Core pulling structure and in-service inspection method of core pulling structure

Abstract

The present invention discloses a core-pulling structure and an in-service inspection method for the core-pulling structure. The core-pulling structure is applied to a heat exchanger, wherein the circumference of the heat exchanger has an inspection space. The core-pulling structure includes a heat exchanger core-pulling assembly, and the heat exchanger core-pulling assembly includes a connecting assembly. Along the direction of the inspection space, the heat exchanger core-pulling assembly and the outer shell of the heat exchanger are detachably connected via the connecting assembly. The core-pulling structure also includes a supporting assembly, which is used to support the connecting assembly, and the connecting assembly is detachably connected to the supporting assembly. By arranging the heat exchanger core-pulling assembly and the heat exchanger in a detachable connection, in-service inspection, maintenance, and replacement of heat exchange tubes can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of molten salt driven heat exchange, and in particular to a core pulling structure and an in-service inspection method for the core pulling structure. Background Art

[0002] The heat exchange tubes and molten salt pump shafting of a molten salt heat exchanger are vulnerable parts and require regular in-service inspections during long-term service. The existing integrated structure of the molten salt reactor heat exchanger and molten salt pump does not allow for in-service inspection, repair, or replacement of the heat exchange tubes. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the heat exchanger cannot be inspected in service and is inconvenient to maintain, and to provide a core pulling structure and a method for inspecting the core pulling structure in service.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] A core pulling structure is applied to a heat exchanger, wherein the surrounding side of the heat exchanger has an inspection space, the core pulling structure includes a heat exchanger core pulling assembly, and the heat exchanger core pulling assembly includes a connecting assembly. Along the direction of the inspection space, the heat exchanger core pulling assembly and the outer shell of the heat exchanger are detachably connected through the connecting assembly. The core pulling structure also includes a supporting assembly, which is used to support the connecting assembly, and the connecting assembly is detachably connected to the supporting assembly.

[0006] In this solution, an inspection space is formed around the heat exchanger and the heat exchanger core pull assembly is detachably connected to the heat exchanger shell, so that the heat exchanger core pull assembly has a detachable base, thereby enabling in-service inspection, maintenance and replacement of the heat exchanger core pull assembly. In addition, the connection assembly and the support assembly are detachably connected, so that the heat exchanger core pull assembly and the heat exchanger shell can be quickly separated through the connection assembly during in-service inspection of the heat exchanger core pull assembly. At the same time, an additional support assembly is provided to support the heat exchanger core pull assembly, ensuring the reliability and stability of the heat exchanger when it has the in-service inspection function, which is suitable for high-efficiency molten salt heat exchange application scenarios.

[0007] Preferably, the connecting assembly includes a first supporting flange, the heat exchanger core pulling assembly can be inserted into the outer shell of the heat exchanger, the first supporting flange is arranged on the outer peripheral side of the heat exchanger core pulling assembly, and when the heat exchanger core pulling assembly is inserted into the outer shell of the heat exchanger, the first supporting flange overlaps the outer shell of the heat exchanger.

[0008] In this solution, through the above arrangement, the heat exchanger core pulling assembly is effectively fixed when the heat exchanger core pulling assembly is detachably connected to the heat exchanger.

[0009] Preferably, the connecting assembly also includes a second supporting flange, which is arranged on the outer peripheral side of the outer shell of the heat exchanger and corresponds to the first supporting flange. When the heat exchanger core pulling assembly is inserted into the outer shell of the heat exchanger, the first supporting flange overlaps the second supporting flange.

[0010] In this solution, through the above arrangement, when the heat exchanger core extraction assembly is detachably connected to the heat exchanger, the first supporting flange is effectively supported by the second supporting flange.

[0011] Preferably, the support assembly includes a third support flange, and a receiving hole is provided on the third support flange. The receiving hole is used to receive the outer shell of the heat exchanger. When the outer shell of the heat exchanger is inserted into the receiving hole, the second support flange overlaps the third support flange.

[0012] In this solution, the aforementioned arrangement effectively supports the heat exchanger core assembly and the heat exchanger housing after they are connected, enabling in-service inspection, repair, and replacement of heat exchange tubes. Furthermore, the support assembly provides a more compact structure, meeting the development needs of small modular molten salt reactors and improving the overall compactness and integration of the equipment circuit.

[0013] Preferably, the connecting assembly also includes a fourth supporting flange, and the heat exchanger core pulling assembly includes a first core and a second core, wherein the first supporting flange is arranged on the outer peripheral side of the first core, and the fourth supporting flange is arranged on the outer peripheral side of the second core. The first core can be inserted into the second core. When the first core and the second core are plugged in, the first core is located above the second core, and the first supporting flange overlaps the fourth supporting flange. When the first core and the second core are sequentially plugged into the outer shell of the heat exchanger, along the direction of the maintenance space, the first supporting flange and the fourth supporting flange are sequentially overlapped on the second supporting flange.

[0014] In this solution, the aforementioned arrangement enables the heat exchanger core pull assembly to achieve a detachable connection between the first and second cores. The first core can be removed for in-service inspection of the second core, and the second core can be repaired or replaced without requiring the entire heat exchanger core pull assembly to be replaced, saving maintenance costs. Along the inspection space, the second support flange effectively supports the first and fourth support flanges, ensuring the relative position of the first and second cores.

[0015] Preferably, the core pulling structure further includes a monitoring mechanism, the monitoring mechanism having a first air path and a second air path, both of which are provided with air pressure monitoring equipment, wherein the first air path is used to supply air to a first sealing ring cavity between the first core body and the second core body, and when the air pressure of the first air path reaches a preset value, the first sealing ring cavity is sealed;

[0016] The second air path is used to supply air to a second sealing ring cavity between the second core and the shell of the heat exchanger. When the air pressure of the second air path reaches a preset value, the second sealing ring cavity is sealed.

[0017] In this solution, through the above-mentioned settings, the gas pressure in the first sealing ring cavity and the second sealing ring cavity can be monitored in real time, and the fluid level in the heat exchanger can be guaranteed to be within a reasonable safety range, thereby avoiding the liquid level rising to the overlap of the first support flange and the fourth support flange, as well as the overlap of the fourth support flange and the second support flange after long-term micro-leakage of gas, thereby ensuring the reliability and safety of the sealing structure.

[0018] Preferably, the core-pulling structure further includes an emptying pipe, which is disposed inside the first core and extends into the second core.

[0019] In this solution, the above arrangement overcomes the defect that the fluid in the lower half of the heat exchanger core extraction assembly is difficult to drain, so that the fluid in the second core can be drained, providing a basis for in-service inspection.

[0020] A method for in-service inspection of a core-pulling structure is provided. The method is implemented by using the core-pulling structure as described above. The method comprises the following steps:

[0021] S10, draining the molten salt from the first core of the heat exchanger;

[0022] S20, draining the molten salt in the second core of the heat exchanger;

[0023] S30: Remove the first core from the heat exchanger and inspect the second core.

[0024] In this solution, the fluid in the first and second cores, i.e., the molten salt, is drained and the first core is removed, so that maintenance personnel can perform in-service inspections on the second core, thereby increasing the service life of the heat exchanger and overcoming the problem of being unable to perform in-service inspections.

[0025] Preferably, step S10 further includes the following steps:

[0026] An inlet pipe connected to a gas source is extended into the first core, and an outlet pipe connected to a storage tank is also extended into the first core, the gas source and the storage tank are connected, and the molten salt in the first core is emptied.

[0027] In this solution, the above arrangement is used to effectively drain the molten salt in the first core, thereby facilitating the removal of the first core and further facilitating the in-service inspection of the second core.

[0028] Preferably, step S20 further includes the following steps:

[0029] The exhaust pipe is extended into the second core, the outlet pipe is closed, the exhaust pipe connected to the storage tank is connected, and the gas source is connected at the same time to exhaust the molten salt in the second core.

[0030] In this solution, the above arrangement is used to effectively drain the molten salt in the second core, thereby achieving in-service inspection of the second core.

[0031] Preferably, step S30 further includes the following steps:

[0032] After the in-service inspection of the second core, if repair or replacement is required, the second core can be removed from the shell of the heat exchanger through the fourth supporting flange.

[0033] In this solution, through the above arrangement, when removing the second core, the fourth support flange can be directly removed and lifted up along the direction of the inspection space to remove the second core from the shell of the heat exchanger.

[0034] The positive progress of the present invention is that: by forming an inspection space on the peripheral side of the heat exchanger and arranging the heat exchanger core pull assembly and the heat exchanger to be detachably connected, the heat exchanger core pull assembly has a detachable base, thereby enabling in-service inspection, maintenance and replacement of the heat exchanger core pull assembly; in addition, the connection assembly and the support assembly are arranged to be detachably connected, so that when the heat exchanger core pull assembly is inspected in service, the heat exchanger core pull assembly and the heat exchanger shell can be quickly separated through the connection assembly. At the same time, an additional support assembly is provided to support the heat exchanger core pull assembly, ensuring the reliability and stability of the heat exchanger when it has the in-service inspection function, and is suitable for high-efficiency molten salt heat exchange application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic structural diagram of a heat exchanger according to an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the shell structure of a heat exchanger according to an embodiment of the present invention;

[0037] Figure 3This is a schematic diagram of the plugging of the first core and the second core according to an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the connection between the second core and the shell of the heat exchanger according to an embodiment of the present invention;

[0039] Figure 5 This is a schematic structural diagram of a first core according to an embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of emptying the first core and the second core according to an embodiment of the present invention;

[0041] Figure 7 The figure is a flow chart of an in-service inspection method of a core pulling structure according to an embodiment of the present invention.

[0042] Description of reference numerals:

[0043] Heat exchanger 100 housing 101 heat exchanger core pulling assembly 10 first core body 11 second core body 12 first sealing ring cavity 111 second sealing ring cavity 112 connection assembly 20 first support flange 21 second support flange 22 fourth support flange 24 maintenance space 200 support assembly 30 third support flange 31 receiving hole 32 monitoring mechanism 40 first gas path 41 second gas path 42 air pressure monitoring device 43 gas source 50 inlet pipe 51 first valve body 52 buffer tank 53 drain pipe 60 storage tank 70 outlet pipe 71 second valve body 72 DETAILED DESCRIPTION

[0044] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0045] This embodiment provides a core pulling structure, the specific structure is as follows Figure 1 、 Figure 2 and Figure 3 As shown, the core pulling structure is applied to the heat exchanger 100, and the peripheral side of the heat exchanger 100 has an inspection space 200. The core pulling structure includes a heat exchanger core pulling assembly 10, and the heat exchanger core pulling assembly 10 includes a connecting assembly 20. Along the direction of the inspection space 200, the heat exchanger core pulling assembly 10 and the outer shell 101 of the heat exchanger 100 are detachably connected through the connecting assembly 20. The core pulling structure also includes a supporting assembly 30, which is used to support the connecting assembly 20, and the connecting assembly 20 and the support assembly 30 are detachably connected.

[0046] Specifically, an inspection space 200 is provided on the peripheral side of the heat exchanger 100. The inspection space 200 can be an area above the heat exchanger 100 or an area inclined in the height direction of the heat exchanger 100. On this basis, the space above the heat exchanger 100 is released, so that the heat exchanger core extraction assembly 10 and the heat exchanger 100 have a basis for disassembly and maintenance, thereby realizing the in-service inspection, maintenance and replacement of the heat exchanger 100.

[0047] The heat exchanger core pull assembly 10 is plugged into the outer shell 101 of the heat exchanger 100 to achieve a detachable connection with the heat exchanger 100. During plugging, the heat exchanger core pull assembly 10 abuts against the outer shell 101 via the connecting assembly 20, thereby limiting the position of the heat exchanger core pull assembly 10 when plugged into the outer shell 101 and ensuring the position of the heat exchanger core pull assembly 10 within the outer shell 101. In this embodiment, an additional support assembly 30 is provided, and the connecting assembly 20 is overlapped on the support assembly 30, so that the heat exchanger core pull assembly 10 and the outer shell 101 of the heat exchanger 100 can be quickly separated through the connecting assembly 20 during in-service inspection of the heat exchanger core pull assembly 10. At the same time, when the heat exchanger core pulling assembly 10 is detachably connected to the shell 101, the support assembly 30 has the ability to independently support the connection assembly 20, so that the heat exchanger core pulling assembly 10 can be disassembled without affecting the shell 101, preventing the shell 101 from having to be disassembled during disassembly and affecting the reliability of the heat exchanger 100 in the system, which is suitable for high-efficiency molten salt heat exchange application scenarios.

[0048] In this embodiment, the connecting assembly 20 includes a first supporting flange 21. The heat exchanger core pulling assembly 10 can be inserted into the outer shell 101 of the heat exchanger 100. The first supporting flange 21 is arranged on the outer peripheral side of the heat exchanger core pulling assembly 10. When the heat exchanger core pulling assembly 10 is inserted into the outer shell 101 of the heat exchanger 100, the first supporting flange 21 overlaps the outer shell 101 of the heat exchanger 100.

[0049] Specifically, the housing 101 of the heat exchanger 100 is cylindrical and has an opening. The opening is arranged in a direction corresponding to the maintenance space 200. One end of the heat exchanger core pull assembly 10 is inserted into the housing 101 through the opening, while the other end of the heat exchanger core pull assembly 10 is located outside the housing 101. The outer periphery of the heat exchanger core pull assembly 10 is provided with a first support flange 21. The first support flange 21 can be an annular flange, or other flange shapes provided on opposite sides as is conventionally known, such as rectangular flanges. The first support flange 21 is larger than the opening, so that the heat exchanger core pull assembly 10 overlaps the housing 101 when inserted, thereby effectively securing the heat exchanger core pull assembly 10. It is understood that during an in-service inspection of the heat exchanger 100, an operator can separate the housing 101 from the heat exchanger core pull assembly 10 by grasping or clamping the first support flange 21, without having to touch the housing 101 to ensure its position within the system, thereby ensuring the reliability of the in-service inspection.

[0050] In this embodiment, the connecting assembly 20 also includes a second support flange 22, which is arranged on the outer peripheral side of the outer shell 101 of the heat exchanger 100 and corresponds to the first support flange 21. When the heat exchanger core pulling assembly 10 is inserted into the outer shell 101 of the heat exchanger 100, the first support flange 21 overlaps the second support flange 22.

[0051] Specifically, the shell 101 also has a second support flange 22, which can be an annular flange, or flanges of other shapes set on opposite sides in the prior art, such as a rectangular flange. In this embodiment, the second support flange 22 and the first support flange 21 can be the same size. In other embodiments, the size of the second support flange 22 can be larger or smaller than the size of the first support flange 21. When the heat exchanger core pull assembly 10 is plugged into the shell 101, the first support flange 21 of the heat exchanger core pull assembly 10 overlaps the second support flange 22 of the shell 101 to effectively support the first support flange 21 through the second support flange 22.

[0052] In this embodiment, the support assembly 30 includes a third support flange 31, and a receiving hole 32 is opened on the third support flange 31. The receiving hole 32 is used to accommodate the outer shell 101 of the heat exchanger 100. When the outer shell 101 of the heat exchanger 100 is inserted into the receiving hole 32, the second support flange 22 overlaps the third support flange 31.

[0053] Specifically, the third support flange 31 is provided with a receiving hole 32 for receiving the outer shell 101. The receiving hole 32 is smaller than the second support flange 22, so that when the outer shell 101 is inserted into the receiving hole 32, the third support flange 31 supports the second support flange 22. Furthermore, after the heat exchanger core pull assembly 10 is inserted into the outer shell 101, the second support flange 22 also supports the first support flange 21. That is, the heat exchanger core pull assembly 10 and the heat exchanger 100 are detachably connected, and when the outer shell 101 is inserted into the receiving hole 32, the third support flange 31 effectively supports the heat exchanger core pull assembly 10 and the outer shell 101, enabling in-service inspection, maintenance, and replacement of the heat exchanger 100.

[0054] In addition, the support assembly 30 provides support for the heat exchanger 100, making the heat exchanger 100 more compact, meeting the development requirements of small modular molten salt reactors and improving the overall compactness and integration level of the equipment circuit.

[0055] In a preferred embodiment, the connecting assembly 20 also includes a fourth support flange 24, and the heat exchanger core pulling assembly 10 includes a first core body 11 and a second core body 12, wherein the first support flange 21 is arranged on the outer peripheral side of the first core body 11, and the fourth support flange 24 is arranged on the outer peripheral side of the second core body 12. The first core body 11 can be inserted into the second core body 12. When the first core body 11 and the second core body 12 are plugged in, the first core body 11 is located above the second core body 12, and the first support flange 21 overlaps the fourth support flange 24. When the first core body 11 and the second core body 12 are sequentially plugged into the outer shell 101 of the heat exchanger 100, along the direction of the maintenance space 200, the first support flange 21 and the fourth support flange 24 are sequentially overlapped on the second support flange 22.

[0056] Specifically, the heat exchanger core pull assembly 10 is a split structure, wherein the first core 11 is the upper half of the heat exchanger core pull assembly 10, and the second core 12 is the lower half of the heat exchanger core pull assembly 10, and the two are connected after being plugged in. The first support flange 21 is provided on the outer peripheral side of the first core 11, and the fourth support flange 24 is provided on the outer peripheral side of the second core 12. When the first core 11 and the second core 12 are plugged in and combined to form the heat exchanger core pull assembly 10, the first support flange 21 overlaps the fourth support flange 24 along the direction of the maintenance space 200. Furthermore, the heat exchanger core pull assembly 10 is plugged into the housing 101 so that the fourth support flange 24 overlaps the second support flange 22. The first core 11 and the second core 12 are detachably connected. The first core 11 can be disassembled to perform an in-service inspection of the second core 12. For example, the first core 11 can be removed alone through the first support flange 21, while the second core 12 is located in the shell 101 and can be replaced with the second core 12 through the fourth support flange 24. The heat exchanger core extraction assembly 10 does not need to be replaced as a whole, saving maintenance costs. Along the direction of the maintenance space 200, the second support flange 22 effectively supports the first support flange 21 and the fourth support flange 24, and can ensure the relative position of the first core 11 and the second core 12. This provides the heat exchanger 100 with a basis for detachable connection, and regular in-service inspections can be performed on the vulnerable parts in the heat exchanger 100, such as the second core 12, to improve the convenience of maintenance.

[0057] like Figure 4 、 Figure 5 and Figure 6 As shown, the core pulling structure further includes a monitoring mechanism 40, which has a first air path 41 and a second air path 42. The first air path 41 and the second air path 42 are both provided with an air pressure monitoring device 43, wherein the first air path 41 is used to supply air to the first sealing ring cavity 111 between the first core body 11 and the second core body 12. When the air pressure of the first air path 41 reaches a preset value, the first sealing ring cavity 111 is sealed;

[0058] The second gas path 42 is used to supply gas to the second sealing ring cavity 112 between the second core 12 and the shell 101 of the heat exchanger 100. When the gas pressure of the second gas path 42 reaches a preset value, the second sealing ring cavity 112 is sealed.

[0059] Specifically, when the first core 11 and the second core 12 are plugged in, a first sealing ring cavity 111 is formed between the first core 11 and the second core 12, and the first gas path 41 is connected to the first sealing ring cavity 111 to supply gas to the first sealing ring cavity 111 and monitor the gas pressure in the first sealing ring cavity 111 in real time, so that the fluid level in the heat exchanger 100 is guaranteed to be within a reasonable safety range, avoiding long-term micro-leakage of gas and the liquid level rising to the overlap of the first support flange 21 and the fourth support flange 24, thereby ensuring the safety and reliability of the sealing structure.

[0060] Similarly, when the second core 12 is plugged into the outer shell 101, a second sealing ring cavity 112 is formed between the second core 12 and the outer shell 101, and the second gas path 42 is connected to the second sealing ring cavity 112. By supplying gas to the second sealing ring cavity 112 and monitoring the gas pressure therein in real time, the fluid level in the heat exchanger 100 is maintained within a reasonable safety range, preventing the fluid level from rising to the junction of the fourth support flange 24 and the second support flange 22 due to long-term micro-leakage of gas, thereby ensuring the safety and reliability of the sealing structure.

[0061] In addition, the core pulling structure also includes an emptying pipe 60, which is disposed in the first core 11 and extends into the second core 12. By sequentially extending the emptying pipe 60 into the first core 11 and the second core 12, the defect of the fluid in the lower half of the heat exchanger core pulling assembly 10 being difficult to empty is overcome, and the fluid in the second core 12 is emptied, providing a basis for in-service inspection.

[0062] like Figure 7 As shown, this embodiment further provides an in-service inspection method for a core pulling structure. The in-service inspection method for a core pulling structure is implemented using the above-mentioned core pulling structure. The in-service inspection method for a core pulling structure includes the following steps:

[0063] S10, draining the molten salt in the first core 11 of the heat exchanger 100;

[0064] S20, draining the molten salt in the second core 12 of the heat exchanger 100;

[0065] S30 , removing the first core 11 from the heat exchanger 100 and inspecting the second core 12 .

[0066] Specifically, by providing a first support flange 21, a fourth support flange 24, and a third support flange 31, the heat exchanger core pull assembly 10 can be detachably connected to the housing 101. The heat exchanger core pull assembly 10 includes a first core body 11 and a second core body 12, which are interconnected and detachably connected, so that the heat exchanger core pull assembly 10 has the basis for complete emptying during an in-service inspection. This overcomes the problem that the original heat exchanger 100 is structurally limited and does not allow for in-service inspection. At the same time, it overcomes the problem that the heat exchanger core pull assembly 10 cannot empty the internal molten salt during an in-service inspection, making it impossible to replace wearing parts.

[0067] Among them, by draining the fluid, i.e., molten salt, in the first core 11 and the second core 12, the first core 11 is removed, so that maintenance personnel can perform in-service inspection on the second core 12, thereby improving the service life of the heat exchanger 100 and overcoming the problem that in-service inspection could not be performed.

[0068] like Figure 6 As shown, in this embodiment, step S10 further includes the following steps:

[0069] The inlet pipe 51 connected to the gas source 50 is extended into the first core 11, and the outlet pipe 71 connected to the storage tank 70 is also extended into the first core 11, the gas source 50 and the storage tank 70 are connected, and the molten salt in the first core 11 is emptied.

[0070] Specifically, the molten salt in the heat exchanger core extraction assembly 10 is emptied using an emptying device to facilitate in-service inspection. The emptying device includes a storage tank 70, a gas source 50, an inlet pipe 51 and an outlet pipe 71. A second valve body 72 is provided on the outlet pipe 71. A first valve body 52 is also provided between the inlet pipe 51 and the outlet pipe 71. In addition, the gas source 50 also includes a buffer tank 53. Its working principle is as follows: first, the first valve body 52 is closed and the second valve body 72 is opened, and then gas is flushed into the buffer tank 53 through the gas source 50. The gas is an inert protective gas and will not be described in detail here. The molten salt in the first core 11 is gradually emptied through the air pressure difference between the buffer tank 53 and the storage tank 70. This facilitates the removal of the first core 11 and facilitates the in-service inspection of the second core 12.

[0071] Furthermore, step S20 further includes the following steps:

[0072] The drain pipe 60 is extended into the second core 12 , the outlet pipe 71 is closed by closing the second valve body 72 , the drain pipe 60 connected to the storage tank 70 is connected, and the gas source 50 is connected at the same time to drain the molten salt in the second core 12 .

[0073] Specifically, when the molten salt liquid level in the first core 11 drops to the junction of the first core 11 and the second core 12, step S10 is completed. At the same time, step S20 is performed, the first valve body 52 and the second valve body 72 are closed, the drain pipe 60 is extended into the second core 12, and gas is injected into the buffer tank 53 through the gas source 50. The gas enters the drain pipe 60 and gradually drains the molten salt in the second core 12 through the pressure difference between the buffer tank 53 and the storage tank 70, so that the emptied second core 12 has a basis for in-service inspection. Compared with the prior art where the heat exchanger 100 is an integrated structure that cannot be disassembled, the structural limitation of the in-service inspection is overcome, and there is no need to interrupt the molten salt reactor, which reduces maintenance costs and increases the service life of the heat exchanger 100.

[0074] In this embodiment, step S30 further includes the following steps:

[0075] After the in-service inspection of the second core 12 , if repair or replacement is required, the second core 12 can be removed from the shell 101 of the heat exchanger 100 through the fourth supporting flange 24 .

[0076] Specifically, after the first core 11 is removed from the housing 101, the molten salt in the second core 12 can be drained and then an in-service inspection can be performed directly. If a problem occurs with the second core 12 during the inspection, the second core 12 can be removed and repaired externally or replaced entirely. When removing the second core 12, the fourth support flange 24 can be directly removed and lifted toward the inspection space 200 to remove the second core 12 from the housing 101 of the heat exchanger 100.

[0077] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the 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, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A core-pulling structure, which is applied to a heat exchanger and is characterized in that: The heat exchanger has an inspection space on its circumference, and the core-pulling structure includes a heat exchanger core-pulling assembly, and the heat exchanger core-pulling assembly includes a connecting assembly. Along the direction of the inspection space, the heat exchanger core-pulling assembly and the outer shell of the heat exchanger are detachably connected through the connecting assembly. The core-pulling structure also includes a supporting assembly, and the supporting assembly is used to support the connecting assembly, and the connecting assembly is detachably connected to the supporting assembly. The connecting assembly includes a first supporting flange, and the heat exchanger core-pulling assembly can be inserted into the outer shell of the heat exchanger. The first supporting flange is arranged on the outer circumference of the heat exchanger core-pulling assembly. When the heat exchanger core-pulling assembly is inserted into the outer shell of the heat exchanger, the first supporting flange overlaps the outer shell of the heat exchanger. The connecting assembly also includes a second supporting flange, and the second supporting flange is arranged on the outer circumference of the outer shell of the heat exchanger and Corresponding to the first supporting flange, when the heat exchanger core pulling assembly is inserted into the outer shell of the heat exchanger, the first supporting flange overlaps the second supporting flange, and the connecting assembly also includes a fourth supporting flange. The heat exchanger core pulling assembly includes a first core body and a second core body, wherein the first supporting flange is arranged on the outer peripheral side of the first core body, and the fourth supporting flange is arranged on the outer peripheral side of the second core body. The first core body can be inserted into the second core body. When the first core body and the second core body are plugged into the outer shell of the heat exchanger in turn, the first supporting flange and the fourth supporting flange are overlapped on the second supporting flange in turn along the direction of the maintenance space.

2. The core-pulling structure according to claim 1, characterized in that: The support assembly includes a third support flange, which is provided with a receiving hole for receiving the outer shell of the heat exchanger. When the outer shell of the heat exchanger is inserted into the receiving hole, the second support flange overlaps the third support flange.

3. The core-pulling structure according to claim 1, characterized in that: The core pulling structure further includes a monitoring mechanism, which includes a first air path and a second air path, and air pressure monitoring equipment is provided on both the first air path and the second air path, wherein the first air path is used to supply air to a first sealing ring cavity between the first core body and the second core body, and when the air pressure of the first air path reaches a preset value, the first sealing ring cavity is sealed; The second air path is used to supply air to a second sealing ring cavity between the second core and the shell of the heat exchanger. When the air pressure of the second air path reaches a preset value, the second sealing ring cavity is sealed.

4. The core-pulling structure according to claim 3, characterized in that: The core-pulling structure further includes an exhaust pipe, which is disposed inside the first core and extends into the second core.

5. A method for in-service inspection of a core-pulling structure, wherein the method is implemented by using the core-pulling structure according to any one of claims 1 to 4, and is characterized in that: The in-service inspection method of the core pulling structure comprises the following steps: S10, draining the molten salt from the first core of the heat exchanger; S20, draining the molten salt in the second core of the heat exchanger; S30: Remove the first core from the heat exchanger and inspect the second core.

6. The in-service inspection method for a core pulling structure according to claim 5, characterized in that: Step S10 also includes the following steps: An inlet pipe connected to a gas source is extended into the first core, and an outlet pipe connected to a storage tank is also extended into the first core, the gas source and the storage tank are connected, and the molten salt in the first core is emptied.

7. The in-service inspection method for a core pulling structure according to claim 6, characterized in that: Step S20 also includes the following steps: The exhaust pipe is extended into the second core, the outlet pipe is closed, the exhaust pipe connected to the storage tank is connected, and the gas source is connected at the same time to exhaust the molten salt in the second core.

8. The in-service inspection method for a core pulling structure according to claim 7, characterized in that: Step S30 also includes the following steps: After the in-service inspection of the second core, if repair or replacement is required, the second core can be removed from the shell of the heat exchanger through the fourth supporting flange.

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