A resin regeneration detection and cutting bed feedback system and method for a fine treatment system

Abstract

This invention discloses a resin regeneration detection and bed-cutting feedback system and method for a fine treatment system. The outlets of the cation and anion resin extraction and storage tanks are connected to the inlet of the resin regeneration detection column. The outlet of the resin regeneration detection column is connected to the inlet of the chloride ion detection system and the inlet of the sodium ion detection system in the water. The outlet of the regeneration detection reagent storage tank is connected to the inlet of the resin regeneration detection column. The fine treatment effluent pipe is connected to the inlet of the electro-regeneration cation exchange device. A first conductivity electrode is installed at the inlet of the electro-regeneration cation exchange device, and a second conductivity electrode is installed at the outlet of the electro-regeneration cation exchange device. This system and method can accurately detect the resin regeneration and thus accurately perform bed-cutting operations.

Description

Technical Field

[0001] This invention belongs to the field of generator set fine treatment operation technology, and relates to a resin regeneration detection and cutting bed feedback system and method for fine treatment system. Background Technology

[0002] Because condensate polishing systems can effectively remove impurities, ions, and corrosion products from condensate, most thermal power units and nuclear power units of 300MW and above are equipped with condensate polishing systems to meet operating water quality requirements and ensure safe unit operation. Currently, the operating process of condensate polishing systems in the power industry still has many technical shortcomings:

[0003] 1) High-speed mixed bed refining system: Expired cation and anion resins in the high-speed mixed bed need to be regenerated in the regeneration system. Due to deviations in processes such as regenerant concentration, regenerant dosage, separation effect, and rinsing time, and even some unidentifiable abnormalities such as regenerant flow deviation and resin loss, the degree of resin regeneration cannot be quantitatively analyzed and is difficult to guarantee consistently.

[0004] 2) To ensure the quality of the treated water, the treatment system is equipped with online monitoring instruments such as (hydrogen) conductivity meters, pH meters, sodium meters, and silica meters. When any of these indicators show abnormalities, operators consider the high-speed mixed bed to have failed and execute a bed-cutting operation. This monitoring system uses a large number of instruments, making it complex and requiring significant maintenance. Furthermore, the accuracy of instruments such as pH, sodium, and silica meters is relatively poor and cannot accurately reflect the quality of the treated water. Cutting the bed too early is detrimental to the unit's economical operation, while cutting it too late can easily lead to water quality exceeding standards, thereby causing problems such as corrosion, scaling, and salt accumulation in the thermal equipment.

[0005] 3) Currently, most power plant fine treatment systems operate in hydrogen form, with an operating cycle of generally 5-7 days. Frequent resin regeneration leads to problems such as large amounts of regenerant, large wastewater discharge, and high resin loss rates, which are detrimental to the economical and environmentally friendly operation of the unit. However, for units with good condensate quality, ammonium form operation can be fully implemented while ensuring resin regeneration. The ammonium form operation cycle can reach more than 30 days, significantly reducing the number of regenerations and effectively achieving energy saving and consumption reduction. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a resin regeneration detection and cutting bed feedback system and method for a fine treatment system. This system and method can accurately detect the resin regeneration and then accurately time the cutting bed operation.

[0007] To achieve the above objectives, the resin regeneration detection and cutting bed feedback system of the fine treatment system of the present invention includes a cation resin extraction and storage tank, an anion resin extraction and storage tank, a resin regeneration detection column, a regeneration detection reagent storage tank, a chloride ion detection system in water, a sodium ion detection system in water, a first conductivity electrode, an electro-regeneration cation exchange device, a second conductivity electrode, and a data acquisition, processing, and feedback integrated system.

[0008] The outlets of the cation exchange resin extraction and storage tank and the anion exchange resin extraction and storage tank are connected to the inlet of the resin regeneration detection column. The outlet of the resin regeneration detection column is connected to the inlet of the chloride ion detection system and the inlet of the sodium ion detection system in the water. The outlet of the regeneration detection reagent storage tank is connected to the inlet of the resin regeneration detection column.

[0009] The purified water outlet pipe is connected to the inlet of the electro-regenerated cation exchange device. A first conductivity electrode is installed at the inlet of the electro-regenerated cation exchange device, and a second conductivity electrode is installed at the outlet of the electro-regenerated cation exchange device. The water chloride ion detection system, the water sodium ion detection system, the first conductivity electrode, the second conductivity electrode, and the electro-regenerated cation exchange device are connected to the data acquisition, processing, and feedback integrated system.

[0010] The outlet of the regeneration test reagent storage tank is connected to the inlet of the resin regeneration test column via the first electromagnetic two-way valve.

[0011] A second electromagnetic two-way valve is installed at the top outlet of the resin regeneration detection column.

[0012] It also includes a first electromagnetic three-way valve, the outlet of the cation resin extraction and storage tank is connected to the first opening of the first electromagnetic three-way valve, the outlet of the anion resin extraction and storage tank is connected to the second opening of the first electromagnetic three-way valve, and the third opening of the first electromagnetic three-way valve is connected to the inlet of the resin regeneration detection column.

[0013] It also includes a second electromagnetic three-way valve, the outlet of the resin regeneration detection column is connected to the first opening of the second electromagnetic three-way valve, the second opening of the second electromagnetic three-way valve is connected to the inlet of the chloride ion detection system in the water, and the third opening of the second electromagnetic three-way valve is connected to the inlet of the sodium ion detection system in the water.

[0014] Both the cation exchange and anion exchange resin extraction and storage tanks are equipped with resin interface detectors.

[0015] A magnetic stirring device is installed in the resin regeneration test column.

[0016] The resin regeneration detection and cutting bed feedback method of the processing system described in this invention includes the following steps:

[0017] 1) The cation resin and anion resin output from the cation resin extraction and storage tank enter the resin regeneration detection column for resin migration. During the resin migration process, the air and water discharged are discharged through the top outlet of the resin regeneration detection column.

[0018] 3) After migration is completed, the regeneration detection reagent tank inputs the regeneration detection reagent into the resin regeneration detection column. The migration products and regeneration detection reagent output from the resin regeneration detection column enter the water chloride ion detection system and the water sodium ion detection system, respectively. The water chloride ion detection system and the water sodium ion detection system detect the chloride ion concentration and sodium ion concentration of the water, respectively.

[0019] 4) The data acquisition, processing and feedback integrated system calculates the regeneration degree of anion resin and cation resin based on the detection results of the chloride ion detection system and sodium ion detection system in the water, and then calculates the pH value corresponding to the excessive sodium and chloride ion levels in the treated water based on the regeneration degree of anion resin and cation resin and the sodium and chloride ion control indicators of the treated water.

[0020] At the same time, the data acquisition, processing, and feedback integrated system calculates the pH value of the refined effluent based on the data detected by the first and second conductivity electrodes. When the pH value of the refined effluent is greater than or equal to the pH value corresponding to the excessive refined effluent, the bed cutting operation is performed.

[0021] The present invention has the following beneficial effects:

[0022] The resin regeneration degree detection and bed-cutting feedback system of the fine treatment system described in this invention utilizes a regeneration degree detection reagent storage tank, a chloride ion detection system, and a sodium ion detection system in water in conjunction to accurately detect the regeneration degree of the resin after regeneration. Operators can clearly understand the resin's treatment capacity without needing to use multiple instruments to monitor multiple indicators of the fine-treated effluent. In addition, this invention only requires the installation of a single computational pH meter at the fine-treated effluent outlet. This instrument monitors the conductivity and hydrogen conductivity of the fine-treated effluent, and the pH is calculated from the conductivity and hydrogen conductivity signals, greatly reducing instrument investment, operating costs, and manual maintenance workload. The conductivity measurement has high accuracy and can accurately provide feedback on the bed-cutting point. Finally, based on the clearly defined resin regeneration degree, as long as the regeneration degree meets the requirements, the fine treatment can operate in ammonium or semi-ammonium form, which can significantly improve the operating cycle and achieve economical and environmentally friendly operation of the unit, effectively achieving the goal of energy saving and consumption reduction. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention.

[0024] Among them, 1 is a cation resin extraction and storage tank, 2 is an anion resin extraction and storage tank, 3 is a first electromagnetic three-way valve, 4 is a resin regeneration detection column, 5 is a second electromagnetic two-way valve, 6 is a regeneration detection reagent storage tank, 7 is a first electromagnetic two-way valve, 8 is a second electromagnetic three-way valve, 9 is a chloride ion detection system in water, 10 is a sodium ion detection system in water, 11 is a first conductivity electrode, 12 is an electro-regeneration cation exchange device, 13 is a second conductivity electrode, and 14 is a data acquisition, processing, and feedback integrated system. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion regarding the concepts disclosed in the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0026] The accompanying drawings show structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0027] refer to Figure 1 The resin regeneration detection and cutting bed feedback system of the fine treatment system of the present invention includes a cation resin extraction and storage tank 1, an anion resin extraction and storage tank 2, a first electromagnetic three-way valve 3, a resin regeneration detection column 4, a second electromagnetic two-way valve 5, a regeneration detection reagent storage tank 6, a first electromagnetic two-way valve 7, a second electromagnetic three-way valve 8, a chloride ion detection system in water 9, a sodium ion detection system in water 10, a first conductivity electrode 11, an electro-regeneration cation exchange device 12, a second conductivity electrode 13, and a data acquisition, processing, and feedback integrated system 14;

[0028] The outlet of the cation resin extraction and storage tank 1 is connected to the first opening of the first electromagnetic three-way valve 3; the outlet of the anion resin extraction and storage tank 2 is connected to the second opening of the first electromagnetic three-way valve 3; the third opening of the first electromagnetic three-way valve 3 is connected to the inlet of the resin regeneration detection column 4; the outlet of the resin regeneration detection column 4 is connected to the first opening of the second electromagnetic three-way valve 8; the second opening of the second electromagnetic three-way valve 8 is connected to the inlet of the chloride ion detection system 9 in water; the third opening of the second electromagnetic three-way valve 8 is connected to the inlet of the sodium ion detection system 10 in water; the outlet of the regeneration detection reagent storage tank 6 is connected to the inlet of the resin regeneration detection column 4 via the first electromagnetic two-way valve 7; and the top outlet of the resin regeneration detection column 4 is connected to the second electromagnetic two-way valve 5.

[0029] The purified water outlet pipe is connected to the inlet of the electro-regenerated cation exchange device 12. A first conductivity electrode 11 is provided at the inlet of the electro-regenerated cation exchange device 12, and a second conductivity electrode 13 is provided at the outlet of the electro-regenerated cation exchange device 12. The first conductivity electrode 11, the second conductivity electrode 13, and the electro-regenerated cation exchange device 12 are connected to the data acquisition, processing, and feedback integrated system 14.

[0030] The specific working process of this invention is as follows:

[0031] 1) After the regeneration process of the failed cation and anion resins is completed, the cation resin extraction and storage tank 1 extracts 100mL of regenerated cation resin from the cation tower of the regeneration system and stores it for later use. The anion resin extraction and storage tank 2 extracts 100mL of regenerated anion resin from the anion tower of the regeneration system and stores it for later use. The resin extraction process extracts water-containing resin with a resin to water volume ratio of 1:1. Both the cation resin extraction and storage tank 1 and the anion resin extraction and storage tank 2 are equipped with resin interface detectors to ensure that the extraction process is completed and shut off after 100mL of resin is extracted.

[0032] 2) Open the first electromagnetic three-way valve 3 and the second electromagnetic two-way valve 8 (at this time, 7 and 8 are in the closed state). The cation resin output from the cation resin extraction and storage tank 1 and the anion resin output from the anion resin extraction and storage tank 2 enter the resin regeneration detection column 4 at a flow rate of 5 ml / min. The use of a low flow rate and the magnetic stirring device contained in the resin regeneration detection column 4 facilitates the uniform mixing of cation resin and anion resin. The air and water that need to be discharged during the resin migration process are discharged through the second electromagnetic two-way valve 5. After the resin migration process is completed, close the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 8.

[0033] 3) Open the first electromagnetic two-way valve 7 and the second electromagnetic three-way valve 8. The regeneration detection reagent storage tank 6 inputs the regeneration detection reagent into the resin regeneration detection column 4 at a flow rate of 25 mL / min. The mixed resin and regeneration detection reagent output from the resin regeneration detection column 4 enter the water chloride ion detection system 9 and the water sodium ion detection system 10 through the second electromagnetic three-way valve 8. The chloride ion detection system 9 and the water sodium ion detection system 10 detect the chloride ion concentration and sodium ion concentration of the water, respectively.

[0034] It should be noted that the regeneration reagent in the regeneration reagent storage tank 6 is a NaCl solution with a concentration of 20-50 μg / L. In addition, it should be noted that any neutral salt solution can be used as the regeneration reagent, as long as the chloride ion detection system 9 and the sodium ion detection system 10 in the water are replaced with the corresponding anion detection system and cation detection system.

[0035] 4) Calculate the regeneration degree of the anion and cation resins based on the detection results of the chloride ion detection system 9 and the sodium ion detection system 10 in the water, respectively; the specific calculation process is as follows:

[0036] The reaction formula for sodium ion adsorption by cation exchange resin is:

[0037] RH+Na + →RNa+H +

[0038] The reaction equation for the adsorption of chloride ions by anions is:

[0039] ROH + Cl - →RCl+OH -

[0040] According to the law of mass action, when the above reaction reaches equilibrium, then:

[0041] [RNa] / [RH] = K1[Na] + ] / [H + ]

[0042] [RCl] / [ROH]=K2[Cl-] / [OH - ]

[0043] Wherein, K1 and K2 are the equilibrium constants of the cation and anion resin adsorption reactions, respectively. These equilibrium constants are related to the neutral salt ion composition, where K1 = 1.5 and K2 = 11.1.

[0044] The water output from resin regeneration detection column 4 is neutral, with a pH of 7. Therefore, [H + ] = [OH - ] = 10 -7 mol / L.

[0045] Based on the above calculation process, the cation exchange resin regeneration degree is:

[0046] Z1=1 / (K1[Na + ] / [H + +1)

[0047] Anion resin regeneration degree is:

[0048] Z2=1 / (K2[Cl - ] / [OH - +1)

[0049] 5) According to GB / T 12145-2016, the sodium ion and chloride ion control indicators for the finely treated effluent are 2μg / L and 1μg / L, respectively. The regeneration detection system transmits the regeneration detection results to the data acquisition, processing, and feedback integrated system 14. The data acquisition, processing, and feedback integrated system 14 calculates the pH value corresponding to the excess of the treated effluent based on the above control indicators and the regeneration detection results. When the pH of the effluent reaches the calculated value, the bed cutting operation can be performed.

[0050] Example 1

[0051] According to the resin regeneration measurement process, the chloride ion detection system 9 and the sodium ion detection system 10 in the water detected the chloride ion and sodium ion concentrations in the water outlet of the resin regeneration detection column 4 to be 1 μg / L and 2 μg / L, respectively. The data acquisition, processing and feedback integrated system 14 calculated that the regeneration rates of the cation and anion resins of this batch were 43.4% and 24.2%, respectively.

[0052] When this resin is used for condensate polishing, and the sodium ion and chloride ion concentrations in the polished effluent reach 2 μg / L and 1 μg / L respectively, the corresponding pH values ​​are:

[0053] pH1=-lg([H + ])=-lg{K1Z1[Na + ] / (1-Z1)}=7

[0054] pH2=-lg([H + ])=-lg(10 -14 / [OH - ])=14-lg{K2Z2[Cl - ] / (1-Z2)}=7

[0055] Based on the above results, the resin regeneration rate is low. When the pH of the treated effluent is 7, the sodium and chloride ion content in the effluent has reached the standard requirements. Therefore, the treatment can only be operated in hydrogen form. When the conductivity of the effluent reaches 0.15 μS / cm, a cutting operation is required.

[0056] According to the calculation results in this embodiment, when the regeneration rate of the cation exchange resin is below 43.4% and the regeneration rate of the anion exchange resin is below 24.2%, the quality of the treated effluent exceeds the standard. Therefore, when the system detects insufficient resin regeneration, the regeneration process should be adjusted to continue regenerating the cation and anion exchange resins. Furthermore, if the treatment process is to be operated in a semi-ammonia or ammonium form, extending the treatment cycle, the regeneration rates of the cation and anion exchange resins should be significantly higher than 43.4% and 24.2%, respectively.

[0057] Example 2

[0058] To achieve ammonium-type operation in the fine treatment system of a certain generator unit, extend the operating cycle of the mixed bed fine treatment system, and achieve economical operation and energy saving, it is necessary to increase the regeneration degree of the cation and anion resins to a certain level. According to the operating process of this unit, the pH of the condensate is generally between 9.0 and 9.4. To ensure that there is no sodium or chlorine leakage (sodium and chloride ion content does not exceed the standard) when the pH of the finely treated effluent reaches 9.4, the regeneration degree of the cation and anion resins needs to reach a high level. The calculation process and results of the regeneration degree requirement are as follows:

[0059] The adsorption process of the cation exchange resin during ammonium form operation is as follows: RNH4 + Na + =RNa+NH4 + .

[0060] Cation resin regeneration degree Z3=1 / (K3[Na) + ] / [NH4 + ]+1)=99.7%. Where K3 is the equilibrium constant of the cation exchange resin adsorption reaction during ammonium-type operation, which is 0.75.

[0061] The adsorption process of the anion resin during ammonium form operation is the same as that during hydrogen form operation: ROH + Cl - =RCl+OH - RCl+OH - .

[0062] Anion resin regeneration degree Z2=1 / (K2[Cl - ] / [OH - ]+1)=98.8%.

[0063] Therefore, when the data acquisition, processing, and feedback integration system 14 detects that the regeneration rates of the cation and anion resins reach 99.7% and 98.8% or higher, respectively, the fine treatment system can achieve ammonium form operation. If the regeneration rate does not meet the requirements, further regeneration processes can be carried out until the regeneration rate meets the requirements. Then, the cation and anion resins can be mixed and transported to a high-speed mixed bed for standby.

[0064] Example 3

[0065] After a resin regeneration at a power plant, the regeneration rates of the cation and anion resins, measured by the resin regeneration measurement system, were 97% and 95%, respectively. If this resin is put into operation, the fine treatment process can achieve a semi-ammonia-type operation. Whether to perform bed-splitting operation is determined based on whether the pH value of the fine treatment effluent exceeds the calculated value.

[0066] According to the formula for calculating the regeneration degree of ammonium-type cation exchange resin, Z3 = 1 / (K3[Na] + ] / [NH4 + ]+1), which can be used to derive and calculate the pH1 of the water quality when the sodium ion content in the treated water exceeds the standard.

[0067] pH1=-lg([H+])=-lg(10-14 / [OH-])=14+lg{K3Z1[Na + ] / (1-Z3)}=8.3

[0068] According to the formula for calculating the regeneration rate of ammonium-type anion resin, Z2 = 1 / (K2[Cl]), the regeneration rate of the anion resin is calculated as follows: Z2 = 1 / (K2[Cl]). - ] / [OH - ]+1), which can be used to derive and calculate the pH2 of the water when the chloride ion content in the treated water exceeds the standard.

[0069] pH2=-lg([H+])=-lg(10-14 / [OH-])=14+lg{K2Z2[Cl - ] / (1-Z2)}=8.8

[0070] Therefore, in order to ensure that the quality of the finely treated effluent does not exceed the standard, the pH of the finely treated effluent should be controlled below 8.3. When the pH test result of the effluent exceeds 8.3, bed treatment is required.

Claims

1. A method for detecting resin regeneration degree and providing feedback from the cutting bed in a fine treatment system, characterized in that, Based on the resin regeneration detection and cutting bed feedback system of the fine treatment system, the resin regeneration detection and cutting bed feedback system of the fine treatment system includes a cation resin extraction and storage tank (1), an anion resin extraction and storage tank (2), a resin regeneration detection column (4), a regeneration detection reagent storage tank (6), a chloride ion detection system in water (9), a sodium ion detection system in water (10), a first conductivity electrode (11), an electro-regeneration cation exchange device (12), a second conductivity electrode (13), and a data acquisition, processing, and feedback integration system (14). The outlet of the cation resin extraction and storage tank (1) and the outlet of the anion resin extraction and storage tank (2) are connected to the inlet of the resin regeneration detection column (4). The outlet of the resin regeneration detection column (4) is connected to the inlet of the chloride ion detection system (9) and the inlet of the sodium ion detection system (10) in water. The outlet of the regeneration detection reagent storage tank (6) is connected to the inlet of the resin regeneration detection column (4). The fine-treated water outlet pipe is connected to the inlet of the electro-regenerated cation exchange device (12). A first conductivity electrode (11) is provided at the inlet of the electro-regenerated cation exchange device (12), and a second conductivity electrode (13) is provided at the outlet of the electro-regenerated cation exchange device (12). The chloride ion detection system (9), the sodium ion detection system (10), the first conductivity electrode (11), the second conductivity electrode (13), and the electro-regenerated cation exchange device (12) are connected to the data acquisition, processing, and feedback integration system (14). Includes the following steps: 1) The cation resin output from the cation resin extraction and storage tank (1) and the anion resin output from the anion resin extraction and storage tank (2) enter the resin regeneration detection column (4) for resin migration. The air and water discharged during the resin migration process are discharged through the top outlet of the resin regeneration detection column (4). 2) After the migration is completed, the regeneration detection reagent storage tank (6) inputs the regeneration detection reagent into the resin regeneration detection column (4). The migration products and regeneration detection reagent output from the resin regeneration detection column (4) enter the water chloride ion detection system (9) and the water sodium ion detection system (10). The chloride ion concentration and sodium ion concentration of the water are detected by the water chloride ion detection system (9) and the water sodium ion detection system (10) respectively. 3) Data acquisition, processing and feedback integrated system (14) calculates the regeneration degree of anion resin and cation resin respectively based on the detection results of chloride ion detection system (9) and sodium ion detection system (10) in water, and then calculates the pH value corresponding to the excess of sodium ion and chloride ion in the finely treated water based on the regeneration degree of anion resin and cation resin and the sodium ion and chloride ion control index of the finely treated water. At the same time, the data acquisition, processing and feedback integrated system (14) calculates the pH value of the finely treated effluent based on the data detected by the first conductivity electrode and the second conductivity electrode. When the pH value of the finely treated effluent is greater than or equal to the pH value corresponding to the excessive finely treated effluent, the bed cutting operation is performed.

2. The method for resin regeneration detection and cutting bed feedback in the fine treatment system according to claim 1, characterized in that, The outlet of the regeneration test reagent storage tank (6) is connected to the inlet of the resin regeneration test column (4) via the first electromagnetic two-way valve (7).

3. The method for resin regeneration detection and cutting bed feedback in the fine treatment system according to claim 2, characterized in that, A second electromagnetic two-way valve (5) is installed at the top outlet of the resin regeneration detection column (4).

4. The method for detecting resin regeneration degree and providing feedback from the cutting bed in the fine treatment system according to claim 1, characterized in that, It also includes a first electromagnetic three-way valve (3), the outlet of the cation resin extraction and storage tank (1) is connected to the first opening of the first electromagnetic three-way valve (3), the outlet of the anion resin extraction and storage tank (2) is connected to the second opening of the first electromagnetic three-way valve (3), and the third opening of the first electromagnetic three-way valve (3) is connected to the inlet of the resin regeneration detection column (4).

5. The method for detecting resin regeneration degree and providing feedback from the cutting bed in the fine treatment system according to claim 4, characterized in that, It also includes a second electromagnetic three-way valve (8), the outlet of the resin regeneration detection column (4) is connected to the first opening of the second electromagnetic three-way valve (8), the second opening of the second electromagnetic three-way valve (8) is connected to the inlet of the chloride ion detection system (9) in water, and the third opening of the second electromagnetic three-way valve (8) is connected to the inlet of the sodium ion detection system (10) in water.

6. The method for detecting resin regeneration degree and providing feedback from the cutting bed in the fine treatment system according to claim 1, characterized in that, Both the cation resin extraction and storage tank (1) and the anion resin extraction and storage tank (2) are equipped with resin interface detectors.

7. The method for detecting resin regeneration degree and providing feedback from the cutting bed in the fine treatment system according to claim 1, characterized in that, A magnetic stirring device is installed in the resin regeneration test column (4).

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