System for recovering radioactive deposits at bottom of large tank

Abstract

The utility model provides a system for recovering radioactive deposits at the bottom of a large tank. The system for recovering the radioactive deposits at the bottom of the large tank comprises a walking device used for walking at the bottom of the large tank and a collecting bin used for collecting the radioactive deposits, a suction nozzle is carried on the walking device, the suction nozzle is communicated with the collecting bin through a suction pipe, and the suction pipe is communicated with the collecting bin. A detection device used for detecting the height of radioactive sediments in the material collecting bin is arranged on the material collecting bin, the bottom of the material collecting bin is communicated with a discharging device, the discharging device is provided with a discharging valve, and the detection device triggers an interlocking signal for opening the discharging valve when detecting that the height of the radioactive sediments is at a high position. And the detection device triggers an interlocking signal for closing the discharge valve when detecting that the height of the radioactive sediment is at a low position. The system provided by the utility model can realize automatic recovery of radioactive deposits at the bottom of a large tank.

Description

Technical Field

[0001] This utility model relates to the field of nuclear facility technology, and in particular to a system for retrieving radioactive deposits from the bottom of large tanks. Background Technology

[0002] Radioactive liquids are generated in nuclear power plants, nuclear industry sectors, and units that research and apply radioactive isotopes and nuclear technologies. Especially in reprocessing plants, the amount of radioactive liquid generated is very high, and the radioactivity level is also very high. This type of radioactive waste liquid generally cannot be disposed of immediately but is temporarily stored in large tanks. Over time, impurities, crystalline salts, and radioactive substances such as anti-corrosion paint from the tank surface accumulate at the bottom of the tanks.

[0003] However, due to the large bottom area of ​​large tanks and the concrete shielding layer at the top, the maximum credible opening of the tank is small, making it impossible to retrieve radioactive deposits from the bottom. Therefore, there is a need to develop a retrieval device capable of automatically retrieving radioactive deposits from the bottom of large tanks.

[0004] In view of this, this utility model is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a system for retrieving radioactive deposits from the bottom of large tanks, which can automatically retrieve radioactive deposits from the bottom of large tanks.

[0006] This invention provides a system for retrieving radioactive deposits from the bottom of a large tank, comprising a walking device for moving along the bottom of the large tank and a collection bin for collecting radioactive deposits. A suction nozzle is mounted on the walking device and connected to the collection bin via a suction tube. A detection device for detecting the height of radioactive deposits in the collection bin is installed on the collection bin. The bottom of the collection bin is connected to a discharge device, which is equipped with a discharge valve. When the detection device detects that the radioactive deposit height is high, it triggers a chain signal to open the discharge valve; when the detection device detects that the radioactive deposit height is low, it triggers a chain signal to close the discharge valve.

[0007] Furthermore, the system of this utility model also includes an exhaust gas purification device, and the top of the collection bin is connected to the exhaust gas purification device through an exhaust gas emission pipe.

[0008] Furthermore, the detection device includes a high-level limiter and a low-level limiter. The high-level limiter triggers an interlock signal to open the unloading valve when the radioactive deposit height rises to a high level, and the low-level limiter triggers an interlock signal to close the unloading valve when the radioactive deposit height drops to a low level.

[0009] Furthermore, the walking device is a magnetic adsorption robot.

[0010] Furthermore, the walking device is capable of automatically moving along a preset path throughout the entire area at the bottom of the large tank.

[0011] Furthermore, a depth measuring instrument is installed on the walking device to measure the depth of radioactive deposits at the bottom of large tanks.

[0012] Furthermore, a high-pressure water nozzle is installed on the walking device, and the high-pressure water nozzle is positioned so as to face the bottom of the large tank.

[0013] Furthermore, the spray direction of the high-pressure water nozzle is at a 90°-120° angle to the bottom surface of the large tank.

[0014] Furthermore, the two ends of the suction tube are connected to the collection bin and the suction nozzle respectively via quick connectors.

[0015] Furthermore, a handle is provided at the top of the nozzle, and a gas-liquid ratio controller is provided at the bottom of the nozzle.

[0016] This invention relates to a system for retrieving radioactive deposits from the bottom of large tanks. The system includes a traveling device and a collection bin. The traveling device can move along the bottom of the large tank and is equipped with a suction nozzle for retrieving radioactive deposits. This effectively draws the radioactive deposits from the bottom of the large tank into the collection bin, achieving high suction efficiency. Simultaneously, the collection bin is equipped with a detection device to monitor the height of the radioactive deposits. When the detection device detects that the height of the radioactive deposits is high or low, it triggers an interlocking signal to open or close the discharge valve, allowing for the simultaneous suction and discharge of the radioactive deposits. This precise discharge of radioactive deposits from the collection bin enables remote operation, effectively reducing personnel radiation exposure. Furthermore, an exhaust gas purification device can be installed to collect and treat the exhaust gas generated during the suction process, significantly improving the efficiency of radioactive deposit retrieval. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a system for retrieving radioactive deposits from the bottom of a large tank, according to one embodiment;

[0019] Figure 2This is a schematic diagram of the nozzle structure according to one embodiment.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1: Large tank; 2: Walking device; 3: Collection bin; 4: Suction nozzle; 5: Suction pipe; 6: Unloading device; 7: High limit switch; 8: Low limit switch; 9: Depth measuring instrument; 10: High-pressure water nozzle; 11: Quick connector; 12: Handle; 13: Gas-liquid ratio controller; 14: Exhaust gas purification device; 15: Exhaust gas emission pipe; 16: Support; 17: Maximum reliable opening. Detailed Implementation

[0022] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form includes the plural form unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this description, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0024] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] Example 1

[0026] like Figure 1 As shown, the system for retrieving radioactive deposits from the bottom of a large tank 1 in this embodiment includes a walking device 2 for moving along the bottom of the large tank 1 and a collection bin 3 for collecting radioactive deposits. A suction nozzle 4 is mounted on the walking device 2, and the suction nozzle 4 is connected to the collection bin 3 through a suction pipe 5. A detection device for detecting the height of radioactive deposits in the collection bin 3 is provided on the collection bin 3. The bottom of the collection bin 3 is connected to a discharge device 6, and the discharge device 6 is provided with a discharge valve. When the detection device detects that the height of radioactive deposits is high, it triggers a chain signal to open the discharge valve. When the detection device detects that the height of radioactive deposits is low, it triggers a chain signal to close the discharge valve.

[0027] The walking device 2 is mainly used for moving around the bottom of the large tank 1. There are no strict limitations on the walking device 2; conventional walking equipment in the art can be used, such as a magnetic adsorption robot. The magnetic adsorption robot can enter the large tank 1 through the largest reliable opening 17, thereby achieving effective contact between the suction nozzle 4 and the radioactive deposits at the bottom of the large tank 1. Furthermore, the walking device 2 can automatically move along a preset path throughout the entire area at the bottom of the large tank 1, facilitating the suction nozzle 4 mounted on it to fully retrieve the radioactive deposits from the bottom of the large tank 1.

[0028] A depth measuring instrument 9 is installed on the walking device 2 to measure the depth of radioactive deposits at the bottom of the large tank 1. In addition, a high-pressure water nozzle 10 is provided on the walking device 2, which is positioned towards the bottom of the large tank 1; more specifically, the spray direction of the high-pressure water nozzle 10 is at 90°-120° with the bottom surface of the large tank 1, thereby flushing the solidified deposits at the bottom of the large tank 1, which facilitates suction by the suction nozzle 4.

[0029] The suction nozzle 4 is mainly used to retrieve radioactive deposits from the bottom of the large tank 1. The suction nozzle 4 is mounted on the traveling device 2. As the traveling device 2 travels along the bottom of the large tank 1, the suction nozzle 4 retrieves the radioactive deposits from the bottom of the large tank 1. It can be understood that the suction nozzle 4 advances in a direction perpendicular to the bottom surface of the large tank 1 to suction the radioactive deposits from the bottom of the large tank 1. The suction nozzle 4 is mounted on the traveling device 2, thus enabling the suction nozzle 4 to enter the large tank 1 through the largest reliable opening 17 and suction the radioactive deposits from all areas of its bottom.

[0030] The structure of the suction nozzle 4 is not strictly limited, as long as it can effectively extract radioactive deposits from the bottom of the large tank 1; specifically, such as Figure 2 As shown, a gas-liquid ratio controller 13 is provided at the lower part of the suction nozzle 4 to ensure that the suction nozzle 4 has sufficient air intake; in addition, a handle 12 can be provided at the upper part of the suction nozzle 4. It can be understood that when the radioactive deposits at the bottom of the large tank 1 are deep, the depth of the suction nozzle 4 in the radioactive deposits can be adjusted to ensure that the gas-liquid ratio controller 13 is not submerged, thereby ensuring that the suction nozzle 4 has sufficient air intake.

[0031] The collection bin 3 is mainly used to collect the radioactive deposits retrieved from the bottom of the large tank 1 by the suction nozzle 4. The collection bin 3 can be installed on the bracket 16. The collection bin 3 is connected to the suction nozzle 4 through the suction pipe 5. The two ends of the suction pipe 5 are connected to the collection bin 3 and the suction nozzle 4 respectively through the quick connector 11. The radioactive deposits at the bottom of the large tank 1 enter the collection bin 3 in sequence through the suction nozzle 4 and the suction pipe 5.

[0032] The detection device is mainly used to detect the height of radioactive deposits in the collection silo 3 and send interlocking signals to open or close the unloading valve of the unloading device 6 based on the height of the radioactive deposits. More specifically, the detection device may include a high-level limiter 7 and a low-level limiter 8, which are respectively located at the upper and lower parts of the collection silo 3. The high-level limiter 7 triggers an interlocking signal to open the unloading valve when the height of the radioactive deposits rises to the high level, and the low-level limiter 8 triggers an interlocking signal to close the unloading valve when the height of the radioactive deposits falls to the low level. At this time, when the height of the radioactive deposits in the collection silo 3 reaches the high-level limiter 7, an interlocking signal is triggered to open the unloading valve; when the height of the radioactive deposits in the collection silo 3 falls to the low-level limiter 8, an interlocking signal is triggered to close the unloading valve, thereby realizing the automatic suction and discharge of radioactive deposits at the bottom of the large tank 1.

[0033] In addition, the above system may also include an exhaust gas purification device 14. The top of the collection bin 3 is connected to the exhaust gas purification device 14 through an exhaust gas discharge pipe 15, thereby realizing the purification treatment of the radioactive exhaust gas generated during the negative pressure suction process.

[0034] The system operation process in this embodiment is as follows:

[0035] Before operation, the system is in its initial state. The walking device 2 enters the large tank 1 through the largest reliable opening 17 of the large tank 1; the suction pipe 5 is connected to the suction nozzle 4 and the collection bin 3 through the quick connector 11 and is kept sealed; the exhaust pipe 15 is connected to the exhaust gas purification device 14 and the collection bin 3 and is kept sealed.

[0036] During operation, the walking device 2 is equipped with a suction nozzle 4, which is perpendicular to the bottom surface of the large tank 1. The walking device 2 automatically moves along a preset path at the bottom of the large tank 1, while the suction nozzle 4 sucks up the radioactive deposits at the bottom of the large tank 1. When the radioactive deposits enter the collection bin 3 through the suction pipe 5, the discharge valve of the unloading device 6 is closed. When the height of the radioactive deposits in the collection bin 3 reaches the high limit device 7, an interlock signal is triggered, opening the discharge valve of the unloading device 6, and the radioactive deposits in the collection bin 3 are collected. When the height of the radioactive deposits in the collection bin 3 drops to the low limit device 8, an interlock signal is triggered, closing the discharge valve of the unloading device 6, and the collection bin 3 resumes collecting the radioactive deposits. This cycle repeats, achieving automatic suction and discharge.

[0037] The system in this embodiment includes a traveling device 2 and a collection bin 3. The traveling device 2 can travel at the bottom of the large tank 1 and is equipped with a suction nozzle 4 for retrieving radioactive deposits from the bottom of the large tank 1. This allows for the efficient suction of radioactive deposits from the bottom of the large tank 1 into the collection bin 3. Simultaneously, the collection bin 3 is equipped with a detection device for detecting the height of the radioactive deposits. When the detection device detects that the height of the radioactive deposits is high or low, it can trigger an interlocking signal to open or close the unloading valve, thereby allowing for the simultaneous suction and discharge of the radioactive deposits. This achieves precise discharge of radioactive deposits from the collection bin 3 and enables remote operation, effectively reducing the radiation dose to personnel. Furthermore, an exhaust gas purification device 14 can be installed to collect and treat the exhaust gas generated during the suction process, greatly improving the efficiency of radioactive deposit retrieval.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A system for retrieving radioactive sediments from the bottom of large tanks, characterized in that, It includes a walking device for moving along the bottom of a large tank and a collection bin for collecting radioactive deposits. The walking device is equipped with a suction nozzle, which is connected to the collection bin via a suction pipe. The collection bin is equipped with a detection device for detecting the height of radioactive deposits in the collection bin. The bottom of the collection bin is connected to a discharge device, which is equipped with a discharge valve. When the detection device detects that the height of radioactive deposits is high, it triggers a chain signal to open the discharge valve. When the detection device detects that the height of radioactive deposits is low, it triggers a chain signal to close the discharge valve.

2. The system according to claim 1, characterized in that, It also includes an exhaust gas purification device, which is connected to the top of the collection silo via an exhaust gas emission pipe.

3. The system according to claim 1, characterized in that, The detection device includes a high-level limiter and a low-level limiter. The high-level limiter triggers an interlock signal to open the unloading valve when the radioactive deposit height rises to a high level, and the low-level limiter triggers an interlock signal to close the unloading valve when the radioactive deposit height drops to a low level.

4. The system according to claim 1, characterized in that, The walking mechanism is a magnetic adsorption robot.

5. The system according to claim 1, characterized in that, The walking device can automatically move along a preset path throughout the entire area at the bottom of a large tank.

6. The system according to claim 1, characterized in that, The traveling device is equipped with a depth measuring instrument for measuring the depth of radioactive deposits at the bottom of large tanks.

7. The system according to claim 1, characterized in that, The traveling device is equipped with high-pressure water nozzles, which are positioned so as to face the bottom of the large tank.

8. The system according to claim 7, characterized in that, The high-pressure water nozzles spray at an angle of 90°-120° to the bottom of the large tank.

9. The system according to claim 1, characterized in that, The two ends of the suction tube are connected to the collection bin and the suction nozzle respectively via quick connectors.

10. The system according to claim 1, characterized in that, A handle is located at the top of the nozzle, and a gas-liquid ratio controller is located at the bottom of the nozzle.

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