CN113324865A - Liquid-solid two-phase flow pipeline erosion corrosion test device - Google Patents
Liquid-solid two-phase flow pipeline erosion corrosion test device Download PDFInfo
- Publication number
- CN113324865A CN113324865A CN202110584149.9A CN202110584149A CN113324865A CN 113324865 A CN113324865 A CN 113324865A CN 202110584149 A CN202110584149 A CN 202110584149A CN 113324865 A CN113324865 A CN 113324865A
- Authority
- CN
- China
- Prior art keywords
- test
- experiment
- corrosion
- pipeline
- erosion corrosion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 137
- 238000005260 corrosion Methods 0.000 title claims abstract description 110
- 230000007797 corrosion Effects 0.000 title claims abstract description 107
- 230000003628 erosive effect Effects 0.000 title claims abstract description 91
- 239000007787 solid Substances 0.000 title claims abstract description 46
- 230000005514 two-phase flow Effects 0.000 title claims abstract description 36
- 238000002474 experimental method Methods 0.000 claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000006056 electrooxidation reaction Methods 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 44
- 239000006004 Quartz sand Substances 0.000 claims description 30
- 239000013535 sea water Substances 0.000 claims description 29
- 239000012535 impurity Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 10
- 239000000741 silica gel Substances 0.000 claims description 10
- 229910002027 silica gel Inorganic materials 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000000840 electrochemical analysis Methods 0.000 claims description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- 229910000570 Cupronickel Inorganic materials 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000010287 polarization Effects 0.000 claims description 4
- 238000001291 vacuum drying Methods 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 3
- 229920000742 Cotton Polymers 0.000 claims description 2
- 244000137852 Petrea volubilis Species 0.000 claims description 2
- 238000004220 aggregation Methods 0.000 claims description 2
- 230000002776 aggregation Effects 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 238000001453 impedance spectrum Methods 0.000 claims description 2
- 238000000386 microscopy Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 20
- 230000004580 weight loss Effects 0.000 abstract description 8
- 238000011160 research Methods 0.000 description 5
- 238000009991 scouring Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 206010033799 Paralysis Diseases 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
- G01N3/567—Investigating resistance to wear or abrasion by submitting the specimen to the action of a fluid or of a fluidised material, e.g. cavitation, jet abrasion
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
- G01N3/565—Investigating resistance to wear or abrasion of granular or particulate material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
Landscapes
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Pathology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention belongs to the field of metal corrosion protection, and relates to a liquid-solid two-phase flow pipeline erosion corrosion test device, which comprises a main body structure, a water tank, an experiment pipeline, a vibration platform, a test bent pipe and an electrochemical workstation, wherein the transparent experiment pipeline can visually observe the motion condition of solid particles; the device has a simple structure, can test the erosion corrosion appearance, the erosion corrosion weight loss and the electrochemical corrosion characteristics of a pipeline containing solid particles in a vibration environment, and can be suitable for a liquid-solid two-phase flow pipeline erosion corrosion test in a non-vibration environment after a main structure is removed from a vibration platform.
Description
The technical field is as follows:
the invention belongs to the field of metal corrosion protection, and relates to a liquid-solid two-phase flow pipeline erosion corrosion test device, which realizes the observation of solid particle motion in a two-phase flow pipeline, the appearance test of erosion corrosion at different positions of a bent pipe, the weight loss test of erosion corrosion and the test of electrochemical corrosion characteristics in a vibration environment.
Background art:
the material erosion corrosion can be caused by the collision of corrosive fluid containing solid particles and the surface of the material, the erosion corrosion widely exists in industries such as petroleum, chemical engineering, ships, water conservancy and the like, equipment exposed in moving fluid can be eroded, and in multiphase flow containing the solid particles, the damage is more serious, so that parts, pipelines and the like are damaged, the equipment failure and the pipeline leakage are caused, and the equipment safety is seriously threatened. In the ship industry, a seawater pipeline system consists of more than ten subsystems such as a main engine cooling system, an auxiliary engine cooling system, a fire extinguishing system pipeline system, a bilge drainage system pipeline system and the like, plays an important role in cooling, fire fighting and the like, is extremely wide in distribution, is complex and changeable in service environment working conditions, and has large differences in dynamic and static states, flow rates, flow states, temperatures, solid particles and the like. Because the sea water environment of the navigation sea area of the ship is complex, particularly when the ship navigates through the sea area with high silt content, solid impurities such as silt and the like are easy to be absorbed into a sea water pipeline, and perforation leakage occurs under the high-flow-rate scouring of the sea water containing the solid impurities, so that the ship has to return to a dock for maintenance, and the offshore navigation of the ship is seriously influenced.
The realization of high navigational speed, high maneuverability and high load performance of the ship needs the seawater pipeline system to improve the supply flow as a guarantee, and provides higher requirements for the maximum allowable flow speed. At present, the maximum designed flow rate of a second-generation seawater pipeline represented by copper-nickel alloy does not exceed 3.6m/s, but the influence of multiple factors of seawater is not considered, and under the combined action of dynamic seawater and silt, a red copper and copper-nickel alloy pipeline system can be seriously corroded and damaged by scouring even at a low flow rate. For the developing third generation titanium alloy seawater pipeline system, the research on the silt seawater scouring corrosion resistance is almost blank, and the dynamic seawater environment adaptability data is seriously deficient. In addition, when the ship sails, the ship inevitably generates vibration due to factors such as power device operation, fluid pulsation and the like, wherein low-frequency periodic vibration energy is large and is far propagated, so that the flow field in the seawater pipe is changed. The fine solid particles are sucked into a seawater system through the filter to form seawater-solid particle two-phase flow, the vibration wall surface and the flow field in the pipe form fluid-solid coupling and are mutually excitation sources, the flow characteristics of the two-phase flow change, and the abrasion condition of the pipeline is more complex and difficult to predict. The wall vibration can change the motion track and the impact strength of solid particles, and has great influence on the erosion and abrasion of the wall. Once the seawater pipeline fails due to sudden pressure change or too fast abrasion, the cooling seawater cannot reach the central cooler to cool the main engine, the auxiliary engine and other devices, and the fire-fighting system and the ballast adjustment cannot work normally, so that the whole ship power system is paralyzed. The service life of the seawater pipeline system is seriously influenced by the problem of two-phase flow erosion corrosion in the vibration environment, the navigation safety of ships is threatened, and a research test device and a test method for the erosion corrosion of the seawater pipeline in the vibration environment need to be designed urgently, so that the failure part of the pipeline is predicted, the design of the seawater pipeline system is guided, and the safety and the stability of the seawater pipeline system are improved.
At present, the test device for carrying out experimental research on the erosion corrosion comprises a rotary erosion test device, a jet erosion test device and a pipe flow erosion test device: the rotary erosion test device mainly aims at liquid-solid two-phase flow, the solution for testing is small in amount, simple to operate, short in test period and high in stability, but slurry is uneven in concentration, eddy is easy to generate, and data reliability is low; the jet flow type scouring device can well control parameters such as impact flow velocity, particle attack angle and particle concentration, but cannot well simulate actual working condition conditions, and the scouring corrosion effect is more serious than the actual condition; the pipe flow type erosion corrosion test device can well simulate the actual working condition in a pipe and has good hydrodynamic model support, but the vibration working condition is rarely considered. In addition, the erosion corrosion rate test of the elbow part of the pipeline mainly tests the weight loss of the whole elbow or selects a few measuring points to measure the weight loss of a sample at the central line of the outer arch of the elbow and the 45-degree part of the elbow, so that the erosion corrosion distribution of the whole elbow cannot be obtained, and the erosion corrosion test of the straight pipe section near the elbow is more rarely researched. The device is limited by the measurement technology, the test cost and the characteristics of the seawater-sand two-phase flow, and no device capable of measuring the liquid-solid two-phase flow erosion corrosion test in the vibration environment exists in the prior art and documents. Therefore, in order to evaluate the erosion corrosion performance of the two-phase flow of the pipeline under the action of the erosion-vibration coupling, the erosion corrosion test device for the liquid-solid two-phase flow pipeline in the vibration environment is designed to test the erosion corrosion appearance, the erosion corrosion weight loss and the erosion corrosion electrochemical corrosion characteristics of the bent pipe at different positions, observe the movement and the particle distribution of solid particles, and has important significance for disclosing the erosion corrosion mechanism of the pipeline under the action of the erosion-vibration coupling and ensuring the safe operation of the pipeline.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, research and design a liquid-solid two-phase flow pipeline erosion corrosion test device, and analyze and research the erosion corrosion problem of a metal pipeline under the working condition of containing solid particle two-phase flow in a vibration environment.
In order to achieve the purpose, the main structure of the liquid-solid two-phase flow pipeline erosion corrosion test device comprises a water tank, an experiment pipeline, a vibration platform, a test bent pipe and an electrochemical workstation; an experimental pipeline led out from the water tank is connected with a test bent pipe arranged on the vibration platform and then returns to the water tank to form an annular structure, and the test bent pipe is connected with an independently arranged electrochemical workstation.
The invention relates to a water tank which is internally provided with a stirrer; a ball valve, a corrosion-resistant wear-resistant pump, a check valve, an electromagnetic flowmeter and a diaphragm pressure gauge are sequentially arranged on the experimental pipeline between the water tank and the test elbow along the medium direction; the experimental pipeline is connected with the test bent pipe in a bolt manner; and a sampling valve is arranged on the experimental pipeline at the rear end of the test bent pipe.
The test elbow comprises an inner arch and an outer arch, wherein half of flanges are arranged at the end parts of the inner arch and the outer arch, the half of flanges and the inner arch or the outer arch are of an integrated structure, the test elbow comprises an elbow, an upstream straight pipe section and a downstream straight pipe section, a plurality of grooves for placing experimental samples are arranged on the inner wall of the test elbow, and a reference electrode preformed hole and an auxiliary electrode preformed hole are formed in the outer arch; the experiment pipeline is connected with the test bent pipe through a bolt and a flange.
The length, width and thickness of the experimental sample are matched with those of the groove, and the experimental sample is flush with the inner wall of the test bent pipe after being fixed in the groove in a sticking mode, so that the flowing of a medium is not affected.
When the liquid-solid two-phase flow pipeline erosion corrosion test device related to the invention is used for experiments, in order to facilitate analysis, experiment samples are numbered according to positions; weighing the weight of the experimental sample before and after the experiment by using an electronic balance according to a formula:
calculating the erosion corrosion rate, wherein VECThe erosion rate is expressed in mm/a; w is a0The mass of the experimental sample before the test is given as g; w is a1The unit is g for the mass of the test sample after erosion corrosion; s is the working area of the experimental sample, and the unit is m2(ii) a t is the time for erosion corrosion in unit of a; rhowThe density of the test specimen is in kg/m3(ii) a The morphology of the metal surface was studied by microscopy: observing the macroscopic morphology of the test sample after erosion corrosion by using a three-dimensional video microscope, and measuring the maximum corrosion pit depth; observing the erosion corrosion micro-morphology by adopting an electron scanning microscope; and testing the open-circuit potential, polarization and impedance characteristics of the experimental sample by adopting a multi-channel electrochemical workstation.
The main body structure of the liquid-solid two-phase flow pipeline erosion corrosion test device is suitable for a non-vibration environment after the vibration platform is removed.
Compared with the prior art, the transparent experimental pipeline can visually observe the motion condition of solid particles, a plurality of detachable groove measuring points arranged on the inner wall of the testing elbow provide a basis for testing erosion corrosion appearance, erosion corrosion weight loss and erosion corrosion electrochemical characteristics of different parts, the erosion electrochemical corrosion characteristics at each measuring point position are obtained through the multi-channel electrochemical workstation, and a high-speed camera is additionally arranged to shoot the motion and collision process of the solid particles; the device has a simple structure, and can test the erosion corrosion appearance, the erosion corrosion weight loss and the electrochemical corrosion characteristics of a pipeline containing solid particles in a vibration environment.
Description of the drawings:
fig. 1 is a schematic diagram of the principle of the main structure of the present invention.
Fig. 2 is a schematic structural diagram of a test elbow according to the present invention.
Fig. 3 is a schematic structural view of an outer arch according to the present invention.
Fig. 4 is a schematic structural view of an inner arch according to the present invention.
FIG. 5 is a schematic view showing a connection relationship between an experimental sample and a screw according to the present invention.
The specific implementation mode is as follows:
the invention is further described by way of example with reference to the accompanying drawings.
Example 1:
the main structure of the liquid-solid two-phase flow pipeline erosion corrosion test device related to this embodiment is shown in fig. 1, and includes a water tank 1, an experimental pipeline 2, a vibration platform 3, a test elbow 4, a stirrer 5, a ball valve 6, a corrosion-resistant wear-resistant pump 7, a check valve 8, an electromagnetic flowmeter 9, a diaphragm pressure gauge 10, an electrochemical workstation 11, and a sampling valve 12; wherein, the water tank 1 and the stirrer 5 are matched to form a medium storage and mixing system to provide continuous and stable liquid-solid two-phase flow medium; the visual experimental pipeline 2, the test bent pipe 4, the ball valve 6, the corrosion-resistant wear-resistant pump 7 which is provided with a variable frequency motor and can convey solid particles, the check valve 8 and the sampling valve 12 are matched to form a liquid-solid two-phase flow conveying loop, so that the flow state of two-phase flow and the motion trajectory condition of the solid particles can be observed, and the flow rate of a medium can be adjusted by adjusting the rotating speed of the corrosion-resistant wear-resistant pump 7; the vibration platform 3 is used as a vibration excitation system to enable the test bent pipe 4 to vibrate along the vertical or horizontal direction; the electrochemical workstation 11 is used as an electrochemical testing system for simultaneously testing electrochemical corrosion characteristics at a plurality of different positions; the external computer, the electromagnetic flowmeter 9 and the diaphragm pressure gauge 10 are matched to form a data acquisition system, and monitoring parameters comprise vibration working conditions, flow (converted into flow velocity) and flow pressure of the test elbow 4; an experimental pipeline 2 led out from the water tank 1 is connected with a test bent pipe 4 arranged on a vibration platform 3 and then returns to the water tank 1 to form an annular structure; a stirrer 5 is arranged in the water tank 1, a ball valve 6, an anti-corrosion wear-resistant pump 7, a check valve 8, an electromagnetic flowmeter 9 and a diaphragm pressure gauge 10 are sequentially arranged on the experimental pipeline 2 between the water tank 1 and the test elbow 4 along the medium direction, the test elbow 4 is connected with an independently arranged electrochemical workstation 11, and a sampling valve 12 is arranged on the experimental pipeline 2 at the rear end of the test elbow 4; the test elbow 4 consists of an inner arch 41, an outer arch 42 and a flange 43 with an integrated structure, and comprises an elbow, an upstream straight pipe section and a downstream straight pipe section, wherein the inner wall of the inner arch 41 is provided with 15 grooves 44, the inner wall of the outer arch 42 is provided with 21 grooves 44, and the outer arch 42 is also provided with a reference electrode preformed hole 45 and an auxiliary electrode preformed hole 46; the groove 44 is used for placing the test sample 100 to test erosion corrosion appearance and erosion corrosion weight loss at different positions, the test sample 100 is connected with the screw 200, and the screw 200 is connected with the nut 300 after passing through the groove 44.
The test elbow 4 that this embodiment relates to is the horizontal return bend of repeatedly dismouting usefulness of high wear-resisting material (polymer polyethylene) preparation to prevent to contain the continuous impact test elbow 4 of solid particle and cause the pipe wall wearing and tearing, make it in the experimentation, the shape has not obvious change, and the nominal diameter of test elbow 4 is DN50 (the internal diameter is 54mm), and the radius ratio is 1.33.
Example 2:
in the experiment of the liquid-solid two-phase flow pipeline erosion corrosion test device related to the embodiment, the specific process comprises three stages of preparation before the experiment, erosion corrosion experiment and post-treatment after the experiment:
checking tightness, opening the corrosion-resistant and wear-resistant pump 7 to inject seawater into the experimental pipeline 2, verifying whether the pipeline is in good connection and whether leakage existsAir is discharged to prevent the air from being mixed to form three-phase flow to generate cavitation damage to the corrosion-resistant and wear-resistant pump 7; meanwhile, cutting B10 copper-nickel alloy into a cuboid with the specification of 8mm multiplied by 6mm multiplied by 5mm, forming a screw hole for a screw rod 200 to pass through on the cuboid, removing oil with acetone, cleaning oil stains in the screw hole, polishing the surface with No. 240-1000 # water-milled sand paper, cleaning with absolute ethyl alcohol, dehydrating, and placing in a vacuum drying oven for drying for 12 hours to obtain an experimental sample 100; weighing the mass of the test sample 100 before the test by adopting an electronic balance with the precision of 0.01 mg; then, the dimensions of the test specimen 100 were measured using a vernier caliper, and the working area of the test specimen 100 was 48mm2(ii) a Screwing the screw 200 into the experimental sample 100, coating the experimental sample 100 in the groove 44 one by 704 silica gel, cementing the inner arch 41 and the outer arch 42 to form a test elbow 4, placing the test elbow 4 in a ventilation position for at least 24 hours, and fully curing the silica gel;
taking natural seawater as experimental water, and taking quartz sand as experimental sand (removing impurities from quartz sand, pickling, drying, and sieving to obtain 100 μm quartz sand with edges); before each experiment, adding quartz sand into the water tank 1 to enable the mass fraction of the quartz sand in the water tank 1 to be 1%, starting the stirrer 5 when the experiment starts, enabling natural seawater and the quartz sand to be uniformly mixed to form a mixture fluid, conveying the mixture into the experiment pipeline 2 by the corrosion-resistant and wear-resistant pump 7, adjusting the frequency of the corrosion-resistant and wear-resistant pump 7 by adjusting the parameters of a frequency converter externally connected with the corrosion-resistant and wear-resistant pump 7 to ensure the accuracy and stability of the flow velocity of the mixture fluid, and performing corresponding calculation according to the flow, the pressure and the temperature to enable the flow velocity of a medium in the experiment pipeline 2 to be stabilized at a value required by the experiment; recording the start time of erosion corrosion, monitoring flow and pressure parameters, and observing the flow state of the mixture fluid, wherein the erosion corrosion experiment time is 72 h;
the test content is divided into three parts, the first part is to verify the influence of the vibration parameter change on the erosion corrosion of the test elbow 4, the flow and flow speed parameters of the seawater-sand two-phase flow are fixed values, the vibration parameters are changed one by one on the premise of ensuring the accuracy of the initial value, and the erosion corrosion rate corresponding to each working point is tested: in the medium circulation process, sand grains are crushed by collision, the grain size is reduced, and quartz sand and seawater are replaced after each test is finished; the second part is to verify the influence of the flow velocity change in the vibration environment on the erosion corrosion rate of the test elbow 4, and at the moment, the mass fraction of the quartz sand is controlled, and the flow velocity of the medium is adjusted, so that the influence of the flow velocity on the erosion corrosion can be analyzed; the third part is to study the mass fraction of the quartz sand in the vibration environment, namely the influence of the flow of the quartz sand on the erosion corrosion of the test elbow 4, and at the moment, the flow velocity of the medium is controlled and the mass fraction of the quartz sand is adjusted;
in the test process, the sampling valve 12 is opened to sample every set time period, and the mass fraction of the quartz sand is analyzed to ensure that the quartz sand is kept accurate and stable in the test process; the medium flow is tested by using the electromagnetic flowmeter 9, data are collected in real time, the real-time flow rate is calculated and obtained in an external computer, the average value of the long-period collected data is used as the flow rate value of the medium, the motion state and the distribution condition of the quartz sand are observed through the visual experiment pipeline 2, and the collision and aggregation rule of the quartz sand is analyzed;
after the experiment, taking down the test bent pipe 4, firstly removing impurities on the inner wall of the test bent pipe 4 by using deionized water, taking out the experiment samples 100 one by one according to the sequence of the labels, removing silica gel around the experiment samples 100 to ensure that no residue exists in the silica gel, removing the impurities penetrating through holes of the screw 200 at the back of the experiment samples 100, wiping the impurities by absorbent cotton stained with absolute ethyl alcohol to ensure that the silica gel and the impurities are cleaned completely, placing the experiment samples 100 in a vacuum drying box for drying for 12 hours, then taking out the experiment samples 100, and weighing the weight of the experiment samples 100 by using an electronic balance; in order to reduce experiment errors, each group of experiment working conditions is subjected to a parallel experiment, natural seawater and quartz sand are replaced after each experiment is finished, and the average value of the results of the two experiments is taken as the erosion corrosion rate.
The weight loss-corrosion morphology test and the electrochemical test of the liquid-solid two-phase flow pipeline erosion corrosion test device related to the embodiment are separately and independently performed, because the electrochemical test experiment process can affect the surface corrosion morphology of the experiment sample 100; the test conditions and the steps of the two are the same, except that when an electrochemical test experiment is carried out, the erosion corrosion time of each group of experiments is controlled according to the experiment requirements, a three-electrode system is adopted, the multi-channel electrochemical workstation 11 is connected with the experiment sample 100 of the test bent pipe 4, and the electrochemical corrosion characteristics including open-circuit potential, polarization curve and impedance spectrum at different positions are tested at the same time; and analyzing the erosion corrosion mechanism according to the erosion corrosion morphology, the corrosion rate and the electrochemical corrosion characteristics under different working conditions.
Claims (9)
1. A liquid-solid two-phase flow pipeline erosion corrosion test device is characterized in that a main body structure comprises a water tank, an experiment pipeline, a vibration platform, a test bent pipe and an electrochemical workstation; an experimental pipeline led out from the water tank is connected with a test bent pipe arranged on the vibration platform and then returns to the water tank to form an annular structure, and the test bent pipe is connected with an independently arranged electrochemical workstation.
2. The liquid-solid two-phase flow pipeline erosion corrosion test device according to claim 1, wherein a stirrer is arranged in the water tank; a ball valve, a corrosion-resistant wear-resistant pump, a check valve, an electromagnetic flowmeter and a diaphragm pressure gauge are sequentially arranged on the experimental pipeline between the water tank and the test elbow along the medium direction; the experimental pipeline is connected with the test bent pipe in a bolt manner; and a sampling valve is arranged on the experimental pipeline at the rear end of the test bent pipe.
3. The liquid-solid two-phase flow pipeline erosion corrosion test device according to claim 1 or 2, characterized in that the test elbow is composed of an inner arch and an outer arch, half of flanges are arranged at the end parts of the inner arch and the outer arch, the half of flanges and the inner arch or the outer arch are of an integrated structure, the test elbow comprises an elbow, an upstream straight pipe section and a downstream straight pipe section, the inner wall of the test elbow is provided with a plurality of grooves for placing test samples, and the outer arch is provided with a reference electrode preformed hole and an auxiliary electrode preformed hole; the experiment pipeline is connected with the test bent pipe through a bolt and a flange.
4. The liquid-solid two-phase flow pipeline erosion corrosion test device according to claim 1, wherein the test elbow is a horizontal elbow made of wear-resistant materials and capable of being repeatedly disassembled and assembled for use, the nominal diameter of the test elbow is DN50, and the radius ratio of the test elbow is 1.33.
5. The liquid-solid two-phase flow pipeline erosion corrosion test device according to claim 3, wherein the length, width and thickness dimensions of the test sample are matched with those of the groove, and the test sample is adhered and fixed in the groove and then flush with the inner wall of the test elbow.
6. The liquid-solid two-phase flow pipeline erosion corrosion test device according to claim 5, wherein during the test, test samples are numbered according to positions; weighing the weight of the experimental sample before and after the experiment by using an electronic balance according to a formula:
calculating the erosion corrosion rate, wherein VECThe erosion rate is expressed in mm/a; w is a0The mass of the experimental sample before the test is given as g; w is a1The unit is g for the mass of the test sample after erosion corrosion; s is the working area of the experimental sample, and the unit is m2(ii) a t is the time for erosion corrosion in unit of a; rhowThe density of the test specimen is in kg/m3(ii) a The morphology of the metal surface was studied by microscopy: observing the macroscopic morphology of the test sample after erosion corrosion by using a three-dimensional video microscope, and measuring the maximum corrosion pit depth; observing the erosion corrosion micro-morphology by adopting an electron scanning microscope; and testing the open-circuit potential, polarization and impedance characteristics of the experimental sample by adopting a multi-channel electrochemical workstation.
7. The liquid-solid two-phase flow pipeline erosion corrosion test device of claim 1, wherein the main structure is adapted to a non-vibration environment after the vibration platform is removed.
8. The liquid-solid two-phase flow pipeline erosion corrosion test device according to claim 6, wherein the specific process comprises three stages of preparation before the experiment, erosion corrosion experiment and post-experiment treatment:
checking the tightness, opening the corrosion-resistant wear-resistant pump to inject seawater into the experimental pipeline, verifying whether the pipeline is in good connection, and discharging air to prevent the corrosion-resistant wear-resistant pump from being damaged by cavitation caused by three-phase flow formed by air mixing; meanwhile, cutting B10 copper-nickel alloy into a cuboid with the specification of 8mm multiplied by 6mm multiplied by 5mm, forming a screw hole for a screw to pass through on the cuboid, removing oil by using acetone, cleaning oil stains in the screw hole, polishing the surface by using No. 240-1000 # water-milled sand paper, cleaning by using absolute ethyl alcohol, dewatering, and then placing in a vacuum drying oven for drying for 12 hours to obtain an experimental sample; weighing the mass of the experimental sample before the experiment by adopting an electronic balance with the precision of 0.01 mg; then, the dimensions of the test specimens were measured using a vernier caliper, the working area of the test specimens being 48mm2(ii) a Screwing the screw rod into an experimental sample, coating the experimental sample in the groove one by using 704 silica gel, cementing the inner arch and the outer arch to form a test bent pipe, placing the test bent pipe at a ventilation position for at least 24 hours, and fully curing the silica gel;
taking natural seawater as experimental water, and taking quartz sand as experimental sand; before each experiment, adding quartz sand into a water tank, so that the mass fraction of the quartz sand in the water tank is 1%, starting a stirrer when the experiment starts, uniformly mixing natural seawater and the quartz sand to form a mixture fluid, conveying the mixture into an experiment pipeline by using a corrosion-resistant wear-resistant pump, adjusting the frequency of the corrosion-resistant wear-resistant pump by adjusting the parameters of a frequency converter externally connected with the corrosion-resistant wear-resistant pump, and performing corresponding calculation according to flow, pressure and temperature so that the flow velocity of a medium in the experiment pipeline is stabilized at a value required by the experiment; recording the start time of erosion corrosion, monitoring flow and pressure parameters, and observing the flow state of the mixture fluid, wherein the erosion corrosion experiment time is 72 h;
the test content is divided into three parts, the first part is to verify the influence of vibration parameter change on the erosion corrosion of the test elbow, and at the moment, the flow and flow speed parameters of the seawater-sand two-phase flow are fixed values, on the premise of ensuring the accuracy of an initial value, the vibration parameters are changed one by one, and the erosion corrosion rate corresponding to each working point is tested: in the medium circulation process, sand grains are crushed by collision, the grain size is reduced, and quartz sand and seawater are replaced after each test is finished; the second part is to verify the influence of the flow velocity change in the vibration environment on the erosion corrosion rate of the test elbow, at the moment, the mass fraction of the quartz sand is controlled, the flow velocity of the medium is adjusted, and the influence of the flow velocity on the erosion corrosion can be analyzed; the third part is to study the mass fraction of the quartz sand in the vibration environment, namely the influence of the quartz sand flow on the erosion corrosion of the test elbow, and at the moment, the flow velocity of the medium is controlled, and the mass fraction of the quartz sand is adjusted;
in the test process, the sampling valve is opened to sample every set time period, and the mass fraction of the quartz sand is analyzed to ensure that the quartz sand is kept accurate and stable in the test process; the method comprises the steps of testing medium flow by using an electromagnetic flowmeter, collecting data in real time, calculating to obtain a real-time flow rate in an external computer, adopting an average value of long-period collected data as a flow rate value of a medium, observing the motion state and distribution condition of quartz sand through a visual experiment pipeline, and analyzing the collision and aggregation rule of the quartz sand;
after the experiment, taking down the test bent pipe, firstly removing impurities on the inner wall of the test bent pipe by using deionized water, taking out the experiment samples one by one according to the sequence of the labels, removing silica gel around the experiment samples to ensure that no residue exists in the silica gel, removing the impurities in screw rods penetrating through holes on the back of the experiment samples, wiping the impurities by absorbent cotton stained with absolute ethyl alcohol to ensure that the silica gel and the impurities are cleaned completely, placing the experiment samples in a vacuum drying oven for drying for 12 hours, then taking out the experiment samples, and weighing the weight of the experiment samples after the experiment by using an electronic balance; in order to reduce experiment errors, each group of experiment working conditions is subjected to a parallel experiment, natural seawater and quartz sand are replaced after each experiment is finished, and the average value of the results of the two experiments is taken as the erosion corrosion rate.
9. The liquid-solid two-phase flow pipeline erosion corrosion test device according to claim 6 or 8, wherein the weight loss-corrosion morphology test and the electrochemical test are separately and independently performed; the test conditions and the steps of the two are the same, except that when an electrochemical test experiment is carried out, the erosion corrosion time of each group of experiments is controlled according to the experiment requirements, a three-electrode system is adopted, a multi-channel electrochemical workstation is connected with the experiment sample of the test bent pipe, and the electrochemical corrosion characteristics including open-circuit potential, a polarization curve and an impedance spectrum at different positions are tested at the same time; and analyzing the erosion corrosion mechanism according to the erosion corrosion morphology, the corrosion rate and the electrochemical corrosion characteristics under different working conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110584149.9A CN113324865A (en) | 2021-05-27 | 2021-05-27 | Liquid-solid two-phase flow pipeline erosion corrosion test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110584149.9A CN113324865A (en) | 2021-05-27 | 2021-05-27 | Liquid-solid two-phase flow pipeline erosion corrosion test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113324865A true CN113324865A (en) | 2021-08-31 |
Family
ID=77421672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110584149.9A Pending CN113324865A (en) | 2021-05-27 | 2021-05-27 | Liquid-solid two-phase flow pipeline erosion corrosion test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113324865A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264566A (en) * | 2021-12-27 | 2022-04-01 | 广东省科学院工业分析检测中心 | Pipeline erosion corrosion test method and device |
| CN114324128A (en) * | 2021-12-06 | 2022-04-12 | 洛阳理工学院 | Corrosion test device and method for simulating real working condition of heat exchanger elbow |
| CN114935536A (en) * | 2022-04-28 | 2022-08-23 | 武汉工程大学 | Dynamic in-situ electrochemical test experimental device for pipe section with pressure variable diameter |
| CN115076613A (en) * | 2022-06-28 | 2022-09-20 | 中国石油大学(北京) | Pipeline erosion corrosion monitoring method, device, equipment and storage medium |
| CN115540959A (en) * | 2022-10-21 | 2022-12-30 | 成都洋湃科技有限公司 | Mixed phase flow measuring method based on liquid-solid two-phase pressure taking and mixed phase flow meter |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009008628A (en) * | 2007-06-29 | 2009-01-15 | Mayekawa Mfg Co Ltd | Method for measuring concentration of solid-liquid two-phase fluid |
| CN103674822A (en) * | 2013-11-29 | 2014-03-26 | 陕西延长石油(集团)有限责任公司研究院 | Gas and liquid two-phase flow loop corrosion experiment device |
| CA2795584A1 (en) * | 2012-11-06 | 2014-05-06 | Cheng, Yufeng (Frank) | An impingement jet test rig for measurements of erosion-corrosion of metals |
| CN104634684A (en) * | 2015-01-27 | 2015-05-20 | 中国石油大学(华东) | Testing system for scouring corrosion of bending pipe and testing method |
| CN107328707A (en) * | 2017-07-06 | 2017-11-07 | 西南石油大学 | The method of testing and device of a kind of HTHP erosion corrosion velocity component |
| CN109883813A (en) * | 2019-01-25 | 2019-06-14 | 西安石油大学 | Elbow corrosive wear electrochemistry synchronous test system under difference impact state |
| CN110987702A (en) * | 2019-12-20 | 2020-04-10 | 常州大学 | Experimental device and test method for simulating geothermal wellbore erosion corrosion under sand-containing condition |
| CN111143982A (en) * | 2019-12-19 | 2020-05-12 | 西安交通大学 | Particle erosion resistance optimization method for turbine mechanical blade flow passage structure |
| CN111141630A (en) * | 2018-11-05 | 2020-05-12 | 天津大学 | Device for detecting erosion corrosion of reducing pipe and detection method thereof |
-
2021
- 2021-05-27 CN CN202110584149.9A patent/CN113324865A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009008628A (en) * | 2007-06-29 | 2009-01-15 | Mayekawa Mfg Co Ltd | Method for measuring concentration of solid-liquid two-phase fluid |
| CA2795584A1 (en) * | 2012-11-06 | 2014-05-06 | Cheng, Yufeng (Frank) | An impingement jet test rig for measurements of erosion-corrosion of metals |
| CN103674822A (en) * | 2013-11-29 | 2014-03-26 | 陕西延长石油(集团)有限责任公司研究院 | Gas and liquid two-phase flow loop corrosion experiment device |
| CN104634684A (en) * | 2015-01-27 | 2015-05-20 | 中国石油大学(华东) | Testing system for scouring corrosion of bending pipe and testing method |
| CN107328707A (en) * | 2017-07-06 | 2017-11-07 | 西南石油大学 | The method of testing and device of a kind of HTHP erosion corrosion velocity component |
| CN111141630A (en) * | 2018-11-05 | 2020-05-12 | 天津大学 | Device for detecting erosion corrosion of reducing pipe and detection method thereof |
| CN109883813A (en) * | 2019-01-25 | 2019-06-14 | 西安石油大学 | Elbow corrosive wear electrochemistry synchronous test system under difference impact state |
| CN111143982A (en) * | 2019-12-19 | 2020-05-12 | 西安交通大学 | Particle erosion resistance optimization method for turbine mechanical blade flow passage structure |
| CN110987702A (en) * | 2019-12-20 | 2020-04-10 | 常州大学 | Experimental device and test method for simulating geothermal wellbore erosion corrosion under sand-containing condition |
Non-Patent Citations (3)
| Title |
|---|
| LIANG LIANG ，YOUXIA PANG: "《Influencing factors of various combinations of abrasion, cavitation, and corrosion caused by multiphase flow impact》", 《TRANSACTIONS OF THE CANADIAN SOCIETY FOR MECHANICAL ENGINEERING》 * |
| 孙强: "《振动环境下管道内海水-冰晶两相流流动与磨蚀特性研究》", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 彭文山: "《含固体颗粒多相流弯管冲蚀机理研究》", 《中国博士学位论文全文数据库 工程科技Ⅰ辑》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324128A (en) * | 2021-12-06 | 2022-04-12 | 洛阳理工学院 | Corrosion test device and method for simulating real working condition of heat exchanger elbow |
| CN114324128B (en) * | 2021-12-06 | 2023-10-17 | 洛阳理工学院 | Corrosion test device and method for simulating actual working condition of bent pipe of heat exchanger |
| CN114264566A (en) * | 2021-12-27 | 2022-04-01 | 广东省科学院工业分析检测中心 | Pipeline erosion corrosion test method and device |
| CN114935536A (en) * | 2022-04-28 | 2022-08-23 | 武汉工程大学 | Dynamic in-situ electrochemical test experimental device for pipe section with pressure variable diameter |
| CN115076613A (en) * | 2022-06-28 | 2022-09-20 | 中国石油大学(北京) | Pipeline erosion corrosion monitoring method, device, equipment and storage medium |
| CN115076613B (en) * | 2022-06-28 | 2023-08-25 | 中国石油大学(北京) | Method, device, equipment and storage medium for monitoring erosion corrosion of pipeline |
| CN115540959A (en) * | 2022-10-21 | 2022-12-30 | 成都洋湃科技有限公司 | Mixed phase flow measuring method based on liquid-solid two-phase pressure taking and mixed phase flow meter |
| CN115540959B (en) * | 2022-10-21 | 2023-09-15 | 成都洋湃科技有限公司 | Mixed phase flow measurement method based on liquid-solid two-phase pressure taking and mixed phase flowmeter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113324865A (en) | Liquid-solid two-phase flow pipeline erosion corrosion test device | |
| CN110887757A (en) | Gas-liquid-solid multiphase flow pipeline erosion experimental device and testing method thereof | |
| Elkholy | Prediction of abrasion wear for slurry pump materials | |
| CN105866018B (en) | Experimental rig and method for evaluating oil-gas pipeline erosion corrosion under high flow rate | |
| CN201594066U (en) | Simulated petrochemical pipeline erosion-corrosion monitoring test device | |
| Grewal et al. | Design and development of high-velocity slurry erosion test rig using CFD | |
| CN110160902B (en) | Detachable annular gas-liquid-solid erosive wear combined test device | |
| CN109612922B (en) | Test device and test method for simulating marine propeller service environment corrosion | |
| CN101975744A (en) | Erosion corrosion test device of seawater piping system metal member | |
| CN210639042U (en) | Detachable loop type gas-liquid-solid erosion-wear combined test device | |
| CN213022232U (en) | Experimental table capable of measuring water hammer pressure wave velocity of different pipes under multiple working conditions | |
| CN111323323A (en) | Seawater-ice crystal flow two-phase flow pipeline erosion corrosion experimental device | |
| Wang et al. | Investigation of the effects of small flow rate and particle impact on high temperature CO2 corrosion of N80 steel | |
| Zahedi et al. | Experimental investigation of flow behavior in a bend and sand erosion pattern under single-phase and multiphase flow conditions | |
| Shang et al. | Erosion-corrosion and its mitigation on the internal surface of the expansion segment of N80 steel tube | |
| Rao et al. | Erosion‐Corrosion of Materials in Industrial Equipment: A Review | |
| Lin et al. | Study on corrosion perforation behavior of copper nickel alloy pipe during service in marine environment | |
| CN112213220B (en) | Device and method for measuring erosion and friction coefficient of sand-containing hydrate slurry to pipeline | |
| Othayq et al. | Experimental study of the effect of particle size on erosion of elbows in series for annular gas-liquid flows | |
| Rajkumar et al. | Sand Erosion Measurements and Simulations Under Churn Flow Conditions in Elbows in Series | |
| Haider et al. | The Effects of Particle Size on Solid Particle Erosion of Elbows in Low Liquid and Annular Multiphase Flows | |
| Li et al. | The effect of flowing velocity and impact angle on the fluid-accelerated corrosion of X65 pipeline steel in a wet gas environment containing CO 2 | |
| Erfan et al. | Erosion-corrosion behavior of AA 6066 aluminum alloy | |
| CN201945545U (en) | Erosion corrosion test device for metal components in sea water piping system | |
| CN205749233U (en) | For evaluating oil and gas pipes assay device of erosion corrosion under high flow rate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210831 |