High-temperature gas cooled reactor fuel loading and unloading system and method for preventing fuel counter from counting omission

Abstract

The invention provides a high-temperature gas cooled reactor fuel loading and unloading system and a method for preventing a fuel counter from metering omission, and belongs to the technical field of nuclear power equipment.The high-temperature gas cooled reactor fuel loading and unloading system comprises a ball falling pipeline, an electromagnetic accelerator and the fuel counter; the electromagnetic accelerator is arranged on the downward extending section of the ball falling pipeline; the fuel counter is arranged on the ball falling pipeline and located below the electromagnetic accelerator, and the fuel counter calculates the passing number of the fuel balls through detection; according to the fuel loading and unloading system for the high-temperature gas cooled reactor, the electromagnetic accelerator is additionally arranged on the ball falling pipeline, so that when the fuel balls pass through the acceleration coil of the electromagnetic accelerator, the acceleration coil accelerates the fuel balls, and the speed of the fuel balls is increased within a limited distance; therefore, the fuel balls generate large electromotive force when cutting the induction coil of the fuel counter, the electromotive force can be detected more easily, the problem that the fuel balls are missed in the ball passing process is solved, and the running reliability of a system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power equipment, and particularly relates to a fuel handling system for a high-temperature gas-cooled reactor and a method for preventing a fuel counter from missing counts. Background Art

[0002] During the operation of the fuel handling system of a high-temperature gas-cooled reactor, fuel balls are discharged through a discharging device. Through free-fall motion, they acquire a certain speed and then pass through a fuel counter. When the fuel balls pass through the magnetic induction coil of the fuel counter, an electromotive force (E = υBScosφ) is generated. The fuel counter completes counting through detection.

[0003] However, due to limited installation space, the distance between the discharging device and the fuel counter is relatively close. Some fuel balls do not fall in free-fall motion but collide with the pipe wall and roll during falling, resulting in a lower speed when the fuel balls reach the fuel counter. This will cause a smaller electromotive force (E = υBScosφ) to be generated when some fuel balls pass through the magnetic induction coil of the fuel counter, and the waveform does not meet the expectation, so they are missed during the detection and counting by the fuel counter. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the fuel counter in the fuel handling system of the existing high-temperature gas-cooled reactor misses counts of fuel balls, so as to provide a fuel handling system for a high-temperature gas-cooled reactor and a method for preventing a fuel counter from missing counts.

[0005] To solve the above technical problem, the present invention provides a fuel handling system for a high-temperature gas-cooled reactor, including:

[0006] A ball-drop pipe having a downward extension section;

[0007] An electromagnetic accelerator disposed on the downward extension section of the ball-drop pipe, and the electromagnetic accelerator accelerates the fuel balls in the ball-drop pipe through an acceleration coil;

[0008] A fuel counter disposed on the ball-drop pipe and below the electromagnetic accelerator, and the fuel counter calculates the number of fuel balls passing through through detection.

[0009] Optionally, a plurality of the electromagnetic accelerators are sequentially disposed on the downward extension section of the same ball-drop pipe.

[0010] Optionally, a stop valve is provided upstream of the electromagnetic accelerator on the ball-drop pipe.

[0011] Optionally, at least two of the stop valves are sequentially disposed.

[0012] Optionally, the stop valve is a solenoid valve.

[0013] Optionally, the ball dropping pipe is arranged below the unloading device.

[0014] Optionally, there are multiple ball dropping pipes arranged below the unloading device.

[0015] Optionally, the electromagnetic accelerator includes an insulating pipe and accelerating coils wound around the insulating pipe, and both ends of the insulating pipe are respectively provided with connection structures for connecting with the ball dropping pipe.

[0016] The present invention provides a method for preventing the fuel counter from missing counts, including the following steps: during the free-fall movement of the fuel balls in the ball dropping pipe, they are first accelerated at least once by the electromagnetic accelerator, and then detected and counted by the fuel counter.

[0017] Optionally, the fuel balls are accelerated twice by the electromagnetic accelerator in the downward extending section of the ball dropping pipe.

[0018] The technical solution of the present invention has the following advantages:

[0019] 1. For the high-temperature gas-cooled reactor fuel handling system provided by the present invention, by adding an electromagnetic accelerator to the ball dropping pipe, when the fuel balls pass through the accelerating coils of the electromagnetic accelerator, the accelerating coils accelerate the fuel balls, so that the fuel balls increase their speed within a limited distance, and a larger electromotive force is generated when the fuel balls cut the induction coil of the fuel counter, making them more easily detected, thereby preventing the problem of fuel balls being missed during passing through the counter and improving the reliability of the system operation.

[0020] 2. For the method for preventing the fuel counter from missing counts provided by the present invention, the electromagnetic accelerator accelerates the moving speed of the fuel balls in the ball dropping pipe, so that the fuel balls increase their speed within a limited distance, and a larger electromotive force is generated when the fuel balls cut the induction coil of the fuel counter, making them more easily detected, thereby preventing the problem of fuel balls being missed during passing through the counter and improving the reliability of the system operation. Description of the Drawings

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is the front view of a specific embodiment of the high-temperature gas-cooled reactor fuel handling system provided in the embodiment of the present invention.

[0023] Description of the Reference Numerals:

[0024] 1. Ball dropping pipe; 2. Electromagnetic accelerator; 3. Fuel counter; 4. Check valve; 5. Discharging device. Specific embodiments

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] As Figure 1 shown, a specific embodiment of the fuel loading and unloading system of the high-temperature gas-cooled reactor provided in this embodiment includes: a ball dropping pipe 1, an electromagnetic accelerator 2, and a fuel counter 3. The ball dropping pipe 1 has a downward extension section, the electromagnetic accelerator 2 is arranged on the downward extension section of the ball dropping pipe 1, and the electromagnetic accelerator 2 accelerates the fuel balls in the ball dropping pipe 1 through an acceleration coil; specifically, using the principle that a metal ball can obtain power under the action of a magnetic field, the fuel balls are accelerated when passing through the acceleration coil. The fuel counter 3 is arranged on the ball dropping pipe 1 and is located below the electromagnetic accelerator 2, and the fuel counter 3 calculates the number of fuel balls passing through by detection.

[0030] The fuel handling system of the high-temperature gas-cooled reactor provided in this embodiment can accelerate the fuel balls when they pass through the acceleration coils of the electromagnetic accelerator 2 by adding the electromagnetic accelerator 2 to the ball-drop pipe. As a result, the fuel balls can increase their speeds within a limited distance, generating a larger electromotive force when cutting the induction coil of the fuel counter 3, making them more easily detected, thus preventing the problem of missed counting when the fuel balls pass through the counter and improving the reliability of the system operation.

[0031] As Figure 1 shown, in the fuel handling system of the high-temperature gas-cooled reactor provided in this embodiment, two electromagnetic accelerators 2 are sequentially arranged on the downward extension section of the same ball-drop pipe 1. With this arrangement, multi-stage acceleration is achieved, and the fuel balls can be successively accelerated by the two electromagnetic accelerators 2 in the ball-drop pipe 1, thereby further increasing the speed of the fuel balls. In addition, the electromagnetic accelerators at different positions can finely adjust the acceleration process of the fuel balls according to actual requirements. For example, the acceleration parameters (such as current magnitude, magnetic field strength, etc.) of each electromagnetic accelerator can be flexibly adjusted based on factors such as the initial speed of the fuel balls, the length and bending degree of the ball-drop pipe, and the requirements of the counter for the speed of the fuel balls, to achieve precise control of the speed of the fuel balls and meet the operation requirements of the high-temperature gas-cooled reactor under different working conditions.

[0032] By setting the above-mentioned multiple electromagnetic accelerators, this embodiment provides a certain degree of redundancy. If one of the electromagnetic accelerators fails, the other electromagnetic accelerators can still continue to work, maintaining the acceleration process of the fuel balls to a certain extent and ensuring that the fuel handling system will not be completely paralyzed due to a single equipment failure, thus improving the reliability and stability of the entire system operation.

[0033] Of course, the above description is not restrictive. In some alternative embodiments, only one electromagnetic accelerator 2 can be provided, or more can be provided, etc. As Figure 1As shown, in the high-temperature gas-cooled reactor fuel loading and unloading system provided by this embodiment, a stop valve 4 is provided on the ball-dropping pipeline 1 upstream of the electromagnetic accelerator 2. By setting the stop valve 4, when the system needs it, it can be used to prevent the passage of fuel balls. Specifically, in this embodiment, the stop valve 4 has two stop valves 4 arranged in sequence; by setting the two stop valves 4, the safety of the system operation can be improved, forming a double insurance mechanism. When it is necessary to stop the delivery of fuel balls, the two stop valves can more reliably block the falling path of the fuel balls, prevent the accidental passage of the fuel balls due to the poor sealing or failure of a single stop valve, effectively avoid the fuel balls from entering the electromagnetic accelerator and subsequent pipelines under unexpected circumstances, and improve the safety of the entire fuel loading and unloading system. In addition, the two stop valves arranged in sequence can achieve more accurate flow regulation. By controlling the opening of the two stop valves respectively, the number and speed of the fuel balls entering the electromagnetic accelerator can be more delicately adjusted. For example, during the system startup or shutdown phase, and when the fuel ball flow needs to be fine-tuned, the coordinated operation of the two stop valves can provide more flexible and precise control than a single stop valve, which helps to optimize the stability and controllability of the high-temperature gas-cooled reactor fuel loading and unloading process. When one of the stop valves fails and needs to be repaired or replaced, the other stop valve can continue to play a blocking role to maintain the basic safety state of the system. This allows maintenance personnel to handle the faulty stop valve without affecting the safety of the entire system, improves the maintainability of the system, and reduces system downtime caused by equipment maintenance. Specifically, in this embodiment, the stop valve 4 can be a solenoid valve; this facilitates remote control.

[0034] Of course, the above description is not restrictive. In some alternative embodiments, the stop valve 4 may be provided with only one or more valves. The stop valve 4 may not be a solenoid valve, for example, a valve driven and controlled by a servo motor or a manual valve may be used.

[0035] like Figure 1 As shown, in the high-temperature gas-cooled reactor fuel loading and unloading system provided in this embodiment, the ball-dropping pipe 1 is arranged below the unloading device 5. With such an arrangement, when the fuel balls in the unloading device 5 are discharged, the fuel balls discharged by the unloading device can directly fall into the ball-dropping pipe by their own gravity. This natural gravity conveying method does not require an additional mechanical pushing device, greatly simplifies the transfer process of the fuel balls from the unloading device to the ball-dropping pipe, and reduces the complexity and energy consumption of the system. This vertical layout method makes full use of the space, so that the unloading device and the ball-dropping pipe form an orderly upper and lower structure in space, reducing the floor space. For places such as high-temperature gas-cooled reactors with limited space and dense equipment, the compact layout is conducive to the rational arrangement of other equipment and improves the site utilization rate.

[0036] like Figure 1As shown in the figure, in this embodiment, there are multiple ball-drop pipes 1 disposed below the discharging device 5. The multiple ball-drop pipes disposed below the discharging device can simultaneously receive the fuel balls discharged by the discharging device, which is equivalent to broadening the "channel" for discharging. This enables the discharging device to discharge more fuel balls per unit time, greatly improving the discharging efficiency, meeting the requirement of rapid transfer of fuel balls during the discharging process of the high-temperature gas-cooled reactor, reducing the discharging time, and improving the overall operation efficiency of the reactor. In addition, the multiple ball-drop pipes share the fuel balls discharged by the discharging device, avoiding problems such as blockage and increased wear that may occur in a single ball-drop pipe due to excessive fuel balls. The discharging load borne by each ball-drop pipe is relatively balanced, which helps to extend the service life of the ball-drop pipe, reduce the equipment maintenance cost, and ensure the long-term stable operation of the fuel handling system.

[0037] In actual operation, the opening and closing or flow rate of each ball-drop pipe can be flexibly controlled as needed. For example, according to factors such as the processing capacity of subsequent equipment and the fuel ball demand in different regions, the fuel ball flow rate can be reasonably distributed. This flexibility enables the fuel handling system to better adapt to the complex and changeable operating conditions of the high-temperature gas-cooled reactor. In addition, the multiple ball-drop pipes increase the redundancy of the system. If one of the ball-drop pipes fails (such as blockage, damage, or the container below is full), the other ball-drop pipes can still continue to undertake the discharging task, ensuring that the discharging process is not interrupted and maintaining the normal operation of the high-temperature gas-cooled reactor. This greatly improves the reliability and fault tolerance of the system, reducing the downtime and production losses caused by equipment failures.

[0038] Of course, the above description is not restrictive. In some alternative embodiments, the number of the ball-drop pipes 1 can also be only one, and the ball-drop pipe 1 can also be used in other positions except below the discharging device 5.

[0039] In the fuel handling system of the high-temperature gas-cooled reactor provided in this embodiment, the electromagnetic accelerator 2 includes an insulating pipe and an accelerating coil wound around the insulating pipe. Both ends of the insulating pipe are respectively provided with connection structures for connecting with the ball-drop pipe 1. The specific connection structures include: detachable connections such as flange connection, threaded connection, and plug-in connection. In addition, in some alternative embodiments, non-detachable connections such as bonding and welding can also be used. The insulating pipe can be specifically made of polytetrafluoroethylene material. Polytetrafluoroethylene has good electrical insulation performance, chemical stability, and high-temperature resistance characteristics, and can meet the insulation requirements and different environmental conditions of the electromagnetic accelerator during operation. The accelerating coil can be wound with enameled copper wire. Enameled copper wire has good electrical conductivity and can effectively generate electromagnetic force.

[0040] With the above settings, the insulating tube not only provides support for the accelerating coil, but also effectively prevents electrical short circuits between the coil, the fuel balls, and the ball-drop pipe, and enables the generated magnetic field to act on the fuel balls to the greatest extent, avoiding the influence of the ball-drop pipe. This integrated design makes the electromagnetic accelerator structure compact, easy to install on the ball-drop pipe, and saves space. Connection structures are provided at both ends of the insulating tube for connecting to the ball-drop pipe, enabling the electromagnetic accelerator to be conveniently and quickly connected to the ball-drop pipe, realizing the integration of the entire fuel handling system. The connection structure ensures a reliable connection between the electromagnetic accelerator and the ball-drop pipe, guarantees the smoothness of the fuel balls when passing through the acceleration area, and avoids problems such as ball jamming.

[0041] As Figure 1 shown, in the fuel handling system of the high-temperature gas-cooled reactor provided in this embodiment, the fuel counter 3 and the electromagnetic accelerator 2 are arranged on the same downward extension section of the ball-drop pipe 1. With this arrangement, after the fuel balls are accelerated by the electromagnetic accelerator 2 in the ball-drop pipe 1, they then pass through the fuel counter 3 for detection and counting, which can improve the accuracy of the fuel counter 3 for detection and counting, and avoid the problem that the speed of the fuel balls drops again after a long time of friction in the ball-drop pipe 1. Of course, the above description is not restrictive. In some alternative embodiments, the fuel counter 3 can also be arranged on other sections of the ball-drop pipe 1, such as a certain inclined section, etc.

[0042] As Figure 1 shown, this embodiment also provides a method for preventing the fuel counter from missing counts, including the following steps: During the free-fall motion of the fuel balls in the ball-drop pipe 1, they are first accelerated at least once by the electromagnetic accelerator 2, and then detected and counted by the fuel counter 3.

[0043] The method for preventing the fuel counter from missing counts provided in this embodiment accelerates the moving speed of the fuel balls in the ball-drop pipe by the electromagnetic accelerator 2, thereby increasing the speed of the fuel balls within a limited distance, generating a larger electromotive force when the fuel balls cut the induction coil of the fuel counter 3, being more easily detected, thus preventing the problem of the fuel balls being missed during passing through the counter, and improving the reliability of the system operation.

[0044] As Figure 1As shown, in the method for preventing fuel counter undercounting provided by this embodiment, the fuel ball is accelerated twice by the electromagnetic accelerator 2 within the downward extension section of the ball dropping pipe 1. With such an arrangement, the speed of the fuel ball within the ball dropping pipe 1 can be further increased. After two accelerations, the fuel ball obtains a relatively higher and more stable speed. When passing through the fuel counter, the resulting signal change is more significant. For a fuel counter based on the principle of electromagnetic induction, this enhanced signal is more easily and accurately identified, thereby significantly reducing the possibility of undercounting. Even in a complex industrial environment or in the presence of certain interference, the obvious signal characteristics can help the counter accurately capture the information of the fuel ball passing through. Of course, the above description is not restrictive. In some alternative embodiments, the fuel ball may also be accelerated only once by the electromagnetic accelerator 2 within the downward extension section of the ball dropping pipe 1, or may be accelerated more times by the electromagnetic accelerator 2.

[0045] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom still fall within the protection scope of the present invention.

Claims

1. A high temperature gas-cooled reactor fuel loading and unloading system, characterized in that: include: The ball-dropping pipe (1) has a downwardly extending section; An electromagnetic accelerator (2) is arranged on a downwardly extending section of the ball-falling pipe (1), and the electromagnetic accelerator (2) accelerates the fuel balls in the ball-falling pipe (1) through an accelerating coil; A fuel counter (3) is arranged on the ball-falling pipe (1) and is located below the electromagnetic accelerator (2). The fuel counter (3) counts the number of fuel balls passing through by detecting the wave.

2. The high temperature gas-cooled reactor fuel loading and unloading system according to claim 1, characterized in that: The electromagnetic accelerators (2) are arranged in sequence in a plurality on the downwardly extending section of the same ball-falling pipe (1).

3. The high temperature gas-cooled reactor fuel loading and unloading system according to claim 1, characterized in that: A stop valve (4) is provided on the ball-falling pipeline (1) upstream of the electromagnetic accelerator (2).

4. The high temperature gas-cooled reactor fuel loading and unloading system according to claim 3, characterized in that: The stop valve (4) comprises at least two valves which are arranged in sequence.

5. The high temperature gas-cooled reactor fuel loading and unloading system according to claim 3, characterized in that: The stop valve (4) is a solenoid valve.

6. The high temperature gas-cooled reactor fuel loading and unloading system according to claim 1, characterized in that: The ball-dropping pipe (1) is arranged below the discharge device (5).

7. The high temperature gas-cooled reactor fuel loading and unloading system according to claim 6, characterized in that: The ball-dropping pipe (1) comprises a plurality of pipes arranged below the discharge device (5).

8. The high temperature gas-cooled reactor fuel loading and unloading system according to any one of claims 1 to 7, characterized in that: The electromagnetic accelerator (2) comprises an insulating tube and an accelerating coil wound on the insulating tube, and both ends of the insulating tube are respectively provided with connection structures for connecting to the ball-falling pipe (1).

9. A method for preventing a fuel counter from missing a measurement, characterized in that: The following steps are involved: During the free-falling motion of the fuel ball in the ball-falling pipe (1), the fuel ball is first accelerated at least once by the electromagnetic accelerator (2), and then detected and counted by the fuel counter (3).

10. The method for preventing a fuel counter from missing a measurement according to claim 9, characterized in that: The fuel ball is accelerated twice by the electromagnetic accelerator (2) in the downward extension section of the ball falling pipe (1).

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