System and method for detecting corrosion rate of fire-fighting water pipeline of nuclear power plant

Abstract

The invention belongs to the technical field of nuclear power, and particularly relates to a nuclear power plant fire-fighting water pipeline corrosion rate detection system and method. The system disclosed by the invention can simulate fire-fighting water pipelines in different closed states and different flowing state environments, and is wide in application range; the main materials of the system can be matched with the main materials of the nuclear power plant, and the used medium is consistent with the water source used by the nuclear power plant, so that the simulated environment is real and reliable, and the effectiveness and credibility of the corrosion detection result are ensured; the system is equipped with a high-precision oxygen meter, a pH meter, a conductivity meter and a deoxidizing device, so that the initial concentration, pH, conductivity and other corrosion influence key index levels of the oxygen content in a medium can be effectively controlled; the system is provided with a pump and a flowmeter, and the system pipeline flow can be accurately controlled; the system is provided with a dosing device, so that the fire-fighting water pipeline medium condition in a special environment can be simulated; the system is provided with a resistance probe corrosion on-line monitoring device and an ultrasonic phased array, so that the corrosion change condition of the pipeline can be mastered in real time.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power, and in particular relates to a system and method for detecting corrosion rate of fire water pipelines in a nuclear power plant. Background Art

[0002] The fire water system pipeline is an important safety system in nuclear power plants. The pipelines are mainly drinking water or other water, and the pipeline materials are carbon steel and some are stainless steel. During the use of the system, under the combined effects of microorganisms, oxygen and water flow rate, the fire water system pipeline is at risk of corrosion and perforation. Since the fire water pipeline is filled with water all year round, the main detection method in related technologies is external visual inspection. Some pipelines use ultrasonic thickness measurement and guided wave, but it is impossible to accurately know the changes in the corrosion rate of the pipeline, and the detection frequency is too high, which will increase the economic cost. Summary of the invention

[0003] In order to overcome the problems existing in the related technologies, a nuclear power plant fire water pipeline corrosion rate detection system and method are provided.

[0004] According to one aspect of an embodiment of the present disclosure, a nuclear power plant fire water pipeline corrosion rate detection system is provided, in which a main pipeline is connected to a reaction vessel, a pump, a resistance probe corrosion online monitoring device, an ultrasonic phased array detection device, and a flow meter to form a system loop;

[0005] The reaction vessel is used to contain the fire water pipeline medium; the exhaust pipe is used to deoxygenate and exhaust the reaction vessel; the pH meter is used to monitor the pH value of the medium in the reaction vessel in real time; the conductivity meter is used to monitor the conductivity of the medium in the reaction vessel in real time; the pump is used to provide the flow of the entire system; the computer is used to receive data collected by the resistance probe corrosion online monitoring device and the ultrasonic phased array detection device; the resistance probe corrosion online monitoring device is used to collect the corrosion rate inside the main pipeline; the ultrasonic phased array detection device is used to collect the inner wall thickness of the main pipeline; the flow meter has a range of ~L / s and is used to display the system flow and regulate the system flow; the online oxygen meter is used to monitor the oxygen content in the reaction vessel in real time; the sampling tube is used to take samples from the reaction vessel and drain the system; the air inlet pipe is used for deoxygenation or oxygenation of the system; the dosing box is connected to the reaction vessel through the dosing pipe and is used to add drugs to the reaction vessel; the liquid level meter is used to monitor the liquid level in the reaction vessel in real time, thereby facilitating personnel to control the water capacity of the entire system.

[0006] In a possible implementation, the main pipeline in the system can also be detachably connected to a straight pipe section test piece, a three-way section test piece, an elbow test piece and a flow meter;

[0007] Straight pipe section test pieces, tee section test pieces and elbow test pieces can all be removed from the main pipeline for failure analysis.

[0008] In a possible implementation, the system adds solution to the reaction container through the dosing box while performing system simulation until the values ​​of the pH meter and the conductivity meter meet the test requirements, closes the valve on the dosing pipe, uses an ultrasonic phased array detection device to detect the wall thickness of the test piece pipe, and records the test results;

[0009] Open all valves on the main loop pipeline of the system and start the pump to drive the loop to flow; open the valve of the air inlet pipeline and the valve of the exhaust pipeline, and then introduce nitrogen through the air inlet pipeline to deoxygenate the reaction container until the oxygen concentration value in the reaction container collected by the online oxygen meter reaches the preset oxygen content concentration threshold required for the test, then stop introducing nitrogen and close the valve of the air inlet pipeline and the valve of the exhaust pipeline;

[0010] Turn off the pump, and during the test, control the pump operation according to the test requirements, and obtain data collected by the resistance probe corrosion online monitoring device and the ultrasonic phased array detection device at a preset frequency;

[0011] After the test, the trend of pipeline corrosion rate over time was determined based on the monitoring data of the resistance probe corrosion online monitoring device obtained during the test. The trend of pipeline thickness over time was determined based on the monitoring data of the ultrasonic phased array detection device obtained during the test, and the pipeline life prediction results were further given.

[0012] In a possible implementation, after the test, samples are taken through a sampling tube, and the iron ion concentration in the water is analyzed to obtain the corrosion status of the entire system.

[0013] In one possible implementation, the system can simulate any of a static sealed system, a periodic circulation system, and a full flow circulation system;

[0014] The test requirement for the system to simulate a static sealing system is to shut down the pump during the test;

[0015] The test requirements for the system simulation periodic circulation system are to start the pump at a preset time period and at a preset flow rate during the test, and to add water to the system through the dosing box or the air intake pipe according to the test requirements;

[0016] The test requirement for the system to simulate a full-flow circulation system is to operate the pump at a preset flow control during the test, and to add water to the system through the dosing box or the air intake pipe according to the test requirements.

[0017] According to another aspect of the present disclosure, a method for detecting corrosion rate of fire water pipelines in a nuclear power plant is provided, the method comprising:

[0018] When the system is simulating the system, the solution is added to the reaction container through the dosing box until the values ​​of the pH meter and the conductivity meter meet the test requirements. Then, the valve on the dosing pipe is closed, and the ultrasonic phased array detection device is used to detect the wall thickness of the test piece pipe, and the test results are recorded.

[0019] Open all valves on the main loop pipeline of the system and start the pump to drive the loop to flow; open the valve of the air inlet pipeline and the valve of the exhaust pipeline, and then introduce nitrogen through the air inlet pipeline to deoxygenate the reaction container until the oxygen concentration value in the reaction container collected by the online oxygen meter reaches the preset oxygen content concentration threshold required for the test, then stop introducing nitrogen and close the valve of the air inlet pipeline and the valve of the exhaust pipeline;

[0020] Turn off the pump, and during the test, control the pump operation according to the test requirements, and obtain data collected by the resistance probe corrosion online monitoring device and the ultrasonic phased array detection device at a preset frequency;

[0021] After the test, the trend of pipeline corrosion rate over time was determined based on the monitoring data of the resistance probe corrosion online monitoring device obtained during the test. The trend of pipeline thickness over time was determined based on the monitoring data of the ultrasonic phased array detection device obtained during the test, and the pipeline life prediction results were further given.

[0022] In a possible implementation, the method further includes: after the test is completed, sampling is performed through a sampling tube, and the iron ion concentration in the water is analyzed to obtain the corrosion condition of the entire system.

[0023] In one possible implementation, the system can simulate any of a static sealed system, a periodic circulation system, and a full flow circulation system;

[0024] The test requirement for the system to simulate a static sealing system is to shut down the pump during the test;

[0025] The test requirements for the system simulation periodic circulation system are to start the pump at a preset time period and at a preset flow rate during the test, and to add water to the system through the dosing box or the air intake pipe according to the test requirements;

[0026] The test requirement for the system to simulate a full-flow circulation system is to operate the pump at a preset flow control during the test, and to add water to the system through the dosing box or the air intake pipe according to the test requirements.

[0027] The beneficial effects of the present disclosure are as follows: the system of the present disclosure can simulate fire water pipes in different closed states and different flow state environments, and has a wide range of applications; the main materials of the system can match the main materials of nuclear power plants, and the medium used is consistent with the water source used by nuclear power plants. Therefore, the simulated environment is real and reliable, ensuring the validity and credibility of the corrosion detection results; the system is equipped with a high-precision oxygen meter, pH meter, conductivity meter and deoxygenation device, which can effectively control the initial concentration of oxygen content in the medium, pH, conductivity and other key corrosion-influencing index levels; the system is equipped with a pump and a flow meter, which can accurately control the system pipeline flow; the system is equipped with a dosing device, which can simulate the fire water pipeline medium conditions under special environments; the system is designed with a resistance probe corrosion online monitoring device and an ultrasonic phased array, which can grasp the changes in pipeline corrosion in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The diagram is a schematic diagram of a nuclear power plant fire water pipeline corrosion rate detection system according to an exemplary embodiment.

[0029] In the figure:

[0030] 1. Reaction vessel; 2. Exhaust pipe; 3. pH meter; 4. Conductivity meter; 5. Pump; 6. Computer;

[0031] 7. Resistance probe corrosion online monitoring device; 8. Ultrasonic phased array detection device;

[0032] 9. Straight pipe section test piece; 10. Tee section test piece; 11. Elbow test piece; 12. Flow meter;

[0033] 13. Main pipeline; 14. Online oxygen meter; 15. Sampling tube; 16. Air intake pipeline; 17. Dosing box;

[0034] 18. Drug inlet pipe; 19. Liquid level meter. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Figure 1 FIG. 1 is a schematic diagram of a nuclear power plant fire water pipeline corrosion rate detection system according to an exemplary embodiment. Figure 1 As shown, the main pipeline 13 in the system is respectively connected to the reaction container 1, the pump 5, the resistance probe corrosion online monitoring device 7, the ultrasonic phased array detection device 8, the straight pipe section test piece 9, the three-way section test piece 10, the elbow test piece 11 and the flow meter 12 to form a system loop.

[0037] The material of the main pipeline 13 is A106Gr.B, with a specification of Φ60*3mm; the reaction vessel 1 (with a diameter of 1200mm, a height of 1600mm, and a material of A106Gr.B) is used to contain the fire water pipeline medium; the exhaust pipe 2 (with a specification of Φ10*2mm, and a material of A106Gr.B) is used to deoxygenate and exhaust the reaction vessel 1; the pH meter 3 is used to monitor the pH value of the medium in the reaction vessel 1 in real time; the conductivity meter 4 is used to monitor the conductivity of the medium in the reaction vessel 1 in real time; the pump 5 (made of stainless steel, with a maximum flow rate of 12L / s) is used to provide the flow rate of the entire system; the computer 6 is used to receive data collected by the online corrosion monitoring device 7 of the resistance probe corrosion and the ultrasonic phased array detection device 8; the online corrosion monitoring device 7 of the resistance probe corrosion is used to collect the internal corrosion rate of the main pipeline 13; the ultrasonic phased array detection device 8 is used to collect the inner wall thickness of the main pipeline 13; the straight pipe section test piece 9, the three-way section test piece 10 and the elbow test piece 11 can all be from the main pipeline 1 3 is disassembled for failure analysis when necessary; the flow meter 12 has a range of 0-12 L / s, which is used to display the system flow and regulate the system flow; the online oxygen meter 14 (the range can include 0-20 μg / L, 0-200 μg / L, 0-20 mg / L) is used to monitor the oxygen content in the reaction container 1 in real time to grasp the oxygen content of the medium; the sampling tube 15 (specification Φ10*2mm, material A106Gr.B) is used to take samples from the reaction container 1 and drain the system; The gas pipeline 16 (specification: Φ10*2mm, material: A106Gr.B) is used for deoxygenation or oxygenation of the system; the drug adding box 17 (specification: 100*80*80mm, material: A106Gr.B) is connected to the reaction container 1 through the drug inlet pipe 18 (specification: Φ20*2mm, material: A106Gr.B) for adding drugs to the reaction container 1; the liquid level meter 19 is used for real-time monitoring of the liquid level in the reaction container 1, thereby facilitating personnel to control the water capacity of the entire system.

[0038] The system of the present disclosure is capable of simulating static seal, periodic cycle, and full flow cycle systems.

[0039] In a possible implementation, the system simulates a static sealing system, and adds a solution to the reaction container 1 through the dosing box 17 until the values ​​of the pH meter 3 and the conductivity meter 4 meet the test requirements, and then closes the valve on the dosing pipe 18, uses the ultrasonic phased array detection device 8 to detect the wall thickness of the test piece pipe, and records the test results;

[0040] Open all valves on the main loop pipeline of the system and start pump 5. The flow rate of pump 5 can be controlled at 6L / s to drive the loop to flow; open the valve of the air intake pipeline 16 and the valve of the exhaust pipeline 2, and then introduce nitrogen through the air intake pipeline 16 to deoxygenate the reaction container 1 until the online oxygen meter detects that the oxygen concentration in the reaction container 1 shows a value that is the preset oxygen content concentration threshold required for the test, then stop introducing nitrogen, and close the valve of the air intake pipeline 16 and the valve of the exhaust pipeline 2.

[0041] The pump 5 is turned off. During the test, data collected by the resistance probe corrosion online monitoring device 7 and the ultrasonic phased array detection device 8 are obtained at a preset frequency.

[0042] After the test, the trend of the pipeline corrosion rate over time is determined based on the monitoring data of the resistance probe corrosion online monitoring device 7 obtained during the test, and the trend of the pipeline thickness over time is determined based on the monitoring data of the ultrasonic phased array detection device 8 obtained during the test, and the pipeline life prediction result can be further given. In a possible implementation, sampling can also be performed through a sampling tube to analyze the iron ion concentration in the water, analyze the corrosion of the entire system, and provide reference data for the final result.

[0043] In a possible implementation, the system simulates a periodic circulation system, and adds a solution to the reaction container 1 through the dosing box 17 until the values ​​of the pH meter 3 and the conductivity meter 4 meet the test requirements, and then closes the valve on the dosing pipe 18, uses the ultrasonic phased array detection device 8 to detect the wall thickness of the test piece pipe, and records the test results;

[0044] Open all valves on the main loop pipeline and start the pump with the flow rate of the pump controlled at 6L / s to drive the loop to flow; open the valve of the air intake pipeline 16 and the valve of the exhaust pipeline 2, and then introduce nitrogen through the air intake pipeline 16 to deoxygenate the reaction vessel 1 until the online oxygen meter detects that the oxygen concentration in the reaction vessel 1 shows a value that is the preset oxygen content concentration threshold required for the test, then stop introducing nitrogen and close the valve of the air intake pipeline 16 and the valve of the exhaust pipeline 2.

[0045] After the pump 5 is turned off, the pump 5 is started at a preset time period and a preset flow rate according to the test plan, and the pump is turned off after running for a corresponding time. At the same time, water can be added to the system through the dosing box 17 or the air intake pipe 16 according to the test plan. During the test, the data collected by the resistance probe corrosion online monitoring device 7 and the ultrasonic phased array detection device 8 are obtained at a preset frequency.

[0046] After the test, the trend of the pipeline corrosion rate over time is determined based on the monitoring data of the resistance probe corrosion online monitoring device 7 obtained during the test, and the trend of the pipeline thickness over time is determined based on the monitoring data of the ultrasonic phased array detection device 8 obtained during the test, and the pipeline life prediction result can be further given. In a possible implementation, sampling can also be performed through a sampling tube to analyze the iron ion concentration in the water, analyze the corrosion of the entire system, and provide reference data for the final result.

[0047] When the system simulates a static sealing system, the solution is added to the reaction container 1 through the dosing box 17 until the values ​​of the pH meter 3 and the conductivity meter 4 meet the test requirements, and then the valve on the dosing pipe 18 is closed, and the ultrasonic phased array detection device 8 is used to detect the wall thickness of the test piece pipe, and the detection results are recorded;

[0048] Open all valves on the main loop pipeline and start pump 5. The flow rate of pump 5 is controlled at 6L / s to drive the loop to flow; open the valve of the air intake pipeline 16 and the valve of the exhaust pipeline 2, and then introduce nitrogen through the air intake pipeline 16 to deoxygenate the reaction container 1 until the online oxygen meter detects that the oxygen concentration in the reaction container 1 shows a value that is the preset oxygen content concentration threshold required for the test, then stop introducing nitrogen, and close the valve of the air intake pipeline 16 and the valve of the exhaust pipeline 2.

[0049] The flow rate of the pump 5 is adjusted to make the flow rate of the pump 5 consistent with the flow rate required by the test; during the test, water can be added to the system through the dosing box or the air intake pipe 16 according to the test requirements. The data collected by the resistance probe corrosion online monitoring device 7 and the ultrasonic phased array detection device 8 are obtained at a preset frequency.

[0050] After the test, the trend of the pipeline corrosion rate over time is determined based on the monitoring data of the resistance probe corrosion online monitoring device 7 obtained during the test, and the trend of the pipeline thickness over time is determined based on the monitoring data of the ultrasonic phased array detection device 8 obtained during the test, and the pipeline life prediction result can be further given. In a possible implementation, sampling can also be performed through a sampling tube to analyze the iron ion concentration in the water, analyze the corrosion of the entire system, and provide reference data for the final result.

[0051] The system is designed with straight pipes, tees and elbow test pieces to facilitate the assessment and acquisition of typical pipe corrosion changes.

[0052] The disclosed system is based on the principle of metal corrosion, matrix thinning and resistance change. It takes the important pipe sections of the nuclear power plant fire water system as the simulation object, and can simulate the corrosion changes of the fire water pipes at different times. It is supplemented by ultrasonic phased array detection technology and resistance probe online monitoring technology to grasp the corrosion changes of the fire water pipes in real time. This system can simulate closed static fire water pipes, as well as fire water pipes that are regularly replenished with new water and fully flowing. In addition, this system can also simulate the changes in the corrosion rate of carbon steel in the case of coating damage in seawater environment. It is convenient for nuclear power plant managers to check its changing status at any time to formulate corresponding measures to meet the requirements of safe operation and management of nuclear power plants.

[0053] According to another aspect of the present disclosure, a method for detecting corrosion rate of fire water pipelines in a nuclear power plant is provided, the method comprising:

[0054] When the system is simulating the system, the solution is added to the reaction container through the dosing box until the values ​​of the pH meter and the conductivity meter meet the test requirements. Then, the valve on the dosing pipe is closed, and the ultrasonic phased array detection device is used to detect the wall thickness of the test piece pipe, and the test results are recorded.

[0055] Open all valves on the main loop pipeline of the system and start the pump to drive the loop to flow; open the valve of the air inlet pipeline and the valve of the exhaust pipeline, and then introduce nitrogen through the air inlet pipeline to deoxygenate the reaction container until the oxygen concentration value in the reaction container collected by the online oxygen meter reaches the preset oxygen content concentration threshold required for the test, then stop introducing nitrogen and close the valve of the air inlet pipeline and the valve of the exhaust pipeline;

[0056] Turn off the pump, and during the test, control the pump operation according to the test requirements, and obtain data collected by the resistance probe corrosion online monitoring device and the ultrasonic phased array detection device at a preset frequency;

[0057] After the test, the trend of pipeline corrosion rate over time was determined based on the monitoring data of the resistance probe corrosion online monitoring device obtained during the test. The trend of pipeline thickness over time was determined based on the monitoring data of the ultrasonic phased array detection device obtained during the test, and the pipeline life prediction results were further given.

[0058] In a possible implementation, the method further includes: after the test is completed, sampling is performed through a sampling tube, and the iron ion concentration in the water is analyzed to obtain the corrosion status of the entire system.

[0059] In one possible implementation, the system can simulate any of a static sealed system, a periodic circulation system, and a full flow circulation system;

[0060] The test requirement for the system to simulate a static sealing system is to shut down the pump during the test;

[0061] The test requirements for the system simulation periodic circulation system are to start the pump at a preset time period and at a preset flow rate during the test, and to add water to the system through the dosing box or the air intake pipe according to the test requirements;

[0062] The test requirement for the system to simulate a full-flow circulation system is to operate the pump at a preset flow control during the test, and to add water to the system through the dosing box or the air intake pipe according to the test requirements.

[0063] For the description of the above method, please refer to the above description of the system, which will not be repeated here.

[0064] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A nuclear power plant fire water pipeline corrosion rate detection system, characterized in that: The main pipeline in the system is respectively connected to the reaction container, the pump, the resistance probe corrosion online monitoring device, the ultrasonic phased array detection device, and the flow meter to form a system loop; The reaction vessel is used to hold the fire water pipeline medium; the exhaust pipe is used to deoxygenate and exhaust the reaction vessel; the pH meter is used to monitor the pH value of the medium in the reaction vessel in real time; the conductivity meter is used to monitor the conductivity of the medium in the reaction vessel in real time; the pump is used to provide the flow of the entire system; The computer is used to receive data collected by the resistance probe corrosion online monitoring device and the ultrasonic phased array detection device; the resistance probe corrosion online monitoring device is used to collect the corrosion rate inside the main pipeline; the ultrasonic phased array detection device is used to collect the inner wall thickness of the main pipeline; the flow meter has a range of ~L / s and is used to display the system flow and regulate the system flow; the online oxygen meter is used to monitor the oxygen content in the reaction vessel in real time; the sampling tube is used to take samples from the reaction vessel and drain the system; the air inlet pipe is used for deoxygenation or oxygenation of the system; the dosing box is connected to the reaction vessel through the dosing pipe and is used to add drugs to the reaction vessel; the liquid level meter is used to monitor the liquid level in the reaction vessel in real time.

2. The system according to claim 1, characterized in that The main pipeline in the system can also be detachably connected to a straight pipe section test piece, a three-way section test piece, an elbow test piece and a flow meter; Straight pipe section test pieces, tee section test pieces and elbow test pieces can all be removed from the main pipeline for failure analysis.

3. The system according to claim 1, characterized in that When the system is simulating the system, the solution is added to the reaction container through the dosing box until the values ​​of the pH meter and the conductivity meter meet the test requirements. Then, the valve on the dosing pipe is closed, and the ultrasonic phased array detection device is used to detect the wall thickness of the test piece pipe, and the test results are recorded. Open all valves on the main loop pipeline of the system and start the pump to drive the loop to flow; open the valve of the air inlet pipeline and the valve of the exhaust pipeline, and then introduce nitrogen through the air inlet pipeline to deoxygenate the reaction container until the oxygen concentration value in the reaction container collected by the online oxygen meter reaches the preset oxygen content concentration threshold required for the test, then stop introducing nitrogen and close the valve of the air inlet pipeline and the valve of the exhaust pipeline; Turn off the pump, and during the test, control the pump operation according to the test requirements, and obtain data collected by the resistance probe corrosion online monitoring device and the ultrasonic phased array detection device at a preset frequency; After the test, the trend of pipeline corrosion rate over time was determined based on the monitoring data of the resistance probe corrosion online monitoring device obtained during the test. The trend of pipeline thickness over time was determined based on the monitoring data of the ultrasonic phased array detection device obtained during the test, and the pipeline life prediction results were further given.

4. The system according to claim 3, characterized in that After the test, samples were taken through the sampling tube, and the iron ion concentration in the water was analyzed to obtain the corrosion status of the entire system.

5. The system according to claim 3, characterized in that The system can simulate any of the static sealing system, periodic circulation system and full flow circulation system; The test requirement for the system to simulate a static sealing system is to shut down the pump during the test; The test requirements for the system simulation periodic circulation system are to start the pump at a preset time period and at a preset flow rate during the test, and to add water to the system through the dosing box or the air intake pipe according to the test requirements; The test requirement for the system to simulate a full-flow circulation system is to operate the pump at a preset flow control during the test, and to add water to the system through the dosing box or the air intake pipe according to the test requirements.

6. A method for detecting the corrosion rate of fire water pipes in a nuclear power plant, characterized in that: The method comprises: When the system is simulating the system, the solution is added to the reaction container through the dosing box until the values ​​of the pH meter and the conductivity meter meet the test requirements. Then, the valve on the dosing pipe is closed, and the ultrasonic phased array detection device is used to detect the wall thickness of the test piece pipe, and the test results are recorded. Open all valves on the main loop pipeline of the system and start the pump to drive the loop to flow; open the valve of the air inlet pipeline and the valve of the exhaust pipeline, and then introduce nitrogen through the air inlet pipeline to deoxygenate the reaction container until the oxygen concentration value in the reaction container collected by the online oxygen meter reaches the preset oxygen content concentration threshold required for the test, then stop introducing nitrogen and close the valve of the air inlet pipeline and the valve of the exhaust pipeline; Turn off the pump, and during the test, control the pump operation according to the test requirements, and obtain data collected by the resistance probe corrosion online monitoring device and the ultrasonic phased array detection device at a preset frequency; After the test, the trend of pipeline corrosion rate over time was determined based on the monitoring data of the resistance probe corrosion online monitoring device obtained during the test. The trend of pipeline thickness over time was determined based on the monitoring data of the ultrasonic phased array detection device obtained during the test, and the pipeline life prediction results were further given.

7. The method according to claim 6, characterized in that The method further comprises: after the test is finished, sampling is performed through a sampling tube, and the iron ion concentration in the water is analyzed to obtain the corrosion condition of the entire system.

8. The system according to claim 6, characterized in that The system can simulate any of the static sealing system, periodic circulation system and full flow circulation system; The test requirement for the system to simulate a static sealing system is to shut down the pump during the test; The test requirements for the system simulation periodic circulation system are to start the pump at a preset time period and at a preset flow rate during the test, and to add water to the system through the dosing box or the air intake pipe according to the test requirements; The test requirement for the system to simulate a full-flow circulation system is to operate the pump at a preset flow control during the test, and to add water to the system through the dosing box or the air intake pipe according to the test requirements.

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