Automatic radioactive waste liquid treatment device and construction method

Abstract

The invention provides a radioactive waste liquid automatic treatment device and method, the radioactive waste liquid automatic treatment device comprises a plurality of decay tanks, two ends of each decay tank are respectively connected with a liquid inlet pipe and a liquid discharge pipe, and each decay tank is provided with a liquid level sensor; a liquid inlet valve is arranged on the liquid inlet pipe, and a liquid discharge valve is arranged on the liquid discharge pipe; a main control device is further arranged, the timing module is electrically connected with the main control device, the liquid level sensor is 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 valve and the liquid outlet valve. The main control device is used for controlling the opening of the liquid inlet valve to enable the radioactive waste liquid to enter the decay tank, the liquid level sensor is used for detecting the liquid level in the decay tank and feeding back a signal to enable the main control device to control the closing of the liquid inlet valve after the decay tank is full, and the timing module is used for timing. And after the storage time of the radioactive waste liquid in the decay tank reaches a preset half-life period, a signal is fed back to enable the main control device to control the drain valve to be opened to discharge the radioactive waste liquid. The device can be arranged in a building, the occupied space is small, and the size is reduced.

Description

Technical Field

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

[0002] At present, the application of radioactive elements in military, energy, industry, agriculture, medicine and other scientific research has been very extensive. However, the amount of radioactive waste gas, waste liquid and solid waste generated in the entire development and utilization process is also increasing. Among the radioactive "three wastes", radioactive wastewater needs to be treated. In the medical field, radioactive wastewater refers to the wastewater discharged by hospitals after the application of nuclear elements for diagnosis or treatment. According to the concentration of radioactive wastewater contained in the wastewater, it is divided into high-level, medium-level and low-level radioactive wastewater. According to the type of radiation contained in the wastewater, it can also be divided into three types of radioactive wastewater: α, β and γ. Radioactive wastewater has the characteristics of many types and high concentrations of heavy metal elements, is radioactive, and is harmful to humans and animals. Therefore, radioactive wastewater must be properly treated to reduce the radioactivity of the wastewater to below the safety value specified by the state before it can be discharged into water bodies or urban sewers. According to the "Nuclear Medicine Radiation Protection and Safety Requirements" issued by the Ministry of Ecology and Environment in 2021, nuclear medicine workplaces should be equipped with trough-type or plug-flow radioactive waste liquid decay pools or special containers to collect radioactive waste liquid generated in the site and radioactive waste liquid generated by cleaning during emergency accidents. Radioactive liquid waste collected in decay pools or special containers should be stored until the discharge requirements are met.

[0003] At present, the most common way to store waste liquid is the radioactive decay pool, which can be divided into two types: trough type and plug flow type. Trough type decay pool: adopts multi-format intermittent discharge, generally four grids can be used, arranged in parallel, and the design volume of each grid is 50% of the total discharge volume of radioactive wastewater with 10 half-lives of the longest half-life isotope, that is, the amount of radioactive wastewater with 5 half-lives stored. A solenoid valve is installed on the water inlet pipe, and the effluent is discharged by submersible pump pressure. Each grid is designed with a liquid level line, and four grids are used in turn. When the waste liquid in the grid exceeds 10 half-lives, the corresponding submersible pump is started to discharge after the monitoring meets the standard. The advantages of the decay pool are strong impact resistance and stable and reliable effluent water quality. The disadvantages are that the decay pool has a large volume, occupies a large area, has a high cost, requires control valves and water pumps, and the control is relatively complex. Plug flow decay pool: The water inlet and outlet of this pool are continuous, and a diversion wall is installed in the pool, and plug flow discharge is carried out. The total design volume of the decay pool is the total discharge volume of radioactive wastewater of 10 half-lives of the longest half-life isotope. Each one adopts a diversion pipe, and the wastewater enters from the bottom of the pool and is discharged from the top to prevent short circuit and ensure the decay effect. The plug-flow decay pool has the advantages of small pool volume, small footprint, low cost, simple operation, no or little maintenance, etc. Its disadvantage is poor impact resistance. If a large amount of radioactive wastewater is discharged in a concentrated manner, when the radioactive substances in the wastewater increase, the wastewater has to be discharged before it decays to the allowable discharge concentration in the decay pool, which will cause radioactive pollution accidents. The above methods all require excavation of buildings to form ponds, which are not suitable for laboratories located in buildings. Taking phosphorus-32 as an example, the half-life of phosphorus-32 is about 14.3 days, so 10 half-lives require 143 days. In situations where the amount of nuclear medicine elements is large, the treatment of medical nuclear wastewater requires a large storage space, making the storage cost very high. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an automatic treatment device for radioactive waste liquid and a construction method, which can realize the attenuation storage demand of radioactive waste liquid in high-rise buildings, so that the radioactive waste liquid can be discharged after storage and attenuation, so as to avoid radiation pollution to the environment. Preferably, the demand for storage space of radioactive waste liquid can be reduced, and the demand for large amount of nuclear medicine elements can be met.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: an automatic treatment device for radioactive waste liquid, comprising a plurality of decay tanks, both ends of which are respectively connected to a liquid inlet pipe and a liquid outlet pipe, and a liquid level sensor is provided in the decay tank; A liquid inlet valve is provided on the liquid inlet pipe, and a liquid discharge valve is provided on the liquid discharge pipe; 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; 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, and 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 for timing, and after the storage time of the radioactive waste liquid in the decay tank reaches a preset half-life duration, the feedback signal causes the main control device to control the opening of the liquid discharge valve to discharge the radioactive waste liquid.

[0006] 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.

[0007] In a preferred solution, the structure of the decay tank is as follows: the decay tank is a cylindrical barrel structure, end covers are provided at both ends of the decay tank, the decay tank is provided with 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 are provided with an outer end cover, an end cover radiation isolation layer and an inner end cover from the outside to the inside; 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; The decay tanks are arranged vertically.

[0008] In a preferred solution, the structure of the end cover 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 step structure, the outer diameter of the inner end cover is the same as the outer diameter of the inner tank body, and the inner end cover contacts the end surface of the inner tank body; The outer diameter of the radiation isolation layer of the end cover is the same as the outer diameter of the inner tank body, and the radiation isolation layer of the end cover contacts the radiation isolation layer of the tank body and forms a seal; The outer end cover is provided with a circular step, the step of the outer end cover is located at 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.

[0009] 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 of the decay tank, and a pressure exhaust valve is also arranged on the end cover.

[0010] In a preferred solution, the top end cover of the decay tank is connected to the liquid inlet pipe, and the bottom end cover of the decay tank is connected to the liquid discharge pipe; A radiation sensor is arranged on the liquid discharge pipe and is electrically connected to an input end of the main control device.

[0011] In a preferred solution, the top end cover of the decay tank is connected to the liquid inlet pipe, and the bottom end cover of the decay tank is connected to the liquid discharge pipe; A conductivity sensor is arranged on the liquid discharge pipe, and the conductivity sensor is electrically connected to the input end of the main control device.

[0012] In a preferred solution, a pump is provided on the discharge 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.

[0013] In a preferred solution, a heating device is also provided in the decay tank, and the heating device is electrically connected to the output end of the main control device; The decay tank is also provided with a negative pressure pipe for evacuating the decay tank; The main control device controls the heating device to heat the liquid in the decay tank and evacuate the liquid to concentrate the radioactive waste liquid in the decay tank.

[0014] In a preferred solution, a heating device is also provided in the decay tank, and the heating device is electrically connected to the output end of the main control device; The decay tank is also provided with a negative pressure pipe for evacuating the decay tank; 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.

[0015] In a preferred embodiment, an electrically driven filter device is provided near the top of the decay tank, and the wires of the electrically driven filter device are led out of the decay tank so that the electrically driven filter device can filter the radioactive substances in the radioactive waste liquid, so that the radioactive waste liquid in the decay tank can be discharged to the drain pipe after filtering through the delivery pipe.

[0016] 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, and a working screen, and is also provided with at least one of an anode membrane or a cathode membrane; The working spacer is arranged between the anode membrane or cathode membrane and the cathode electrode, or the working spacer is arranged between the anode membrane and the cathode membrane.

[0017] In a preferred solution, the structure of the electric-driven filtering 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, and a working partition is also provided. The working partition is arranged between the anode membrane and the cathode membrane. The working partition has a plurality of mesh holes for allowing liquid to pass through and generating resistance to the flow of the liquid. A terminal partition is also provided after the cathode electrode. The mesh holes of the terminal partition are smaller than the mesh holes of the working partition to generate greater resistance to the flow of the liquid. A dilution zone is formed before the terminal partition, and a concentration zone is formed after the terminal partition. The membrane cavity between the anode membrane and the cathode membrane is connected to the concentration zone through a concentration tube; The dilution zone is connected with the discharge pipe through a delivery pipe, and a discharge valve is provided on the delivery pipe.

[0018] In a preferred embodiment, a filter layer is also provided upstream of the anode electrode; A working separator is provided between the anode electrode and the anode membrane; A working partition is provided between the cathode membrane and the cathode electrode; 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; The edges of the working partition and the terminal partition form a seal with the inner wall of the inner tank; 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.

[0019] A control method using the above-mentioned automatic radioactive waste liquid treatment device comprises the following steps: S1. The main control device or manual control liquid inlet valve is opened, and the radioactive waste liquid enters the decay tank; S2, after the liquid level sensor detects that the liquid in the decay tank reaches the preset height, the liquid inlet valve is closed; S3. The timing module starts timing, and when the storage time meets the preset half-life time, the drain valve is opened to drain the liquid.

[0020] A control method using the above-mentioned automatic radioactive waste liquid treatment device comprises the following steps: 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; S02, after the liquid level sensor detects that the liquid in the decay tank reaches a preset height, the liquid inlet valve is closed; S03. The timing module starts timing, and 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.

[0021] In a preferred solution, during the storage process, a heating device disposed in the decay tank is started; water vapor generated by the heating is discharged from a pressure exhaust valve or is discharged along with vacuum extraction of a negative pressure pipe, so as to concentrate the radioactive waste liquid.

[0022] In a preferred embodiment, an electrically driven filtering device is provided in the decay tank. During the storage process, the main control device supplies power to the wires, so that the radioactive elements in the radioactive waste liquid pass through the anode membrane or the cathode membrane and enter the concentration area in the decay tank; the dilution area of ​​the electrically driven filtering device transports the dilution area liquid to the drain pipe through the delivery pipe, and the liquid is discharged from the drain pipe.

[0023] In a preferred embodiment, the delivery pipe is also connected to the inlet of the pump; Conduct conductivity and / or radioactivity tests on the liquid in the discharge pipe. If it meets the standards, discharge it directly. If it does not meet the standards, start the pump to transport the liquid in the delivery pipe to the upstream of the electric-driven filtration device through the circulation pipe, or close the discharge valve on the delivery pipe.

[0024] In a preferred embodiment, before discharging the liquid, the pump is started to circulate the liquid in the decay tank through the circulation pipe for a period of time to homogenize the radioactive waste liquid to be discharged, so that the radiation sensor or conductivity sensor on the discharge pipe can detect the decay of the radioactive waste liquid.

[0025] The present invention provides an automatic radioactive waste liquid treatment device and method, which achieves the following beneficial effects by adopting the above structure and method: 1. The present invention can ensure that the discharged waste liquid no longer has radioactive pollution, and occupies a small space and saves volume. The present invention can be set up in a building to meet the needs of a high-level laboratory.

[0026] 2. The present invention adopts a concentration function, which can greatly concentrate the radioactive waste liquid before storage, further improve the utilization rate of the storage space, and improve the impact resistance.

[0027] 3. The present invention adopts an electric drive filtering solution, which can further improve the utilization rate of storage space.

[0028] 4. The present invention is provided with a detection function, which can prevent the discharge of radioactive waste liquid that does not meet the requirements. In order to ensure the accuracy of the detection, the present invention adopts a circulating homogenization scheme to ensure the treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is the overall structural front view of the present invention.

[0030] Figure 2 It is a schematic cross-sectional view of the local structure of the decay tank of the present invention.

[0031] Figure 3 It is a schematic cross-sectional view of the end cover structure of the decay tank of the present invention.

[0032] Figure 4 It is a partial cross-sectional view of the upper structure and the electric-driven filtering device of the present invention.

[0033] Figure 5 It is a schematic structural diagram of the electric drive filtering device of the present invention.

[0034] Figure 6 It is a schematic diagram of the arrangement structure of the anode membrane or cathode membrane of the present invention.

[0035] Figure 7 It is a control structure block diagram of the present invention.

[0036] 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 partition 904, anode membrane 905, concentration pipe 906, cathode membrane 907, cathode electrode 908, terminal partition 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

[0037] Embodiment 1: like Figure 1 As shown in the figure, an automatic treatment device for radioactive waste liquid includes a plurality of decay tanks 3, both ends of which are connected to a liquid inlet pipe 1 and a liquid outlet pipe 7, respectively, and a liquid level sensor 10 is 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; 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.

[0038] 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. After the decay tank 3 is full, the feedback signal causes the main control device 12 to control the closing of the liquid inlet valve 2. The timing module 13 is used to time, and after the storage time of the radioactive waste liquid in the decay tank 3 reaches the preset half-life duration, 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. With this structure, the automatic control of waste liquid discharge is realized, and the probability of manual operation errors is reduced.

[0039] Embodiment 2: The preferred solution is Figure 1 As shown in , 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.

[0040] The preferred solution is Figure 2As shown in the figure, the structure of the decay tank 3 is as follows: 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 306 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. Preferably, the decay tank 3 adopts a cylindrical structure, and its length is 2 to 10 times of its diameter. With this structure, the indoor space height can be fully utilized to store more radioactive waste liquid in a small space.

[0041] The preferred solution is Figure 2 , 3 As shown in , 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 and forms a seal; The outer end cover 31 is provided with a circular step, the step of the outer end cover 31 is located at 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. With the above structure, the strength of the entire tank body can be ensured while ensuring the anti-radiation effect.

[0042] The preferred solution is Figure 3 As shown in the figure, the structure of the end cover is as follows: a liquid level sensor 10 is arranged on the end cover at the top of the decay tank 3, and a pressure exhaust valve 11 is also arranged on the end cover. The liquid level sensor 10 is used to detect the liquid level of the radioactive waste liquid in the decay tank 3. The pressure exhaust valve 11 is used to discharge the pressurized gas to avoid high pressure in the decay tank 3 due to temperature changes.

[0043] Embodiment 3: 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; A radiation sensor 8 is provided on the liquid discharge pipe 7, and the radiation sensor 8 is electrically connected to the input end of the main control device 12. This structure can prevent the discharge of radioactive waste liquid that does not meet the treatment requirements. The radiation sensor 8 adopts a Geiger-Mueller counter, a scintillation detector or a semiconductor detector.

[0044] Embodiment 4: In a 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; A conductivity sensor is provided on the drain pipe 7, and the conductivity sensor is electrically connected to the input end of the main control device 12. The conductivity sensor is arranged at the position of the radiation sensor 8. The conductivity sensor is used to monitor the conductivity change of the inlet and outlet water in real time to evaluate the treatment effect.

[0045] Embodiment 5: The preferred solution is Figure 1 , 2 As shown in the figure, a pump 5 is provided on the drainage pipe 7 connected to each decay tank 3, the outlet of the pump 5 is connected to the inlet of the circulation pipe 51, the circulation pipe 51 is buried in the decay tank 3, and the outlet of the circulation pipe 51 is connected to the inner cavity of the decay tank 3; the pump 5 is electrically connected to the output end of the main control device 12. With this structure, the radioactive waste liquid can be homogenized to avoid errors in the detection data. In addition, the pump 5 can also recirculate the radioactive waste liquid that fails the detection to the decay tank 3 for further treatment.

[0046] Embodiment 6: 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.

[0047] A negative pressure pipe is also provided near the top of the decay tank 3 to evacuate the decay tank 3; 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 evacuation combined with heating can greatly improve the concentration efficiency.

[0048] Embodiment 7: The preferred solution is Figures 4 to 6 As shown in the figure, an electric-driven filter device 9 is also provided near the top of the decay tank 3, and a wire 901 of the electric-driven filter device 9 is led out of the decay tank 3, so that the electric-driven filter device 9 filters the radioactive substances in the radioactive waste liquid, and concentrates the radioactive waste liquid in the decay tank 3, and the filtered liquid is discharged to the drain pipe 7 through the delivery pipe 911. With this structure, the concentration efficiency is further improved.

[0049] The preferred solution is Figures 5 and 6 As shown in , 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 also provided with at least one of an anode membrane 905 and a cathode membrane 907; The working partition 904 is arranged between the anode membrane 905 or the cathode membrane 907 and the cathode electrode 908 , or the working partition 904 is arranged between the anode membrane 905 and the cathode membrane 907 .

[0050] In a preferred embodiment, 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 arranged in the decay tank 3 along the flow direction of the radioactive waste liquid, and a working partition 904 is also provided. The working partition 904 is arranged between the anode membrane 905 and the cathode membrane 907. The working partition 904 has a plurality of mesh holes for allowing liquid to pass through and generating resistance to the flow of the liquid. A terminal partition 909 is further provided after the cathode electrode 908. The mesh holes of the terminal partition 909 are smaller than the mesh holes of the working partition 904 to generate greater resistance to the flow of the liquid. A dilution zone 910 is formed before the terminal partition 909, and a concentration zone 913 is formed after the terminal partition 909. The membrane cavity between the anode membrane 905 and the cathode membrane 907 is connected to the concentration area 913 through the concentration tube 906; The dilution zone 910 is connected to the drain pipe 7 through the delivery pipe 911, and a drain valve is provided on the delivery pipe 911. The treated liquid in the dilution zone 910 meets the discharge standard and is discharged after being tested.

[0051] The preferred solution is Figure 5 As shown in , a filter layer 902 is also provided upstream of the anode electrode 903; A working screen 904 is provided between the anode electrode 903 and the anode membrane 905; A working screen 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; In the electric drive filtration device 9, it is very important to select a suitable membrane material. The anode membrane 905 preferably uses a polymer modified with a sulfonic acid group, such as sulfonated polyphenylene ether (SPE), sulfonated polysulfone (SPSU), etc. The cathode membrane 907 preferably uses a polymer modified with a quaternary ammonium salt group, such as quaternized polyacrylonitrile (QPA), etc.

[0052] 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.

[0053] Embodiment 8: A control method using the above-mentioned automatic radioactive waste liquid treatment device comprises the following steps: 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.

[0054] Embodiment 9: A control method using the above-mentioned automatic radioactive waste liquid treatment device comprises the following steps: 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.

[0055] Embodiment 10: In a preferred solution, during storage, the heating device provided in the decay tank 3 is started; the water vapor generated by heating is discharged from the pressure exhaust valve 11 or discharged along with the vacuum of the negative pressure pipe to concentrate the radioactive waste liquid. The concentrated radioactive waste liquid can significantly reduce the storage space. This solution is particularly suitable for application scenarios with small space. Preferably, the heating temperature is below the boiling point to avoid the discharge of splashing.

[0056] Embodiment 11: In the preferred embodiment, an electrically driven filter device 9 is provided in the decay tank 3. During the storage process, 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 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.

[0057] In a preferred embodiment, the delivery pipe 911 is also connected to the inlet of the pump 5; The conductivity sensor and / or radiation sensor 8 performs conductivity and / or radioactivity detection on the liquid in the discharge pipe 7. If it meets the standard, it is directly discharged; if it does not meet the standard, 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.

[0058] Embodiment 12: In a preferred embodiment, before discharging 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, so that the radioactive waste liquid to be discharged is homogenized, so that the radiation sensor 8 or the conductivity sensor on the discharge pipe 7 can detect the decay of the radioactive waste liquid.

[0059] The above-mentioned embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An automatic treatment device for radioactive liquid waste, characterized in that: It comprises a plurality of decay tanks (3), the two ends of the decay tanks (3) are respectively connected to a liquid inlet pipe (1) and a liquid outlet pipe (7), and a liquid level sensor (10) is 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, the timing module (13) is electrically connected to the input end of 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); 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, a feedback signal causes the main control device (12) to control the closing of the liquid inlet valve (2); 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, a feedback signal causes the main control device (12) to control the opening of the liquid discharge valve (6) to discharge the radioactive waste liquid.

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

3. The automatic radioactive 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 waste liquid treatment device according to claim 3 is characterized in that: 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) is in contact with 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) is in contact with 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 at 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 waste liquid treatment device according to claim 4 is characterized in that: The structure of the end cover is as follows: the 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 arranged on the end cover.

6. The automatic radioactive waste liquid treatment device according to claim 1 is characterized in that: 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 a main control device (12).

7. The automatic radioactive waste liquid treatment device according to claim 1 is characterized in that: 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 treatment device for radioactive liquid waste 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 so as to concentrate the radioactive waste liquid in the decay tank (3).

10. The automatic radioactive waste treatment device according to claim 8 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 so as to concentrate the radioactive waste liquid in the decay tank (3).

11. The automatic radioactive liquid waste treatment device according to any one of claims 1 to 7, 9 to 10, characterized in that: An electrically driven filter device (9) is also provided near the top of the decay tank (3). A lead (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 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) after being filtered through the delivery pipe (911).

12. The automatic radioactive waste liquid treatment device according to claim 11 is characterized in that: The structure of the electric-driven filtering device (9) is as follows: an anode electrode (903), a cathode electrode (908), and a working screen (904) are provided in the electric-driven filtering device (9), and at least one of an anode membrane (905) and a cathode membrane (907) is also provided; The working partition (904) is arranged between the anode membrane (905) or the cathode membrane (907) and the cathode electrode (908), or the working partition (904) is arranged between the anode membrane (905) and the cathode membrane (907).

13. The automatic radioactive waste liquid treatment device according to claim 11 is characterized in that: 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 arranged in the decay tank (3) along the flow direction of the radioactive waste liquid; a working partition net (904) is also arranged; the working partition net (904) is arranged between the anode membrane (905) and the cathode membrane (907); the working partition net (904) has a plurality of mesh holes for allowing liquid to pass through and generating resistance to the flow of the liquid; a terminal partition net (909) is also arranged behind the cathode electrode (908); the mesh holes of the terminal partition net (909) are smaller than the mesh holes of the working partition net (904) to generate greater resistance to the flow of the liquid; a dilution zone (910) is formed before the terminal partition net (909); and a concentration zone (913) is formed after the terminal partition net (909); The membrane cavity between the anode membrane (905) and the cathode membrane (907) is connected to the concentration area (913) through the concentration tube (906); The dilution zone (910) is connected to the liquid discharge pipe (7) via a delivery pipe (911), and a liquid discharge valve is provided on the delivery pipe (911).

14. The automatic radioactive waste liquid treatment device according to claim 13 is characterized in that: A filter layer (902) is also provided upstream of the anode electrode (903); A working partition (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 the 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 body (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 via a flange ring (37).

15. A control method using the automatic radioactive waste liquid treatment device according to any one of claims 1 to 14, characterized in that The following steps are involved: S1. The main control device or the 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.

16. A control method using the automatic treatment device for radioactive liquid waste according to any one of claims 1 to 14, 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.

17. The control method of the automatic treatment device for radioactive liquid waste according to any one of claims 15 or 16, characterized in that: During storage, a heating device disposed 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 extraction of the negative pressure pipe, so as to concentrate the radioactive waste liquid.

18. The control method of the automatic treatment device for radioactive liquid waste according to any one of claims 15 or 16, characterized in that: An electrically 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 electrically 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).

19. The control method of the automatic radioactive waste liquid treatment device according to claim 18, 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, the liquid 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-driven filtering device (9) through the circulation pipe, or the discharge valve on the delivery pipe (911) is closed.

20. The control method of the automatic treatment device for radioactive liquid waste according to any one of claims 15 or 16, characterized in that: Before the liquid is discharged, the pump (5) is started to circulate the liquid in the decay tank (3) through the circulation pipe (51) for a period of time, so that the radioactive waste liquid to be discharged is homogenized, which facilitates 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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