Reactor core unloading device of high-temperature gas cooled reactor

Abstract

The invention relates to the technical field of high-temperature gas cooled reactors, in particular to a high-temperature gas cooled reactor core unloading device, which comprises an unloading unit, an unloading unit and a control unit, and the anti-blocking unit comprises a dredging rod arranged in the material passing channel, and the dredging rod is used for extruding and loosening the fuel in the material passing channel. According to the reactor core discharging device of the high-temperature gas cooled reactor, the dredging rod is used for extruding a fuel ball blocked in the material passing channel, so that the fuel ball can move, when the fuel ball is blocked in the material passing channel, the fuel ball moves through extrusion of the dredging rod, at the moment, the blocked position can be dredged, separation of crushed balls and dust is achieved, and blocking is avoided; isolation of the fuel balls is achieved, and the discharging device can be disassembled and maintained.

Description

Technical Field

[0001] The invention relates to the technical field of high temperature gas-cooled reactors, and in particular to a core unloading device for high temperature gas-cooled reactors. Background Art

[0002] The fuel used in the pebble bed high temperature gas-cooled reactor is a spherical element with a diameter of 60 mm. The pebble bed high temperature gas-cooled reactor needs to continuously load and unload spherical fuel elements during the initial core loading, core transition cycle, reactor power operation and other stages. The pebble bed reactor needs to measure the burnup depth of each fuel ball to determine whether the fuel should be sent back to the core or discharged into the spent fuel storage tank.

[0003] At present, the core unloading device of the high-temperature reactor demonstration project is prone to blockage and cannot be isolated for maintenance. The blockage is caused by the accumulation of graphite dust, and the device is not equipped with a ball separation function; it cannot be isolated for maintenance, that is, it is impossible to isolate the fuel balls upstream of the unloading device, and dismantle the unloading device for maintenance. There is a risk that once the unloading device fails and cannot be repaired, the reactor will not be able to operate. Summary of the invention

[0004] In view of the above-mentioned problems existing in the existing high temperature gas-cooled reactor core unloading device, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a high-temperature gas-cooled reactor core unloading device, which aims to: clean and dredge the fuel blockage in the core unloading device, separate the broken balls and dust, avoid blockage, isolate the fuel balls, and be able to dismantle and repair the unloading device.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a high temperature gas-cooled reactor core unloading device, comprising:

[0007] a discharge unit, comprising a fuel passage through which the fuel passes; and

[0008] The anti-blocking unit comprises a dredging rod arranged inside the material transfer channel, and the dredging rod is used to squeeze and loosen the fuel inside the material transfer channel.

[0009] As a preferred solution of the high-temperature gas-cooled reactor core unloading device of the present invention, the unloading unit includes an outer shell and a support seat, the outer shell covers the outside of the support seat, and the space between the outer shell and the support seat is a material transfer channel.

[0010] As a preferred solution of the high temperature gas-cooled reactor core unloading device of the present invention, the material transfer channel includes a material storage space and a material transfer passage arranged at the bottom of the material storage space.

[0011] As a preferred solution of the high temperature gas-cooled reactor core unloading device of the present invention, the anti-blocking unit further includes an isolation plate arranged at the bottom of the storage space, and the isolation plate is used to separate the storage space.

[0012] As a preferred solution of the high temperature gas-cooled reactor core unloading device of the present invention, there are multiple material transfer passages, which are evenly distributed outside the material storage space.

[0013] As a preferred solution of the high-temperature gas-cooled reactor core unloading device described in the present invention, there are multiple dredging rods located at the material transfer passage, and the dredging rods are made of cylinders, and their ends can be extended and retracted to counteract the fuel in the material transfer passage.

[0014] As a preferred solution of the high temperature gas-cooled reactor core unloading device of the present invention, transition spaces are provided between the plurality of storage spaces and the material transfer passages, and the isolation plates are located at the transition spaces.

[0015] As a preferred solution of the high temperature gas-cooled reactor core unloading device of the present invention, the isolation plate is rotatably arranged in the transition space, which can close the transition space and separate the material transfer passage from the material storage space.

[0016] As a preferred solution of the high-temperature gas-cooled reactor core unloading device described in the present invention, a baffle is provided in the transition space, a gap between the baffle and the support seat is provided for a single fuel to pass through, and the end of the dredging rod is opposite to the gap between the baffle and the support seat.

[0017] As a preferred solution of the high temperature gas-cooled reactor core unloading device of the present invention, it is characterized in that: the top of the support seat is a grid plate, and the bottom of the grid plate is a slag passing space.

[0018] The beneficial effects of the present invention are as follows: the fuel balls blocked in the material transfer channel are squeezed by the dredging rod so that they can be displaced. When the fuel balls are blocked in the material transfer channel, the fuel balls are displaced by squeezing the dredging rod, and the blockage can be dredged at this time. At the same time, the dredging rod is extended to block the material transfer channel, which is convenient for dismantling and repairing the unloading device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1It is a schematic diagram of the overall structure of the core unloading device of a high temperature gas-cooled reactor of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the material transfer channel of the core unloading device of a high temperature gas-cooled reactor of the present invention. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0025] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0026] Example 1, reference Figure 1 , which is the first embodiment of the present invention, provides a high temperature gas-cooled reactor core unloading device, which includes an unloading unit 100 and an anti-blocking unit 200.

[0027] The unloading unit 100 includes a feed passage M for the fuel to pass through, and the spherical fuel is transported in the feed passage M for consumption by the high temperature gas-cooled reactor.

[0028] Among them, the anti-blocking unit 200 includes a clearing rod 201 arranged inside the feed channel M, and the clearing rod 201 is used to squeeze and loosen the fuel inside the feed channel M. The clearing rod 201 can be made of a cylinder or an electric telescopic rod, and its end can be telescopic. When the fuel ball in the feed channel M is blocked, the end of the clearing rod 201 can be telescoped to squeeze and push the fuel ball, so that the fuel ball moves, causing the blockage to be dislocated, thereby eliminating the blockage.

[0029] Furthermore, when the end of the dredging rod 201 is fully extended, the material passage M can be isolated, so that the fuel balls can no longer flow in the material passage M, which makes it convenient to dismantle and repair the unloading device.

[0030] Example 2, reference Figure 2 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the unloading unit 100 includes a shell 101 and a support seat 102, the shell 101 covers the outside of the support seat 102, and the space between the shell 101 and the support seat 102 is a material transfer channel M.

[0031] Furthermore, the feed passage M includes a storage space M-1 and a feed passage M-2 arranged at the bottom of the storage space M-1. After the fuel balls are added to the storage space M-1, they fall out from the bottom feed passage M-2. The storage space M-1 can hold multiple fuel balls, and the inner diameter of the feed passage M-2 can only allow a single fuel ball to pass continuously. The top of the outer shell 101 is open, and fuel balls can be added to the storage space M-1 through the opening.

[0032] Furthermore, a plurality of material transfer passages M-2 are provided and are evenly spaced outside the material storage space M-1. Preferably, four material transfer passages M-2 are provided to increase the unloading speed of the fuel balls.

[0033] Among them, there are multiple dredging rods 201, and they are located at the material transfer passage M-2. The dredging rods 201 are made of cylinders, and their ends can be extended and retracted to offset the fuel in the material transfer passage M-2.

[0034] Each material transfer channel M is provided with a dredging rod 201, and the dredging rod 201 works independently. When the corresponding material transfer channel M-2 is blocked and material cannot be discharged, the corresponding dredging rod 201 can be controlled to extend and retract to dredge the channel; that is, when the fuel ball in the material transfer channel M is blocked, the end of the dredging rod 201 is extended and retracted to squeeze and push the fuel ball, so that the fuel ball moves and the blocked part is dislocated, thereby eliminating the blockage and allowing smooth material discharge.

[0035] When all the material passages M-2 cannot be unloaded and the unblocking rod 201 cannot be unblocked, it can be determined that there is a blockage in the storage space M-1. When the storage space M-1 is blocked, multiple unblocking rods 201 can be extended to block multiple material passages M-2. At this time, the unloading device can be dismantled and repaired. During the dismantling and repair, when the blockage is eliminated, no fuel balls will be discharged from the material passage M-2. Only after the unloading device is installed and the unblocking rod 201 is controlled again to open the material passage M-2, the material can be passed again.

[0036] The remaining structures are the same as those of Example 1.

[0037] Example 3, reference Figure 2 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that the anti-blocking unit 200 also includes an isolation plate 202 arranged at the bottom of the storage space M-1, and the isolation plate 202 is used to partition the storage space M-1.

[0038] Furthermore, a transition space M-3 is provided between the plurality of storage spaces M-1 and the material transfer passage M-2, and the isolation plate 202 is located at the transition space M-3. The setting of the transition space M-3 can enable the fuel balls from the storage space M-1 to the filter passage to be reduced in multiple stages, thereby preventing the fuel balls in the storage space M-1 from entering the entrance of the material transfer passage M-2 at one time. The entrance of the material transfer passage M-2 is small and prone to blockage. The setting of the transition space M-3 can further reduce the occurrence of blockage.

[0039] Among them, the isolation plate 202 is rotatably set in the transition space M-3, and one end of it is rotatably connected to the inner wall of the shell, which can close the transition space M-3 and separate the material transfer passage M-2 from the material storage space M-1.

[0040] The isolation plate 202 is driven by a cylinder, and both ends of the cylinder are hingedly installed between the outer shell 101 and the isolation plate 202. The rotation of the isolation plate 202 can be controlled by extending and retracting the cylinder end. When the isolation plate 202 is rotated out, the transition space M-3 can be isolated from the storage space M-1, and the inner diameter of the transition space M-3 can allow multiple fuels to pass through at the same time.

[0041] Alternatively, the isolation plate 202 can be connected to the outer shell 101 through a spring, and a pull rope is also installed on the isolation plate 202. The pull rope can be used to pull the isolation plate 202 close to the outer shell 101 to open the channel of the transition space M-3, and the channel of the transition space M-3 can be closed by loosening the pull rope.

[0042] Each material transfer channel M is provided with a clearing rod 201. When the corresponding material transfer channel M-2 is blocked and material cannot be discharged, the corresponding clearing rod 201 can be controlled to extend and retract to clear the channel. That is, when the fuel ball in the material transfer channel M is blocked, the end of the clearing rod 201 is extended and retracted to squeeze and push the fuel ball, so that the fuel ball moves and the blocked part is dislocated, thereby eliminating the blockage and allowing smooth material discharge.

[0043] When all the material passages M-2 cannot be unloaded and the clearing rod 201 cannot be cleared, it can be determined that there is a blockage in the storage space M-1. When the storage space M-1 is blocked, multiple isolation plates 202 can be extended to block multiple transition spaces M-3. At this time, the unloading device can be dismantled and repaired. During the dismantling and repair, when the blockage is eliminated, no fuel balls will be discharged from the material passage M-2. Only after the unloading device is installed and the isolation plate 202 is controlled again to open the transition space M-3, the material can be passed again.

[0044] Furthermore, a baffle 203 is provided in the transition space M-3, and a gap between the baffle 203 and the support seat 102 is provided for a single fuel to pass through. The end of the dredging rod 201 is opposite to the gap between the baffle 203 and the support seat 102. The gap between the baffle 203 and the support seat 102 can effectively reduce the number of fuel balls that pass into the feed passage M-2 at the same time.

[0045] The dredging rod 201 is installed in the shell, and its end can pass through the material passage M-2 and the gap between the baffle 203 and the support seat 102. When the material passage M-2 is blocked, the dredging rod 201 is controlled to extend to dredge the material passage M-2, and at the same time, it can dredge the gap between the baffle 203 and the support seat 102, thereby increasing the dredging effect.

[0046] The remaining structure is the same as that of Example 2.

[0047] Example 4, reference Figure 2 , which is the fourth embodiment of the present invention. This embodiment is different from the third embodiment in that the top of the support seat 102 is a grid plate, and the bottom of the grid plate is a slag passing space N.

[0048] The channel between the top of the support seat 102 and the shell is the transition space M-3 and the storage space M-1. The multiple fuel balls in the transition space M-3 and the storage space M-1 will collide and rub against each other when moving, which will cause some fuel balls to break and powder to fall. It is easy to exist in the gaps between the remaining fuel balls, making the remaining fuel balls unable to move and more prone to blockage.

[0049] Furthermore, the top of the support seat 102 is a grid plate that can allow the fuel balls to pass through when they are broken. The broken fuel balls and powder pass through the top of the support seat 102, which can keep the material passage M-2 clean and prevent the fuel balls inside from being blocked by powder and debris.

[0050] The remaining structure is the same as that of Example 3.

[0051] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0052] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0053] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A core unloading device for a high temperature gas-cooled reactor, characterized in that: include, A discharge unit (100) comprising a material passage (M) for fuel to pass through; as well as, The anti-blocking unit (200) comprises a dredging rod (201) arranged inside a material transfer channel (M), wherein the dredging rod (201) is used to squeeze and loosen the fuel inside the material transfer channel (M).

2. The high temperature gas-cooled reactor core unloading device according to claim 1, characterized in that: The unloading unit (100) comprises an outer shell (101) and a support seat (102); the outer shell (101) covers the outside of the support seat (102); and the space between the outer shell (101) and the support seat (102) is a material transfer channel (M).

3. The high temperature gas-cooled reactor core unloading device according to claim 2, characterized in that: The material transfer channel (M) comprises a material storage space (M-1) and a material transfer passage (M-2) arranged at the bottom of the material storage space (M-1).

4. The high temperature gas-cooled reactor core unloading device according to claim 3, characterized in that: The anti-blocking unit (200) further comprises an isolation plate (202) arranged at the bottom of the material storage space (M-1), and the isolation plate (202) is used to separate the material storage space (M-1).

5. The high temperature gas-cooled reactor core unloading device according to claim 4, characterized in that: The material transfer passages (M-2) are provided in plurality and are evenly distributed outside the material storage space (M-1).

6. The high temperature gas-cooled reactor core unloading device according to claim 4 or 5, characterized in that: The dredging rods (201) are provided in plurality and are located at the material transfer passage (M-2). The dredging rods (201) are made of a cylinder, and their ends can be extended and retracted to abut against the fuel in the material transfer passage (M-2).

7. The high temperature gas-cooled reactor core unloading device according to claim 6, characterized in that: A transition space (M-3) is provided between each of the plurality of material storage spaces (M-1) and the material transfer passage (M-2), and the isolation plate (202) is located at the transition space (M-3).

8. The high temperature gas-cooled reactor core unloading device according to claim 7, characterized in that: The isolation plate (202) is rotatably disposed in the transition space (M-3), and is capable of closing the transition space (M-3) and separating the material transfer passage (M-2) from the material storage space (M-1).

9. The high temperature gas-cooled reactor core unloading device according to claim 8, characterized in that: A baffle (203) is provided in the transition space (M-3), a gap between the baffle (203) and the support seat (102) is provided for a single fuel to pass through, and an end of the dredging rod (201) is opposite to the gap between the baffle (203) and the support seat (102).

10. The high temperature gas-cooled reactor core unloading device according to any one of claims 3-5 and 7-9, characterized in that: The top of the support seat (102) is a grid plate, and the bottom of the grid plate is a slag passing space (N).

Images