Flow distribution structure of primary side inlet of heat exchanger

Abstract

The invention discloses a heat exchanger primary side inlet flow distribution structure which is used for guiding a medium into a heat exchanger, the heat exchanger communicates with a molten salt pump assembly through an inlet pipe nozzle, and the heat exchanger primary side inlet flow distribution structure comprises a first distribution part which is annularly arranged on a shell of the heat exchanger; the heat exchanger is arranged on the side portion of the molten salt pump assembly, the first distribution part is provided with a distribution ring cavity, all heat exchange pipes in the heat exchanger are communicated with the distribution ring cavity, the heat exchanger primary side inlet flow distribution structure further comprises a second distribution part, the second distribution part is arranged in the heat exchange pipes, and the first distribution part is communicated with the second distribution part. And the second distribution part is used for enabling the flow of the medium flowing into the middle area of the heat exchange tube to be equal to the flow of the medium close to the tube wall of the heat exchange tube. The first distribution part is used for uniformly distributing the primary side medium for the first time, and the second distribution part is additionally arranged, so that the primary side medium uniformly entering the heat exchange tube is uniformly distributed again.

Description

Technical Field

[0001] The invention relates to the field of molten salt driven heat exchange, and in particular to a primary side inlet flow distribution structure of a heat exchanger. 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 cycle and transmitting nuclear fission energy (heat energy). The molten salt reactor loop system consists of equipment and pipelines such as heat exchangers, molten salt pumps, etc. Among them, the heat exchanger can adopt a heat exchange core structure such as a shell and tube type, a U-shaped tube type or a winding tube type, which has high reliability. The heat exchange core is connected to the upper inlet water chamber through a heat exchange tube sheet. The molten salt pump is usually arranged separately from the heat exchanger and connected to the inlet water chamber through a pipeline. When the molten salt pump inputs heat energy into the heat exchanger for heat exchange, it is easy to cause uneven heat transfer when the heat exchange tubes in the core of the heat exchanger transmit the medium. This is because the heat exchange cores of the heat exchanger located below are evenly distributed in various positions in the heat exchanger, and the flow state of the molten salt after entering the upper inlet water chamber is complex, and the flow uniformity entering each heat exchange core is poor, which affects the heat exchange efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of uneven heat transfer and poor heat exchange efficiency in the prior art and to provide a primary side inlet flow distribution structure of a heat exchanger.

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

[0005] A heat exchanger primary side inlet flow distribution structure, the heat exchanger primary side inlet flow distribution structure is used to introduce medium into the heat exchanger, the heat exchanger is connected to a molten salt pump assembly through an inlet nozzle, the heat exchanger primary side inlet flow distribution structure includes a first distribution part, the first distribution part is arranged in an annular shape on the outer shell of the heat exchanger, the heat exchanger is arranged on the side of the molten salt pump assembly, the first distribution part has a distribution ring cavity, and each heat exchange tube in the heat exchanger is connected to the distribution ring cavity, the heat exchanger primary side inlet flow distribution structure also includes a second distribution part, the second distribution part is arranged in the heat exchange tube, the second distribution part is used to make the medium flowing into the middle area of ​​the heat exchange tube and the medium flow close to the tube wall of the heat exchange tube equal.

[0006] In this solution, by setting the heat exchanger on the side of the molten salt pump assembly to change the direction of the primary side medium in the molten salt pump assembly flowing into the heat exchanger, it can cooperate with the distribution ring cavity of the first distribution part to evenly introduce the primary side medium into each heat exchange tube with different positions, improve the uniformity of heat transfer and heat exchange, and improve the heat exchange efficiency of the heat exchanger. Furthermore, in addition to the first distribution part for the first uniform diversion of the primary side medium, a second distribution part is additionally provided to evenly divert the primary side medium that evenly enters the heat exchanger again, to prevent the primary side medium entering the heat exchanger from flowing from the tube wall of the heat exchange tube due to the small flow resistance, while the primary side medium flow rate in the middle area of ​​the heat exchange tube is small, resulting in uneven heat transfer. The first distribution part and the second distribution part cooperate with each other to fully ensure that the heat exchange of the heat exchanger is more uniform and the heat exchange efficiency is improved.

[0007] Preferably, the heat exchange tube has a secondary flow tube, and the medium flowing into the heat exchange tube from the distribution ring cavity is filled between the tube wall of the secondary flow tube and the tube wall of the heat exchange tube, and the second distribution part includes a flow distribution plate, and a second flow distribution hole is opened on the flow distribution plate, and the secondary flow tube is inserted into the second flow distribution hole, and the size of the second flow distribution hole close to the tube wall of the heat exchange tube is smaller than the size of the second flow distribution hole close to the middle area of ​​the heat exchange tube.

[0008] In this solution, through the above arrangement, the primary side medium in the heat exchange tube is evenly distributed between the tube wall of the secondary side flow tube and the tube wall of the heat exchange tube, so as to achieve the purpose of uniform heat transfer.

[0009] Preferably, the first distribution part has multiple groups of first flow distribution holes, and the multiple groups of first flow distribution holes are arranged corresponding to the heat exchange tubes. Along the height direction of the heat exchange tubes, the connection between the first flow distribution holes and the heat exchange tubes is located above the flow distribution plate.

[0010] In this solution, the above arrangement enables the primary side medium entering the heat exchange tube to be located above the flow distribution plate, thereby preventing the primary side medium from transferring heat in the heat exchange tube without passing through the flow distribution plate, which may cause uneven flow and heat transfer.

[0011] Preferably, the number of the multiple groups of the first flow distribution holes ranges from 8 to 36.

[0012] In this solution, the above arrangement is adopted to ensure that the flow rates of the primary side media entering each heat exchange tube are kept constant.

[0013] Preferably, the number of the first flow distribution holes in each group is 2-6.

[0014] In this solution, the above arrangement is used to ensure that the flow rate of the primary side medium entering the heat exchange tube at the same time meets the heat transfer and heat exchange requirements, that is, to ensure the heat exchange efficiency.

[0015] Preferably, a plurality of the first flow distribution holes in each group are arranged in sequence along the height direction of the heat exchange tube, and each group of the first flow distribution holes is located in the distribution ring cavity.

[0016] In this solution, the above arrangement is used to make the space occupied by each group of first flow distribution holes in the distribution ring cavity smaller, thereby avoiding the situation where the distance between each group of first flow distribution holes is too close due to a large number of groups, which increases the difficulty of distribution when the primary side medium flows into the distribution ring cavity.

[0017] Preferably, there is a gap between the shell of the heat exchanger and the heat exchange tube, and the gap extends from the connection point between the distribution ring cavity and the heat exchange tube to the outlet of the heat exchange tube. The primary side inlet flow distribution structure of the heat exchanger also includes a first throttling part, which is arranged in the gap, and the first throttling part is correspondingly arranged below the connection point between the distribution ring cavity and the heat exchange tube.

[0018] In this solution, the above arrangement is used to prevent the primary side medium from leaking out in large quantities from the circumferential gap of the heat exchanger when flowing into the heat exchange tube, thereby ensuring sufficient flow of the primary side medium.

[0019] Preferably, the heat exchanger primary side inlet flow distribution structure further includes a second throttling portion, the second throttling portion is arranged in the gap, and the second throttling portion is correspondingly arranged above the outlet of the heat exchange tube.

[0020] In this solution, the above arrangement is used to prevent the primary side medium from flowing into the gap when flowing out of the heat exchange tube and repeatedly transferring heat to the outer wall of the heat exchange tube, thereby avoiding uneven heat exchange.

[0021] Preferably, the first throttling portion and the second throttling portion are both throttling baffle rings.

[0022] In this solution, the above arrangement is used to achieve effective blocking of the gap.

[0023] Preferably, the inlet nozzle is connected to the heat exchanger through the distribution ring cavity, and the cross-section of the distribution ring cavity is a semicircular structure.

[0024] In this solution, the above arrangement is used to ensure uniformity of flow of the primary side medium in the distribution ring cavity.

[0025] The positive and progressive effect of the present invention is that the present invention can cooperate with the distribution ring cavity of the first distribution part by arranging the heat exchanger on the side of the molten salt pump assembly, and evenly introduce the primary side medium into each heat exchange tube at different positions, thereby improving the uniformity of flow and heat exchange and improving the heat exchange efficiency of the heat exchanger. Furthermore, in addition to the first distribution part uniformly diverting the primary side medium for the first time, a second distribution part is additionally provided to evenly divert the primary side medium that evenly enters the heat exchange tube again, so as to prevent the primary side medium entering the heat exchanger from flowing from the tube wall of the heat exchange tube due to the small flow resistance, while the primary side medium flow rate in the middle area of ​​the heat exchange tube is small and the heat transfer is uneven. The first distribution part and the second distribution part cooperate with each other to fully ensure that the heat exchange efficiency of the heat exchanger is improved, the heat exchange is more uniform, and no secondary heat exchange is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a molten salt pump assembly and a heat exchanger according to an example of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of a heat exchange tube according to an example of the present invention;

[0028] Figure 3 A schematic diagram of the structure of a shell of a heat exchanger according to an example of the present invention;

[0029] Figure 4 for Figure 1 CC section view;

[0030] Figure 5 A flow bar graph of a first flow distribution hole according to an example of the present invention;

[0031] Figure 6 for Figure 1 A partial enlarged view of middle A;

[0032] Figure 7 for Figure 1 A partial enlarged view of B in the middle;

[0033] Figure 8 It is a structural schematic diagram of a second distribution part of an example of the present invention;

[0034] Fig. 9 for Figure 1 DD cross-sectional view;

[0035] Fig.10 This is a flow bar graph of a heat exchange component according to an example of the present invention.

[0036] Description of reference numerals:

[0037] Heat Exchanger 100

[0038] Housing 101

[0039] Heat exchange tube 102

[0040] Exit 1021

[0041] Secondary side flow tube 103

[0042] Molten salt pump assembly 200

[0043] Import nozzle 300

[0044] The first distribution unit 10

[0045] Distribution ring cavity 11

[0046] The first flow distribution hole 111

[0047] Second distribution unit 20

[0048] Flow distribution plate 21

[0049] The second flow distribution hole 211

[0050] Gap 30

[0051] The first throttle portion 40

[0052] Second throttle portion 50 DETAILED DESCRIPTION

[0053] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0054] This embodiment provides a heat exchanger primary side inlet flow distribution structure, the specific structure is as follows Figure 1 , Figure 2 , Figure 3 and Figure 8 As shown, the heat exchanger primary side inlet flow distribution structure is used to introduce medium into the heat exchanger 100, and the heat exchanger 100 is connected to the molten salt pump assembly 200 through the inlet nozzle 300. The heat exchanger primary side inlet flow distribution structure includes a first distribution part 10, which is arranged in an annular shape on the outer shell 101 of the heat exchanger 100. The heat exchanger 100 is arranged on the side of the molten salt pump assembly 200. The first distribution part 10 has a distribution ring cavity 11, and each heat exchange tube 102 in the heat exchanger 100 is connected to the distribution ring cavity 11. The heat exchanger primary side inlet flow distribution structure also includes a second distribution part 20, which is arranged in the heat exchange tube 102. The second distribution part 20 is used to make the medium flowing into the middle area of ​​the heat exchange tube 102 and the medium flow close to the tube wall of the heat exchange tube 102 equal.

[0055] Specifically, the heat exchanger 100 is located at the side of the molten salt pump assembly 200. On this basis, compared with the case where the molten salt pump assembly 200 is located above the heat exchanger 100, the space above the heat exchanger 100 is released, so that the internal structure of the heat exchanger 100, for example, the heat exchange tube 102 and the heat exchanger 100 have a basis for detachable maintenance, and the in-service inspection, maintenance and replacement of the heat exchange tube 102 are implemented. In addition, the heat exchange tube 102 and the shell 101 are detachably connected by using the space above the shell 101, thereby changing the direction of the primary side medium in the molten salt pump assembly 200 when flowing into the heat exchanger 100, so that the primary side medium flows from the top of the heat exchanger 100 to the side of the heat exchanger 100. The medium in this embodiment is the primary side medium flowing from the molten salt pump assembly 200 into the heat exchanger 100. The primary side medium has a higher temperature. After entering the heat exchange tube 102, it contacts and exchanges heat with the internal structure of the heat exchange tube 102, which is also called heat transfer.

[0056] In this embodiment, a first distribution part 10 is provided on the outer peripheral side of the housing 101, and the first distribution part 10 is used to evenly distribute the primary side medium flowing in from the side to each heat exchange tube 102, so as to ensure that the flow rate flowing into each heat exchange tube 102 is equal. The first distribution part 10 has a distribution ring cavity 11, and each heat exchange tube 102 is located at a different position in the housing 101 and is connected to the distribution ring cavity 11. The primary side medium flowing in from the molten salt pump assembly 200 flows into the distribution ring cavity 11 and then flows into each heat exchange tube 102 evenly through the distribution ring cavity 11, so as to achieve uniformity of heat transfer and heat exchange, and improve the heat exchange efficiency of the heat exchanger 100.

[0057] Furthermore, in this embodiment, in addition to the first distribution part 10 performing the first uniform flow distribution for the primary side medium, a second distribution part 20 is additionally provided. The second distribution part 20 is located in the heat exchange tube 102. The primary side medium flows into the heat exchange tube 102 after being uniformly distributed by the first distribution part 10. Since there is a certain space in the heat exchange tube 102, the flow velocity of the primary side medium flowing in the area close to the wall of the heat exchange tube 102 and the flow velocity close to the middle area of ​​the heat exchange tube 102 are different. It can be understood that, except for the middle area and the middle area of ​​the heat exchange tube 102, the flow velocity of the primary side medium flowing in is different. In addition to the tube wall area, there is also a peripheral area close to the tube wall, which is located between the tube wall area and the middle area, and the additionally provided second distribution part 20 can evenly distribute the primary side medium entering the heat exchange tube 102 again, so that the primary side medium flow rate is equal in the tube wall area, the peripheral area or the middle area, so as to prevent the primary side medium entering the heat exchange tube 102 from concentrating on flowing from the tube wall of the heat exchange tube 102 due to the difference in flow resistance, while the primary side medium flow rate in the middle area of ​​the heat exchange tube 102 is small, resulting in uneven heat transfer. The first distribution part 10 and the second distribution part 20 cooperate with each other to fully ensure that the heat exchange efficiency of the heat exchanger 100 is improved and the heat exchange is more uniform.

[0058] like Figure 8 As shown, in this embodiment, a secondary flow tube 103 is provided in the heat exchange tube 102, and the medium flowing into the heat exchange tube 102 from the distribution ring cavity 11 is filled between the tube wall of the secondary flow tube 103 and the tube wall of the heat exchange tube 102, and the second distribution part 20 includes a flow distribution plate 21, and a second flow distribution hole 211 is opened on the flow distribution plate 21, and the secondary flow tube 103 is penetrated in the second flow distribution hole 211, and the size of the second flow distribution hole 211 close to the tube wall of the heat exchange tube 102 is smaller than the size of the second flow distribution hole 211 close to the middle area of ​​the heat exchange tube 102.

[0059] Specifically, the flow distribution plate 21 is filled in the heat exchange tube 102 along the radial direction, and the secondary side flow tube 103 in the heat exchange tube 102 is used to flow the medium to be heat exchanged. When the primary side medium flows into the heat exchange tube 102, it is filled between the tube wall of the secondary side flow tube 103 and the tube wall of the heat exchange tube 102 to achieve heat transfer, that is, heat exchange, for the medium in the secondary side flow tube 103. The flow distribution plate 21 is provided with a plurality of second flow distribution holes 211, and the secondary flow tube 103 is inserted into the second flow distribution holes 211. The second flow distribution holes 211 are used to evenly distribute the primary medium flowing into the heat exchange tube 102 again, so that the size of the second flow distribution holes 211 near the tube wall of the heat exchange tube 102 is smaller than the size of the second flow distribution holes 211 near the middle area of ​​the heat exchange tube 102, so as to solve the problem that the flow velocity of the primary medium near the tube wall of the heat exchange tube 102 is greater than the flow velocity of the primary medium near the middle area of ​​the heat exchange tube 102, that is, to solve the problem of uneven flow velocity and flow at different positions in the heat exchange tube 102. The primary medium in the heat exchange tube 102 is evenly distributed between the tube wall of the secondary flow tube 103 and the tube wall of the heat exchange tube 102, so as to achieve the purpose of uniform heat transfer.

[0060] In this embodiment, the first distribution portion 10 has a plurality of first flow distribution holes 111 . Along the height direction of the heat exchange tube 102 , the connection between the first flow distribution holes 111 and the heat exchange tube 102 is located above the flow distribution plate 21 .

[0061] Specifically, a plurality of groups of first flow distribution holes 111 are arranged in a circle on the housing 101. The first flow distribution holes 111 are respectively connected to the heat exchange tubes 102, and the connection point is located above the flow distribution plate 21, so that when the primary side medium enters the heat exchange tube 102, it is always located above the flow distribution plate 21, and is evenly distributed again through the flow distribution plate 21, so as to prevent the primary side medium from not passing through the flow distribution plate 21 and transferring heat in the heat exchange tube 102, which causes uneven flow and heat exchange.

[0062] Furthermore, the number of the plurality of groups of first flow distribution holes 111 ranges from 8 to 36.

[0063] Specifically, Figure 4 and Figure 5 As shown, in this embodiment, the number of groups of the first flow distribution holes 111 is 16 as an example for explanation, but it is not limited thereto. Similarly, the number of heat exchange tubes 102 is 19 as an example for explanation, but it is not limited thereto. By setting the first distribution part 10, the flow rate of the primary side medium flowing out of the 16 groups of first flow distribution holes 111 after the first uniform flow distribution tends to be the same, that is, the first uniform flow distribution is achieved. By setting the second distribution part 20, the flow rate flowing from the first flow distribution hole 111 into each position in the heat exchange tube 102 tends to be the same, that is, the second uniform flow distribution is achieved. Through the mutual cooperation of the first distribution part 10 and the second distribution part 20, the primary side medium undergoes two uniform flows, so that the flow rate of the primary side medium entering each heat exchange tube 102 is equal, and the flow rate at each position in the heat exchange tube 102 is equal, so as to achieve uniform heat exchange with the secondary side flow tube 103.

[0064] like Fig. 9 and Fig.10 As shown, in this embodiment, 19 heat exchange tubes are arranged below the second distribution part 20 along the height direction of the heat exchanger 100, and a heat exchange component is provided in the heat exchange tube 102 located below the second distribution part 20. The flow of the primary side medium is evenly divided by the first distribution part 10 and the second distribution part 20, so that the flow of the primary side medium flowing through the second distribution part 20 and entering the 19 heat exchange tubes 102 below the second distribution part 20 tends to be consistent.

[0065] It should be noted that the heat exchange tube 102 located at the axis of the heat exchanger 100 not only performs heat exchange, but also has a secondary medium introduction tube at its center, resulting in limited internal space. Therefore, the number of heat exchange components arranged in the heat exchange tube 102 located at the axis of the heat exchanger 100 is less than that in other heat exchange tubes 102. Fig.10 It can be seen that the flow rate is lower than the flow rates in other heat exchange tubes 102 , which does not mean that the flow rate of the primary side medium is uneven after passing through the first distribution part 10 and the second distribution part 20 .

[0066] In this embodiment, the number of each group of first flow distribution holes 111 is 2-6.

[0067] Specifically, from the cross-section, each group of first flow distribution holes 111 is arranged in sequence along the height direction of the housing 101. This embodiment is described with the number of each group of first flow distribution holes 111 being 4, but it is not limited thereto. The 4 first flow distribution holes 111 in each group are connected to the distribution ring cavity 11, so that the space occupied by each group of first flow distribution holes 111 in the distribution ring cavity 11 is smaller, avoiding the large number of groups causing each group of first flow distribution holes 111 to be too close, affecting the complexity of the flow distribution of the primary side medium. At the same time, it also ensures that the flow of the primary side medium entering the heat exchange tube 102 at the same time meets the heat transfer and heat exchange requirements, that is, the heat exchange efficiency is guaranteed.

[0068] It can be understood that the height direction of the shell 101 is in the same direction as the height direction along the heat exchange tube 102, and the height of the flow distribution plate 21 along the height direction of the shell 101 is lower than the height of the lowest first flow distribution hole 111 among the four first flow distribution holes 111.

[0069] like Figure 6 As shown, in this embodiment, there is a gap 30 between the shell 101 of the heat exchanger 100 and the heat exchange tube 102, and the gap 30 extends from the connection point between the distribution ring cavity 11 and the heat exchange tube 102 to the outlet 1021 of the heat exchange tube 102. The heat exchanger primary side inlet flow distribution structure also includes a first throttling portion 40, and the first throttling portion 40 is arranged in the gap 30, and the first throttling portion 40 is correspondingly arranged below the connection point between the distribution ring cavity 11 and the heat exchange tube 102.

[0070] Specifically, the distribution ring cavity 11 is arranged on the shell 101, and similarly, the first flow distribution hole 111 is also arranged on the shell 101, and the heat exchange tube 102 is located in the shell 101, and a gap is formed between the heat exchange tube 102 and the shell 101, and the primary side medium flowing into the heat exchange tube 102 through the first flow distribution hole 111 needs to pass through the gap 30. In order to prevent a large amount of primary side medium from flowing into the gap 30 instead of the heat exchange tube 102 after the first uniform flow distribution, or most of the primary side medium flows into the gap 30, and only a small part of the primary side medium flows into the heat exchange tube 102, the present embodiment is provided with a first throttling part 40 below the gap 30 corresponding to the connection between the distribution ring cavity 11 and the heat exchange tube 102, so as to block the gap 30 there, and prevent the primary side medium from leaking out after the first uniform flow distribution, so as to ensure that the flow of the primary side medium entering the heat exchange tube 102 is sufficient.

[0071] like Figure 7 As shown, in this embodiment, the heat exchanger primary side inlet flow distribution structure also includes a second throttling portion 50, the second throttling portion 50 is arranged in the gap 30, and the second throttling portion 50 is correspondingly arranged above the outlet 1021 of the heat exchange tube 102.

[0072] It can be understood that the gap 30 extends from the connection point between the distribution ring cavity 11 and the heat exchange tube 102 to the outlet 1021 of the heat exchange tube 102, and the outlet 1021 is located below the second throttling portion 50. The outlet 1021 is used to discharge the primary side medium after heat exchange in the heat exchange tube 102. The temperature of the primary side medium after heat exchange is lower than the primary side medium undergoing heat exchange in the heat exchange tube 102. The second throttling portion 50 is provided above the outlet 1021 to prevent the primary side medium with a temperature lower than that undergoing heat exchange from flowing into the gap 30 and contacting the outer surface of the heat exchange tube 102, so as to prevent the primary side medium from flowing into the gap 30 when flowing out of the heat exchange tube 102 and repeatedly transferring heat to the outer surface of the heat exchange tube 102, thereby avoiding uneven heat exchange.

[0073] In this embodiment, the first throttle portion 40 and the second throttle portion 50 are both throttle baffles. The throttle baffle is an annular structure and is filled in the gap 30. The throttle baffle is a structure used in the prior art to reduce leakage of the flowing medium, so that the leakage in the gap 30 is reduced to a minimum through the throttle baffle.

[0074] Of course, in other embodiments, the first throttle portion 40 and the second throttle portion 50 may also be other high temperature resistant blocking structures in the prior art, which will not be elaborated herein.

[0075] In this embodiment, the inlet nozzle 300 is connected to the heat exchanger 100 through the distribution ring cavity 11, and the cross section of the distribution ring cavity 11 is a semicircular structure.

[0076] Specifically, from a cross-sectional view, the distribution ring cavity 11 is a semicircular structure and is buckled onto the outer shell 101. The two ends of the inlet nozzle 300 are respectively connected to the distribution ring cavity 11 and the molten salt pump assembly 200, so as to enable the primary side medium to be introduced into the distribution ring cavity 11 for the first uniform diversion, so that the primary side medium in the distribution ring cavity 11 can flow around the annular cavity through various positions, thereby ensuring the circumferential flow uniformity of the primary side medium when entering the heat exchanger outer shell 101.

[0077] 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 heat exchanger primary side inlet flow distribution structure, the heat exchanger primary side inlet flow distribution structure is used to introduce a medium into the heat exchanger, the heat exchanger is connected to the molten salt pump assembly through an inlet nozzle, characterized in that: The heat exchanger primary side inlet flow distribution structure includes a first distribution part, which is arranged in a ring on the outer shell of the heat exchanger. The heat exchanger is arranged on the side of the molten salt pump assembly. The first distribution part has a distribution ring cavity, and each heat exchange tube in the heat exchanger is connected to the distribution ring cavity. The heat exchanger primary side inlet flow distribution structure also includes a second distribution part, which is arranged in the heat exchange tube. The second distribution part is used to make the medium flowing into the middle area of ​​the heat exchange tube and the medium flow close to the tube wall of the heat exchange tube equal.

2. The heat exchanger primary side inlet flow distribution structure according to claim 1, characterized in that: The heat exchange tube has a secondary flow tube in it, and the medium flowing into the heat exchange tube from the distribution ring cavity is filled between the tube wall of the secondary flow tube and the tube wall of the heat exchange tube. The second distribution part includes a flow distribution plate, and a second flow distribution hole is opened on the flow distribution plate. The secondary flow tube is inserted into the second flow distribution hole, and the size of the second flow distribution hole close to the tube wall of the heat exchange tube is smaller than the size of the second flow distribution hole close to the middle area of ​​the heat exchange tube.

3. The heat exchanger primary side inlet flow distribution structure according to claim 2, characterized in that: The first distribution part has multiple groups of first flow distribution holes, and the multiple groups of first flow distribution holes are arranged corresponding to the heat exchange tubes. Along the height direction of the heat exchange tubes, the connection between the first flow distribution holes and the heat exchange tubes is located above the flow distribution plate.

4. The heat exchanger primary side inlet flow distribution structure according to claim 3, characterized in that: The number of the plurality of groups of the first flow distribution holes ranges from 8 to 36.

5. The heat exchanger primary side inlet flow distribution structure according to claim 3, characterized in that: The number of the first flow distribution holes in each group is 2-6.

6. The heat exchanger primary side inlet flow distribution structure according to claim 5, characterized in that: The plurality of first flow distribution holes in each group are sequentially arranged along the height direction of the heat exchange tube, and the first flow distribution holes in each group are located in the distribution ring cavity.

7. The heat exchanger primary side inlet flow distribution structure according to claim 1, characterized in that: There is a gap between the shell of the heat exchanger and the heat exchange tube, and the gap extends from the connection point between the distribution ring cavity and the heat exchange tube to the outlet of the heat exchange tube. The primary side inlet flow distribution structure of the heat exchanger also includes a first throttling part, which is arranged in the gap, and the first throttling part is correspondingly arranged below the connection point between the distribution ring cavity and the heat exchange tube.

8. The heat exchanger primary side inlet flow distribution structure according to claim 7, characterized in that: The heat exchanger primary side inlet flow distribution structure also includes a second throttling portion, the second throttling portion is arranged in the gap, and the second throttling portion is correspondingly arranged above the outlet of the heat exchange tube.

9. The heat exchanger primary side inlet flow distribution structure according to claim 8, characterized in that: The first throttling portion and the second throttling portion are both throttling baffle rings.

10. The heat exchanger primary side inlet flow distribution structure according to claim 1, characterized in that: The inlet nozzle is communicated with the heat exchanger through the distribution ring cavity, and the cross section of the distribution ring cavity is a semicircular structure.

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