Ventilation system and nuclear power plant

Abstract

The utility model provides a kind of ventilation system and nuclear power plant.For nuclear power plant ventilation, including ventilation duct and heating device.The ventilation duct has ventilation passage, ventilation passage has first ventilation end and second ventilation end in ventilation passage extension direction, first ventilation end is used to communicate with outside, and second ventilation end is used to communicate with internal equipment;Ventilation passage has heating passage, and heating device is set in heating passage;First ventilation end is communicated in second ventilation end by heating passage, and heating device can heat gas located in heating passage.The nuclear power plant of the utility model has the ventilation system described above.The ventilation system and nuclear power plant of the utility model can further reduce the possibility of wind and snow entering the heating passage, reduce the possibility of ice and snow blocking the ventilation duct.

Description

Technical Field

[0001] This utility model relates to the field of environmental control technology for nuclear power plants, specifically to ventilation systems and nuclear power plants. Background Technology

[0002] During winter operation, nuclear power plant ventilation openings need to be protected against snow accumulation to prevent blockage of ventilation ducts and thus avoid unit shutdown. Some technologies use additional shielding on the outside of the louvers to reduce the possibility of ice and snow entering. However, in extreme snow and wind conditions, these measures can still allow a small amount of ice and snow to enter the ventilation ducts, gradually accumulating and eventually blocking them. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a ventilation system that can further reduce the possibility of wind and snow entering the ventilation ducts and reduce the likelihood of ice and snow clogging the ventilation pipes.

[0004] This utility model also proposes a nuclear power plant with the above-mentioned ventilation system.

[0005] A ventilation system according to a first aspect of the present invention is used for ventilation of a nuclear power plant, comprising: A ventilation duct has a ventilation channel, wherein the ventilation channel has a first ventilation end and a second ventilation end in the extending direction of the ventilation channel, the first ventilation end being used to communicate with the outside world, and the second ventilation end being used to communicate with internal equipment. A heating device is provided, wherein the ventilation channel has a heating channel, and the heating device is disposed in the heating channel; the first ventilation end is connected to the second ventilation end through the heating channel, and the heating device is capable of heating the gas located in the heating channel.

[0006] The ventilation system according to this embodiment of the present invention has at least the following beneficial effects: external airflow can sequentially enter the internal equipment through the first ventilation section, the heating channel, and the second ventilation section. Because the heating device has a heating function, ice and snow in the external airflow can be heated and melted after flowing into the heating channel, further reducing the possibility of ice and snow blocking the ventilation channel.

[0007] According to some embodiments of the present invention, the ventilation system further includes a first temperature sensor, a second temperature sensor, and a valve. The first temperature sensor and the second temperature sensor are both disposed in the ventilation channel and are located on both sides of the heating device in the extending direction of the ventilation channel. The valve is located in the ventilation channel and is configured to close when the difference between the temperature detected by the first temperature sensor and the temperature detected by the second temperature sensor is less than a first preset value, so as to block the first ventilation end and the second ventilation end.

[0008] According to some embodiments of the present invention, the valve is located on the side of the heating device closer to the second ventilation end.

[0009] According to some embodiments of the present invention, the ventilation system further includes an alarm device, which is configured to issue an alarm when the difference between the temperature detected by the first temperature sensor and the temperature detected by the second temperature sensor is less than a second preset value, wherein the second preset value is greater than the first preset value.

[0010] According to some embodiments of the present invention, the heating device includes a plurality of first heating tubes; the plurality of first heating tubes are arranged at intervals along a direction perpendicular to the extending direction of the ventilation channel.

[0011] According to some embodiments of the present invention, the heating device further includes a plurality of second heating tubes; the plurality of second heating tubes are arranged at intervals along a direction perpendicular to the extending direction of the ventilation channel; Along the extending direction of the ventilation channel, the second heating tube is located on one side of the first heating tube and is spaced apart from the first heating tube; the first heating tube and the second heating tube are arranged in parallel, and along a direction perpendicular to the extending direction of the ventilation channel, a plurality of the first heating tubes and a plurality of the second heating tubes are arranged alternately.

[0012] According to some embodiments of the present invention, the heating device further includes a plurality of second heating tubes; the plurality of second heating tubes are arranged at intervals along a direction perpendicular to the extending direction of the ventilation channel; Along the extension direction of the ventilation channel, the second heating tube is located on one side of the first heating tube and is spaced apart from the first heating tube; the extension direction of the second heating tube has an angle relative to the extension direction of the first heating tube.

[0013] According to some embodiments of the present invention, the heating device further includes a plurality of heat-conducting fins, and each of the first heating tubes and each of the second heating tubes is connected to the plurality of heat-conducting fins.

[0014] According to some embodiments of the present invention, the heating device further includes a plurality of first heat-conducting fins and a plurality of second heat-conducting fins, each first heating tube being connected to a plurality of first heat-conducting fins, and each second heating tube being connected to a plurality of second heat-conducting fins; Along the extension direction of the first heating tube, a plurality of first heat-conducting fins and a plurality of second heat-conducting fins are arranged alternately.

[0015] According to some embodiments of the present invention, along the extending direction of the first heating tube, the distance between two adjacent first heat-conducting fins is D1, and the distance between adjacent first heat-conducting fins and second heat-conducting fins is D2, where D1 = 2 * D2.

[0016] According to some embodiments of the present invention, the heating device divides the ventilation duct into a first ventilation section and a second ventilation section connected to each other, wherein the first ventilation section has a first ventilation end and the second ventilation section has a second ventilation end; The first ventilation section includes a first sidewall and a plurality of second sidewalls connected to each other. The first sidewall and the plurality of second sidewalls together form the first ventilation section. Along the extension direction of the ventilation channel, one end of the first sidewall is connected to the second ventilation section, and the other end is connected to the ground. The heating channel is disposed on the first sidewall. The interior of the first ventilation section is connected to the interior of the second ventilation section through the heating channel. The upper ends of the plurality of second sidewalls are connected to the first ventilation section. The lower end of at least one second sidewall is spaced from the ground and is lower than the bottom wall of the heating channel, so that the first sidewall, the plurality of second sidewalls and the ground together define a ventilation opening. The interior of the first ventilation section is connected to the outside through the ventilation opening.

[0017] According to some embodiments of the present invention, the distance between the lower end of at least one of the second sidewalls and the ground is greater than or equal to 1000 mm.

[0018] A nuclear power plant according to a second aspect of the present invention includes: The nuclear power plant building houses the nuclear power plant units. As described in any of the above embodiments, the second ventilation end is connected to the interior of the nuclear power plant building.

[0019] The nuclear power plant according to the present invention has at least the following beneficial effects: external airflow can enter the interior of the nuclear power plant building in sequence from the first ventilation section, the heating channel and the second ventilation section. Since the heating device has a heating function, the ice and snow in the external airflow can be heated and melted after flowing into the heating channel, which further reduces the possibility of ice and snow blocking the ventilation channel, and thus helps to avoid the nuclear power plant unit from experiencing a state retreat.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a side view of a ventilation system according to some embodiments of the present invention; Figure 2 for Figure 1 A magnified view shown at point A in the middle; Figure 3 for Figure 1 A cross-sectional view of the ventilation system shown at point BB; Figure 4 for Figure 3 A magnified view shown at point C; Figure 5 This is a partial enlarged view of a ventilation system according to some embodiments of the second aspect of this utility model.

[0022] Figure label: Ventilation duct 100, ventilation channel 110, first ventilation end 111, second ventilation end 112, heating channel 113, first ventilation section 120, first side wall 121, second side wall 122, second ventilation section 130; Heating device 200, first heating tube 210, second heating tube 220, heat-conducting fins 230, first heat-conducting fins 230A, second heat-conducting fins 230B; First temperature sensor 300; Second temperature sensor 400; Valve 500; Ground 10; Ventilation opening 20. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] Please refer to Figures 1 to 5 As shown, this utility model proposes a ventilation system for ventilating nuclear power plants, including a ventilation duct 100 and a heating device 200.

[0029] Please refer to Figure 1 As shown, the ventilation duct 100 has a ventilation channel 110, which has a first ventilation end 111 and a second ventilation end 112 in its extending direction. The first ventilation end 111 is used to communicate with the outside, and the second ventilation end 112 is used to communicate with the internal equipment. External airflow can sequentially enter the internal equipment from the first ventilation section 120, the heating channel 113, and the second ventilation section 130, and then be utilized by the internal equipment.

[0030] Exemplarily, in some embodiments, the ventilation system draws in outside air through ventilation duct 110, processes the outside air, and then introduces the processed air into the internal equipment to cool the internal equipment. In some embodiments, the ventilation system draws in outside air through ventilation duct 110, processes the outside air, and then introduces the processed air into the internal equipment to adjust the pressure of the internal equipment. It should be noted that the purpose of the ventilation system of this invention is not limited to providing gas to internal equipment. In some embodiments, the internal equipment includes an air filtration device that can purify the outside airflow and introduce outside air into the nuclear power plant building for workers to breathe.

[0031] The ventilation channel 110 of this invention also includes a heating channel 113, and the heating device 200 of this invention is disposed in the heating channel 113. The first ventilation end 111 is connected to the second ventilation end 112 through the heating channel 113, and the heating device 200 can heat the gas located in the heating channel 113. Because the heating device 200 has a heating function, ice and snow in the outside airflow can be heated and melted after flowing into the heating channel 113, further reducing the possibility of ice and snow blocking the ventilation channel 110.

[0032] Without departing from the inventive concept of this utility model, those skilled in the art can customize the structure of the heating device 200. Exemplarily, in some embodiments, the heating device 200 includes a heating element laid on the inner wall of the heating channel 113, capable of heating the air flowing through the heating channel 113. The above solution directly installs the heating element on the inner wall of the heating channel 113, making installation relatively simple.

[0033] As a preferred option, please refer to Figures 1 to 4 As shown, in some embodiments, the heating device 200 includes a plurality of first heating tubes 210; along a direction perpendicular to the extending direction of the ventilation channel 110 (i.e., Figure 1 , Figure 3 The heating tubes 210 are arranged at intervals in the vertical direction within the heating channel 113. Because of the intervals between the multiple first heating tubes 210 housed in the heating channel 113, air from the first ventilation end 111 can pass through the spaces between the multiple first heating tubes 210 and flow into the second ventilation end 112. Furthermore, since the multiple first heating tubes 210 are arranged in a direction perpendicular to the extension direction of the ventilation channel 110, the heating device 200 can further heat the gas distributed in a direction perpendicular to the extension direction of the ventilation channel 110, resulting in higher heating efficiency and further reducing the risk of ice and snow in the airflow entering the ventilation channel 110.

[0034] Please refer to Figure 4 , Figure 5 As shown, where Figure 4 The structure of a heating device 200 according to one embodiment is shown. Figure 5 The structure of another embodiment of the heating device 200 is shown. In some embodiments, the heating device 200 further includes a plurality of second heating tubes 220, which are spaced apart along a direction perpendicular to the extending direction of the ventilation channel 110. Along the extending direction of the ventilation channel 110, the second heating tubes 220 are located on one side of the first heating tube 210 and are spaced apart from the first heating tube 210.

[0035] Because there are gaps between the multiple second heating tubes 220 housed in the heating channel 113, air from the first ventilation end 111 can pass through the gaps between the multiple second heating tubes 220 and flow into the second ventilation end 112. Furthermore, since the multiple second heating tubes 220 are arranged in a direction perpendicular to the extension direction of the ventilation channel 110, and along the extension direction of the ventilation channel 110, the second heating tubes 220 are located on one side of the first heating tube 210, the heating device 200 can further heat the gas distributed in a direction perpendicular to the extension direction of the ventilation channel 110, resulting in higher heating efficiency and further reducing the risk of ice and snow in the airflow entering the ventilation channel 110.

[0036] Based on the scheme with the first heating tube 210 and the second heating tube 220, those skilled in the art can further adjust the posture of the first heating tube 210 and the second heating tube 220.

[0037] As a preferred option, please refer to Figure 2 , Figure 4 As shown, in some embodiments, the first heating tube 210 and the second heating tube 220 are arranged in parallel, and multiple first heating tubes 210 and multiple second heating tubes 220 are staggered along a direction perpendicular to the extending direction of the ventilation channel 110. Through this arrangement, multiple first heating tubes 210 and multiple second heating tubes 220 can cover more space in the ventilation channel 110 perpendicular to its extending direction, making it easier for the heating device 200 to contact the airflow of the ventilation duct 100, thereby improving heating efficiency.

[0038] Specifically, please refer to Figure 2 As shown, in some embodiments, in the extending direction of the ventilation channel 110, the second heating pipe 220 is located closer to the second ventilation end 112 than the first heating pipe 210. After outside air enters the ventilation channel 110 from the first ventilation end 111, some of the air flows directly through the gap between adjacent first heating pipes 210 and is more likely to come into contact with the second heating pipe 220, thereby being heated by the second heating pipe 220. The ice and snow mixed in the airflow are also more likely to be heated by the heating pipe and melt, and are less likely to accumulate in the ventilation channel 110.

[0039] As another preferred option, please refer to Figure 5 As shown, in some embodiments, the extension direction of the second heating tube 220 forms an angle with respect to the extension direction of the first heating tube 210. Through this design, the plurality of first heating tubes 210 and the plurality of second heating tubes 220 can cover more space in the ventilation channel 110 perpendicular to its extension direction, making it easier for the heating device 200 to contact the airflow of the ventilation duct 100, thereby improving heating efficiency.

[0040] Specifically, please refer to Figure 5As shown, in some embodiments, in the extending direction of the ventilation channel 110, the second heating pipe 220 is located closer to the second ventilation end 112 than the first heating pipe 210, and the extending directions of the first heating pipe 210 and the second heating pipe 220 are perpendicular to each other. After the outside air enters the ventilation channel 110 from the first ventilation end 111, some of the air is more likely to come into contact with the second heating pipe 220 after flowing directly through the gap between the adjacent first heating pipes 210, and is thus heated by the second heating pipe 220. The ice and snow mixed in the airflow are also more likely to be heated by the heating pipe and melt, and are less likely to accumulate in the ventilation channel 110.

[0041] Based on the above plan, please refer to Figure 4 , Figure 5 As shown, in some embodiments, the heating device 200 further includes multiple heat-conducting fins 230, with each first heating tube 210 and each second heating tube 220 connected to the multiple heat-conducting fins 230. Heat from the heating tubes can be transferred to the heat-conducting fins 230, and then conducted through the heat-conducting fins 230 to the airflow passing through them, thereby improving the heating efficiency of the heating device 200 and further reducing the possibility of ice and snow accumulating in the ventilation channel 110.

[0042] Please refer to Figure 3 , Figure 4 As shown, in some embodiments, the heating device 200 further includes a plurality of first heat-conducting fins 230A and a plurality of second heat-conducting fins 230B. Each first heating tube 210 is connected to a plurality of first heat-conducting fins 230A, and each second heating tube 220 is connected to a plurality of second heat-conducting fins 230B. Along the extending direction of the first heating tube 210, the plurality of first heat-conducting fins 230A and the plurality of second heat-conducting fins 230B are arranged alternately. With the above scheme, after the outside air enters the ventilation channel 110 from the first ventilation end 111, some of the air is more likely to come into contact with the second heat-conducting fins 230B after flowing directly through the gap between adjacent first heat-conducting fins 230A, and is thus heated by the second heat-conducting fins 230B. The ice and snow mixed in the airflow are also more likely to melt due to the heating of the heat-conducting fins 230A, and are less likely to accumulate in the ventilation channel 110.

[0043] Further, please refer to Figure 4As shown, along the extension direction of the first heating pipe 210, the distance between two adjacent first heat-conducting fins 230A is D1, and the distance between adjacent first heat-conducting fins 230A and second heat-conducting fins 230B is D2, where D1 = 2 * D2. With this design, in the extension direction of the first heating pipe 210, the distance between the second heat-conducting fin 230B and the first heat-conducting fins 230A on both sides is the same. The second heat-conducting fin 230B can contact the colder portion of the air flowing between the adjacent first heat-conducting fins 230A, thereby heating the colder portion of the air and reducing the possibility of ice and snow passing through the heating channel 113. The ventilation channel 110 is also less likely to be blocked by ice and snow accumulation.

[0044] In some embodiments, the spacing of D1 is 2mm to 4mm, specifically 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3.0mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4.0mm, etc.; D2 is half of D1, then the spacing of D1 is 1mm to 2mm, specifically 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm.

[0045] Further, please refer to Figure 1 , Figure 3 As shown, in some embodiments, the ventilation system further includes a first temperature sensor 300, a second temperature sensor 400, and a valve 500. Both the first temperature sensor 300 and the second temperature sensor 400 are disposed in the ventilation channel 110 and are located on opposite sides of the heating device 200 along the extension direction of the ventilation channel 110. The valve 500 is disposed in the ventilation channel 110 and configured to close when the difference between the detected temperature of the first temperature sensor 300 and the detected temperature of the second temperature sensor 400 is less than a first preset value, thereby blocking the first ventilation end 111 and the second ventilation end 112.

[0046] When the heating device 200 is working normally, since the outside air needs to pass through the heating channel 113 during its flow into the internal equipment, the air in the heating channel 113, after being heated, will continue to flow towards the second ventilation end 112, carrying heat to the side of the heating device 200 near the second ventilation end 112. Therefore, the temperature detected by the temperature sensor located on the side of the heating device 200 near the second ventilation end 112 is higher than the temperature detected on the side of the heating device 200 near the first ventilation end 111. If the difference between the detected temperature of the first temperature sensor 300 and the detected temperature of the second temperature sensor 400 is less than a first preset value, it means that the heating capacity of the heating device 200 is insufficient to heat the outside air entering the ventilation channel 110 to a higher temperature. The heating device 200 enters a failure state, and there is a greater risk of ice and snow entering the ventilation channel 110. At this time, the closure of the valve 500 can block the first ventilation end 111 and the second ventilation end 112, thereby preventing the outside air from carrying more ice and snow into the ventilation channel 110 and preventing ice and snow from accumulating in the ventilation channel 110.

[0047] This invention does not limit the first preset value, and those skilled in the art can adjust the first preset value according to the local climate of the nuclear power plant. In some embodiments, the first preset value is 4°C, then the valve 500 closes when the difference between the temperature detected by the first temperature sensor 300 and the temperature detected by the second temperature sensor 400 is less than 4 degrees Celsius, thus blocking the first ventilation end 111 and the second ventilation end 112.

[0048] This invention does not limit the specific location of the valve 500. In some embodiments, the valve 500 is located on the side of the heating device 200 closer to the first ventilation end 111. With the above solution, the valve 500 near the first ventilation end 111 can prevent ice and snow in the outside air from entering the ventilation channel 110.

[0049] As a preferred option, please refer to Figure 1 As shown, valve 500 is located on the side of heating device 200 closer to the second ventilation end 112. With the above solution, valve 500, which is closer to the second ventilation end 112, can prevent some of the ice and snow that has entered the ventilation channel 110 from further entering the internal equipment, thereby better protecting the internal equipment.

[0050] Furthermore, in some embodiments, the ventilation system also includes an alarm device (not shown in the diagram). The alarm device is configured to sound an alarm when the difference between the temperature detected by the first temperature sensor 300 and the temperature detected by the second temperature sensor 400 is less than a second preset value, where the second preset value is greater than a first preset value. During the transition of the heating device 200 from a normal operating state to a failure state, because the second preset value is greater than the first preset value, the alarm device will first issue a warning to the personnel, thereby enabling them to prevent the heating device 200 from failing in advance, thus ensuring the normal ventilation function of the ventilation duct 110 under extreme wind and snow conditions as much as possible.

[0051] Those skilled in the art can further adjust the structure of the ventilation duct 100. In some embodiments, the ventilation duct 100 is a straight pipe, and the ventilation channel 110 extends in a single direction. With the above scheme, external airflow can directly flow from the first ventilation end 111 to the second ventilation end 112 in a single direction. The ventilation duct 100 of the above scheme extends in a single direction, has a relatively simple structure, which is conducive to simplifying production and manufacturing and has high manufacturing efficiency.

[0052] As a preferred option, please refer to Figure 1 , Figure 3 As shown, in some embodiments, the heating device 200 divides the ventilation duct 100 into a first ventilation section 120 and a second ventilation section 130 connected to each other, the first ventilation section 120 having a first ventilation end 111 and the second ventilation section 130 having a second ventilation end 112. The first ventilation section 120 includes a first sidewall 121 and a plurality of second sidewalls 122 connected to each other. The first sidewall 121 and the plurality of second sidewalls 122 together form the first ventilation section 120. Along the extension direction of the ventilation channel 110, one end of the first sidewall 121 is connected to the second ventilation section 130, and the other end is connected to the ground 10. A heating channel 113 is provided on the first sidewall 121. The interior of the first ventilation section 120 is connected to the interior of the second ventilation section 130 through the heating channel 113. The upper ends of the plurality of second sidewalls 122 are connected to the first ventilation section 120. The lower end of at least one second sidewall 122 is spaced from the ground 10 and is lower than the bottom wall of the heating channel 113, so that the first sidewall 121, the plurality of second sidewalls 122 and the ground 10 together define the ventilation opening 20. The interior of the first ventilation section 120 is connected to the outside through the ventilation opening 20.

[0053] Through the above scheme, when external airflow enters the internal equipment from the ventilation channel 110 in the above embodiment, it first enters the interior of the first ventilation section 120 through the vent 20. Since the lower end of at least one second sidewall 122 is lower than the bottom wall of the heating channel 113, the air entering the interior of the first ventilation section 120 from the vent 20 needs to flow upwards further before flowing through the heating channel 113 located on the first sidewall 121 and entering the interior of the second ventilation section 130, and finally entering the internal equipment. During the upward flow of air inside the first ventilation section 120, the ice and snow mixed in the air are less likely to enter the interior of the heating channel 113 due to their own gravity, further reducing the possibility of ice and snow accumulating in the ventilation channel 110. On the other hand, since the ice and snow mixed in the air are less likely to enter the interior of the heating channel 113 due to their own gravity, the power required by the heating device 200 to melt the ice and snow entering the heating channel 113 can also be further reduced.

[0054] Further, please refer to Figure 1 As shown, where Figure 1 The dimension H shown is the distance between the lower end of the second sidewall 122 and the ground 10. In some embodiments, one end of multiple second sidewalls is connected to the second ventilation section, and the distance between the lower end of at least one second sidewall 122 and the ground 10 is greater than or equal to 1000 mm. With the above scheme, the ventilation opening 20 has a larger dimension in the height direction, and it is less likely for outside air to directly block the ventilation opening 20 when it enters the interior of the first ventilation section 120, which is beneficial to improving the ventilation stability of the ventilation channel 110 under long-term operation.

[0055] Please refer to Figure 1 As shown, in some embodiments, the ventilation system further includes a drainage pipe (not shown in the figure), and the bottom wall of the second ventilation section 130 has a drainage hole, through which the interior of the second ventilation section 130 communicates with the interior of the drainage pipe. With this solution, after the ice and snow are melted into water by the heating device 200, it can flow from the drainage hole of the second ventilation section 130 into the interior of the drainage pipe and then flow to other devices, reducing the accumulation of water in the ventilation channel 110. In some embodiments, the ventilation system further includes a storage tank, and the interior of the drainage pipe communicates with the interior of the storage tank. Water entering the drainage pipe from the drainage hole can enter the interior of the storage tank and be collected by the storage tank for subsequent unified processing by staff.

[0056] This invention also proposes a nuclear power plant, which includes a nuclear power plant building and a ventilation system as described in any of the above embodiments. The nuclear power plant building of this invention houses the nuclear power plant units. The second ventilation end 112 of the ventilation system is connected to the interior of the nuclear power plant building. Through the above scheme, external airflow can sequentially enter the interior of the nuclear power plant building through the first ventilation section 120, the heating channel 113, and the second ventilation section 130. Since the heating device 200 has a heating function, ice and snow in the external airflow can be heated and melted after flowing into the heating channel 113, further reducing the possibility of ice and snow blocking the ventilation channel 110, thereby helping to avoid the nuclear power plant units experiencing a shutdown.

[0057] Specifically, the stable operation of a nuclear power plant unit depends on stable temperature and flow conditions inside the plant. Ice and snow blocking the ventilation duct 110 can cause abnormal ventilation volume in the ventilation system, easily leading to abnormal temperature and flow inside the nuclear power plant. Furthermore, since ice and snow blocking the ventilation duct 110 are difficult to clear, prolonged temperature and flow abnormalities can easily cause the nuclear power plant unit to fail. The nuclear power plant of this invention can further reduce the possibility of ice and snow blocking the ventilation duct 110, thereby reducing the possibility of the nuclear power plant unit failing.

[0058] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A ventilation system for ventilating a nuclear power plant, characterized in that, include: A ventilation duct has a ventilation channel, wherein the ventilation channel has a first ventilation end and a second ventilation end in the extending direction of the ventilation channel, the first ventilation end being used to communicate with the outside world, and the second ventilation end being used to communicate with internal equipment. A heating device is provided, wherein the ventilation channel has a heating channel, and the heating device is disposed in the heating channel; the first ventilation end is connected to the second ventilation end through the heating channel, and the heating device is capable of heating the gas located in the heating channel.

2. The ventilation system according to claim 1, characterized in that, The ventilation system also includes a first temperature sensor, a second temperature sensor, and a valve. The first temperature sensor and the second temperature sensor are both disposed in the ventilation channel and are located on both sides of the heating device in the extending direction of the ventilation channel. The valve is located in the ventilation channel and is configured to close when the difference between the temperature detected by the first temperature sensor and the temperature detected by the second temperature sensor is less than a first preset value, so as to block the first ventilation end and the second ventilation end.

3. The ventilation system according to claim 2, characterized in that, The valve is located on the side of the heating device closer to the second ventilation end.

4. The ventilation system according to claim 2, characterized in that, The ventilation system also includes an alarm device, which is configured to issue an alarm when the difference between the temperature detected by the first temperature sensor and the temperature detected by the second temperature sensor is less than a second preset value, wherein the second preset value is greater than the first preset value.

5. The ventilation system according to claim 1, characterized in that, The heating device includes a plurality of first heating tubes; the plurality of first heating tubes are arranged at intervals along a direction perpendicular to the extension direction of the ventilation channel.

6. The ventilation system according to claim 5, characterized in that, The heating device further includes a plurality of second heating tubes; the plurality of second heating tubes are arranged at intervals along a direction perpendicular to the extension direction of the ventilation channel; Along the extending direction of the ventilation channel, the second heating tube is located on one side of the first heating tube and is spaced apart from the first heating tube; the first heating tube and the second heating tube are arranged in parallel, and along a direction perpendicular to the extending direction of the ventilation channel, a plurality of the first heating tubes and a plurality of the second heating tubes are arranged alternately.

7. The ventilation system according to claim 5, characterized in that, The heating device further includes a plurality of second heating tubes; the plurality of second heating tubes are arranged at intervals along a direction perpendicular to the extension direction of the ventilation channel; Along the extension direction of the ventilation channel, the second heating tube is located on one side of the first heating tube and is spaced apart from the first heating tube; the extension direction of the second heating tube has an angle relative to the extension direction of the first heating tube.

8. The ventilation system according to claim 6 or 7, characterized in that, The heating device further includes multiple heat-conducting fins, and each of the first heating tubes and each of the second heating tubes is connected to multiple heat-conducting fins.

9. The ventilation system according to claim 6, characterized in that, The heating device further includes a plurality of first heat-conducting fins and a plurality of second heat-conducting fins, each of the first heating tubes being connected to a plurality of the first heat-conducting fins, and each of the second heating tubes being connected to a plurality of the second heat-conducting fins; Along the extension direction of the first heating tube, a plurality of first heat-conducting fins and a plurality of second heat-conducting fins are arranged alternately.

10. The ventilation system according to claim 9, characterized in that, Along the extension direction of the first heating tube, the distance between two adjacent first heat-conducting fins is D1, and the distance between adjacent first heat-conducting fins and second heat-conducting fins is D2, where D1 = 2 * D2.

11. The ventilation system according to claim 1, characterized in that, The heating device divides the ventilation duct into a first ventilation section and a second ventilation section connected to each other. The first ventilation section has a first ventilation end, and the second ventilation section has a second ventilation end. The first ventilation section includes a first sidewall and a plurality of second sidewalls connected to each other. The first sidewall and the plurality of second sidewalls together form the first ventilation section. Along the extension direction of the ventilation channel, one end of the first sidewall is connected to the second ventilation section, and the other end is connected to the ground. The heating channel is disposed on the first sidewall. The interior of the first ventilation section is connected to the interior of the second ventilation section through the heating channel. The upper ends of the plurality of second sidewalls are connected to the first ventilation section. The lower end of at least one second sidewall is spaced from the ground and is lower than the bottom wall of the heating channel, so that the first sidewall, the plurality of second sidewalls and the ground together define a ventilation opening. The interior of the first ventilation section is connected to the outside through the ventilation opening.

12. The ventilation system according to claim 11, characterized in that, The distance between the lower end of at least one of the second sidewalls and the ground is greater than or equal to 1000 mm.

13. A nuclear power plant, characterized in that, include: The nuclear power plant building houses the nuclear power plant units. The ventilation system as described in any one of claims 1 to 12, wherein the second ventilation end is connected to the interior of the nuclear power plant building.

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