Fuel ball discharge device for pebble bed reactor and reactor

Abstract

The application discloses a kind of ball bed reactor fuel ball discharging device and reactor, the ball bed reactor fuel ball discharging device includes discharge pipe and driving piece, discharge pipe is connected at the discharge port of reactor bottom, discharge pipe has the pipeline that allows fuel ball to move, and pipeline includes the stop segment that can be tightened and released in the radial direction of pipeline, when stop segment is tightened, fuel ball can be clamped to prevent it from falling along discharge pipe, when stop segment is released, fuel ball can be released to allow it to fall along discharge pipe, driving piece can drive stop segment to be tightened or released.The ball bed reactor fuel ball discharging device of the application can realize on-demand discharge, and in the process of fuel ball discharge, the remaining fuel ball of reactor can continue to carry out nuclear reaction, realize non-stop reactor refueling, improve the working efficiency of nuclear reactor.

Description

Technical Field

[0001] This invention relates to the field of nuclear reactor technology, specifically to a pebble bed reactor fuel pellet unloading device and reactor. Background Technology

[0002] A pebble bed reactor is an advanced nuclear reactor design in which fuel spheres are placed inside the reactor and coolants such as helium, nitrogen, or carbon dioxide pass between the fuel spheres to remove the heat generated by the reaction. This allows the coolant to act as a high-temperature gas to drive the turbine.

[0003] In related technologies, during periodic fuel ball replacement, new fuel balls enter from the top of the reactor, while waste fuel balls flow out through the lower unloading pipe, replacing all fuel balls at once. At this time, the nuclear reactor stops working, reducing the operating efficiency of the nuclear reactor. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a pebble bed reactor fuel sphere unloading device in view of the defects and deficiencies of the prior art. The pebble bed reactor fuel sphere unloading device can realize unloading on demand, and during the process of unloading fuel spheres, the remaining fuel spheres in the reactor can continue to carry out nuclear reaction, realizing non-stop refueling and improving the working efficiency of nuclear reactor.

[0005] An embodiment of the present invention also proposes a reactor.

[0006] The pebble bed reactor fuel sphere unloading device of this invention includes: an unloading pipe connected to the unloading port at the bottom of the reactor, the unloading pipe having a channel that allows the fuel spheres to move, and the channel including a stop section that can be tightened and released radially, the stop section tightening to clamp the fuel spheres to prevent them from falling along the unloading pipe, and the stop section releasing to release the fuel spheres to allow them to fall along the unloading pipe; and a drive member that can drive the stop section to tighten or release.

[0007] According to an embodiment of the present invention, a pebble bed reactor fuel sphere unloading device includes an unloading pipe connected to the unloading port at the bottom of the reactor. The unloading pipe has a conduit that allows the fuel spheres to move, and includes a stop section that can be tightened and released radially. When the stop section is tightened, it can clamp the fuel spheres to prevent them from falling along the unloading pipe; when the stop section is released, it can release the fuel spheres to allow them to fall along the unloading pipe. A drive unit can drive the stop section to tighten or release. Thus, when the drive unit controls the stop section to tighten, the unloading pipe radially contracts, thereby clamping any unloaded fuel spheres, achieving... The "closing" of the unloading pipe is achieved when the drive unit releases the stop section, causing the unloading pipe to expand radially and allowing the fuel balls to be unloaded normally. This "opening" of the unloading pipe allows the fuel ball unloading device of the pebble bed reactor in this application to control the flow state of the fuel balls by changing the inner diameter of the unloading pipe. When the unloading pipe contracts and expands radially in a regular manner, the fuel balls can be unloaded intermittently, achieving unloading on demand. Furthermore, this application allows the remaining fuel balls to continue nuclear reaction while the reactor is unloading, achieving non-stop refueling and improving the operating efficiency of the nuclear reactor.

[0008] In addition, the pebble bed reactor fuel pellet unloading device of this application has a simple structure, is easy to install, and has good applicability.

[0009] In some embodiments, the discharge pipe further includes a guide section, which is a rigid pipe, and the stop section is an elastic element connected to the guide section.

[0010] In some embodiments, the stop segment is connected to the end of the guide segment away from the discharge port.

[0011] In some embodiments, the discharge pipe includes an inner pipe and an outer pipe spaced apart outside the inner pipe, the inner pipe communicating with the discharge port, and the inner pipe having the stop section.

[0012] In some embodiments, the driving component is a pneumatic component, and the unloading pipe further includes a base plate. The base plate is connected between the inner pipe and the outer pipe and is located at the bottom of the inner pipe and the outer pipe. The base plate, the inner pipe and the outer pipe can form an inflation chamber, and at least one of the base plate and the outer pipe is provided with an inflation port communicating with the inflation chamber. The pneumatic component communicates with the inflation port to inflate or draw air into the inflation chamber.

[0013] In some embodiments, the inflation port is located on the outer tube and is opposite to the stop section.

[0014] In some embodiments, the elastic element is an elastic diaphragm and / or a bellows.

[0015] In some embodiments, the pebble bed reactor fuel pellet unloading device further includes a pellet counter, which is connected to the drive unit and can control the number of pellets unloaded by controlling the locking and releasing of the drive unit's drive stop section.

[0016] The reactor of this invention includes a pebble bed reactor fuel pellet unloading device as described in the above embodiments.

[0017] According to the embodiments of the present invention, by employing the pebble bed reactor fuel pellet unloading device of the above embodiments, the nuclear reactor operates with high efficiency and good safety.

[0018] In some embodiments, the bottom of the reactor is provided with a plurality of spaced-apart discharge ports, and the plurality of discharge ports are respectively provided with a plurality of pebble bed reactor fuel sphere unloading devices. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a pebble bed reactor fuel pellets unloading device according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of a pebble bed reactor fuel pellet unloading device according to another embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the series structure of the pebble bed reactor fuel pellet unloading device according to an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the series structure of a pebble bed reactor fuel pellet unloading device according to another embodiment of the present invention.

[0023] Figure label:

[0024] Discharge pipe 1, stop section 11, elastic diaphragm 111, bellows 112, guide section 12, inner pipe 13, outer pipe 14, base plate 15, gas inlet 16, reactor 2. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] like Figure 1-4 As shown, the pebble bed reactor fuel pellet unloading device of this embodiment includes an unloading pipe 1 and a drive unit (not shown).

[0027] Specifically, the discharge pipe 1 is connected to the discharge port at the bottom of the reactor 2. The discharge pipe 1 has a pipe that allows the fuel ball to move, and the pipe includes a stop section 11 that can be tightened and released in the radial direction of the pipe. When the stop section 11 is tightened, it can clamp the fuel ball to prevent it from falling along the discharge pipe 1. When the stop section 11 is released, it can release the fuel ball to allow it to fall along the discharge pipe 1. A drive can drive the stop section 11 to tighten or release.

[0028] In other words, the driving component can change the operating state of the stop section 11. When the driving component controls the stop section 11 to tighten, the unloading pipe 1 contracts radially, thereby clamping the unloaded fuel balls and preventing the fuel balls from being unloaded further, thus achieving the "closure" of the unloading pipe 1. When the driving component controls the stop section 11 to release, the unloading pipe 1 expands radially, thereby restoring the unloading pipe 1 to its original state, and the fuel balls can be unloaded normally, thus achieving the "opening" of the unloading pipe 1. Thus, the pebble bed reactor fuel ball unloading device of this application can control the timing of the tightening and releasing of the stop section 11 through the driving component, thereby allowing the unloading pipe 1 to contract and expand radially in a regular manner, and the fuel balls can be unloaded intermittently until the unloaded quantity meets the requirements, achieving unloading on demand. At the same time as unloading, the remaining fuel balls in the reactor 2 can continue to carry out nuclear reactions, achieving non-stop refueling, avoiding the drawback of the nuclear reactor stopping operation during unloading in traditional technologies, and improving the working efficiency of the nuclear reactor.

[0029] Understandably, compared to the traditional method of opening the discharge port by flipping the cover, this application uses the radial contraction and expansion of the discharge pipe 1 to control the flow state of the discharge pipe 1. This method of discharging fuel balls is more "gentle" and can avoid sparks generated by the fuel balls colliding with the wall of the discharge pipe 1 or the flip cover, thereby improving the explosion-proof safety performance of the reactor 2.

[0030] According to an embodiment of the present invention, a pebble bed reactor fuel sphere unloading device includes an unloading pipe connected to the unloading port at the bottom of the reactor. The unloading pipe has a conduit that allows the fuel spheres to move, and includes a stop section that can be tightened and released radially. When the stop section is tightened, it can clamp the fuel spheres to prevent them from falling along the unloading pipe; when the stop section is released, it can release the fuel spheres to allow them to fall along the unloading pipe. A drive unit can drive the stop section to tighten or release. Thus, when the drive unit controls the stop section to tighten, the unloading pipe radially contracts, thereby clamping any unloaded fuel spheres, achieving... The "closing" of the unloading pipe is achieved when the drive unit releases the stop section, causing the unloading pipe to expand radially and allowing the fuel balls to be unloaded normally. This "opening" of the unloading pipe allows the fuel ball unloading device of the pebble bed reactor in this application to control the flow state of the fuel balls by changing the inner diameter of the unloading pipe. When the unloading pipe contracts and expands radially in a regular manner, the fuel balls can be unloaded intermittently, achieving unloading on demand. Furthermore, this application allows the remaining fuel balls to continue nuclear reaction while the reactor is unloading, achieving non-stop refueling and improving the operating efficiency of the nuclear reactor.

[0031] In addition, the pebble bed reactor fuel pellet unloading device of this application has a simple structure, is easy to install, and has good applicability.

[0032] Furthermore, such as Figure 1-4 As shown, the unloading pipe 1 also includes a guide section 12, which is a rigid pipe, and a stop section 11 is an elastic element connected to the guide section 12.

[0033] In other words, the unloading pipe 1 of this application can be composed of a rigid guide section 12 and an elastic stop section 11 connected to each other. The rigid guide section 12 can increase the structural strength of the unloading pipe 1, prevent deformation caused by the collision of fuel balls, and improve the durability of the unloading pipe 1. The elastic stop section 11 can change the inner diameter of the unloading pipe 1 by the pop-out and return of the elastic element, thereby controlling the communication state of the unloading pipe 1. This setting method has a simple structure and is easy to operate.

[0034] Furthermore, such as Figure 1-4 As shown, the stop section 11 is connected to the end of the guide section 12 away from the unloading port, that is, the stop section 11 is located at the outlet end of the unloading pipe 1. This makes it convenient for the staff to observe whether the fuel balls are clamped at the outlet end of the unloading pipe 1, so as to prevent all the remaining fuel balls in the reactor 2 from flowing out and the nuclear reactor from stopping operation.

[0035] Optionally, multiple stop sections 11 can be connected in series at the outlet end of the unloading pipe 1, thereby further improving the reliability of the unloading pipe 1 in clamping the fuel ball.

[0036] Furthermore, such as Figure 1-4 As shown, the unloading pipe 1 includes an inner pipe 13 and an outer pipe 14 spaced out on the outside of the inner pipe 13. The inner pipe 13 is connected to the unloading port and has a stop section 11. The outer pipe 14 can protect the inner pipe 13 and improve the durability of the unloading pipe 1.

[0037] Furthermore, such as Figure 1-4 As shown, the driving component is a pneumatic component, and the unloading pipe 1 also includes a base plate 15. The base plate 15 is connected between the inner pipe 13 and the outer pipe 14 and is located at the bottom of the inner pipe 13 and the outer pipe 14. The base plate 15, the inner pipe 13 and the outer pipe 14 can form an inflation chamber, and at least one of the base plate 15 and the outer pipe 14 is provided with an inflation port 16 that communicates with the inflation chamber. The pneumatic component communicates with the inflation port 16 to inflate or draw air into the inflation chamber.

[0038] Understandably, when the pneumatic component fills the inflation chamber with gas through the inflation port 16, the increase in gas in the inflation chamber causes the stop section 11 to bulge into the pipe, thereby reducing the inner diameter of the stop section 11 and clamping the fuel ball with the discharge pipe 1. Conversely, when the pneumatic component draws gas out of the inflation chamber through the inflation port 16, the decrease in gas in the inflation chamber causes the stop section 11 to return to its original state, and the discharge pipe 1 can release the fuel ball.

[0039] Furthermore, such as Figure 1-4 As shown, the air inlet 16 is located on the outer tube 14 and is opposite to the stop section 11.

[0040] It is understandable that when gas is input through the inflation port 16, the gas added in the inflation chamber can directly act on the stop section 11 opposite to the inflation port 16, thereby achieving rapid tightening of the stop section 11. Conversely, when the gas in the inflation chamber is discharged from the inflation port 16, the stop section 11 can be quickly released, thereby improving the control efficiency of the device.

[0041] Furthermore, such as Figure 1-4 As shown, the elastic element is an elastic membrane 111 and / or a bellows 112.

[0042] It is understandable that the elastic diaphragm 111 or the bellows 112 can be easily deformed under the action of gas, and the elastic diaphragm 111 or the bellows 112 is easy to obtain and install, which improves the applicability of this device.

[0043] Furthermore, such as Figure 1-4 As shown, the pebble bed reactor fuel pellet unloading device also includes a pellet counter (not shown), which is connected to the drive unit. The pellet counter can control the number of pellets unloaded by controlling the tightening and releasing of the stop section 11 driven by the drive unit.

[0044] In other words, the pebble bed reactor fuel pellet unloading device of this application can detect the number of fuel pellets unloaded by a pellet counter. When the pellet counter starts counting, it transmits an open signal to the drive unit, which then controls the stop section 11 to release, and the fuel pellets begin to be unloaded. When the number of fuel pellets unloaded meets the requirements, the pellet counter transmits an close signal to the drive unit, which then controls the stop section 11 to tighten, and the fuel pellets stop being unloaded. This achieves automated control of the nuclear reactor fuel pellet unloading process and improves the operating efficiency of the nuclear reactor.

[0045] The reactor of this invention includes a pebble bed reactor fuel pellet unloading device according to the above embodiments.

[0046] According to the embodiments of the present invention, by employing the pebble bed reactor fuel pellet unloading device of the above embodiments, the nuclear reactor operates with high efficiency and good safety.

[0047] Furthermore, such as Figure 1-4 As shown, reactor 2 has multiple spaced discharge ports at its bottom, and multiple pebble bed reactor fuel ball unloading devices are installed at the multiple discharge ports. This allows for control of fuel ball unloading in different areas at the bottom of reactor 2, thereby ensuring that the fuel ball core height in reactor 2 remains consistent, achieving uniform flow resistance within the core, improving coolant flow efficiency, and accelerating the operating efficiency of the nuclear reactor.

[0048] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pebble bed reactor fuel pellet unloading device, characterized in that, include: The discharge pipe is connected to the discharge port at the bottom of the reactor. The discharge pipe has a conduit that allows the movement of fuel balls, and includes a radially retractable stop section. When the stop section is retracted, it clamps the fuel balls to prevent them from falling along the discharge pipe; when the stop section is released, it releases the fuel balls to allow them to fall along the discharge pipe. The discharge pipe also includes a guide section, which is a rigid tube, and the stop section is an elastic element connected to the guide section. A driving element that can drive the stop segment to tighten or release; The discharge pipe includes an inner pipe and an outer pipe spaced outside the inner pipe. The inner pipe is connected to the discharge port and has the stop section. The driving component is a pneumatic component. The discharge pipe also includes a base plate. The base plate is connected between the inner pipe and the outer pipe and is located at the bottom of the inner pipe and the outer pipe. The base plate, the inner pipe and the outer pipe can form an inflation chamber. At least one of the base plate and the outer pipe is provided with an inflation port that communicates with the inflation chamber. The pneumatic component communicates with the inflation port to inflate or draw air into the inflation chamber.

2. The pebble bed reactor fuel pellet unloading device according to claim 1, characterized in that, The stop section is connected to the end of the guide section away from the discharge port.

3. The pebble bed reactor fuel pellet unloading device according to claim 1, characterized in that, The inflation port is located on the outer tube and is opposite to the elastic element.

4. The pebble bed reactor fuel pellet unloading device according to claim 3, characterized in that, The elastic element is an elastic diaphragm and / or a bellows.

5. The pebble bed reactor fuel pellet unloading device according to claim 1, characterized in that, It also includes a ball counter, which is connected to the drive unit. The ball counter can control the number of balls unloaded by controlling the locking and releasing of the stop section driven by the drive unit.

6. A reactor, characterized in that, Includes a pebble bed reactor fuel pellet unloading device according to any one of claims 1-5.

7. The reactor according to claim 6, characterized in that, The reactor has multiple spaced discharge ports at its bottom, and multiple pebble bed reactor fuel sphere unloading devices are provided for each discharge port.

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