A cleaning system for high temperature gas-cooled reactor fuel ball pipeline

Abstract

The invention discloses a cleaning system for a fuel ball pipeline of a high temperature gas-cooled reactor. The first section of the connecting pipeline is connected to a first interface of an inlet distributor, the second interface of the inlet distributor is connected to one end of a pipeline of a system to be cleaned, the second section of the connecting pipeline is connected to a first interface of an outlet distributor, the second interface of the outlet distributor is connected to the other end of the pipeline of the system to be cleaned, the third interface of the inlet distributor is connected to the outlet of a jet emitter, the third interface of the outlet distributor is connected to a rubber ball inlet of a distributor with a filter element, the debris outlet of the distributor with the filter element is connected to the inlet of a debris temporary storage tank, the rubber ball outlet of the distributor with the filter element is connected to the inlet of the jet emitter, the outlet of the debris temporary storage tank is connected to the inlet of a helium storage and supply system via a dust filter, and the system can realize the removal of dust and debris in the fuel ball pipeline of a high temperature gas-cooled reactor.

Description

Technical Field

[0001] The invention belongs to the field of nuclear reactor system operation and relates to a cleaning system for high-temperature gas-cooled reactor fuel ball pipelines. Background Art

[0002] As the world's first nuclear power generating unit with the characteristics of the fourth generation of technology, the high temperature gas-cooled reactor demonstration power plant adopts a non-stop fuel replacement mode and uses 60mm diameter spherical fuel elements. The nuclear fuel flows between the equipment and pipelines of the reactor, loading and unloading system, new fuel system, spent fuel system and other systems. During operation, a large amount of graphite dust will be generated in the system, and when the fuel ball is damaged, debris with different particle diameters will be generated. The diameter of the debris varies. Due to the influence of air flow stratification on the inner wall of the pipeline, gas turbulence at the elbow or component, graphite dust and debris will be deposited on the inner wall of the pipeline and equipment. At present, the method for removing graphite dust in the high temperature gas-cooled reactor design is mainly through compressed gas purging. There is no obvious difference between this method and the gas flow pattern during normal operation, and the stripping of dust and debris is not obvious. If dust and debris accumulate for a long time, it may affect the normal flow of fuel balls and cause the problem of ball jamming. At the same time, these dust and debris may contain a large amount of radioactive nuclides, which will accumulate on pipelines and equipment, greatly increasing the radiation dose level of the system and equipment, and bringing great challenges to the radiation protection management of the power plant. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a cleaning system for a high temperature gas-cooled reactor fuel ball pipeline, which can remove dust and debris in the high temperature gas-cooled reactor fuel ball pipeline.

[0004] To achieve the above-mentioned object, the cleaning system for high temperature gas-cooled reactor fuel ball pipeline of the present invention comprises a control system, an inlet distributor, an outlet distributor, a distributor with filter element, a jet emitter, a compressor, a dust filter, a debris temporary storage tank and two sections of connecting pipelines;

[0005] The first section of the connecting pipeline is connected to the first interface of the inlet distributor, the second interface of the inlet distributor is connected to one end of the pipeline of the cleaned system, the second section of the connecting pipeline is connected to the first interface of the outlet distributor, the second interface of the outlet distributor is connected to the other end of the pipeline of the cleaned system, the third interface of the inlet distributor is connected to the outlet of the jet emitter, the third interface of the outlet distributor is connected to the rubber ball inlet of the filter element distributor, the debris outlet of the filter element distributor is connected to the inlet of the debris temporary storage tank, the rubber ball outlet of the filter element distributor is connected to the inlet of the jet emitter, the outlet of the debris temporary storage tank is connected to the inlet of the helium storage and supply system via the dust filter, and the outlet of the helium storage and supply system is connected to the inlet of the jet emitter via the compressor;

[0006] The control system is connected with the distributor with filter element, the outlet distributor, the inlet distributor and the compressor.

[0007] The third interface of the outlet distributor is connected with the rubber ball inlet of the distributor with filter element through the cleaning system pipeline and the photoelectric counter, and the control system is connected with the photoelectric counter.

[0008] The outlet of the debris temporary storage tank is connected to the inlet of the helium storage and supply system through a dust filter and an exhaust control valve, and the control system is connected to the exhaust control valve.

[0009] The outlet of the helium storage and supply system is connected to the inlet of the jet emitter through the compressor and the air intake control valve, and the control system is connected to the air intake control valve.

[0010] The inlet distributor comprises a first driving motor, a first driving rod, a first rotating valve core and a first valve body;

[0011] The first rotating valve core is located in the first valve body, the output shaft of the first driving motor is connected to one end of the first driving rod, the other end of the first driving rod is connected to the first rotating valve core, the first valve body is provided with a first interface, a second interface and a third interface, the first rotating valve core is provided with a first valve core flow channel, and the control system is connected to the first driving motor.

[0012] When not in the cleaning state, the third interface is closed, the first interface and the second interface are connected with the first valve core flow channel, the fuel ball enters through the first interface and flows out through the second interface; when in the cleaning state, the first valve core flow channel is connected with the second interface and the third interface, the first interface is in a closed state, the rubber ball enters through the third interface and flows out through the second interface.

[0013] The filter element distributor comprises a second driving motor, a second driving rod, a second rotating valve core and a second valve body;

[0014] The second rotary valve core is located in the second valve body, the output shaft of the second drive motor is connected to the second rotary valve core via the second drive rod, a second valve core flow channel is arranged in the second rotary valve core, a rubber ball inlet, a debris outlet and a rubber ball outlet are arranged on the second valve body, a ball blocking filter is arranged in the second valve core flow channel, and the control system is connected to the second drive motor.

[0015] When collecting the balls, the ball blocking filter element is opposite to the rubber ball inlet, the rubber ball outlet is closed, and the debris is filtered by the ball blocking filter element and discharged through the debris outlet; when cleaning is required, the second drive motor drives the second rotary valve core to rotate through the second drive rod, the ball blocking filter element is opposite to the debris outlet, the rubber ball inlet, debris outlet and rubber ball outlet are all connected, the rubber balls are distributed by the ball blocking filter element to flow out of the rubber ball outlet, and part of the airflow carries dust and debris through the ball blocking filter element and is discharged through the debris outlet.

[0016] The photoelectric counter comprises a housing, a photoelectric transmitter and a photoelectric receiver;

[0017] Two opposite light holes are arranged on the side of the shell, wherein the photoelectric receiver faces one light hole, and the photoelectric transmitter faces the other light hole, and both the photoelectric receiver and the photoelectric transmitter are connected to the control system.

[0018] Flanges are arranged at the inlet and outlet of the shell.

[0019] The present invention has the following beneficial effects:

[0020] During specific operation, the cleaning system for high-temperature gas-cooled reactor fuel ball pipelines of the present invention introduces rubber balls into the pipelines of the system to be cleaned, and by switching the inlet distributor, the outlet distributor and the distributor with filter element, the dust and debris attached to the pipe wall are peeled off by the friction between the rubber balls and the pipe wall, and then removed by the distributor with filter element and the dust filter. The cleaning efficiency is much higher than that of pure gas purging, and the design is simple, the equipment structure is simple, and maintenance is convenient. By removing graphite dust and debris in the system and pipelines, the radiation dose level of the system and equipment is greatly reduced, the regional radioactive dose is reduced, and convenience is provided for personnel maintenance and inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 is a state diagram of the inlet distributor 3 when it is not cleaned;

[0023] Figure 3 is a state diagram of the inlet distributor 3 during cleaning;

[0024] Figure 4 is a cross-sectional view of the inlet distributor 3;

[0025] Figure 5 It is a state diagram of the filter element distributor 5 when it is in the ball receiving position;

[0026] Figure 6 It is a state diagram of the filter element distributor 5 in the cleaning position;

[0027] Figure 7 It is a cross-sectional view of a distributor 5 with a filter cartridge;

[0028] Figure 8 is a structural diagram of the photoelectric counter 14;

[0029] Fig. 9 It is the control principle diagram of the present invention.

[0030] Among them, 1 is the pipeline of the cleaned system, 2 is the connecting pipeline, 3 is the inlet distributor, 4 is the outlet distributor, 5 is the distributor with filter element, 6 is the jet emitter, 7 is the compressor, 8 is the cleaning system pipeline, 9 is the exhaust control valve, 10 is the intake control valve, 11 is the dust filter, 12 is the helium storage and supply system, 13 is the debris temporary storage tank, 14 is the photoelectric counter, 15 is the control system, 301 is the first rotary valve core, 302 is the first valve body, 303 is the first interface, 304 is the second interface, 305 is the third interface, 306 is The first valve core flow channel, 307 is the first drive motor, 308 is the first drive rod, 309 is the interface ac valve core flow channel, 310 is the interface c valve core flow channel, 501 is the second rotating valve core, 502 is the second valve body, 503 is the rubber ball inlet, 504 is the debris outlet, 505 is the rubber ball outlet, 506 is the second valve core flow channel, 507 is the ball blocking filter element, 508 is the second drive motor, 509 is the second drive rod, 1401 is the photoelectric receiver, 1402 is the light hole, 1403 is the shell, 1404 is the flange, and 1405 is the photoelectric transmitter. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments, and is not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0032] The accompanying drawings show schematic diagrams of structures according to embodiments disclosed in the present invention. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0033] refer to Figure 1 and Fig. 9 The cleaning system for high temperature gas-cooled reactor fuel ball pipeline of the present invention comprises an inlet distributor 3, an outlet distributor 4, a distributor with filter element 5, a jet emitter 6, a compressor 7, an exhaust control valve 9, an intake control valve 10, a dust filter 11, a debris temporary storage tank 13 and a photoelectric counter 14;

[0034] The first section of the connecting pipe 2 is connected to the first interface 303 of the inlet distributor 3, the second interface 304 of the inlet distributor 3 is connected to one end of the pipeline 1 of the system to be cleaned, the second section of the connecting pipe 2 is connected to the first interface 303 of the outlet distributor 4, the second interface 304 of the outlet distributor 4 is connected to the other end of the pipeline 11 of the system to be cleaned, the third interface 305 of the inlet distributor 3 is connected to the outlet of the jet emitter 6, and the third interface 305 of the outlet distributor 4 is connected to the outlet of the jet emitter 6 through the cleaning system pipeline 8. The photoelectric counter 14 is connected to the rubber ball inlet 503 of the filter element distributor 5, the debris outlet 504 of the filter element distributor 5 is connected to the inlet of the debris temporary storage tank 13, the rubber ball outlet 505 of the filter element distributor 5 is connected to the inlet of the jet emitter 6, the outlet of the debris temporary storage tank 13 is connected to the inlet of the helium storage and supply system 12 through the dust filter 11 and the exhaust control valve 9, and the outlet of the helium storage and supply system 12 is connected to the inlet of the jet emitter 6 through the compressor 7 and the intake control valve 10;

[0035] The main functions of the inlet distributor 3 and the outlet distributor 4 are to conduct the fuel ball during the normal operation of the unit and conduct the rubber ball used for cleaning during pipeline cleaning. The diameter of the rubber ball is equal to the inner diameter of the pipeline and has compressible characteristics. The flow power in the pipeline comes from the kinetic energy of the gas. The kinetic energy of the gas in the pipeline is provided by the compressor 7 and the jet emitter 6. During the cleaning period, a certain air pressure is maintained in the system and the pipeline, which is achieved by controlling the exhaust control valve 9 and the intake control valve 10. The dust and debris brought out by the rubber ball cleaning first pass through the debris temporary storage tank 13, so that some small particles of dust suspended in the air flow are finally collected by the dust filter 11.

[0036] refer to Figure 2 , Figure 3 and Figure 4The inlet distributor 3 includes a first driving motor 307, a first driving rod 308, a first rotating valve core 301 and a first valve body 302. The first rotating valve core 301 is located in the first valve body 302. The output shaft of the first driving motor 307 is connected to one end of the first driving rod 308. The other end of the first driving rod 308 is connected to the first rotating valve core 301. The first valve body 302 is provided with a first interface 303, a second interface 304 and a third interface 305. The first rotating valve core 301 is provided with a first valve core flow channel 306. The first valve core flow channel 306 includes interfaces ac and valve core The flow channel 309 and the valve core flow channel 310 of the interface c, wherein the valve core flow channel 310 of the interface c is connected with the valve core flow channel 309 of the interface ac. When not in the cleaning state, the third interface 305 is closed, the first interface 303 and the second interface 304 are connected with the first valve core flow channel 306, and the fuel ball enters through the first interface 303 and flows out through the second interface 304; when in the cleaning state, the first valve core flow channel 306 is connected with the second interface 304 and the third interface 305, the first interface 303 is in a closed state, the rubber ball enters through the third interface 305, and flows out through the second interface 304;

[0037] In addition, the principles of the outlet distributor 4 and the inlet distributor 3 are basically similar.

[0038] refer to Figure 5 , Figure 6 and Figure 7 The filter element distributor 5 includes a second driving motor 508, a second driving rod 509, a second rotating valve core 501, a second valve body 502 and a ball-blocking filter element 507;

[0039] Among them, the second rotary valve core 501 is located in the second valve body 502, the output shaft of the second drive motor 508 is connected to the second rotary valve core 501 through the second drive rod 509, the second rotary valve core 501 is provided with a second valve core flow channel 506, the second valve body 502 is provided with a rubber ball inlet 503, a debris outlet 504 and a rubber ball outlet 505, and the second valve core flow channel 506 is provided with a ball blocking filter element 507. When the ball is collected, the ball blocking filter element 507 is directly opposite to the rubber ball inlet 503, the rubber ball outlet 505 is closed, and the debris is filtered by the ball blocking filter element 507 and discharged through the debris outlet 504; when cleaning is required, refer to Figure 6 The second driving motor 508 drives the second rotating valve core 501 to rotate through the second driving rod 509, and the ball blocking filter element 507 is directly opposite to the debris outlet 504. The rubber ball inlet 503, the debris outlet 504 and the rubber ball outlet 505 are all connected. The rubber ball is distributed to the rubber ball outlet 505 by the ball blocking filter element 507 and flows out. Part of the airflow carries dust and debris through the ball blocking filter element 507 and is discharged through the debris outlet 504.

[0040] refer to Figure 8The photoelectric counter 14 is installed between the cleaning system pipeline 8 and the rubber ball inlet 503, and is used to detect the state of the cleaning rubber ball. The photoelectric counter 14 includes a shell 1403, a photoelectric transmitter 1405 and a photoelectric receiver 1401, wherein flanges 1404 are provided at the entrance and exit of the shell 1403, and two opposite light holes 1402 are provided on the side of the shell 1403, wherein the photoelectric receiver 1401 faces one light hole 1402, and the photoelectric transmitter 1405 faces the other light hole 1402. The photoelectric receiver 1401 and the photoelectric transmitter 1405 are both connected to the control system 15. When working, when the rubber ball flows through, the optical signal is blocked by the rubber ball for a short time, and the photoelectric receiver 1401 cannot receive the signal for a short time; when the rubber ball is in the state of recycling, the rubber ball is blocked at the light hole 1402 by the ball blocking filter 507, and the photoelectric receiver 1401 cannot receive the optical signal continuously, and the control system 15 judges the state of the rubber ball by the optical signal reception situation.

[0041] During the normal operation of the unit, the first interface 303 and the third interface 305 of the inlet distributor 3 and the outlet distributor 4 are connected, the second interface 304 is closed, the fuel balls can flow normally, the cleaning system is completely shut down, the rubber ball inlet 503 and the debris outlet 504 in the filter element distributor 5 are connected, the rubber ball outlet 505 is closed, the rubber ball is intercepted at the entrance of the filter element distributor 5, the intake control valve 10 and the exhaust control valve 9 are closed, and the cleaning system is isolated from the helium storage and supply system 12; when it is necessary to clean the online system and pipeline, the fuel balls in the pipeline 1 of the cleaning system are first discharged, and the specific process is as follows:

[0042] 11) System boost

[0043] The control system 15 controls the intake control valve 10 and the exhaust control valve 9 to open slowly;

[0044] 12) System parallel

[0045] When the system pressure rises to the same pressure as the cleaned system pipeline 1, the control system 15 controls the inlet distributor 3 and the outlet distributor 4 to open, so that the first interface 303 in the inlet distributor 3 and the outlet distributor 4 is closed, and the second interface 304 and the third interface 305 are connected;

[0046] 13) Establish airflow

[0047] Start the compressor 7, suck helium from the helium storage and supply system 12 and increase the pressure, adjust the air intake control valve 10 to control the air flow speed of the jet emitter 6, adjust the exhaust control valve 9 to control the pressure stability of the cleaning system and pipeline, and the air flow passes through the rubber ball inlet 503 and the debris outlet 504 of the filter element distributor 5;

[0048] 14) Establish a rubber ball circulation

[0049] When the air flow velocity of the jet emitter 6 reaches a level capable of launching rubber balls for cleaning, the rubber ball inlet 503, the rubber ball outlet 505 and the debris outlet 504 in the filter element distributor 5 are connected. At this time, the rubber balls continuously circulate in the system, and the friction between the rubber balls and the pipe wall peels off the dust and debris attached to the pipe wall. During the operation of the cleaning system, the control system 15 controls the intake control valve 10 and the exhaust control valve 9 to keep the cleaning system stable at a certain pressure and flow rate.

[0050] During operation, dust and debris first enter the debris temporary storage tank 13, and the dust suspended in the gas enters the exhaust pipe with the air flow and is collected in the dust filter 11. During the operation of the system, the circulation status of the rubber ball is monitored by the photoelectric counter 14.

[0051] The shutdown process of the present invention is:

[0052] 21) Recycling rubber balls

[0053] The control system 15 makes the rubber ball inlet 503 and the debris outlet 504 of the filter element distributor 5 conductive and the rubber ball outlet 505 closed. At this time, only the airflow can enter the debris storage tank 13 through the ball-blocking filter element 507 of the filter element distributor 5. The rubber ball is intercepted before the ball-blocking filter element 507, and the rubber ball state can be observed by the photoelectric counter 14.

[0054] 22) Gas cleaning

[0055] Since a part of the airflow still fails to pass through the debris storage tank 13 and the dust filter 11 during the system cleaning period, the system still needs to run for a period of time after the rubber balls are recovered. At this time, the airflow completely passes through the debris storage tank 13 and the dust filter 11. The control system 15 controls the intake control valve 10 and the exhaust control valve 9 to make the system pressure and flow within the required range.

[0056] 23) System outage

[0057] Stop the compressor 7, adjust the system pressure to the required value by adjusting the intake control valve 10 and the exhaust control valve 9, and finally close the intake control valve 10 and the exhaust control valve 9.

[0058] 24) System decoupling

[0059] The control system 15 rotates the inlet distributor 3 and the outlet distributor 4, so that the first interface 303 and the second interface 304 of the inlet distributor 3 and the outlet distributor 4 are connected and the third interface 305 is closed, so that the cleaned system pipeline 1 is connected with the power plant operation system. At this time, the cleaning system is isolated from the online system, and then the system pressure is gradually reduced by adjusting the air intake control valve 10 and the exhaust control valve 9 to discharge the residual gas in the cleaning system.

Claims

1. A cleaning system for high temperature gas-cooled reactor fuel ball pipeline, characterized in that: It comprises a control system (15), an inlet distributor (3), an outlet distributor (4), a distributor with a filter element (5), a jet emitter (6), a compressor (7), a dust filter (11), a debris temporary storage tank (13) and two sections of connecting pipes (2); The first section of the connecting pipe (2) is connected to the first interface (303) of the inlet distributor (3), the second interface (304) of the inlet distributor (3) is connected to one end of the pipeline (1) of the system to be cleaned, the second section of the connecting pipe (2) is connected to the first interface (303) of the outlet distributor (4), the second interface (304) of the outlet distributor (4) is connected to the other end of the pipeline (1) of the system to be cleaned, the third interface (305) of the inlet distributor (3) is connected to the outlet of the jet emitter (6), and the outlet distributor (4) is connected to the outlet of the jet emitter (6). The third interface (305) is connected to the rubber ball inlet (503) of the filter element distributor (5), the debris outlet (504) of the filter element distributor (5) is connected to the inlet of the debris temporary storage tank (13), the rubber ball outlet (505) of the filter element distributor (5) is connected to the inlet of the jet emitter (6), the outlet of the debris temporary storage tank (13) is connected to the inlet of the helium storage and supply system (12) via the dust filter (11), and the outlet of the helium storage and supply system (12) is connected to the inlet of the jet emitter (6) via the compressor (7); The control system (15) is connected to the distributor with filter element (5), the outlet distributor (4), the inlet distributor (3) and the compressor (7); The inlet distributor (3) comprises a first driving motor (307), a first driving rod (308), a first rotating valve core (301) and a first valve body (302); The first rotating valve core (301) is located in the first valve body (302), the output shaft of the first driving motor (307) is connected to one end of the first driving rod (308), the other end of the first driving rod (308) is connected to the first rotating valve core (301), the first valve body (302) is provided with a first interface (303), a second interface (304) and a third interface (305), the first rotating valve core (301) is provided with a first valve core flow channel (306), and the control system (15) is connected to the first driving motor (307); When not in the cleaning state, the third interface (305) is closed, the first interface (303) and the second interface (304) are connected to the first valve core flow channel (306), and the fuel ball enters through the first interface (303) and flows out through the second interface (304); when in the cleaning state, the first valve core flow channel (306) is connected to the second interface (304) and the third interface (305), the first interface (303) is in a closed state, the rubber ball enters through the third interface (305) and flows out through the second interface (304); The filter element dispenser (5) comprises a second driving motor (508), a second driving rod (509), a second rotating valve core (501) and a second valve body (502); The second rotary valve core (501) is located in the second valve body (502), the output shaft of the second drive motor (508) is connected to the second rotary valve core (501) via the second drive rod (509), a second valve core flow channel (506) is provided in the second rotary valve core (501), a rubber ball inlet (503), a debris outlet (504) and a rubber ball outlet (505) are provided on the second valve body (502), a ball blocking filter (507) is provided in the second valve core flow channel (506), and the control system (15) is connected to the second drive motor (508); When collecting balls, the ball blocking filter (507) faces the rubber ball inlet (503), the rubber ball outlet (505) is closed, and debris is filtered by the ball blocking filter (507) and discharged through the debris outlet (504); when cleaning is required, the second drive motor (508) drives the second rotary valve core (501) to rotate through the second drive rod (509), the ball blocking filter (507) faces the debris outlet (504), the rubber ball inlet (503), the debris outlet (504) and the rubber ball outlet (505) are all connected, and the rubber balls are distributed by the ball blocking filter (507) to the rubber ball outlet (505) to flow out, and part of the airflow carries dust and debris through the ball blocking filter (507) and is discharged through the debris outlet (504).

2. The cleaning system for high temperature gas-cooled reactor fuel ball pipeline according to claim 1 is characterized in that: The third interface (305) of the outlet distributor (4) is connected to the rubber ball inlet (503) of the filter element distributor (5) through the cleaning system pipeline (8) and the photoelectric counter (14), and the control system (15) is connected to the photoelectric counter (14).

3. The cleaning system for high temperature gas-cooled reactor fuel ball pipeline according to claim 1, characterized in that: The outlet of the debris temporary storage tank (13) is connected to the inlet of the helium storage and supply system (12) through the dust filter (11) and the exhaust control valve (9), and the control system (15) is connected to the exhaust control valve (9).

4. The cleaning system for high temperature gas-cooled reactor fuel ball pipeline according to claim 1, characterized in that: The outlet of the helium storage and supply system (12) is connected to the inlet of the jet emitter (6) via the compressor (7) and the air intake control valve (10), and the control system (15) is connected to the air intake control valve (10).

5. The cleaning system for high temperature gas-cooled reactor fuel ball pipeline according to claim 2, characterized in that: The photoelectric counter (14) comprises a housing (1403), a photoelectric transmitter (1405) and a photoelectric receiver (1401); Two light holes (1402) facing each other are arranged on the side of the shell (1403), wherein the photoelectric receiver (1401) faces one light hole (1402), and the photoelectric transmitter (1405) faces the other light hole (1402), and the photoelectric receiver (1401) and the photoelectric transmitter (1405) are both connected to the control system (15).

6. The cleaning system for high temperature gas-cooled reactor fuel ball pipeline according to claim 5, characterized in that: Flanges (1404) are provided at the inlet and outlet of the shell (1403).

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