Ship pipeline leakage assessment method based on digital twinning

Abstract

The invention relates to a ship pipeline leakage assessment method based on digital twinning. By performing three-dimensional simulation on the ship seawater pipeline in advance, predicting the wall thickness of the pipeline in real time and judging the service life of the pipeline, the pipeline which possibly leaks can be determined, and early warning and timely replacement can be performed on the pipeline, so that the pipeline leakage of the ship in the sailing process can be avoided, and the service life of the ship can be prolonged. Economic losses caused by ship seawater pipeline leakage are reduced, and the reliability of ship operation is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship pipeline, in particular to a ship pipeline leakage evaluation method based on digital twinning. BACKGROUND

[0002] Seawater corrosion exists in the ship seawater pipeline system at all times, and as the ship operation time elapses, the seawater pipe wall gradually thins out until the last breakage occurs. When the pipeline corrosion occurs during the ship's sailing task, the leakage of seawater into the ship and the paralysis of the seawater system will seriously affect the normal and safe operation of the ship.

[0003] In view of the randomness of seawater corrosion, the prior art cannot determine the position of seawater leakage before the seawater pipeline leaks, and cannot make an early prediction of the corrosion problem of the seawater system pipeline before the trial. Therefore, the current protection of ship seawater pipeline leakage is mostly post-maintenance, that is, corresponding maintenance and pipeline replacement operations are carried out after the pipeline leaks, thereby affecting the safe operation of the ship during the trial and causing huge losses. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a ship pipeline leakage evaluation method based on digital twinning, which solves the problem that the protection of ship seawater pipeline leakage in the prior art is post-maintenance, thereby affecting the safe operation of the ship during the trial and causing huge losses.

[0005] To achieve the above-mentioned purpose and other related purposes, the present application provides a ship pipeline leakage evaluation method based on digital twinning, which comprises:

[0006] Obtaining parameters, the parameters including a real ship seawater pipeline geometric model, equipment parameters in a file library, and inlet and outlet boundary conditions of the seawater pipeline system;

[0007] According to the obtained parameters, a one-dimensional simulation model of the ship seawater pipeline is constructed to obtain the flow rate of each pipeline of the ship;

[0008] According to the obtained flow rate of each pipeline of the ship, the corrosion-prone pipeline is determined;

[0009] According to the obtained parameters and the determined corrosion-prone pipeline, a three-dimensional simulation model of each corrosion-prone pipeline is constructed to obtain the flow rate, shear force or corrosion rate inside each corrosion-prone pipeline;

[0010] According to the obtained flow rate, shear force or corrosion rate of each corrosion-prone pipeline, the corrosion-prone position in each corrosion-prone pipeline is determined;

[0011] The real-time wall thickness of the corrosion-prone position is predicted, and the pipeline life is evaluated.

[0012] According to the pipeline life, the pipeline that may leak is warned and treated so that the pipeline can support the entire navigation task.

[0013] Optionally, the determination of the corrosion-prone pipeline according to the obtained flow rate of each pipeline of the ship is made according to the principle that the higher the flow rate, the faster the corrosion rate.

[0014] The determination of the corrosion-prone position in each corrosion-prone pipeline according to the obtained flow rate, shear force or corrosion rate of each corrosion-prone pipeline is to determine the position with higher flow rate, greater shear force or faster corrosion rate in the corrosion-prone pipeline as the corrosion-prone position.

[0015] Optionally, the obtaining of the flow rate, shear force or corrosion rate inside each corrosion-prone pipeline can directly call a three-dimensional simulation software to perform the entire ship seawater pipeline system simulation when the computing resources are sufficient.

[0016] Optionally, the construction of the one-dimensional simulation model of the ship seawater pipeline can be performed by using a one-dimensional pipeline network simulation software, and the simulation software includes Applied Flow Technology and Flomaster.

[0017] The construction of the three-dimensional simulation model of each corrosion-prone pipeline can be performed by using a three-dimensional simulation software, and the simulation software includes STAR-CCM and ANSYS.

[0018] Optionally, the evaluation method further includes arranging an online corrosion measurement device based on ultrasonic technology at the corrosion-prone position, and feeding the measured wall thickness data to the three-dimensional simulation model of the ship seawater pipeline.

[0019] Optionally, the evaluation method further includes arranging an online flow measurement device based on ultrasonic technology on each main pipeline, and feeding the flow rate measured by the online flow measurement device to the one-dimensional simulation model of the ship seawater pipeline.

[0020] Optionally, the flow rate measured by the online flow measurement device and the wall thickness data of the corrosion-prone position measured by the online corrosion measurement device can be displayed in real time at the seawater system pipeline state control center.

[0021] Optionally, after the three-dimensional simulation model of each corrosion-prone pipeline is constructed, the evaluation method further includes:

[0022] According to the three-dimensional simulation pipeline corrosion state result, the rationality of the pipeline arrangement is judged.

[0023] If the pipeline arrangement is not reasonable, the seawater pipeline geometric model is optimized.

[0024] In a ship pipeline leakage evaluation method based on digital twinning provided by the present application, the three-dimensional simulation of the ship seawater pipeline is performed in advance, the pipeline wall thickness is predicted in real time, and the pipeline life is judged, so that the pipeline that may leak can be determined, and early warning and timely replacement can be performed, so that the pipeline leakage of the ship during navigation can be avoided, and the economic loss caused by the seawater pipeline leakage of the ship can be reduced, and the reliability of the ship operation can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a ship pipeline leakage evaluation method flowchart based on digital twinning of an embodiment of the present application;

[0026] Figure 2 is a ship pipeline system schematic diagram based on digital twinning of an embodiment of the present application.

[0027] Among them: 1, seawater system inlet and outlet; 2, filter and other seawater filtering devices; 3, pump set and other power units; 4, electric regulating valve; 5, flow online measurement device; 6, corrosion online measurement device. DETAILED DESCRIPTION

[0028] A ship pipeline leakage evaluation method based on digital twinning of the present application will be described below with reference to Figure 1 and Figure 2 .

[0029] As shown in Figure 1 , the present application provides a ship pipeline leakage evaluation method based on digital twinning, and the evaluation method comprises:

[0030] Step S1, obtaining parameters, including the real ship seawater pipeline geometric model, the equipment parameters in the file library, and the inlet and outlet boundary conditions of the seawater pipeline system.

[0031] Step S2, constructing a one-dimensional simulation model of the ship seawater pipeline according to the obtained parameters, to obtain the flow rate of each pipeline of the ship.

[0032] Further, referring to Figure 2 , one-dimensional pipeline network simulation software can be used for one-dimensional simulation of the ship seawater pipeline, and the simulation software includes Applied Flow Technology and Flomaster. Of course, the pipeline network software can also be independently programmed.

[0033] Step S3, according to the obtained flow rate of each pipeline of the ship, determine the corrosion-prone pipeline. Since there is no quantitative function expression for the corrosion rate at present, the corrosion-prone pipeline can be determined by qualitative analysis according to the correlation principle that the higher the flow rate, the faster the corrosion rate. According to the analysis of the corrosion-prone pipeline for many times, a preset flow rate value can be set according to the experience of the flow rate corresponding to the corrosion rate. When the pipeline flow rate is higher than the preset flow rate value, it means that the pipeline flow rate is high, the corrosion rate is fast, and it may cause pipeline leakage during the ship navigation. Therefore, the pipeline is determined as the corrosion-prone pipeline. The setting of the preset flow rate is also related to the length of the single navigation time of the ship. The shorter the navigation time of the ship, the higher the selected preset flow rate value, as long as it can ensure that there is no pipeline leakage during the navigation.

[0034] Further, with reference to Figure 2 , the evaluation method further comprises arranging a non-destructive flow online measurement device based on ultrasonic technology on each main pipeline, and feeding back the flow rate measured by the flow online measurement device to the one-dimensional simulation model of the ship seawater pipeline, so as to further improve the accuracy of the simulation results of the one-dimensional simulation model.

[0035] Step S4, according to the parameters obtained in step S1 and the determined corrosion-prone pipeline, construct a three-dimensional simulation model of each corrosion-prone pipeline to obtain the flow rate, shear force or corrosion rate inside each corrosion-prone pipeline. Since the calculation resources required for constructing the three-dimensional simulation model are relatively large compared with the one-dimensional simulation model, if the three-dimensional simulation model of the entire ship seawater pipeline is directly constructed, it may lead to inaccurate simulation results. Therefore, the corrosion-prone pipeline is first determined by the one-dimensional simulation model, and then the three-dimensional simulation model of each corrosion-prone pipeline is constructed, which can improve the accuracy of the subsequent three-dimensional simulation results, that is, the obtained flow rate, shear force or corrosion rate inside each corrosion-prone pipeline is more accurate and convenient for subsequent analysis.

[0036] Further, with reference to Figure 2 , three-dimensional simulation software can be used for three-dimensional simulation of ship pipelines. The simulation software includes STAR-CCM, ANSYS. Of course, the flow field simulation software can also be independently programmed.

[0037] Further, when the calculation resources are sufficient, the three-dimensional simulation software can be directly called to simulate the entire ship seawater pipeline system, and then the flow rate, shear force or corrosion rate inside each corrosion-prone pipeline is comprehensively determined.

[0038] Step S5: Based on the obtained flow velocity, shear force, or corrosion rate of each severely corrosive pipeline, determine the location of severe corrosion within each pipeline. That is, identify locations within the severely corrosive pipeline where the flow velocity is high, the shear force is high, or the corrosion rate is fast. Analogous to the relationship between severely corrosive pipelines and pipeline flow velocity, similarly, preset flow velocity values, preset shear force values, and preset corrosion rate values ​​can be set based on experience. Locations within the pipeline that exceed these preset flow velocity, shear force, or corrosion rate values ​​are then identified as the most severely corrosive locations within each pipeline.

[0039] Alternatively, taking a reducing pipeline as an example, the flow velocity varies significantly at different locations within the reducing pipeline, with the velocity decreasing relatively closer to the pipeline outlet. Locations with locally higher flow velocities within the reducing pipeline are identified as areas with severe corrosion.

[0040] Step S6 involves predicting the real-time wall thickness at severely corroded locations and assessing the pipeline's lifespan. Specifically, taking the corrosion rate obtained from a 3D simulation model as an example, the corrosion thickness of the pipeline can be determined using the corrosion rate and time. Then, the original pipeline thickness can be determined based on the equipment parameters from step S1. By calculating the difference between the two, the real-time wall thickness of the pipeline at severely corroded locations can be determined. Simultaneously, based on the real-time wall thickness and corrosion rate, the time required for the pipeline to corrode and leak, i.e., the pipeline's lifespan, can be determined.

[0041] Further, refer to Figure 2 The evaluation method also includes deploying online corrosion measurement devices based on ultrasonic technology in severely corrosive locations. Corrosion measurement data, such as wall thickness, is then fed back to the 3D simulation model of the ship's seawater pipeline to continuously improve the accuracy of the simulation results. Furthermore, identifying severely corrosive locations before deploying the online corrosion measurement devices avoids blindly placing them on the pipeline, thereby reducing the number of devices needed and lowering costs.

[0042] Step S7: Based on the pipeline's lifespan, issue warnings and take measures to address pipelines that may leak, ensuring the pipelines can support the entire voyage. In other words, issue warnings and take measures for pipelines whose lifespan is less than the voyage cycle. Corresponding pipelines can be marked as warnings and replaced before departure to avoid pipeline leaks during navigation. Alternatively, during navigation, the electrically controlled valves on the marked pipelines can be adjusted to control the flow rate, thereby slowing down the corrosion rate and maximizing the completion of the voyage.

[0043] In summary, by conducting 3D simulation of the ship's seawater pipelines in advance, predicting the pipeline wall thickness in real time, and assessing the pipeline lifespan, it is possible to identify pipelines that may leak, provide early warnings, and replace them in a timely manner. This can prevent pipeline leaks during ship navigation, thereby reducing economic losses caused by seawater pipeline leaks and improving the reliability of ship operation.

[0044] Furthermore, after constructing three-dimensional simulation models of various severely corrosive pipelines, the evaluation methods also include:

[0045] The rationality of the pipeline layout is evaluated based on the results of the 3D simulation of pipeline corrosion status.

[0046] If the pipeline layout is unreasonable, the geometric model of the seawater pipeline will be optimized, which means optimizing the three-dimensional simulation model.

[0047] In other words, after identifying the locations of severe pipeline corrosion, preliminary pipeline adjustments are made to these areas, including changes to the pipeline layout and diameter. For example, the pipe bend angle is reduced and the pipe diameter is increased to lower the flow velocity. Following pipeline optimization, a new 3D simulation model is constructed, and simulation results are predicted.

[0048] In addition, the flow velocity results of each pipeline measured by the online flow measurement device and the wall thickness of severely corroded locations measured by the online corrosion measurement device can be displayed in real time at the seawater system pipeline status control center, which is convenient for staff to observe and adjust.

[0049] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for assessing ship pipeline leakage based on digital twins, characterized in that, The evaluation method includes: Acquire parameters, including the geometric model of the actual ship's seawater pipeline, equipment parameters in the file library, and inlet and outlet boundary conditions of the seawater pipeline system; Based on the obtained parameters, a one-dimensional simulation model of the ship's seawater pipeline is constructed to obtain the flow velocity of each pipeline on the ship. Based on the obtained flow velocities of each pipeline on the ship, the pipelines with the worst corrosion were identified; Based on the obtained parameters and the determined corrosive pipelines, a three-dimensional simulation model of each corrosive pipeline is constructed to obtain the flow velocity, shear force or corrosion rate inside each corrosive pipeline. Based on the obtained flow velocity, shear force, or corrosion rate of each of the aforementioned severely corrosive pipelines, determine the location of severe corrosion in each of the severely corrosive pipelines; The real-time wall thickness at the severely corroded locations is predicted, and the pipeline life is assessed. Based on the pipeline's lifespan, early warning and handling measures are implemented for pipelines that may leak, ensuring that the pipeline can support the entire navigation mission.

2. The method for assessing ship pipeline leakage based on digital twins according to claim 1, characterized in that, The determination of the most corrosive pipelines based on the obtained flow velocity of each pipeline on the ship is based on the principle that the higher the flow velocity, the faster the corrosion rate. The method of determining the location of severe corrosion in each severely corrosive pipeline based on the obtained flow velocity, shear force, or corrosion rate is to identify the location with higher flow velocity, higher shear force, or faster corrosion rate within the severely corrosive pipeline as the location of severe corrosion.

3. The method for assessing ship pipeline leakage based on digital twins according to claim 1, characterized in that, The flow velocity, shear force, or corrosion rate inside each of the aforementioned severely corrosive pipelines can be obtained by directly calling three-dimensional simulation software to simulate the entire ship's seawater pipeline system when sufficient computing resources are available.

4. The method for assessing ship pipeline leakage based on digital twins according to claim 1, characterized in that, The construction of a one-dimensional simulation model of a ship's seawater pipeline can be carried out using one-dimensional pipeline simulation software, including AppliedFlow Technology and Flomaster. The construction of the three-dimensional simulation model of each of the aforementioned corrosive pipelines can be carried out using three-dimensional simulation software, including STAR-CCM and ANSYS.

5. The method for assessing ship pipeline leakage based on digital twins according to claim 1, characterized in that, The assessment method also includes deploying an online corrosion measurement device based on ultrasonic technology in severely corrosive locations and feeding back the measured wall thickness data to the three-dimensional simulation model of the ship's seawater pipeline.

6. The method for assessing ship pipeline leakage based on digital twins according to claim 5, characterized in that, The evaluation method also includes arranging non-destructive online flow measurement devices based on ultrasonic technology on each main pipeline, and feeding back the flow velocity measured by the online flow measurement devices to the one-dimensional simulation model of the ship's seawater pipeline.

7. The method for assessing ship pipeline leakage based on digital twins according to claim 6, characterized in that, The flow velocity measured by the online flow measurement device and the wall thickness data of the severely corroded locations measured by the online corrosion measurement device can both be displayed in real time at the seawater system pipeline status control center.

8. The method for assessing ship pipeline leakage based on digital twins according to claim 1, characterized in that, After constructing three-dimensional simulation models of various severely corrosive pipelines, the evaluation method further includes: The rationality of the pipeline layout is evaluated based on the results of the 3D simulation of pipeline corrosion status. If the pipeline layout is unreasonable, the geometric model of the seawater pipeline will be optimized.

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