A polishing resin regeneration simulation test device and test method

Abstract

The application discloses a kind of fine treatment resin regeneration simulation test device and test method, belong to water treatment and ion exchange resin technical field.The device includes simulation column, simulation water sample supply unit, regenerant supply unit, flushing unit, on-line monitoring instrument and control unit.Control unit pre-regeneration parameter and automatically control each unit sequentially execute invalid, regeneration and flushing step, on-line monitoring instrument real-time acquisition effluent quality signal, control unit according to pre-set end point determination index automatic switching step.In the test process, multiple comparison tests can be carried out by changing a single or multiple regeneration parameters, and the optimal regeneration process parameters are determined by combining real-time data and resin sampling analysis results throughout the process.The application realizes high simulation and full-process automatic accurate control of industrial regeneration process pressure, temperature and dynamic conditions, has good test repeatability, and can provide basis for optimization of fine treatment resin regeneration process.

Description

Technical Field

[0001] This application belongs to the field of water treatment and ion exchange resin technology, specifically relating to a simulation test device and test method for regenerating fine treatment resin. Background Technology

[0002] Ion exchange resin is the core medium in a fine treatment system, used to remove impurity ions from water and ensure water quality. After the resin becomes saturated, it needs to be chemically regenerated to restore its exchange capacity. The regeneration effect directly affects the resin's operating cycle, effluent quality, and operating costs. Currently, on-site regeneration process parameters (such as regenerant concentration, temperature, flow rate, and steps) are mostly based on experience or general recommendations from resin suppliers, lacking simulation experimental devices and methods to study the impact of regenerant type, concentration, temperature, flow rate, and step optimization on regeneration effectiveness. In the laboratory, traditional small-scale glass column experiments cannot simulate actual pressure, temperature, and dynamic processes, and have low automation and incomplete data acquisition, making it difficult to systematically and accurately study complex regeneration processes.

[0003] Therefore, there is an urgent need for a simulation test device and test method for the regeneration of refined resin that can highly simulate industrial field conditions, realize automatic process control and online monitoring of multiple parameters, so as to provide a scientific basis for the optimization of the regeneration process. Summary of the Invention

[0004] The purpose of this application is to provide a simulation test device and test method for the regeneration of refined resin, so as to solve the technical problem that the existing regeneration process parameters of refined resin mostly rely on empirical presets and lack the ability to highly simulate the pressure, temperature and dynamic process of industrial site.

[0005] To achieve the above objectives, this application adopts the following technical solution: This application provides a simulation test device for the regeneration of fine-treated resin, comprising: A simulated column, the interior of which is filled with resin, has an inlet at the top and an outlet at the bottom; The simulated water sample resin failure unit is connected to the inlet of the simulated column and is used to provide the simulated water sample with a preset temperature and flow rate to the simulated column. A regenerant supply unit is connected to the inlet of the simulated column and is used to supply the simulated column with a regenerant having a preset temperature and flow rate. The rinsing unit is connected to the liquid inlet of the simulated column and is used to provide the simulated column with rinsing water having a preset temperature and flow rate. The effluent detection unit is connected to the liquid outlet of the simulated column and is used to collect signals that characterize the quality indicators of the effluent flowing through it in real time. The control unit is electrically connected to the simulated water sample resin failure unit, the regenerant supply unit, the rinsing unit, and the effluent detection unit, respectively. The control unit is used to preset regeneration test parameters, control the operation of each unit, and receive signals from the effluent detection unit to automatically switch test steps according to preset endpoint determination indicators.

[0006] Furthermore, the simulated column is provided with an insulation jacket on the outside, and the side wall of the simulated column is provided with at least three sampling ports along the height direction for obtaining resin samples of different bed heights.

[0007] Furthermore, each of the simulated water sample resin failure unit, regenerant supply unit, and rinsing unit includes a storage tank and a metering pump connected in sequence; a first flow meter, a constant temperature device, and a thermometer are installed on the pipeline between the collected water from the simulated water sample resin failure unit, regenerant supply unit, and rinsing unit and the simulated column.

[0008] Furthermore, the simulated column is provided with an exhaust port at the top and an air inlet at the bottom. The air inlet is connected to a compressed air source through an air inlet regulating valve, which is used to introduce compressed air into the simulated column to disturb the resin bed.

[0009] Furthermore, the effluent detection unit includes an online conductivity monitoring branch, an online pH monitoring branch, an online acidity monitoring branch, and an online alkalinity monitoring branch.

[0010] Furthermore, the simulated water sample resin failure unit includes a storage tank containing an ammonia solution; the regenerant supply unit includes two independent supply branches containing hydrochloric acid solution and sodium hydroxide solution, respectively.

[0011] This application also provides a method for simulating the regeneration of refined resin using the above-mentioned apparatus, comprising the following steps: The regeneration test parameters are preset in the control unit. The parameters include the concentration, temperature, flow rate, and total volume of the regenerant, the temperature and flow rate of the rinsing water, and the endpoint determination index for each step. The control unit controls the simulated water sample resin failure unit to inject the simulated water sample into the simulated column to execute the resin failure process; The control unit controls the regenerant supply unit to inject regenerant into the simulated column to perform the resin regeneration process; Once the control unit determines that the regeneration process has reached its end based on the signal from the effluent detection unit, it controls the flushing unit to inject flushing water into the simulated column to execute the flushing process. The water quality data during the experiment is collected in real time by the effluent detection unit and transmitted to the control unit. Combined with resin sampling and analysis, the regeneration effect is evaluated.

[0012] Furthermore, before performing the resin regeneration process, a resin scrubbing step is also included: the control unit controls the air intake regulating valve to open, so that compressed air is introduced from the air intake at the bottom of the simulated column to agitate and scrub the resin.

[0013] Furthermore, the resin regeneration process is specifically performed as follows: When regenerating cation resin, the control unit controls the regenerant supply unit to inject hydrochloric acid solution and receives signals from the online pH meter and online acidity meter. When the acidity signal value is ≥ the third preset value and the pH signal value is ≤ the fourth preset value, the regeneration process is determined to be complete. When regenerating anion resin, the control unit controls the regenerant supply unit to inject sodium hydroxide solution and receives signals from the online pH meter and online alkalinity meter. When the alkalinity signal value is ≥ the fifth preset value and the pH signal value is ≥ the sixth preset value, the regeneration process is determined to be complete.

[0014] Furthermore, the rinsing process is specifically performed as follows: the control unit controls the rinsing unit to inject demineralized water and receives a signal from the online conductivity meter. When the conductivity signal value is ≤ a seventh preset value, the rinsing process is determined to be complete.

[0015] Compared with the prior art, this application has the following beneficial effects: The refined resin regeneration simulation test device provided by this invention integrates a simulation column, a simulated water sample resin failure unit, a regenerant supply unit, a rinsing unit, an effluent detection unit, and a control unit into a unified automated test system. This system can highly simulate the pressure, temperature, and dynamic regeneration process in an industrial setting. The independent and controllable design of the simulation column, along with each supply unit, allows the multi-step processes such as failure, regeneration, and rinsing to be executed automatically according to a preset sequence, effectively avoiding errors caused by manual operation and significantly improving the repeatability and accuracy of the test. Simultaneously, the effluent detection unit collects effluent water quality signals in real time and feeds them back to the control unit. The control unit automatically switches test steps based on preset endpoint determination indicators, achieving intelligent and precise determination of the regeneration process endpoint, overcoming the subjectivity and lag of traditional manual endpoint determination. This device provides a reliable hardware foundation for systematically studying the impact of process parameters such as regenerant type, concentration, temperature, and flow rate on the regeneration effect.

[0016] This method for simulating resin regeneration achieves precise control of regeneration conditions and synchronous data acquisition throughout the process by automatically executing failure, regeneration, and rinsing steps through a control unit that presets regeneration test parameters. The method utilizes real-time feedback water quality signals from the effluent detection unit and automatic comparison with preset endpoint criteria to achieve intelligent switching between test steps, ensuring high consistency and repeatability of test conditions for each test. Furthermore, by changing one or more regeneration test parameters, multiple sets of comparative tests can be conducted, systematically separating and evaluating the independent influence of various factors on the regeneration effect, thereby scientifically determining the optimal combination of process parameters. This method can effectively guide the optimization of key parameters such as regenerant concentration, temperature, and flow rate in industrial production, reducing chemical consumption and operating costs while ensuring resin regeneration effectiveness, and has significant application value. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the resin regeneration simulation test device of the present invention; The components include: 1. Ammonia storage tank; 2. First inlet valve; 3. First metering pump; 4. Hydrochloric acid storage tank; 5. Second inlet valve; 6. Second metering pump; 7. Sodium hydroxide storage tank; 8. Third inlet valve; 9. Third metering pump; 10. Demineralized water storage tank; 11. Fourth inlet valve; 12. Fourth metering pump; 13. First flow meter; 14. Thermostatic device; 15. Thermometer; 16. Simulated column; 17. Upper sealing end cap; 18. Exhaust port; 19. Exhaust valve; 20. Insulation jacket; 21. Water distribution device; 22. Resin. 23. Sampling port; 24. Fine-treated resin; 25. Precision filter; 26. Lower sealing end cap; 27. Fixing bracket; 28. Air inlet; 29. ​​Air inlet regulating valve; 30. Drain valve; 31. First injection valve; 32. Second flow meter; 33. Online conductivity meter; 34. Third flow meter; 35. Online pH meter; 36. Third injection valve; 37. Fourth flow meter; 38. Online acidity meter; 39. Fourth injection valve; 40. Fifth flow meter; 41. Online alkalinity meter; 42. Control unit. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In existing technologies, the regeneration process parameters for refining resins largely rely on general recommendations from resin suppliers or experience-based presets by on-site operators, lacking systematic optimization methods tailored to specific resin conditions and on-site operating conditions. Traditional laboratory research methods typically employ small glass exchange columns for simple simulation experiments at atmospheric pressure and room temperature. Such devices cannot simulate the actual pressure, temperature, and dynamic flow conditions of industrial settings. Furthermore, the switching of regeneration steps depends on manual operation and subjective judgment, resulting in low automation. Data acquisition during the experiment is scattered and incomplete, making it difficult to continuously and synchronously monitor and record key information such as water quality changes and resin bed conditions during the regeneration process online. These shortcomings prevent existing technologies from scientifically and accurately studying the coupled effects of multiple variables such as regenerant concentration, temperature, flow rate, and timing on regeneration efficiency, thus failing to provide a reliable basis for optimizing the regeneration process of industrial refining systems.

[0021] Based on this, such as Figure 1 As shown, the present invention provides a simulation test device for regenerating fine resin, including a simulation column 16, which is used to fill resin inside. The top of the simulation column 16 is provided with a liquid inlet and an exhaust outlet 18, and the bottom is provided with a liquid outlet and an air inlet 27. The simulated water sample resin failure unit is connected to the inlet of the simulated column 16 and is used to provide the simulated water sample with a preset temperature and flow rate to the simulated column 16. The regenerant supply unit is connected to the inlet of the simulation column 16 and is used to supply the simulation column 16 with regenerant at a preset temperature and flow rate. The rinsing unit is connected to the inlet of the simulated column 16 and is used to provide the simulated column 16 with rinsing water at a preset temperature and flow rate. The effluent detection unit is connected to the liquid outlet of the simulated column 16 and is used to detect the effluent water quality indicators in real time. The control unit 42 is electrically connected to the simulated water sample resin failure unit, the regenerant supply unit, the rinsing unit, and the effluent detection unit, respectively. The control unit 42 is used to preset the regeneration test parameters, control the operation of each unit, and receive the real-time detection of effluent water quality indicators from the effluent detection unit, so as to automatically switch the test steps according to the preset endpoint judgment indicators.

[0022] Specifically, the main body of the simulation column 16 is made of corrosion-resistant transparent material, and its working pressure can reach 0.6 MPa. The top of the simulation column 16 is an upper sealing end cap 17, which has a liquid inlet for receiving liquid from the simulated water sample resin failure unit, regenerant supply unit, or flushing unit. The upper sealing end cap 17 also has an exhaust port 18, and an exhaust valve 19 is installed on the exhaust pipe to discharge air from the column during liquid injection and initial operation, preventing air resistance from affecting the flow field distribution. The bottom of the simulation column 16 is a lower sealing end cap 25, which has a liquid outlet. The lower sealing end cap 25 also has an air inlet 27, which is connected to a compressed air source through an air inlet regulating valve 28 to introduce compressed air into the simulation column 16 to agitate the resin bed. A water distribution device 21 is installed at the upper part of the interior of the simulated column 16. The water distribution device 21 is used to ensure that the liquid entering the simulated column 16 flows evenly into the fine treatment resin 23. A precision filter screen 24 is installed at the bottom of the interior of the simulated column 16. The pore size of the precision filter screen 24 is smaller than the particle size of the fine treatment resin 23 to prevent resin particles from being lost. The simulated column 16 is placed on a fixed support 26, maintaining a certain distance from the ground, and air intake and water outlet are achieved from the bottom of the simulated column 16.

[0023] Specifically, a first flow meter 13, a constant temperature device 14, and a thermometer 15 are installed on the pipeline between the simulated water sample resin failure unit, the regenerant supply unit, the flushing unit and the simulated column 16. The constant temperature device 14 can maintain the water sample temperature at 5~80℃ to simulate water temperature conditions under different seasons or working conditions.

[0024] Specifically, the simulated water sample resin failure unit includes an ammonia storage tank 1, a first inlet valve 2, and a first metering pump 3. The ammonia storage tank 1 contains an ammonia solution of 0.1 mg / L to 5.0 mg / L, used to simulate the failure process of the cation exchange resin; the first metering pump 3 can adjust the flow rate of ammonia injected into the simulated column 16 under the control of the control unit 42, with the ammonia flow rate adjusted between 0 and 100 L / h.

[0025] Specifically, the regenerant supply unit includes two independently controllable supply branches: one is a hydrochloric acid supply branch, including a hydrochloric acid storage tank 4, a second inlet valve 5, and a second metering pump 6; the other is a sodium hydroxide supply branch, including a sodium hydroxide storage tank 7, a third inlet valve 8, and a third metering pump 9. The hydrochloric acid storage tank 4 contains a hydrochloric acid solution with a mass concentration of 3% to 5%; the sodium hydroxide storage tank 7 contains a sodium hydroxide solution with a mass fraction of 3% to 5%. The second metering pump 6 and the third metering pump 9 can be controlled and adjusted by the control unit 42 to regulate the regenerant flow rate injected into the simulated column 16, with the regenerant flow rate adjusted between 0 and 100 L / h.

[0026] Specifically, the flushing unit includes a demineralized water storage tank 10, a fourth inlet valve 11, and a fourth metering pump 12. The demineralized water storage tank 10 contains a sufficient amount of demineralized water. The fourth metering pump 12 can be controlled and adjusted by the control unit 42 to inject demineralized water into the simulated column 16, with the demineralized water flow rate adjusted between 0 and 100 L / h.

[0027] Specifically, the effluent detection unit consists of multiple parallel branches that distribute the effluent to various monitoring instruments. The effluent detection unit includes an online conductivity monitoring branch, an online pH monitoring branch, an online acidity monitoring branch, an online alkalinity monitoring branch, and an effluent flow control branch. Specifically, the online conductivity monitoring branch is connected to the inlet of the measuring cell of the online conductivity meter 32 via a first sampling valve 30 and a second flow meter 31; the online pH monitoring branch is connected to the inlet of the measuring cell of the online pH meter 35 via a second sampling valve 33 and a third flow meter 34; the online acidity monitoring branch is connected to the inlet of the measuring cell of the online acidity meter 38 via a third sampling valve 36 and a fourth flow meter 37; the online alkalinity monitoring branch is connected to the inlet of the measuring cell of the online alkalinity meter 41 via a fourth sampling valve 39 and a fifth flow meter 40; a drain valve 29 is installed on the effluent flow control branch to control the flow rate of other monitoring branches during the test. The outlets of the measuring cells of each instrument all lead to a waste liquid collection point. These instruments are used to collect real-time data characterizing the conductivity, pH, acid concentration, and alkali concentration of the regenerated effluent, and generate electrical signals that are transmitted to the control unit 42. Each branch sample is diverted from the main stream, ensuring independent sampling and guaranteeing the stability and accuracy of each instrument's measurements. By adjusting the inlet valves and flow meters, the flow rate entering each instrument can be controlled within its operating range. The four branches can comprehensively assess the regeneration process from different water quality indicators, improving the reliability and accuracy of endpoint determination.

[0028] Specifically, the control unit 42 is electrically connected to the first metering pump 3, the second metering pump 6, the third metering pump 9, the fourth metering pump 12, the thermostat 14, all inlet valves, the air inlet regulating valve 28, and each outlet water detection unit. The control unit 42 is used to preset regeneration test parameters (such as regenerant concentration, flow rate, temperature, and endpoint determination indicators for each step) before the test. During the test, it sends control commands to each pump, valve, and thermostat 14 to control the operation of each unit and receives signals from the outlet water detection units in real time. The internal program of the control unit 42 continuously compares the received signal values ​​with the preset endpoint determination indicators. When the signal value meets the conditions, it automatically stops the current step and starts the next test step.

[0029] In some specific embodiments, the simulated column 16 is provided with an insulation jacket 20, which reduces heat exchange between the liquid inside the column and the external environment, ensuring that the experiment is conducted under precise temperature conditions. The sidewall of the simulated column 16 has at least two sampling ports along its height for obtaining resin samples at different bed heights. The presence of at least two sampling ports allows for the acquisition of small quantities of resin samples at different bed heights using a dedicated sampler without interrupting the experiment, enabling researchers to analyze the uniformity of the regeneration process at different heights of the resin bed. The sidewall of the simulated column 16 also has three resin sampling ports 22 along its height. These three sampling ports are located at the upper, middle, and lower layers of the resin bed, respectively.

[0030] A method for simulating the regeneration of fine-treatment resin based on the above-mentioned fine-treatment resin regeneration simulation test device includes the following steps: Presetting regeneration test parameters in the control unit 42, including the concentration, temperature, flow rate, and total volume of the regenerant, the temperature and flow rate of the rinsing water, and the endpoint determination indicators for each step; the control unit 42 controls the simulated water sample resin failure unit to inject the simulated water sample into the simulated column 16 to execute the resin failure process; the control unit 42 controls the regenerant supply unit to inject the regenerant into the simulated column 16 to execute the resin regeneration process; when the control unit 42 determines that the regeneration process has reached its endpoint based on the signal from the effluent detection unit, it controls the rinsing unit to inject rinsing water into the simulated column 16 to execute the rinsing process; the effluent detection unit collects water quality data in real time during the test and transmits it to the control unit 42, combining this with resin sampling analysis to complete the regeneration effect evaluation.

[0031] This experimental method involves conducting multiple comparative experiments by changing at least one regeneration test parameter, and systematically studying the influence of various factors on the regeneration effect based on the data recorded by the control unit 42 and / or the results of resin sampling analysis, in order to find the optimal process parameters.

[0032] The simulation test method for regenerating fine-treated resin specifically includes the following steps: (1) Resin filling: A certain volume of resin is filled into the simulated column 16, about 20-50 mm above the top resin sampling port 222. The regeneration test parameters are set in the control unit 42, including the type, concentration, flow rate, temperature, total volume of regenerant, as well as the flow rate, temperature, and endpoint determination index of the rinsing water.

[0033] (2) Resin failure process: The control unit 42 controls the injection of ammonia into the simulated water sample resin failure unit and receives signals from the online conductivity meter 32 and the online pH meter 35. When the conductivity signal value is ≥ the first preset value and the pH signal value reaches or exceeds the second preset value, the rinsing process is considered complete. Specifically, for cation resin, the ammonia storage tank 1, the first inlet valve 2, and the first metering pump 3 are opened. A certain concentration of ammonia solution is then passed through the first flow meter 13 and the constant temperature device 14, and then evenly through the fine-treatment resin 23 from the top of the simulated column 16 via the water distribution device 21. The first injection valve 30, the second flow meter 31, the second injection valve 33, and the third flow meter 34 are opened. The flow rate of the online conductivity meter 32 and the online pH meter 35 is adjusted to 5~15L / h through the drain valve 29. The control unit 42 collects the measurement data of the online conductivity meter 32 and the online pH meter 35 in real time. For example, when the conductivity SC ≥ 1μS / cm and the pH ≥ 8.5, the resin can be considered to have completed failure.

[0034] (4) Resin Scrubbing: The control unit 42 controls the air intake regulating valve 28 to open, allowing compressed air to enter through the air intake port 27 at the bottom of the simulated column 16 to agitate and scrub the resin. Specifically, the exhaust valve 19 is opened, and the compressed air is introduced into the simulated column 16 through the air intake port 27 at a certain flow rate using the air intake regulating valve 28. A water layer of approximately 10-30 mm should be maintained at the top of the resin to ensure thorough and uniform mixing of the resin; the compressed air flow rate is set to 3.0-4.0 Nm. 3 / m 2 •min, the single scrubbing time is 1min~2min.

[0035] (5) Resin regeneration process: When regenerating cation resin, the control unit 42 controls the regenerant supply unit to inject hydrochloric acid solution and receives signals from the online pH meter 35 and the online acidity meter 38. When the acidity signal value is ≥ the third preset value and the pH signal value is ≤ the fourth preset value, the regeneration process is determined to be completed. When regenerating anion resin, the control unit 42 controls the regenerant supply unit to inject sodium hydroxide solution and receives signals from the online pH meter 35 and the online alkalinity meter 41. When the alkalinity signal value is ≥ the fifth preset value and the pH signal value is ≥ the sixth preset value, the regeneration process is determined to be completed. Specifically: a) For cation resin regeneration, open the second inlet valve 5 and the second metering pump 6. Hydrochloric acid of a certain concentration, after passing through the first flow meter 13 and the constant temperature device 14, is evenly distributed from the top of the simulated column 16 through the water distribution device 21 to the fine-treatment resin 23. Open the second injection valve 33, the third flow meter 34, the third injection valve 36, and the fourth flow meter 37. Adjust the flow rate of the online pH meter 35 and the online acidity meter 38 through the drain valve 29 to control it at 5~15 L / h. The control unit 42 collects the measurement data of the online pH meter 35 and the online acidity meter 38 in real time. Taking 4% hydrochloric acid as an example, if the effluent hydrochloric acid concentration is ≥3.8% and the pH is ≤0.2, the cation resin regeneration is considered complete. (b) For anion resin regeneration, open the third inlet valve 8 and the third metering pump 9. Sodium hydroxide of a certain concentration, after passing through the first flow meter 13 and the constant temperature device 14, is evenly distributed from the top of the simulated column 16 through the water distribution device 21 to the fine-treatment resin 23. Open the second injection valve 33, the third flow meter 34, the fourth injection valve 39, and the fifth flow meter 40. Adjust the flow rate of the online pH meter 35 and the online alkalinity meter 41 through the drain valve 29 to control it at 5~15 L / h. The control unit 42 collects the measurement data of the online pH meter 35 and the online alkalinity meter 41 in real time. Taking 4% sodium hydroxide as an example, if the effluent alkalinity concentration is ≥3.8% and the pH is ≥13.8, the anion resin regeneration is considered complete.

[0036] (6) Rinsing process: The control unit 42 controls the rinsing unit to inject demineralized water and receives the signal from the online conductivity meter 32. When the conductivity signal value is ≤ the seventh preset value, the rinsing process is considered complete. Specifically, the fourth inlet valve 11 and the fourth metering pump 12 are opened, and the demineralized water is evenly distributed from the top of the simulated column 16 through the water distribution device 21 after passing through the first flow meter 13 and the constant temperature device 14. The second injection valve 33 and the third flow meter 34 are opened, and the flow rate of the online conductivity meter 32 is adjusted to 5~15L / h through the drain valve 29. The control unit 42 collects the measurement data of the online conductivity meter 32 in real time. When the conductivity SC ≤ 3μS / cm, the resin rinsing is considered complete.

[0037] (7) Resin sampling: After regeneration, replacement and rinsing, the resin in the upper, middle and lower layers can be sampled from the sampling port 22 respectively. Alternatively, the resin wiping step can be repeated to mix the resin evenly before sampling and analysis.

[0038] Example 1: Optimize the alkali regeneration process of a mixed-bed anion exchange resin in a power plant: S1: 5L of failed anion resin is loaded into the simulated column 16 and air-washed to loosen and evenly mix the resin bed.

[0039] S2: Set the test plan in control unit 42: fix the alkali concentration at 4% and the flow rate at 3m³ / h. 3 Three comparative experiments were conducted with varying alkaline solution temperatures (30℃, 40℃, 50℃) per hour. The rinsing endpoint was set as conductivity SC ≤ 3μS / cm.

[0040] S3: Start the first test group (30℃). Open the third inlet valve 8 and the third metering pump 9. The thermostat 14 pumps the 30℃ alkaline solution at a rate of 3m... 3 A flow rate of 5-15 L / h is generated from the top of the simulated column 16, evenly distributed through the water distribution device 21 to the fine treatment resin 23. The second and fourth injection valves 33 and 39 are opened, and the flow rates of the online pH meter 35 and online alkalinity meter 41 are adjusted via the drain valve 29 to maintain a flow rate of 5-15 L / h. The control unit 42 collects real-time measurement data from the online pH meter 35 and online alkalinity meter 41. When the effluent alkalinity concentration is ≥3.8% and the pH is ≥13.8, the anion resin regeneration is considered complete.

[0041] S4: After the third metering pump 9 stops, switch to the regeneration, replacement, and rinsing sequence. Open the fourth inlet valve 1111 and the fourth metering pump 12. The demineralized water is then fed through the first flow meter 13 and the constant temperature device 14, and then evenly through the fine treatment resin 23 from the top of the simulated column 16 via the water distribution device 21. Open the second injection valve 33, and adjust the flow rate of the online conductivity meter 32 to 5~15L / h through the drain valve 29. The control unit 42 collects the measurement data of the online conductivity meter 32 in real time. When the conductivity SC≤3μS / cm, the resin rinsing is considered complete.

[0042] S5: Take resin samples from the upper, middle and lower layers and the mixed resin sample from the resin sampling port 22 respectively, and determine their ion exchange capacity.

[0043] Repeat steps S2-S5 to complete the tests at 40℃ and 50℃. The results show that under these conditions, the resin regenerated at 40℃ has the highest ion exchange capacity, which is about 5% higher than that at 30℃. However, the ion exchange capacity decreases slightly at 50℃.

[0044] Through testing, the optimal alkali regeneration temperature for this batch of anion exchange resin at the power plant was determined to be 40℃. Field application verified improved regeneration efficiency and reduced alkali consumption by approximately 15%.

[0045] Specific examples in this embodiment can be found in the examples described in the above embodiments and exemplary implementations, and will not be repeated here.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0048] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0049] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0050] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A simulation test device for regenerating refined resin, characterized in that, include: The simulated column (16) is used to fill the interior with resin. The simulated column (16) has an inlet at the top and an outlet at the bottom. The simulated water sample resin failure unit is connected to the inlet of the simulated column (16) and is used to provide the simulated water sample with a preset temperature and flow rate to the simulated column (16). The regenerant supply unit is connected to the inlet of the simulated column (16) and is used to supply the simulated column (16) with a regenerant having a preset temperature and flow rate. The rinsing unit is connected to the inlet of the simulated column (16) and is used to provide the simulated column (16) with rinsing water having a preset temperature and flow rate. The effluent detection unit is connected to the outlet of the simulated column (16) and is used to collect signals that characterize the quality indicators of the effluent flowing through it in real time. The control unit (42) is electrically connected to the simulated water sample resin failure unit, regenerant supply unit, rinsing unit and effluent detection unit respectively; the control unit (42) is used to preset regeneration test parameters, control the operation of each unit, and receive the signal from the effluent detection unit to automatically switch test steps according to the preset endpoint judgment index.

2. The resin regeneration simulation test apparatus according to claim 1, characterized in that, The simulated column (16) is provided with an insulation jacket (20) on the outside, and the side wall of the simulated column (16) is provided with at least three sampling ports along the height direction for obtaining resin samples of different bed heights.

3. The simulation test apparatus for regenerating fine-treated resin according to claim 1, characterized in that, Each of the simulated water sample resin failure unit, regenerant supply unit and rinsing unit includes a storage tank and a metering pump connected in sequence; a first flow meter (13), a constant temperature device (14) and a thermometer (15) are installed on the pipeline between the simulated water sample resin failure unit, regenerant supply unit and rinsing unit and the simulated column (16).

4. The simulation test apparatus for regenerating fine-treated resin according to claim 1, characterized in that, The simulated column (16) has an exhaust port (18) at the top and an air inlet (27) at the bottom. The air inlet (27) is connected to a compressed air source through an air inlet regulating valve (28) to introduce compressed air into the simulated column (16) to disturb the resin bed.

5. The simulation test apparatus for regenerating fine-treated resin according to claim 1, characterized in that, The effluent detection unit includes an online conductivity monitoring branch, an online pH monitoring branch, an online acidity monitoring branch, and an online alkalinity monitoring branch.

6. The simulation test apparatus for regenerating fine-treated resin according to claim 1, characterized in that, The simulated water sample resin failure unit includes a storage tank containing an ammonia solution; the regenerant supply unit includes two independent supply branches containing hydrochloric acid solution and sodium hydroxide solution, respectively.

7. A method for simulating the regeneration of refined resin, characterized in that, The apparatus for simulating the regeneration of refined resin according to any one of claims 1-6 comprises the following steps: In the control unit (42), the regeneration test parameters are preset, including the concentration, temperature, flow rate, and total volume of the regenerator, the temperature and flow rate of the rinsing water, and the endpoint determination index of each step. The control unit (42) controls the simulated water sample resin failure unit to inject the simulated water sample into the simulated column (16) to perform the resin failure process; The control unit (42) controls the regenerant supply unit to inject regenerant into the simulated column (16) to perform the resin regeneration process; When the control unit (42) determines that the regeneration process has reached its end based on the signal from the effluent detection unit, it controls the flushing unit to inject flushing water into the simulated column (16) to execute the flushing process. The water quality data during the test is collected in real time by the effluent detection unit and transmitted to the control unit (42). Combined with resin sampling and analysis, the regeneration effect is evaluated.

8. The method for simulating the regeneration of refined resin according to claim 1, characterized in that, Before performing the resin regeneration process, a resin scrubbing step is also included: the control unit (42) controls the air intake regulating valve (28) to open, so that compressed air is introduced from the air intake (27) at the bottom of the simulated column (16) to agitate and scrub the resin.

9. The method for simulating the regeneration of refined resin according to claim 1, characterized in that, The resin regeneration process is specifically performed as follows: When regenerating cation resin, the control unit (42) controls the regenerator supply unit to inject hydrochloric acid solution and receives signals from the online pH meter (35) and the online acidity meter (38). When the acidity signal value is ≥ the third preset value and the pH signal value is ≤ the fourth preset value, the regeneration process is determined to be completed. When regenerating anion resin, the control unit (42) controls the regenerator supply unit to inject sodium hydroxide solution and receives signals from the online pH meter (35) and the online alkalinity meter (41). When the alkalinity signal value is ≥ the fifth preset value and the pH signal value is ≥ the sixth preset value, the regeneration process is determined to be completed.

10. The method for simulating the regeneration of refined resin according to claim 1, characterized in that, The specific execution of the rinsing process is as follows: the control unit (42) controls the rinsing unit to inject demineralized water and receives the signal from the online conductivity meter (32). When the conductivity signal value is ≤ the seventh preset value, the rinsing process is determined to be completed.

Images