CN115076613A - Pipeline erosion corrosion monitoring method, device, equipment and storage medium - Google Patents
Pipeline erosion corrosion monitoring method, device, equipment and storage medium Download PDFInfo
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- CN115076613A CN115076613A CN202210741303.3A CN202210741303A CN115076613A CN 115076613 A CN115076613 A CN 115076613A CN 202210741303 A CN202210741303 A CN 202210741303A CN 115076613 A CN115076613 A CN 115076613A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a method for monitoring erosion corrosion of a pipeline, which comprises the following steps: obtaining the flow characteristics, particle concentration and distribution corresponding to each flow state pipe section of the target pipeline; measuring erosion corrosion characteristics of the bent pipe section under the corresponding flow characteristics and the particle concentration and distribution state by using an array electrode method; measuring the erosion corrosion characteristics of the horizontal pipe section under the corresponding flow characteristics and the particle concentration and distribution state by utilizing an erosion corrosion monitoring probe; measuring erosion corrosion characteristics of the jet flow pipe section under the corresponding flow characteristics, particle concentration and distribution states by combining a polarization curve and an electrochemical noise method; and determining the dynamic change information of the corrosion interface of the target pipeline by combining the respective corresponding erosion corrosion characteristics of each flow state pipe section. The invention reduces the deviation between the detection result and the actual erosion corrosion condition of the material and improves the measurement accuracy. The invention also discloses a device, equipment and a storage medium, which have corresponding technical effects.
Description
Technical Field
The invention relates to the field, in particular to a method, a device and equipment for monitoring erosion corrosion of a pipeline and a computer readable storage medium.
Background
The long-distance pipeline is often accompanied by sand grains for conveying petroleum, and the long-term use of the pipeline can cause perforation of the pipeline, petroleum leakage, damage to ocean and land resources and serious creation to the ecological environment. In thermal transport systems and chemical systems, turbulent flow is created in the presence of corrosive fluids and solid suspensions under high flow conditions, and surface materials are removed in the event of fluid erosion and mechanical wear of the solids, causing premature failure of the materials. Researches show that the pipeline conveying systems have thinning conditions of different degrees, wherein the most serious is at elbow parts, pipeline joints, pumps and other parts.
The existing pipeline erosion corrosion detection in multiphase flow mainly focuses on researching single action (mechanical wear or chemical corrosion) of material wear and corrosion research or simple superposition of the two in multiphase flow. The industrial working condition is simulated by controlling different experimental parameters such as injection quantity, impact angle, impact speed, granularity and the like, and the mechanism of erosion corrosion is analyzed by technical means such as a scanning electron microscope, XRD (Diffraction of X-ray Diffraction), EDS (Energy Dispersive Spectroscopy) and the like. The deviation from the actual erosion corrosion condition of the material is large, and the measurement accuracy is low.
In summary, how to effectively solve the problems of the existing pipeline erosion corrosion detection method that the deviation between the detection result and the actual erosion corrosion condition of the material is large and the measurement accuracy is low is a problem that needs to be solved urgently by a person skilled in the art at present.
Disclosure of Invention
The invention aims to provide a pipeline erosion corrosion monitoring method, which reduces the deviation between a detection result and the actual erosion corrosion condition of a material and improves the measurement accuracy; it is another object of the invention to provide an apparatus, a device and a computer readable storage medium.
In order to solve the technical problems, the invention provides the following technical scheme:
a method of monitoring erosion corrosion of a pipeline, comprising:
obtaining the flow characteristics, particle concentration and distribution corresponding to each flow state pipe section of the target pipeline; wherein each flow state pipe section comprises a bending pipe section, a horizontal pipe section and a jet flow pipe section;
measuring erosion corrosion characteristics of the bent pipe section under the corresponding flow characteristics and the particle concentration and distribution state by using an array electrode method;
measuring the erosion corrosion characteristics of the horizontal pipe section under the corresponding flow characteristics and the particle concentration and distribution state by utilizing an erosion corrosion monitoring probe;
measuring erosion corrosion characteristics of the jet flow pipe section under corresponding flow characteristics, particle concentration and distribution states by combining a polarization curve and an electrochemical noise method;
and determining the dynamic change information of the corrosion interface of the target pipeline by combining the erosion corrosion characteristics corresponding to each flow state pipe section.
In one embodiment of the present invention, acquiring the flow characteristics and the particle concentration and distribution corresponding to each flow-state pipe segment of the target pipeline includes:
when solid-liquid two-phase flow flows in the target pipeline, acquiring particle position images respectively corresponding to each flow state pipe section in the target pipeline according to a preset frame frequency;
determining the flow characteristics corresponding to the flow state pipe sections according to the particle position images;
measuring a real-time image of a preset section in the target pipeline by using a tomography system;
and image creation is carried out according to the real-time image to obtain the particle concentration and distribution respectively corresponding to each flow state pipe section.
In an embodiment of the present invention, determining a flow characteristic corresponding to each of the flow regime pipe segments according to each of the particle position images includes:
determining a particle motion speed and a first particle motion track according to each particle position image;
and determining the flow characteristics corresponding to the flow state pipe sections respectively according to the particle movement speed and the first particle movement track.
In one embodiment of the present invention, the method further comprises:
respectively carrying out numerical simulation on each flow state pipe section by using a large-vortex simulation coupling Lagrange particle tracking orbit model to obtain a second particle motion trajectory;
determining a particle motion velocity and a first particle motion trajectory from each of the particle position images, comprising:
determining the particle movement speed according to each particle position image;
determining the flow characteristics corresponding to the flow state pipe sections respectively according to the particle movement speed and the first particle movement track, wherein the flow characteristics comprise:
and determining the flow characteristics corresponding to the flow state pipe sections respectively according to the particle movement speed and the second particle movement track.
In an embodiment of the present invention, after obtaining the second particle motion trajectory, the method further includes:
determining the collision speed and the collision angle of the particles in the jet flow pipe section and the wall surface according to the second particle motion track;
determining erosion corrosion morphological characteristics according to the collision speed and the collision angle;
determining the change of the flow characteristics according to the erosion corrosion morphology characteristics;
and determining the correlation between the turbulence vorticity and the particle movement according to the flow characteristic change.
In a specific embodiment of the present invention, after obtaining the flow characteristics, the particle concentration and the particle distribution corresponding to each flow-state pipe section of the target pipeline, and before determining the dynamic change information of the corrosion interface of the target pipeline by combining the erosion corrosion characteristics corresponding to each flow-state pipe section, the method further includes:
measuring the electrochemical impedance of the sample wafer arranged on each flow-state pipe section by using a three-electrode system in an electrochemical workstation;
and determining the erosion corrosion characteristics of each flow state pipe section under the corresponding flow characteristics and the particle concentration and distribution states according to each electrochemical impedance.
In an embodiment of the present invention, after determining the dynamic change information of the corrosion interface of the target pipe, the method further includes:
and respectively carrying out corresponding material selection and parameter setting on each flow state pipe section according to the dynamic change information of the corrosion interface.
A scour corrosion monitoring apparatus for a pipeline comprising:
the characteristic, concentration and distribution acquisition module is used for acquiring the flow characteristics and the particle concentration and distribution which correspond to each flow state pipe section of the target pipeline respectively; wherein each flow state pipe section comprises a bending pipe section, a horizontal pipe section and a jet flow pipe section;
the bent pipe section characteristic measuring module is used for measuring the erosion corrosion characteristics of the bent pipe section under the corresponding flow characteristics and the particle concentration and distribution state by using an array electrode method;
the horizontal pipe section characteristic measuring module is used for measuring the erosion corrosion characteristics of the horizontal pipe section under the corresponding flow characteristics and the particle concentration and distribution state by utilizing the erosion corrosion monitoring probe;
the jet flow pipe section characteristic measuring module is used for measuring the erosion corrosion characteristics of the jet flow pipe section under the corresponding flow characteristics and the particle concentration and distribution state by combining a polarization curve and an electrochemical noise method;
and the dynamic change information determination module is used for determining the dynamic change information of the corrosion interface of the target pipeline by combining the erosion corrosion characteristics corresponding to each flow state pipe section.
A scour corrosion monitoring apparatus for a pipeline comprising:
a memory for storing a computer program;
and the processor is used for realizing the steps of the pipeline erosion corrosion monitoring method when the computer program is executed.
A computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for scour corrosion monitoring of a pipeline as set forth above.
The pipeline erosion corrosion monitoring method provided by the invention obtains the flow characteristics, particle concentration and distribution respectively corresponding to each flow state pipe section of the target pipeline; wherein each flow state pipe section comprises a bending pipe section, a horizontal pipe section and a jet flow pipe section; measuring erosion corrosion characteristics of the bent pipe section under the corresponding flow characteristics and the particle concentration and distribution state by using an array electrode method; measuring the erosion corrosion characteristics of the horizontal pipe section under the corresponding flow characteristics and the particle concentration and distribution state by utilizing an erosion corrosion monitoring probe; measuring erosion corrosion characteristics of the jet flow pipe section under the corresponding flow characteristics and the particle concentration and distribution state by combining a polarization curve and an electrochemical noise method; and determining the dynamic change information of the corrosion interface of the target pipeline by combining the respective corresponding erosion corrosion characteristics of each flow state pipe section.
According to the technical scheme, the flow characteristics, the particle concentration and the particle distribution of the bent pipe section, the horizontal pipe section and the jet flow pipe section in the target pipeline are respectively obtained. Under the flow characteristics and the particle concentration and distribution states corresponding to the flow state pipe sections respectively, the erosion corrosion characteristics of the bent pipe sections are measured by an array electrode method, the erosion corrosion characteristics of the horizontal pipe sections are measured by erosion corrosion monitoring probes, and the erosion corrosion characteristics of the jet flow pipe sections are measured by combining a polarization curve and an electrochemical noise method. And determining the dynamic change information of the corrosion interface of the target pipeline by combining the erosion corrosion characteristics corresponding to each flow state pipe section. The measuring advantages of each measuring method to the corresponding flow state pipe section are fully utilized, the deviation between the pipeline erosion corrosion detection method and the actual erosion corrosion condition of the material is reduced, and the measuring accuracy is improved.
Correspondingly, the invention also provides a pipeline erosion corrosion monitoring device, equipment and a computer readable storage medium corresponding to the pipeline erosion corrosion monitoring method, which have the technical effects and are not described herein again.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of an embodiment of a method for monitoring erosion corrosion of a pipeline according to the present invention;
FIG. 2 is a flow chart of another embodiment of a method for monitoring erosion corrosion of a pipeline according to the present invention;
FIG. 3 is a flow chart of another embodiment of a method for monitoring erosion corrosion of a pipeline according to the present invention;
FIG. 4 is a flow chart of another embodiment of a method for monitoring erosion corrosion of a pipeline according to the present invention;
FIG. 5 is a block diagram of a erosion monitoring apparatus for pipelines according to an embodiment of the present invention;
FIG. 6 is a block diagram of a pipeline erosion monitoring apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a pipeline erosion corrosion monitoring apparatus according to this embodiment.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of an implementation of a method for monitoring erosion corrosion of a pipeline according to an embodiment of the present invention, where the method may include the following steps:
s101: and obtaining the flow characteristics, the particle concentration and the particle distribution which correspond to each flow state pipe section of the target pipeline respectively.
Wherein each flow state pipe section comprises a bending pipe section, a horizontal pipe section and a jet flow pipe section.
The pipeline comprises a curved pipe section, a horizontal pipe section and a jet pipe section. The liquid in the pipeline is inevitably mixed with some solid impurities in the flowing process, such as sand grains which are often accompanied in the oil pipeline. And when the solid-liquid two-phase flow flows in the target pipeline, obtaining the flow characteristics, the particle concentration and the particle distribution which respectively correspond to each flow state pipe section of the target pipeline. For example, the flow characteristics and particle concentration and distribution corresponding to each flow regime pipe segment can be analyzed by means of continuous image acquisition.
The target pipeline may be any one of the pipelines to be monitored for erosion corrosion.
S102: and measuring the erosion corrosion characteristics of the bent pipe section under the corresponding flow characteristics and the particle concentration and distribution state by using an array electrode method.
After the flow characteristics and the particle concentration and distribution corresponding to the bent pipe section of the target pipeline are obtained, erosion corrosion characteristics of the bent pipe section in the corresponding flow characteristics and the particle concentration and distribution state are measured by using an array electrode method.
The erosion corrosion characteristic measuring process of the bent pipe section by utilizing the array electrode method can comprise the steps of distributing array electrodes at different angles and different inner and outer sides of the bent pipe in advance, applying the same electric signal to the coupled single electrode array, measuring the coupling potential and current distribution on each electrode, comparing erosion corrosion on the inner wall and the outer wall of the bent pipe, dividing cathode and anode areas, and analyzing position change of an electrochemical area caused by different particle-wall surface collision in the liquid-solid two-phase flow flowing process. And then obtaining the erosion corrosion characteristics of the bent pipe section under different working conditions (flow speed, particle concentration, particle size, particle shape, fluid pH value and the like).
Scouring and corroding: damage to the material caused by corrosive fluids and solid particles flowing at high speed.
Array electrode: the corrosion electrochemical data are monitored by arranging a plurality of electrodes at the position of the pipeline elbow.
S103: and measuring the erosion corrosion characteristics of the horizontal pipe section in the corresponding flow characteristics and particle concentration and distribution states by utilizing the erosion corrosion monitoring probe.
After the flow characteristics and the particle concentration and distribution corresponding to the horizontal pipe section of the target pipeline are obtained, the erosion corrosion monitoring probe is used for measuring the erosion corrosion characteristics of the horizontal pipe section in the corresponding flow characteristics and the particle concentration and distribution state.
The process of measuring the erosion corrosion characteristics of the horizontal pipe section by using the erosion corrosion monitoring probe can comprise the steps of setting a preset number (such as 4) of probes with the same number in the horizontal pipe section in advance, applying constant voltage on the probes, sensing by using a probe internal resistance sensor in real time when particles collide with the probes, storing data and analyzing signals by using a single chip microcomputer, and acquiring material wear information in real time based on the rising condition after measuring the erosion corrosion of internal resistance of the single chip microcomputer. And measuring the particle distribution and the wall surface abrasion distribution of the horizontal pipe section in the liquid-solid two-phase flow, and recording the position collision point and the corrosion potential of the particles and the probe in real time. Under the conditions of different particle concentrations, particle sizes, shapes and the like of the liquid-solid two-phase flow, the erosion corrosion monitoring probe is applied to measure the material abrasion-corrosion condition in the horizontal pipeline.
S104: and measuring the erosion corrosion characteristics of the jet flow pipe section under the corresponding flow characteristics and the particle concentration and distribution state by combining a polarization curve and an electrochemical noise method.
After the flow characteristics corresponding to the jet flow pipe section of the target pipeline and the particle concentration and distribution are obtained, the erosion corrosion characteristics of the jet flow pipe section in the corresponding flow characteristics and the particle concentration and distribution state are measured by combining a polarization curve and an electrochemical noise method.
The erosion corrosion characteristic measurement process of the jet flow pipe section by combining the polarization curve and the electrochemical noise method can comprise the steps of measuring the polarization curve of a sample wafer of the jet flow pipe section in a target pipeline in the erosion corrosion process by using an electrochemical workstation (such as a Garmy electrochemical workstation) through a three-electrode system, cooperating with the electrochemical noise, wherein the sample wafer in the three-electrode system is a working electrode, a saturated calomel electrode is a reference electrode, and a platinum electrode is a counter electrode, firstly testing the open-circuit potential of the sample wafer, applying different potential ranges based on the self-corrosion potential to scan after stabilization, and obtaining the current densities at different potentials so as to obtain the polarization curve. The electrochemical noise three-electrode system adopts two sample wafers made of the same material as a working electrode and a counter electrode respectively, a saturated calomel electrode is used as the counter electrode, a ZRA (Zero Resistance Ammeter) mode test is selected, the scanning frequency is set to be 0.1-1000Hz, the filter precision is selected to be 0.1%, the potential and current range are selected according to a test system, and the electrochemical noise image can be obtained through the test. And (3) monitoring the dynamic process of the two-phase jet erosion corrosion on line to obtain parameters such as a corrosion potential, a pitting potential, a Vicat current density and the like, and further analyzing to obtain the corrosion characteristics of the erosion corrosion of the material.
Electrochemical noise: in the evolution process of the electrochemical power system, the random unbalanced fluctuation phenomenon of the electrical state parameters is generated.
Polarization curve: the relationship between electrode potential and polarization current or polarization current density.
S105: and determining the dynamic change information of the corrosion interface of the target pipeline by combining the respective corresponding erosion corrosion characteristics of each flow state pipe section.
After the erosion corrosion characteristics of the bent pipe section, the horizontal pipe section and the jet pipe section in the corresponding flow characteristics and the particle concentration and distribution state are respectively measured, the erosion corrosion characteristics respectively corresponding to each flow state pipe section are combined to determine the dynamic change information of the corrosion interface of the target pipeline, so that the dynamic action mechanism of the multiphase flow and the erosion corrosion is obtained.
In an embodiment of the present invention, after determining the information about the dynamic change of the corrosion interface of the target pipeline, the method may further include the following steps:
and respectively carrying out corresponding material selection and parameter setting on each flow state pipe section according to the dynamic change information of the corrosion interface.
After the corrosion interface dynamic change information of the target pipeline is determined, corresponding material selection and parameter setting are respectively carried out on each flow state pipeline section according to the corrosion interface dynamic change information. For example, materials with corresponding corrosion wear tolerance are respectively selected for each flow state pipe section according to the corrosion wear degree of the inner wall of each flow state pipe section of the target pipeline, namely, the material with high relative corrosion wear tolerance is selected for the flow state pipe section with high corrosion wear degree, the material with low relative corrosion wear tolerance is selected for the flow state pipe section with low corrosion wear degree, and parameters such as flow speed, impact angle, impact speed and the like of fluid in the target pipeline are set, so that the cost is saved while the whole service life of the pipeline is ensured.
According to the technical scheme, the flow characteristics, the particle concentration and the particle distribution of the bent pipe section, the horizontal pipe section and the jet flow pipe section in the target pipeline are respectively obtained. Under the flow characteristics and the particle concentration and distribution states corresponding to the flow state pipe sections respectively, the erosion corrosion characteristics of the bent pipe sections are measured by an array electrode method, the erosion corrosion characteristics of the horizontal pipe sections are measured by erosion corrosion monitoring probes, and the erosion corrosion characteristics of the jet flow pipe sections are measured by combining a polarization curve and an electrochemical noise method. And determining the dynamic change information of the corrosion interface of the target pipeline by combining the erosion corrosion characteristics corresponding to each flow state pipe section. The measuring advantages of each measuring method to the corresponding flow state pipe section are fully utilized, the deviation between the pipeline erosion corrosion detection method and the actual erosion corrosion condition of the material is reduced, and the measuring accuracy is improved.
It should be noted that, based on the above embodiments, the embodiments of the present invention also provide corresponding improvements. In the following embodiments, steps that are the same as or correspond to those in the above embodiments may be referred to one another, and corresponding advantageous effects may also be referred to one another, which is not described in detail in the following modified embodiments.
Referring to fig. 2, fig. 2 is a flowchart of another implementation of the method for monitoring erosion corrosion of a pipeline according to an embodiment of the present invention, where the method may include the following steps:
s201: when the solid-liquid two-phase flow flows in the target pipeline, particle position images corresponding to each flow state pipe section in the target pipeline are obtained according to a preset frame frequency.
Wherein each flow state pipe section comprises a bending pipe section, a horizontal pipe section and a jet flow pipe section.
And presetting an image shooting frame frequency, and when the solid-liquid two-phase flow flows in the target pipeline, acquiring particle position images respectively corresponding to each flow state pipe section in the target pipeline according to the preset frame frequency. If shooting is carried out by adopting a high-speed camera, the high-speed camera can shoot images at the speed of 4000 frames per second at most, and the high-speed camera is arranged at a proper shooting position.
In order to facilitate the measurement of a high-speed camera system, the measurement part of the liquid-solid two-phase flow experiment system is made of transparent organic glass materials, the experiment sample is made of metal materials, and the sample is fixed in a pipeline in a groove invagination mode.
S202: and determining the flow characteristics corresponding to the flow state pipe sections according to the particle position images.
After the particle position images corresponding to the flow state pipe sections in the target pipeline are obtained, the flow characteristics corresponding to the flow state pipe sections are determined according to the particle position images. For example, the particle position images can be transmitted to a computer through a network data line, and the stored images are led into PTV analysis software for processing, wherein the PTV analysis software is used for comparing the positions of the particles in each frame of image to derive the movement speed and the track of the particles at each moment so as to obtain the flow characteristics under different flow state pipe sections (including a bent pipe section, a horizontal pipe section and a jet flow pipe section), particularly the collision behavior of the particles with the wall surface.
In a specific embodiment of the present invention, step S202 may include the following steps:
the method comprises the following steps: determining a particle motion speed and a first particle motion track according to each particle position image;
step two: and determining the flow characteristics corresponding to each flow state pipe section according to the particle motion speed and the first particle motion track.
For convenience of description, the above two steps may be combined for illustration.
After the particle position images corresponding to the flow state pipe sections in the target pipeline are obtained, the particle motion speed and the first particle motion track are determined according to the particle position images, and the flow characteristics corresponding to the flow state pipe sections are determined according to the particle motion speed and the first particle motion track. Therefore, the action condition of the impurity particles on each flow state pipe section can be intuitively obtained.
S203: and measuring a real-time image of a preset section in the target pipeline by using a tomography system.
And (3) presetting a tomography system, and measuring a real-time image of a preset section in the target pipeline by using the tomography system.
It should be noted that the preset cross section may be set and adjusted according to actual situations, which is not limited in the embodiment of the present invention.
Tomography systems use specially made devices for non-invasive measurements.
S204: and (4) image creation is carried out according to the real-time image to obtain the particle concentration and distribution respectively corresponding to each flow state pipe section.
After a tomography system is used for measuring a real-time image of a preset section in a target pipeline, image creation is carried out according to the real-time image, and the particle concentration and distribution respectively corresponding to each flow state pipe section are obtained. After a tomography system is adopted to measure an intuitive real-time image of a preset section of a target pipeline, a computer processes data information on the real-time image to reconstruct an image, namely the concentration and the distribution of particles corresponding to each flow state pipe section in liquid-solid two-phase flow.
S205: and measuring the erosion corrosion characteristics of the bent pipe section under the corresponding flow characteristics and the particle concentration and distribution state by using an array electrode method.
S206: and measuring the erosion corrosion characteristics of the horizontal pipe section in the corresponding flow characteristics and particle concentration and distribution states by utilizing the erosion corrosion monitoring probe.
S207: and measuring the erosion corrosion characteristics of the jet flow pipe section under the corresponding flow characteristics and the particle concentration and distribution state by combining a polarization curve and an electrochemical noise method.
S208: and determining the dynamic change information of the corrosion interface of the target pipeline by combining the respective corresponding erosion corrosion characteristics of each flow state pipe section.
Referring to fig. 3, fig. 3 is a flowchart of another implementation of the method for monitoring erosion corrosion of a pipeline according to an embodiment of the present invention, where the method may include the following steps:
s301: when the solid-liquid two-phase flow flows in the target pipeline, particle position images corresponding to each flow state pipe section in the target pipeline are obtained according to a preset frame frequency.
S302: and respectively carrying out numerical simulation on each flow state pipe section by using a large-vortex simulation coupling Lagrange particle tracking orbit model to obtain a second particle motion trajectory.
And presetting a coupled Lagrange particle tracking orbit model, and performing numerical simulation on each flow state pipe section by using the large-vortex simulation coupled Lagrange particle tracking orbit model to obtain a second particle motion track.
Adopting a large-vortex simulation coupled Lagrange particle tracking orbit model, performing numerical calculation on a flow field of an impact jet by using a vortex simulation (LES) method, and assuming that the fluid is incompressible fluid and Newtonian fluid, and adopting a continuity equation and an N-S equation:
wherein, tau ij Is a sub-lattice stress term in m -1 s -1 (ii) a p is pressure, in Pa; u. of i Is a component of velocity, in m · s -1 (ii) a v is kinematic viscosity in m 2 s -1 (ii) a t is time, unit s; f. of i As external force, in m.s -2 (ii) a Rho is the density of the fluid in kg.m -3 。
Sub-lattice stress term τ ij Representing the momentum exchange between the large scale pulse and the small scale pulse obtained after filtering, and a sub-lattice stress term tau ij Can be expressed as:
the discrete phase adopts a Lagrange point particle tracking method, utilizes a random tracking scheme in a Lagrange reference system, and numerically calculates the sand particle trajectory by using gradual integration on a time step. To simplify the analysis, the following assumptions were made: the flow of particles is dilute; the interaction between the particles is negligible; the flow field and the particles are unidirectionally coupled, namely the influence of the particles on the fluid is ignored; all particles are rigid spheres of the same diameter and density; the particle-wall collision process is calculated according to a particle rebound model. The lagrangian motion of rigid spherical particles suspended in a flow is governed by the force balance equation as follows:
wherein the content of the first and second substances,
is the drag vector, in units of N;
is a Saffman lift vector in N;
is the pressure gradient force vector, in units of N;
is a gravity vector, in units of N;
local velocity vectors of the particles, N, respectively; m is a unit of p Is the mass of the granules, kg.
According to experimental design, numerical simulation is carried out on the bent pipe, the horizontal pipe and the jet flow, and the particle motion trail under different flow characteristics (such as secondary flow and near-wall surface vortex group) is obtained.
Large vortex simulation: the method is characterized in that the space averaging of turbulent pulsation (or turbulent vortex) is realized, namely a large-scale vortex and a small-scale vortex are separated through a certain filtering function, the large-scale vortex is directly simulated, and the small-scale vortex is closed by a model.
Lagrange method: the change rule of motion parameters (position coordinates, speed, acceleration and the like) of each particle of the fluid along with time. And the motion law of the whole fluid is obtained by integrating the changes of all fluid particle motion parameters.
Secondary flow: an offset parallel to the boundary is created, which is a flow of water superimposed on the main flow. One flow (main flow) causes another flow of different nature.
In an embodiment of the present invention, after obtaining the second particle motion trajectory, the method may further include the steps of:
the method comprises the following steps: determining the collision speed and the collision angle of the particles in the jet flow pipe section and the wall surface according to the second particle motion track;
step two: determining erosion corrosion morphology characteristics according to the collision speed and the collision angle;
step three: determining the change of the flow characteristics according to the erosion corrosion morphology characteristics;
step four: and determining the correlation between the turbulence vorticity and the particle motion according to the flow characteristic change.
For convenience of description, the above four steps may be combined for illustration.
Determining the collision speed and the collision angle of the particles in the jet flow pipe section and the wall surface according to the second particle motion track, determining the erosion corrosion morphology characteristics according to the collision speed and the collision angle, determining the flow characteristic change according to the erosion corrosion morphology characteristics, and determining the incidence relation between the turbulence vorticity and the particle motion according to the flow characteristic change.
Through counting particle-wall collision speed and collision angle, especially flow characteristic change after forming W and U-shaped appearance characteristics according to erosion corrosion, the influence of turbulence vorticity after flow change on particle motion is analyzed.
Turbulent flow: under high flow velocity, a plurality of small eddies exist in a flow field, laminar flows are damaged, adjacent flow layers not only slide but also mix, and the fluid does irregular movement at the moment and has partial velocity in the direction vertical to the axis of the flow pipe.
S303: from each particle position image, the particle motion velocity is determined.
And after the particle position images respectively corresponding to all flow state pipe sections in the target pipeline are obtained, determining the particle movement speed according to all the particle position images. The particle movement speed is determined according to the length and time of the particle flowing in the target pipeline by analyzing the particle positions in the particle position images corresponding to different moments.
S304: and determining the flow characteristics corresponding to each flow state pipe section according to the particle motion speed and the second particle motion track.
And after the particle movement speed and the second particle movement track are determined, determining the flow characteristics corresponding to each flow state pipe section according to the particle movement speed and the second particle movement track.
S305: and measuring a real-time image of a preset section in the target pipeline by using a tomography system.
S306: and (4) image creation is carried out according to the real-time image to obtain the particle concentration and distribution respectively corresponding to each flow state pipe section.
Wherein each flow state pipe section comprises a bending pipe section, a horizontal pipe section and a jet flow pipe section.
S307: and measuring the erosion corrosion characteristics of the bent pipe section under the corresponding flow characteristics and the particle concentration and distribution state by using an array electrode method.
S308: and measuring the erosion corrosion characteristics of the horizontal pipe section in the corresponding flow characteristics and particle concentration and distribution states by utilizing the erosion corrosion monitoring probe.
S309: and measuring the erosion corrosion characteristics of the jet flow pipe section under the corresponding flow characteristics and the particle concentration and distribution state by combining a polarization curve and an electrochemical noise method.
S310: and determining the dynamic change information of the corrosion interface of the target pipeline by combining the respective corresponding erosion corrosion characteristics of each flow state pipe section.
By establishing an online monitoring method of erosion corrosion materials of multi-source electrochemical signals combined with liquid-solid two-phase flow under different flow state pipe sections, the dynamic analysis of real-time flow numerical simulation and particle-wall surface collision at the damaged wall surface is carried out, so that a material erosion corrosion mechanism in the liquid-solid two-phase flow is obtained.
Referring to fig. 4, fig. 4 is a flowchart of another implementation of the method for monitoring erosion corrosion of a pipeline according to an embodiment of the present invention, where the method may include the following steps:
s401: and obtaining the flow characteristics, the particle concentration and the particle distribution which correspond to each flow state pipe section of the target pipeline respectively.
Wherein each flow state pipe section comprises a bending pipe section, a horizontal pipe section and a jet flow pipe section.
S402: and measuring the electrochemical impedance of the sample wafer arranged in each flow state pipe section by using a three-electrode system in the electrochemical workstation.
After the flow characteristics, the particle concentration and the particle distribution corresponding to each flow state pipe section of the target pipeline are obtained, the electrochemical impedance of the sample wafer arranged in each flow state pipe section is measured by using a three-electrode system in an electrochemical workstation.
The corrosion performance of the material after erosion corrosion adopts an Autolab electrochemical workstation to measure the electrochemical impedance of the sample wafer after the experiment by using a three-electrode system, so as to analyze the corrosion characteristics of the damaged part. In the three-electrode system, a sample wafer is a working electrode, a saturated calomel electrode is a reference electrode, a platinum electrode is a counter electrode, and NaCl solution with the mass fraction of 3.5% is selected as electrolyte. The sample is placed in an electrolytic cell and stands for 30min, and the Open Circuit Potential (OCP) and the Impedance value are measured by using an Electrochemical Impedance Spectroscopy module for testing. The frequency range under the corrosion potential is 10000Hz-0.001Hz, the scanning direction is from a high frequency area to a low frequency area, and the amplitude of an alternating current excitation signal during testing is set to be 10 mV. And selecting a proper fitting circuit for fitting, wherein the correct fitting circuit is determined if the error is less than 0.001. Finally, data such as resistance values and phase frequencies of all parts can be obtained through fitting, the dynamic process of the two-phase jet erosion corrosion is monitored on line, and parameters such as corrosion potential, pitting potential, dimensional inert current density and the like are obtained.
Corrosion potential: the potential measured when the metal reaches a stable corrosion state in the absence of an applied current.
Pitting potential: the lowest electrode potential value that can cause pitting on a passive surface.
Maintaining the passive current density: a parameter that directly reflects the corrosion rate of a metal device under anodic protection.
S403: and determining the erosion corrosion characteristics of each flow state pipe section under the corresponding flow characteristics and the particle concentration and distribution state according to each electrochemical impedance.
After the electrochemical impedance of the sample wafer arranged in each flow state pipe section is measured by using a three-electrode system in an electrochemical workstation, the erosion corrosion characteristics of each flow state pipe section in the corresponding flow characteristic and particle concentration and distribution state are determined according to each electrochemical impedance, so that the corrosion condition of the sample wafer is analyzed. And an electronic balance, a metallographic microscope, a scanning electron microscope, a Laser Scanning Microscope (LSM), a hardness tester, an X-ray diffractometer and an X-ray photoelectron spectrometer (XPS) can be respectively applied to measure the weight loss, the surface appearance, the surface microstructure, the surface hardness and the surface material element component analysis of the sample.
Electrical impedance spectroscopy: and the corrosion resistance of the material is analyzed by measuring the change of the impedance along with the frequency of the sine wave.
S404: and determining the dynamic change information of the corrosion interface of the target pipeline by combining the respective corresponding erosion corrosion characteristics of each flow state pipe section.
Corresponding to the above method embodiment, the present invention further provides a pipeline erosion monitoring device, and the pipeline erosion monitoring device described below and the pipeline erosion monitoring device method described above can be referred to correspondingly.
Referring to fig. 5, fig. 5 is a block diagram of a erosion corrosion monitoring apparatus for a pipeline according to an embodiment of the present invention, the apparatus may include:
a characteristic and concentration and distribution obtaining module 51, configured to obtain flow characteristics and particle concentrations and distributions corresponding to flow segments of a target pipeline, respectively; wherein each flow state pipe section comprises a bending pipe section, a horizontal pipe section and a jet flow pipe section;
the curved pipe section characteristic measuring module 52 is used for measuring the erosion corrosion characteristics of the curved pipe section in the corresponding flow characteristics and the particle concentration and distribution state by using an array electrode method;
the horizontal pipe section characteristic measuring module 53 is used for measuring the erosion corrosion characteristics of the horizontal pipe section in the corresponding flow characteristics and particle concentration and distribution states by utilizing the erosion corrosion monitoring probe;
the jet flow pipe section characteristic measuring module 54 is used for measuring the erosion corrosion characteristics of the jet flow pipe section under the corresponding flow characteristics and the particle concentration and distribution state by combining a polarization curve and an electrochemical noise method;
and the dynamic change information determining module 55 is configured to determine dynamic change information of the corrosion interface of the target pipeline by combining the erosion corrosion characteristics corresponding to each flow-state pipe segment.
According to the technical scheme, the flow characteristics, the particle concentration and the particle distribution of the bent pipe section, the horizontal pipe section and the jet flow pipe section in the target pipeline are respectively obtained. Under the flow characteristics and the particle concentration and distribution states corresponding to the flow state pipe sections respectively, the erosion corrosion characteristics of the bent pipe sections are measured by an array electrode method, the erosion corrosion characteristics of the horizontal pipe sections are measured by erosion corrosion monitoring probes, and the erosion corrosion characteristics of the jet flow pipe sections are measured by combining a polarization curve and an electrochemical noise method. And determining the dynamic change information of the corrosion interface of the target pipeline by combining the erosion corrosion characteristics corresponding to each flow state pipe section. The measuring advantages of each measuring method to the corresponding flow state pipe section are fully utilized, the deviation between the pipeline erosion corrosion detection method and the actual erosion corrosion condition of the material is reduced, and the measuring accuracy is improved.
In one embodiment of the present invention, the characteristic and concentration and distribution obtaining module 51 includes:
the position image acquisition submodule is used for acquiring particle position images respectively corresponding to each flow state pipe section in the target pipeline according to a preset frame frequency when the solid-liquid two-phase flow flows in the target pipeline;
the flow characteristic determination submodule is used for determining the flow characteristics corresponding to the flow state pipe sections according to the particle position images;
the real-time image measurement submodule is used for measuring a real-time image of a preset section in the target pipeline by using the tomography system;
and the concentration and distribution obtaining submodule is used for carrying out image creation according to the real-time image to obtain the particle concentration and distribution respectively corresponding to each flow state pipe section.
In one embodiment of the present invention, the flow characteristic determination submodule includes:
the speed and track determining unit is used for determining the movement speed of the particles and the movement track of the first particles according to the position images of the particles;
and the flow characteristic determining unit is used for determining the flow characteristics corresponding to the flow state pipe sections respectively according to the particle motion speed and the first particle motion track.
In one embodiment of the present invention, the apparatus may further include:
the particle motion trajectory acquisition module is used for respectively carrying out numerical simulation on each flow state pipe section by utilizing a large vortex simulation coupling Lagrange particle tracking trajectory model to obtain a second particle motion trajectory;
correspondingly, the speed and track determining unit is a unit for determining the movement speed of the particles according to the position images of the particles;
the flow characteristic determining unit is specifically a unit for determining the flow characteristics corresponding to each flow state pipe section according to the particle movement speed and the second particle movement track.
In an embodiment of the present invention, the apparatus may further include:
the collision angle and speed determining module is used for determining the collision speed and the collision angle between the particles in the jet flow pipe section and the wall surface according to the second particle motion track after the second particle motion track is obtained;
the erosion corrosion topography feature determination module is used for determining erosion corrosion topography features according to the collision speed and the collision angle;
the flow characteristic change determining module is used for determining the change of the flow characteristic according to the erosion corrosion morphology characteristic;
and the incidence relation determining module is used for determining the incidence relation between the turbulence vorticity and the particle movement according to the flow characteristic change.
In one embodiment of the present invention, the apparatus may further include:
the electrochemical impedance measuring module is used for measuring the electrochemical impedance of a sample wafer arranged in each flow state pipe section by using a three-electrode system in an electrochemical workstation before determining the dynamic change information of a corrosion interface of the target pipeline by combining the scouring corrosion characteristics corresponding to each flow state pipe section after acquiring the flow characteristics and the particle concentration and distribution corresponding to each flow state pipe section of the target pipeline;
and the erosion corrosion characteristic determination module is used for determining the erosion corrosion characteristics of each flow state pipe section in the corresponding flow characteristic and particle concentration and distribution state according to each electrochemical impedance.
In accordance with the above method embodiment, referring to fig. 6, fig. 6 is a schematic diagram of a pipeline erosion corrosion monitoring apparatus provided by the present invention, which may include:
a memory 332 for storing a computer program;
a processor 322 for implementing the steps of the method for monitoring erosion corrosion of a pipeline according to the above-mentioned method embodiment when executing the computer program.
Specifically, referring to fig. 7, fig. 7 is a schematic diagram illustrating a specific structure of a pipeline erosion monitoring device provided in this embodiment, the pipeline erosion monitoring device may generate a relatively large difference due to different configurations or performances, and may include a processor (CPU) 322 (for example, one or more processors) and a memory 332, where the memory 332 stores one or more computer application programs 342 or data 344. Memory 332 may be, among other things, transient or persistent storage. The program stored in memory 332 may include one or more modules (not shown), each of which may include a sequence of instructions operating on a data processing device. Further, the processor 322 may be configured to communicate with the memory 332 to execute a series of instruction operations in the memory 332 on the pipeline erosion monitoring device 301.
The pipeline erosion monitoring apparatus 301 can also include one or more power sources 326, one or more wired or wireless network interfaces 350, one or more input-output interfaces 358, and/or one or more operating systems 341.
The steps in the method for monitoring the erosion corrosion of a pipeline described above may be implemented by the structure of the apparatus for monitoring the erosion corrosion of a pipeline.
Corresponding to the above method embodiment, the present invention further provides a computer-readable storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing the steps of:
obtaining the flow characteristics, particle concentration and distribution corresponding to each flow state pipe section of the target pipeline; wherein each flow state pipe section comprises a bending pipe section, a horizontal pipe section and a jet flow pipe section; measuring erosion corrosion characteristics of the bent pipe section under the corresponding flow characteristics and the particle concentration and distribution state by using an array electrode method; measuring the erosion corrosion characteristics of the horizontal pipe section under the corresponding flow characteristics and the particle concentration and distribution state by utilizing an erosion corrosion monitoring probe; measuring erosion corrosion characteristics of the jet flow pipe section under the corresponding flow characteristics and the particle concentration and distribution state by combining a polarization curve and an electrochemical noise method; and determining the dynamic change information of the corrosion interface of the target pipeline by combining the respective corresponding erosion corrosion characteristics of each flow state pipe section.
The computer-readable storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
For the introduction of the computer-readable storage medium provided by the present invention, please refer to the above method embodiments, which are not described herein again.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The apparatuses, devices and computer-readable storage media disclosed in the embodiments correspond to the methods disclosed in the embodiments, so that the description is simple, and the relevant points can be referred to the description of the method.
The principle and the implementation of the present invention are explained in the present application by using specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A method for monitoring erosion corrosion of a pipeline is characterized by comprising the following steps:
obtaining the flow characteristics, particle concentration and distribution corresponding to each flow state pipe section of the target pipeline; wherein each flow state pipe section comprises a bending pipe section, a horizontal pipe section and a jet flow pipe section;
measuring erosion corrosion characteristics of the bent pipe section under the corresponding flow characteristics and the particle concentration and distribution state by using an array electrode method;
measuring the erosion corrosion characteristics of the horizontal pipe section under the corresponding flow characteristics and the particle concentration and distribution state by utilizing an erosion corrosion monitoring probe;
measuring erosion corrosion characteristics of the jet flow pipe section under corresponding flow characteristics, particle concentration and distribution states by combining a polarization curve and an electrochemical noise method;
and determining the dynamic change information of the corrosion interface of the target pipeline by combining the erosion corrosion characteristics corresponding to each flow state pipe section.
2. The method for monitoring erosion corrosion of a pipeline according to claim 1, wherein the obtaining of the flow characteristics and the particle concentration and distribution corresponding to each flow state pipe section of the target pipeline comprises:
when solid-liquid two-phase flow flows in the target pipeline, acquiring particle position images respectively corresponding to each flow state pipe section in the target pipeline according to a preset frame frequency;
determining the flow characteristics corresponding to the flow state pipe sections according to the particle position images;
measuring a real-time image of a preset section in the target pipeline by using a tomography system;
and image creation is carried out according to the real-time image to obtain the particle concentration and distribution respectively corresponding to each flow state pipe section.
3. The method for monitoring erosion corrosion of a pipeline according to claim 2, wherein determining the flow characteristics corresponding to each flow regime pipe segment from each particle position image comprises:
determining a particle motion speed and a first particle motion track according to each particle position image;
and determining the flow characteristics corresponding to the flow state pipe sections respectively according to the particle movement speed and the first particle movement track.
4. The method of monitoring erosion corrosion of a pipeline according to claim 3, further comprising:
respectively carrying out numerical simulation on each flow state pipe section by using a large-vortex simulation coupling Lagrange particle tracking orbit model to obtain a second particle motion trajectory;
determining a particle motion velocity and a first particle motion trajectory from each of the particle position images, comprising:
determining the particle movement speed according to each particle position image;
determining the flow characteristics corresponding to each flow state pipe section according to the particle movement speed and the first particle movement track, wherein the flow characteristics comprise:
and determining the flow characteristics corresponding to the flow state pipe sections respectively according to the particle movement speed and the second particle movement track.
5. The method for monitoring erosion corrosion of a pipeline according to claim 4, further comprising, after obtaining the second particle motion trajectory:
determining the collision speed and the collision angle of the particles in the jet flow pipe section and the wall surface according to the second particle motion track;
determining erosion corrosion morphological characteristics according to the collision speed and the collision angle;
determining the change of the flow characteristics according to the erosion corrosion morphology characteristics;
and determining the correlation between the turbulence vorticity and the particle movement according to the flow characteristic change.
6. The method for monitoring erosion corrosion of a pipeline according to any one of claims 1 to 5, wherein after obtaining the flow characteristics and the particle concentration and distribution corresponding to each flow state pipe section of the target pipeline, and before determining the dynamic change information of the corrosion interface of the target pipeline by combining the erosion corrosion characteristics corresponding to each flow state pipe section, further comprising:
measuring the electrochemical impedance of the sample wafer arranged in each flow state pipe section by using a three-electrode system in an electrochemical workstation;
and determining the erosion corrosion characteristics of each flow state pipe section under the corresponding flow characteristics and the particle concentration and distribution state according to each electrochemical impedance.
7. The method for monitoring erosion corrosion of a pipeline according to claim 1, after determining the information about the dynamic change of the corrosion interface of the target pipeline, further comprising:
and respectively carrying out corresponding material selection and parameter setting on each flow state pipe section according to the dynamic change information of the corrosion interface.
8. A scour corrosion monitoring apparatus for a pipeline, comprising:
the characteristic, concentration and distribution acquisition module is used for acquiring the flow characteristics and the particle concentration and distribution which correspond to each flow state pipe section of the target pipeline respectively; wherein each flow state pipe section comprises a bending pipe section, a horizontal pipe section and a jet flow pipe section;
the bent pipe section characteristic measuring module is used for measuring the erosion corrosion characteristics of the bent pipe section under the corresponding flow characteristics and the particle concentration and distribution state by using an array electrode method;
the horizontal pipe section characteristic measuring module is used for measuring the erosion corrosion characteristics of the horizontal pipe section under the corresponding flow characteristics and the particle concentration and distribution state by utilizing the erosion corrosion monitoring probe;
the jet flow pipe section characteristic measuring module is used for measuring the erosion corrosion characteristics of the jet flow pipe section under the corresponding flow characteristics and the particle concentration and distribution state by combining a polarization curve and an electrochemical noise method;
and the dynamic change information determination module is used for determining the dynamic change information of the corrosion interface of the target pipeline by combining the erosion corrosion characteristics corresponding to each flow state pipe section.
9. An erosion corrosion monitoring apparatus for a pipeline, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for erosion corrosion monitoring of a pipeline according to any one of claims 1 to 7.
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