Molten salt reactor loop system and molten salt reactor

Abstract

The invention relates to the field of nuclear reactor engineering design, and discloses a molten salt reactor loop system and a molten salt reactor, the loop system comprises a molten salt heat exchanger and a molten salt pump; the molten salt heat exchanger is provided with a supporting flange; the molten salt pump is provided with a pump tank flange; the molten salt reactor loop system further comprises a coupling flange, and the coupling flange is connected to the lower portion of the supporting flange and the lower portion of the pump tank flange, so that the molten salt pump is located on the peripheral side of the molten salt heat exchanger. According to the molten salt reactor loop system, the molten salt heat exchanger and the molten salt pump are connected into a whole which is arranged left and right through the connecting flange, so that the structure of the molten salt reactor loop system is compact, the molten salt pump is directly arranged on the peripheral side of the molten salt heat exchanger, and the molten salt pump and the molten salt heat exchanger can be communicated through a short pipe; and the complexity of pipeline arrangement of the whole system is reduced.

Description

Technical Field

[0001] The invention relates to the field of nuclear reactor engineering design, and in particular to a molten salt reactor loop system. Background Art

[0002] The molten salt reactor is an advanced type of fourth-generation nuclear reactor, in which the molten salt loop system undertakes the core function of supplying liquid fuel to the reactor and transmitting nuclear fission energy (heat energy). The molten salt reactor loop system consists of molten salt heat exchangers, molten salt pumps and other equipment and pipelines. Molten salt heat exchangers often use fully welded shell-and-tube, U-tube and other heat exchanger structures with high reliability.

[0003] The molten salt pump generally adopts a cantilever centrifugal pump structure and is arranged at the highest position of the loop system. At the same time, in order to adjust the volume change of the molten salt in the loop system and monitor the parameters such as the molten salt level and temperature, the molten salt pump also needs to be equipped with auxiliary devices such as pump tanks. Since the molten salt loop has the characteristics of high operating temperature and large heat exchange temperature difference, in order to avoid high-temperature thermal stress concentration, the molten salt loop needs to use a long pipeline with multiple Π-shaped bends to connect with molten salt pumps, molten salt heat exchangers and other equipment, resulting in a dispersed layout of the high-temperature molten salt loop system, and the structures such as pipelines and their supports, equipment and pipeline heating and insulation increase the complexity of the loop system.

[0004] Small modular reactors have become a hot topic of research in the nuclear energy field at home and abroad due to their high degree of modularity, good inherent safety, and diverse application scenarios. The molten salt circuit structure composed of a conventional all-welded molten salt heat exchanger, a molten salt pump with a molten salt pump tank structure, and a long pipeline system connecting various devices has low compactness and a complex pipeline layout between devices, which cannot meet the development needs of small modular molten salt reactors. In this context, it is necessary to propose a new high-temperature molten salt reactor circuit system structure.

[0005] The heat exchange tubes of the molten salt heat exchanger and the shaft structure of the molten salt pump are vulnerable parts, which need to be regularly inspected or repaired offline during long-term service. The existing fully welded molten salt heat exchangers and molten salt pumps are arranged in a dispersed manner, which is not conducive to the in-service inspection, maintenance and replacement of the heat exchange tubes. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of low structural compactness and complex pipeline layout between devices in the molten salt reactor loop system in the prior art, and to provide a molten salt reactor loop system and a molten salt reactor.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] A molten salt reactor loop system, comprising: a molten salt heat exchanger and a molten salt pump;

[0009] The molten salt heat exchanger has a supporting flange;

[0010] The molten salt pump has a pump tank flange;

[0011] The molten salt reactor loop system further comprises a connecting flange, which is respectively connected to the lower part of the supporting flange and the pump tank flange, so that the molten salt pump is located on the peripheral side of the molten salt heat exchanger.

[0012] In this solution, the molten salt reactor loop system connects the molten salt heat exchanger and the molten salt pump into a whole arranged on the left and right through a connecting flange, so that the structure of the molten salt reactor loop system is compact and the molten salt pump is directly arranged on the peripheral side of the molten salt heat exchanger, so that the molten salt pump can be connected to the molten salt heat exchanger by a short pipe, reducing the complexity of the pipeline layout of the entire system.

[0013] Preferably, the supporting flange and the coupling flange are connected via fasteners;

[0014] The pump tank flange is connected to the coupling flange via a limiting member, which is fixed to the coupling flange and limits the movement of the pump tank flange in the up-down direction and the excessive movement in the radial direction of the molten salt pump.

[0015] In this solution, the molten salt heat exchanger is fixed by a supporting flange and a connecting flange, and the molten salt pump tank and the connecting flange are limited in the up and down directions by a limiting component to prevent the molten salt pump tank from jumping due to instantaneous axial loads such as earthquakes, and elastic limitation is performed in the radial direction of the molten salt pump to only prevent excessive movement, so that the pump tank flange can move horizontally relative to the connecting flange during the thermal expansion process of the molten salt pump tank, thereby avoiding excessive local thermal stress and ensuring the safety of system operation.

[0016] Preferably, a sliding member is provided between the pump tank flange and the coupling flange, so that the pump tank flange and the coupling flange can slide relative to each other.

[0017] In this solution, by arranging a sliding component between the pump tank flange and the connecting flange, the friction force caused by the relative sliding of the pump tank flange and the connecting flange during the thermal expansion of the pump tank of the molten salt pump can be reduced, so that the pump tank flange and the connecting flange can slide relative to each other with extremely small friction force, thereby avoiding equipment jamming or excessive local thermal stress, and ensuring the safety of system operation.

[0018] Preferably, the sliding member is a bull's eye bearing, and a plurality of the bull's eye bearings are circumferentially arranged around the axis of the molten salt pump.

[0019] In this solution, a bull's eye bearing is used as a sliding member, which can facilitate the sliding between the pump tank flange and the connecting flange.

[0020] Preferably, a mounting groove is provided on the upper surface of the connecting flange, and the bull's eye bearing is installed in the mounting groove.

[0021] In this solution, the bull's eye bearing can be conveniently installed in the connecting flange through the installation groove.

[0022] Preferably, the limiting member is a Z-shaped member, and a plurality of the limiting members are arranged on the outer periphery of the pump tank flange along the circumference of the pump tank flange, the limiting member includes an upper connecting portion, an intermediate connecting portion, and a lower connecting portion which are connected in sequence, the lower connecting portion is fixed to the connecting flange, the intermediate connecting portion is located on the outer peripheral side of the pump tank flange and is spaced apart from the outer edge of the pump tank flange, and the upper connecting portion is pressed against the upper surface of the pump tank flange.

[0023] In this solution, a Z-shaped piece is used as a limiting component, which can simply and conveniently achieve the limiting of the pump tank flange in the up and down directions and the elastic limiting in the radial direction.

[0024] Preferably, the molten salt heat exchanger comprises a heat exchange shell and a heat exchange core disposed in the heat exchange shell, the support flange is disposed on the heat exchange shell, and the heat exchange core is connected to the support flange through a core flange;

[0025] The molten salt pump comprises a pump tank and a core pulling assembly arranged in the pump tank, and the core pulling assembly is connected to the pump tank flange through a core pulling flange.

[0026] In this solution, the heat exchange core structure can be pulled out as a whole for offline inspection, maintenance or replacement. The molten salt pump core assembly can be pulled out as a whole for offline inspection, maintenance or replacement.

[0027] Preferably, the molten salt reactor loop system further comprises a reinforcing member, which is respectively fixed to the molten salt heat exchanger and the molten salt pump and is arranged below the connecting flange.

[0028] In this solution, the structure is strengthened by reinforcing components to ensure the structural integrity in a long-term high-temperature operating environment.

[0029] Preferably, the supporting flange is located at the upper end of the molten salt heat exchanger, and the pump tank flange is arranged at the upper end of the molten salt pump.

[0030] Preferably, the high-temperature molten salt inlet of the molten salt heat exchanger is arranged in the middle part of the molten salt heat exchanger, the pump outlet of the molten salt pump is located at the lower end of the molten salt pump and is flush with the high-temperature molten salt inlet of the molten salt heat exchanger, and the pump outlet of the molten salt pump is connected to the high-temperature molten salt inlet of the molten salt heat exchanger.

[0031] In this solution, by aligning the pump outlet of the molten salt pump with the high-temperature molten salt inlet of the molten salt heat exchanger, bending of the connecting pipe between the two can be avoided, the length between the connecting pipes can be shortened to the maximum, the compactness of the system is increased, and the heat loss of the molten salt is reduced.

[0032] A molten salt reactor comprises the molten salt reactor loop system as described above.

[0033] The positive and progressive effect of the present invention is that the molten salt pile loop system connects the molten salt heat exchanger and the molten salt pump into a whole arranged on the left and right through a connecting flange, so that the structure of the molten salt pile loop system is compact and the molten salt pump is directly arranged on the peripheral side of the molten salt heat exchanger, so that the molten salt pump can be connected to the molten salt heat exchanger by using a short pipe, reducing the complexity of the pipeline layout of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the longitudinal cross-section structure of a molten salt reactor loop system according to an embodiment of the present invention.

[0035] Figure 2 Schematic diagram of the longitudinal cross-section structure of a heat exchange core according to an embodiment of the present invention.

[0036] Figure 3 It is a schematic diagram of the longitudinal cross-section structure of a core pulling assembly according to an embodiment of the present invention.

[0037] Figure 4 It is a schematic diagram of the longitudinal cross-section structure of a molten salt reactor loop system according to an embodiment of the present invention, wherein the heat exchange core and the core withdrawal assembly are removed.

[0038] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of part A.

[0039] Figure 6 Schematic diagram of the top view of the molten salt reactor loop system according to one embodiment of the present invention.

[0040] Description of reference numerals: molten salt reactor loop system 700; molten salt heat exchanger 704; heat exchange shell 706; heat exchange core 708; molten salt pump 711; pump tank 713; core pulling assembly 715; molten salt inlet nozzle 11; hydraulic component 110; fastening bolt 111; guide vane cover plate 12; locking nut 13; impeller 14; radial guide vane 15; connecting cylinder 16; pump shaft 17; shielding plug 18; core pulling flange 19; coupling flange 21; bull's eye bearing 22; Z-shaped member 23; upper connecting portion 231; middle connecting portion 232; lower connecting portion 233; pump tank flange 31; pump tank transition section 32; tank body 33; pump body annular cavity 34; pump tank inlet nozzle 35; connecting pipe 36; reinforcing member 37; secondary side inlet pipe 41; secondary side outlet pipe 42; core flange 43; upper water chamber 45; upper water chamber connecting cylinder 44; upper cover plate 46; upper heat exchange tube sheet 47; first bellows 48; lower heat exchange tube sheet 49; lower head 410; second bellows 411; water chamber surrounding cylinder 412; supporting flange 51; cylinder shell 52; lower head 53; primary side molten salt inlet nozzle 54; primary side molten salt outlet nozzle 55; upper throttling baffle ring 56; lower throttling baffle ring 57; heat exchange tube assembly 6. DETAILED DESCRIPTION

[0041] The present invention is further described below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0042] like Figure 1-6 As shown, the molten salt reactor loop system 700 includes: a molten salt heat exchanger 704 and a molten salt pump 711. The molten salt pump 711 pumps high-temperature molten salt into the molten salt heat exchanger 704 to exchange heat with low-temperature molten salt in the molten salt heat exchanger 704.

[0043] The molten salt heat exchanger 704 has a supporting flange 51; the molten salt pump 711 has a pump tank flange 31; wherein the molten salt reactor loop system 700 also includes a connecting flange 21, which is respectively connected to the bottom of the supporting flange 51 and the pump tank flange 31, so that the molten salt pump 711 is located on the peripheral side of the molten salt heat exchanger 704.

[0044] The molten salt reactor loop system 700700 connects the molten salt heat exchanger 704 and the molten salt pump 711 into a whole arranged on the left and right through the connecting flange 21, so that the structure of the molten salt reactor loop system 700 is compact and the molten salt pump 711 is directly arranged on the peripheral side of the molten salt heat exchanger 704, so that the molten salt pump 711 can be connected to the molten salt heat exchanger 704 by using a short pipe, reducing the complexity of the pipeline layout of the entire system.

[0045] The molten salt heat exchanger 704 includes a heat exchange shell 706 and a heat exchange core 708 disposed in the heat exchange shell 706 . The support flange 51 is disposed on the heat exchange shell 706 , and the heat exchange core 708 is connected to the support flange 51 through the core flange 43 .

[0046] The heat exchange shell 706 includes a supporting flange 51, a cylinder shell 52, a lower head 53, a primary molten salt inlet nozzle 54, a primary molten salt outlet nozzle 55, an upper throttling baffle ring 56, and a lower throttling baffle ring 57. After the primary molten salt enters the molten salt heat exchanger 704 from the primary molten salt inlet nozzle 54, due to the action of the upper throttling baffle ring 56 and the lower throttling baffle ring 57, most of the flow, except for a small amount of leakage, directly passes through the annular cavity between the heat exchange core 708 and the shell of the molten salt heat exchanger 704 to enter the primary molten salt inlet at the top of the heat exchange tube assembly 6 to participate in heat exchange.

[0047] The heat exchange core 708 includes a secondary side inlet pipe 41, a secondary side outlet pipe 42, a core flange 43, an upper water chamber 45, an upper water chamber connecting cylinder 44, a heat exchange tube assembly 6, and a lower water chamber. The upper water chamber 45 includes an upper cover plate 46, an upper heat exchange tube sheet 47, and a water chamber surrounding cylinder 412 between the upper cover plate 46 and the upper heat exchange tube sheet 47. The upper cover plate 46 is connected to the secondary side outlet pipe 42. The secondary side inlet pipe 41 successively penetrates the upper cover plate 46 and the upper heat exchange tube sheet 47, and then penetrates the inner sleeve of the heat exchange tube assembly 6 downward, and then directly reaches the lower water chamber. In order to ensure the sealing of the molten salt and match the thermal expansion deviation caused by the temperature difference between the secondary inlet molten salt and the secondary outlet molten salt and the primary inlet molten salt, the secondary inlet pipe 41 passes through the upper cover plate 46 and the upper heat exchange tube sheet 47 with a gap, and the first bellows 48 is used to seal the outside, and the two ends of the first bellows 48 are welded to the upper cover plate 46 and the upper heat exchange tube sheet 47 respectively. The lower water chamber structure includes a lower heat exchange tube sheet 49 and a lower head 410. After the secondary inlet pipe 41 passes through the lower heat exchange tube sheet 49, it goes straight downward to the inside of the lower head 410. In order to ensure the sealing of the molten salt and match the thermal expansion deviation caused by the temperature difference between the secondary inlet molten salt and the primary outlet molten salt, the secondary inlet pipe 41 passes through the lower heat exchange tube sheet 49 with a gap, and the lower end of the second bellows 411 is sealed with the lower heat exchange tube sheet 49.

[0048] The heat exchange core 708 includes a plurality of heat exchange tube assemblies 6. The upper and lower ends of the heat exchange tube assembly 6 are respectively connected to the upper heat exchange tube sheet 47 and the lower heat exchange tube sheet 49. After the secondary molten salt enters the lower end cap 410 through the secondary inlet pipe 41, it passes upward through the lower heat exchange tube sheet 49 and enters the heat exchange tube assembly 6. After heat exchange with the primary molten salt, it passes through the upper heat exchange tube sheet 47 and enters the upper water chamber 45 for convergence, and finally flows upward out of the molten salt heat exchanger 704 through the secondary outlet pipe 42.

[0049] The molten salt pump 711 includes a pump tank 713 and a core pulling assembly 715 disposed in the pump tank 713 . The core pulling assembly 715 is connected to the pump tank flange 31 via a core pulling flange 19 .

[0050] The core pulling assembly 715 includes a hydraulic component 110, a pump shaft 17, a connecting cylinder 16, a shielding plug 18, and a core pulling flange 19. The hydraulic component 110 includes an impeller 14, a radial guide vane 15, and a guide vane cover plate 12, and the lower end of the guide vane cover plate 12 is a molten salt inlet nozzle 11. The impeller 14 is fixed to the pump shaft 17 by a locking nut 13 and driven to rotate by the pump shaft 17. After the primary molten salt is sucked in through the inlet nozzle, it is pressurized by the impeller 14 and expanded by the radial guide vane 15, and enters the pump body annular cavity 34 of the molten salt pump 711. The connecting cylinder 16 is used to transfer and fix the hydraulic component 110 to the bottom of the shielding plug 18 through the fastening bolts 111; the shielding plug 18 is used to isolate the high-temperature molten salt and cover the gas heat to prevent the high temperature from affecting the molten salt pump 711 structure above the shielding plug 18. The core pulling flange 19 is used to fix the core pulling assembly 715 as a whole on the pump tank flange 31.

[0051] The pump tank 713 includes a pump tank flange 31, a pump tank transition section 32, a tank body 33, a pump body annular cavity 34, and a pump tank inlet nozzle 35. The pump tank flange 31 is disposed at the upper end of the tank body 33 and surrounds the tank body 33.

[0052] The supporting flange 51 is connected to the connecting flange 21 by fasteners; the pump tank flange 31 is connected to the connecting flange 21 by a limiting member, which is fixed to the connecting flange 21 and limits the movement of the pump tank flange 31 in the up and down directions and excessive movement in the radial direction of the molten salt pump 711.

[0053] The molten salt heat exchanger 704 is fixed to the connecting flange 21 through the supporting flange 51, and the molten salt tank and the connecting flange 21 are limited in the up and down directions through the limiting components to prevent the molten salt tank from jumping due to the instantaneous axial load such as earthquake on the pump tank 713, and elastic limitation is performed in the radial direction of the molten salt pump 711 to only prevent excessive movement, so that the pump tank flange 31 of the molten salt pump 711 can move relative to the connecting flange 21 during the thermal expansion process of the pump tank 713, thereby avoiding excessive local thermal stress and ensuring the safety of system operation.

[0054] A sliding member is provided between the pump tank flange 31 and the coupling flange 21 , so that the pump tank flange 31 and the coupling flange 21 can slide relative to each other.

[0055] By setting a sliding component between the pump tank flange 31 and the connecting flange 21, the friction caused by the relative sliding of the pump tank flange 31 and the connecting flange 21 during the thermal expansion of the pump tank 713 of the molten salt pump 711 can be reduced, thereby avoiding equipment jamming or excessive local thermal stress and ensuring the safety of system operation.

[0056] In this embodiment, the sliding member is a bull's eye bearing 22, and a plurality of bull's eye bearings 22 are arranged circumferentially around the axis of the molten salt pump 711. The use of the bull's eye bearing 22 as the sliding member can facilitate the sliding between the pump tank flange 31 and the coupling flange 21.

[0057] In other embodiments, the sliding member may also be other existing rolling structures or devices or materials for reducing friction, as long as it can reduce the friction between the pump tank flange 31 and the connecting flange 21 .

[0058] The upper surface of the coupling flange 21 is provided with a mounting groove, and the bull's eye bearing 22 is mounted in the mounting groove. The mounting groove can be used to conveniently mount the bull's eye bearing 22 in the coupling flange 21. In this embodiment, the bull's eye bearing 22 is fixed in the mounting groove by a plurality of hexagon socket tip set screws. The number of the bull's eye bearings 22 is preferably 4-12.

[0059] The limiting member is a Z-shaped member 23, and a plurality of limiting members are arranged on the outer periphery of the pump tank flange 31 along the circumference of the pump tank flange 31. The limiting member includes an upper connecting portion 231, an intermediate connecting portion 232, and a lower connecting portion 233 which are connected in sequence. The lower connecting portion 233 is fixed to the connecting flange 21, the intermediate connecting portion 232 is located on the outer peripheral side of the pump tank flange 31 and is spaced apart from the outer edge of the pump tank flange 31, and the upper connecting portion 231 is pressed against the upper surface of the pump tank flange 31. By using the Z-shaped member 23 as the limiting member, the limiting of the pump tank flange 31 in the up and down directions and the elastic limiting in the radial direction can be simply and conveniently achieved. The Z-shaped member 23 is fixed to the upper surface of the connecting flange 21 by 1-2 hexagon socket tip set screws, and the number of the Z-shaped members 23 is preferably 2-6.

[0060] The pump outlet of the pump tank 713 of the molten salt pump 711 is connected to the primary side molten salt inlet nozzle 54 (high-temperature molten salt inlet) on the heat exchange shell 706 of the molten salt heat exchanger 704 through a connecting pipe 36 .

[0061] Since the heat exchange core 708 is connected to the heat exchange shell 706 through the core flange 43, the heat exchange core 708 structure can be completely removed for offline inspection, maintenance or replacement.

[0062] Since the core pulling assembly 715 is connected to the pump tank 713 via the core pulling flange 19, the core pulling assembly 715 of the molten salt pump 711 can be integrally core pulled and then subjected to offline inspection, maintenance or replacement.

[0063] A bull's eye bearing 22 is provided between the pump tank flange 31 and the coupling flange 21 , so that the pump tank flange 31 and the coupling flange 21 can slide relative to each other.

[0064] The supporting flange 51 is fixedly connected to the connecting flange by fasteners, and the molten salt heat exchanger 704 maintains an axial position during the heating and cooling process of the compact molten salt reactor loop system 700. The outer shell of the molten salt heat exchanger 704 expands in the radial direction of the molten salt heat exchanger 704, and the pump tank 713 expands in its radial direction. There is no rigid constraint between the pump tank flange 31 and the connecting flange, and the reinforcing member 37 between the heat exchanger shell and the pump tank 713 will drive the pump tank 713 and the pump core pulling structure to expand in the radial direction of the heat exchanger as a whole. By arranging a bull's eye bearing 22 between the pump tank flange 31 and the connecting flange 21, the friction caused by the relative slip between the pump tank flange 31 and the connecting flange 21 during the thermal expansion of the pump tank 713 of the molten salt pump 711 can be reduced, avoiding equipment jamming or excessive local thermal stress, and ensuring the safety of system operation. This structure can avoid thermal stress concentration during the heating and cooling process of the molten salt reactor loop system 700. By arranging a limiting member between the pump tank flange 31 and the connecting flange, the pump tank flange 31 can be limited from jumping in the vertical direction (up and down direction), thereby ensuring the safety and stability of the overall structure under loads such as earthquakes.

[0065] The molten salt reactor loop system 700 further includes a reinforcing member 37, which is respectively fixed to the molten salt heat exchanger 704 and the molten salt pump 711 and is disposed below the coupling flange 21. The reinforcing member 37 is used to strengthen the structure and ensure the structural integrity in a long-term high-temperature operation environment.

[0066] In this embodiment, the reinforcing member 37 is a reinforcing rib, which is respectively connected to the heat exchange shell 706 of the molten salt heat exchanger 704 and the pump tank 713 of the molten salt pump 711. The reinforcing rib is rigidly connected to the heat exchange shell 706 of the molten salt heat exchanger 704 and the pump tank 713 of the molten salt pump 711.

[0067] The supporting flange 51 is located at the upper end of the molten salt heat exchanger 704 , and the pump tank flange 31 is provided at the upper end of the molten salt pump 711 .

[0068] The high-temperature molten salt inlet of the molten salt heat exchanger 704 is arranged in the middle part of the molten salt heat exchanger 704, the pump outlet of the molten salt pump 711 is located at the lower end of the molten salt pump 711 and is flush with the high-temperature molten salt inlet (primary side molten salt inlet nozzle 54) of the molten salt heat exchanger 704, and the pump outlet of the molten salt pump 711 is connected to the high-temperature molten salt inlet of the molten salt heat exchanger 704.

[0069] By aligning the pump outlet of the molten salt pump 711 with the high-temperature molten salt inlet of the molten salt heat exchanger 704, bending of the connecting pipe 36 between the two can be avoided, the length of the connecting pipe 36 can be shortened to the maximum, the compactness of the system is increased, and the heat loss of the molten salt is reduced.

[0070] When the molten salt heat exchanger 704 is in operation, the primary molten salt is driven by the molten salt pump 711 to enter the shell side (outside of the heat exchange tube) of the heat exchange tube assembly 6 through the primary molten salt inlet nozzle 54 for heat exchange, and finally converges into the chamber between the lower head 410 of the heat exchange tube assembly 6 and the lower head 53 of the outer shell of the molten salt heat exchanger 704, and flows out from the primary molten salt outlet nozzle 55. After the secondary molten salt enters the interior of the lower head 410 through the secondary inlet pipe 41, it passes upward through the lower heat exchange tube sheet 49 into the interior of the heat exchange tube of the heat exchange tube assembly 6, and after heat exchange with the primary molten salt, it enters the upper water chamber 45 through the upper heat exchange tube sheet 47 and converges, and finally flows upward out of the molten salt heat exchanger 704 through the secondary outlet pipe 42.

[0071] This embodiment also provides a molten salt reactor, which includes the molten salt reactor loop system 700 as described above.

[0072] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship of the device or element in normal use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation at any time, and therefore cannot be understood as a limitation of the present invention in this regard.

[0073] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A molten salt reactor loop system, comprising: Molten salt heat exchangers and molten salt pumps; The molten salt heat exchanger has a supporting flange; The molten salt pump has a pump tank flange; Features: The molten salt reactor loop system further comprises a coupling flange, which is respectively connected to the lower part of the supporting flange and the pump tank flange, so that the molten salt pump is located at the peripheral side of the molten salt heat exchanger.

2. The molten salt reactor circuit system according to claim 1, characterized in that: The supporting flange and the connecting flange are connected via fasteners; The pump tank flange is connected to the coupling flange via a limiting member, which is fixed to the coupling flange and limits the movement of the pump tank flange in the up-down direction and the excessive movement in the radial direction of the molten salt pump.

3. The molten salt reactor circuit system according to claim 2, characterized in that: A sliding member is provided between the pump tank flange and the coupling flange, so that the pump tank flange and the coupling flange can slide relative to each other.

4. The molten salt reactor circuit system according to claim 3, characterized in that: The sliding member is a bull's eye bearing, and a plurality of the bull's eye bearings are circumferentially arranged around the axis of the molten salt pump.

5. The molten salt reactor circuit system according to claim 4, characterized in that: The upper surface of the connecting flange is provided with a mounting groove, and the bull's eye bearing is mounted in the mounting groove.

6. The molten salt reactor circuit system according to claim 3, characterized in that: The limiting member is a Z-shaped member, and a plurality of the limiting members are arranged on the outer periphery of the pump tank flange along the circumference of the pump tank flange. The limiting member includes an upper connecting portion, an intermediate connecting portion, and a lower connecting portion which are connected in sequence. The lower connecting portion is fixed to the connecting flange, the intermediate connecting portion is located on the outer peripheral side of the pump tank flange and is spaced apart from the outer edge of the pump tank flange, and the upper connecting portion is pressed against the upper surface of the pump tank flange.

7. The molten salt reactor circuit system according to claim 1, characterized in that: The molten salt heat exchanger comprises a heat exchange shell and a heat exchange core disposed in the heat exchange shell, the support flange is disposed on the heat exchange shell, and the heat exchange core is connected to the support flange through a core flange; The molten salt pump comprises a pump tank and a core pulling assembly arranged in the pump tank, and the core pulling assembly is connected to the pump tank flange through a core pulling flange.

8. The molten salt reactor circuit system according to claim 1, characterized in that: The molten salt reactor loop system further includes a reinforcing member, which is respectively fixed to the molten salt heat exchanger and the molten salt pump and is arranged below the connecting flange.

9. The molten salt reactor circuit system according to claim 1, characterized in that: The high-temperature molten salt inlet of the molten salt heat exchanger is arranged in the middle of the molten salt heat exchanger, the pump outlet of the molten salt pump is located at the lower end of the molten salt pump and is flush with the high-temperature molten salt inlet of the molten salt heat exchanger, and the pump outlet of the molten salt pump is connected to the high-temperature molten salt inlet of the molten salt heat exchanger.

10. A molten salt reactor, characterized in that: It comprises the molten salt reactor loop system according to any one of claims 1 to 9.

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