Automatic radioactive waste liquid treatment device and construction method

Abstract

The application provides a radioactive waste liquid automatic processing device and method, which comprises a plurality of decay tanks, the two ends of the decay tanks are connected with liquid inlet pipes and liquid outlet pipes respectively, liquid level sensors are arranged in the decay tanks; liquid inlet valves are arranged on the liquid inlet pipes, liquid outlet valves are arranged on the liquid outlet pipes; a main control device is further arranged, a timing module is electrically connected with the main control device, the liquid level sensors are electrically connected with the input end of the main control device, and the output end of the main control device is electrically connected with the liquid inlet valves and the liquid outlet valves; the main control device is used for controlling the liquid inlet valves to be opened, so that the radioactive waste liquid enters the decay tanks, the liquid level sensors are used for detecting the liquid level in the decay tanks, and after the decay tanks are filled, feedback signals are fed back to the main control device to control the liquid inlet valves to be closed; the timing module is used for timing, and after the radioactive waste liquid in the decay tanks is stored for a time period reaching a preset half-life, feedback signals are fed back to the main control device to control the liquid outlet valves to be opened to discharge the radioactive waste liquid. The application can be arranged in a building, occupies a small space, and saves volume.

Description

Technical Field

[0001] The present invention relates to the field of mechanized equipment for bridge construction, and in particular to an automatic treatment device for radioactive liquid waste and a construction method. Background Art

[0002] Currently, radioactive elements are widely used in military, energy, industry, agriculture, medicine, and other scientific research applications. However, the amount of radioactive waste gas, liquid, and solid waste generated throughout the development and utilization process is also increasing. Among the "three radioactive wastes," radioactive wastewater requires treatment. In the medical field, radioactive wastewater refers to wastewater discharged by hospitals after the use of nuclear elements for diagnosis or treatment. It is categorized by the concentration of radioactive wastewater into high-level, intermediate-level, and low-level radioactive wastewater. It is further categorized by the type of radiation contained in the wastewater into three types: α, β, and γ. Radioactive wastewater is characterized by a high concentration of heavy metals, radioactivity, and significant hazards to humans and animals. Therefore, radioactive wastewater must be properly treated to reduce its radioactivity to below nationally prescribed safety limits before it can be discharged into water bodies or urban sewers. According to the "Radiation Protection and Safety Requirements for Nuclear Medicine" issued by the Ministry of Ecology and Environment in 2021, nuclear medicine workplaces should be equipped with trough-type or plug-flow radioactive waste decay pools or dedicated containers to collect radioactive waste generated within the facility and from cleaning during emergency response. Radioactive liquid waste collected in decay pools or special containers should be stored until it meets discharge requirements.

[0003] Currently, the most common method for storing wastewater is the radioactive decay pool, which can be categorized as either a trough or plug-flow type. A trough decay pool employs intermittent discharge from multiple compartments, typically consisting of four compartments arranged in parallel. Each compartment is designed to hold 50% of the total discharge volume for 10 half-lives of the longest-lived isotope, effectively storing five half-lives of radioactive wastewater. A solenoid valve is installed on the inlet pipe, and the effluent is pressure-discharged by a submersible pump. Each compartment is designed with a liquid level line, and four compartments are used sequentially. Once the wastewater in the compartment has exceeded 10 half-lives and meets monitoring standards, the corresponding submersible pump is activated for discharge. The advantages of decay pools are strong shock resistance and stable, reliable effluent quality. However, their disadvantages are their large volume, footprint, high cost, and the need for control valves and pumps, making control relatively complex. A plug-flow decay pool features continuous inlet and outlet, internal diversion walls, and plug-flow discharge. The total designed volume of the decay pool is equivalent to the total discharge volume of 10 half-lives of the longest-half-life isotope. Each pool uses a draft tube, with wastewater entering from the bottom and discharging from the top, to prevent short-circuiting and ensure efficient decay. Plug-flow decay pools offer advantages such as small volume, minimal footprint, low cost, simple operation, and minimal or no maintenance. However, they have the disadvantage of poor shock resistance. If a large volume of radioactive wastewater is discharged, the radioactive material in the wastewater increases, and the wastewater must be discharged before it has decayed to the permitted discharge concentration in the decay pool, potentially causing a radioactive contamination accident. Both methods require excavation of buildings to create ponds, making them unsuitable for laboratories located in buildings. For example, phosphorus-32 has a half-life of approximately 14.3 days, so 10 half-lives would require 143 days. In applications where large quantities of nuclear medicine elements are used, the treatment of medical nuclear wastewater requires significant storage space, resulting in very high storage costs. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide an automatic radioactive waste treatment device and construction method that can meet the requirements for attenuation and storage of radioactive waste in high-rise buildings, allowing the waste to be discharged after storage and attenuation, thereby preventing radiation contamination of the environment. Preferably, this device can reduce the storage space required for radioactive waste, meeting the demand for large quantities of elements used in nuclear medicine.

[0005] To solve the above technical problems, the technical solution of the present invention is: an automatic radioactive waste liquid treatment device, comprising a plurality of decay tanks, both ends of which are connected to a liquid inlet pipe and a liquid outlet pipe respectively, and a liquid level sensor is provided in the decay tank;

[0006] A liquid inlet valve is provided on the liquid inlet pipe, and a liquid discharge valve is provided on the liquid discharge pipe;

[0007] A main control device is also provided, the timing module is electrically connected to the main control device, the liquid level sensor is electrically connected to the input end of the main control device, and the output end of the main control device is electrically connected to the liquid inlet valve and the liquid discharge valve;

[0008] The main control device is used to control the opening of the liquid inlet valve to allow the radioactive waste liquid to enter the decay tank. The liquid level sensor is used to detect the liquid level in the decay tank. After the decay tank is full, the feedback signal causes the main control device to control the closing of the liquid inlet valve. The timing module is used to time, and after the storage time of the radioactive waste liquid in the decay tank reaches the preset half-life time, the feedback signal causes the main control device to control the opening of the liquid discharge valve to discharge the radioactive waste liquid.

[0009] In a preferred solution, the decay tanks are divided into multiple groups, and each group of decay tanks corresponds to a liquid inlet pipe, so that the decay tanks can treat multiple types of radioactive waste liquids in parallel.

[0010] In a preferred embodiment, the decay tank has a cylindrical structure with end covers at both ends. The decay tank comprises an outer tank body, a tank body radiation isolation layer, and an inner tank body from the outside to the inside, and the end covers comprise an outer end cover, an end cover radiation isolation layer, and an inner end cover from the outside to the inside.

[0011] The outer tank body, inner tank body, outer end cover and inner end cover are made of stainless steel, and the radiation isolation layer of the tank body and the radiation isolation layer of the end cover are made of boron-containing polyethylene;

[0012] The decay tanks are arranged vertically.

[0013] In a preferred embodiment, the structure of the end cap is as follows: the length of the inner tank body is shorter than the length of the radiation isolation layer of the tank body, the inner tank body forms a stepped structure, the outer diameter of the inner end cap is the same as the outer diameter of the inner tank body, and the inner end cap contacts the end surface of the inner tank body;

[0014] The outer diameter of the end cover radiation isolation layer is the same as the outer diameter of the inner tank body, and the end cover radiation isolation layer contacts the tank body radiation isolation layer and forms a seal;

[0015] The outer end cover is provided with a circular step, the step of the outer end cover is located in the inner circle of the radiation isolation layer of the tank body, the edge of the outer end cover covers the end face of the outer tank body, and is fixedly connected to the end face of the outer tank body.

[0016] In a preferred solution, the structure of the end cover is as follows: the liquid level sensor is arranged on the end cover at the top end of the decay tank, and a pressure exhaust valve is also provided on the end cover.

[0017] In a preferred embodiment, the top end cap of the decay tank is connected to the liquid inlet pipe, and the bottom end cap of the decay tank is connected to the liquid discharge pipe;

[0018] A radiation sensor is provided on the liquid discharge pipe and is electrically connected to the input end of the main control device.

[0019] In a preferred embodiment, the top end cap of the decay tank is connected to the liquid inlet pipe, and the bottom end cap of the decay tank is connected to the liquid discharge pipe;

[0020] A conductivity sensor is provided on the liquid discharge pipe, and the conductivity sensor is electrically connected to the input end of the main control device.

[0021] In a preferred embodiment, a pump is provided on the drainage pipe connected to each decay tank, the outlet of the pump is connected to the inlet of the circulation pipe, the circulation pipe is buried in the decay tank, and the outlet of the circulation pipe is connected to the inner cavity of the decay tank; the pump is electrically connected to the output end of the main control device.

[0022] In a preferred solution, a heating device is further provided in the decay tank, and the heating device is electrically connected to the output end of the main control device;

[0023] The decay tank is also provided with a negative pressure pipe for evacuating the decay tank;

[0024] The main control device controls the heating device to heat the liquid in the decay tank and evacuate the tank to concentrate the radioactive waste liquid in the decay tank.

[0025] In a preferred solution, a heating device is further provided in the decay tank, and the heating device is electrically connected to the output end of the main control device;

[0026] The decay tank is also provided with a negative pressure pipe for evacuating the decay tank;

[0027] The main control device controls the heating device to heat the liquid in the decay tank and evacuate the tank to concentrate the radioactive waste liquid in the decay tank.

[0028] In a preferred embodiment, an electric-driven filtering device is provided near the top of the decay tank, and the wires of the electric-driven filtering device are led out of the decay tank so that the electric-driven filtering device can filter the radioactive substances in the radioactive waste liquid, so that the radioactive waste liquid in the decay tank is discharged to the drain pipe through the delivery pipe after filtering.

[0029] In a preferred embodiment, the structure of the electric-driven filtering device is as follows: the electric-driven filtering device is provided with an anode electrode, a cathode electrode, a working screen, and at least one of an anode membrane or a cathode membrane;

[0030] The working separator is arranged between the anode membrane or cathode membrane and the cathode electrode, or the working separator is arranged between the anode membrane and the cathode membrane.

[0031] In a preferred embodiment, the structure of the electrically driven filtration device is as follows: an anode electrode, an anode membrane, a cathode membrane, and a cathode electrode are sequentially arranged in the decay tank along the flow direction of the radioactive waste liquid; a working screen is also provided, the working screen is arranged between the anode membrane and the cathode membrane, and has multiple mesh holes for allowing liquid to pass through and generating resistance to the flow of the liquid; a terminal screen is further provided after the cathode electrode, and the mesh holes of the terminal screen are smaller than the mesh holes of the working screen to generate greater resistance to the flow of the liquid, forming a dilution zone before the terminal screen and a concentration zone after the terminal screen;

[0032] The membrane cavity between the anode membrane and the cathode membrane is connected to the concentration zone through the concentration tube;

[0033] The dilution zone is connected with the discharge pipe through a delivery pipe, and a discharge valve is provided on the delivery pipe.

[0034] In a preferred embodiment, a filter layer is further provided upstream of the anode electrode;

[0035] A working separator is provided between the anode electrode and the anode membrane;

[0036] A working separator is provided between the cathode membrane and the cathode electrode;

[0037] A skeleton ring is provided in the membrane cavity of the cathode membrane and the anode membrane, and the delivery pipe is connected to the skeleton ring;

[0038] The edges of the working partition and the terminal partition form a seal with the inner wall of the inner tank;

[0039] The outer wall of the decay tank is divided into two sections along the axial direction, and the two sections are fixedly connected by a flange ring.

[0040] A control method using the above-mentioned automatic radioactive waste liquid treatment device comprises the following steps:

[0041] S1. The main control device or manual control liquid inlet valve is opened, and the radioactive waste liquid enters the decay tank;

[0042] S2, after the liquid level sensor detects that the liquid in the decay tank reaches the preset height, the liquid inlet valve is closed;

[0043] S3. The timing module starts timing. When the storage time meets the preset half-life time, the drain valve is opened to drain the liquid.

[0044] A control method using the above-mentioned automatic radioactive waste liquid treatment device comprises the following steps:

[0045] S01. The type of radioactive waste liquid is set in the main control device, and the liquid inlet valve of the decay tank corresponding to the type of radioactive waste liquid is opened, and the radioactive waste liquid enters the corresponding decay tank;

[0046] S02, after the liquid level sensor detects that the liquid in the decay tank has reached a preset height, the liquid inlet valve is closed;

[0047] S03. The timing module starts timing. When the storage time meets the preset half-life time of the current type of radioactive waste liquid, the drain valve is opened to drain the liquid.

[0048] In a preferred solution, during the storage process, the heating device provided in the decay tank is started; the water vapor generated by the heating is discharged from the pressure exhaust valve or discharged along with the vacuum pumping of the negative pressure pipe to concentrate the radioactive waste liquid.

[0049] In the preferred scheme, the electrically-driven filtering device is arranged in the decay tank, during storage, the main control device supplies power to the wire, so that the radioactive elements in the radioactive waste liquid can pass through the anode film or the cathode film and enter the concentration area in the decay tank; the dilution area of the electrically-driven filtering device can deliver the liquid in the dilution area to the liquid discharge pipe through the delivery pipe.

[0050] In the preferred scheme, the delivery pipe is also in communication with the inlet of the pump;

[0051] The liquid in the liquid discharge pipe is detected in terms of electric conductivity and / or radioactivity, if the standard is met, the liquid can be directly discharged; if the standard is not met, the pump is started to deliver the liquid in the delivery pipe to the upstream of the electrically-driven filtering device through the circulating pipe, or the liquid discharge valve on the delivery pipe is closed.

[0052] In the preferred scheme, before discharging, the pump is started to circulate the liquid in the decay tank through the circulating pipe for a period of time, so that the radioactive waste liquid to be discharged can be homogenized, and the radiation sensor or the electric conductivity sensor on the liquid discharge pipe can detect the decay of the radioactive waste liquid.

[0053] The radioactive waste liquid automatic processing device and method provided by the application have the following advantages:

[0054] 1、The radioactive waste liquid automatic processing device and method can ensure that the discharged waste liquid is no longer radioactive, and has small space occupation and saves volume. The device can be arranged in a building to meet the needs of high-level laboratories.

[0055] 2、The device has a concentration function, can store the radioactive waste liquid after being concentrated, further improves the utilization rate of the storage space, and improves the impact resistance.

[0056] 3、The device adopts the electrically-driven filtering scheme, which can further improve the utilization rate of the storage space.

[0057] 4、The device has a detection function, which can avoid discharging the radioactive waste liquid that does not meet the requirements. To ensure the accuracy of detection, the device adopts the circulating homogenization scheme to ensure the processing effect. DETAILED DESCRIPTION

[0058] The application will be further described below in combination with the drawings and examples:

[0059] Figure 1 It is a front view of the overall structure of the application.

[0060] Figure 2 It is a partial structure sectional view of the decay tank of the application.

[0061] Figure 3 It is a partial structure sectional view of the end cover of the decay tank of the application.

[0062] Figure 4 It is a partial cross-sectional view of the upper structure and the electric-driven filtering device of the present invention.

[0063] Figure 5 It is a structural schematic diagram of the electric drive filtering device of the present invention.

[0064] Figure 6 It is a schematic diagram of the arrangement structure of the anode membrane or cathode membrane of the present invention.

[0065] Figure 7 This is a control structure block diagram of the present invention.

[0066] In the figure: liquid inlet pipe 1, liquid inlet valve 2, decay tank 3, outer end cover 31, end cover radiation isolation layer 32, inner end cover 33, outer tank body 34, tank body radiation isolation layer 35, inner tank body 36, flange ring 37, base 4, pump 5, circulation pipe 51, pressure valve 52, discharge valve 6, discharge pipe 7, radiation sensor 8, electric drive filter device 9, wire 901, filter layer 902, anode electrode 903, working screen 904, anode membrane 905, concentration pipe 906, cathode membrane 907, cathode electrode 908, terminal screen 909, dilution area 910, delivery pipe 911, skeleton ring 912, concentration area 913, liquid level sensor 10, pressure exhaust valve 11, main control device 12, timing module 13. DETAILED DESCRIPTION

[0067] Example 1:

[0068] like Figure 1 As shown in , an automatic radioactive waste liquid treatment device includes a plurality of decay tanks 3, both ends of the decay tanks 3 are connected to a liquid inlet pipe 1 and a liquid discharge pipe 7, and a liquid level sensor 10 is provided in the decay tank 3;

[0069] A liquid inlet valve 2 is provided on the liquid inlet pipe 1, and a liquid discharge valve 6 is provided on the liquid discharge pipe 7;

[0070] like Figure 7 As shown in , a main control device 12 is also provided, the timing module 13 is electrically connected to the main control device 12, the liquid level sensor 10 is electrically connected to the input end of the main control device 12, and the output end of the main control device 12 is electrically connected to the liquid inlet valve 2 and the liquid discharge valve 6; preferably, the main control device 12 adopts a PLC controller.

[0071] The master control device 12 is used to control the opening of the liquid inlet valve 2, so that the radioactive waste liquid enters the decay tank 3, the liquid level sensor 10 is used to detect the liquid level in the decay tank 3, and after the decay tank 3 is filled, the feedback signal makes the master control device 12 control the liquid inlet valve 2 to be closed, the timing module 13 is used for timing, and when the storage time of the radioactive waste liquid in the decay tank 3 reaches the preset half-life length, the feedback signal makes the master control device 12 control the liquid outlet valve 6 to be opened to discharge the radioactive waste liquid. By the structure, the automation control of the waste liquid discharge is realized, and the probability of manual operation failure is reduced.

[0072] Embodiment 2:

[0073] The preferred scheme is shown in Figure 1 The decay tank 3 is divided into multiple groups, and each group of decay tanks 3 corresponds to one liquid inlet pipe 1, so that the decay tank 3 can dispose multiple radioactive waste liquids in parallel.

[0074] The preferred scheme is shown in Figure 2 The structure of the decay tank 3 is that the decay tank 3 is a cylindrical structure, end covers are arranged at both ends of the decay tank 3, the decay tank 3 is provided with an outer tank body 34, a tank radiation isolation layer 35 and an inner tank body 36 from outside to inside, and the end cover is provided with an outer end cover 31, an end cover radiation isolation layer 32 and an inner end cover 33 from outside to inside.

[0075] The outer tank body 34, the inner tank body 36, the outer end cover 31 and the inner end cover 33 are made of 306 stainless steel, and the tank radiation isolation layer 35 and the end cover radiation isolation layer 32 are made of boron-containing polyethylene.

[0076] The decay tank 3 is vertically arranged. Preferably, the decay tank 3 adopts a cylindrical structure, and the length is 2-10 times the diameter. By the structure, the space height in the room can be fully utilized, and more radioactive waste liquids can be stored in a small space.

[0077] The preferred scheme is shown in Figure 2 , 3 The structure of the end cover is that the length of the inner tank body 36 is shorter than the length of the tank radiation isolation layer 35, the inner tank body 36 forms a stepped structure, the outer diameter of the inner end cover 33 is the same as that of the inner tank body 36, and the inner end cover 33 is in contact with the end face of the inner tank body 36.

[0078] The outer diameter of the end cover radiation isolation layer 32 is the same as that of the inner tank body 36, and the end cover radiation isolation layer 32 is in contact with the tank radiation isolation layer 35 and constitutes a seal.

[0079] The outer end cover 31 is provided with a circular step, the step of the outer end cover 31 is located in the inner circle of the tank radiation isolation layer 35, the edge of the outer end cover 31 covers the end face of the outer tank body 34, and is fixedly connected with the end face of the outer tank body 34. By the above structure, the radiation resistance effect is ensured, and the strength of the whole tank body can be ensured.

[0080] The preferred solution is Figure 3 As shown in FIG, the end cap structure is as follows: a liquid level sensor 10 is mounted on the top end cap of the decay tank 3, and a pressure exhaust valve 11 is also provided on the end cap. The liquid level sensor 10 is used to detect the level of the radioactive waste liquid in the decay tank 3. The pressure exhaust valve 11 is used to discharge pressurized gas to prevent high pressure from being generated in the decay tank 3 due to temperature changes.

[0081] Example 3:

[0082] The preferred solution is Figure 1 As shown in , the top end cover of the decay tank 3 is connected to the liquid inlet pipe 1, and the bottom end cover of the decay tank 3 is connected to the liquid discharge pipe 7;

[0083] A radiation sensor 8 is installed on the drainage pipe 7 and is electrically connected to the input terminal of the main control device 12. This structure can prevent the discharge of radioactive waste liquid that does not meet treatment requirements. Radiation sensor 8 is a Geiger-Müller counter, scintillation detector, or semiconductor detector.

[0084] Example 4:

[0085] In the preferred embodiment, the top end cover of the decay tank 3 is connected to the liquid inlet pipe 1, and the bottom end cover of the decay tank 3 is connected to the liquid discharge pipe 7;

[0086] A conductivity sensor is provided on the drainage pipe 7 and is electrically connected to the input terminal of the main control device 12. The conductivity sensor is located in the position of the radiation sensor 8. The conductivity sensor is used to monitor the conductivity changes of the inlet and outlet water in real time to evaluate the treatment effect.

[0087] Example 5:

[0088] The preferred solution is Figure 1 、 2 As shown in FIG, a pump 5 is installed on the drainage pipe 7 connected to each decay tank 3. The outlet of the pump 5 is connected to the inlet of a circulation pipe 51, which is buried within the decay tank 3 and communicates with the inner cavity of the decay tank 3. The pump 5 is also electrically connected to the output of the main control device 12. This structure homogenizes the radioactive waste liquid, preventing errors in test data. Furthermore, the pump 5 can recirculate unqualified radioactive waste liquid back to the decay tank 3 for further treatment.

[0089] Example 6:

[0090] In a preferred solution, a heating device is further provided in the decay tank 3 , and the heating device is electrically connected to the output end of the main control device 12 ; preferably, the heating device is a resistive heating device.

[0091] A negative pressure pipe is also provided near the top of the decay tank 3 to evacuate the decay tank 3;

[0092] The main control device 12 controls the heating device to heat the liquid in the decay tank 3 and evacuate the liquid to concentrate the radioactive waste liquid in the decay tank 3. The combination of evacuation and heating can greatly improve the concentration efficiency.

[0093] Example 7:

[0094] The preferred solution is Figures 4-6 As shown in FIG, an electrically driven filter device 9 is further provided near the top of the decay tank 3. A wire 901 of the electrically driven filter device 9 is led out of the decay tank 3 so that the electrically driven filter device 9 filters radioactive substances from the radioactive waste liquid, concentrating the radioactive waste liquid in the decay tank 3. The filtered liquid is then discharged to the drain pipe 7 through a delivery pipe 911. This structure further improves the concentration efficiency.

[0095] The preferred solution is Figures 5 and 6 As shown in FIG, the structure of the electric-driven filtering device 9 is as follows: the electric-driven filtering device 9 is provided with an anode electrode 903, a cathode electrode 908, and a working screen 904, and is further provided with at least one of an anode membrane 905 and a cathode membrane 907;

[0096] The working screen 904 is disposed between the anode membrane 905 or the cathode membrane 907 and the cathode electrode 908 , or the working screen 904 is disposed between the anode membrane 905 and the cathode membrane 907 .

[0097] In a preferred embodiment, the structure of the electrically driven filtration device 9 is as follows: an anode electrode 903, an anode membrane 905, a cathode membrane 907, and a cathode electrode 908 are sequentially arranged in the decay tank 3 along the flow direction of the radioactive waste liquid. A working screen 904 is also provided. The working screen 904 is arranged between the anode membrane 905 and the cathode membrane 907. The working screen 904 has multiple mesh holes for allowing liquid to pass through and generating resistance to the flow of the liquid. A terminal screen 909 is further provided after the cathode electrode 908. The mesh holes of the terminal screen 909 are smaller than the mesh holes of the working screen 904 to generate greater resistance to the flow of the liquid. A dilution zone 910 is formed before the terminal screen 909, and a concentration zone 913 is formed after the terminal screen 909.

[0098] The membrane cavity between the anode membrane 905 and the cathode membrane 907 is connected to the concentration zone 913 through the concentration tube 906;

[0099] The dilution zone 910 is connected to the drain pipe 7 through a delivery pipe 911, and a drain valve is provided on the delivery pipe 911. The liquid in the dilution zone 910 meets the discharge standard after treatment and is discharged after testing.

[0100] The preferred solution is Figure 5As shown in FIG, a filter layer 902 is further provided upstream of the anode electrode 903;

[0101] A working screen 904 is provided between the anode electrode 903 and the anode membrane 905;

[0102] A working screen 904 is provided between the cathode membrane 907 and the cathode electrode 908;

[0103] A skeleton ring 912 is provided in the membrane cavity of the cathode membrane 907 and the anode membrane 905, and a delivery pipe 911 is connected to the skeleton ring 912;

[0104] The edges of the working screen 904 and the terminal screen 909 form a seal with the inner wall of the inner tank 36;

[0105] In the electrically driven filtration device 9, selecting the appropriate membrane material is crucial. Anode membrane 905 preferably uses a polymer modified with sulfonic acid groups, such as sulfonated polyphenylene ether (SPE) or sulfonated polysulfone (SPSU). Cathode membrane 907 preferably uses a polymer modified with quaternary ammonium salt groups, such as quaternized polyacrylonitrile (QPA).

[0106] The outer wall of the decay tank 3 is divided into two sections along the axial direction, and the two sections are fixedly connected by a flange ring 37. The consumables of the electric drive filter device 9 need to be collected and processed separately.

[0107] Example 8:

[0108] A control method using the above-mentioned automatic radioactive waste liquid treatment device comprises the following steps:

[0109] S1, the main control device or manual control liquid inlet valve 2 is opened, and the radioactive waste liquid enters the decay tank 3;

[0110] S2, after the liquid level sensor 10 detects that the liquid in the decay tank 3 reaches a preset height, the liquid inlet valve 2 is closed;

[0111] S3, the timing module 13 starts timing, and when the storage time meets the preset half-life time, the drain valve 6 is opened to drain the liquid.

[0112] Example 9:

[0113] A control method using the above-mentioned automatic radioactive waste liquid treatment device comprises the following steps:

[0114] S01. The type of radioactive waste liquid is set in the main control device, and the liquid inlet valve 2 of the decay tank 3 corresponding to the type of radioactive waste liquid is opened, and the radioactive waste liquid enters the corresponding decay tank 3;

[0115] S02, after the liquid level sensor 10 detects that the liquid in the decay tank 3 reaches a preset height, the liquid inlet valve 2 is closed;

[0116] S03, the timing module 13 starts timing, and when the storage time meets the preset half-life time of the current type of radioactive waste liquid, the drain valve 6 is opened to drain the liquid.

[0117] Example 10:

[0118] In a preferred solution, during storage, the heating device within the decay tank 3 is activated; the water vapor generated by heating is discharged through the pressure exhaust valve 11 or through vacuum extraction through the negative pressure pipe, thereby concentrating the radioactive waste liquid. This concentrated radioactive waste liquid can significantly reduce storage space. This solution is particularly suitable for applications with limited space. Preferably, the heating temperature is below the boiling point to prevent splashing during discharge.

[0119] Example 11:

[0120] In a preferred embodiment, an electrically driven filter device 9 is provided in the decay tank 3. During storage, the main control device supplies power to the wire 901, allowing the radioactive elements in the radioactive waste liquid to pass through the anode membrane 905 or the cathode membrane 907 and enter the concentration area 913 in the decay tank 3; the dilution area 910 of the electrically driven filter device 9 transports the liquid in the dilution area 910 to the drain pipe 7 through the delivery pipe 911, and the liquid is discharged from the drain pipe 7.

[0121] In a preferred embodiment, the delivery pipe 911 is also connected to the inlet of the pump 5;

[0122] The conductivity sensor and / or radiation sensor 8 performs conductivity and / or radioactivity detection on the liquid in the discharge pipe 7. If the standards are met, the liquid is discharged directly; if the standards are not met, the pump 5 is started to transport the liquid in the delivery pipe 911 through the circulation pipe to the upstream of the electric drive filter device 9 for reprocessing, or the discharge valve on the delivery pipe 911 is closed.

[0123] Example 12:

[0124] In a preferred embodiment, before draining the liquid, the pump 5 is started to circulate the liquid in the decay tank 3 through the circulation pipe 51 for a period of time to homogenize the radioactive waste liquid to be discharged, thereby facilitating the radiation sensor 8 or conductivity sensor on the drain pipe 7 to detect the decay of the radioactive waste liquid.

[0125] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The embodiments and features in the embodiments of this application may be arbitrarily combined with each other unless they conflict. The scope of protection of the present invention shall be the technical solutions described in the claims, including equivalent alternatives to the technical features of the technical solutions described in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. An automatic radioactive waste liquid treatment device, characterized by: The decay tank (3) comprises a plurality of decay tanks (3), both ends of the decay tank (3) being connected to a liquid inlet pipe (1) and a liquid outlet pipe (7), respectively, and a liquid level sensor (10) being provided in the decay tank (3); A liquid inlet valve (2) is provided on the liquid inlet pipe (1), and a liquid discharge valve (6) is provided on the liquid discharge pipe (7); A main control device (12) is also provided, a timing module (13) is electrically connected to an input end of the main control device (12), a liquid level sensor (10) is electrically connected to an input end of the main control device (12), and an output end of the main control device (12) is electrically connected to a liquid inlet valve (2) and a liquid discharge valve (6); The main control device (12) is used to control the opening of the liquid inlet valve (2) so that the radioactive waste liquid enters the decay tank (3); the liquid level sensor (10) is used to detect the liquid level in the decay tank (3); and after the decay tank (3) is full, the feedback signal causes the main control device (12) to control the liquid inlet valve (2) to close; the timing module (13) is used to count time, and after the storage time of the radioactive waste liquid in the decay tank (3) reaches a preset half-life time, the feedback signal causes the main control device (12) to control the opening of the liquid discharge valve (6) to discharge the radioactive waste liquid; An electric filter device (9) is also provided near the top of the decay tank (3). A lead (901) of the electric filter device (9) is led out of the decay tank (3) so that the electric filter device (9) filters the radioactive substances in the radioactive waste liquid, and the radioactive waste liquid in the decay tank (3) is discharged to the drain pipe (7) through the delivery pipe (911). The structure of the electric-driven filtering device (9) is as follows: an anode electrode (903), an anode membrane (905), a cathode membrane (907) and a cathode electrode (908) are sequentially provided in the decay tank (3) along the flow direction of the radioactive waste liquid; a working screen (904) is also provided; the working screen (904) is provided between the anode membrane (905) and the cathode membrane (907); the working screen (904) has a plurality of mesh holes for allowing liquid to pass through and generating resistance to the flow of the liquid; a terminal screen (909) is further provided after the cathode electrode (908); the mesh holes of the terminal screen (909) are smaller than the mesh holes of the working screen (904) to generate greater resistance to the flow of the liquid; a dilution zone (910) is formed before the terminal screen (909), and a concentration zone (913) is formed after the terminal screen (909); The membrane cavity between the anode membrane (905) and the cathode membrane (907) is connected to the concentration zone (913) through the concentration tube (906); The dilution zone (910) is connected to the drain pipe (7) via a delivery pipe (911), and a drain valve is provided on the delivery pipe (911).

2. The automatic radioactive liquid waste treatment device according to claim 1 is characterized in that: The decay tanks (3) are divided into multiple groups, and each group of decay tanks (3) corresponds to a liquid inlet pipe (1), so that the decay tanks (3) can treat multiple types of radioactive waste liquids in parallel.

3. The automatic radioactive liquid waste treatment device according to claim 1 is characterized in that: The decay tank (3) has the following structure: the decay tank (3) is a cylindrical barrel structure, end covers are provided at both ends of the decay tank (3), the decay tank (3) is provided with an outer tank body (34), a tank body radiation isolation layer (35) and an inner tank body (36) from the outside to the inside, and the end covers are provided with an outer end cover (31), an end cover radiation isolation layer (32) and an inner end cover (33) from the outside to the inside; The outer tank body (34), the inner tank body (36), the outer end cover (31) and the inner end cover (33) are made of stainless steel, and the tank body radiation isolation layer (35) and the end cover radiation isolation layer (32) are made of boron-containing polyethylene; The decay tank (3) is arranged vertically.

4. The automatic radioactive liquid waste treatment device according to claim 3 is characterized by: The structure of the end cover is as follows: the length of the inner tank body (36) is shorter than the length of the tank body radiation isolation layer (35), the inner tank body (36) forms a step structure, the outer diameter of the inner end cover (33) is the same as the outer diameter of the inner tank body (36), and the inner end cover (33) contacts the end surface of the inner tank body (36); The outer diameter of the end cover radiation isolation layer (32) is the same as the outer diameter of the inner tank body (36), and the end cover radiation isolation layer (32) contacts the tank body radiation isolation layer (35) to form a seal; The outer end cover (31) is provided with a circular step, the step of the outer end cover (31) is located on the inner circle of the tank body radiation isolation layer (35), and the edge of the outer end cover (31) covers the end surface of the outer tank body (34) and is fixedly connected to the end surface of the outer tank body (34).

5. The automatic radioactive liquid waste treatment device according to claim 4 is characterized in that: The structure of the end cover is as follows: a liquid level sensor (10) is arranged on the end cover at the top end of the decay tank (3), and a pressure exhaust valve (11) is also provided on the end cover.

6. The automatic radioactive liquid waste treatment device according to claim 1 is characterized by: The top end cover of the decay tank (3) is connected to the liquid inlet pipe (1), and the bottom end cover of the decay tank (3) is connected to the liquid discharge pipe (7); A radiation sensor (8) is provided on the liquid discharge pipe (7), and the radiation sensor (8) is electrically connected to an input end of the main control device (12).

7. The automatic radioactive liquid waste treatment device according to claim 1 is characterized by: The top end cover of the decay tank (3) is connected to the liquid inlet pipe (1), and the bottom end cover of the decay tank (3) is connected to the liquid discharge pipe (7); A conductivity sensor is provided on the liquid discharge pipe (7), and the conductivity sensor is electrically connected to an input end of the main control device (12).

8. The automatic radioactive liquid waste treatment device according to claim 6 or 7 is characterized in that: A pump (5) is provided on a discharge pipe (7) connected to each decay tank (3); an outlet of the pump (5) is connected to an inlet of a circulation pipe (51); the circulation pipe (51) is buried in the decay tank (3); and an outlet of the circulation pipe (51) is communicated with an inner cavity of the decay tank (3); and the pump (5) is electrically connected to an output end of a main control device (12).

9. The automatic radioactive waste treatment device according to claim 1 is characterized in that: A heating device is also provided in the decay tank (3), and the heating device is electrically connected to the output end of the main control device (12); The decay tank (3) is also provided with a negative pressure pipe for evacuating the decay tank (3); The main control device (12) controls the heating device to heat the liquid in the decay tank (3) and to evacuate the liquid to concentrate the radioactive waste liquid in the decay tank (3).

10. The automatic radioactive liquid waste treatment device according to claim 1, characterized in that: A filter layer (902) is further provided upstream of the anode electrode (903); A working separator (904) is provided between the anode electrode (903) and the anode membrane (905); A working partition (904) is provided between the cathode membrane (907) and the cathode electrode (908); A skeleton ring (912) is provided in the membrane cavity of the cathode membrane (907) and the anode membrane (905), and a delivery pipe (911) is connected to the skeleton ring (912); The edges of the working partition (904) and the terminal partition (909) form a seal with the inner wall of the inner tank (36); The outer wall of the decay tank (3) is divided into two sections along the axial direction, and the two sections are fixedly connected by a flange ring (37).

11. A control method for the automatic treatment device for radioactive liquid waste according to any one of claims 1 to 10, characterized in that The following steps are involved: S1. The main control device or manual control liquid inlet valve (2) is opened, and the radioactive waste liquid enters the decay tank (3); S2, after the liquid level sensor (10) detects that the liquid in the decay tank (3) reaches a preset height, the liquid inlet valve (2) is closed; S3, the timing module (13) starts timing, and when the storage time meets the preset half-life time, the drain valve (6) is opened to drain the liquid.

12. A control method for the automatic treatment device for radioactive liquid waste according to any one of claims 1 to 10, characterized in that The following steps are involved: S01. The type of radioactive waste liquid is set in the main control device, and the liquid inlet valve (2) of the decay tank (3) corresponding to the type of radioactive waste liquid is opened, and the radioactive waste liquid enters the corresponding decay tank (3); S02, after the liquid level sensor (10) detects that the liquid in the decay tank (3) reaches a preset height, the liquid inlet valve (2) is closed; S03, the timing module (13) starts timing, and when the storage time meets the preset half-life time of the current type of radioactive waste liquid, the drain valve (6) is opened to drain the liquid.

13. The control method of the automatic treatment device for radioactive liquid waste according to claim 12 is characterized in that: During storage, a heating device provided in the decay tank (3) is started; water vapor generated by the heating is discharged from the pressure exhaust valve (11) or is discharged along with vacuum pumping of the negative pressure pipe, so as to concentrate the radioactive waste liquid.

14. The control method of the automatic treatment device for radioactive liquid waste according to claim 12, characterized in that: An electric-driven filtering device (9) is provided in the decay tank (3). During storage, the main control device supplies power to the wire (901), so that the radioactive elements in the radioactive waste liquid pass through the anode membrane (905) or the cathode membrane (907) and enter the concentration area (913) in the decay tank (3); the dilution area (910) of the electric-driven filtering device (9) transports the liquid in the dilution area (910) to the drain pipe (7) through the transport pipe (911), and the liquid is discharged from the drain pipe (7).

15. The control method of the automatic radioactive liquid waste treatment device according to claim 14, characterized in that: The delivery pipe (911) is also connected to the inlet of the pump (5); Conductivity and / or radioactivity tests are performed on the liquid in the discharge pipe (7). If the liquid meets the standards, it is directly discharged. If the liquid does not meet the standards, the pump (5) is started to transport the liquid in the delivery pipe (911) to the upstream of the electric drive filter device (9) through the circulation pipe, or the discharge valve on the delivery pipe (911) is closed.

16. The control method for the automatic treatment device for radioactive liquid waste according to claim 12, characterized in that: Before discharge, the pump (5) is started to circulate the liquid through the circulation pipe (51) in the decay tank (3) for a period of time, so that the radioactive waste liquid to be discharged is homogenized, making it easier for the radiation sensor (8) or conductivity sensor on the discharge pipe (7) to detect the decay of the radioactive waste liquid.

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