Rapid drying equipment and method for secondary side of nuclear power steam generator

Abstract

The invention discloses rapid drying equipment and method for the secondary side of a nuclear power steam generator, the rapid drying equipment for the secondary side of the nuclear power steam generator comprises an air compressor, an air heating device and a gas distributor which are connected in sequence, and the gas distributor is connected with holes in the secondary side of the nuclear power steam generator through a plurality of pipelines; heating gas is input to the secondary side of the nuclear power steam generator; the rapid drying equipment for the secondary side of the nuclear power steam generator further comprises a plurality of dew-point temperature probes and a drying monitoring device connected with the dew-point temperature probes, and the dew-point temperature probes are arranged in holes in the secondary side of the nuclear power steam generator respectively. And the dew point temperature probe is used for feeding back dew point temperature information to the drying monitoring device in real time. According to the rapid drying equipment for the secondary side of the nuclear power steam generator, the secondary side of the nuclear power steam generator can be rapidly dried, the drying condition of the secondary side can be monitored in real time, the drying operation time can be effectively shortened, and the drying efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power technology, and in particular to a secondary side rapid drying device and method for a nuclear power steam generator. Background Art

[0002] Steam generator is one of the important equipment in nuclear power plants and is a key equipment for heat exchange between the primary and secondary circuits. According to regulatory requirements, the steam generator heat transfer tubes need to be tested for helium leaks every ten years of operation or after other indicators appear. To prevent water droplets from clogging potential heat transfer tube leaks, both sides of the steam generator heat transfer tubes need to be dried. The secondary side of the steam generator has a complex internal structure and a large heat exchange area, which is prone to water accumulation and purge dead corners, making it difficult to achieve the required dew point temperature.

[0003] The existing method for drying the secondary side of the evaporator is usually to use the residual heat of the steam generator to accelerate the drying after the primary circuit water pressure test, and to force the secondary side of the steam generator to be purged with compressed air. This time takes at least 72 hours, which accounts for nearly one-third of the entire steam generator heat transfer tube helium leak detection period; if the primary circuit water pressure test is cancelled, the drying time of the secondary side of the evaporator needs to be further extended. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a nuclear power steam generator secondary side rapid drying device and method.

[0005] The technical solution adopted by the present invention to solve the technical problem is: construct a nuclear power steam generator secondary side rapid drying equipment, including an air compressor, an air heating device and a gas distributor connected in sequence, the gas distributor is connected to the nuclear power steam generator secondary side eyelet through a plurality of pipelines to input heating gas to the nuclear power steam generator secondary side;

[0006] The nuclear power steam generator secondary side rapid drying equipment also includes a plurality of dew point temperature probes and a drying monitoring device connected to the dew point temperature probes. The plurality of dew point temperature probes are respectively arranged inside the secondary side eye holes of the nuclear power steam generator. The dew point temperature probes are used to feed back the dew point temperature information to the drying monitoring device in real time.

[0007] In some embodiments, the air heating device comprises a shell, an inner liner is disposed in the shell, a plurality of heating elements are disposed in the inner liner, and an air inlet passage is disposed between the inner wall of the shell and the outer wall of the inner liner;

[0008] An air inlet is provided on the upper side of the shell, an air outlet is provided on the circumferential side of the shell, an air inlet end and an air outlet are respectively provided at two ends of one side of the inner liner, the air inlet end is connected to the air inlet channel, and the air outlet is connected to the air outlet end.

[0009] In some embodiments, a plurality of the heating elements are stacked and spaced apart in the height direction.

[0010] In some embodiments, the vertical spacing between adjacent heating elements is greater than or equal to 0.2 cm and less than or equal to 0.5 cm.

[0011] In some embodiments, the air heating device includes at least one temperature probe, which is arranged close to the air outlet; the air heating device also includes a control device, which is connected to the temperature probe and the heating element.

[0012] In some embodiments, the air heating device includes at least one first pressure sensor and at least one second pressure sensor; the first pressure sensor and the second pressure sensor are both connected to the control device;

[0013] The first pressure sensor is disposed at the air inlet, and the second pressure sensor is disposed at the air outlet.

[0014] In some embodiments, the air heating device includes at least one first gas flow meter and at least one second gas flow meter; the first gas flow meter and the second gas flow meter are both connected to the control device;

[0015] The first gas flow meter is arranged at the gas inlet, and the second gas flow meter is arranged at the gas outlet.

[0016] In some embodiments, the air heating device further comprises a moving wheel disposed at the bottom of the housing.

[0017] In some embodiments, the pipeline comprises a heat shielded pipe.

[0018] The present invention also discloses a nuclear power steam generator secondary side rapid drying method, which is applied to the nuclear power steam generator secondary side rapid drying device of any of the above embodiments, and comprises the following steps:

[0019] The air compressor, the air heating device and the gas distributor are connected in sequence, and the gas distributor is connected to the secondary side eyelet of the nuclear power steam generator through a plurality of pipelines to input heating gas to the secondary side of the nuclear power steam generator;

[0020] The dew point temperature probe real-time monitoring is used to monitor the dew point temperature information of the secondary side of the nuclear power steam generator in real time, and feed back the dew point temperature information to the drying monitoring device in real time.

[0021] The implementation of the present invention has the following beneficial effects: the nuclear power steam generator secondary side rapid drying equipment can rapidly dry the nuclear power steam generator secondary side and monitor its drying condition in real time, and can effectively shorten the drying operation time and improve the drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 is a schematic structural diagram of a nuclear power steam generator secondary side rapid drying device in some embodiments of the present invention;

[0024] Figure 2 is a schematic structural diagram of an air heating device in some embodiments of the present invention;

[0025] Figure 3 It is a partial structural schematic diagram of the air heating device in some embodiments of the present invention. DETAILED DESCRIPTION

[0026] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0027] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0028] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0029] See also Figures 1 to 3 The present invention shows a nuclear power steam generator secondary side rapid drying device, which is used for rapid drying of a nuclear power steam generator 100. The nuclear power steam generator 100 may include an evaporator tube wall 101, and the evaporator tube wall 101 is provided with a plurality of nuclear power steam generator secondary side eye holes 102. A tube sheet 103 is provided inside the evaporator tube wall 101, and a heat transfer tube bundle 104 is provided on the tube sheet 103.

[0030] like Figure 1 As shown, the nuclear power steam generator secondary side rapid drying equipment may include an air compressor 10, an air heating device 20 and a gas distributor 30 connected in sequence, and the gas distributor 30 is connected to the nuclear power steam generator secondary side eyelet 102 through a plurality of pipelines 40 to input heating gas to the nuclear power steam generator secondary side. The pipeline 40 may also be provided with a plurality of control valves, which can control the flow rate and flow velocity of the compressed gas.

[0031] The nuclear power steam generator secondary side rapid drying equipment also includes a plurality of dew point temperature probes 50 and a drying monitoring device 60 connected to the dew point temperature probes 50. The plurality of dew point temperature probes 50 are respectively arranged inside the secondary side eye holes of the nuclear power steam generator. The dew point temperature probes 50 are used to feed back the dew point temperature information to the drying monitoring device 60 in real time.

[0032] Understandably, the nuclear power steam generator secondary side rapid drying equipment can quickly dry the secondary side of the nuclear power steam generator and monitor its drying status in real time, and can effectively shorten the drying operation time and improve the drying efficiency. The nuclear power steam generator secondary side rapid drying equipment can avoid the situation where the primary circuit water pressure test is cancelled and the secondary side drying time of the nuclear power steam generator is extended. The nuclear power steam generator secondary side rapid drying equipment can significantly shorten the secondary side drying time of the nuclear power steam generator, and has corresponding advantages in the absence of a primary circuit water pressure test or other occasions where the evaporator waste heat cannot be used. It can effectively reduce the total time of the overhaul steam generator helium leak detection project and save the critical path. Specifically, the secondary side drying time of a single evaporator heat transfer tube helium leak detection project is expected to be shortened by more than 6 hours. Calculated based on 6 units, at least 36 hours of the critical path can be saved. If the situation of re-drying due to unqualified secondary side drying in historical experience feedback is taken into account, the benefits will be more significant. The nuclear power steam generator secondary side rapid drying equipment shortens the secondary side critical path occupancy time by about 6 hours compared with the existing test process, and the indirect economic benefits of a single round of overhaul are estimated to be about 2.6 million yuan.

[0033] In some embodiments, the air compressor 10 is used to provide clean, oil-free compressed air, which usually requires a gas flow rate of at least 2000 Nm 3 / h, and the outlet of the air compressor 10 needs to be dehydrated and dried so that the dew point temperature of the compressed air at the outlet is lower than -20℃.

[0034] like Figure 2 and Figure 3 As shown, in some embodiments, the air heating device 20 includes an outer shell 21, an inner shell 22 is provided in the outer shell 21, a plurality of heating elements 23 are provided in the inner shell 22, an air intake channel A is provided between the inner wall of the outer shell 21 and the outer wall of the inner shell 22, and compressed air enters the inner shell 22 through the air intake channel A and is heat exchanged by the heating elements 23. Figure 2 a in FIG. 1 is the compressed air flow path.

[0035] The upper side of the shell 21 is provided with an air inlet 211, and the circumferential side of the shell 21 is provided with an air outlet 212. The two ends of one side of the inner liner 22 are respectively provided with an air inlet end 221 and an air outlet end 222. The air inlet end 221 is connected to the air inlet channel A, and the air outlet 212 is connected to the air outlet end 222. The air inlet 211 can be an air inlet flange, and the air outlet 212 can be an air outlet flange. The air inlet flange and the air outlet flange can adopt the same structural design, can be quickly connected with the air inlet pipe and the air outlet pipe through the flange structure, and have good sealing performance. Preferably, the air inlet 211 and the air outlet 212 can also be provided with regulating valves, which can be used to adjust the flow rate and flow rate of the compressed gas.

[0036] Among them, the outer shell 21 and the inner liner 22 form a jacket structure, which constitutes the main body of the air heating device 20. The outer shell 21 adopts an outer metal material, and the inner lining is a multilayer composite material with poor thermal conductivity, good heat resistance, and certain ductility, so that it has good pressure-bearing performance, but is not easy to dissipate heat, so that the overall heat dissipation loss is small, and the risk of burns to operators is reduced. Preferably, the composite material can include but is not limited to asbestos-based composite materials. The inner liner 22 can be made of a metal material with good thermal conductivity, good heat resistance, and non-flammable. It does not need to bear pressure, but can withstand a certain temperature. Preferably, the material of the inner liner 22 includes but is not limited to copper, aluminum, tungsten alloy, and aluminum nitride. The effective flow area inside the jacket structure formed by the outer shell 21 and the inner liner 22 is larger than the cross-sectional area of ​​the air inlet 211 (such as the air inlet flange), so it will not significantly increase the fluid flow resistance.

[0037] like Figure 3 As shown, in some embodiments, a plurality of the heating elements 23 are stacked and arranged at intervals along the height direction, and the heating elements 23 are in a zigzag wave shape or other shapes, and the heating elements 23 include but are not limited to heating wires or heating plates. The angle between the heating element 23 and the air intake direction of the compressed air is less than 90°. Preferably, a plurality of the heating elements 23 may be a "W" type arrangement structure, which can better increase the contact area between the heating element 23 and the flowing air. When the compressed air enters the inner tank 22, it directly contacts the heating element 23, improves the heat exchange efficiency, and reduces the wind resistance. The angle between the compressed air flow direction and the heating element 23 is set to be less than 90°. While increasing the compressed air flow path, it avoids the compressed air from forming a heating dead angle, and improves the compressed air flow and heat exchange efficiency on the surface of the heating element 23.

[0038] like Figure 2 As shown, in some embodiments, the vertical spacing between adjacent heating elements 23 is greater than or equal to 0.2 cm and less than or equal to 0.5 cm. For example, the vertical spacing between adjacent heating elements 23 can be 0.2 cm, 0.3 cm, 0.4 cm, or 0.5 cm.

[0039] like Figure 2 As shown, in some embodiments, the air heating device 20 includes at least one temperature probe 24, which is arranged near the air outlet 212. The temperature probe 24 can be arranged in the inner cavity of the air outlet 212, or the temperature probe 24 is arranged at a position near the air outlet 212 at the air outlet end 222 of the inner liner 22. The air heating device 20 also includes a control device 25, which is connected to the temperature probe 24 and the heating element 23. The temperature probe 24 can also be connected to the drying monitoring device 60, and the control device 25 can be installed on the upper surface of the housing 21. The temperature probe 24 is used to monitor the compressed air temperature in real time, and feed back the temperature signal to the control device 25 and / or the drying monitoring device 60. Of course, the air inlet 211 and the inner liner 22 can also be provided with a temperature probe 24, which is not specifically limited here.

[0040] like Figure 2 As shown, in some embodiments, the air heating device 20 includes at least one first pressure sensor 26 and at least one second pressure sensor 27; the first pressure sensor 26 and the second pressure sensor 27 are both connected to the control device 25; the first pressure sensor 26 is arranged at the air inlet 211, and the second pressure sensor 27 is arranged at the air outlet 212. The first pressure sensor 26 is arranged in the inner cavity of the air inlet 211, and the second pressure sensor 27 is arranged in the inner cavity of the air outlet 212, or the first pressure sensor 26 is arranged at the position of the air inlet channel A near the air inlet 211, and the second pressure sensor 27 is arranged at the position of the air inlet channel A near the air inlet 211. The first pressure sensor 26 and the second pressure sensor 27 are used to monitor the pressure of the air inlet 211 and the air outlet 212 to determine the air path pressure loss of the air heating device 20 for compressed air.

[0041] like Figure 2 As shown, in some embodiments, the air heating device 20 includes at least one first gas flow meter 28 and at least one second gas flow meter 29; the first gas flow meter 28 and the second gas flow meter 29 are both connected to the control device 25; the first gas flow meter 28 is arranged at the air inlet 211, and the second gas flow meter 29 is arranged at the air outlet 212. The first gas flow meter 28 is arranged in the inner cavity of the air inlet 211, and the second gas flow meter 29 is arranged in the inner cavity of the air outlet 212, or the first gas flow meter 28 is arranged at the position of the air inlet channel A near the air inlet 211, and the second gas flow meter 29 is arranged at the position of the air inlet channel A near the air inlet 211. The first gas flow meter 28 and the second gas flow meter 29 are used to monitor the gas flow of the air inlet 211 and the air outlet 212 to determine the gas flow suppression of the compressed air by the air heating device 20.

[0042] The control device 25 can be used to monitor and feedback the pressure, gas flow rate, and temperature changes of the compressed air passing through the air heating device 20 in real time. The air heating device 20 can be temperature controlled by combining fuzzy control theory and PID control. When the temperature of the air outlet 212 of the air heating device 20 reaches the set value, the control device 25 can automatically adjust the output power of the heating element 23 according to the feedback signal of the temperature probe 24 after PID calculation, and realize temperature control of the resistive load of the heating element 23, so that the gas temperature of the air outlet 212 is uniform and meets the drying process requirements. The combination of fuzzy control and PID control has fast response and setting function, and can be switched manually or automatically as required. Preferably, the control device 25 includes but is not limited to a PLC industrial computer.

[0043] In some embodiments, the control device 25 can set the expected heating target of the air heating device 20, start the air compressor 10 and determine that the gas path is unobstructed. The expected heating target can be, for example, 35°C to 40°C, preferably 40°C. The control device 25 realizes the interlocking control of the compressed air and the heating element 23. The heating element 23 can only be started when there is a compressed air gas flow. When the gas flow cannot be detected, the heating element 23 stops synchronously. The control device 25 is based on the temperature range set by the personnel (such as 35°C to 40°C). When the feedback signal of the temperature probe 24 located at the air outlet 212 is lower than the lower temperature threshold, the heating element 23 starts working. When the feedback signal of the temperature probe 24 is higher than the upper temperature threshold, the heating element 23 stops working.

[0044] like Figure 2 As shown, in some embodiments, the air heating device 20 further includes a moving wheel 213 disposed at the bottom of the housing 21. The moving wheel 213 is used to move the transport box of the air heating device 20. The moving wheel 213 includes but is not limited to a heavy-load universal wheel.

[0045] For example Figure 1 As shown, the gas distributor 30 is located near the secondary side eyelet 102 of the steam generator, and is used to divide the compressed air heated by the air heating device 20 into multiple transmission paths. The gas distributor 30 is connected to the secondary side eyelet 102 of the nuclear power steam generator through a plurality of pipelines 40 to input heating gas to the secondary side of the nuclear power steam generator. The pipeline 40 includes a heat shielding pipe, which can be a heat shielding gas pipe made of PVC material with an outer layer covered with a metal bellows. The heat shielding pipe is used to connect the gas distributor 30 and the secondary side eyelet 102 of the steam generator. It has a certain heat insulation performance, reduces the heat loss on the high-temperature gas transmission path, and can reduce the risk of scalding.

[0046] In some embodiments, the steam generator secondary side eyelet 102 is located above the tube sheet 103 and evenly distributed around the evaporator tube wall 101, serving as the inlet for compressed air to be charged into the secondary side of the nuclear power steam generator. At least one set of dew point temperature probes 50 can be arranged inside the tube sheet 103. The tube sheet 103 is located inside the evaporator tube wall 101, and a large number of heat transfer tube bundles 104 are distributed thereon according to a specific arrangement rule. Usually, there is a considerable amount of residual water above the tube sheet 103 due to structural shielding or insufficient drainage. The heat transfer tube bundle 104 is the main inspection object for helium leak detection of the evaporator heat transfer tube. It is arranged in a specific pattern in the evaporator tube wall 101. The gaps between the heat transfer tube bundles 104 are narrow, and compressed air is not easy to purge, and there is a tendency to have a purge dead angle. The evaporator tube wall 101 is a container cylinder wall that contains the tube sheet 103, the heat transfer tube bundle 104 and other components, and is distributed with a certain number of eyelets, hand holes, and manholes.

[0047] In some embodiments, the dew point temperature probe 50 is located at the secondary side eye hole 102 of the steam generator, and the dew point temperature probe 50 may also be provided inside the secondary side manhole of the steam generator. The dew point temperature probe 50 feeds back the dew point temperature information to the drying monitoring device 60 in real time. The drying monitoring device 60 is used to monitor the internal drying condition of the secondary side of the nuclear power steam generator. The drying monitoring device 60 may include but is not limited to a PLC industrial computer. In some embodiments, the drying monitoring device 60 and the control device 25 may be the same PLC industrial computer. Of course, the drying monitoring device 60 and the control device 25 may also be independent PLC industrial computers.

[0048] In addition, an ambient temperature probe may be provided in the secondary side eye hole 102 of the steam generator, and the ambient temperature probe is connected to the drying monitoring device 60. The drying monitoring device 60 monitors and determines the drying condition of the secondary side of the nuclear power steam generator according to the collected feedback signal.

[0049] It can be understood that the nuclear power steam generator secondary side rapid drying equipment can achieve rapid drying of the nuclear power steam generator secondary side and reliably grasp its drying condition by accurately heating the compressed air, maintaining the gas flow rate, and real-time monitoring the drying condition of the nuclear power steam generator secondary side.

[0050] Rapidly dry the secondary side of the nuclear power steam generator and monitor its drying status in real time, which can effectively shorten the drying operation time and improve the drying efficiency.

[0051] In some embodiments, the present invention further discloses a nuclear power steam generator secondary side rapid drying method, which is applied to the nuclear power steam generator secondary side rapid drying device of any of the above embodiments. The nuclear power steam generator secondary side rapid drying method comprises the following steps:

[0052] The air compressor 10, the air heating device 20 and the gas distributor 30 are connected in sequence, and the gas distributor 30 is connected to the secondary side eyelet 102 of the nuclear power steam generator through a plurality of pipelines 40 to input heating gas to the secondary side of the nuclear power steam generator.

[0053] The dew point temperature probe 50 is used for real-time monitoring of the dew point temperature information of the secondary side of the nuclear power steam generator, and feeds back the dew point temperature information to the drying monitoring device 60 in real time.

[0054] In this embodiment, the following steps are also included:

[0055] The temperature probe 24 , the first pressure sensor 26 , the second pressure sensor 27 , the first gas flow meter 28 and the second gas flow meter 29 are arranged in place and the air heating device 20 is started.

[0056] The control device 25 sets the expected heating target of the air heating device 20, starts the air compressor 10 and determines that the air path is unobstructed. The expected heating target can be, for example, 35°C to 40°C, preferably 40°C.

[0057] The control device 25 performs interlocking control of the compressed air and the heating element 23. When the first gas flow meter 28 and / or the second gas flow meter 29 detects the compressed air gas flow, the heating element 23 starts. When the first gas flow meter 28 and / or the second gas flow meter 29 fails to detect the compressed air gas flow, the heating element 23 stops synchronously.

[0058] The control device 25 is based on the temperature range set by the personnel (such as 35°C to 40°C). When the feedback signal of the temperature probe 24 located at the air outlet 212 is lower than the lower temperature threshold (such as 35°C), the heating element 23 starts working. When the feedback signal of the temperature probe 24 is higher than the upper temperature threshold (such as 40°C), the heating element 23 stops working.

[0059] The control device 25 can be used to monitor and feedback the pressure, gas flow rate, and temperature changes of the compressed air passing through the air heating device 20 in real time. The air heating device 20 can be temperature controlled by combining fuzzy control theory and PID control. When the temperature of the air outlet 212 of the air heating device 20 reaches the set value, the control device 25 can automatically adjust the output power of the heating element 23 according to the feedback signal of the temperature probe 24 after PID calculation, and realize temperature control of the resistive load of the heating element 23, so that the gas temperature of the air outlet 212 is uniform and meets the drying process requirements. The combination of fuzzy control and PID control has fast response and setting function, and can be switched manually or automatically as required. Preferably, the control device 25 includes but is not limited to a PLC industrial computer.

[0060] The staff can monitor the internal drying condition of the secondary side of the nuclear power steam generator in real time according to the drying monitoring device 60, and can estimate the remaining drying time according to the dew point temperature change curve. Further, the staff can monitor the internal drying condition of the secondary side of the nuclear power steam generator in real time according to the drying monitoring device 60, and can estimate the remaining drying time according to the temperature and dew point temperature change curve.

[0061] The nuclear power steam generator secondary side rapid drying equipment and method can significantly shorten the secondary side drying time of the nuclear power steam generator, and has corresponding advantages in situations where there is no primary water pressure test or other situations where the evaporator waste heat cannot be used. It can effectively reduce the total time of the overhaul steam generator helium leak detection project and save the critical path. Specifically, the secondary side drying time of a single evaporator heat transfer tube helium leak detection project is expected to be shortened by more than 6 hours. Calculated based on 6 units, at least 36 hours of critical path can be saved. If the historical experience feedback is taken into account and the situation of re-drying due to unqualified secondary side drying, the benefits will be more significant. Compared with the existing test process, the nuclear power steam generator secondary side rapid drying equipment and method shortens the secondary side critical path occupancy time by about 6 hours, and the indirect economic benefits of a single round of overhaul are expected to be about 2.6 million yuan.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0063] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A nuclear power steam generator secondary side rapid drying equipment, characterized in that: It comprises an air compressor (10), an air heating device (20) and a gas distributor (30) which are connected in sequence, wherein the gas distributor (30) is connected to the secondary side eyelet of a nuclear power steam generator through a plurality of pipelines (40) so as to input heating gas to the secondary side of the nuclear power steam generator; The nuclear power steam generator secondary side rapid drying equipment further comprises a plurality of dew point temperature probes (50) and a drying monitoring device (60) connected to the dew point temperature probes (50), wherein the plurality of dew point temperature probes (50) are respectively arranged inside the secondary side eye holes of the nuclear power steam generator, and the dew point temperature probes (50) are used to feed back dew point temperature information to the drying monitoring device (60) in real time.

2. The nuclear power steam generator secondary side rapid drying equipment according to claim 1, characterized in that: The air heating device (20) comprises an outer shell (21), an inner shell (22) is provided in the outer shell (21), a plurality of heating elements (23) are provided in the inner shell (22), and an air inlet channel (A) is provided between the inner wall of the outer shell (21) and the outer wall of the inner shell (22); An air inlet (211) is provided on the upper side of the outer shell (21), an air outlet (212) is provided on the circumferential side of the outer shell (21), and an air inlet end (221) and an air outlet end (222) are respectively provided at two ends of one side of the inner liner (22), the air inlet end (221) is connected to the air inlet channel (A), and the air outlet (212) is connected to the air outlet end (222).

3. The nuclear power steam generator secondary side rapid drying equipment according to claim 2, characterized in that: A plurality of the heating elements (23) are stacked and arranged at intervals along the height direction.

4. The nuclear power steam generator secondary side rapid drying equipment according to claim 3, characterized in that: The vertical spacing between adjacent heating elements (23) is greater than or equal to 0.2 cm and less than or equal to 0.5 cm.

5. The nuclear power steam generator secondary side rapid drying equipment according to claim 3, characterized in that: The air heating device (20) comprises at least one temperature probe (24), wherein the temperature probe (24) is arranged close to the air outlet (212); the air heating device (20) further comprises a control device (25), wherein the control device (25) is connected to the temperature probe (24) and the heating element (23).

6. The nuclear power steam generator secondary side rapid drying equipment according to claim 5, characterized in that: The air heating device (20) comprises at least one first pressure sensor (26) and at least one second pressure sensor (27); the first pressure sensor (26) and the second pressure sensor (27) are both connected to the control device (25); The first pressure sensor (26) is arranged at the air inlet (211), and the second pressure sensor (27) is arranged at the air outlet (212).

7. The nuclear power steam generator secondary side rapid drying equipment according to claim 5, characterized in that: The air heating device (20) comprises at least one first gas flow meter (28) and at least one second gas flow meter (29); the first gas flow meter (28) and the second gas flow meter (29) are both connected to the control device (25); The first gas flow meter (28) is arranged at the gas inlet (211), and the second gas flow meter (29) is arranged at the gas outlet (212).

8. The nuclear power steam generator secondary side rapid drying equipment according to claim 5, characterized in that: The air heating device (20) further comprises a moving wheel (213) arranged at the bottom of the housing (21).

9. The nuclear power steam generator secondary side rapid drying equipment according to claim 1, characterized in that: The pipeline (40) comprises a heat shielded pipe.

10. A nuclear power steam generator secondary side rapid drying method, applied to the nuclear power steam generator secondary side rapid drying equipment according to any one of claims 1 to 9, characterized in that: The following steps are involved: The air compressor (10), the air heating device (20) and the gas distributor (30) are connected in sequence, and the gas distributor (30) is connected to the secondary side eyelet of the nuclear power steam generator through a plurality of pipelines (40) so as to input heating gas to the secondary side of the nuclear power steam generator; The dew point temperature probe (50) is used for real-time monitoring of the dew point temperature information on the secondary side of the nuclear power steam generator, and feeds back the dew point temperature information to the drying monitoring device (60) in real time.

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