CN112326486A - Pipe flow type experimental device for simulating axial erosion corrosion of inner wall of pipeline - Google Patents
Pipe flow type experimental device for simulating axial erosion corrosion of inner wall of pipeline Download PDFInfo
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Abstract
The invention relates to the field of erosion corrosion devices, in particular to a pipe flow type experimental device for simulating axial erosion corrosion of an inner wall of a pipeline. The device is provided with an experiment loop part, a cooling loop part and a test system, wherein an electrochemical test pipe section of the experiment loop part is distributed on the upper side and the lower side of a weightlessness test pipe section, a sample of the electrochemical test pipe section is a circular curved surface-shaped sample cut from a pipe to be tested, is fixed on the inner wall of the test pipe section through a special sealing insulating clamp and is connected with the test system through a lead; the samples of the weightlessness test pipe section are a plurality of short tubular samples cut from the pipe to be tested, and are mutually separated by special insulating gaskets and fixed inside the test pipe section. The invention researches the axial erosion corrosion behavior of the inner wall of the pipeline under the condition of truly simulating the working condition of the actual pipe flow, can accurately control the test parameters such as temperature, flow rate and the like and simulate the initial soaking environment of the pipeline and the like, and realizes the online electrochemical monitoring and the weightlessness test of a plurality of same or different tubular samples.
Description
Technical Field
The invention relates to the field of erosion corrosion devices, in particular to a pipe flow type experimental device for simulating axial erosion corrosion of an inner wall of a pipeline.
Background
In the prior art, the erosion corrosion experimental device has three types: rotary, jet, pipe flow, wherein: the rotary device enables a sample to be corroded or abraded based on tangential force generated by relative motion between the sample and liquid, but the linear velocity of a stirring wheel used by rotary equipment is different from the relative velocity between the sample and the solution, the actual relative velocity is not easy to accurately control, the experimental surface of the sample is often the outer surface of a plane or tubular sample, the actual erosion corrosion condition of the inner wall of a pipeline cannot be simulated, and the processing state and the stress state of the surface of the plane sample are different from those of the tubular sample; the jet flow type experimental device is based on a structure that a circulating pump and a nozzle generate a high-speed flowing medium to impact a sample, can accurately control the flow velocity of impact liquid flow and change the attack angle of scouring, but a sample test surface is always a plane, the scouring strength is larger than the actual condition, a certain difference exists between the actual scouring corrosion conditions of the pump and a pipeline, and the diameter of the nozzle can be changed due to the scouring effect; the tubular flow device is based on liquid flow/pipeline static formula structure, can simulate the axial erosion and corrosion action of fluid along the pipeline inner wall better, and is the same with actual tubular flow operating mode condition, but traditional tubular flow device is bulky, and the construction running cost is high, and the system is unstable, and the experimental period is long, and the electrochemistry test and the weightlessness test of a plurality of samples can not go on simultaneously.
Disclosure of Invention
The invention aims to provide a pipe flow type experimental device for simulating axial erosion corrosion of an inner wall of a pipeline, and solves the problems that the existing pipe flow type erosion corrosion experimental device cannot simultaneously carry out electrochemical test and weightlessness test, has large experimental cost, and a rotary type and jet type device cannot accurately simulate actual pipe flow working conditions.
The technical scheme of the invention is as follows:
the utility model provides a pipe flow formula experimental apparatus of simulation pipeline inner wall axial scour corrosion, the device has experiment loop portion, cooling circuit portion, test system, the immersible pump delivery port links to each other with experiment loop portion entry end through plastic hose I, the electrochemistry test tube section of experiment loop portion distributes in the upper and lower both sides of weightlessness test tube section, the sample of electrochemistry test tube section passes through the wire and links to each other with test system, experiment loop portion exit end submergence is in cistern liquid level below, horizontal tubing pump water inlet of cooling circuit portion stretches into the cistern bottom through stainless steel braided tube, horizontal tubing pump delivery port passes through plastic hose II and links to each other with the cooler water inlet, the one end of plastic hose III is connected to the cooler delivery port, the other end submergence of plastic hose III is in cistern liquid level below.
The pipe flow type experimental device for simulating axial erosion corrosion of the inner wall of the pipeline is characterized in that an experimental loop part is provided with a water storage tank, a submersible pump, a plastic hose I, an electromagnetic flow meter, an electrochemical test pipe section I, an electrochemical test pipe section II, an electrochemical test pipe section III, an electrochemical test pipe section IV and a weightlessness test pipe section, the submersible pump is arranged at the bottom in the water storage tank, a water outlet of the submersible pump is connected with one end of the plastic hose I through a stainless steel conical pipe, and the other end of the plastic hose I is connected with an inlet end of the experimental; an electromagnetic flowmeter, an electrochemical test pipe section IV, an electrochemical test pipe section III, a weightlessness test pipe section, an electrochemical test pipe section II and an electrochemical test pipe section I are sequentially arranged in an ascending pipeline of the experimental loop part from bottom to top, the electromagnetic flowmeter is fixed on a pipeline bracket through a lifting device, and two ends of the electromagnetic flowmeter are communicated with the pipeline on the experimental loop through flange plates welded with buckles.
Simulation pipeline inner wall axial scour corrosion's pipe flow experimental apparatus, be located the pipeline section that is linked together between electromagnetic flowmeter and the plastic hose I and install valve II, and set up one section vertical bypass on the pipeline section, the lower port of bypass extends to the top in the cistern, install valve I on the bypass.
According to the pipe flow type experimental device for simulating axial erosion corrosion of the inner wall of the pipeline, a valve V is installed in a descending pipeline of an experimental loop part, a section of vertical bypass is arranged on the descending pipeline, a lower port of the bypass is positioned above a reservoir, and a valve IV is installed on the bypass; the lower port of the descending pipeline of the experiment loop part is the outlet end of the experiment loop part, and the outlet end of the experiment loop part is immersed below the liquid level of the reservoir.
The pipe flow type experimental device for simulating axial erosion corrosion of the inner wall of the pipeline is characterized in that an ascending pipeline of an experimental loop part and a descending pipeline of the experimental loop part are parallel to each other, an upper port of the ascending pipeline is communicated with an upper port of the descending pipeline through a horizontal pipeline, a horizontal bypass is arranged on the horizontal pipeline, one end of the bypass is opened, and a valve III is installed on the bypass.
Simulation pipeline inner wall axial erosion corrosion's pipe flow formula experimental apparatus, the pipeline of experiment return circuit part passes through the pipeline support fixed, passes through the buckle between the adjacent pipe section of experiment return circuit part fixed, passes through rubber seal waterproof sealing between the adjacent pipe section of experiment return circuit part, the pipeline inner wall of experiment return circuit part is through rust-resistant processing.
The pipe flow type experimental device for simulating the axial erosion corrosion of the inner wall of the pipeline is characterized in that an electrochemical test pipe section I, an electrochemical test pipe section II, an electrochemical test pipe section III and an electrochemical test pipe section IV are all of a five-way structure, and the five-way structure comprises: hold in the palm, the adjusting washer, holds in the palm in the electrode, wire, rubber seal I, rubber seal II, rubber seal III, screw thread pressure cap, reference electrode, rubber seal IV, reference electrode support outside compressing tightly solenoid, gland nut, quick interface, buckle, five-way pipeline, counter electrode sample, working electrode sample, electrode, concrete structure as follows:
the electrode outer supports are symmetrically inserted into a group of opposite two-way inner cavities of the five-way pipeline, a counter electrode sample and a working electrode sample are respectively arranged in the inner cavity of one electrode outer support, the counter electrode sample and the working electrode sample are oppositely arranged, an electrode inner support is inserted into the inner cavity of each electrode outer support, the back sides of the counter electrode sample and the working electrode sample are respectively connected with one lead, each lead penetrates through a central hole of the electrode inner support to extend out, and the extending end of each lead is connected with a test system; a rubber sealing ring II is arranged between the electrode outer support and the contact surface of one group of two opposite outer end surfaces of the five-way pipeline, and a rubber sealing ring I is arranged between the electrode inner support and the contact surface of the outer end surface of the electrode outer support;
the quick connector, the compression nut and the compression screw pipe are sequentially and symmetrically arranged at one group of opposite two ends of the five-way pipeline, the quick connector and the five-way pipeline are fixed through a buckle I, the quick connector and the opposite end faces of the five-way pipeline are sealed through rubber sealing rings, internal threads are arranged on the wall face of an inner cavity of the quick connector, the compression nut is connected with the wall face of the inner cavity of the quick connector through threads, the end face of the compression nut, which is positioned in the inner cavity of the quick connector, corresponds to the outer end face of the outer electrode holder, and an adjusting gasket is arranged between the end face in the inner cavity of the quick connector and the outer; an internal thread is arranged on the inner wall surface of a central hole of the compression nut, a compression solenoid is arranged in the central hole of the compression nut in a penetrating way and is connected with the inner wall surface of the central hole of the compression nut through a thread, one end of the compression solenoid corresponds to the outer end surface of the electrode inner support, and the electrode inner support is compressed and fixed through the compression solenoid;
the other group of opposite two-way end parts of the five-way pipeline are connected into the pipeline of the experimental loop part through a buckle; the outer thread is arranged at the end part of a fifth through vertically arranged on the five-way pipeline, the thread pressing cap is connected with the end part of the fifth through threads, the inner cavity of the fifth through is provided with a reference electrode support, a rubber sealing ring IV is arranged between the thread pressing cap and the reference electrode support, and one end of the reference electrode penetrates through the thread pressing cap to extend into the inner cavity of the fifth through.
The pipe flow type experimental device for simulating axial erosion corrosion of the inner wall of the pipeline is characterized in that a weightlessness test pipe section comprises a conversion head, a buckle II, a weightlessness pipeline, a weightlessness sample gasket and a rubber seal ring V, and the pipe flow type experimental device has the following specific structure:
weightless samples are uniformly distributed in the weightless pipeline, adjacent weightless samples are insulated and separated through weightless sample gaskets, the weightless samples are clamped with the adjacent weightless sample gaskets, two ends of the weightless pipeline are respectively connected with one end of an adapter through a buckle II and sealed through a rubber sealing ring V, and the other end of each adapter is connected into a pipeline of the experimental loop part.
Simulation pipeline inner wall axial scour corrosion's pipe flow experimental apparatus, be equipped with horizontal tubing pump at the cooling circuit part, the cooler, plastic hose II, the pipe is woven to the stainless steel, plastic hose III, the one end that the pipe was woven to the stainless steel is connected to horizontal tubing pump's water inlet, the other end that the pipe was woven to the stainless steel stretches into the cistern bottom, the one end of plastic hose II is connected to horizontal tubing pump's delivery port, the experimental solution entry end of cooler is connected to plastic hose II's the other end, the experimental solution exit end of cooler passes through in the plastic hose III inserts the cistern.
The pipe flow type experimental device for simulating the axial erosion corrosion of the inner wall of the pipeline is provided with an inlet and an outlet of a cooling solution on a cooler, so that the cooler is communicated with the external cooling solution.
The design idea of the invention is as follows:
the invention is based on the practical engineering problems: in the pipeline conveying system and the pipe flow type cooling system, the conveyed fluid medium can generate scouring and corrosion effects on the pipeline, so that the pipeline is corroded, perforated and leaked, the whole conveying system and equipment are stopped, and life and property losses are caused.
In order to avoid the corrosion perforation leakage phenomenon of the pipeline, the erosion corrosion behavior of the corresponding material under the corresponding medium needs to be simulated through experiments, so that the corrosion rule of the corresponding material under the corresponding environment is obtained, and the selection of the material and the establishment of the pipeline maintenance period are guided.
Developing the erosion corrosion test, need corresponding equipment, as background art, a small, the operation is stable, pipe flow formula erosion corrosion device that efficiency of software testing is high need be built to present stage.
In order to meet the requirements of energy conservation and environmental protection, the device is miniaturized and multifunctional as much as possible during design and construction, so that each pipe section is designed in a replaceable modular mode, different pipe sections are connected through buckles, disassembly and assembly are convenient, meanwhile, the corresponding pipe sections can be replaced according to requirements, for example, weightless test pipe sections with different diameters are replaced, the erosion corrosion behaviors of pipes with different specifications can be researched, the common elbow is replaced by the elbow with the array electrode, the erosion corrosion behaviors of the pipe at the elbow part can be researched, and the like.
At present, in order to realize higher test efficiency and better comparability, four electrochemical test pipe sections and a weight loss test pipe section capable of being provided with a plurality of weight loss samples are arranged, and a plurality of different samples can be tested at one time.
At present, in order to simulate the erosion corrosion behavior under more environments, for example: the erosion corrosion under different flow rates is simulated, the environments of dead water soaking and oxygen-enriched soaking are simulated, the valve and the bypass with the valve are arranged between the pipe sections, and the erosion corrosion under different environments can be simulated through the opening and closing angle of the valve and the matching between the valves.
The invention has the following advantages and beneficial effects:
1. the invention adopts a modular design, and each pipe section of the experimental loop can be conveniently disassembled, combined and reconstructed.
2. The test pipe section is provided with a valve, so that the dead water soaking and the oxygen-enriched soaking can be realized by matching with the opening and closing of the control valve and the bypass irrigation and ventilation, and the scouring with different flow rates can be realized by controlling the opening and closing angle of the valve.
3. The invention can simultaneously realize the electrochemical test and the weightlessness test of a plurality of same or different pipe samples, and has higher efficiency than the existing erosion corrosion experimental device.
4. Compared with the traditional pipe flow type experimental device, the invention has small floor area and low operation cost, and compared with the traditional rotary disc type and jet type experimental device, the experimental condition is more in line with the actual pipe flow working condition.
5. The invention can design different types of test pipe sections according to requirements, and realizes the erosion corrosion research of samples with different materials, pipe diameters or elbows.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
FIG. 2 is a schematic view of the structure of an electrochemical test tube segment according to the present invention.
Fig. 3 is a schematic structural view of a weightless test tube segment according to the present invention.
FIG. 4 shows the results of the open circuit potential of a sample after being flushed through the apparatus for various periods of time. In the figure, the abscissa Time represents Time(s), and the ordinate Ecorr represents open circuit potential (V/SCE).
FIG. 5 shows the results of electrochemical impedance spectroscopy of a sample after being stamped on the apparatus for various periods of time. In the figure, the abscissa Zreal represents the real part impedance (Ω), and the ordinate-Zimag represents the imaginary part impedance (Ω).
FIG. 6 shows the open circuit potential results of the same polished sample after the same time at the four electrochemical testing positions of the device. In the figure, the abscissa Time represents Time(s), and the ordinate Ecorr represents open circuit potential (V/SCE).
In the figure: 1. a horizontal pipe pump; 2. a cooler; 3. a pipeline support; 4. a valve I; 5. a submersible pump; 6. a reservoir; 7. a valve II; 8. testing the system; 9. a valve III; 10. an electrochemical test tube section I; 11. electrochemical test tube section II; 12. a weight loss test tube section; 13. electrochemical test tube section III; 14. an electrochemical test tube section IV; 15. a valve IV; 16. a valve V; 17. an electromagnetic flow meter; 18. compressing the solenoid; 19. a compression nut; 20. a quick interface; 21. a buckle I; 22. a five-way pipeline; 23. a counter electrode sample; 24. a working electrode sample; 25. an electrode outer support; 26. an adjusting washer; 27. an electrode inner support; 28. a wire; 29. a rubber sealing ring I; 30. a rubber sealing ring II; 31. a rubber seal ring III; 32. pressing a cap by screw threads; 33. a reference electrode; 34. a rubber seal ring IV; 35. a reference electrode holder; 36. a conversion head; 37. a buckle II; 38. a weightless conduit; 39. a weight loss sample; 40. a weight loss sample gasket; 41. a rubber seal ring V; 42. a plastic hose I; 43. a plastic hose II; 44. a stainless steel braided tube; 45. a plastic hose III.
Detailed Description
As shown in figures 1, 2 and 3, the pipe flow type experimental device for simulating axial erosion corrosion of the inner wall of a pipeline, provided by the invention, is provided with an experimental loop part, the water outlet of the submersible pump is connected with the inlet end of the experimental loop part through a plastic hose I42, the electrochemical test pipe sections of the experimental loop part are distributed on the upper side and the lower side of the weightlessness test pipe section 12, samples of the electrochemical test pipe sections are connected with the test system 8 through leads, the outlet end of the experimental loop part is immersed below the liquid level of the reservoir 6, the water inlet of the horizontal pipe pump 1 of the cooling loop part extends into the bottom of the reservoir 6 through a stainless steel braided pipe 44, the water outlet of the horizontal pipe pump 1 is connected with the water inlet of the cooler 2 through a plastic hose II43, the water outlet of the cooler 2 is connected with one end of a plastic hose III45, and the other end of the plastic hose III45 is immersed below the liquid level. Adopt immersible pump 5 as power, drive the experiment solution in the cistern 6 and get into experiment return circuit part, experiment return circuit part realizes obtaining test data through test system 8 to the erosion and corrosion simulation of sample, adopts horizontal tubing pump 1 as power, drives experiment solution in the cistern 6 and gets into cooling circuit part and cool off.
This pipe flow experimental apparatus mainly includes: the device comprises a horizontal pipeline pump 1, a cooler 2, a pipeline bracket 3, a valve I4, a submersible pump 5, a water storage tank 6, a valve II7, a test system 8, a valve III9, an electrochemical test pipe section I10, an electrochemical test pipe section II11, a weightless test pipe section 12, an electrochemical test pipe section III13, an electrochemical test pipe section IV14, a valve IV15, a valve V16, an electromagnetic flowmeter 17, a compression solenoid 18, a compression nut 19, a quick connector 20 and a buckle I21, the five-way pipeline 22, the counter electrode sample 23, the working electrode sample 24, the electrode outer support 25, the adjusting gasket 26, the electrode inner support 27, the lead 28, the rubber seal ring I29, the rubber seal ring II30, the rubber seal ring III31, the threaded press cap 32, the reference electrode 33, the rubber seal ring IV34, the reference electrode support 35, the conversion head 36, the buckle II37, the weight loss pipeline 38, the weight loss sample 39, the weight loss sample gasket 40, the rubber seal ring V41 and the like, and the specific structure is as follows:
the experimental loop part is provided with a water storage tank 6, a submersible pump 5, a plastic hose I42, an electromagnetic flowmeter 17, an electrochemical test pipe section (an electrochemical test pipe section I10, an electrochemical test pipe section II11, an electrochemical test pipe section III13, an electrochemical test pipe section IV14) and a weightlessness test pipe section 12, wherein the submersible pump 5 is arranged at the bottom in the water storage tank 6, a water outlet of the submersible pump 5 is connected with one end of the plastic hose I42 through a stainless steel conical pipe, the other end of the plastic hose I42 is provided with a stainless steel quick-assembly leather pipe joint, the quick-assembly leather pipe joint and the plastic hose I42 are clamped tightly through a stainless steel pipe hoop, and the quick-assembly leather pipe joint is.
In an ascending pipeline of the experimental loop part, an electromagnetic flowmeter 17, an electrochemical test pipe section IV14, an electrochemical test pipe section III13, a weightlessness test pipe section 12, an electrochemical test pipe section II11 and an electrochemical test pipe section I10 are sequentially arranged from bottom to top, the electromagnetic flowmeter 17 is fixed on the pipeline support 3 through a lifting device, and two ends of the electromagnetic flowmeter 17 are communicated with a pipeline on the experimental loop through flanges welded with buckles. The valve II7 is arranged on a pipe section communicated between the electromagnetic flowmeter 17 and the plastic hose I42, a section of vertical bypass is arranged on the pipe section, a lower port of the bypass extends to the upper part in the reservoir 6, the valve I4 is arranged on the bypass, the valve I4 is used for shunting, and the flow rate of the experimental main loop can be changed by adjusting the opening and closing angle in cooperation with the valve II 7.
Install valve V16 in the downstream pipeline of experiment return circuit part to set up one section vertical bypass on the downstream pipeline, the lower port of bypass is located the top of cistern 6, install valve IV15 on the bypass, the effect of valve IV15 is that the stagnant water soaks and oxygen boosting soaks the water injection stage and opens, guarantees that the pipeline is unblocked. The lower port of the descending pipeline of the experimental loop part is the outlet end of the experimental loop part, and the outlet end of the experimental loop part is immersed below the liquid level of the reservoir 6.
An ascending pipeline of the experiment loop part and a descending pipeline of the experiment loop part are parallel to each other, an upper port of the ascending pipeline is communicated with an upper port of the descending pipeline through a horizontal pipeline, a section of horizontal bypass is arranged on the horizontal pipeline, one end of the bypass is opened, a valve III9 is installed on the bypass, the valve III9 is used for starting water injection and ventilation during simulation of an oxygen-enriched soaking experiment, and water injection is started during a dead water soaking experiment.
In addition, the pipeline of the experiment loop part is fixed through the pipeline support 3, the adjacent pipe sections of the experiment loop part are fixed through the buckles, the adjacent pipe sections of the experiment loop part are sealed in a waterproof mode through the rubber sealing rings, and the inner wall of the pipeline of the experiment loop part is subjected to rust prevention treatment.
The cooling loop part is provided with a horizontal pipeline pump 1, a cooler 2, a plastic hose II43, a stainless steel braided tube 44 and a plastic hose III45, a water inlet of the horizontal pipeline pump 1 is connected with one end of the stainless steel braided tube 44, the other end of the stainless steel braided tube 44 extends into the bottom of the water storage tank 6, a water outlet of the horizontal pipeline pump 1 is connected with one end of the plastic hose II43, the other end of the plastic hose II43 is connected with an experimental solution inlet end of the cooler 2, and an experimental solution outlet end of the cooler 2 is connected into the water storage tank 6 through the plastic hose III 45. Meanwhile, the cooler 2 is provided with an inlet and an outlet of the cooling solution, so that the cooler 2 is communicated with the external cooling solution, the cooling effect is better, and the cooler 2 is not actively cooled and is cooled by the external cooling solution.
As shown in fig. 1 and 2, the electrochemical test tube segment I10, the electrochemical test tube segment II11, the electrochemical test tube segment III13, and the electrochemical test tube segment IV14 are all five-way structures, and the five-way structures include: the device comprises a compression solenoid 18, a compression nut 19, a quick connector 20, a buckle I21, a five-way pipeline 22, a counter electrode sample 23, a working electrode sample 24, an electrode outer support 25, an adjusting gasket 26, an electrode inner support 27, a lead 28, a rubber sealing ring I29, a rubber sealing ring II30, a rubber sealing ring III31, a threaded press cap 32, a reference electrode 33, a rubber sealing ring IV34 and a reference electrode support 35, and has the following specific structure:
the five-way pipeline 22 is characterized in that electrode outer supports 25 are symmetrically inserted into a group of opposite two-way inner cavities, a counter electrode sample 23 and a working electrode sample 24 are respectively arranged in the inner cavity of one electrode outer support 25, the counter electrode sample 23 and the working electrode sample 24 are oppositely arranged, an electrode inner support 27 is inserted into the inner cavity of each electrode outer support 25, the side faces and the back faces of the counter electrode sample 23 and the working electrode sample 24 are sealed through glue water-proof, the back faces of the counter electrode sample 23 and the working electrode sample 24 are respectively connected with a lead 28, each lead 28 penetrates through a central hole of the electrode inner support 27 to extend out, and the extending end of each lead 28 is connected with the test system 8. And a rubber sealing ring II30 is arranged between the contact surfaces of the outer end surfaces of a group of two opposite ends of the five-way pipeline 22 and the electrode outer support 25, and a rubber sealing ring I29 is arranged between the contact surfaces of the electrode inner support 27 and the outer end surface of the electrode outer support 25.
A group of opposite two ends of the five-way pipeline 22 are sequentially and symmetrically provided with a quick connector 20, a compression nut 19 and a compression solenoid 18, the quick connector 20 and the five-way pipeline 22 are fixed through a buckle I21, opposite end faces of the quick connector 20 and the five-way pipeline 22 are sealed through a rubber sealing ring 31, the wall surface of an inner cavity of the quick connector 20 is provided with an internal thread, the compression nut 19 is in threaded connection with the wall surface of the inner cavity of the quick connector 20, the end face, located in the inner cavity of the quick connector 20, of the compression nut 19 corresponds to the outer end face of the electrode outer support 25, and an adjusting gasket 26 is arranged between the end face in the inner cavity of the quick connector 20 and the outer end face of; an internal thread is arranged on the inner wall surface of a central hole of the compression nut 19, the compression solenoid 18 penetrates through the central hole of the compression nut 19 and is in threaded connection with the inner wall surface of the central hole of the compression nut 19, one end of the compression solenoid 18 corresponds to the outer end surface of the electrode inner support 27, and the electrode inner support 27 is compressed and fixed through the compression solenoid 18.
The other group of opposite two-way end parts of the five-way pipeline 22 are connected into the pipeline of the experimental loop part through buckles; an external thread is arranged at the end part of a fifth through vertically arranged on the five-way pipeline 22, the thread pressing cap 32 is connected with the end part of the fifth through a thread, a reference electrode support 35 is arranged in the inner cavity of the fifth through, a rubber sealing ring IV34 is arranged between the thread pressing cap 32 and the reference electrode support 35, and one end of a reference electrode 33 penetrates through the thread pressing cap 32 and extends into the inner cavity of the fifth through.
As shown in fig. 1 and 3, the weightlessness test tube segment 12 includes a conversion head 36, a buckle II37, a weightlessness pipe 38, a weightlessness sample 39, a weightlessness sample gasket 40, and a rubber seal ring V41, and has the following specific structure:
The working process of the invention is as follows:
when the scouring test is carried out, the valve V16 is opened, the opening and closing angles of the valve I4 and the valve II7 are adjusted, the valve III9 and the valve IV15 are closed, the submersible pump 5 outputs power to drive the experimental solution in the water storage tank 6 to enter a pipeline of an experimental loop part, the experimental solution flows through the valve II7, the electromagnetic flowmeter 17, the electrochemical test pipe section IV14, the electrochemical test pipe section III13, the weightlessness test pipe section 12, the electrochemical test pipe section II11, the electrochemical test pipe section I10 and the valve V16 and finally flows back to the water storage tank 6, an electrochemical workstation in the test system 8 collects electrochemical signals, and the PC stores and analyzes data.
The horizontal pipeline pump 1 outputs power to drive the experimental solution to enter the cooling loop part, the experimental solution flows through the cooler 2 and finally flows back to the reservoir 6, the cooler 2 is communicated with the solution for cooling, and the cooling medium and the medium flow rate can be changed according to the experimental temperature requirement. Different experimental flow rates can be realized by adjusting the opening and closing angles of the valve I4 and the valve II 7.
When the test tube is soaked in the dead water, the valve I4, the valve III9 and the valve IV15 are opened, the valve II7 and the valve V16 are closed, the experimental solution is introduced into the right side tube opening of the valve III9, the valve I4 is closed after the specified time, the introduction of the solution is stopped after the electrochemical test tube section I10, the electrochemical test tube section II11, the weightlessness test tube section 12, the electrochemical test tube section III13 and the electrochemical test tube section IV14 are filled with the solution, the valve III9 and the valve IV15 are closed, and the sealing time of the electrochemical test tube section I10, the electrochemical test tube section II11, the weightlessness test tube section 12, the electrochemical test tube section III13 and the electrochemical test tube section IV14 to be kept according to the dead water soaking time required by the experiment, and the electrochemical.
When oxygen-enriched soaking is carried out, opening a valve I4, a valve III19 and a valve IV15, closing a valve II7 and a valve V16, introducing an experimental solution into a pipe orifice on the right side of the valve III9, closing a valve I4 after a specified time, stopping introducing the solution after the electrochemical test pipe section I10, the electrochemical test pipe section II11, the weightlessness test pipe section 12, the electrochemical test pipe section III13 and the electrochemical test pipe section IV14 are filled with the solution, extending a gas guide tube into liquid soaked in the electrochemical test section IV14 from the pipe orifice on the right side of the valve III9, blowing air at a specified speed at a specified time interval according to experimental requirements, and completing the oxygen-enriched soaking, wherein an electrochemical test can be carried out during the oxygen-enriched.
As shown in fig. 4 and 5, the electrochemical test results obtained by a certain sample over time show that the device can stably test open-circuit potential and electrochemical impedance spectrum with high requirement on system stability, and can reflect the evolution rule of the corrosion resistance of the sample over time under the condition, which indicates that the device has good test stability.
As shown in fig. 6, the same sample is at four electrochemical positions, and the electrochemical test results obtained under the same test environment respectively show that the open circuit potentials at the four positions have very small differences, which indicates that the four electrochemical positions of the device have test reproducibility within the experimental error range, and the test of the same or different samples can be simultaneously carried out at the four electrochemical test positions, thereby greatly improving the experimental efficiency, and making the experimental data more convincing.
The results show that the device has the advantages of the pipe flow type erosion corrosion experiment device, can research the axial erosion corrosion behavior of the inner wall of the pipeline under the condition of truly simulating the working condition of the actual pipe flow, can accurately control the test parameters such as temperature, flow rate and medium components, simulate the initial soaking environment of the pipeline and the like, and can simultaneously realize the online electrochemical monitoring and the weight loss test of a plurality of same or different samples.
Claims (10)
1. The utility model provides a pipe flow formula experimental apparatus of simulation pipeline inner wall axial scour corrosion, a serial communication port, the device has experiment loop portion, cooling circuit portion, test system, immersible pump delivery port links to each other with experiment loop portion entry end through plastic hose I, the electrochemistry test tube section of experiment loop portion distributes in the upper and lower both sides of weightlessness test tube section, the sample of electrochemistry test tube section passes through the wire and links to each other with test system, experiment loop portion exit end submergence is in cistern liquid level below, the horizontal tubing pump water inlet of cooling circuit portion stretches into the cistern bottom through stainless steel braided tube, horizontal tubing pump delivery port links to each other with the cooler water inlet through plastic hose II, the one end of plastic hose III is connected to the cooler delivery port, the other end submergence of plastic hose III is in cistern liquid level below.
2. The pipe flow type experimental device for simulating the axial erosion corrosion of the inner wall of the pipeline according to claim 1, wherein the experimental loop part is provided with a water storage tank, a submersible pump, a plastic hose I, an electromagnetic flow meter, an electrochemical test pipe section I, an electrochemical test pipe section II, an electrochemical test pipe section III, an electrochemical test pipe section IV and a weightlessness test pipe section, the submersible pump is arranged at the bottom in the water storage tank, a water outlet of the submersible pump is connected with one end of the plastic hose I through a stainless steel conical pipe, and the other end of the plastic hose I is connected with an inlet end of the experimental loop part; an electromagnetic flowmeter, an electrochemical test pipe section IV, an electrochemical test pipe section III, a weightlessness test pipe section, an electrochemical test pipe section II and an electrochemical test pipe section I are sequentially arranged in an ascending pipeline of the experimental loop part from bottom to top, the electromagnetic flowmeter is fixed on a pipeline bracket through a lifting device, and two ends of the electromagnetic flowmeter are communicated with the pipeline on the experimental loop through flange plates welded with buckles.
3. The pipe flow experimental device for simulating the axial erosion corrosion of the inner wall of the pipeline according to claim 2, wherein a valve II is arranged on a pipe section communicated between the electromagnetic flowmeter and the plastic hose I, a vertical bypass is arranged on the pipe section, a lower port of the bypass extends to the upper part in the water storage tank, and the valve I is arranged on the bypass.
4. A tubular flow experimental apparatus for simulating axial erosion corrosion of inner wall of pipeline according to claim 2, wherein a valve V is installed in the descending pipeline of the experimental loop part, and a vertical bypass is provided on the descending pipeline, the lower port of the bypass is located above the reservoir, and a valve IV is installed on the bypass; the lower port of the descending pipeline of the experiment loop part is the outlet end of the experiment loop part, and the outlet end of the experiment loop part is immersed below the liquid level of the reservoir.
5. A tubular flow experimental apparatus for simulating axial erosion corrosion of an inner wall of a pipeline according to claim 2, wherein an ascending pipeline of the experimental loop part and a descending pipeline of the experimental loop part are parallel to each other, an upper port of the ascending pipeline is communicated with an upper port of the descending pipeline through a horizontal pipeline, a horizontal bypass is arranged on the horizontal pipeline, one end of the bypass is opened, and a valve III is installed on the bypass.
6. The tubular flow experimental device for simulating the axial erosion corrosion of the inner wall of the pipeline as claimed in claim 2, wherein the pipeline of the experimental loop part is fixed by a pipeline bracket, the adjacent pipe sections of the experimental loop part are fixed by a buckle, the adjacent pipe sections of the experimental loop part are sealed by a rubber sealing ring in a waterproof way, and the inner wall of the pipeline of the experimental loop part is subjected to rust prevention treatment.
7. The tubular flow experimental apparatus for simulating axial erosive corrosion of an inner wall of a pipeline according to claim 2, wherein the electrochemical test tube section I, the electrochemical test tube section II, the electrochemical test tube section III and the electrochemical test tube section IV are all five-way structures, and the five-way structure comprises: hold in the palm, the adjusting washer, holds in the palm in the electrode, wire, rubber seal I, rubber seal II, rubber seal III, screw thread pressure cap, reference electrode, rubber seal IV, reference electrode support outside compressing tightly solenoid, gland nut, quick interface, buckle, five-way pipeline, counter electrode sample, working electrode sample, electrode, concrete structure as follows:
the electrode outer supports are symmetrically inserted into a group of opposite two-way inner cavities of the five-way pipeline, a counter electrode sample and a working electrode sample are respectively arranged in the inner cavity of one electrode outer support, the counter electrode sample and the working electrode sample are oppositely arranged, an electrode inner support is inserted into the inner cavity of each electrode outer support, the back sides of the counter electrode sample and the working electrode sample are respectively connected with one lead, each lead penetrates through a central hole of the electrode inner support to extend out, and the extending end of each lead is connected with a test system; a rubber sealing ring II is arranged between the electrode outer support and the contact surface of one group of two opposite outer end surfaces of the five-way pipeline, and a rubber sealing ring I is arranged between the electrode inner support and the contact surface of the outer end surface of the electrode outer support;
the quick connector, the compression nut and the compression screw pipe are sequentially and symmetrically arranged at one group of opposite two ends of the five-way pipeline, the quick connector and the five-way pipeline are fixed through a buckle I, the quick connector and the opposite end faces of the five-way pipeline are sealed through rubber sealing rings, internal threads are arranged on the wall face of an inner cavity of the quick connector, the compression nut is connected with the wall face of the inner cavity of the quick connector through threads, the end face of the compression nut, which is positioned in the inner cavity of the quick connector, corresponds to the outer end face of the outer electrode holder, and an adjusting gasket is arranged between the end face in the inner cavity of the quick connector and the outer; an internal thread is arranged on the inner wall surface of a central hole of the compression nut, a compression solenoid is arranged in the central hole of the compression nut in a penetrating way and is connected with the inner wall surface of the central hole of the compression nut through a thread, one end of the compression solenoid corresponds to the outer end surface of the electrode inner support, and the electrode inner support is compressed and fixed through the compression solenoid;
the other group of opposite two-way end parts of the five-way pipeline are connected into the pipeline of the experimental loop part through a buckle; the outer thread is arranged at the end part of a fifth through vertically arranged on the five-way pipeline, the thread pressing cap is connected with the end part of the fifth through threads, the inner cavity of the fifth through is provided with a reference electrode support, a rubber sealing ring IV is arranged between the thread pressing cap and the reference electrode support, and one end of the reference electrode penetrates through the thread pressing cap to extend into the inner cavity of the fifth through.
8. The pipe flow type experimental device for simulating axial erosion corrosion of the inner wall of a pipeline according to claim 2, wherein the weightlessness test pipe section comprises a conversion head, a buckle II, a weightlessness pipeline, a weightlessness sample gasket and a rubber seal ring V, and the specific structure is as follows:
weightless samples are uniformly distributed in the weightless pipeline, adjacent weightless samples are insulated and separated through weightless sample gaskets, the weightless samples are clamped with the adjacent weightless sample gaskets, two ends of the weightless pipeline are respectively connected with one end of an adapter through a buckle II and sealed through a rubber sealing ring V, and the other end of each adapter is connected into a pipeline of the experimental loop part.
9. The tubular experimental apparatus for simulating axial erosion corrosion of inner wall of pipeline according to claim 1, wherein the cooling circuit part is provided with a horizontal tubular pump, a cooler, a plastic hose II, a stainless steel braided tube and a plastic hose III, the water inlet of the horizontal tubular pump is connected with one end of the stainless steel braided tube, the other end of the stainless steel braided tube extends into the bottom of the reservoir, the water outlet of the horizontal tubular pump is connected with one end of the plastic hose II, the other end of the plastic hose II is connected with the experimental solution inlet end of the cooler, and the experimental solution outlet end of the cooler is connected into the reservoir through the plastic hose III.
10. A tubular flow test device for simulating axial erosive corrosion of an inner wall of a pipeline according to claim 9, wherein the cooler is provided with an inlet and an outlet for a cooling solution, and the cooler is communicated with an external cooling solution.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988063A (en) * | 2019-11-27 | 2020-04-10 | 中国科学院金属研究所 | Electrochemical test electrode system for realizing deep-sea high-pressure high-flow-rate aqueous solution system |
| CN114677890A (en) * | 2022-04-01 | 2022-06-28 | 西安国际医学中心有限公司 | Research device for simulating blood circulation of human blood vessels in weightless state |
| CN115201098A (en) * | 2022-07-20 | 2022-10-18 | 刘泓江 | Bridge corrosion simulation test device for acid sedimentation |
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2020
- 2020-10-19 CN CN202011116086.6A patent/CN112326486A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110988063A (en) * | 2019-11-27 | 2020-04-10 | 中国科学院金属研究所 | Electrochemical test electrode system for realizing deep-sea high-pressure high-flow-rate aqueous solution system |
| CN114677890A (en) * | 2022-04-01 | 2022-06-28 | 西安国际医学中心有限公司 | Research device for simulating blood circulation of human blood vessels in weightless state |
| CN115201098A (en) * | 2022-07-20 | 2022-10-18 | 刘泓江 | Bridge corrosion simulation test device for acid sedimentation |
| CN115201098B (en) * | 2022-07-20 | 2023-04-18 | 刘泓江 | Bridge corrosion simulation test device for acid sedimentation |
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