CN118275525A - Device for monitoring scouring corrosion in pipeline and application thereof - Google Patents
Device for monitoring scouring corrosion in pipeline and application thereof Download PDFInfo
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Abstract
The invention discloses a device for monitoring the inner erosion and corrosion of a pipeline and application thereof, the scheme provides a device for monitoring the inner erosion and corrosion of the pipeline, a maintainer only needs to install the device on the pipeline through a flexible connecting belt, when a permanent magnet of the device is attached to the outer surface of the pipeline, the magnetic field range generated by the permanent magnet of the device covers the part to be monitored of the pipeline, the magnetic field strength can penetrate the pipe wall of the part to be monitored of the pipeline, and therefore, the magnetic field strength can be received and collected by a plurality of two-dimensional magnetic sensors, on the basis of the technology, the erosion and corrosion condition of the inner part of the pipeline can be deduced after the data collected by the two-dimensional magnetic sensors are denoised and analyzed, and the scheme also adopts a symmetrical deployment mode to enable the magnetic flux leakage data collected by the two-dimensional magnetic sensors with symmetrical relation to be used as a reference; the scheme is reliable in implementation and good in information feedback reference, and working interference cannot be caused to fluid transmission inside the pipeline in the monitoring process.
Description
Technical Field
The invention relates to the technical field of nondestructive testing technology and pipeline internal damage monitoring, in particular to a device for monitoring erosion corrosion in a pipeline and application thereof.
Background
The pipeline is used as an important device for conveying liquid and gas, and pipeline detection is a basic method for ensuring the safety of the pipeline in pipeline safety engineering. Among the various pipeline detection technologies, the magnetic flux leakage detection technology is the most widely applied and mature magnetic pipeline defect detection technology, and can acquire the magnetic flux density of defects, namely a magnetic flux leakage signal, and comprises a magnetic flux density radial component, a magnetic flux density axial component and a magnetic flux density circumferential component; the axial direction is the direction along the length of the pipeline, the radial direction is the direction vertical to the inner wall of the pipeline, and the circumferential direction is the circumferential direction of the pipeline.
In order to detect the damage condition in the pipeline, the traditional magnetic leakage detection technology is developed from the interior of the pipeline in the detection process, and the outline dimension and the position of the defect are obtained according to the magnetic leakage signal. The pipeline is required to be conveyed in a suspended manner, normal operation of the pipeline is disturbed to a certain extent, and along with continuous optimization of hardware equipment for detecting magnetic leakage, the current magnetic leakage detection equipment has great progress in cost and signal acquisition precision, so that on the premise of not disturbing normal operation of the pipeline, the magnetic field signal of a region to be monitored of the pipeline in a preset time length is acquired to analyze the internal abnormal condition of the region to be monitored, which is a relatively hot problem, the technical report about data acquisition from the outside of the pipeline and the evaluation of the internal corrosion and damage condition of the region to be monitored is disclosed in related literature, and therefore, the convenience of monitoring the internal corrosion of the pipeline is improved, the normal operation of the pipeline is not influenced, and the reliable abnormal feedback of the pipeline is provided for pipeline maintenance personnel.
Disclosure of Invention
In view of the above, the invention aims to provide a device for monitoring the erosion of the interior of a pipeline, which is reliable in implementation, flexible in application, free from interference to the pipeline operation and good in reference of the result, and an application thereof.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
an apparatus for monitoring erosion corrosion inside a pipe for monitoring erosion corrosion of a ferromagnetic pipe, the apparatus comprising:
The permanent magnet is attached to the outer surface of the pipeline so as to magnetize the pipeline, when the permanent magnet is attached to the outer surface of the pipeline, the generated magnetic field range covers the part to be monitored of the pipeline, and the magnetic field strength can penetrate through the pipe wall of the part to be monitored of the pipeline;
the shell is of a shell structure, two ends of the shell are provided with mutually independent accommodating cavities, the two accommodating cavities are of an open structure in the direction away from each other, and one accommodating cavity is adapted to the outline of the permanent magnet and accommodates the permanent magnet therein;
The flexible connecting belts are a pair and are arranged on two sides of the end part of the shell, which is provided with the permanent magnet, one end of each pair of flexible connecting belts is fixedly connected with the shell, and the other end of each pair of flexible connecting belts is used for encircling a part to be monitored of the pipeline, so that the shell and the permanent magnet are detachably fixed on the outer surface of the pipeline;
The two-dimensional magnetic sensors are arranged on the end surfaces of the pair of flexible connecting belts close to the pipeline and used for collecting magnetic flux leakage data of a part to be monitored of the pipeline;
The monitoring host is arranged in the other accommodating cavity of the shell and is connected with the two-dimensional magnetic sensors, so that the two-dimensional magnetic sensors are used for electric energy supply and magnetic flux leakage data acquisition.
As a possible implementation manner, the two-dimensional magnetic sensor is further used for collecting magnetic leakage data of parallel components and vertical components of a magnetic leakage field of a part to be monitored of the pipeline;
The sensitive axes of the two-dimensional magnetic sensors on the same flexible connecting belt are the same in direction;
The two-dimensional magnetic sensors on the pair of flexible connecting belts are symmetrically arranged, and the sensitive axes of the two-dimensional magnetic sensors are symmetrical.
As a possible implementation manner, in this embodiment, a pair of detachable mechanisms are provided on the ends of the flexible connection strips away from the housing, and the housing, together with the permanent magnet and the plurality of two-dimensional magnetic sensors, are detachably fixed to the outer surface of the pipeline through the detachable mechanisms.
Based on the above, the invention also provides a method for monitoring the erosion corrosion in the pipeline, which is applied with the device, and the device is arranged on the part to be monitored of the pipeline; the method comprises the following steps:
s01, collecting magnetic flux leakage data of a part to be detected of the pipeline through a two-dimensional magnetic sensor according to preset time frequency, and then collecting the magnetic flux leakage data with the two-dimensional magnetic sensor to generate a magnetic flux leakage data set after one-to-one correlation;
S02, performing independent detection and judgment on the magnetic flux leakage data in the magnetic flux leakage data set and/or performing combination judgment on the magnetic flux leakage data corresponding to the two-dimensional magnetic sensors with symmetrical positions according to a preset mode, and generating a judgment result for judging whether an abnormality exists in a part to be detected of the pointing pipeline;
s03, acquiring a judgment result, generating warning information when the pointing pipeline is abnormal, correlating the position information of the corresponding leakage magnetic sensor with the warning information, and outputting the position information.
As a preferred implementation choice, in the present solution S04, preferably, the plurality of two-dimensional magnetic sensors have unique ID numbers, and a symmetrical relation comparison table is formed between the plurality of two-dimensional magnetic sensors; the leakage data set is represented as follows:
Wherein, C t is the leakage flux data set collected at time point t, C nx is the leakage flux data collected by the two-dimensional magnetic sensor with the number n on the parallel component x, and C ny is the leakage flux data collected by the two-dimensional magnetic sensor with the number n on the perpendicular component y.
As a preferred implementation choice, in the present solution S02, the method for individually detecting and judging the magnetic flux leakage data in the magnetic flux leakage data set according to the preset manner preferably includes:
A01, constructing a magnetic field model, and supposing that the magnetic field distribution around the pipeline caused by the permanent magnet is as follows under the condition that the part to be monitored of the pipeline is not corroded or damaged:
Wherein B (r) is the magnetic flux density or magnetic field strength at a certain point r from the permanent magnet, μ 0 is the magnetic permeability of vacuum, which is a constant, the magnetic moment of the m permanent magnet, the position vector of r from the permanent magnet to the observation point, the cube of the r 3 position vector, which represents the influence of distance;
A02, constructing a leakage magnetic field model, and predicting the magnetic field distribution change caused by corrosion or damage in the pipeline based on the constructed magnetic field model, namely, the leakage magnetic field, wherein the mathematical model is simplified and expressed as follows:
Wherein, B leak (x, y, z) is the leakage magnetic field intensity at the position (x, y, z), and B 0 is the magnetic field base line intensity when the corrosion area is not affected; alpha is the attenuation coefficient, d is the corrosion depth, e is the base of the natural logarithm, e -αd is used to describe the exponential decay of the magnetic field strength following the corrosion depth d, To be used for representing the leakage magnetic field along with the observation angle theta andIs a variation of (2);
Assuming that the baseline of the magnetic field is not affected by corrosion, its distribution is known, which is denoted B baseline (x, y, z), where x, y, z are spatial coordinates;
When corrosion or damage is present, the actually measured magnetic field distribution B measured (x, y, z) will be different from the baseline, and the leakage magnetic field can be estimated by the difference between the measured value and the baseline value, as follows:
Bleak(x,y,z)＝Bmeasured(x,y,z)-Bbaseline(x，y，z)
for the case of measurement by adopting a two-dimensional magnetic sensor, the leakage magnetic field model can be decomposed into two parts in two directions, which are respectively:
parallel direction component (x direction):
Bleak,x(x,y)＝Bmeasured,x(x,y)-Bbaseline,x(x，y)
vertical direction component (y direction):
Bleak,y(x,y)＝Bmeasured,y(x,y)-Bbaseline,y(x，y)
Wherein B measured,x、Bmeasured,y is the actual measured magnetic field component in the x-direction, y-direction, respectively, and B baseline,x、Bbaseline,y is the baseline magnetic field component for the direction, respectively;
a03, preprocessing and extracting data acquired by the two-dimensional sensor, analyzing the extracted data according to a preset mode to identify the leakage magnetic field characteristics, and then obtaining a judging result of whether a region to be monitored of the pipeline has corrosion or damage.
As a preferred implementation choice, in the present embodiment a03, the preprocessing method for the data collected by the two-dimensional sensor includes denoising, and extracting the denoised data by using fourier transform, which includes:
The filter is used for denoising the data acquired by the two-dimensional sensor, and the formula is as follows:
y(t)＝x(t)×h(t)
wherein x (t) is an original signal, h (t) is an impulse response of the filter, and y (t) is an output signal;
the data after denoising is extracted by adopting Fourier transform, and the formula is as follows:
wherein, X (f) represents the Fourier transform of the signal X (t), when the original signal is denoised, the signal X (t) is the denoised output signal y (t), and after the Fourier transform, the signal X (t) provides the information of the frequency domain; j is an imaginary unit and f is a frequency.
As a preferred implementation choice, in the present embodiment a03, the extracted signal data is preferably determined by a statistical test or a machine learning model or a detection neural network, where the manner of determining by the statistical test or the machine learning model at least includes a threshold determination, and when the signal data is greater than a preset value, an anomaly is output as a determination result.
As a preferred implementation choice, preferably, in the present solution S02, the method for performing the combination judgment on the leakage magnetic data corresponding to the two-dimensional magnetic sensor with symmetrical positions according to the preset manner includes:
Extracting the magnetic flux leakage data correspondingly collected by the two-dimensional magnetic sensors with symmetrical positions from the magnetic flux leakage data set, respectively setting the magnetic flux leakage data as C j(Cjx,Cjy)、Ck(Ckx,Cky), and then substituting the magnetic flux leakage data into the following formula to calculate the difference measurement of the two magnetic flux leakage data:
Wherein D is Euclidean distance, C j(Cjx,Cjy) is magnetic leakage data of a parallel component x and a vertical component y acquired by a two-dimensional magnetic sensor at a symmetrical point at one side of a region to be monitored of a pipeline, and C k(Ckx,Cky) is magnetic leakage data of the parallel component x and the vertical component y acquired by the two-dimensional magnetic sensor at a symmetrical point at the other side of the region to be monitored of the pipeline;
comparing the calculated Euclidean distance D with a preset threshold K, and judging that the pipeline area where one of the symmetrical two-dimensional magnetic sensors is positioned is abnormal when the calculated Euclidean distance D exceeds the threshold K.
Based on the above, the invention also provides a method for monitoring the abnormality of the pipeline, which comprises the method for monitoring the erosion corrosion inside the pipeline; straight or curved pipes of said pipes.
By adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that: the technical scheme is characterized in that the device for monitoring the erosion corrosion in the pipeline is simple in structure, reliable in implementation and convenient to install, when a pipeline maintainer is applied, the device is detachably installed on a part to be detected of the pipeline only through a flexible connecting belt, a permanent magnet of the device is attached to a ferromagnetic pipeline, a plurality of two-dimensional magnetic sensors deployed on the flexible connecting belt are also contacted with the part to be detected of the pipeline, when the permanent magnet is attached to the outer surface of the pipeline, the generated magnetic field range of the permanent magnet covers the part to be monitored of the pipeline, the magnetic field strength can penetrate through the pipe wall of the part to be monitored of the pipeline, so that the data collected by the two-dimensional magnetic sensors are received and collected by the plurality of two-dimensional magnetic sensors, and after denoising and analysis are carried out on the data collected by the two-dimensional magnetic sensors, the erosion corrosion condition in the pipeline can be presumed, in addition, the scheme also enables the two-dimensional magnetic sensors with symmetrical relation to be used as references, and when the leakage magnetic data of the two-dimensional magnetic sensors deviate from a preset threshold value, the leakage magnetic data of the two-dimensional magnetic sensors can also indirectly reflect the condition of the corrosion in the pipeline, so that the pipeline corrosion information can be generated for the maintainer to carry out inspection and maintenance; the scheme is reliable in implementation and good in information feedback reference, and working interference cannot be caused to fluid transmission inside the pipeline in the monitoring process.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of one embodiment of the apparatus in three dimensions;
FIG. 2 is a schematic diagram of two three-dimensional views of one embodiment of the device;
FIG. 3 is a schematic deployment illustration of the present solution apparatus for monitoring in a 90 degree elbow conduit;
FIG. 4 is a schematic deployment illustration of the present solution apparatus for monitoring in straight pipe pipelines;
Fig. 5 is a schematic flow chart of a method according to the present embodiment.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is specifically noted that the following examples are only for illustrating the present invention, but do not limit the scope of the present invention. Likewise, the following examples are only some, but not all, of the examples of the present invention, and all other examples, which a person of ordinary skill in the art would obtain without making any inventive effort, are within the scope of the present invention.
As shown in one of fig. 1 to 2, the present embodiment is an apparatus 1 for monitoring erosion corrosion in a pipeline, for monitoring erosion corrosion in a ferromagnetic pipeline, the apparatus comprising:
The permanent magnet 2 is attached to the outer surface of the pipeline so as to magnetize the pipeline, when the permanent magnet 2 is attached to the outer surface of the pipeline, the generated magnetic field range covers the part to be monitored of the pipeline, and the magnetic field strength can penetrate the pipe wall of the part to be monitored of the pipeline;
The shell 3 is of a shell structure, two ends of the shell are provided with independent accommodating cavities, the two accommodating cavities are of an open structure in the direction away from each other, one accommodating cavity is matched with the outline of the permanent magnet 2, and the permanent magnet 2 is accommodated in the accommodating cavity;
The flexible connecting belts 4 are a pair and are arranged on two sides of the end part of the shell 3 containing the permanent magnet 2, one end of each pair of flexible connecting belts 4 is fixedly connected with the shell 3, and the other end of each pair of flexible connecting belts 4 is used for encircling a part to be monitored of a pipeline, so that the shell 3 and the permanent magnet 2 are detachably fixed on the outer surface of the pipeline;
The two-dimensional magnetic sensors 5 are arranged on the end surfaces of the pair of flexible connection 4 belts close to the pipeline, and the two-dimensional magnetic sensors 5 are used for collecting magnetic flux leakage data of a part to be monitored of the pipeline;
The monitoring host 6 is arranged in the other accommodating cavity of the shell 3 and is connected with a plurality of the two-dimensional magnetic sensors 5, so as to be used for supplying electric energy to the two-dimensional magnetic sensors 5 and collecting magnetic flux leakage data.
In this solution, as a possible implementation manner, further, the two-dimensional magnetic sensor 5 in this solution is configured to perform magnetic flux leakage data acquisition on a parallel component and a perpendicular component of a magnetic flux leakage field of a portion to be monitored of a pipeline;
wherein the sensitive axes of the two-dimensional magnetic sensors 5 positioned on the same flexible connecting belt 4 are the same in direction;
the two-dimensional magnetic sensors 5 on the pair of flexible connecting strips 4 are symmetrically arranged, and the sensitive axes of the two-dimensional magnetic sensors are symmetrical.
In addition, in this scheme, a pair of flexible coupling 4 takes is kept away from be equipped with the detachable mechanism of mutually supporting connection (for example, the detachable cooperation of hook face 8 and hook face 7 is pasted to the magic on the tip of shell), and make through detachable mechanism shell 3 together with permanent magnet 2, a plurality of two-dimensional magnetic sensor 5 are fixed in the pipeline surface by dismantling.
On the basis of fig. 1 and 2, a schematic deployment illustration of the device 1 for monitoring in a 90-degree elbow pipeline according to the embodiment of the present invention is shown in conjunction with fig. 3; the constructor only needs to detachably fix the shell 3 of the device 1, the permanent magnet 2 and the plurality of two-dimensional magnetic sensors 5 on the outer surface of the pipeline together through the flexible connecting belt 4 and the detachable mechanisms (7 and 8) at the tail end of the flexible connecting belt. Fig. 4 is a schematic deployment illustration of the device of the present solution for monitoring in a straight pipe.
Based on the above, the present embodiment also provides a method for monitoring the erosion corrosion inside a pipeline, which is applied with the device 1, wherein the device 1 is installed on a part to be monitored of the pipeline; as shown in connection with fig. 5, the method comprises:
s01, collecting magnetic flux leakage data of a part to be detected of the pipeline through a two-dimensional magnetic sensor according to preset time frequency, and then collecting the magnetic flux leakage data with the two-dimensional magnetic sensor to generate a magnetic flux leakage data set after one-to-one correlation;
S02, performing independent detection and judgment on the magnetic flux leakage data in the magnetic flux leakage data set and/or performing combination judgment on the magnetic flux leakage data corresponding to the two-dimensional magnetic sensors with symmetrical positions according to a preset mode, and generating a judgment result for judging whether an abnormality exists in a part to be detected of the pointing pipeline;
s03, acquiring a judgment result, generating warning information when the pointing pipeline is abnormal, correlating the position information of the corresponding leakage magnetic sensor with the warning information, and outputting the position information.
In order to facilitate data recording, gathering and calling, as a preferred implementation choice, preferably, in the scheme S04, the plurality of two-dimensional magnetic sensors all have unique ID numbers, and a symmetric relation comparison table is also formed between the plurality of two-dimensional magnetic sensors; the leakage data set is represented as follows:
Wherein, C t is the leakage flux data set collected at time point t, C nx is the leakage flux data collected by the two-dimensional magnetic sensor with the number n on the parallel component x, and C ny is the leakage flux data collected by the two-dimensional magnetic sensor with the number n on the perpendicular component y.
In terms of data determination, as a preferred implementation choice, preferably, in the present solution S02, the method for individually detecting and determining the magnetic flux leakage data in the magnetic flux leakage data set according to the preset manner includes:
A01, constructing a magnetic field model, and supposing that the magnetic field distribution around the pipeline caused by the permanent magnet is as follows under the condition that the part to be monitored of the pipeline is not corroded or damaged:
Wherein B (r) is the magnetic flux density or magnetic field strength at a certain point r from the permanent magnet, μ 0 is the magnetic permeability of vacuum, which is a constant, the magnetic moment of the m permanent magnet, the position vector of r from the permanent magnet to the observation point, the cube of the r 3 position vector, which represents the influence of distance;
A02, constructing a leakage magnetic field model, and predicting the magnetic field distribution change caused by corrosion or damage in the pipeline based on the constructed magnetic field model, namely, the leakage magnetic field, wherein the mathematical model is simplified and expressed as follows:
Wherein, B leak (x, y, z) is the leakage magnetic field intensity at the position (x, y, z), and B 0 is the magnetic field base line intensity when the corrosion area is not affected; alpha is the attenuation coefficient, d is the corrosion depth, e is the base of the natural logarithm, e -αd is used to describe the exponential decay of the magnetic field strength following the corrosion depth d, To be used for representing the leakage magnetic field along with the observation angle theta andIs a variation of (2);
Assuming that the baseline of the magnetic field is not affected by corrosion, its distribution is known, which is denoted B baseline (x, y, z), where x, y, z are spatial coordinates;
When corrosion or damage is present, the actually measured magnetic field distribution B measured (x, y, z) will be different from the baseline, and the leakage magnetic field can be estimated by the difference between the measured value and the baseline value, as follows:
Bleak(x,y,z)＝Bmeasured(x,y,z)-Bbaseline(x，y，z)
for the case of measurement by adopting a two-dimensional magnetic sensor, the leakage magnetic field model can be decomposed into two parts in two directions, which are respectively:
parallel direction component (x direction):
Bleak,x(x,y)＝Bmeasured,x(x,y)-Bbaseline,x(x，y)
vertical direction component (y direction):
Bleak,y(x,y)＝Bmeasured,y(x,y)-Bbaseline,y(x，y)
Wherein B measured,x、Bmeasured,y is the actual measured magnetic field component in the x-direction, y-direction, respectively, and B baseline,x、Bbaseline,y is the baseline magnetic field component for the direction, respectively;
a03, preprocessing and extracting data acquired by the two-dimensional sensor, analyzing the extracted data according to a preset mode to identify the leakage magnetic field characteristics, and then obtaining a judging result of whether a region to be monitored of the pipeline has corrosion or damage.
In order to improve the processing accuracy of data and avoid data interference and deviation caused by data noise, as a preferred implementation choice, preferably, in the scheme a03, a mode of preprocessing data collected by a two-dimensional sensor includes denoising, and extracting the denoised data by adopting fourier transform, which includes:
The filter is used for denoising the data acquired by the two-dimensional sensor, and the formula is as follows:
y(t)＝x(t)×h(t)
wherein x (t) is an original signal, h (t) is an impulse response of the filter, and y (t) is an output signal;
the data after denoising is extracted by adopting Fourier transform, and the formula is as follows:
wherein, X (f) represents the Fourier transform of the signal X (t), when the original signal is denoised, the signal X (t) is the denoised output signal y (t), and after the Fourier transform, the signal X (t) provides the information of the frequency domain; j is an imaginary unit and f is a frequency.
In the method a03, preferably, the extracted signal data is determined by a statistical test or a machine learning model or a detection neural network, where the statistical test or the machine learning model determining mode includes at least threshold determination, and when the signal data is greater than a preset value, an anomaly is output as a determination result.
In the scheme, when data analysis is performed by a signal processing technology, the data after Fourier transformation can be analyzed by Fourier transformation to identify abnormal signals in frequency, and then a judgment result is correspondingly generated. Besides, when the machine learning method is adopted to judge the data, abnormal data and normal data can be judged through machine learning models such as a Support Vector Machine (SVM) and a trained detection neural network, wherein the construction and training of the support vector machine and the detection neural network model are currently a well-known scheme, and the specific data analysis and judgment principle is not repeated here.
In addition, as a preferred implementation choice, in the present solution S02, preferably, the method for performing the combination judgment on the leakage magnetic data corresponding to the two-dimensional magnetic sensor with symmetrical positions according to the preset manner is as follows:
Extracting the magnetic flux leakage data correspondingly collected by the two-dimensional magnetic sensors with symmetrical positions from the magnetic flux leakage data set, respectively setting the magnetic flux leakage data as C j(Cjx,Cjy)、Ck(Ckx,Cky), and then substituting the magnetic flux leakage data into the following formula to calculate the difference measurement of the two magnetic flux leakage data:
Wherein D is Euclidean distance, C j(Cjx,Cjy) is magnetic leakage data of a parallel component x and a vertical component y acquired by a two-dimensional magnetic sensor at a symmetrical point at one side of a region to be monitored of a pipeline, and C k(Ckx,Cky) is magnetic leakage data of the parallel component x and the vertical component y acquired by the two-dimensional magnetic sensor at a symmetrical point at the other side of the region to be monitored of the pipeline;
comparing the calculated Euclidean distance D with a preset threshold K, and judging that the pipeline area where one of the symmetrical two-dimensional magnetic sensors is positioned is abnormal when the calculated Euclidean distance D exceeds the threshold K.
In the present solution S02, when two determination methods of performing separate detection determination on the magnetic flux leakage data in the magnetic flux leakage data set and performing combination determination on the magnetic flux leakage data corresponding to the two-dimensional magnetic sensor with symmetrical positions are adopted, two determination results for determining whether there is an abnormality in the portion to be detected of the pointing pipeline are generated correspondingly.
Correspondingly, in the scheme S03, when a judging result is obtained, if more than one item is judged to be abnormal, warning information is generated, and position information of a corresponding leakage magnetic sensor is associated with the warning information and then output together; and the overhauling personnel performs secondary rechecking so as to avoid the problems of omission and the like in pipeline monitoring.
Based on the above, the device and the method according to the embodiment of the present invention may also be applied to a method for monitoring abnormality of a pipeline; straight or curved pipes of said pipes.
In this scheme, the monitoring host can be used as a data acquisition terminal, which communicates with a remote server to realize remote monitoring, and in the remote server, a data processing unit and an information generating unit can be deployed to process and judge related data. For example: the data processing unit performs independent detection and judgment on the magnetic flux leakage data in the magnetic flux leakage data set and/or performs combination judgment on the magnetic flux leakage data corresponding to the two-dimensional magnetic sensors with symmetrical positions according to a preset mode, and generates a judgment result for judging whether an abnormality exists in a part to be detected of the pointing pipeline; the information generating unit is used for acquiring a judging result, generating warning information when the abnormal condition exists in the pointing pipeline, correlating the position information of the corresponding leakage magnetic sensor with the warning information, and then outputting the position information together.
In addition, each functional unit in each embodiment of the present invention may be integrated in one processing unit, each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods of the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing description is only a partial embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent devices or equivalent processes using the descriptions and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (10)
1. A device for monitoring erosion corrosion in a pipe, for monitoring erosion corrosion in a ferromagnetic pipe, the device comprising:
The permanent magnet is attached to the outer surface of the pipeline so as to magnetize the pipeline, when the permanent magnet is attached to the outer surface of the pipeline, the generated magnetic field range covers the part to be monitored of the pipeline, and the magnetic field strength can penetrate through the pipe wall of the part to be monitored of the pipeline;
the shell is of a shell structure, two ends of the shell are provided with mutually independent accommodating cavities, the two accommodating cavities are of an open structure in the direction away from each other, and one accommodating cavity is adapted to the outline of the permanent magnet and accommodates the permanent magnet therein;
The flexible connecting belts are a pair and are arranged on two sides of the end part of the shell, which is provided with the permanent magnet, one end of each pair of flexible connecting belts is fixedly connected with the shell, and the other end of each pair of flexible connecting belts is used for encircling a part to be monitored of the pipeline, so that the shell and the permanent magnet are detachably fixed on the outer surface of the pipeline;
The two-dimensional magnetic sensors are arranged on the end surfaces of the pair of flexible connecting belts close to the pipeline and used for collecting magnetic flux leakage data of a part to be monitored of the pipeline;
The monitoring host is arranged in the other accommodating cavity of the shell and is connected with the two-dimensional magnetic sensors, so that the two-dimensional magnetic sensors are used for electric energy supply and magnetic flux leakage data acquisition.
2. The device for monitoring the erosion corrosion inside a pipeline according to claim 1, wherein the two-dimensional magnetic sensor is used for collecting magnetic leakage data of parallel components and vertical components of a magnetic leakage field of a part to be monitored of the pipeline;
The sensitive axes of the two-dimensional magnetic sensors on the same flexible connecting belt are the same in direction;
The two-dimensional magnetic sensors on the pair of flexible connecting belts are symmetrically arranged, and the sensitive axes of the two-dimensional magnetic sensors are symmetrical.
3. A device for monitoring the erosion corrosion of the interior of a pipeline according to claim 1 or 2, wherein the end portions of the pair of flexible connecting strips, which are far from the shell, are provided with mutually matched and connected detachable mechanisms, and the shell together with the permanent magnet and the plurality of two-dimensional magnetic sensors are detachably fixed on the outer surface of the pipeline through the detachable mechanisms.
4. A method for monitoring the erosion corrosion of a pipe, characterized in that it employs a device according to one of claims 1 to 3, which is mounted to the portion of the pipe to be monitored; the method comprises the following steps:
s01, collecting magnetic flux leakage data of a part to be detected of the pipeline through a two-dimensional magnetic sensor according to preset time frequency, and then collecting the magnetic flux leakage data with the two-dimensional magnetic sensor to generate a magnetic flux leakage data set after one-to-one correlation;
S02, performing independent detection and judgment on the magnetic flux leakage data in the magnetic flux leakage data set and/or performing combination judgment on the magnetic flux leakage data corresponding to the two-dimensional magnetic sensors with symmetrical positions according to a preset mode, and generating a judgment result for judging whether an abnormality exists in a part to be detected of the pointing pipeline;
s03, acquiring a judgment result, generating warning information when the pointing pipeline is abnormal, correlating the position information of the corresponding leakage magnetic sensor with the warning information, and outputting the position information.
5. The method for monitoring the erosion of the interior of a pipeline according to claim 4, wherein in S04, the plurality of two-dimensional magnetic sensors each have a unique ID number, and a symmetrical relation comparison table is formed between the plurality of two-dimensional magnetic sensors; the leakage data set is represented as follows:
Wherein, C t is the leakage flux data set collected at time point t, C nx is the leakage flux data collected by the two-dimensional magnetic sensor with the number n on the parallel component x, and C ny is the leakage flux data collected by the two-dimensional magnetic sensor with the number n on the perpendicular component y.
6. The method for monitoring the erosion corrosion in the pipeline according to claim 5, wherein in S02, the method for individually detecting and judging the magnetic flux leakage data in the magnetic flux leakage data set according to a preset manner is as follows:
A01, constructing a magnetic field model, and supposing that the magnetic field distribution around the pipeline caused by the permanent magnet is as follows under the condition that the part to be monitored of the pipeline is not corroded or damaged:
Wherein B (r) is the magnetic flux density or magnetic field strength at a certain point r from the permanent magnet, μ 0 is the magnetic permeability of vacuum, which is a constant, the magnetic moment of the m permanent magnet, the position vector of r from the permanent magnet to the observation point, the cube of the r 3 position vector, which represents the influence of distance;
A02, constructing a leakage magnetic field model, and predicting the magnetic field distribution change caused by corrosion or damage in the pipeline based on the constructed magnetic field model, namely, the leakage magnetic field, wherein the mathematical model is simplified and expressed as follows:
Wherein, B leak (x, y, z) is the leakage magnetic field intensity at the position (x, y, z), and B 0 is the magnetic field base line intensity when the corrosion area is not affected; alpha is the attenuation coefficient, d is the corrosion depth, e is the base of the natural logarithm, e -αd is used to describe the exponential decay of the magnetic field strength following the corrosion depth d, To be used for representing the leakage magnetic field along with the observation angle theta andIs a variation of (2);
Assuming that the baseline of the magnetic field is not affected by corrosion, its distribution is known, which is denoted B baseline (x, y, z), where x, y, z are spatial coordinates;
When corrosion or damage is present, the actually measured magnetic field distribution B measured (x, y, z) will be different from the baseline, and the leakage magnetic field can be estimated by the difference between the measured value and the baseline value, as follows:
Bleak(x,y,z)＝Bmeasured(x,y,z)-Bbaseline(x,y,z)
for the case of measurement by adopting a two-dimensional magnetic sensor, the leakage magnetic field model can be decomposed into two parts in two directions, which are respectively:
parallel direction component (x direction):
Bleak,x(x,y)＝Bmeasured,x(x,y)-Bbaseline,x(x,y)
vertical direction component (y direction):
Bleak,y(x,y)＝Bmeasured,y(x,y)-Bbaseline,y(x,y)
wherein B measured,x、Bmeasured,y is the actual measured magnetic field component in the x-direction, y-direction, respectively, and B baseline,x、Bbaseline,y is the baseline magnetic field component for the direction, respectively;
a03, preprocessing and extracting data acquired by the two-dimensional sensor, analyzing the extracted data according to a preset mode to identify the leakage magnetic field characteristics, and then obtaining a judging result of whether a region to be monitored of the pipeline has corrosion or damage.
7. The method for monitoring the erosion of the interior of a pipeline according to claim 6, wherein the preprocessing of the data collected by the two-dimensional sensor in a03 includes denoising, and extracting the denoised data by fourier transform, which includes:
The filter is used for denoising the data acquired by the two-dimensional sensor, and the formula is as follows:
y(t)＝x(t)×h(t)
wherein x (t) is an original signal, h (t) is an impulse response of the filter, and y (t) is an output signal;
the data after denoising is extracted by adopting Fourier transform, and the formula is as follows:
wherein, X (f) represents the Fourier transform of the signal X (t), when the original signal is denoised, the signal X (t) is the denoised output signal y (t), and after the Fourier transform, the signal X (t) provides the information of the frequency domain; j is an imaginary unit and f is a frequency.
8. A method for monitoring erosion of a pipeline interior as defined in claim 7 wherein,
In a03, the extracted signal data is judged through a statistical test or a machine learning model or a detection neural network, wherein the statistical test or the machine learning model judging mode at least comprises threshold judgment, and when the signal data is larger than a preset value, an abnormality is output as a judging result.
9. The method for monitoring the erosion corrosion in the pipeline according to claim 6, wherein in S02, the method for performing the combination judgment on the leakage magnetic data corresponding to the two-dimensional magnetic sensor with symmetrical positions according to the preset mode is as follows:
Extracting the magnetic flux leakage data correspondingly collected by the two-dimensional magnetic sensors with symmetrical positions from the magnetic flux leakage data set, respectively setting the magnetic flux leakage data as C j(Cjx,Cjy)、Ck(Ckx,Cky), and then substituting the magnetic flux leakage data into the following formula to calculate the difference measurement of the two magnetic flux leakage data:
Wherein D is Euclidean distance, C j(Cjx,Cjy) is magnetic leakage data of a parallel component x and a vertical component y acquired by a two-dimensional magnetic sensor at a symmetrical point at one side of a region to be monitored of a pipeline, and C k(Ckx,Cky) is magnetic leakage data of the parallel component x and the vertical component y acquired by the two-dimensional magnetic sensor at a symmetrical point at the other side of the region to be monitored of the pipeline;
comparing the calculated Euclidean distance D with a preset threshold K, and judging that the pipeline area where one of the symmetrical two-dimensional magnetic sensors is positioned is abnormal when the calculated Euclidean distance D exceeds the threshold K.
10. A method for monitoring anomalies in pipes, characterized in that it comprises a method for monitoring the erosion inside pipes according to one of claims 4 to 9; straight or curved pipes of said pipes.
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