Guide cylinder and supercritical water cooled reactor

Abstract

The invention provides a guide cylinder and a supercritical water cooled reactor, the guide cylinder comprises a shell and at least one guide plate, the shell is internally provided with a containing cavity, the top of the shell is connected with a bearing plate, the bottom of the shell is connected with a reactor core upper plate or the top of a fuel assembly, and the bottom of the shell is provided with at least one circulation hole communicated with the containing cavity; a coolant enters or flows out of the accommodating cavity through the circulating hole; the guide plate is arranged in the containing cavity and extends in the axial direction of the shell, at least one first installation hole is formed in the side, facing the containing cavity, of the guide plate, a matching pipe is arranged in each first installation hole in a penetrating mode, and the control rod is inserted into the matching pipes. According to the guide cylinder, the guide plate and the matching pipe are arranged in the shell, and the control rod slides along the matching pipe, so that a coolant entering or flowing out of the fuel assembly does not generate overlarge load on the control rod when flowing out or entering the upper cavity, and compared with a traditional guide cylinder, a continuous guide section is omitted, the structure is simpler, and more space is saved; meanwhile, control rod guiding and coolant circulation are met.

Description

Technical Field

[0001] The invention relates to the technical field of supercritical water-cooled reactors, and in particular to a guide tube and a supercritical water-cooled reactor. Background Art

[0002] The supercritical water-cooled reactor is the only water-cooled reactor among the six reactor types identified for the fourth-generation nuclear energy system.

[0003] The function of the guide tube assembly of a supercritical water-cooled reactor is to provide a low-friction sliding channel for the control rod assembly, and at the same time, to prevent the coolant entering and flowing out of the fuel assembly from causing excessive load on the control rod assembly when flowing out and into the upper chamber. Currently, traditional guide tube assemblies are not suitable for supercritical water-cooled reactors.

[0004] Based on this, the inventor of the present application proposes a guide tube and a supercritical water-cooled reactor in order to solve the above technical problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defect that the guide cylinder assembly in the prior art cannot meet the use requirements of a supercritical water-cooled reactor, and to provide a guide cylinder and a supercritical water-cooled reactor.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a guide cylinder, which is characterized in that it comprises:

[0008] A shell having a containing cavity therein, wherein the top of the shell is connected to the support plate, the bottom of the shell is connected to the upper plate of the core, and the bottom of the shell is provided with at least one flow hole communicating with the containing cavity, through which the coolant enters or flows out of the containing cavity;

[0009] At least one guide plate is arranged in the accommodating cavity and extends axially along the shell. The guide plate is provided with at least one first mounting hole on one side facing the accommodating cavity. A matching tube is passed through each of the first mounting holes, and a control rod is inserted into the matching tube.

[0010] According to an embodiment of the present invention, the number of the guide plates is at least two, and at least two guide plates are arranged at intervals along the axial direction of the housing.

[0011] According to an embodiment of the present invention, one end of the guide plate is welded to the inner wall of the shell.

[0012] According to one embodiment of the present invention, opposite ends of the matching tube are welded to the guide plate.

[0013] According to an embodiment of the present invention, the guide plate is an annular plate, a avoidance hole is opened in the middle of the guide plate, and the first mounting hole is opened toward one side of the avoidance hole.

[0014] According to an embodiment of the present invention, the matching tube is a C-shaped tube and the opening end of the matching tube is in the same direction as the opening end of the first mounting hole.

[0015] According to one embodiment of the present invention, a mounting flange is provided on the top of the housing, and a cover plate is detachably connected to the outer side of the mounting flange;

[0016] The bottom of the mounting flange abuts against the top surface of the support plate, and the cover plate is provided with a matching hole communicating with the top space of the support plate and the accommodating cavity.

[0017] According to an embodiment of the present invention, the mounting flange and the cover plate are detachably connected via at least two threaded connectors.

[0018] According to one embodiment of the present invention, the number of the first mounting holes is at least two, and at least two of the first mounting holes are arranged at intervals around the circumference of the guide plate.

[0019] According to an embodiment of the present invention, the number of the flow holes is at least two, and at least two of the flow holes are arranged at intervals around the circumference of the housing.

[0020] According to an embodiment of the present invention, the housing includes at least two splicing units along its axial direction, and adjacent splicing units are detachably connected via threaded connectors.

[0021] According to one embodiment of the present invention, the housing is further provided with at least one second mounting hole, and the second mounting hole is communicated with the accommodating cavity and the outer side of the housing;

[0022] The second mounting hole is located in the middle of the housing.

[0023] The present invention also provides a supercritical water-cooled reactor, comprising:

[0024] Support plate;

[0025] core upper plate;

[0026] As described above, one end of the guide tube is connected to the support plate, and the other end is connected to the core upper plate or the top of the fuel assembly.

[0027] The positive and progressive effects of the present invention are:

[0028] The guide tube of the present invention has a guide plate and a matching tube arranged in the outer shell, so that the control rod can slide along the matching tube, so that the coolant entering or flowing out of the fuel assembly will not generate excessive load on the control rod when flowing out of or into the upper chamber. Compared with the traditional guide tube, the continuous guide section is eliminated, the structure is simpler, more space-saving and convenient to manufacture, which can not only meet the needs of guiding the control rod, but also provide a channel for the circulation of the coolant. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0030] Figure 1 It is a structural schematic diagram of the guide cylinder of the present invention;

[0031] Figure 2 for Figure 1 a cross-sectional view at an angle of

[0032] Figure 3 for Figure 1 A schematic diagram of the structure of the shell in FIG.

[0033] Figure 4 for Figure 2 A schematic diagram of the structure of the middle guide plate;

[0034] Figure 5 for Figure 2 Schematic diagram of the structure of the middle cover;

[0035] Figure 6 for Figure 2 Schematic diagram of the structure of the middle matching tube;

[0036] Figure 7 for Figure 2 A schematic structural diagram of another embodiment of the middle cover plate;

[0037] Figure 8 for Figure 1 A schematic structural diagram of another embodiment of a housing.

[0038] 1. Shell; 11. Accommodating cavity; 12. Mounting flange; 13. Cover plate; 131. Matching hole; 14. Splicing unit; 15. Second mounting hole; 16. Flow hole;

[0039] 2. Support plate;

[0040] 3. Reactor core upper plate;

[0041] 4. guide plate; 41. first mounting hole; 42. avoidance hole;

[0042] 5. Matching pipe. DETAILED DESCRIPTION

[0043] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0045] Please refer to Figures 1 to 8 The present invention proposes a supercritical water-cooled reactor, which includes a support plate 2, a core upper plate 3 and at least one guide cylinder, one end of the guide cylinder is connected to the support plate 2, and the other end is connected to the core upper plate 3 or the top of the fuel assembly, and the top of the support plate 2 is a top cover space.

[0046] There are two types of guide tubes, and correspondingly, there are two types of fuel assemblies. The first type of guide tube receives the coolant introduced from the inlet pipe of the stack, heats it along the first type of fuel assembly and guides it downward to the lower chamber, and then the coolant is heated upward from the lower chamber through the second type of fuel assembly, flows through the discharge port of the second type of guide tube to the outlet hot chamber, and finally discharged to the outside of the stack through the outlet pipe.

[0047] One end of the guide cylinder may be sleeved with the fuel assembly, or may be connected to the core upper plate 3 through a flange.

[0048] Please refer to Figures 1 to 3 The guide cylinder includes an outer shell 1, and an accommodating cavity 11 is arranged in the outer shell 1. The top of the outer shell 1 is connected to the support plate 2, and the bottom of the outer shell 1 is connected to the core upper plate 3 or the fuel assembly. At least one flow hole 16 connected to the accommodating cavity 11 is opened at the bottom of the outer shell 1, and the coolant enters or flows out of the accommodating cavity 11 through the flow hole 16.

[0049] The housing 1 further includes at least one guide plate 4, which is disposed in the accommodating cavity 11 and extends axially along the housing 1. The guide plate 4 is provided with at least one first mounting hole 41 on the side facing the accommodating cavity 11. A matching tube 5 is passed through each first mounting hole 41, and a control rod is inserted into the matching tube 5.

[0050] The inner wall of the matching tube 5 is a smooth surface with low roughness, so as to provide a low-friction sliding channel for the control rod.

[0051] Please refer to Figure 2 The number of the guide plates 4 is at least two, and at least two guide plates 4 are arranged at intervals along the axial direction of the housing 1 .

[0052] The number of guide plates 4 can be adjusted according to actual needs, and can be two, four, six, etc., which is not limited here.

[0053] In one embodiment, one end of the guide plate 4 is welded to the inner wall of the housing 1. For example, the guide plate 4 is spot welded to the inner wall of the housing 1 along the circumference of the guide plate 4. The guide plate 4 supports and limits the matching tube 5 and the control rod.

[0054] The matching tube 5 is sleeved on the inner side of the guide plate 4, and the matching tube 5 and the guide plate 4 can also be connected by welding. For example, the matching tube 5 is welded to each guide plate 4, or the two ends of the matching tube 5 are respectively welded to the guide plates 4 arranged relative to the top and bottom. The specific welding method can be adjusted according to actual needs and is not limited here.

[0055] Please refer to Figure 4 The guide plate 4 is an annular plate, a avoidance hole 42 is opened in the middle of the guide plate 4, and the first mounting hole 41 is opened toward one side of the avoidance hole 42.

[0056] Specifically, the number of the first mounting holes 41 is at least two, and the at least two first mounting holes 41 are arranged at intervals around the circumference of the guide plate 4 .

[0057] Preferably, a plurality of first mounting holes 41 are arranged at circumferential intervals around the avoidance hole 42, and an opening on one side of the first mounting hole 41 is arranged to be connected to the avoidance hole 42, so that when the control rod moves in the matching tube 5 in the first mounting hole 41, the coolant can flow out through the opening side of the matching tube 5, thereby avoiding excessive obstruction of the coolant to the movement of the control rod.

[0058] by Figure 4 For example, the number of the first mounting holes 41 is 6, and the 6 first mounting holes 41 are evenly spaced around the circumference of the guide plate 4. In some other embodiments, the number of the first mounting holes 41 can also be 4, 6 or 8, which is not limited here.

[0059] Please refer to Figure 4 and Figure 6 The matching tube 5 is a C-shaped tube and the opening end of the matching tube 5 is in the same direction as the opening end of the first mounting hole 41 .

[0060] That is, the opening of the matching tube 5 is in the same direction as the opening of the first mounting hole 41 , which is more conducive to quickly discharging the coolant in the matching tube 5 when the control rod moves up and down.

[0061] The purpose of setting both the matching tube 5 and the first mounting hole 41 to be open is to meet the control rod resistance characteristics and rod drop time requirements.

[0062] Please refer to Figure 1 , Figure 5 , Figure 7 as well as Figure 8 A mounting flange 12 is provided on the top of the housing 1, and a cover plate 13 is detachably connected to the outer side of the mounting flange 12; the bottom of the mounting flange 12 abuts against the top surface of the support plate 2, and a matching hole 131 is opened on the cover plate 13, which is connected to the top space of the support plate 2 and the accommodating cavity 11.

[0063] Specifically, the mounting flange 12 and the cover plate 13 are detachably connected via at least two threaded connectors.

[0064] Figure 1 and Figure 5 In the embodiment, the cover plate 13 is in the shape of a circular plate and is connected to the mounting flange 12 via six threaded connectors. Here, six threaded connectors are taken as an example for description, and the specific number of the threaded connectors is not limited.

[0065] The top of the housing 1 is suspended on the support plate 2 via the mounting flange 12 , for example, by screws passing through the cover plate 13 , the mounting flange 12 and the support plate 2 in sequence.

[0066] In some other embodiments, reference may be made to Figure 7 and Figure 8 The cover plate 13 may also be in other plate shapes, or may be connected to the mounting flange 12 via two threaded connectors. The specific shape of the cover plate 13 is not limited herein.

[0067] Please continue to refer to Figure 1 The number of the flow holes 16 is at least two, and at least two flow holes 16 are arranged at intervals around the circumference of the housing 1.

[0068] The flow hole 16 is described here by taking a long hole as an example, but the specific shape of the flow hole 16 can also be circular, square or other shapes, which is not limited here.

[0069] Figure 1 and Figure 8 In the description, six flow holes 16 are taken as an example. The six flow holes 16 are evenly spaced around the circumference of the housing 1 , thereby improving the uniformity of the coolant flowing into the accommodating cavity 11 .

[0070] In some other optional implementations, the number of the flow holes 16 may also be four, eight, etc., which is not limited here.

[0071] Please continue to refer to Figure 1The housing 1 includes at least two splicing units 14 along its axial direction, and adjacent splicing units 14 are detachably connected via threaded connectors.

[0072] For example, the shell 1 can be formed by splicing two or more sections. If the shell 1 needs to pass through other partitions that separate flow channels, it can be divided into sections at the partitions and connected to the partitions with flanges to improve the overall installation stability of the shell 1.

[0073] Furthermore, the housing 1 is provided with at least one second mounting hole 15, which is connected to the accommodating cavity 11 and the outer side of the housing 1; the second mounting hole 15 is located in the middle of the housing 1. The second mounting hole 15 is provided to meet the flow distribution and resistance characteristics of the entire flow field.

[0074] In summary, in the guide cylinder of the present invention, a guide plate 4 and a matching tube 5 are arranged in the outer shell 1, so that the control rod can slide along the matching tube 5 with low friction, and the coolant entering or flowing out of the fuel assembly will not generate excessive load on the control rod when flowing out of or entering the upper chamber. Compared with the traditional guide cylinder, the continuous guide section is eliminated, the structure is simpler, more space-saving and convenient to manufacture, which can not only meet the needs of guiding the control rod, but also provide a channel for the circulation of the coolant.

[0075] The guide tube involved in the present invention is innovatively designed according to the structure inside the reactor and meets the layout and functional requirements of the supercritical water reactor.

[0076] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "install", "connect", "connect", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0077] The present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or multiple times in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0078] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0079] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A guide cylinder, characterized in that: include: A shell having a containing cavity therein, wherein the top of the shell is connected to the support plate, the bottom of the shell is connected to the upper plate of the core, and the bottom of the shell is provided with at least one flow hole communicating with the containing cavity, through which the coolant enters or flows out of the containing cavity; At least one guide plate is arranged in the accommodating cavity and extends axially along the shell. The guide plate is provided with at least one first mounting hole on a side facing the accommodating cavity. A matching tube is passed through each of the first mounting holes, and a control rod is inserted into the matching tube.

2. The guide cylinder according to claim 1, characterized in that: The number of the guide plates is at least two, and at least two guide plates are arranged at intervals along the axial direction of the housing.

3. The guide cylinder according to claim 2, characterized in that: One end of the guide plate is welded to the inner wall of the shell.

4. The guide cylinder according to claim 1, characterized in that: The opposite ends of the matching pipe are welded to the guide plate.

5. The guide cylinder according to claim 1, characterized in that: The guide plate is an annular plate, a avoidance hole is opened in the middle of the guide plate, and the first mounting hole is opened toward one side of the avoidance hole.

6. The guide cylinder according to claim 5, characterized in that: The matching tube is a C-shaped tube and the opening end of the matching tube is in the same direction as the opening end of the first mounting hole.

7. The guide cylinder according to claim 1, characterized in that: The top of the housing is provided with a mounting flange, and the outer side of the mounting flange is detachably connected with a cover plate; The bottom of the mounting flange abuts against the top surface of the support plate, and the cover plate is provided with a matching hole communicating with the top space of the support plate and the accommodating cavity.

8. The guide cylinder according to claim 7, characterized in that: The mounting flange and the cover plate are detachably connected via at least two threaded connectors.

9. The guide cylinder according to claim 1, characterized in that: The number of the first mounting holes is at least two, and at least two of the first mounting holes are arranged at intervals around the circumference of the guide plate.

10. The guide cylinder according to claim 1, characterized in that: The number of the flow holes is at least two, and at least two of the flow holes are arranged at intervals around the circumference of the housing.

11. The guide cylinder according to claim 1, characterized in that: The housing comprises at least two splicing units along its axial direction, and adjacent splicing units are detachably connected via threaded connectors.

12. The guide cylinder according to claim 1, characterized in that: The housing is also provided with at least one second mounting hole, the second mounting hole being in communication with the accommodating cavity and the outer side of the housing; The second mounting hole is located in the middle of the housing.

13. A supercritical water-cooled reactor, characterized in that: include: Support plate; core upper plate; The guide tube as described in any one of claims 1 to 12, wherein one end of the guide tube is connected to the support plate, and the other end is connected to the core upper plate or the top of the fuel assembly.

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