Test method and system for regenerating nuclide-accumulating electro-deionization membrane stack
By performing nuclide measurement and reagent monitoring on the electrostatic desalination membrane stack, regenerating it and using ultrapure water for regeneration, and combining it with non-radioactive isotope simulation, the problem of cleaning and decontamination caused by nuclide accumulation was solved, achieving efficient nuclide removal and data support, and optimizing the regeneration process.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE CO LTD
- Filing Date
- 2025-12-03
- Publication Date
- 2026-06-11
AI Technical Summary
In existing technologies, when using electrostatic desalination membrane reactors to treat radioactive waste liquids in nuclear power plants, radioactive nuclides tend to accumulate, leading to difficulties in cleaning and decontamination and high subsequent disposal costs.
By measuring radionuclides in the EDI membrane stack to be treated, introducing regeneration agents and monitoring the radionuclide content in real time until the standard is reached, and then introducing ultrapure water for fine regeneration, combined with experiments to simulate actual working conditions using non-radioactive isotopes, the membrane stack is ensured to reach a clean de-control level.
It reduced the difficulty of subsequent disposal, provided a reliable basis for experimental data, optimized the regeneration process, and extended the service life of the membrane stack.
Smart Images
Figure CN2025139605_11062026_PF_FP_ABST
Abstract
Description
Test method and system for regenerating and accumulating nuclides electrostatic desalination membrane reactor Technical Field
[0001] This invention relates to the field of radioactive waste treatment technology in nuclear power plants, and specifically to a test method for a regenerating and accumulating nuclide electrostatic desalination membrane reactor. Background Technology
[0002] Electrostatic precipitator (EDI) membrane stacks are used in nuclear power plants to treat radioactive waste liquids. Compared with traditional nuclear power ion exchange processes, EDI has several significant advantages, including but not limited to its higher treatment efficiency, sustainable resin regeneration, and simpler operation and maintenance. Furthermore, EDI requires less floor space and generates relatively less secondary waste liquid.
[0003] However, in actual nuclear power plant applications, EDI (Electrodeionization) treatment of radioactive waste can lead to the accumulation of radionuclides within the membrane reactor. Although the EDI can continuously regenerate itself by electrolyzing water to generate H+ and OH- during waste treatment, after long-term continuous operation, a dynamic equilibrium will be reached within the membrane reactor. Some radionuclides cannot be completely removed and gradually accumulate within the reactor. This accumulation not only directly determines the actual lifespan of the EDI device but also increases the difficulty of subsequent disposal. Because the radionuclides are mainly concentrated in the resin packing inside the membrane reactor, it is difficult to clean and decontaminate them through disassembly. The operation is complex and the decontamination efficiency is low, ultimately leading to increased costs and cumbersome procedures for the subsequent disposal of contaminated EDI membrane reactors.
[0004] Therefore, an experimental method is needed to regenerate accumulated radionuclide EDI to regenerate the radionuclide-contaminated EDI membrane stack, thereby achieving a clean and uncontrolled level of radioactivity in the device and reducing the difficulty of subsequent disposal. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology in that the cleaning and decontamination of contaminated EDI membrane stacks is difficult and the subsequent treatment is difficult, and to provide a test method and system for regenerating and accumulating radionuclides electrostatic desalination membrane stacks.
[0006] The present invention solves the above-mentioned technical problems through the following technical solution:
[0007] This invention provides a method for testing a regenerating and accumulating nuclide electrostatic desalination membrane reactor, characterized by comprising:
[0008] Step 1: Perform radionuclide measurements on the EDI membrane stack to be treated;
[0009] Step 2: Continuously introduce regeneration agent into the EDI membrane stack to be treated and monitor the radionuclide content in the EDI membrane stack in real time until the radionuclide content in the EDI membrane stack to be treated meets the requirements. Then record the amount of the regeneration agent introduced and the data on the changes in the concentration of various nuclides.
[0010] Step 3: Pass ultrapure water through the EDI membrane stack that has met the initial regeneration monitoring requirements for regeneration until the data collected by the energy dispersive spectrometer meets the standard, and the regenerated EDI membrane stack is obtained.
[0011] According to an embodiment of the present invention, in step 1,
[0012] After measuring the radionuclides in the EDI membrane stack to be treated, the types of radionuclides contained in the EDI membrane stack to be treated and the activity concentration of each radionuclide are recorded. Then, according to the power plant's operation requirements, the standards for various radionuclides in the regenerated EDI membrane stack are determined.
[0013] According to one embodiment of the present invention, after step 1, the method further includes:
[0014] Using the nuclide types and concentration data obtained in step 1, a solution with the same composition is prepared using non-radioactive isotopes and introduced into a new EDI membrane stack until equilibrium is reached, resulting in at least two experimental EDI membrane stacks; wherein, the nuclide types and their corresponding concentrations in the experimental EDI membrane stacks are consistent with those in the EDI membrane stack to be treated.
[0015] According to one embodiment of the present invention, after obtaining the test EDI membrane stack, the same amount of the regeneration agent used in step 2 is introduced into all the test EDI membrane stacks, and one of the regenerated test EDI membrane stacks is disassembled to confirm whether the element content at each location meets the test standard.
[0016] According to one embodiment of the present invention, after the test membrane stack meets the test standards, the same amount of ultrapure water as that in the EDI membrane stack to be treated is introduced into another of the test EDI membrane stacks, and the regenerated test EDI membrane stack is disassembled to confirm whether the element content at each location meets the test standards.
[0017] According to one embodiment of the present invention, the regeneration agent is a 5% NaCl solution.
[0018] According to one embodiment of the present invention, step 3 includes:
[0019] Step 31: First, introduce ultrapure water into the EDI membrane stack to be treated until the online conductivity meter confirms that the residual regeneration agent in the flow channel has been rinsed clean.
[0020] Step 32: After the residual regeneration agent is rinsed clean, continue to introduce ultrapure water, turn on the DC power supply of the EDI membrane stack to be treated, and use an energy dispersive spectrometer to collect and process data in real time until the energy dispersive spectrometer reading meets the standard.
[0021] The present invention also provides a test system for a regenerative accumulating nuclide electrostatic desalination membrane reactor, employing the test method for a regenerative accumulating nuclide electrostatic desalination membrane reactor as described above, the system comprising:
[0022] A parallel regenerative reagent delivery path and an ultrapure water delivery path are provided, wherein the regenerative reagent delivery path and the ultrapure water delivery path are connected to the test flow path, and the target EDI membrane is stacked on the test flow path; wherein...
[0023] The target EDI membrane stack is either an EDI membrane stack to be processed or a new EDI membrane stack, and an energy dispersive spectrometer is connected to the test flow path.
[0024] According to one embodiment of the present invention, the regenerative agent delivery path is provided with a regenerative agent storage tank, an inlet pump, and a first control valve;
[0025] The ultrapure water delivery path is equipped with an ultrapure water tank, an inlet pump, and a second control valve;
[0026] The first control valve and the second control valve are used to control the connection between the test flow path and the regeneration agent delivery flow path or the ultrapure water delivery flow path.
[0027] According to one embodiment of the present invention, the test flow path is split into a cleaning flow path and a concentration flow path downstream of the target EDI membrane stack;
[0028] The cleaning flow path returns to the inlet of the target EDI membrane stack, and the concentration flow path is connected to the outside of the target EDI membrane stack; wherein...
[0029] Monitoring points are provided at the inlet of the target EDI membrane stack and on the cleaning flow path, and the monitoring points are electrically connected to the energy dispersive spectrometer.
[0030] The positive and progressive effects of this invention are as follows:
[0031] The present invention provides a test method for regenerating accumulated radionuclides in an EDI membrane stack. First, radionuclide measurements are performed on the EDI membrane stack to be treated. Then, regeneration reagents are continuously introduced while the radionuclide content is monitored in real time until it reaches the standard. Finally, ultrapure water is introduced for further regeneration until the energy dispersive spectroscopy (EDS) data meets the standard. This test method allows for real-time and accurate monitoring of the EDI membrane stack's regeneration operation and flexible adjustment of the regeneration reagent content according to the test progress. It also provides abundant test data, offering a reliable data foundation for studying the performance and operation of the EDI membrane stack, and significantly reducing the difficulty of subsequent treatment due to radionuclide accumulation. Attached Figure Description
[0032] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:
[0033] Figure 1 is a flowchart of the experimental method for the regenerated cumulative nuclide electro-desalination membrane stack of the present invention;
[0034] Figure 2 is a flowchart of the experimental EDI membrane stack of the present invention;
[0035] Figure 3 is a schematic diagram of the resin sampling points during the disassembly of the experimental EDI membrane stack.
[0036] Figure 4 is a schematic diagram of the experimental system for the regenerating and accumulating nuclide electro-desalination membrane reactor of the present invention. Detailed Implementation
[0037] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.
[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0039] Referring to Figure 1, this invention proposes a test method for a regenerating and accumulating radionuclide electrostatic desalination membrane reactor, comprising:
[0040] Step 1: Perform radionuclide measurements on the EDI membrane stack to be treated.
[0041] As can be seen, the EDI membrane stack to be treated is the radionuclide-contaminated EDI membrane stack in Figure 1. Before regenerating the EDI membrane stack, radionuclide measurements are first performed on the EDI membrane stack to confirm and record the types of radionuclides contained in the EDI membrane stack that have accumulated radionuclides. For example, an energy dispersive spectroscopy (EDS) instrument is used to scan and measure different areas of the EDI membrane stack, such as the monitoring points at the EDI membrane stack inlet and clean flow, to determine the types of radionuclides. Subsequently, resin or contamination samples are collected from the concentrate chamber and desalination chamber near the anode and cathode of the EDI membrane stack, as well as the inlet, outlet, and intermediate positions in the middle area. The samples are then tested using methods such as EDS measurements to obtain the activity concentration of each radionuclide.
[0042] Subsequently, based on the actual operational needs of the nuclear power plant, the standards for various radionuclides in the regenerated EDI membrane stack were determined.
[0043] Step 2: Continuously introduce regenerative agent into the EDI membrane stack to be treated and monitor the radionuclide content in the EDI membrane stack in real time until the radionuclide content in the EDI membrane stack meets the requirements. Then record the amount of regenerative agent introduced and the data on the changes in the concentration of various nuclides.
[0044] That is, once step 1 is completed, the process of regenerating the EDI membrane stack begins.
[0045] Specifically, referring to Figure 1, this application uses a 5% NaCl solution as a regeneration agent. The 5% NaCl solution is pumped into the EDI membrane stack to be treated. After a certain period of time, the data is collected and processed using an energy dispersive spectrometer (corresponding to the online data acquisition and processing process in Figure 1) to determine whether the content of each radionuclide in the EDI membrane stack meets the preliminary regeneration monitoring requirements. If the requirements are not met, the 5% NaCl solution is continued to be pumped into the EDI membrane stack until the preliminary regeneration monitoring requirements are met. If the requirements are met, the time, volume, and changes in the concentration of various radionuclides are recorded.
[0046] The second step yields an EDI membrane stack that has undergone preliminary regeneration.
[0047] Step 3: Pass ultrapure water through the EDI membrane stack that has met the initial regeneration monitoring requirements for regeneration until the data collected by the energy dispersive spectrometer meets the standard, and the regenerated EDI membrane stack is obtained.
[0048] It can be seen that the EDI membrane stack to be treated that has met the initial regeneration monitoring requirements corresponds to the EDI membrane stack obtained in step 2 after initial regeneration treatment.
[0049] That is, when the EDI membrane stack to be treated meets the initial regeneration monitoring requirements, ultrapure water is continuously pumped into it, and the residual NaCl in the flow channel is checked by an online conductivity meter to confirm whether it has been rinsed clean; wherein, the conductivity reading is <1μs / cm.
[0050] After rinsing, continue to flow ultrapure water and turn on the power to the EDI membrane stack to be treated. First, set the operating current of the EDI membrane stack to be treated to 2.5A. After a certain period of time, use an energy dispersive spectroscopy (EDS) instrument to collect the processed data and determine whether the various data of the EDI membrane stack meet the requirements.
[0051] If the requirements are met, the operating current of the EDI membrane stack is increased to 5.0A, and the operation continues for a certain period of time until the energy dispersive spectrometer reading meets the standard, thus obtaining a regenerated EDI membrane stack; if the requirements are not met, ultrapure water is continuously introduced until the requirements are met.
[0052] The third step yields a finely regenerated EDI, which corresponds to the regenerated electro-desalination membrane stack in Figure 1.
[0053] It should be noted that when conducting experiments on the EDI membrane stack to be treated, a test EDI membrane stack was also set up simultaneously as a comparison test.
[0054] Please refer to Figure 2 for details. Using the nuclide types and concentration data obtained in step 1, prepare a solution with the same composition using non-radioactive isotopes and pass it into a new EDI membrane stack until equilibrium is reached to obtain at least two experimental EDI membrane stacks. The nuclide types and their corresponding concentrations in the experimental EDI membrane stacks are consistent with those in the EDI membrane stack to be treated.
[0055] After obtaining the test EDI membrane stacks, the same amount of regeneration agent as used in step 2 is introduced into all the test EDI membrane stacks. Then, one of the regenerated test EDI membrane stacks is disassembled, and the element content at each location is confirmed to meet the test standards.
[0056] After the test membrane stack meets the test standards, the same amount of ultrapure water as that in the EDI membrane stack to be treated is introduced into the other test EDI membrane stack. The regenerated test EDI membrane stack is then disassembled to confirm whether the element content at each location meets the test standards.
[0057] That is, when the EDI membrane stack to be treated meets the requirements for preliminary regeneration monitoring and after fine regeneration treatment, the two experimental EDI membrane stacks are disassembled respectively. The element content of the resin at each position after disassembly is determined by energy dispersive spectroscopy, and the relevant data, images and records are output.
[0058] Among them, the node that has met the initial regeneration monitoring requirements corresponds to the EDI membrane stack node after initial treatment in Figure 1, while the node that has been regenerated after fine regeneration treatment corresponds to the regenerated electro-desalination membrane stack node obtained after fine regeneration treatment in Figure 1.
[0059] After all simulation steps are completed, the regenerated EDI membrane stack is disassembled to confirm whether the element content at each location meets the test standards. It is then compared and verified with the EDI membrane stack to be treated to confirm whether the relevant indicators are consistent. If they are consistent, it can be determined that the repeated test has successfully simulated the actual operating conditions and completed the regeneration.
[0060] This invention sets up a comparative test based on the experimental method of regenerating and accumulating nuclides electrostatic desalination membrane reactor, namely, the verification method shown in Figure 2. By simulating the actual working conditions with non-radioactive isotopes, the risk of radioactive operation can be avoided, and complex radiation protection is not required, thereby ensuring the safety of the experimental process.
[0061] Moreover, since the verification method in Figure 2 uses non-radioactive isotopes, the non-radioactive simulated EDI membrane stack can be disassembled and sampled to obtain nuclide distribution data at each location, thus overcoming the limitation that online monitoring cannot penetrate deep into the membrane stack.
[0062] The verification method shown in Figure 2 can fully demonstrate the effectiveness of the experimental method for regenerating accumulated nuclides electrostatic desalination membrane stacks proposed in this application, providing reliable support for the regeneration application of actual radioactive EDI membrane stacks.
[0063] Among them, after disassembling the test EDI membrane stack, the resin sampling points can be referred to Figure 3.
[0064] Specifically, after the above-mentioned EDI membrane stack is disassembled, samples can be taken from the concentrate and desalination chambers near the anode, near the cathode, and in the middle of the EDI membrane stack. Data are obtained by taking samples near the inlet, near the outlet, and in the middle of each position, and the relevant distribution curves of each nuclide at each position of the EDI membrane stack are plotted based on these data.
[0065] The distribution curves of various nuclides at different locations in the EDI membrane stack can visually reflect the concentration differences of nuclides at each location, thereby identifying regions with high nuclide accumulation. Furthermore, by plotting the nuclide distribution curves at each location in the non-radioactive simulation experiment and comparing them with the distribution curves after the regeneration of the radioactive EDI membrane stack, it can be confirmed whether the non-radioactive isotopes can truly simulate the accumulation law of actual nuclides, thus proving the reliability of the simulation experiment data.
[0066] As described above, the experimental method for regenerating accumulated nuclides in an electrostatic desalination membrane stack proposed in this invention involves: Step 1, measuring the nuclides in the EDI membrane stack to be treated to clarify the basic nuclide situation; Step 2, introducing regeneration reagent and monitoring and recording data in real time to achieve preliminary regeneration of the nuclide-contaminated EDI membrane stack; and Step 3, introducing ultrapure water for fine regeneration to ensure the regeneration effect. Ultimately, the radioactivity of the contaminated EDI membrane stack reaches a clean and uncontrolled level, thereby reducing the difficulty of subsequent treatment.
[0067] Meanwhile, through monitoring and data recording during the experiment, key data such as the dosage of regenerative agents and changes in radionuclide concentration are accumulated, providing data support for optimizing the EDI membrane stack regeneration process, guiding its actual operation and maintenance, and extending its service life.
[0068] Referring to Figure 4, this invention also proposes a test system for a regenerating and accumulating nuclide electrostatic desalination membrane stack, employing the above-described test method for the regenerating and accumulating nuclide electrostatic desalination membrane stack. The test system includes: a parallel regeneration reagent delivery path 5 and an ultrapure water delivery path 6, which are connected to a test path 7. A target EDI membrane stack 8 is located on the test path 7. The target EDI membrane stack 8 is either an EDI membrane stack to be treated or a new EDI membrane stack. An energy dispersive spectrometer 13 is connected to the test path.
[0069] Specifically, the regenerative agent delivery path 5 is equipped with a regenerative agent storage tank 1, a drug inlet pump 2, and a first control valve 9; the ultrapure water delivery path 6 is equipped with an ultrapure water tank 3, a water inlet pump 4, and a second control valve 10; the first control valve 9 and the second control valve 10 are used to control the connection and disconnection between the test path 7 and the regenerative agent delivery path 5 or the ultrapure water delivery path 6.
[0070] Furthermore, the experimental flow path 7 is split downstream of the target EDI membrane stack 8 into a clean flow path 11 and a concentration flow path 12. The clean flow path 11 can return to the inlet of the target EDI membrane stack 8, while the concentration flow path 12 is connected to the outside of the target EDI membrane stack 8. Monitoring points (A, B, C, D) are set at the inlet of the target EDI membrane stack 8 and on the clean flow path 11. These monitoring points are communicatively connected to the energy dispersive spectrometer 13, which can monitor the concentration of various nuclides in the target EDI membrane stack in real time. The figure uses four monitoring points as an example, but the specific number is not limited.
[0071] This invention sets up a parallel regeneration agent delivery path 5 and an ultrapure water delivery path 6 before the inlet of the target EDI membrane stack 8. The type of solution introduced into the target EDI membrane stack 8 can be switched by the first control valve 9 and the second control valve 10. In this way, different types of liquids can be introduced into the target EDI membrane stack 8 by switching the first control valve 9 and the second control valve 10 as needed, without having to repeatedly build the test system.
[0072] In other words, the experimental system proposed in this application can not only regenerate the EDI membrane stack to be treated, but also simulate the application of the new EDI membrane stack under actual working conditions.
[0073] A dosing pump 2 is installed on the regenerative reagent delivery path 5, and a water inlet pump 4 is installed on the ultrapure water delivery path 6. By controlling the flow rates of the dosing pump 2 and the water inlet pump 4, the flow rate of the liquid flowing into the EDI membrane stack can be matched with the flow rate that the EDI membrane stack can handle. At the same time, it can be ensured that the pump head is not less than the total pressure drop of the test circuit and not greater than the pressure that the target EDI membrane stack 8 can withstand.
[0074] In addition, the test system is equipped with an online detection system connected to the energy dispersive spectrometer 13, which is used to monitor the conductivity, temperature, pressure and flow rate of the influent, as well as the conductivity, temperature, pressure and flow rate of the clean flow through the contaminated EDI membrane stack.
[0075] In other words, setting up an online monitoring system connected to the energy dispersive spectrometer (EDS) serves to monitor the conductivity, temperature, pressure, and flow rate of the influent and the clean flow from the contaminated EDI membrane stack in real time. This ensures precise and controllable experimental processes. For example, conductivity data confirms the stability of the regenerative reagent concentration and the purity of the ultrapure water, while temperature, pressure, and flow rate data ensure that operating parameters match the EDI membrane stack and do not exceed its tolerance range, preventing membrane stack damage or incomplete regeneration. Furthermore, it assists in judging the regeneration progress and effect. Combined with the EDS monitoring of nuclide concentration, data such as clean flow conductivity confirm whether residual regenerative reagent has been thoroughly rinsed away, providing a basis for subsequent electrostatic regeneration. Simultaneously, the real-time recorded data, along with nuclide concentration changes and regenerative reagent dosage, forms a complete dataset supporting subsequent optimization of the regeneration process.
[0076] In addition, the online monitoring system can also ensure the safety and stability of the test. For example, pressure monitoring can detect pipeline blockage or leakage in a timely manner, and temperature monitoring can ensure resin activity and avoid test interruption or leakage of radioactive nuclides, thereby ensuring that the regeneration test is efficient, safe and reliable.
[0077] Furthermore, flow meters, pressure gauges, thermometers, and other instruments are also installed on the test flow path 7, along with a PLC control cabinet. The start and stop of the relevant electrical components, as well as the display, alarm, and control of the instruments, can be achieved through the PLC control cabinet, which has a standard communication interface for transmitting signals to the user's main control room.
[0078] It should be noted that by installing flow meters, pressure gauges, and thermometers on the test flow path 7, key operating parameters such as flow rate, pressure, and temperature of the fluid within the flow path can be collected in real time. This ensures the compatibility of fluid parameters with the EDI membrane stack, preventing membrane stack damage, insufficient regeneration, or distorted test data due to abnormal parameters. The accompanying PLC control cabinet can centrally control the start and stop of relevant electrical components, as well as display instrument data in real time and provide alarms for abnormalities. This reduces manual intervention, improves the automation level and control accuracy of the test process, and ensures the regeneration test proceeds stably according to the designed process.
[0079] Meanwhile, the standard communication interface reserved in the PLC control cabinet for transmitting signals to the user's main control room can realize the remote transmission of test data and control signals, which facilitates the user to centrally monitor the test status in the main control room. This meets the needs of remote control of equipment operation in scenarios such as nuclear power plants, further ensuring the safety and traceability of the test process, and also provides convenience for the centralized storage of test data and subsequent process optimization analysis.
[0080] In addition, the target EDI membrane stack 8 is also equipped with a DC power supply, which is used to adjust the output voltage and current according to the requirements of the EDI membrane stack and the test requirements.
[0081] It is understood that in the experimental system proposed in this invention, the EDI membrane stack to be treated can be replaced with the experimental EDI membrane stack, and the original regeneration reagent solution can be replaced with the prepared simulation solution, while the rest remains unchanged. In this way, the effect of radionuclide contamination on the EDI membrane stack under actual working conditions can be simulated, which facilitates data collection and comparison.
[0082] Meanwhile, the test system is equipped with safety valves and gate valves in the regeneration agent delivery path, ultrapure water delivery path, and test path, which can be used for maintenance according to actual conditions.
[0083] In summary, the regenerative cumulative nuclide electrostatic desalination membrane stack test system proposed in this invention can obtain the regeneration status of the EDI membrane stack through real-time monitoring by the energy dispersive spectrometer 13 at the inlet and outlet of the EDI membrane stack. It provides a feasible test procedure, which can both regenerate contaminated test EDI membrane stacks and simulate the application of new EDI membrane stacks under actual operating conditions. Furthermore, it allows for mutual verification of the effects of non-radioactive nuclide experiments and radioactive nuclide experiments on EDI membrane stack performance without requiring significant modifications to the test system.
[0084] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "joining", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can also refer to mechanical connections. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0085] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.
[0086] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.
Claims
1. A test method for a regenerative cumulative nuclide electrostatic desalination membrane reactor, characterized in that, include: Step 1: Perform radionuclide measurements on the EDI membrane stack to be treated; Step 2: Continuously introduce regeneration agent into the EDI membrane stack to be treated and monitor the radionuclide content in the EDI membrane stack in real time until the radionuclide content in the EDI membrane stack to be treated meets the requirements. Then record the amount of the regeneration agent introduced and the data on the changes in the concentration of various nuclides. Step 3: Pass ultrapure water through the EDI membrane stack that has met the initial regeneration monitoring requirements for regeneration until the data collected by the energy dispersive spectrometer meets the standard, and the regenerated EDI membrane stack is obtained.
2. The test method for regenerating and accumulating radionuclides using an electrostatic desalination membrane reactor according to claim 1, characterized in that, In step 1, After measuring the radionuclides in the EDI membrane stack to be treated, the types of radionuclides contained in the EDI membrane stack to be treated and the activity concentration of each radionuclide are recorded. Then, according to the power plant's operation requirements, the standards for various radionuclides in the regenerated EDI membrane stack are determined.
3. The experimental method for regenerating and accumulating radionuclides using an electrostatic desalination membrane reactor according to claim 1, characterized in that, After step 1, the method further includes: Using the nuclide types and concentration data obtained in step 1, a solution with the same composition is prepared using non-radioactive isotopes and introduced into a new EDI membrane stack until equilibrium is reached, resulting in at least two experimental EDI membrane stacks; wherein, the nuclide types and their corresponding concentrations in the experimental EDI membrane stacks are consistent with those in the EDI membrane stack to be treated.
4. The test method for regenerating and accumulating radionuclides using an electrostatic desalination membrane reactor according to claim 3, characterized in that, After obtaining the test EDI membrane stack, the same amount of the regeneration agent used in step 2 is introduced into all the test EDI membrane stacks, and one of the regenerated test EDI membrane stacks is disassembled to confirm whether the element content at each location meets the test standards.
5. The test method for regenerating and accumulating radionuclides using an electrostatic desalination membrane reactor according to claim 4, characterized in that, After the test membrane stack meets the test standards, the same amount of ultrapure water as that in the EDI membrane stack to be treated is introduced into the other test EDI membrane stack, and the regenerated test EDI membrane stack is disassembled to confirm whether the element content at each location meets the test standards.
6. The test method for regenerating and accumulating radionuclides using an electrostatic desalination membrane reactor according to claim 1, characterized in that, The regeneration agent is a 5% NaCl solution.
7. The test method for regenerating and accumulating radionuclides using an electrostatic desalination membrane reactor according to claim 1, characterized in that, Step 3 includes: Step 31: First, introduce ultrapure water into the EDI membrane stack to be treated until the online conductivity meter confirms that the residual regeneration agent in the flow channel has been rinsed clean. Step 32: After the residual regeneration agent is rinsed clean, continue to introduce ultrapure water, turn on the DC power supply of the EDI membrane stack to be treated, and use an energy dispersive spectrometer to collect and process data in real time until the energy dispersive spectrometer reading meets the standard.
8. A test system for a regenerative and accumulating nuclide electrostatic desalination membrane reactor, characterized in that, The system employs the experimental method for regenerating and accumulating nuclides using an electrostatic desalination membrane reactor as described in any one of claims 1-7, wherein the system comprises: A parallel regenerative reagent delivery path and an ultrapure water delivery path are provided, wherein the regenerative reagent delivery path and the ultrapure water delivery path are connected to the test flow path, and the target EDI membrane is stacked on the test flow path; wherein... The target EDI membrane stack is either an EDI membrane stack to be processed or a new EDI membrane stack, and an energy dispersive spectrometer is connected to the test flow path.
9. The experimental system for regenerating and accumulating radionuclides using an electrostatic desalination membrane reactor according to claim 8, characterized in that, The regenerative agent delivery path is equipped with a regenerative agent storage tank, an inlet pump, and a first control valve; The ultrapure water delivery path is equipped with an ultrapure water tank, an inlet pump, and a second control valve; The first control valve and the second control valve are used to control the connection between the test flow path and the regeneration agent delivery flow path or the ultrapure water delivery flow path.
10. The experimental system for regenerating and accumulating nuclides using an electrostatic desalination membrane reactor according to claim 8, characterized in that, The test flow path is split into a cleaning flow path and a concentration flow path downstream of the target EDI membrane stack; The cleaning flow path returns to the inlet of the target EDI membrane stack, and the concentration flow path is connected to the outside of the target EDI membrane stack; wherein... Monitoring points are provided at the inlet of the target EDI membrane stack and on the cleaning flow path, and the monitoring points are electrically connected to the energy dispersive spectrometer.