Gas-liquid-solid three-phase porous jet erosion corrosion experimental device and experimental method

Abstract

The invention discloses a gas-liquid-solid three-phase porous jet erosion corrosion experimental device and experimental method, and belongs to the technical field of erosion corrosion experimental testing. The experimental device comprises a jet system, a sand adding system and a gas injection system, the jet system comprises a jet chamber, and a bearing device for mounting a sample to be tested is arranged in the jet chamber; a jet main pipeline is arranged on the jet chamber, the tail end of the jet main pipeline is connected with a nozzle, and the outlet center of the nozzle is over against the surface center of the to-be-tested sample; the sand adding system comprises a sand bearing measuring cylinder, and a bottom outlet of the sand bearing measuring cylinder is communicated with the top of the jet flow main pipeline; the air injection system comprises an air compressor, and the air compressor is connected with a liquid input pipeline through an air injection pipeline; the to-be-tested sample is connected with a copper conductor to serve as a working electrode, and a counter electrode and a reference electrode are further arranged in the jet chamber. The device can be used for gas-liquid-solid three-phase jet flow experiments and under-pressure / non-under-pressure experiment tests, and has wider and practical functions.

Description

Technical Field

[0001] This invention belongs to the field of erosion corrosion testing technology, specifically relating to a gas-liquid-solid three-phase porous jet erosion corrosion test device and test method. Background Technology

[0002] Three-phase flow erosion corrosion refers to a complex destructive process in which mechanical erosion and electrochemical corrosion mutually promote each other on the material surface under the combined action of gas, liquid, and solid media. This form of destruction is more complex and severe than that of single-phase or two-phase flow because, in three-phase flow, the cutting action of solid particles, the corrosiveness of the liquid phase, and the turbulence and cavitation effects of the gas phase produce a synergistic effect, accelerating the material failure process.

[0003] Erosion corrosion from three-phase flow (gas, liquid, solid) exists in numerous industrial sectors. In the oil and gas industry, pipelines and equipment frequently encounter multiphase flow media containing sand (solid), crude oil or water (liquid), and associated gas (gas). Particularly in choke-and-kill manifolds, the fluctuating internal pressure generated by the reciprocating motion of the upstream plunger pump causes the manifold material to simultaneously bear the combined effects of dynamic stress and three-phase flow erosion, making it more prone to leaks and even ruptures. In marine engineering, seawater pipeline systems are subjected to the combined effects of seawater (liquid), silt (solid), and air bubbles (gas), with the high temperature, high humidity, and high salinity further exacerbating the erosion corrosion process. In the chemical process industry, three-phase flows formed by various reaction media and catalyst particles also cause severe damage to equipment.

[0004] The material loss rate under three-phase flow conditions is far higher than the sum of the effects of single corrosion or pure mechanical erosion. This synergistic effect is mainly manifested in the following ways: solid particles destroy the protective film on the material surface, and fresh metal exposed to the corrosive medium accelerates corrosion; the presence of the gas phase leads to changes in flow pattern and bubble collapse, resulting in cavitation erosion; the liquid phase not only provides the corrosive environment but also acts as a carrier to transport solid particles and gases, exacerbating material degradation. Therefore, developing experimental apparatus and methods specifically for three-phase flow erosion corrosion is of great significance for understanding this complex phenomenon and improving the safety and service life of industrial equipment. Summary of the Invention

[0005] Based on the above-mentioned technical problems, this invention proposes a gas-liquid-solid three-phase porous jet erosion corrosion experimental device and experimental method.

[0006] The technical solution adopted in this invention is: A gas-liquid-solid three-phase porous jet erosion corrosion experimental device includes a jet system, a sand feeding system, and a gas injection system; The jet system includes a jet chamber, inside which is a support device for mounting the test sample; a top cover is installed at the top of the jet chamber, through which a main jet pipe passes, and the end of the main jet pipe is connected to a nozzle, with the nozzle outlet center facing the center of the surface of the test sample. The main jet pipe is also connected to the liquid input pipe, and the bottom of the jet chamber is connected to the liquid output pipe. The liquid output pipe is connected to the liquid input pipe through a centrifugal pump. The sand adding system includes a sand-collecting cylinder with volume markings and an openable cover plate at the top. The bottom outlet of the sand-collecting cylinder is connected to the top of the jet main pipe, and a first control valve is installed at the bottom outlet of the sand-collecting cylinder. The gas injection system includes an air compressor and a gas injection pipeline. The outlet of the air compressor is connected to one end of the gas injection pipeline, and the other end of the gas injection pipeline is connected to a liquid input pipeline. A gas flow meter and a second control valve are installed on the gas injection pipeline. The test sample is also connected to a conductor to form a working electrode. A counter electrode and a reference electrode are also provided in the jet chamber. The working electrode, counter electrode, and reference electrode are all fixed on the top cover.

[0007] Preferably, the bearing device includes an inclined base and a bearing platform, with the inclined base disposed on the bearing platform; one side of the inclined base is inclined and is an inclined surface, and an annular threaded groove is formed on the inclined surface, which cooperates with a hollow screw; The test sample is circular and placed on the inclined surface of the inclined base, inside the annular thread groove. When the hollow screw is screwed into the annular thread groove, it presses the test sample and fixes it on the inclined base.

[0008] Preferably, the hollow screw includes a nut and a threaded section, one end of which is integrally connected to the nut. A through hole is provided at the center of the nut and the threaded section, and an inner edge is provided around the nut corresponding to the through hole. The external thread on the threaded section is adapted to the internal thread groove on the annular thread groove. When the hollow screw is screwed into the annular thread groove, the threaded section is screwed into the annular thread groove, the inner edge of the nut presses against the edge of the test sample, and the position of the test sample facing the through hole is exposed. An annular rubber ring is provided between the inner edge of the nut and the test sample; The conductor is a copper conductor; the inclined base and the hollow screw are both made of polyethylene material.

[0009] Preferably, multiple support devices are provided and arranged around the perimeter of the main jet pipe inside the jet chamber, and the main jet pipe is arranged vertically; multiple nozzles are also provided, and multiple nozzles are arranged at intervals around the bottom outlet of the main jet pipe, with the center of the outlet of each nozzle facing the center of the surface of the sample to be tested on one of the support devices.

[0010] Preferably, the top cover of the jet chamber is provided with an injection port, which is connected to a gas storage cylinder through an injection pipe; Pressure sensors, temperature sensors, and a relief valve are also installed on the top cover of the jet chamber.

[0011] Preferably, the device further includes a cooling system, which includes a cooling water machine, an outlet pipe, a return pipe, and a sleeve. The sleeve is fitted over the outside of the liquid output pipe and the liquid input pipe, and the interlayer between the sleeve and the liquid output pipe and the liquid input pipe respectively forms a cooling water flow channel. The outlet of the cooling water machine is connected to one end of the sleeve through the outlet pipe, and the other end of the sleeve is connected to the return port of the cooling water machine through the return pipe.

[0012] Preferably, an electromagnetic flow meter is also installed on the liquid input pipeline; the centrifugal pump is also connected to a frequency converter; The test sample is a metal sample; The first control valve is a ball valve, and the second control valve is a needle valve; The liquid output pipeline is also connected to an emptying pipeline, and a third control valve, which is a ball valve, is installed on the emptying pipeline. A section of the gas injection pipe is configured as a U-shaped bend to prevent liquid backflow.

[0013] This invention also provides a gas-liquid-solid three-phase porous jet erosion corrosion test method, using the experimental apparatus described above, including the following steps: Step 1. Place the metal sample on the inclined base, place an annular rubber ring on top of the metal sample, and then tighten the rubber ring by connecting the hollow screw to the inclined base to fix the metal sample on the inclined base. Step 2. Place the inclined base with the metal sample installed on it on the support platform, cover it with the top cover and fix it, and close the gas storage bottle; Step 3. Open the first control valve and inject the pre-prepared sand-containing liquid into the jet chamber through the main jet pipe from the sand-collecting cylinder. Stop injecting the sand-containing liquid when the liquid level is level with the first control valve and close the first control valve. Step 4. Turn on the centrifugal pump and air compressor, adjust the liquid phase flow rate through the frequency converter and electromagnetic flow meter, control the gas phase flow rate through the second control valve and gas flow meter, open the vent valve, and start the unpressurized gas-liquid-solid jet experiment after the flow rate stabilizes; during the experiment, control the jet temperature ejected from the nozzle through the cooling system. Step 5. After the experiment, open the top cover of the jet chamber and obtain the test sample.

[0014] A gas-liquid-solid three-phase porous jet erosion corrosion test method, using the experimental apparatus described above, includes the following steps: Step 1. Place the metal sample on the inclined base, place a rubber ring on top of the metal sample, and then tighten the rubber ring by connecting the hollow screw to the inclined base to fix the metal sample on the inclined base. Step 2. Place the inclined base with the metal sample installed on it on the support platform, cover it with the top cover and fix it in place; Step 3. Close the first control valve and fill the sand-collecting cylinder with gravel; Step 4. Open the vent valve on the top cover of the air compressor and jet chamber, control the air volume through the second control valve, and balance the internal and external pressure through the vent valve; Step 5. Slowly open the first control valve to reach the required sand mass flow rate before starting the gas-solid erosion experiment. If the sand volume is less than 1 / 3 of the sand-collecting cylinder, sand needs to be added. Step 6. After the experiment, open the top cover of the jet chamber and obtain the test sample.

[0015] A gas-liquid-solid three-phase porous jet erosion corrosion test method, using the experimental apparatus described above, includes the following steps: Step 1. Place the metal sample on the inclined base, place an annular rubber ring on top of the metal sample, and then tighten the rubber ring by connecting the hollow screw to the inclined base to fix the metal sample on the inclined base. Step 2. Place the inclined base with the metal sample installed on it onto the support platform, cover it with the top cover and fix it in place; Step 3. Open the first control valve and add the pre-prepared sand-containing liquid into the jet chamber through the main jet pipe from the sand-collecting cylinder. Stop adding the sand-containing liquid when the liquid level is level with the first control valve and close the first control valve. If a pressurized test is to be performed, connect the gas injection port of the top cover to the gas storage bottle for pressurization. If the test is not pressurized, close the gas storage bottle. Step 4. Turn on the centrifugal pump and turn off the air compressor. Adjust the liquid flow rate using the frequency converter and electromagnetic flow meter. Once the flow rate stabilizes, begin the pressurized or unpressurized liquid-solid jet experiment. During the experiment, control the jet temperature ejected from the nozzle using the cooling system. Step 5. After the experiment, open the top cover of the jet chamber and obtain the test sample.

[0016] The beneficial technical effects of the present invention are as follows: (1) The present invention provides a gas-liquid-solid three-phase porous jet erosion corrosion experimental device and experimental method. The experimental device can perform gas-liquid-solid three-phase jet experiments in the field of erosion corrosion. Of course, it can also perform gas-solid, liquid-solid and other jet experiments. When performing gas-liquid-solid three-phase jet and liquid-solid jet experiments, it can also provide a pressurized environment to perform pressurized / unpressurized test tests respectively, and has a wider range of practical functions.

[0017] (2) This invention allows for the simultaneous execution of multiple parallel experiments within one experimental cycle, which greatly shortens the experimental cycle and reduces material consumption. Moreover, this invention enables the adjustment of the jet diameter by changing the nozzle and the adjustment of the impact angle of the metal sample by changing the inclined base with different inclination angles of the supporting device, which greatly enhances the degree of experimental freedom.

[0018] (3) The present invention uses a jacketed cooling water circulation cooling method for efficient cooling treatment, and can control the cooling water flow rate through a cooling water machine, so that the jet temperature is adjustable, which can effectively solve the problem of temperature rise caused by throttling effect during jet experiment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structural principle of the gas-liquid-solid three-phase porous jet erosion corrosion experimental device of the present invention; Figure 2 This is a cross-sectional schematic diagram of the gas-liquid-solid three-phase porous jet erosion corrosion experimental device of the present invention; Figure 3 This is a schematic cross-sectional view of the jet chamber in the experimental apparatus of the present invention; Figure 4 This is a schematic diagram of the external structure of the jet chamber in the experimental apparatus of the present invention; Figure 5 This is a schematic diagram of the metal sample mounting structure in the experimental apparatus of the present invention; Figure 6 This is a schematic cross-sectional view of the metal sample mounted on the inclined substrate in the experimental apparatus of the present invention. Figure 7 This is a schematic diagram showing the change of jet angle when using different inclined substrates in the experimental apparatus of the present invention.

[0020] In the diagram, 1-jet chamber, 2-metal sample, 3-top cover, 4-jet main pipe, 5-nozzle, 6-liquid input pipe, 7-electromagnetic flow meter, 8-liquid output pipe, 9-centrifugal pump, 10-sand measuring cylinder, 11-third control valve, 12-first control valve, 13-air compressor, 14-gas injection pipe, 15-gas flow meter, 16-second control valve, 17-copper conductor, 18-working electrode, 19-counter electrode, 20-reference electrode, 21-cooling water machine, 22-outlet pipe, 23-return pipe, 24-sleeve, 25-inclined base, 26-support platform, 27-annular threaded groove, 28-hollow screw, 29-annular rubber ring, 30-frequency converter, 31-gas injection pipe, 32-gas storage cylinder, 33-pressure sensor, 34-temperature sensor, 35-relief valve, 36-U-shaped bend. Detailed Implementation

[0021] Currently, most experimental apparatuses for erosion corrosion can only perform single-phase or two-phase flow experiments, and cannot simultaneously handle three-phase flow experiments involving gas, liquid, and solid phases. Furthermore, the temperature during the experiment is uncontrollable, easily leading to excessively high jet temperatures. In addition, since testing metal samples requires multiple characterization tests, for long-term experiments, obtaining samples under identical testing conditions necessitates multiple experiments, significantly increasing experimental time and costs. To address this, the experimental apparatus of this invention is equipped with multiple identical injection ports, allowing simultaneous testing of multiple samples under a single set of conditions, and concurrent characterization tests after the experiment. This apparatus can meet various experimental testing requirements, such as gas-solid, gas-liquid, liquid-solid, and gas-liquid-solid multiphase flow erosion corrosion experiments, satisfying diverse testing conditions while greatly reducing experimental time and resource costs.

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 As shown, a gas-liquid-solid three-phase porous jet erosion corrosion experimental device includes a jet system, a sand feeding system, a gas injection system, and a cooling system. The jet system includes a jet chamber 1, inside which is a support device for mounting the metal sample 2 to be tested. A top cover 3 is installed at the top of the jet chamber 1, tightly connected to the jet chamber 1 with screws, and a rubber gasket is sandwiched between them to seal the internal space of the jet chamber 1. A main jet pipe 4 passes through the top cover 3, and a nozzle 5 is connected to the end of the main jet pipe 4, with the outlet center of the nozzle 5 facing the center of the surface of the metal sample 2. The main jet pipe 4 is also connected to a liquid input pipe 6, on which an electromagnetic flowmeter 7 is installed. A liquid output pipe 8 is connected to the bottom of the jet chamber 1, and the liquid output pipe 8 is connected to the liquid input pipe 6 via a centrifugal pump 9. The centrifugal pump 9 is connected to a frequency converter 30.

[0024] The sand-addition system includes a sand-collecting cylinder 10 with volume markings for easy calculation of the sand mass flow rate. A cover plate is installed at the top of the sand-collecting cylinder 10, which can be manually opened and closed. During the experiment, the top cover plate must be closed to prevent the gas flow from flushing out fine sand. The bottom outlet of the sand-collecting cylinder 10 is connected to the top of the main jet pipe 4, and a first control valve 12 is installed at the bottom outlet of the sand-collecting cylinder 10. The sand flow rate in the sand-collecting cylinder can be controlled by adjusting the opening of the first control valve 12.

[0025] The gas injection system includes an air compressor 13 and a gas injection pipe 14. The outlet of the air compressor 13 is connected to one end of the gas injection pipe 14, and the other end of the gas injection pipe 14 is connected to a liquid input pipe 6. A gas flow meter 15 and a second control valve 16 are installed on the gas injection pipe 14. The gas flow rate can be adjusted by the second control valve 16. The outlet of the gas injection pipe 14 is inserted into the top surface of the liquid input pipe 6.

[0026] The metal sample 2 is also connected to a copper conductor 17 to form a working electrode 18. A counter electrode 19 and a reference electrode 20 are also provided in the jet chamber 1. The working electrode 18, counter electrode 19, and reference electrode 20 are all connected to an electrochemical workstation for electrochemical monitoring. The working electrode 18, counter electrode 19, and reference electrode 20 are all fixed to the top cover 3. All components are sealed to the top cover using screws and rubber rings, and are all removable and replaceable.

[0027] The cooling system includes a coolant cooler 21, an outlet pipe 22, a return pipe 23, and a sleeve 24. The sleeve 24 is fitted over the liquid output pipe 8 and the liquid input pipe 6, and the space between the sleeve 24 and the liquid output pipe 8 and the liquid input pipe 6 forms a cooling water flow channel. The outlet of the coolant cooler 21 is connected to one end of the sleeve 24 via the outlet pipe 22, and the other end of the sleeve 24 is connected to the return port of the coolant cooler 21 via the return pipe 23. Figure 1 , Figure 2 As shown, the cooling water inlet of the casing is located at a lower horizontal position, while the cooling water outlet is located at a higher horizontal position. The cooling water inlet is situated at the lower horizontal position throughout the entire loop, facilitating the filling of the casing jacket with cooling water. The cooling water exchanges heat with the jet fluid through the metal walls of the liquid inlet and liquid outlet pipes, never directly contacting them. The cooling water flow rate and temperature can be adjusted by the cooling water compressor 21, thereby regulating the jet fluid temperature.

[0028] As a further design of the present invention, such as Figure 5 , Figure 6As shown, the supporting device includes an inclined base 25 and a support platform 26, with the inclined base 25 disposed on the support platform 26. One side of the inclined base is inclined, forming an inclined surface, and an annular threaded groove 27 is formed on this inclined surface, which mates with a hollow screw 28. The metal sample is circular and is placed on the inclined surface of the inclined base 25, inside the annular threaded groove 27. When the hollow screw 28 is screwed into the annular threaded groove 27, it presses the metal sample to be tested, fixing it on the inclined base 25. Specifically, the hollow screw 28 includes a nut and a threaded section, one end of which is integrally connected to the nut. A through hole is provided at the center of the nut and the threaded section, and an inner edge is provided around the nut corresponding to the through hole. The external thread on the threaded section matches the internal thread groove on the annular threaded groove. When the hollow screw is screwed into the annular threaded groove, the threaded section is screwed into the annular threaded groove, and the inner edge of the nut presses against the edge of the metal sample to be tested, leaving the sample exposed directly opposite the through hole. An annular rubber ring 29 is placed between the inner edge of the nut and the sample to be tested. That is, the annular rubber ring 29 is installed between the hollow screw 28 and the surface of the metal sample to be tested. Through the threaded engagement between the hollow screw 28 and the inclined base 25, the hollow screw and the inclined base compress the annular rubber ring 29 and the metal sample to form a mechanical seal. During the experiment, only the exposed metal sample to be tested comes into contact with the liquid environment.

[0029] The front section of the aforementioned copper conductor 17 is covered by an inclined substrate 25, with only the first end exposed. The first end contacts the metal sample, and the tail end is connected to the working electrode of the electrochemical workstation. An insulating layer is provided on the outside of the section of the copper conductor 17 located in the jet chamber 1, i.e., it is insulated and wrapped with materials such as polyethylene plastic. Both the inclined substrate 25 and the hollow screw 28 are made of high-density polyethylene material. After assembling the working electrode, the red and black probes of a multimeter can be used to point to the surface of the metal sample and the copper conductor at the other end of the working electrode, respectively, to determine whether there is continuity. If there is no continuity, the working electrode needs to be readjusted and reassembled.

[0030] Furthermore, multiple supporting devices are arranged around the main jet pipe 4 inside the jet chamber 1, with the main jet pipe 4 arranged vertically. Multiple nozzles 5 are also correspondingly arranged, spaced apart around the bottom outlet of the main jet pipe, with the center of each nozzle outlet directly facing the center of the surface of the metal sample to be tested on one of the supporting devices. Figure 2 , Figure 3 As shown, four nozzles are set up, equivalent to four identical injection ports, allowing for simultaneous testing of four metal samples under one set of operating conditions, and concurrent characterization tests after the experiment. The main jet pipe outlet is connected to the nozzles via a threaded structure. The nozzles are freely detachable components, allowing for replacement with nozzles of different jet diameters as needed.

[0031] For four metal samples to be tested, two can be allocated for electrochemistry, meaning two corresponding working electrodes need to be set up, such as... Figure 4 As shown. One sample is used for weightlessness testing, and the other for microscopic characterization. The samples used for both weightlessness testing and microscopic characterization only require a fixed tilt angle.

[0032] Furthermore, such as Figure 4 As shown, the top cover of the jet chamber 1 is provided with an air injection port, which is connected to a gas storage cylinder 32 via an air injection pipe 31 for pressurizing the air inside the jet chamber 1. The air injection pipe 31 is inserted into the jet chamber 1 through the air injection port. A pressure sensor 33, a temperature sensor 34, and a relief valve 35 are also provided on the top cover 3 of the jet chamber for monitoring the pressure and temperature inside the jet chamber 1 and for depressurizing when necessary. The pressure sensor 33, relief valve 35, and other components on the top cover of the jet chamber are all tightly integrated with the top cover, so that the jet chamber with the top cover forms a sealed chamber.

[0033] Furthermore, the liquid output pipe 8 is also connected to an vent pipe, on which a third control valve 11 is installed. A section of the gas injection pipe 14 is configured as a U-shaped bend 36 to prevent liquid backflow into the air compressor 13. Moreover, the U-shaped bend 36 can be further configured such that the vertical height of the end near the air compressor 13 is higher than that of the other end.

[0034] Both the first control valve 12 and the third control valve 11 are ball valves. The second control valve 16 is a needle valve; the needle valve was chosen because it offers higher precision in regulating gas flow.

[0035] The gas flow meter 15 mentioned above is used to monitor the gas flow rate in the pipeline, and the flow velocity can be obtained from the flow rate according to the following formula; Where v is the flow velocity in m / s and Q is the flow rate in m³ / s. 3 / s, is a constant, which can be approximated as 3.14, and r is the inner diameter radius of the pipe, in meters.

[0036] The device of this invention can simulate various multiphase jet experiments, including gas-liquid-solid jets, gas-solid jets, and liquid-solid jets (pressurized / unpressurized).

[0037] Specifically, a gas-liquid-solid three-phase porous jet erosion corrosion test method, using the experimental apparatus described above, includes the following steps: Step 1. Place the metal sample 2 on the inclined base 25, place the annular rubber ring 29 above the metal sample, and then use the hollow screw 28 to connect the threaded connection of the rubber ring to the inclined base to fix the metal sample on the inclined base.

[0038] Step 2. Place the inclined base with the metal sample installed on the support platform 26, cover it with the top cover 3 and fix it, and close the gas storage bottle 32.

[0039] Step 3. Open the first control valve 12, and add the pre-prepared sand-containing liquid into the jet chamber through the main jet pipe from the sand-collecting cylinder 10. Stop adding the sand-containing liquid when the liquid level is level with the first control valve, and close the first control valve.

[0040] Step 4. Turn on the centrifugal pump 9 and air compressor 13, adjust the liquid phase flow rate through the frequency converter and electromagnetic flow meter 7, control the gas phase flow rate through the second control valve 16 and gas flow meter 15, open the vent valve 35, and start the unpressurized gas-liquid-solid jet experiment after the flow rate stabilizes; during the experiment, control the jet temperature ejected from the nozzle through the cooling system.

[0041] Step 5. After the experiment, open the top cover of the jet chamber and obtain the test sample.

[0042] A gas-solid two-phase porous jet erosion corrosion test method, using the experimental apparatus described above, includes the following steps: Step 1. Place the metal sample on the inclined base, place an annular rubber ring on top of the metal sample, and then tighten the rubber ring by connecting the hollow screw to the inclined base to fix the metal sample on the inclined base.

[0043] Step 2. Place the inclined base with the metal sample installed on it on the support platform, cover it with the top cover and fix it.

[0044] Step 3. Close the first control valve and fill the sand-collecting cylinder with gravel.

[0045] Step 4. Open the vent valve on the top cover of the air compressor and jet chamber, control the air volume through the second control valve, and balance the internal and external pressure through the vent valve.

[0046] Step 5. Slowly open the first control valve to reach the required sand mass flow rate before starting the gas-solid erosion experiment. If the amount of sand in the measuring cylinder is less than 1 / 3, sand needs to be added.

[0047] Step 6. After the experiment, open the top cover of the jet chamber and obtain the test sample.

[0048] A liquid-solid two-phase porous jet erosion corrosion test method, using the test apparatus described above, includes the following steps: Step 1. Place the metal sample on the inclined base, place an annular rubber ring on top of the metal sample, and then tighten the rubber ring by connecting the hollow screw to the inclined base to fix the metal sample on the inclined base.

[0049] Step 2. Place the inclined base with the metal sample installed on the support platform, cover it with the top cover and fix it.

[0050] Step 3. Open the first control valve and add the pre-prepared sand-containing liquid into the jet chamber through the main jet pipe from the sand-collecting cylinder. Stop adding the sand-containing liquid when the liquid level is level with the first control valve and close the first control valve. If a pressurized test is to be performed, connect the gas injection port of the top cover to the gas storage bottle for pressurization. If the test is not pressurized, close the gas storage bottle.

[0051] Step 4. Turn on the centrifugal pump and turn off the air compressor. Adjust the liquid flow rate through the frequency converter and electromagnetic flow meter. After the flow rate stabilizes, start the pressurized or unpressurized liquid-solid jet experiment. During the experiment, control the jet temperature ejected from the nozzle through the cooling system.

[0052] Step 5. After the experiment, open the top cover of the jet chamber and obtain the test sample.

[0053] This invention allows for the simultaneous execution of multiple parallel experiments within a single experimental cycle, significantly shortening the experimental period and reducing material waste. Furthermore, this invention enables the adjustment of the jet diameter by changing the nozzle and by replacing the inclined base with different tilt angles of the supporting device, such as... Figure 7 As shown, adjusting the impact angle of the metal sample greatly enhances the degree of freedom in the experiment.

[0054] For any parts not mentioned above, existing technologies can be adopted or referenced.

[0055] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A gas-liquid-solid three-phase porous jet erosion corrosion experimental apparatus, characterized in that: This includes a jetting system, a sand-addition system, and a gas injection system; The jet system includes a jet chamber, inside which is a support device for mounting the test sample; a top cover is installed at the top of the jet chamber, through which a main jet pipe passes, and the end of the main jet pipe is connected to a nozzle, with the nozzle outlet center facing the center of the surface of the test sample. The main jet pipe is also connected to the liquid input pipe, and the bottom of the jet chamber is connected to the liquid output pipe. The liquid output pipe is connected to the liquid input pipe through a centrifugal pump. The sand adding system includes a sand-collecting cylinder with volume markings and an openable cover plate at the top. The bottom outlet of the sand-collecting cylinder is connected to the top of the jet main pipe, and a first control valve is installed at the bottom outlet of the sand-collecting cylinder. The gas injection system includes an air compressor and a gas injection pipeline. The outlet of the air compressor is connected to one end of the gas injection pipeline, and the other end of the gas injection pipeline is connected to a liquid input pipeline. A gas flow meter and a second control valve are installed on the gas injection pipeline. The test sample is also connected to a conductor to form a working electrode. A counter electrode and a reference electrode are also provided in the jet chamber. The working electrode, counter electrode, and reference electrode are all fixed on the top cover.

2. The gas-liquid-solid three-phase porous jet erosion corrosion experimental device according to claim 1, characterized in that: The supporting device includes an inclined base and a supporting platform, with the inclined base set on the supporting platform; one side of the inclined base is inclined and is an inclined surface, and an annular threaded groove is formed on the inclined surface, which cooperates with a hollow screw. The test sample is circular and placed on the inclined surface of the inclined base, inside the annular thread groove. When the hollow screw is screwed into the annular thread groove, it presses the test sample and fixes it on the inclined base.

3. The gas-liquid-solid three-phase porous jet erosion corrosion experimental device according to claim 2, characterized in that: The hollow screw includes a nut and a threaded section. One end of the threaded section is integrally connected to the nut. A through hole is provided in the center of the nut and the threaded section. An inner edge is also provided around the nut corresponding to the through hole. The external thread on the threaded section is adapted to the internal thread groove on the annular thread groove. When the hollow screw is screwed into the annular thread groove, the threaded section is screwed into the annular thread groove, the inner edge of the nut presses against the edge of the test sample, and the position of the test sample facing the through hole is exposed. An annular rubber ring is provided between the inner edge of the nut and the test sample; The conductor is a copper conductor; the inclined base and the hollow screw are both made of polyethylene material.

4. The gas-liquid-solid three-phase porous jet erosion corrosion experimental device according to claim 1, characterized in that: Multiple support devices are provided and arranged around the main jet pipe inside the jet chamber, with the main jet pipe arranged vertically. Multiple nozzles are also provided, with multiple nozzles arranged at intervals around the bottom outlet of the main jet pipe, and the center of the outlet of each nozzle is directly opposite the center of the surface of the sample to be tested on one of the support devices.

5. The gas-liquid-solid three-phase porous jet erosion corrosion experimental device according to claim 1, characterized in that: The top cover of the jet chamber is provided with an air injection port, which is connected to a gas storage cylinder through an air injection pipe; Pressure sensors, temperature sensors, and a relief valve are also installed on the top cover of the jet chamber.

6. The gas-liquid-solid three-phase porous jet erosion corrosion experimental apparatus according to claim 1, characterized in that: The device also includes a cooling system, which includes a cooling water machine, an outlet pipe, a return pipe, and a sleeve. The sleeve is fitted over the outside of the liquid output pipe and the liquid input pipe, and the interlayer between the sleeve and the liquid output pipe and the liquid input pipe respectively forms a cooling water flow channel. The outlet of the cooling water machine is connected to one end of the sleeve through the outlet pipe, and the other end of the sleeve is connected to the return port of the cooling water machine through the return pipe.

7. The gas-liquid-solid three-phase porous jet erosion corrosion experimental device according to claim 1, characterized in that: An electromagnetic flow meter is also installed on the liquid input pipeline; the centrifugal pump is also connected to a frequency converter; The test sample is a metal sample; The first control valve is a ball valve, and the second control valve is a needle valve; The liquid output pipeline is also connected to an emptying pipeline, and a third control valve, which is a ball valve, is installed on the emptying pipeline. A section of the gas injection pipe is configured as a U-shaped bend to prevent liquid backflow.

8. A gas-liquid-solid three-phase porous jet erosion corrosion test method, using the test apparatus as described in any one of claims 1-7, characterized in that... Includes the following steps: Step 1. Place the metal sample on the inclined base, place an annular rubber ring on top of the metal sample, and then tighten the rubber ring by connecting the hollow screw to the inclined base to fix the metal sample on the inclined base. Step 2. Place the inclined base with the metal sample installed on it on the support platform, cover it with the top cover and fix it, and close the gas storage bottle; Step 3. Open the first control valve and inject the pre-prepared sand-containing liquid into the jet chamber through the main jet pipe from the sand-collecting cylinder. Stop injecting the sand-containing liquid when the liquid level is level with the first control valve and close the first control valve. Step 4. Turn on the centrifugal pump and air compressor, adjust the liquid phase flow rate through the frequency converter and electromagnetic flow meter, control the gas phase flow rate through the second control valve and gas flow meter, open the vent valve, and start the unpressurized gas-liquid-solid jet experiment after the flow rate stabilizes; during the experiment, control the jet temperature ejected from the nozzle through the cooling system. Step 5. After the experiment, open the top cover of the jet chamber and obtain the test sample.

9. A gas-liquid-solid three-phase porous jet erosion corrosion test method, using the test apparatus as described in any one of claims 1-7, characterized in that... Includes the following steps: Step 1. Place the metal sample on the inclined base, place a rubber ring on top of the metal sample, and then tighten the rubber ring by connecting the hollow screw to the inclined base to fix the metal sample on the inclined base. Step 2. Place the inclined base with the metal sample installed on it on the support platform, cover it with the top cover and fix it in place; Step 3. Close the first control valve and fill the sand-collecting cylinder with gravel; Step 4. Open the vent valve on the top cover of the air compressor and jet chamber, control the air volume through the second control valve, and balance the internal and external pressure through the vent valve; Step 5. Slowly open the first control valve to reach the required sand mass flow rate before starting the gas-solid erosion experiment. If the sand volume is less than 1 / 3 of the sand-collecting cylinder, sand needs to be added. Step 6. After the experiment, open the top cover of the jet chamber and obtain the test sample.

10. A gas-liquid-solid three-phase porous jet erosion corrosion test method, using the test apparatus as described in any one of claims 1-7, characterized in that... Includes the following steps: Step 1. Place the metal sample on the inclined base, place an annular rubber ring on top of the metal sample, and then tighten the rubber ring by connecting the hollow screw to the inclined base to fix the metal sample on the inclined base. Step 2. Place the inclined base with the metal sample installed on it onto the support platform, cover it with the top cover and fix it in place; Step 3. Open the first control valve and add the pre-prepared sand-containing liquid into the jet chamber through the main jet pipe from the sand-collecting cylinder. Stop adding the sand-containing liquid when the liquid level is level with the first control valve and close the first control valve. If a pressurized test is to be performed, connect the gas injection port of the top cover to the gas storage bottle for pressurization. If the test is not pressurized, close the gas storage bottle. Step 4. Turn on the centrifugal pump and turn off the air compressor. Adjust the liquid flow rate using the frequency converter and electromagnetic flow meter. Once the flow rate stabilizes, begin the pressurized or unpressurized liquid-solid jet experiment. During the experiment, control the jet temperature ejected from the nozzle using the cooling system. Step 5. After the experiment, open the top cover of the jet chamber and obtain the test sample.

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