Ion exchange resin purification simulation test device and test method for nuclear power plant

Abstract

The present invention discloses a nuclear power plant ion exchange resin purification simulation test device, including a water supply module, a dosing module, a temperature control module, a test module, an online monitoring module, a purification module, a control module and a data acquisition module. The water supply module is used to store liquid and send the liquid into a pipeline to form a fluid, the dosing module is used to add a reagent to the pipeline, the temperature control module is used to control the temperature of the liquid, the test module includes a test ion exchange resin bed, the online monitoring module is used to detect various data of the fluid in the pipeline, the control module is used to connect and control the water supply pump and the dosing module, and the data acquisition module is used to connect with the online monitoring module and collect test data. The nuclear power plant ion exchange resin purification simulation test device of the present application can simulate the normal operation water quality of the power plant and evaluate the purification capacity of different ion exchange resins.

Description

Technical Field

[0001] The invention belongs to the technical field of ion exchange resin bed purification performance evaluation, and specifically relates to a test device for dynamic simulation of ion exchange resin purification in a nuclear power plant and a test method for dynamic simulation of ion exchange resin purification using the test device. Background Art

[0002] The main purpose of the secondary circuit water chemistry control of nuclear power plants is to reduce corrosion and reduce the migration of corrosion products. In the process of water quality control, the less impurities in the water, the better. During the operation of the unit, this goal is achieved through the ion exchange resin purification system designed for the unit (such as condensate polishing system and steam generation sewage system). With the continuous updating of ion exchange resins, it is necessary to select and evaluate the purification performance of new ion exchange resins. In addition, the update of secondary circuit alkalization technology and the increase in regional water temperature (resulting in an increase in the operating temperature of the ion exchange resin bed) also require a comprehensive evaluation of the ion exchange resins that have been used or are planned to be used (such as purification performance and dissolution performance, etc.). Summary of the invention

[0003] In view of this, in order to overcome the defects of the prior art and achieve the above-mentioned purpose, the purpose of the present invention is to provide a nuclear power plant ion exchange resin purification simulation test device, which can quickly and accurately evaluate the purification performance of the ion exchange resin bed.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A nuclear power plant ion exchange resin purification simulation test device comprises a water supply module, a dosing module, a temperature control module, a test module, an online monitoring module, a purification module, a control module and a data acquisition module. The water supply module is used to store liquid and send the liquid into a pipeline to form a fluid. The dosing module is used to add reagents to the pipeline. The temperature control module is used to control the temperature of the liquid. The test module comprises an ion exchange resin bed for testing. The online monitoring module is used to detect various data of the fluid in the pipeline. The control module is used to connect and control the water supply pump and the dosing module. The data acquisition module is used to connect to the online monitoring module and collect test data.

[0006] According to some preferred implementation aspects of the present invention, the online monitoring module includes an inlet monitoring group and an outlet monitoring group, the detection group includes monitoring instruments, and the detection instruments in each detection group are arranged in parallel.

[0007] According to some preferred implementation aspects of the present invention, the detection instrument includes a pH meter and a conductivity meter.

[0008] According to some preferred implementation aspects of the present invention, the temperature control module includes a first temperature control element for controlling the temperature of the water tank and a second temperature control element arranged after the dosing module for controlling the temperature of the fluid in the pipeline.

[0009] According to some preferred implementation aspects of the present invention, the second temperature control element is arranged after the drug adding module.

[0010] According to some preferred implementation aspects of the present invention, a pipeline mixer is further provided on the pipeline, and the pipeline mixer is provided after the dosing module.

[0011] According to some preferred embodiments of the present invention, the dosing module is used to add water quality regulating agents, evaluation agents and control agents into the pipeline, the water quality regulating agents are agents used during normal water quality operation, the evaluation agents are chemical agents additionally added during normal operation of the test, and the control agents are other agents added when the test evaluation agents are added for evaluating the sensitivity of measuring a certain parameter.

[0012] According to some preferred implementation aspects of the present invention, the dosing module includes a dosing pump corresponding to each medicament, and the flow rate of each dosing pump is controlled at 30 mL / h.

[0013] According to some preferred embodiments of the present invention, the dosing pump is a plunger pump or a peristaltic pump.

[0014] According to some preferred embodiments of the present invention, the purification module comprises a purification resin bed for removing impurities in the pipeline fluid.

[0015] The present invention also provides a test method for dynamic simulation of ion exchange resin purification based on the above test device, comprising the following steps:

[0016] Start the temperature control module to heat the liquid and fluid to the set temperature, then start the dosing module to add the regulating agent and the control agent into the fluid, start the online monitoring module to measure the relevant parameters of the fluid at this time, and obtain the control data;

[0017] Install the test ion exchange resin bed, start the test module, start the dosing module to add the regulating agent, the evaluation agent and the control agent into the fluid, start the online monitoring module to measure the relevant parameters of the fluid at this time, and obtain the test data;

[0018] The control data were compared with the test data to evaluate the purification effect of the test ion exchange resin bed.

[0019] Compared with the prior art, the advantages of the present invention are as follows: the nuclear power plant ion exchange resin purification simulation test device of the present application can simulate the normal operation water quality of the power plant and evaluate the purification capacity of different ion exchange resins; it can also add new additives to evaluate the purification capacity of the original or new ion exchange resins; it can also change operating parameters, such as temperature, to evaluate the purification capacity and dissolution and other indicators of the original or new ion exchange resins. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of a nuclear power plant ion exchange resin purification simulation test device in a preferred embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the flow of a nuclear power plant ion exchange resin purification simulation test device in a preferred embodiment of the present invention;

[0023] In the figure, 101-127 indicate valves. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] As attached Figure 1-2 As shown, the nuclear power plant ion exchange resin purification simulation test device in this embodiment includes a water supply module, a dosing module, a temperature control module, a test module, an online monitoring module, a purification module, a control module and a data acquisition module. The following describes each module and the relationship between the modules in detail:

[0026] The water supply module is used to store liquid and send the liquid into the pipeline to form a fluid. Specifically, the water supply module in this embodiment includes a water tank for storing liquid and a water supply pump for injecting the liquid in the water tank into the pipeline to form a fluid.

[0027] The water supply pump in this embodiment is a variable frequency pump, which adopts variable frequency control, and the maximum water supply flow rate is 2L / h. The main fluid flow rate is regulated by the water supply pump and the reflux flow rate. The adjustable flow rate range is 10-70L / h. If the inner diameter of the tested ion exchange resin bed is 30mm, the empty tower flow rate is 10-100m / h.

[0028] The dosing module is used to add reagents to the pipeline. The reagents in this embodiment are divided into water quality regulating reagents, evaluation reagents and control reagents. The water quality regulating reagents are the reagents added when the water quality is operating normally, such as NH 3 , amine, etc.; evaluation agents are chemical agents added during normal operation of the test, such as film-forming amines, ETA, etc.; control agents are other agents added when the test evaluation agents are added to evaluate the measurement sensitivity of a certain parameter, such as Na, etc.

[0029] The dosing module is used to add reagents into the pipeline. The dosing module includes a dosing pump corresponding to each reagent. The flow rate of each dosing pump is controlled at 30mL / h to reduce the fluctuation of the total fluid volume in the system during dosing, and the dosing pump flow rate can be automatically adjusted according to the back-end water parameters. The dosing pump is a plunger pump or a peristaltic pump to achieve stable and accurate dosing.

[0030] The temperature control module is used to control the temperature of the liquid. In this embodiment, it includes a first temperature control element for controlling the temperature of the water tank and a second temperature control element arranged after the dosing module for controlling the temperature of the fluid in the pipeline. The first temperature control element can preliminarily heat the liquid in the water tank to 30-60°C to roughly control the water temperature at the normal operating temperature or the required temperature. For example, under the condition of a flow rate of 2L / h, the water temperature can be increased by 60°C and can be operated at a constant temperature. The second temperature control element is arranged after the dosing module, and a stainless steel heating or cooling coil is placed in a temperature-controlled constant temperature water tank, which is used to accurately control the temperature of the fluid mixed with the agent to the temperature during normal operation on site or the required temperature, with a temperature control accuracy of ±0.2°C.

[0031] The water tank in this embodiment has interfaces such as water replenishment, exhaust, water pump reflux, main fluid return, water inlet and sewage discharge to achieve the perfection and completeness of various functions. The liquid in the water tank and the replenishment water are desalted water. The water supply is heated by the built-in heating element to control the water temperature roughly at the normal operating temperature or the required temperature: 30-60°C. After the water tank is replenished to 50-70% capacity, the water supply pump is started, and the fluid enters the dosing module. The water delivered by the water supply pump can be adjusted by reflux or by the frequency conversion of the water supply pump itself.

[0032] The test module includes a test ion exchange resin bed, the test resin bed adopts a quick connection design, and the resin bed body adopts a low dissolution material such as stainless steel, PP, PFA, etc. Specifically, the test ion exchange resin bed in this embodiment adopts a soft PFA tube sleeve connection to facilitate the disassembly and assembly of the test ion exchange resin. The inner diameter of the test ion exchange resin bed is not less than 30mm, and the filling height is not less than 700mm.

[0033] The online monitoring module is used to detect various data of the fluid in the pipeline. The online testing module can adopt manual sampling and analysis for water inlet, or manual sampling and analysis for both water inlet and water outlet. Specifically, the online monitoring module includes an inlet monitoring group for online detection of inlet water quality and an outlet detection group for online detection of outlet water quality. Each detection group includes a monitoring instrument, and each detection instrument in each detection group is arranged in parallel. The detection instrument in this embodiment includes a pH meter and a positive conductivity meter to monitor the leakage or penetration point of the ion exchange test column during the test. In other embodiments, in order to achieve the purpose of the actual test, online water chemical instruments such as sodium meters of other parameters can be combined. The instruments are designed in parallel so that the online detection of each instrument does not interfere with each other, and the flow of each online instrument is fed back by the display of its own flow meter and manually adjusted by its inlet regulating valve.

[0034] The control module is used to connect with the water supply pump and the dosing module respectively and control their respective working states, specifically to control the start and stop of the water supply pump and the dosing pump of the dosing module and to adjust the flow rate of the water supply pump.

[0035] The data acquisition module is used to connect with the instruments in the online monitoring module and collect continuous test data.

[0036] The purification module includes a purification resin bed, which is used to remove impurities in the pipeline fluid. The fluid of the tested water after passing through the purification resin bed can be returned to the water tank for recycling, which can reduce water replenishment and drainage. The purification resin bed can use ordinary commercially available ion exchange resin with purification function. The purification resin bed uses a large-capacity stainless steel resin bed to reduce dissolution. The purification resin bed adopts a quick connection design or a threaded connection to facilitate quick replacement of the resin. The purification ion exchange resin bed is preferably set between 20-50L.

[0037] A pipeline mixer is also provided on the pipeline, and the pipeline mixer is provided after the dosing module to mix the medicine and the fluid evenly. The dosing flow rate can be automatically adjusted according to the conductivity or pH of the water outlet from the pipeline mixer.

[0038] The above modules are connected by pipes. The main circuit pipeline is 3 / 8 stainless steel pipe, which adopts the ferrule connection method. The interfaces of the water pump and temperature control module are standard internal thread interfaces.

[0039] The pipes and pipe fittings in the nuclear power plant ion exchange resin purification simulation test device in this embodiment can also be made of non-eluting materials such as PP and PFA. The valves can be made of non-eluting materials such as stainless steel, PP and PFA, with the same specifications as the pipes and pipe fittings.

[0040] The following briefly describes the working process of the nuclear power plant ion exchange resin purification simulation test device in this embodiment:

[0041] like Figure 1 and Figure 2 As shown, the liquid in the water tank, such as water, is first heated to a set temperature such as 60°C by the first temperature control element, and then injected into the pipeline through the water supply pump to form a fluid. After the fluid is added with medicine by the dosing module and the temperature is controlled by the second temperature control element, it enters the test ion exchange resin bed. The inlet water monitoring group in the online monitoring module monitors the relevant indicators of the inlet water that has not entered the test ion exchange resin bed, and the outlet water detection group monitors the relevant indicators of the outlet water after being treated by the test ion exchange resin bed. The outlet water is purified by the purification ion resin exchange bed and returned to the water tank for recycling.

[0042] See also Figure 1 When the simulation test is performed using the nuclear power plant ion exchange resin purification simulation test device in this embodiment, the following steps are specifically included:

[0043] 1) System cleaning

[0044] Check that all valves in the system are in the closed state. Open valves 102 and 101 in sequence to add water; when the water is added to 20% of the water tank capacity, close valve 101, open valve 103 to drain; close valve 103. Open valve 101, add water to 50-70%, and close valve 101.

[0045] Turn on the water supply tank for heating. After reaching the predetermined temperature, open valves 104, 105 and 106 to start the water supply pump; open valves 114, 116, 117 and 118, and close valve 106. The system can be further cleaned, and impurities are removed by the resin purification bed. In addition, the cleaning liquid of the resin purification bed is directly discharged through valve 118. In this embodiment, the cleaning water of the resin purification bed is required to be no less than 1.5 times the volume of the resin bed, and it is noted that the water level of the water tank is not less than 30% operation. After the resin purification column is cleaned, open valve 119 and close valve 118, and the main fluid returns to the water supply tank; open valves 111, 112 and 113, close valve 114, and establish a full system cycle. The cleaning of the instrument channel can be completed by opening the drain valve and water inlet valve of each instrument for 5 minutes, and then closing the water inlet valve and drain valve of the instrument. During the cleaning process, pay attention to the water tank level and keep it running at 30-70%. At the same time, ensure that there are no bubbles or air segments in the pipeline.

[0046] Figure 1For a clearer display, the valve number is not connected to the corresponding valve with a marking line. The valve number is written directly near the corresponding valve.

[0047] 2) Temperature regulation

[0048] Before starting the system cleaning, the first temperature control element can be turned on to heat the water tank to make the system fluid temperature reach the required temperature. During operation, the second temperature control element can be turned on to accurately control the temperature.

[0049] 3) Instrument flow regulation

[0050] Adjust the water inlet flow of each instrument separately to ensure that the water inlet flow of the instrument meets the instrument test requirements or is consistent with the test object power plant.

[0051] 4) Test evaluation

[0052] Check that the entire device system has no water or air leakage, the water tank level is between 30-70%, and there are no bubbles or air segments in the fluid pipeline. Check whether the instrument display, record, and flow are normal. Check whether the dosing pump is normal and whether the added agent is configured. Set the dosing pump flow rate according to the calculated dosing amount, and the dosing pump flow rate should be less than 30mL / h. Start the regulating agent and control agent dosing pumps, open the corresponding valves, adjust the dosing amount according to the test requirements until it meets the requirements and runs stably, and conduct tests and data recording according to the plan to obtain control data. When the control test is completed, replace the resin in the test ion exchange resin bed, start the regulating agent, control agent dosing pumps and evaluation agent dosing pumps, open the corresponding valves, conduct tests and data recording according to the plan to obtain test data. During the test, samples can be taken from the corresponding sampling port for offline analysis to support the online instrument data. Compare the control data with the test data to evaluate the purification effect of the test ion exchange resin bed.

[0053] The main fluid enters the temperature control module after being added with medicine. The temperature of the main fluid is precisely adjusted by the temperature control module after being preliminarily heated by the water tank. The temperature control coil is placed in a temperature-controlled constant temperature water tank with a temperature control accuracy of ±0.2℃.

[0054] For ease of understanding and explanation, the above steps are numbered and segmented. In actual tests, the above steps can be performed simultaneously in no particular order.

[0055] The nuclear power plant ion exchange resin purification simulation test device disclosed in the present invention includes functions such as water supply, dosing, temperature control, testing, online monitoring, control and data acquisition. The test device can simulate the normal operation water quality of the power plant to evaluate the purification capacity of different ion exchange resins; it can also add new dosing to evaluate the purification capacity of the original or new ion exchange resin; it can also change the operating parameters, such as temperature, to evaluate the purification capacity and dissolution index of the original or new ion exchange resin.

[0056] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A nuclear power plant ion exchange resin purification simulation test device, characterized in that: It includes a water supply module, a dosing module, a temperature control module, a test module, an online monitoring module, a purification module, a control module and a data acquisition module. The water supply module is used to store liquid and send the liquid into a pipeline to form a fluid. The dosing module is used to add medicine to the pipeline. The temperature control module is used to control the temperature of the liquid. The test module includes an ion exchange resin bed for testing. The online monitoring module is used to detect various data of the fluid in the pipeline. The control module is used to connect and control the water supply pump and the dosing module. The data acquisition module is used to connect with the online monitoring module and collect test data. The online monitoring module includes an inlet monitoring group and an outlet detection group, the detection group includes monitoring instruments, and each detection instrument in the detection group is arranged in parallel; the detection instrument includes a pH meter and a conductivity meter; a pipeline mixer is also arranged on the pipeline, and the pipeline mixer is arranged after the dosing module; the dosing module includes a dosing pump corresponding to each drug; the dosing pump automatically adjusts the dosing flow rate according to the conductivity or pH of the outlet water of the pipeline mixer; The temperature control module includes a first temperature control element for controlling the temperature of the water tank and a second temperature control element disposed behind the dosing module for controlling the temperature of the fluid in the pipeline; The dosing module is used to add water quality regulating agents, evaluation agents and control agents into the pipeline. The water quality regulating agents are agents used when the water quality is operating normally, the evaluation agents are chemical agents added during the normal operation of the test, and the control agents are other agents added when the test evaluation agents are added to evaluate the sensitivity of measuring a certain parameter.

2. The test device according to claim 1, characterized in that: The second temperature control element is arranged behind the drug adding module.

3. The test device according to claim 1, characterized in that: The flow rate of each dosing pump is controlled at 30 mL / h.

4. The test device according to claim 3, characterized in that: The purification module includes a purification resin bed for removing impurities from pipeline fluid.

5. A test method for simulating ion exchange resin purification in a nuclear power plant according to the test device according to any one of claims 1 to 4, characterized in that: The steps include: Start the temperature control module to heat the liquid and fluid to the set temperature, then start the dosing module to add the regulating agent and the control agent into the fluid, start the online monitoring module to measure the relevant parameters of the fluid at this time, and obtain the control data; Install the test ion exchange resin bed, start the test module, start the dosing module to add the regulating agent, the evaluation agent and the control agent into the fluid, start the online monitoring module to measure the relevant parameters of the fluid at this time, and obtain the test data; The control data were compared with the test data to evaluate the purification effect of the test ion exchange resin bed.

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