Device and method for evaluating corrosion performance of seawater pumped storage multi-operation-condition material

Abstract

The invention discloses a seawater pumped storage multi-operation condition material corrosion performance evaluation device and a seawater pumped storage multi-operation condition material corrosion performance evaluation method, the seawater pumped storage multi-operation condition material corrosion performance evaluation device comprises a corrosion test cavity, a temperature control system and a flow rate control system, the corrosion test cavity cooperates with the temperature control system and the flow rate control system, and the corrosion test cavity comprises a test cavity cylinder and a drawable internal member; the temperature control system comprises a heater, a temperature sensor and a temperature controller and is used for closed-loop regulation and control of the seawater temperature to a set value; the flow rate control system comprises a simulated seawater pool which is provided with an oxygenation interface, a pH meter and a temperature controller; according to the invention, the temperature closed-loop control system and the bidirectional flow speed control system are creatively integrated, and under the synergistic effect, core working condition parameters such as pipeline high pressure, bidirectional water flow switching, temperature fluctuation and the like of the seawater pumped storage power station can be dynamically reproduced; the device can simulate the influence of a pipeline material in a seawater pumped storage power station on material corrosion under the simulated seawater operation condition and evaluate the performance.

Description

Technical Field

[0001] The present invention relates to the technical field of material corrosion, and in particular to a device and method for evaluating the corrosion performance of materials under multiple operating conditions of seawater pumping and storage. Background Art

[0002] The operating conditions of seawater pumped storage power station pipeline systems are extremely complex, making it difficult to comprehensively and accurately evaluate the coating performance using traditional testing methods. Currently, domestic and international evaluations of anti-corrosion coating performance primarily rely on a series of laboratory corrosion tests, including liquid immersion corrosion tests, neutral salt spray tests, and copper salt-accelerated acetate spray tests. Coupon tests are also widely used.

[0003] However, existing coating performance evaluation simulation devices are unable to effectively simulate the challenges faced by seawater pumping and storage pipeline systems, such as high seawater flow rates and variable seawater flow directions. The next challenge is to design a corrosion performance evaluation device that simulates seawater operating conditions. This device can simulate the durability of materials in seawater pumping and storage systems under complex operating conditions, such as high-pressure water scouring, bidirectional water flow impact caused by switching between pumping and power generation modes, and seawater corrosion and biofouling.

[0004] Therefore, a device and method for evaluating the corrosion performance of materials in seawater pumping and storage under multiple operating conditions are proposed to solve the above problems. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a device and method for evaluating the corrosion performance of materials in seawater pumping and storage under multiple operating conditions.

[0006] The technical solutions of the present invention are as follows:

[0007] A device for evaluating the corrosion performance of materials under multiple operating conditions of seawater pumping storage, comprising a corrosion test chamber combined with a temperature control system and a flow rate control system working in coordination.

[0008] Corrosion test chamber: It includes a test chamber cylinder and a retractable inner part. The retractable inner part is provided with a sample holder. The inner wall of the test chamber cylinder is coated with a high corrosion-resistant and anti-fouling coating.

[0009] The temperature control system includes a heater, a temperature sensor and a temperature controller, which are used to close the loop and control the seawater temperature to a set value. The heater is arranged on the side wall of the simulated seawater pool to provide heat to the seawater. The temperature controller is arranged above the simulated seawater pool and a temperature sensor is provided at the bottom of the temperature controller to monitor the seawater temperature. The flow rate control system includes a simulated seawater pool, a circulation pump, a water suction pipe, a water supply pipe, a flow meter and a flow regulating valve. The simulated seawater pool is provided with an oxygenation interface, a pH meter and a temperature controller. The circulation pump is connected to the outlet of the simulated seawater pool through the water suction pipe and to the inlet of the corrosion test chamber through the water supply pipe. The flow meter and the flow regulating valve are connected in series to the water supply pipe to form a flow rate feedback regulation loop.

[0010] Preferably, the inner part can be pulled out to move axially along the test cavity cylinder, and the sample holder is made of corrosion-resistant metal or polymer material and is used to fix the pipeline material and coating sample to be tested at multiple angles.

[0011] Preferably, the temperature control system monitors the seawater temperature in real time through a temperature sensor, and the temperature controller starts and stops the heater according to a deviation signal between the set value and the measured value, and dynamically adjusts the heating power to maintain a constant temperature state.

[0012] Preferably, the simulated seawater pool is provided with a sediment addition port, a microorganism culture tank and an inorganic salt addition device for precisely controlling the sediment content, microorganism concentration and inorganic salt components of the simulated seawater.

[0013] Preferably, the flow regulating valve is a bidirectional electric control valve, which controls the flow direction and flow rate of seawater by adjusting the opening, simulating the bidirectional water flow impact caused by switching between pumping or power generation conditions.

[0014] Preferably, the oxygenation interface is connected to an oxygen supply device, and a pH meter is provided on the side wall of the simulated seawater pool for real-time regulation of the pH value of the seawater.

[0015] Preferably, a filter is provided on the passage connecting the corrosion test chamber to the microorganism culture tank in the simulated seawater pool for completing recycling.

[0016] Preferably, a pressure gauge is provided on the water supply pipe passage between the corrosion test chamber and the circulation pump for monitoring the passage pressure; and a thermometer is provided on the outer wall of the corrosion test chamber.

[0017] The present invention has the following beneficial effects:

[0018] 1. This invention combines and synergizes the innovative integrated temperature closed-loop control (i.e., heater, temperature sensor, and temperature controller) with a bidirectional flow rate control system (i.e., circulation pump and electric flow control valve) to dynamically reproduce core operating parameters such as high pressure, bidirectional water flow switching, and temperature fluctuations in seawater pumped storage power station pipelines. This addresses the industry pain point that traditional salt spray tests and coupon tests cannot simulate dynamic scouring and flow direction switching. It can simulate the effects of seawater temperature, flow rate, oxygen content, sediment content, and other factors on material corrosion in seawater pumped storage power station pipelines under simulated seawater operating conditions, and conduct performance evaluation.

[0019] 2. This invention uses an oxygenation interface to control oxygen content and a pH meter to monitor pH in real time. Combined with the modular design of the sediment addition port and microbial culture tank, it simultaneously simulates multiple failure mechanisms such as seawater corrosion, biofouling, and solid particle scouring, providing an evaluation environment close to service conditions for complex issues such as coating peeling and pitting corrosion.

[0020] 3. The high corrosion-resistant and anti-fouling coating and corrosion-resistant material selection on the inner wall of the corrosion test chamber of the present invention ensure the long-term stable operation of the device under simulated high-salt and high-flow rate conditions, thereby extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the overall device layout of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the corrosion test chamber of the present invention;

[0023] Figure 3 This is a schematic diagram of the test chamber cylinder mechanism of the present invention;

[0024] Figure 4 This is a schematic diagram of the drawable inner part mechanism of the present invention;

[0025] Figure 5 Schematic top view of the position distribution of the sample holder of the present invention.

[0026] The reference numerals in the figures are as follows:

[0027] 1. Test chamber cylinder; 2. Retractable internal parts; 3. Sample holder; 4. Heater; 5. Thermometer; 6. Temperature controller; 7. Water extraction pipe; 8. Water supply pipe; 9. Flow regulating valve; 10. Oxygenation interface; 11. Sediment addition port; 12. Microbial culture tank; 13. Inorganic salt filling device; 14. Corrosion test chamber; 15. Simulated seawater tank; 16. Circulation pump; 17. Flow meter; 18. pH meter; 19. Filter; 20. Pressure gauge; 21. Oxygen supply device. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0029] See also Figures 1 to 5 A corrosion performance evaluation device for materials under multiple operating conditions of seawater pumping and storage includes a corrosion test chamber 14, comprising a test chamber cylinder 1 and a retractable inner part 2, the retractable inner part 2 being provided with a sample holder 3, and the inner wall of the test chamber cylinder 1 being coated with a high corrosion resistance and antifouling coating;

[0030] Temperature control system: including heater 4, temperature sensor and temperature controller 6, for closed-loop control of seawater temperature to a set value. Heater 4 is installed on the side wall of simulated seawater pool 15 to provide heat to the seawater. Temperature controller 6 is installed above the simulated seawater pool and a temperature sensor is installed at the bottom of the temperature controller to monitor the seawater temperature.

[0031] The flow rate control system includes a simulated seawater pool 15, a circulation pump 16, a water extraction pipe 7, a water supply pipe 8, a flow meter 17 and a flow regulating valve 9. The simulated seawater pool 15 is provided with an oxygenation interface 10, a pH meter 18 and a temperature controller 6. The circulation pump 16 is connected to the water outlet of the simulated seawater pool 15 through the water extraction pipe 7 and to the inlet of the corrosion test chamber 14 through the water supply pipe 8. The flow meter 17 and the flow regulating valve 9 are connected in series to the water supply pipe 8 to form a flow rate feedback regulation loop.

[0032] Furthermore, the inner part 2 can be pulled out and moved axially along the test cavity cylinder 1. The sample holder 3 is made of corrosion-resistant metal or polymer material and is used to fix the pipeline material and coating sample to be tested at multiple angles.

[0033] Furthermore, the temperature control system monitors the seawater temperature in real time through a temperature sensor, and the temperature controller 6 starts and stops the heater 4 according to the deviation signal between the set value and the measured value, and dynamically adjusts the heating power to maintain a constant temperature state.

[0034] Furthermore, the simulated seawater pool 15 is provided with a sediment addition port 11, a microorganism culture tank 12 and an inorganic salt filling device 13, which are used to precisely control the sediment content, microorganism concentration and inorganic salt components of the simulated seawater.

[0035] Furthermore, the flow regulating valve 9 is a bidirectional electric control valve, which controls the flow direction and flow rate of seawater by adjusting the opening, simulating the bidirectional water flow impact caused by switching between pumping and power generation conditions.

[0036] Furthermore, the oxygenation interface 10 is connected to the oxygen supply device 21 , and a pH meter 18 is provided on the side wall of the simulated seawater pool 15 for real-time control of the pH value of the seawater.

[0037] Furthermore, a filter 19 is provided on the passage connecting the corrosion test chamber 14 to the microorganism culture tank 12 in the simulated seawater pool 15 for completing recycling.

[0038] Furthermore, a pressure gauge 20 is provided on the water supply pipe 8 between the corrosion test chamber 14 and the circulation pump 16 for monitoring the passage pressure; a thermometer 5 is provided on the outer wall of the corrosion test chamber 14 .

[0039] A performance evaluation method for a seawater pumped storage material corrosion performance evaluation device using multiple operating conditions uses the following steps:

[0040] S1. Preparation of simulated seawater: inject basic salt water into the simulated seawater pool 15, add sediment, microbial culture solution, inorganic salts and organic matter in sequence, adjust the pH value to 7-8 using the pH meter 18, and introduce oxygen through the oxygenation interface 10 until the dissolved oxygen concentration reaches the preset value;

[0041] S2, temperature control: start the heater 4 to heat the mixed liquid to the set temperature, and then adjust the heating power in real time through the temperature controller 6 to maintain a constant temperature state;

[0042] S3. Sample loading: Fix the pipeline material or coating sample to be tested to the sample holder 3 of the drawer inner part 2, then insert it into the corrosion test cavity 14 and seal it;

[0043] S4. Bidirectional flow rate simulation: a. Power generation operation simulation: Start the circulation pump 16 to drive water from the water supply pipe 8 to flow in the forward direction through the corrosion test chamber 14; b. Pumping operation simulation: Switch the opening direction of the flow control valve 9 to cause water to flow in the reverse direction; c. Feedback the opening of the flow control valve 9 through the flow meter 17 to control the flow rate;

[0044] S5. Accelerated corrosion test: Maintain the temperature control and bidirectional flow rate cycle of steps S2 and S4 for ≥ 72 hours;

[0045] S6. Performance evaluation: Take out the sample and calculate the corrosion rate by mass loss method or observe the coating peeling area by electron microscope.

[0046] Working principle of the present invention:

[0047] In the present invention, the corrosion test chamber 14 works in conjunction with a temperature control system and a flow rate control system. The corrosion test chamber 14 includes a test chamber cylinder 1 and a retractable inner part 2. The retractable inner part 2 is provided with a sample holder 3. The inner wall of the test chamber cylinder 1 is coated with a highly corrosion-resistant and anti-fouling coating. The retractable inner part 2 moves axially along the test chamber cylinder 1. The sample holder 3 is made of corrosion-resistant metal or polymer material and is used to fix the pipeline material and coating sample to be tested at multiple angles. The passage connecting the corrosion test chamber 14 to the microbial culture tank 12 in the simulated seawater pool 15 is provided with a filter 19 for recycling. A pressure gauge 20 is provided on the water supply pipe 8 between the corrosion test chamber 14 and the circulation pump 16 to monitor the passage pressure. A thermometer 5 is provided on the outer wall of the corrosion test chamber 14.

[0048] When the device is in operation, simulated artificial seawater is first added to the simulated seawater pool 15. The simulated seawater pool 15 is equipped with a sediment inlet 11, a microbial culture tank 12, and an inorganic salt injection device 13 for precisely controlling the sediment content, microbial concentration, and inorganic salt composition of the simulated seawater. The pH value is then adjusted to the specified requirements using a pH meter 18. Oxygen is then added to the simulated seawater pool 15 via an oxygen supply device 21 connected to an oxygenation interface 10. The heater 4 of the simulated seawater 15 is then turned on, and the heating temperature is set. The system automatically heats the simulated seawater to the set temperature and maintains the temperature constant. After the temperature of the simulated seawater remains stable for a period of time, the corrosion test chamber 14 is opened, and the test sample is placed and secured.

[0049] Finally, the circulation pump 16 is started, and the flow rate in the system reaches the preset value and remains stable through the opening of the inlet and outlet cross-line manual flow regulating valve 9 through the reading of the corresponding flow meter 17 in the corrosion test chamber 14. The flow regulating valve 9 is a two-way electric control valve, which controls the flow direction and flow rate of seawater by adjusting the opening to simulate the two-way water flow impact caused by the switching of pumping or power generation conditions; after the test time is reached, the circulation pump 16 and the flow regulating valve 9 are turned off, and the sample is taken out for corresponding evaluation.

[0050] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structures or equivalent process changes made using the contents of the present invention's description and drawings, or directly or indirectly applied to other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A device for evaluating the corrosion performance of materials in seawater pumped storage under multiple operating conditions, characterized by: A corrosion test chamber (14) comprises a test chamber cylinder (1) and a retractable inner part (2), wherein the retractable inner part (2) is provided with a sample holder (3), and the inner wall of the test chamber cylinder (1) is coated with a high corrosion-resistant antifouling coating; The temperature control system comprises a heater (4), a temperature sensor and a temperature controller (6), which is used for closed-loop control of the seawater temperature to a set value. The heater (4) is arranged on the side wall of the simulated seawater pool (15) to provide heat to the seawater. The temperature controller (6) is arranged above the simulated seawater pool and a temperature sensor is provided at the bottom of the temperature controller to monitor the seawater temperature. The flow rate control system comprises a simulated seawater pool (15), a circulation pump (16), a water extraction pipe (7), a water supply pipe (8), a flow meter (17) and a flow regulating valve (9); the simulated seawater pool (15) is provided with an oxygenation interface (10), a pH meter (18) and a temperature controller (6); the circulation pump (16) is connected to the water outlet of the simulated seawater pool (15) through the water extraction pipe (7) and is connected to the inlet of the corrosion test chamber (14) through the water supply pipe (8); the flow meter (17) and the flow regulating valve (9) are connected in series to the water supply pipe (8), forming a flow rate feedback regulation loop.

2. The corrosion performance evaluation device for materials in multiple operating conditions of seawater pumped storage according to claim 1 is characterized by: The retractable inner part (2) moves axially along the test cavity cylinder (1); the sample holder (3) is made of corrosion-resistant metal or polymer material and is used to fix the pipeline material and coating sample to be tested at multiple angles.

3. The corrosion performance evaluation device for materials in multiple operating conditions of seawater pumped storage according to claim 1 is characterized by: The temperature control system monitors the seawater temperature in real time through a temperature sensor, and the temperature controller (6) starts and stops the heater (4) according to a deviation signal between a set value and an actual value, and dynamically adjusts the heating power to maintain a constant temperature state.

4. The corrosion performance evaluation device for materials in multiple operating conditions of seawater pumped storage according to claim 1 is characterized by: The simulated seawater pool (15) is provided with a sediment addition port (11), a microorganism culture tank (12) and an inorganic salt filling device (13), and is used to precisely control the sediment content, microorganism concentration and inorganic salt components of the simulated seawater.

5. The corrosion performance evaluation device for materials in multiple operating conditions of seawater pumped storage according to claim 1 is characterized by: The flow regulating valve (9) is a bidirectional electric control valve, which controls the flow direction and flow rate of seawater by adjusting the opening, simulating the bidirectional water flow impact generated by switching between pumping and power generation operating conditions.

6. The corrosion performance evaluation device for materials in multiple operating conditions of seawater pumped storage according to claim 1 is characterized by: The oxygenation interface (10) is connected to an oxygen supply device (21), and a pH meter (18) is provided on the side wall of the simulated seawater pool (15) for real-time control of the pH value of seawater.

7. The corrosion performance evaluation device for materials in multiple operating conditions of seawater pumped storage according to claim 1 is characterized by: A filter (19) is provided on the passage connecting the corrosion test chamber (14) to the microorganism culture tank (12) in the simulated seawater pool (15) for completing recycling.

8. The device for evaluating corrosion performance of materials in multiple operating conditions for seawater pumped storage according to claim 1, characterized in that: A pressure gauge (20) is provided on the water supply pipe (8) between the corrosion test chamber (14) and the circulation pump (16) for monitoring the passage pressure; and a thermometer (5) is provided on the outer wall of the corrosion test chamber (14).

9. A method for evaluating the corrosion performance of seawater pumping storage materials, using the device for evaluating the corrosion performance of seawater pumping storage materials under multiple operating conditions according to any one of claims 1 to 8, characterized in that: The steps are as follows: S1. Preparation of simulated seawater: inject basic salt water into the simulated seawater pool (15), add sediment, microbial culture solution, inorganic salts and organic matter in sequence, adjust the pH value to 7-8 using a pH meter (18), and introduce oxygen through the oxygenation interface (10) until the dissolved oxygen concentration reaches a preset value; S2, temperature control: start the heater (4) to heat the mixed liquid to the set temperature, and then use the temperature controller (6) to adjust the heating power in real time to maintain a constant temperature state; S3. Sample loading: Fix the pipe material or coating sample to be tested to the sample holder (3) of the drawer inner part (2), then insert it into the corrosion test cavity (14) and seal it; S4, bidirectional flow rate simulation: a, power generation operation simulation, start the circulation pump (16) to drive the water flow from the water supply pipe (8) to flow through the corrosion test chamber (14) in the forward direction; b, pumping operation simulation, switch the opening direction of the flow control valve (9) to make the water flow in the reverse direction; c. Feedback the opening of the flow control valve (9) through the flow meter (17) to control the flow rate; S5. Accelerated corrosion test: Maintain the temperature control and bidirectional flow rate cycle of steps S2 and S4 for ≥ 72 hours; S6. Perform performance evaluation: Take out the sample and calculate the corrosion rate by the mass loss method, or observe the coating peeling area by electron microscopy.

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