A corrosion-resistant material testing device for an SCAL intercooling system and a use method thereof

Abstract

The application relates to the technical field of anti-corrosion material testing devices, and discloses an anti-corrosion material testing device for an SCAL type intercooling system and a use method, the testing device comprising a water tank, a corrosive water sample preparation unit, a corrosive water sample testing unit, an online sampling unit and a water quality purification unit; the water outlet of the water tank is connected with the pipeline of the corrosive water sample preparation unit; the corrosive water sample preparation unit; the corrosive water sample testing unit comprises a plurality of test pipe fittings with bending angles, and is used for simulating the performance of the test pipe fittings in the bending shape to the corrosion working condition; the corrosive water sample preparation unit is also connected with the pipeline of the online sampling unit and the water quality purification unit respectively; the water quality purification unit is connected with the water inlet of the water tank, and is used for purifying the corrosive water sample flowing back to the water tank. The device solves the problems of the missing of the bending pipe corrosion test and the insufficient of the multi-water quality monitoring, simulates the corrosion working condition of the bending section, and the online sampling unit tracks the water quality fluctuation.

Description

Technical Field

[0001] This invention relates to the technical field of corrosion-resistant material testing devices, specifically to a corrosion-resistant material testing device and its usage method for SCAL type intercooling systems. Background Technology

[0002] With the continuous development of water-saving technologies in thermal power plants, surface-type indirect air-cooled systems (hereinafter referred to as "indirect cooling systems") have been widely used in large-capacity units due to their significant water-saving effects. However, the circulating cooling water in indirect cooling systems has special characteristics, typically being high-purity demineralized water or softened water treated with weak acid. The corrosion of thermal equipment and pipe materials during closed or semi-closed circulation processes is becoming increasingly prominent. In actual operation, circulating water can cause varying degrees of electrochemical corrosion to various metal materials such as carbon steel, stainless steel, copper alloys, and galvanized layers. Especially under the influence of high oxygen content, temperature fluctuations, and changes in flow rate, carbon steel pipes are prone to uniform corrosion or localized pitting corrosion. Corrosion products entering the system may deposit on the inner wall of the radiator tube bundle, leading to decreased heat exchange efficiency, increased flow resistance, and in severe cases, tube bundle leaks or even shutdown accidents. Furthermore, due to the large size and complex operating conditions of the on-site system, corrosion is difficult to monitor in real time, and the correlation between corrosion products and water quality changes is difficult to quantitatively assess, making it impossible for operators to accurately determine the effectiveness of the current water treatment plan.

[0003] More importantly, the water quality indicators of the circulating cooling water in the indirect cooling system are not constant. Under dynamic operating conditions such as system start-up and shutdown, load changes, water replenishment, and sewage discharge, key parameters such as dissolved oxygen, pH value, conductivity, and chloride ion concentration in the water will fluctuate significantly. This dynamic fluctuation characteristic makes traditional corrosion control methods based on steady-state water quality difficult to adapt to actual operating requirements. When water quality indicators change drastically in a short period of time, the electrochemical corrosion rate of the pipe inner wall changes accordingly, and local areas may show accelerated corrosion tendencies. However, existing monitoring methods are mostly offline sampling or fixed-point online monitoring, which are difficult to capture the dynamic response relationship between instantaneous changes in water quality parameters and corrosion processes. On the other hand, the piping layout of the indirect cooling system is complex, with many bends, diameter changes, and welded joints. These parts are prone to turbulence, eddies, and uneven velocity distribution during fluid flow, resulting in significant differences in local mass transfer conditions compared to straight pipe sections. However, existing technologies lack specific experimental research and evaluation methods for the corrosion behavior of pipe materials at bends. Material selection and protection design are typically based solely on corrosion test data from straight pipe sections or general material standard parameters, neglecting the differences in corrosion susceptibility caused by processing stress, residual stress, and changes in flow conditions at bends. This design blind spot makes bends a high-risk area for corrosion leaks in indirect cooling systems, severely hindering the safe and stable operation of the system. Summary of the Invention

[0004] To address existing problems, this invention provides a corrosion-resistant material testing device and method for SCAL-type intercooling systems. This device, through a multi-unit collaborative design, systematically solves the technical challenges of insufficient corrosion testing for bent pipes and inadequate monitoring of dynamic water quality response in existing technologies. Specifically, the testing unit simulates operating conditions at bends in the intercooling system piping, accurately reproducing the corrosion behavior of the bend under the coupled effects of turbulence, stress, and water quality fluctuations, thus overcoming the blind spots in material selection based solely on straight pipe test data. The online sampling unit can track the instantaneous changes in key indicators such as dissolved oxygen, pH, and conductivity of circulating water under dynamic operating conditions, accurately capturing the dynamic correlation between water quality fluctuations and the corrosion process. Simultaneously, the water purification unit enables the recycling of test water samples, significantly reducing the water cost for long-term corrosion testing, while the corrosion water sample preparation unit supports flexible configuration of different water quality conditions, providing a reliable experimental platform for studying the impact of fluctuating water quality indicators on corrosion behavior. The integration of the above functions enables this device to fully simulate the actual operating conditions of the SCAL type intercooling system, providing more accurate test data for the selection of intercooling system pipes, optimization of protection schemes, and corrosion early warning.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] This invention provides a corrosion-resistant material testing device for an SCAL type intercooling system, comprising a water tank, a corrosion water sample preparation unit, a corrosion water sample testing unit, an online sampling unit, and a water purification unit. The outlet of the water tank is connected to the corrosion water sample preparation unit via piping to provide the water required for corrosion water sample preparation. The corrosion water sample preparation unit is used to prepare corrosion water samples under different water quality conditions and is connected to the corrosion water sample testing unit via piping. The corrosion water sample testing unit includes multiple test pipes with bending angles to simulate the corrosion performance of the test pipes when they are bent. The corrosion water sample preparation unit is also connected to the online sampling unit and the water purification unit via piping, respectively. The online sampling unit is used to simultaneously monitor the water quality conditions of the corrosion water samples produced by the corrosion water sample preparation unit. The water purification unit is connected to the inlet of the water tank to purify the corrosion water samples returning to the water tank.

[0007] As a further improvement of the present invention, the corrosion water sample testing unit includes a total test flow meter, a diversion regulating valve, and a flushing test assembly; the total test flow meter, the diversion regulating valve, and the flushing test assembly are connected in parallel through pipelines, and the parallel flow path is connected to the corrosion water sample preparation unit and the water quality purification unit respectively; the flushing test assembly includes a diversion flushing pipe 43 and a return flushing pipe 44, and the diversion flushing pipe 43 and the return flushing pipe 44 are respectively connected to the two ends of several test pipes with bending angles.

[0008] As a further improvement of the present invention, the corrosion water sample testing unit also includes a fan, the effective range of which covers the scouring test assembly.

[0009] As a further improvement of the present invention, the test fitting with bending angle includes a 0° angle straight pipe, a 45° angle fitting and a 90° angle fitting.

[0010] As a further improvement of the present invention, the test fitting is connected to the diversion flushing pipe and the return flushing pipe via a union, and a sealing ring is provided at the interface of the union.

[0011] As a further improvement of the present invention, a carbon steel assembly is also included, which is connected in series with the total test flow meter. The carbon steel assembly includes a stainless steel fastener, a hanging wire, and a carbon steel test piece; the stainless steel fastener is connected to the carbon steel test piece through the hanging wire.

[0012] As a further improvement of the present invention, the corrosion water sample preparation unit includes a circulating water tank, a gas storage tank, and a dosing device; the circulating water tank is equipped with a heating coil and a level gauge; the circulating water tank is connected to the dosing device and the gas storage tank respectively, and the gas storage tank includes at least N2, O2, hydrazine and CO2 gas storage tanks; the dosing device is used to add corrosion inhibitors.

[0013] As a further improvement of the present invention, the sampling unit includes an online sampling device, the inlet of which is equipped with a sampling valve, and the outlet of which is equipped with a drain valve.

[0014] As a further improvement of the present invention, the water purification device includes a mixed bed and a filter, the mixed bed and the filter being connected in parallel with a direct bypass, and a second direct manual valve being provided on the direct bypass.

[0015] The present invention also provides a method for using a corrosion-resistant material testing device for SCAL type intercooling systems, comprising the following steps: Initial water is supplied to the corrosion water sample preparation unit through a water tank. The corrosion water sample preparation unit is used to prepare corrosion water samples with different temperatures, gas compositions and corrosion inhibitor concentrations according to different preset water quality requirements. The prepared corrosion water sample is transported to the corrosion water sample testing unit. The total flow rate of the corrosion water sample entering the corrosion water sample testing unit is monitored, and the flow rate of the corrosion water sample is adjusted. In addition, according to the testing requirements, multiple test pipes with bending angles are flushed to simulate the corrosion performance of the test pipes when they are in a bent shape. During the test, the water quality conditions of the corrosive water sample produced by the corrosion water sample preparation unit were monitored synchronously through the online sampling unit. After the test, the drain valve was opened to discharge the waste liquid after sampling. After the test is completed, the corrosive water sample is transported to the water purification unit through pipelines. The water purification unit purifies the corrosive water sample. After purification or direct return, the corrosive water sample can be reused for water sample preparation, realizing the recycling of water samples.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This device is designed with multiple functional units to comprehensively simulate the actual working conditions of a SCAL-type intercooling system. A water tank provides the water source, a corrosion sample preparation unit can flexibly configure water samples with different water quality conditions, a testing unit simulates corrosion conditions of bent pipe fittings, an online sampling unit monitors water quality in real time, and a water purification unit enables water sample recycling, reducing testing costs and improving testing efficiency and accuracy.

[0017] Preferably, the total test flow meter, the diversion regulating valve, and the flushing test assembly are connected in parallel, allowing for flexible flow adjustment to meet different testing requirements. The flushing test assembly connects to the test pipes via diversion and return flushing pipes, enabling batch testing of multiple types of pipes simultaneously. This simulates, to the greatest extent possible, multiple easily corroded points in the intercooling system piping being simultaneously connected to circulating water samples under the same water quality conditions, testing the corrosion resistance of batches of pipes and improving the true reflection of the reliability of the entire system by the test results.

[0018] Preferably, the fan's effective range covers the scouring test components, which can simulate the effect of airflow on pipe corrosion in the actual environment, making the test conditions closer to the actual situation and further improving the accuracy and practicality of the test results.

[0019] Preferably, 0° angle straight pipes, 45° angle pipe fittings, and 90° angle pipe fittings are provided to simulate the corrosion conditions of pipe fittings with different bending angles, and to more comprehensively evaluate the corrosion resistance of the material in different bending pipe fittings, providing a more sufficient reference for practical applications. At the same time, multiple types of pipes are tested in batches to simulate multiple easily corroded points in the intercooling system piping being connected to circulating water samples with the same water quality conditions to the greatest extent, testing the corrosion resistance of batches of pipes, and improving the test results to truly reflect the reliability of the entire system.

[0020] Preferably, the test fittings are connected via unions, facilitating installation and disassembly, and allowing for easy replacement with fittings of different materials or specifications for testing. A sealing ring is installed at the union joint to prevent water sample leakage during testing, ensuring the accuracy and stability of the test.

[0021] Preferably, the carbon steel assembly is connected in series with the total test flow meter to monitor the corrosion of the carbon steel specimen in corrosive water samples, providing a direct reflection of the material's corrosion resistance. The design of the stainless steel fasteners and hanging wires facilitates the installation and suspension of the carbon steel specimen, making the testing operation simpler.

[0022] Preferably, the circulating water tank of the corrosion water sample preparation unit is equipped with a heating coil and a level gauge to precisely control the water sample temperature and level. Connected to a dosing device and various gas storage tanks, it allows for flexible addition of corrosion inhibitors and adjustment of gas composition, enabling the preparation of corrosion water samples that better match actual working conditions and improving the relevance of the testing.

[0023] Preferably, the online sampling device is equipped with a sampling valve at the inlet and a drain valve at the outlet to facilitate control of sampling and draining operations. It can acquire corrosive water samples in real time for monitoring, promptly understand water quality changes, provide a basis for adjusting test parameters, and ensure the smooth progress of the test.

[0024] Preferably, the mixed bed and filter of the water purification device are connected in parallel with a direct bypass, allowing for flexible selection of the purification method based on water quality conditions. The inclusion of a direct manual valve facilitates direct backflow of water samples when needed, improving the device's operational flexibility and water purification efficiency.

[0025] This method of application details and standardizes the testing process, from water sample preparation, transportation and testing, online monitoring to purification and reflux, with each step closely linked to ensure the orderly conduct of the test. It enables water sample recycling, reduces testing costs, and provides a comprehensive and accurate assessment of the material's corrosion resistance in SCAL-type intercooling systems. Attached Figure Description

[0026] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and are not intended to specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a schematic diagram of a corrosion-resistant material testing device for a SCAL type intercooling system in Example 1; Figure 2 This is a cross-sectional view of the carbon steel component in Example 1; Figure 3 This is a cross-sectional view of the test pipe connection in Example 1.

[0027] The components include: 1. Heating coil inlet; 2. Heating coil outlet; 3. Circulating water tank; 4. Level gauge; 5. Drain valve; 6. Dosing solenoid valve; 7. Dosing device; 8. Vent valve (nitrogen, oxygen, hydrazine, carbon dioxide vent valve); 9. Circulating water pump; 10. Sampling valve; 11. Online sampling device; 12. Sampling drain valve; 13. First straight-through manual valve; 14. Sampling bypass; 15. Total test flow control valve; 16. Carbon steel assembly; 17. Total test flow meter; 18. Diverter regulating valve; 19. Solenoid regulating valve (0° angle straight pipe); 20. Test pipe flow meter (0° angle straight pipe); 21. 0° angle straight pipe; 22. 23. Electromagnetic regulating valve (45° angle fitting); 24. Test pipe flow meter (45° angle fitting); 25. 45° angle fitting; 26. Electromagnetic regulating valve (90° angle fitting); 27. Test pipe flow meter (90° angle fitting); 28. 90° angle fitting; 29. ​​Fan; 30. Main pipeline control solenoid valve; 31. Second straight-through manual valve; 32. Control solenoid valve; 33. Filter; 34. Mixed bed; 35. Water tank; 36. Water tank drain valve; 37. Connector; 38. Stainless steel fastener; 39. Hanging wire; 40. Carbon steel test piece; 41. Sealing ring; 42. Union; 43. Diverter flushing pipe; 44. Return flushing pipe. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0029] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Example 1 like Figure 1 As shown, this embodiment provides a corrosion-resistant material testing device for a SCAL type indirect cooling system, including a water tank 34, a corrosion water sample preparation unit, a corrosion water sample testing unit, an online sampling unit, and a water purification unit. The outlet of the water tank 34 is connected to the corrosion water sample preparation unit via piping to provide the water required for corrosion water sample preparation. The corrosion water sample preparation unit is used to prepare corrosion water samples under different water quality conditions and is connected to the corrosion water sample testing unit via piping. The corrosion water sample testing unit includes multiple test pipes with bending angles to simulate the corrosion performance of the test pipes when they are bent. The corrosion water sample preparation unit is also connected to the online sampling unit and the water purification unit via piping. The online sampling unit is used to simultaneously monitor the water quality conditions of the corrosion water samples produced by the corrosion water sample preparation unit. The water purification unit is connected to the inlet of the water tank 34 to purify the corrosion water samples returning to the water tank 34.

[0032] Specifically, water tank 34 is a closed expansion tank, and a drain valve 35 is provided at the bottom of the expansion tank. The outlet of water tank 34 is connected to the pipeline of the corrosion water sample preparation unit.

[0033] Specifically, the corrosion water sample preparation unit includes a circulating water tank 3, a gas storage tank, and a dosing device 7. In this embodiment, the circulating water tank 3 is equipped with a heating coil and a level gauge 4. The heating coil is serpentine, and its inlet 1 and outlet 2 are respectively connected to the inlet and outlet pipes of the heat exchange medium. The level gauge 4 is a magnetic reversing level gauge. A drain valve 5 is provided at the bottom of the circulating water tank 3. The gas storage tank includes N2, O2, hydrazine, and CO2 storage tanks, which are connected to the circulating water tank 3 through pipelines. A vent valve 8 is provided on the pipelines. Specifically, it is an integrated regulating device with parallel oxygen, nitrogen, carbon dioxide, and hydrazine pipelines. This device can be activated individually or multiple pipelines simultaneously to regulate the pH and dissolved oxygen content of the water. The dosing device 7 is used to add corrosion inhibitors and is connected to the circulating water tank 3 through a dosing solenoid valve 6. The water quality for filling the circulating water tank 3 can also be water sampled from the power plant site.

[0034] Specifically, the corrosion water sample testing unit includes a total test flow meter 17, a flow diversion regulating valve 18, and a flushing test assembly. The total test flow meter 17, the flow diversion regulating valve 18, and the flushing test assembly are connected in parallel via pipelines. The parallel flow path is connected to the corrosion water sample preparation unit and the water purification unit, respectively. The total test flow meter 17 is connected in series with the total test flow control valve 15 and the carbon steel assembly 16. The total test flow meter 17 is a rotor flow meter. Figure 2As shown, the carbon steel assembly 16 includes stainless steel fasteners 37, hanging wires 38, and carbon steel test pieces 39. The stainless steel fasteners 37 are connected to the carbon steel test pieces 39 via the hanging wires 38. The carbon steel test pieces 39 are secured to the stainless steel fasteners 37 (or stainless steel rods) at both ends of the flanges via the hanging wires 38 (fishing line can be used). The housing of the carbon steel assembly 16 is made of transparent acrylic glass, facilitating observation of the corrosion process. The branch circuits of the carbon steel assembly 16 are controlled by a main test flow control valve 15.

[0035] The flushing test assembly includes a diversion flushing pipe 43 and a return flushing pipe 44, which are connected to the two ends of multiple test pipes with bending angles via connectors 36. In this embodiment, the test pipes with bending angles include a 0° angle straight pipe 21, a 45° angle pipe 24, and a 90° angle pipe 27. Each branch of the test pipe is equipped with an independent electromagnetic regulating valve (19, 22, 25) and a test pipe flow meter (20, 23, 26). A fan 28 is located above the entire flushing test assembly, and the effective range of the fan 28 covers the flushing test assembly to simulate a heat dissipation environment.

[0036] Optionally, the flushing test assembly may be equipped with a main pipeline control solenoid valve 29 for flow control.

[0037] Furthermore, such as Figure 3 As shown, the test fittings (such as 0° angle straight pipe 21, 45° angle fitting 24, or 90° angle fitting 27) are connected to the diversion flushing pipe 43 and the return flushing pipe 44 via union 41. The test fittings can be made of pure aluminum, carbon steel, aluminum alloy, or other materials used in thermal power plant circulating water pipelines. In addition to having different bending angles, the test fittings can also have different diameter-changing sections, such as reduced diameter sections, expanded diameter sections, or various diameter-changing sections. The bending angles and diameter-changing sections of the test fittings can be stacked to maximize the simulation of actual working pipeline designs. The connector 36 is a union 41 made of polytetrafluoroethylene (PTFE) with internal threads, and a sealing ring 40 is provided at its interface to ensure sealing. The diversion flushing pipe 43 and the return flushing pipe 44 are made of acrylic glass.

[0038] Specifically, the online sampling unit includes an online sampling device 11, used to simultaneously monitor the water quality conditions of the circulating water (such as dissolved oxygen, pH value, conductivity, turbidity, suspended solids, etc.). The online sampling device 11 is connected to the outlet pipe of the circulating water tank 3 through a sampling bypass 14; a sampling valve 10 is equipped on the sampling bypass 14, and a sampling drain valve 12 is equipped at the outlet of the online sampling device 11.

[0039] Specifically, the outlet of the water purification unit is connected to the inlet of the water tank 34 for purifying the returned water sample. The water purification device includes a mixed bed 33 and a filter 32. The mixed bed 33 and the filter 32 are connected in parallel with a direct bypass, and a second direct manual valve 30 is installed on the direct bypass. A control solenoid valve 31 is installed on the main line of the mixed bed 33 and the filter 32. By controlling the solenoid valve 31, part or all of the returned water can flow through the purification unit or the bypass. The mixed bed 33 is used to remove impurity ions; the filter 32 is a multi-media filter, which can use quartz sand and activated carbon as filter media to effectively remove suspended solids in the water.

[0040] A circulating water pump 9 and a first direct-access manual valve 13 are provided between the corrosion water sample preparation unit and the corrosion water sample testing unit.

[0041] This embodiment also provides a method for using a corrosion-resistant material testing device for SCAL type intercooling systems, including the following steps: Initial water is supplied to the corrosion water sample preparation unit through water tank 34. The corrosion water sample preparation unit is used to prepare corrosion water samples with different temperatures, gas compositions and corrosion inhibitor concentrations according to different preset water quality requirements. The prepared corrosion water sample is transported to the corrosion water sample testing unit. The total flow rate of the corrosion water sample entering the corrosion water sample testing unit is monitored, and the flow rate of the corrosion water sample is adjusted. In addition, according to the testing requirements, multiple test pipes with bending angles are flushed to simulate the corrosion performance of the test pipes when they are in a bent shape. During the test, the water quality conditions of the corrosive water sample produced by the corrosion water sample preparation unit were monitored synchronously through the online sampling unit. After the test, the sampling drain valve 12 was opened to discharge the waste liquid after sampling. After the test is completed, the corrosive water sample is transported to the water purification unit through pipeline. The water purification unit purifies the corrosive water sample. After purification or direct return, the corrosive water sample is returned to the water tank 34 and can be reused for water sample preparation, realizing the recycling of water samples.

[0042] Example 2 This embodiment provides a method for using a corrosion-resistant material testing device for SCAL type intercooling systems, including the following steps: S1. Water Sample Preparation Stage: Initial water is supplied to the corrosion water sample preparation unit through water tank 34. Using the circulating water tank 3, gas storage tank and dosing device 7 in the corrosion water sample preparation unit, the water temperature is adjusted by controlling the heating coil according to different preset water quality requirements. The water level is monitored by the level gauge. The corresponding gas is selected from the N2, O2, hydrazine and CO2 gas storage tanks and introduced into the circulating water tank 3. Corrosion inhibitors are added through the dosing device 7 to prepare corrosion water samples with different temperatures, gas compositions and corrosion inhibitor concentrations. S2. Test Preparation Stage: The prepared corrosion water sample is transported to the corrosion water sample test unit. The total flow rate of the corrosion water sample entering the corrosion water sample test unit is monitored by the total test flow meter 17. The corrosion water sample is diverted by the diversion regulating valve 18, so that part of the corrosion water sample enters the flushing test assembly. According to the test requirements, the appropriate pipe fittings are selected from the test pipe fittings with 0° angle straight pipe 21, 45° angle pipe fitting 24 and 90° angle pipe fitting 27. The two ends of the test pipe fittings are connected to the diversion flushing pipe 43 and the return flushing pipe 44 respectively by the union 41. The sealing ring 40 at the interface of the union 41 ensures that there is no leakage at the connection. At the same time, the carbon steel assembly is connected in series with the total test flow meter 17, and the carbon steel test piece 39 is fixed in a suitable position by the stainless steel fastener 37 and the hanging wire 38. S3. Corrosion Testing Stage: Start the corrosion water sample testing unit to circulate the corrosion water sample in the test pipe and the scouring test assembly, simulating the corrosion performance of the test pipe when it is bent; turn on fan 28 to cover the scouring test assembly, simulating the wind scouring environment under actual working conditions; during the test, open the sampling valve 10 through the online sampling device in the online sampling unit to simultaneously monitor the water quality conditions of the corrosion water sample produced by the corrosion water sample preparation unit; after the test, open the drain valve to discharge the waste liquid after sampling. S4. Water Sample Purification and Circulation Stage: After the test is completed, the corrosive water sample is transported to the water purification unit through pipeline. The mixed bed and filter in the water purification unit purify the corrosive water sample. When deep purification is not required, the second direct manual valve 30 on the direct bypass is opened, allowing the corrosive water sample to flow directly back to the water tank 34 through the direct bypass. After the corrosive water sample is purified or directly returned to the water tank 34, it can be used again for water sample preparation in step S1, realizing the recycling of water samples.

[0043] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A corrosion-resistant material testing device for SCAL type intercooling systems, characterized in that, The system includes a water tank (34), a corrosion water sample preparation unit, a corrosion water sample testing unit, an online sampling unit, and a water purification unit. The outlet of the water tank (34) is connected to the pipeline of the corrosion water sample preparation unit to provide water required for corrosion water sample preparation. The corrosion water sample preparation unit is used to prepare corrosion water samples with different water quality conditions and is connected to the pipeline of the corrosion water sample testing unit. The corrosion water sample testing unit includes multiple test pipes with bending angles to simulate the performance of the test pipes under corrosion conditions when they are bent. The corrosion water sample preparation unit is also connected to the pipelines of the online sampling unit and the water purification unit. The online sampling unit is used to simultaneously monitor the water quality conditions of the corrosion water samples produced by the corrosion water sample preparation unit. The water purification unit is connected to the inlet of the water tank (34) to purify the corrosion water samples returning to the water tank (34).

2. The corrosion resistance material testing device for SCAL type intercooling systems according to claim 1, characterized in that, The corrosion water sample testing unit includes a total test flow meter (17), a diversion regulating valve (18), and a flushing test assembly. The total test flow meter (17), the diversion regulating valve (18), and the flushing test assembly are connected in parallel through pipelines. The parallel flow path is connected to the corrosion water sample preparation unit and the water quality purification unit, respectively. The flushing test assembly includes a diversion flushing pipe (43) and a return flushing pipe (44). The diversion flushing pipe (43) and the return flushing pipe (44) are respectively connected to the two ends of several test pipes with bending angles.

3. The corrosion resistance material testing device for SCAL type intercooling systems according to claim 2, characterized in that, The corrosion water sample testing unit also includes a fan (28), the range of which covers the scouring test assembly.

4. The corrosion resistance material testing device for SCAL type intercooling systems according to claim 2, characterized in that, The test fittings with bending angles include a 0° angle straight pipe (21), a 45° angle fitting (24), and a 90° angle fitting (27).

5. The corrosion resistance material testing device for SCAL type intercooling systems according to claim 2, characterized in that, The test tube is connected to the diversion flushing tube (43) and the return flushing tube (44) via a connector (36), and a sealing ring (40) is provided at the interface of the connector (36).

6. The corrosion resistance material testing device for SCAL type intercooling systems according to claim 2, characterized in that, It also includes a carbon steel assembly (16), which is connected in series with the total test flow meter (17). The carbon steel assembly (16) includes a stainless steel fastener (37), a hanging wire (38), and a carbon steel test piece (39). The stainless steel fastener (37) is connected to the carbon steel test piece (39) through the hanging wire (38).

7. The corrosion resistance material testing device for SCAL type intercooling systems according to claim 1, characterized in that, The corrosion water sample preparation unit includes a circulating water tank (3), a gas storage tank, and a dosing device (7); the circulating water tank (3) is equipped with a heating coil and a level gauge (4); the circulating water tank (3) is connected to the dosing device (7) and the gas storage tank respectively, and the gas storage tank includes at least N2, O2, hydrazine and CO2 gas storage tanks; the dosing device (7) is used to add corrosion inhibitors.

8. The corrosion resistance material testing device for SCAL type intercooling systems according to claim 1, characterized in that, The sampling unit includes an online sampling device (11), the inlet of which is equipped with a sampling valve (10), and the outlet of which is equipped with a drain valve (12).

9. The corrosion resistance material testing device for SCAL type intercooling systems according to claim 1, characterized in that, The water purification device includes a mixed bed (33) and a filter (32). The mixed bed (33) and the filter (32) are connected in parallel with a direct bypass. A second direct manual valve (30) is provided on the direct bypass.

10. A method of using a corrosion-resistant material testing device for a SCAL type intercooling system according to any one of claims 1 to 9, characterized in that, Includes the following steps: Initial water is supplied to the corrosion water sample preparation unit through the water tank (34). Corrosion water samples with different temperatures, gas compositions and corrosion inhibitor concentrations are prepared using the corrosion water sample preparation unit according to different preset water quality requirements. The prepared corrosion water sample is transported to the corrosion water sample testing unit. The total flow rate of the corrosion water sample entering the corrosion water sample testing unit is monitored, and the flow rate of the corrosion water sample is adjusted. In addition, according to the testing requirements, multiple test pipes with bending angles are flushed to simulate the corrosion performance of the test pipes when they are in a bent shape. During the test, the water quality conditions of the corrosive water sample produced by the corrosion water sample preparation unit were monitored synchronously through the online sampling unit. After the test, the drain valve (12) was opened to discharge the waste liquid after sampling. After the test is completed, the corrosive water sample is transported to the water purification unit through the pipeline. The water purification unit purifies the corrosive water sample. After purification or direct return, the corrosive water sample is returned to the water tank (34) and can be reused for water sample preparation, realizing the recycling of water samples.

Images