Intelligent monitoring system for radioactive waste liquid

Abstract

The utility model discloses an intelligent monitoring system for radioactive waste liquid, comprising a sedimentation tank, a decay tank arranged behind the sedimentation tank, and a pumping mechanism for pumping out radioactive waste liquid, wherein the sedimentation tank and the decay tank are equipped with liquid level detectors, the liquid outlet of the decay tank is respectively connected with the inlet of the sampling monitoring pipeline and the inlet of the drainage pipeline, the sampling monitoring pipeline is provided with a radioactivity detector, the outlet of the sampling monitoring pipeline is connected with the liquid inlet of the decay tank; the liquid inlet pipeline of the decay tank is provided with a liquid inlet flowmeter, and the liquid drainage pipeline is provided with a drainage flowmeter; the pumping mechanism comprises a submersible sewage pump arranged in the sedimentation tank, a self-priming sewage pump arranged on the liquid outlet pipeline of the decay tank, and an electric control valve for controlling the opening and closing of the pipeline. The intelligent monitoring system for radioactive waste liquid provided by the utility model solves the problems of low efficiency, large human resource consumption, and slow response speed in the current manual monitoring of radioactive waste liquid.

Description

Technical Field

[0001] The utility model belongs to the technical field of radioactive waste liquid treatment, and in particular relates to an intelligent monitoring system for radioactive waste liquid. Background Art

[0002] Radioactive liquid waste is generated during the actual operation of nuclear medicine departments, nuclear medicine production bases, and radionuclide use and research laboratories. It must decay for a period of time so that the radioactivity of the waste liquid reaches below the safety value specified by the state before it can be discharged into water bodies or urban sewers.

[0003] At present, the traditional method of monitoring radioactive liquid waste emissions, that is, professionals regularly collect samples from decay pools and send them to professional laboratories to measure their radioactive activity, has gradually revealed its limitations, such as low efficiency, high human resource consumption, and slow response speed, and cannot meet the needs of the development of modern radioactive liquid waste treatment. Utility Model Content

[0004] The utility model aims at solving the above problems and provides an intelligent monitoring system for radioactive waste liquid, aiming to solve the problems of low efficiency, large human resource consumption and slow response speed in current manual monitoring of radioactive waste liquid.

[0005] The utility model is implemented as follows: an intelligent monitoring system for radioactive waste liquid comprises a sedimentation tank, a decay tank arranged behind the sedimentation tank and a pumping mechanism for pumping out radioactive waste liquid, wherein liquid level detectors are installed on the sedimentation tank and the decay tank, the liquid outlet of the decay tank is respectively connected with the inlet of a sampling monitoring pipeline and the inlet of a liquid discharge pipeline, the sampling monitoring pipeline is provided with a radioactivity detector, the outlet of the sampling monitoring pipeline is connected with the liquid inlet of the decay tank to form a circulation loop; a liquid inlet flowmeter is arranged on the liquid inlet pipeline of the decay tank, and a liquid discharge flowmeter is arranged on the liquid discharge pipeline; the pumping mechanism comprises a submersible sewage pump, a self-priming sewage pump and an electric control valve for controlling the opening and closing of the pipeline, the submersible sewage pump is arranged in the sedimentation tank, and the self-priming sewage pump is arranged on the liquid outlet pipeline of the decay tank.

[0006] The utility model transports radioactive waste liquid in a sedimentation tank to a decay tank for decay treatment through a submersible sewage pump; the liquid in the decay tank is tested for radioactivity through a self-priming sewage pump via a sampling and monitoring pipeline; the waste liquid that meets the standards is discharged from the decay tank through a drainage pipeline through the self-priming sewage pump; the actions of liquid inletting into the sedimentation tank and the decay tank, sampling monitoring, and liquid discharge are completed, and intelligent monitoring of the entire process of collecting, controlling, sampling, monitoring, and discharging radioactive waste liquid is realized. Among them, the liquid level detector monitors the liquid level status of the sedimentation tank and the decay tank in real time, and by connecting the outlet of the sampling monitoring pipeline with the liquid inlet of the decay tank to form a circulation loop, the sampled waste liquid can be returned to the decay tank, avoiding waste liquid contamination caused by sampling; by setting up the liquid inlet flowmeter and the liquid discharge flowmeter, the liquid inlet and discharge volume of the radioactive waste liquid are monitored in real time, and a radioactive waste liquid ledger is established to facilitate the staff to grasp the dynamic changes of the radioactive waste liquid in real time. Since the effective total volume of the decay tank is fixed and limited, and the storage and decay period required for the treatment of radioactive waste liquid in the decay tank is relatively long, the observation and analysis of the dynamic changes of the radioactive waste liquid can provide a reference basis for the changes in the amount of radioactive waste liquid treated in actual work.

[0007] Furthermore, in some embodiments of the utility model, the electric-controlled valve includes a first liquid inlet electric-controlled valve, a second liquid inlet electric-controlled valve, a pool liquid discharge electric-controlled valve, a liquid discharge master control valve and a sampling electric-controlled valve, the first liquid inlet electric-controlled valve is arranged on the liquid inlet pipe of the sedimentation tank, the second liquid inlet electric-controlled valve is arranged on the liquid inlet pipe of the decay tank, the pool liquid discharge electric-controlled valve is arranged on the liquid outlet pipe of the decay tank, the liquid discharge master control valve is arranged on the liquid discharge pipeline, and the sampling electric-controlled valve is arranged on the sampling monitoring pipeline.

[0008] Preferably, a filter is provided on the sampling monitoring pipeline, and the filter is used to filter impurities to reduce the entry of foreign matter into the radioactivity detector, thereby improving the accuracy of the detection data of the radioactivity detector.

[0009] Preferably, a manual sampling pipeline is provided to allow operators to manually sample the radioactive waste liquid in each decay pool. The manual sampling pipeline is connected in parallel with the sampling monitoring pipeline. A pressure regulating valve is provided on the sampling monitoring pipeline. The pressure on the sampling monitoring pipeline is adjusted by the pressure regulating valve so that liquid can be discharged from the manual sampling pipeline for manual sampling. This improves the traditional method of reserving sampling ports in each pool and manually opening the bulky pool cover for sampling, saves the labor cost of the sampling process, and reduces the risk of radiation exposure to sampling personnel.

[0010] Preferably, the number of the sedimentation tanks is at least two, and the sedimentation tanks are arranged in parallel in multiple stages. The utility model divides the sedimentation tank into a main tank and a backup tank, and the main tank and the backup tank are used alternately to avoid abnormal conditions such as equipment failure, retrieval, cleaning, etc. in the sedimentation tank that affect the normal operation of the system, and ensure the normal use of the decay tank. In addition, the alternating use of the main tank and the backup tank can also reduce the use frequency of the submersible sewage pump in each sedimentation tank and reduce the failure rate of the submersible sewage pump.

[0011] Preferably, the number of the decay pools is at least two, and the decay pools are arranged in a plurality and arranged in a multi-stage parallel relationship, which is beneficial to reducing the floor space of the decay equipment and increasing the effective volume. The outlet of the sampling and monitoring pipeline is connected to the liquid inlet of each decay pool respectively, thereby avoiding the cross-flow of the radioactive waste liquid in each decay pool, ensuring that the radioactive waste liquid sampled from the decay pool will return to the decay pool where it was originally sampled, and will not enter the remaining decay pools to affect the total liquid volume and radioactivity concentration of the remaining decay pools, avoiding the mixing of waste liquids with different radioactive concentrations, and ensuring that sampling will not affect the decay cycle of the waste liquid in the decay pool.

[0012] Compared with the related technologies, the intelligent monitoring system for radioactive liquid waste provided by the utility model has the following beneficial effects:

[0013] The utility model provides an intelligent monitoring system for radioactive waste liquid. The radioactive waste liquid in the sedimentation tank is transported to the decay tank for decay treatment by a submersible sewage pump. The liquid in the decay tank is tested for radioactivity through a self-priming sewage pump via a sampling and monitoring pipeline. The waste liquid in the decay tank that meets the radioactivity test standard is discharged through a self-priming sewage pump via a drainage pipeline. The actions of liquid inletting into the sedimentation tank and the decay tank, sampling monitoring, and liquid discharge are completed. The liquid levels of the sedimentation tank and the decay tank are monitored in real time by a liquid level detector. The decay of the waste liquid in the decay tank is monitored by a sampling and monitoring pipeline. Intelligent monitoring of the entire process of collecting, controlling, sampling, monitoring, and discharging the radioactive waste liquid is realized, the work efficiency is improved, the risk of human operation is reduced, and the problems of low efficiency, large human resource consumption, and slow response speed in the current manual monitoring of radioactive waste liquid are effectively solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure of the intelligent monitoring system for radioactive liquid waste provided by an embodiment of the utility model;

[0015] Figure 2 A schematic diagram of the automatic control principle of the intelligent monitoring system for radioactive liquid waste provided in an embodiment of the utility model.

[0016] Figure numerals: 1. Sedimentation tank; 2. Decay tank; 3. Submersible sewage pump; 4. Self-priming sewage pump; 5. Liquid level detector; 6. Liquid inlet flowmeter; 7. Liquid discharge flowmeter; 8. First liquid inlet electric control valve; 9. Second liquid inlet electric control valve; 10. Pool discharge electric control valve; 11. Liquid discharge master control valve; 12. Sampling electric control valve; 13. Filter; 14. Radioactive activity detector; 15. Pressure regulating valve; 16. Manual sampling pipeline; 17. Check valve; 18. Inspection valve; 19. Flexible connection; 20. Radioactive waste liquid inlet; 21. Radioactive waste liquid discharge; 22. System pipeline; 23. PLC controller; 24. HMI touch screen; 25. PC desktop software. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0019] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] See also Figure 1The embodiment of the utility model provides an intelligent monitoring system for radioactive waste liquid, which comprises: two sedimentation tanks 1 arranged in parallel, including a main tank and a spare tank, for receiving radioactive waste liquid discharged from a pipeline; four decay tanks 2 arranged in parallel, the decay tank 2 being arranged on one side of the sedimentation tank 1, for decay treatment of radioactive waste liquid; six liquid level detectors 5, the six liquid level detectors 5 being respectively installed on the sedimentation tank 1 and the decay tank 2, for monitoring the liquid level of each tank body, the liquid level detector 5 being selected from any one of radar, ultrasonic, floating ball, immersion type, and pressure transmitter type liquid level gauges; the liquid outlets of the decay tanks 2 are respectively connected to the inlets of the sampling monitoring pipeline and the inlet of the discharge pipeline, and the outlets of the sampling monitoring pipeline are respectively connected to the liquid inlets of the four decay tanks 2 so that the sampling monitoring pipeline forms a circulation Loop; inlet flowmeter 6 and discharge flowmeter 7, the inlet flowmeter 6 is arranged on the inlet pipe of the decay pool 2, and the discharge flowmeter 7 is arranged on the radioactive waste liquid discharge port 21 of the discharge pipe, which are used to count the waste liquid inlet and discharge respectively; radioactivity detector 14, the radioactivity detector 14 is fixedly installed on the sampling monitoring pipeline, and the radioactivity detector 14 is used to monitor the radioactivity of the radioactive waste liquid; a pumping mechanism for pumping out the waste liquid, the pumping mechanism includes a submersible sewage pump 3, a self-priming sewage pump 4 and an electric control valve for controlling the opening and closing of the pipeline, the submersible sewage pump 3 is arranged in the sedimentation tank 1 to pump the precipitated waste liquid into the decay pool 2, and the self-priming sewage pump 4 is arranged on the outlet pipe of the decay pool 2, which is used to transport the sampled liquid and the liquid that meets the discharge standards. It is preferred to set up two self-priming sewage pumps 4, one for backup and one for use.

[0021] Furthermore, the electric control valves for opening and closing the control pipeline include a first liquid inlet electric control valve 8, a second liquid inlet electric control valve 9, a pool liquid discharge electric control valve 10, a liquid discharge master control valve 11 and a sampling electric control valve 12. The first liquid inlet electric control valve 8 is arranged on the liquid inlet pipeline of the sedimentation tank 1 to ensure free switching between the main pool and the standby pool of the sedimentation tank; the second liquid inlet electric control valve 9 is arranged on the liquid inlet pipeline of the decay pool 2, and the pool liquid discharge electric control valve 10 is arranged on the liquid outlet pipeline of the decay pool 2 to ensure independent flow of liquid in each decay pool; the liquid discharge master control valve 11 is arranged on the liquid discharge pipeline to ensure control of the liquid discharge flow direction; the sampling electric control valve 12 is arranged on the sampling monitoring pipeline to ensure control of the liquid sampling flow direction.

[0022] Furthermore, a filter 13 is provided on the sampling monitoring pipeline, and the filter 13 is used to filter impurities and reduce foreign matter entering the radioactivity detector 14. The filter 13 provided on the sampling monitoring pipeline effectively reduces the impact of impurities and foreign matter on the radioactivity detector 14, thereby improving the accuracy of the monitoring data.

[0023] Furthermore, the present embodiment is also provided with a manual sampling pipeline 16 to allow the operator to manually sample the radioactive waste liquid in each decay pool. The manual sampling pipeline 16 is connected in parallel with the sampling monitoring pipeline, and a pressure regulating valve 15 is provided on the sampling monitoring pipeline. The manual sampling operation steps are as follows: sequentially open the second liquid inlet electric control valve 9, the pool discharge electric control valve 10 and the sampling electric control valve 12 corresponding to the decay pool 2 to be manually sampled, ensure that the discharge master control valve 11 and the second liquid inlet electric control valves and pool discharge electric control valves of the remaining decay pools are all in a closed state, start the self-priming sewage pump 4, and after running for a few minutes, adjust the pressure regulating valve 15, and the manual sampling pipeline 16 can be manually sampled when liquid is discharged. The present embodiment adjusts the pressure on the sampling pipeline by the pressure regulating valve so that liquid can be discharged from the manual sampling pipeline for manual sampling, avoiding the traditional method of reserving sampling ports for each pool and manually opening the bulky pool cover for sampling, saving the labor cost of the sampling process, and reducing the risk of radiation exposure to the sampling personnel.

[0024] In this embodiment, the sedimentation tank 1 is designed to be used alternately as the main tank and the standby tank, which can avoid abnormal conditions such as equipment failure, retrieval, cleaning, etc. in the sedimentation tank, which may affect the normal operation of the system; according to the decay characteristics, the decay tank 2 must be designed with more than two tanks, one tank is used for the physical decay of radioactive waste liquid, and the other tank is used for the collection of radioactive waste liquid. The more decay tanks there are, the more conducive it is to reduce the floor space and increase the effective volume; in this embodiment, the decay tank 2 is set to four, and is set in a multi-stage parallel relationship, which is not only conducive to reducing the floor space of the decay equipment and increasing the effective volume, but also in this embodiment, the liquid inlet of each decay tank is connected to the outlet of the sampling and monitoring pipeline respectively, which avoids the cross-flow of radioactive waste liquid in each decay tank, affecting the detection of the total liquid volume and radioactivity concentration of the radioactive waste liquid in each decay tank. A check valve 17 is provided on the connecting pipeline between the sedimentation tank 1 and the decay tank 2 to prevent the waste liquid from flowing back.

[0025] Furthermore, the intelligent monitoring system provided in this embodiment can also realize automatic control of the monitoring system through a PLC control system. Figure 2A PLC controller 23 is installed in the control room. The PLC controller 23 is connected to the first liquid inlet electric control valve 8, the second liquid inlet electric control valve 9, the pool discharge electric control valve 10, the discharge master control valve 11, the sampling electric control valve 12, the submersible sewage pump 3, the liquid level detector 5, the liquid inlet flow meter 6, the liquid discharge flow meter 7, the self-priming sewage pump 4, and the radioactive activity detector 14 through cables. The PLC controller 23 controls the opening and closing of each electric control valve and the start and stop of the submersible sewage pump 3 and the self-priming sewage pump 4 according to the monitoring data fed back by the data acquisition device (liquid level detector 5, radioactive activity detector 14). Closed to achieve automatic extraction and flow control of waste liquid; preferably, the present embodiment is also provided with an HMI touch screen 24 and a PC desktop software 25, which are installed at the workstation and connected to the PLC controller 23 through a network for remote monitoring and management system. It should be noted that the circuits, electronic components and modules involved in the present embodiment are all prior art, and the power connection methods of the various electrical equipment involved are existing mature technologies, which can be fully realized by those skilled in the art. Needless to say, the content protected by the present utility model does not involve improvements to the software and methods.

[0026] The working principle of the intelligent monitoring system for radioactive liquid waste provided in this embodiment is as follows:

[0027] Waste liquid collection and sedimentation: radioactive waste liquid enters the sedimentation tank 1 through the radioactive waste liquid inlet 20 (when the main tank reaches the set full liquid level or needs maintenance, the first liquid inlet electric control valve 8 corresponding to the main tank is closed, and the first liquid inlet electric control valve 8 corresponding to the backup tank is opened, and the backup tank is activated); the liquid level detector 5 continuously monitors the liquid level of the sedimentation tank 1 to ensure that the waste liquid is within the set liquid level safety range; the submersible sewage pump 3 (of a cutting type) pumps the precipitated waste liquid to the first decay tank. When the first decay tank reaches the set full liquid level, the second liquid inlet electric control valve on the liquid inlet pipeline of the first decay tank is closed, and the second liquid inlet electric control valve on the liquid inlet pipeline of the second decay tank is opened, and the waste liquid enters the second decay tank; and so on, the waste liquid is pumped into each decay tank in turn; the flow meter 6 records the amount of waste liquid entering all decay tanks.

[0028] Decay treatment: The waste liquid is decayed in the decay pool 2; the liquid level detector 5 also monitors the liquid level of the decay pool 2 to ensure that the waste liquid is within a safe range; when the radioactive waste liquid in the decay pool 2 reaches a preset liquid level, the PLC controller 23 starts timing the decay time.

[0029] Automatic sampling and monitoring: After the preset decay time is reached, the PLC controller 23 controls the second liquid inlet electric control valve 9, the pool discharge electric control valve 10 and the sampling electric control valve 12 corresponding to the decay pool 2 to be sampled to open, ensuring that the discharge master control valve 11 and the second liquid inlet electric control valves and pool discharge electric control valves of the remaining decay pools are in a closed state, and starts the self-priming sewage pump 4 to allow the liquid in the decay pool 2 to be sampled to enter the sampling monitoring pipeline for sampling operation; the sampled waste liquid passes through the filter 13 (such as a Y-type filter, a backwash filter, a self-cleaning filter, etc.) to remove impurities and reduce foreign matter entering the radioactive activity detector 14; the radioactive activity detector 14 monitors the radioactive activity of the sampled waste liquid.

[0030] Determination and discharge: The PLC controller 23 determines whether the waste liquid meets the standard according to the detection result of the radioactive activity detector 14. If not, the waste liquid continues to decay in the decay pool for a predetermined time; if the radioactive activity of the waste liquid meets the preset standard, the PLC controller 23 controls the corresponding pool drain electric control valve 10 and the drain master control valve 11 of the decay pool 2 to be discharged to open, and starts the self-priming sewage pump 4 to discharge the qualified waste liquid through the radioactive waste liquid discharge port 21 of the discharge pipeline; during the discharge process, the discharge flowmeter 7 records the discharge volume.

[0031] The system is also provided with a manual sampling pipeline 16, allowing the operator to manually collect radioactive waste liquid samples from each pool for further testing or analysis.

[0032] If a problem occurs during the automatic detection or discharge process, the operator can remotely monitor and manage the system through the HMI touch screen 24 or PC desktop software 25 to make necessary interventions and adjustments; the inspection valve 18 allows the system to be inspected and maintained when necessary.

[0033] In summary, the intelligent monitoring system for radioactive liquid waste provided in this embodiment can complete the actions of liquid filling into the sedimentation tank, liquid filling into the decay tank, sampling and detection of the decay tank, and liquid discharge from the decay tank, thereby reducing the risk of human operation and effectively solving the current problems of low efficiency, high human resource consumption, and slow response speed in manual monitoring of radioactive liquid waste.

[0034] It is understandable that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit the protection scope of the utility model. Obviously, the described embodiments are only some embodiments of the utility model, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the utility model according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the utility model in essence, and these technical solutions also belong to the scope of protection of the utility model.

Claims

1. An intelligent monitoring system for radioactive waste liquid, characterized in that: It includes a sedimentation tank, a decay tank arranged behind the sedimentation tank, and a pumping mechanism for pumping out radioactive waste liquid. Liquid level detectors are installed on the sedimentation tank and the decay tank. The liquid outlet of the decay tank is respectively connected with the inlet of a sampling and monitoring pipeline and the inlet of a drainage pipeline. The sampling and monitoring pipeline is provided with a radioactive activity detector, and the outlet of the sampling and monitoring pipeline is connected with the liquid inlet of the decay tank; a liquid inlet flowmeter is provided on the liquid inlet pipeline of the decay tank, and a liquid discharge flowmeter is provided on the liquid discharge pipeline; the pumping mechanism includes a submersible sewage pump, a self-priming sewage pump and an electrically controlled valve for controlling the opening and closing of the pipeline. The submersible sewage pump is arranged in the sedimentation tank, and the self-priming sewage pump is arranged on the liquid outlet pipeline of the decay tank.

2. The intelligent monitoring system for radioactive liquid waste according to claim 1 is characterized in that: The electric-controlled valve includes a first liquid inlet electric-controlled valve, a second liquid inlet electric-controlled valve, a pool liquid discharge electric-controlled valve, a liquid discharge master control valve and a sampling electric-controlled valve. The first liquid inlet electric-controlled valve is arranged on the liquid inlet pipe of the sedimentation tank, the second liquid inlet electric-controlled valve is arranged on the liquid inlet pipe of the decay tank, the pool liquid discharge electric-controlled valve is arranged on the liquid outlet pipe of the decay tank, the liquid discharge master control valve is arranged on the liquid discharge pipeline, and the sampling electric-controlled valve is arranged on the sampling monitoring pipeline.

3. The intelligent monitoring system for radioactive liquid waste according to claim 1 is characterized in that: The sampling monitoring pipeline is provided with a filter.

4. The intelligent monitoring system for radioactive liquid waste according to claim 1 is characterized in that: An artificial sampling pipeline is provided, the artificial sampling pipeline is connected in parallel with the sampling monitoring pipeline, and a pressure regulating valve is provided on the sampling monitoring pipeline.

5. The intelligent monitoring system for radioactive liquid waste according to claim 1 is characterized in that: The number of the sedimentation tanks is at least two, and the sedimentation tanks are arranged in parallel in multiple stages.

6. The intelligent monitoring system for radioactive liquid waste according to claim 1 is characterized in that: The number of the decay cells is at least two, and the decay cells are arranged in multiple stages in parallel. The outlet of the sampling and monitoring pipeline is respectively connected to the liquid inlet of each decay cell.

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