edge connected to the outer wall of the containment vessel 9, and its arc surface forms a flow-collecting channel 53 between the arc surface and the outer wall of the containment vessel 9. The second cooling channel 52 is connected to the flow-collecting channel 53. The flow-collecting channel 53 allows air above the heat exchange tank 1 to be drawn into it under the action of density difference (pressure difference), and then rises through the second cooling channel 52, forming a natural air convection phenomenon.

[0044] The operation of the cooling device can be divided into a pre-boiling operation and a boiling operation. The pre-boiling operation refers to the cooling of the hot water exchange tank 1 mainly by the air flow in the first cooling channel 51 before the liquid in the hot water exchange tank 1 boils. The boiling operation refers to the cooling of the hot water exchange tank 1 by the combined cooling of the second cooling channel 52 and the first cooling channel 51 after the liquid in the hot water exchange tank 1 boils. Figure 2 The arrows in the diagram indicate the direction of airflow within each channel.

[0045] Pre-boiling operation: Since heat from the condenser 7 is transferred to the heat exchange tank 1, the temperature of the heat exchange tank 1 is higher than the ambient temperature. At this time, the air in the first cooling channel 51, heated by the outer wall of the heat exchange tank 1, experiences a temperature increase and a decrease in density, flowing upwards along the first cooling channel 51. Due to the low pressure in the channel, outside air is drawn into the first cooling channel 51 from the bottom inlet under the pressure difference. Within the first cooling channel 51, the air gradually heats up and continues to rise, eventually being rapidly discharged from the first cooling channel 51. During this process, the cold air drawn in from the bottom inlet of the first cooling channel 51 cools the outer wall of the heat exchange tank 1, thus suppressing the rise in water temperature and improving the heat exchange efficiency of the containment cooling system.

[0046] Boiling process: Although the first cooling channel 51 inhibits the rise in water temperature in the hot water exchange tank 1, the containment cooling system continues to operate efficiently, and the large amount of heat released by the condenser 7 in the hot water exchange tank 1 may still heat the hot water exchange tank 1 to boiling. At this time, the first cooling channel 51 still has a cooling function for the hot water exchange tank 1, and the principle is consistent with that described in the process before boiling. On this basis, the liquid in the hot water exchange tank 1 continues to boil, and the generated steam is discharged through the steam channel 54. The air temperature above the hot water exchange tank 1 rises and the density decreases. The air in the collection channel 53 is relatively farther away from the second enclosure 22, and the air temperature in it is relatively lower and the density is higher. Under the action of density difference (pressure difference), the air above the hot water exchange tank 1 is drawn in from the collection channel 53. Similarly, the second cooling channel 52 is relatively closer to the second enclosure 22. Under the action of density difference (pressure difference), the air in the collection channel 53 enters the second cooling channel 52 and its temperature rises, and then continues to rise, forming natural air convection. During air convection, heat is continuously carried away from the second enclosure 22, cooling it down. Consequently, the second cooling channel 52 and the first cooling channel 51, located on opposite sides of the steam channel 54, continuously cool the second enclosure 22 and the first enclosure 21, respectively. The high-temperature steam in the steam channel 54 condenses into a liquid film upon encountering the low-temperature walls of the second enclosure 22 and the first enclosure 21, falling back into the hot water tank 1.

[0047] During the entire operation, the lower part of the first cooling channel 51 continuously cools the hot water tank 1. The upper part of the first cooling channel 51 and the second cooling channel 52 are located on opposite sides of the steam channel 54, so that most of the steam in the steam channel 54 is condensed and flows back to the hot water tank 1. This simultaneously cools the hot water tank 1 and recovers steam, achieving the effect of cooling the hot water tank 1 while maintaining a sufficient water level.

[0048] In summary, compared with the prior art, the present invention has at least the following beneficial effects: no external power supply is required; the condensation recovery enclosure, outer enclosure 3, and inner enclosure 4 surround the hot water exchange tank 1 without occupying the internal space of the hot water exchange tank 1, which facilitates the installation of the condenser 7 of the heat exchange system and the maintenance of the condenser 7; relying on the natural convection circulation of air between the first cooling channel 51, the second cooling channel 52, and the collection channel 53, the air flow resistance is small, the structure is more reasonable, and the heat exchange efficiency is higher; the lower part of the first cooling channel 51 continuously cools the hot water exchange tank 1, and the upper part of the first cooling channel 51 and the second cooling channel 52 are located on opposite sides of the steam channel 54, so that most of the steam in the steam channel 54 condenses and flows back to the hot water exchange tank 1 after encountering the cold, thereby simultaneously cooling the hot water exchange tank 1 and recovering steam. While cooling the hot water exchange tank 1, it can also ensure that the hot water exchange tank 1 maintains a sufficient water level, ensuring that the hot water exchange tank 1 can operate continuously for a long time.

[0049] In this embodiment, the outer perimeter plate 3, the first enclosure plate 21, and the outer perimeter plate of the hot water tank 1 all extend vertically, so that the first cooling channel 51 extends vertically and has a certain vertical slope. Air rises along the first cooling channel 51, causing the phenomenon of enhanced air convection (chimney effect), which is conducive to accelerating the rise of air in the first cooling channel 51 and improving heat exchange efficiency.

[0050] In this embodiment, as Figure 2 As shown, the second enclosure 22 includes a straight section and an arc section.

[0051] One end of the arc-shaped section of the second enclosure 22 is connected to the inner side panel of the hot water exchange tank 1. As mentioned above, the second enclosure 22 and the inner side panel of the hot water exchange tank 1 can be integrally formed or spliced ​​together. Therefore, specifically, one end of the arc-shaped section of the second enclosure 22 and the inner side panel of the hot water exchange tank 1 can be integrally formed or spliced ​​together.

[0052] The straight section extends along the flow direction of the steam generated in the hot water exchange tank 1 and connects to the opposite end of the arc-shaped section of the second enclosure 22. That is, the straight section of the second enclosure 22 extends vertically. The distance between the arc-shaped section of the second enclosure 22 and the liquid surface of the hot water exchange tank 1 gradually decreases along the arc-shaped section of the second enclosure 22 away from the straight section of the second enclosure 22. As a result, droplets formed after the steam in the steam channel 54 condenses or droplets splashed when the water in the hot water exchange tank 1 boils can be recovered into the hot water exchange tank 1 under the guiding effect of the arc-shaped section of the second enclosure 22.

[0053] In this embodiment, the cooling device further includes multiple ribs 6. Adjacent ribs 6 are spaced apart. Each rib 6 is disposed between the outer plate 3 and the hot water tank 1, and each rib 6 is also located between the outer plate 3 and the first enclosure plate 21. That is, one edge of each rib 6 is connected to both the first enclosure plate 21 and the outer side plate of the hot water tank 1, and extends along the first enclosure plate 21 and the outer side plate of the hot water tank 1. Alternatively, in other embodiments, each rib 6 may only be disposed between the outer plate 3 and the hot water tank 1. That is, one edge of each rib 6 is only connected to the outer side plate of the hot water tank 1, and each rib 6 extends only along the outer side plate of the hot water tank 1. Furthermore, in other embodiments, each rib 6 may only be disposed between the outer plate 3 and the first enclosure plate 21. That is, one edge of each rib 6 is only connected to the first enclosure plate 21, and each rib 6 extends only along the first enclosure plate 21.

[0054] Furthermore, at least one of the two opposite sides (hereinafter referred to as sides) of each rib 6 in the thickness direction is provided with a roughening layer, protrusions, and / or fin structures. It should be noted that the thickness direction of each rib 6 refers to the direction of its smallest dimension measurement in its three dimensions. In this embodiment, both opposite sides of each rib 6 in the thickness direction are provided with a roughening layer, protrusions, and / or fin structures. In other embodiments, only one side of each rib 6 may be provided with a roughening layer, protrusions, and / or fin structures. Specifically, only a roughening layer may be provided on the rib 6; or only protrusions may be provided on the rib 6; or only fin structures may be provided on the rib 6; or a roughening layer, protrusions, and fin structures may be provided simultaneously on the rib 6. This can create turbulence, disrupt the airflow boundary layer, and thus enhance heat transfer, thereby increasing the heat transfer efficiency between the air and the rib 6. The enhanced heat transfer effect is optimal when a roughening layer, protrusions, and fin structures are provided simultaneously on the rib 6.

[0055] Similarly, a rough layer, protrusions, and fin structures can also be provided on the outer surface of the hot water exchange tank 1 facing the outer peripheral plate 3. Alternatively, only a rough layer can be provided on the outer surface of the hot water exchange tank 1; or only protrusions can be provided on the outer surface of the hot water exchange tank 1; or only a fin structure can be provided on the outer surface of the hot water exchange tank 1. The enhanced heat exchange effect is best achieved when a rough layer, protrusions, and fin structures are all provided on the outer surface of the hot water exchange tank 1 facing the outer peripheral plate 3.

[0056] Furthermore, the rib plate 6 is made of metal, which has good heat exchange capacity. In this case, the rib plate 6 can be welded to the outer side plate and / or the first enclosure plate 21 of the hot water tank 1.

[0057] In this embodiment, the inner cladding 4 includes a connected upper end and a lower end.

[0058] The lower end of the inner enclosure 4 is spaced apart from the second enclosure 22, and the side of the inner enclosure 4 facing the second enclosure 22 defines a second cooling channel 52. Simultaneously, the lower end of the inner enclosure 4 is at least partially spaced apart from the containment 9, and the side of the inner enclosure 4 facing away from the second enclosure 22 defines a flow-collecting channel 53. The second cooling channel 52 and the flow-collecting channel 53 are connected at the gap formed between the lower end of the inner enclosure 4 and the second enclosure 22. Specifically, the lower end of the inner enclosure 4 is spaced apart from the arcuate section of the second enclosure 22.

[0059] The upper end of the inner enclosure 4 is positioned above the opening end of the condensate recovery enclosure away from the hot water exchange tank 1. Specifically, the condensate recovery enclosure surrounds the opening end of the hot water exchange tank 1 and includes two opposing opening ends, one of which is close to the hot water exchange tank 1 and the other is away from it. The two opposing opening ends of the condensate recovery enclosure are connected, and its inner wall defines a steam passage 54. The upper end of the inner enclosure 4 is positioned above the opening end of the condensate recovery enclosure away from the hot water exchange tank 1, which facilitates the intake of air escaping from the condensate recovery enclosure to the upper part of the condensate recovery enclosure into the collection channel 53.

[0060] Furthermore, a water collecting component 40 is provided at the upper end of the inner enclosure 4, correspondingly positioned above the opening of the hot water exchange tank 1, guiding condensate water into the hot water exchange tank 1. In this way, steam escaping above the opening of the hot water exchange tank 1 can be blocked by the water collecting component 40, ultimately condensing and flowing back into the hot water exchange tank 1. The water collecting component 40, the first enclosure 21, and the second enclosure 22 work together to ensure that the vast majority of steam condenses and flows back into the hot water exchange tank 1.

[0061] The inner enclosure 4 and the containment vessel 9 together form a flow channel 53. Furthermore, the radial dimension of the flow channel 53 gradually increases from the lower end to the upper end of the inner enclosure 4; that is, the inner enclosure 4 is inclined to facilitate the introduction of air above the opening of the hot water tank 1. It should be noted that "radial" can be referenced to the radial direction of the containment vessel 9. The lower end of the inner enclosure 4 is closer to the second enclosure 22 than the upper end of the inner enclosure 4.

[0062] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A containment hot water tank cooling device, characterized in that, Includes condensation recovery enclosure, outer enclosure (3), and inner enclosure (4); The condensation recovery enclosure forms a steam passage (54) above the opening of the hot water tank (1) of the passive containment cooling system; the hot water tank (1) is located on the outer wall of the containment (9); the condensation recovery enclosure includes a first enclosure (21) corresponding to the outer wall of the hot water tank (1) and a second enclosure (22) corresponding to the inner wall of the hot water tank (1); the first enclosure (21) is integrally formed or spliced ​​with the outer wall of the hot water tank (1), and the second enclosure (22) is integrally formed or spliced ​​with the inner wall of the hot water tank (1); The outer plate (3) is arranged on the side of the first plate (21) away from the second plate (22), and is spaced apart from the hot water tank (1) and the first plate (21); the outer plate (3) and the hot water tank (1) and the outer plate (3) and the first plate (21) together define the first cooling channel (51). The inner enclosure (4) is disposed on the side of the second enclosure (22) away from the first enclosure (21) and spaced apart from the second enclosure (22); a second cooling channel (52) is defined between the inner enclosure (4) and the second enclosure (22). The inner enclosure (4) is at least partially spaced from the containment vessel (9); a flow collection channel (53) is defined between the inner enclosure (4) and the containment vessel (9). The second cooling channel (52) and the collection channel (53) are connected.

2. The containment hot water tank cooling device according to claim 1, characterized in that, The second enclosure (22) includes a straight section and an arc section; One end of the arc-shaped section of the second enclosure (22) is connected to the inner side panel of the hot water tank (1), and the other end is connected to the straight section of the second enclosure (22); The straight section of the second enclosure (22) extends away from the arc-shaped section at one end along the flow direction of the steam generated in the hot water exchange tank (1); The distance between the arc-shaped section of the second enclosure (22) and the liquid surface of the hot water tank (1) gradually decreases along the direction of the arc-shaped section of the second enclosure (22) away from the straight section of the second enclosure (22).

3. The containment hot water tank cooling device according to claim 1, characterized in that, The containment hot water tank cooling device also includes multiple ribs (6). The adjacent ribs (6) are spaced apart; each rib (6) is disposed between the outer perimeter plate (3) and the hot water tank (1); and / or, each rib (6) is disposed between the outer perimeter plate (3) and the first enclosure plate (21).

4. The containment hot water tank cooling device according to claim 3, characterized in that, At least one of the two opposite sides of each rib (6) in the thickness direction is provided with a rough layer and / or protrusions.

5. The containment hot water tank cooling device according to claim 1, characterized in that, The inner panel (4) includes an upper end and a lower end opposite to each other; The lower end of the inner enclosure (4) is spaced opposite to the second enclosure (22), and the lower end of the inner enclosure (4) is at least partially spaced from the containment (9). The upper end of the inner enclosure (4) is positioned higher than the opening end of the condensation recovery enclosure away from the hot water exchange tank (1).

6. The containment hot water tank cooling device according to claim 5, characterized in that, The upper end of the inner enclosure (4) is provided with a water collection component (40), which is correspondingly located above the opening end of the hot water exchange tank (1) to guide the condensate to the hot water exchange tank (1).

7. The containment hot water tank cooling device according to claim 5, characterized in that, The radial dimension of the flow collection channel (53) gradually increases from the lower end of the inner circumference plate (4) to the upper end of the inner circumference plate (4).

8. The containment hot water tank cooling device according to any one of claims 1 to 7, characterized in that, The side panel of the water tank away from the containment vessel (9), the first enclosure panel (21), and the outer enclosure panel (3) all extend in a vertical direction.

9. A containment hot water tank cooling system, characterized in that, Includes the containment hot water tank cooling device as described in any one of claims 1 to 8, and the hot water tank (1) connected to the containment hot water tank cooling device.

10. The containment hot water tank cooling system according to claim 9, characterized in that, The outer side plate of the hot water tank (1) has a rough layer and / or protrusions on one surface facing the outer perimeter plate (3).

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