CN107657072A - Computational methods and device of the buried metal pipeline by DC influence - Google Patents
Computational methods and device of the buried metal pipeline by DC influence Download PDFInfo
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- 238000004210 cathodic protection Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
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Abstract
Computational methods and device the invention provides a kind of buried metal pipeline by DC influence.This method comprises the following steps：Obtaining has the first polarization curve of coated pipeline；By the first polarization curve sectional linear fitting, the coating surface resistivity and working metal current potential of each section of fitting a straight line of acquisition and its fitting polarization potential section；There is the polarization potential of coated pipeline everywhere to thering is coated pipeline to be segmented and carrying out assignment to each pipeline section respectively to calculate；It is located at when calculating the polarization potential at least one outside fitting polarization potential section, the polarization potential for having coated pipeline is iterated and calculated until having the difference of the twice adjacent calculation of the polarization potential of coated pipeline everywhere in threshold value, it is determined that there is the polarization potential on coated pipeline everywhere.Computational methods provided by the invention are by considering the calculating of polarity effect so that result of calculation more closing to reality situation, the precision of result of calculation are further increased, so as to assess the possibility occurrence of galvano-cautery exactly.
Description
Technical field
The present invention relates to technical field of electric power, is calculated in particular to a kind of buried metal pipeline by DC influence
Method and device.
Background technology
When there is direct current to flow into ground on DC transmission system earthing pole, one can be formed in the soil near the location of pole directly
Current field is flowed, and along with there is ground potential rise.DC stray current can circulate on the pipeline near earthing pole, and
Galvano-cautery occurs for the region for flowing out pipeline.
In conventional direct current grounding pole earth current is calculated the corrosion impact of neighbouring buried oil-gas pipeline, more goes back
It is to use to influence identical computational methods to buried oil-gas pipeline with exchanging earth current, pipeline anticorrosion coating is seldom considered in calculating
Metal and the direct current " polarity effect " on soil interface at breaking point.On cathodic protection is not carried out in GB50991-2014
Pipeline, its corrosion control index is polarization potential skew 100mV, and direct current grounding pole earth current is broken in pipeline in some cases
Polarization potential difference is likely to be breached 70~80mV caused by damage, does not consider that direct current polarization effect can make it that error calculated is inclined
Greatly.
China Patent Publication No.：The A of CN 106021866, a kind of direct current grounding pole is disclosed to AC network and Oil/Gas Pipe
The unified calculation method that road influences.The unified calculation method disclosed by the invention, by creating in transmission line of electricity, AC network
The substation network model and pipeline that the resistance of each substation transformer and the resistance of DC converter station converter power transformer are formed
Model, in the ground potential of each transformer station in calculating AC network, it is contemplated that metal buried pipeline leakage current is in transformer station
The influence of first additional current potential caused by network model；Meanwhile when calculating the ground potential of pipeline, it is also considered that to AC network
The influence of earth current second additional current potential caused by metal buried pipeline model at neutral ground.
Computational methods in above-mentioned technical proposal have ignored at pipeline anticorrosion coating breaking point on metal and soil interface
Direct current " polarity effect ", therefore this method result of calculation differs larger with actual, causes the galvano-cautery in Near Pipelines region to assess
As a result it is inaccurate, it have impact on the safe operation of pipeline.
The content of the invention
In consideration of it, the present invention proposes computational methods and device of a kind of buried metal pipeline by DC influence, it is intended to solves
Certainly existing pipeline the problem of calculation error is larger in by the method for the calculating of DC influence.
On one side, the present invention proposes a kind of computational methods of buried metal pipeline by DC influence, and this method includes
Following steps：Damaged acquisition according to there is coated pipeline has the first polarization curve of coated pipeline；By above-mentioned first polarization curve
First polarization curve segmentation obtained in acquisition process carries out linear fit, obtains coat side corresponding to each section of fitting a straight line
Resistivity and working metal current potential and its fitting polarization potential section；There is coated pipeline to be segmented to described, according to above-mentioned
The corresponding coating surface resistivity obtained during one parameter fitting and the working metal current potential are respectively to each
Pipeline section carries out assignment described has the polarization potential of coated pipeline everywhere to calculate；When having described in calculating at least one on coated pipeline
The polarization potential at place has coated pipeline positioned at being carried out to it after assignment outside the corresponding fitting polarization potential section, to described
Polarization potential is iterated the difference for calculating the twice adjacent calculation for having the polarization potential of coated pipeline everywhere described in
In threshold value, it is determined that the polarization potential having on coated pipeline everywhere.
Further, above-mentioned buried metal pipeline is by the computational methods of DC influence, the fitting of first polarization curve
During, the calculation formula that first polarization curve carries out linear fit is：Y=a+bx；Wherein, a has coated pipe to be described
The working metal current potential in road；B absolute value | b | for the coating surface resistivity for having coated pipeline；X has coated pipeline to be described
Current density；Y is the polarization potential for having coated pipeline.
Further, above-mentioned buried metal pipeline by DC influence computational methods, in the determination of the polarization potential,
It is described to have in coated pipeline by the big pipeline section institute assignment of DC influence in the initial assignment calculating process of the polarization potential
The coating surface resistivity is less than the coating surface resistivity by the small pipeline section institute assignment of DC influence.
Further, above-mentioned buried metal pipeline by DC influence computational methods, in the iteration meter of the polarization potential
During calculation, during to the first time assignment for thering is coated pipeline to carry out, in the assignment calculating process for judging the polarization potential
Fitting polarization potential section belonging to the polarization potential of calculating, and determine therefrom that its corresponding coating surface resistivity and institute
Working metal current potential is stated to have coated pipeline to carry out assignment to described；
To it is described there is the coated pipeline to carry out follow-up assignment when, the fitting before judging belonging to the polarization potential that once calculates polarizes
Potential region, and its corresponding coating surface resistivity and the working metal current potential are determined therefrom that to have coating to described
Pipeline carries out assignment.
Further, above-mentioned buried metal pipeline by DC influence computational methods, in the iteration meter of the polarization potential
During calculation, the threshold value is 1%.
Further, above-mentioned buried metal pipeline by DC influence computational methods, in obtaining for first polarization curve
During taking, first polarization curve is obtained by coating damage rate and the product of the second polarization curve of metallic conduit.
Computational methods provided by the invention are by there is coated pipeline to obtain the first polarization curve after considering polarity effect, leading to
Cross and linear fit is carried out to the first polarization curve, by having the multiple calculating of coated pipeline until the polarization potential calculated meets
It is required that final determine there is the polarization potential of coated pipeline everywhere.
Further, the present invention considers at pipeline anticorrosion coating breaking point metal with the direct current on soil interface to buried
The influence of metallic conduit, realize the calculating of buried metal pipeline polarization potential everywhere.
Especially, computational methods provided by the invention are by considering the calculating of polarity effect so that result of calculation is more sticked on
Nearly actual conditions, further increase the precision of result of calculation, and then reduce the possibility occurrence of galvano-cautery, so as to exactly
Assess the possibility occurrence of galvano-cautery.In addition, this method can accurately and effectively calculate buried metal pipeline by DC influence
Influence, there is stronger operability in engineering, be easy to implement.
On the other hand, the present invention proposes a kind of computing device of buried metal pipeline by DC influence, and the device includes：
Acquisition module, for there is the first polarization curve of coated pipeline according to the damaged acquisition for having coated pipeline；Fitting module, for inciting somebody to action
The first polarization curve segmentation carries out linear fit, obtains coating surface resistivity and working metal corresponding to each section of fitting a straight line
Current potential and its fitting polarization potential section；Initial assignment computing module, for there is coated pipeline to be segmented, according to acquisition
The corresponding coating surface resistivity and the working metal current potential carry out assignment to each pipeline section respectively described has painting to calculate
The polarization potential of layer pipeline everywhere；Module is iterated to calculate, for when the polarization potential position having at least one on coated pipeline
After assignment is carried out to it outside corresponding fitting polarization potential section, the polarization potential for having coated pipeline is changed
In generation, calculates the difference for the twice adjacent calculation for having the polarization potential of coated pipeline everywhere described in threshold value, determines institute
State the polarization potential everywhere on coated pipeline.
Further, above-mentioned buried metal pipeline by DC influence computing device, in the fitting module, described
One polarization curve carry out linear fit calculation formula be：Y=a+bx；Wherein, a is the working metal electricity for having coated pipeline
Position；B absolute value | b | for the coating surface resistivity for having coated pipeline；X is the current density for having coated pipeline；Y is
The polarization potential for having coated pipeline.
Further, above-mentioned buried metal pipeline by DC influence computing device, in the initial assignment computing module
In, the coating surface resistivity having in coated pipeline by the big pipeline institute assignment of DC influence is more than by the small pipe of DC influence
The coating surface resistivity of section institute assignment.
Further, above-mentioned buried metal pipeline by DC influence computing device, it is described iterative calculation module in, it is right
During the first time assignment for thering is coated pipeline to carry out, the polarization electricity calculated in the assignment calculating process of the polarization potential is judged
Fitting polarization potential section belonging to position, and determine therefrom that its corresponding coating surface resistivity and working metal electricity
Position with to it is described have coated pipeline carry out assignment；To it is described there is the coated pipeline to carry out follow-up assignment when, once calculated before judging
Fitting polarization potential section belonging to polarization potential, and determine therefrom that its corresponding coating surface resistivity and the metal
Operating potential with to it is described have coated pipeline carry out assignment.
Further, above-mentioned buried metal pipeline by DC influence computing device, it is described iterative calculation module in, institute
Threshold value is stated as 1%.
Further, by the computing device of DC influence, the acquisition module broken above-mentioned buried metal pipeline by coating
The product of second polarization curve of loss rate and metallic conduit obtains first polarization curve.
The computing device provided in the present invention is by acquisition module to there is coated pipeline to obtain first after considering polarity effect
Polarization curve, linear fit is carried out to the first polarization curve by fitting module, by initial assignment computing module 300 to there is painting
The polarization potential of layer pipeline everywhere is roughly calculated, and calculating is iterated to it to obtain by iterating to calculate module 400
Accurate polarization potential.
Further, the present invention considers at pipeline anticorrosion coating breaking point metal with the direct current on soil interface to buried
The influence of metallic conduit, realize the accurate calculating of buried metal pipeline polarization potential everywhere.
Especially, computing device provided by the invention is by considering the calculating of polarity effect so that result of calculation is more sticked on
Nearly actual conditions, further increase the precision of result of calculation, and then reduce the possibility occurrence of galvano-cautery, so as to exactly
Assess the possibility occurrence of galvano-cautery.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, it is various other the advantages of and benefit it is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 is schematic flow sheet of the buried metal pipeline provided in an embodiment of the present invention by the computational methods of DC influence；
Fig. 2 is the relative position schematic diagram of buried metal pipeline provided in an embodiment of the present invention and earthing pole；
Fig. 3 is polarization curve of the Coated Steels of the defeated buried pipeline of length provided in an embodiment of the present invention in 200 Ω m soil
And its linear segmented fitting result；
Fig. 4 is initial assignment provided in an embodiment of the present invention and finally has the polarization potential of coated pipeline after iterative calculation
Distribution results along the line；
Fig. 5 is structured flowchart of the buried metal pipeline provided in an embodiment of the present invention by the computing device of DC influence.
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although the disclosure is shown in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Completely it is communicated to those skilled in the art.It should be noted that in the case where not conflicting, embodiment in the present invention and
Feature in embodiment can be mutually combined.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Embodiment of the method：
Referring to Fig. 1, Fig. 1 is flow of the buried metal pipeline provided in an embodiment of the present invention by the computational methods of DC influence
Schematic diagram.As illustrated, this method may include steps of：
Obtaining step S1, there is the first polarization curve of coated pipeline according to the damaged acquisition for having coated pipeline.
Specifically, for ease of calculating, it will be appreciated by persons skilled in the art that under this condition, on metallic conduit
Accidental distributed coating damage can be by equivalent into being uniformly distributed formula；In view of the concept of current equivalence, there is coated pipeline
First polarization curve can be obtained by coating damage rate and the product of the second polarization curve of metallic conduit；Wherein, coating
Breakage rate can be obtained by the change of experience, standard or actual measurement pipe current demand, and it is not appointed in the present embodiment
What is limited.
With the specified earth current 5000A of earthing pole in the present embodiment, the buried metal material for having coated pipeline is X65 pipelines
It is specifically described exemplified by steel：
There are coated pipeline total length 100km, buried depth 1.5m, soil pH value takes 8.0, and soil resistivity takes 200 Ω m, ground connection
Pole and there is the position relationship between coated pipeline to for details, reference can be made to Fig. 2, wherein, point O indicate on coated pipeline with earthing pole away from
From the midpoint that nearest position is defined as coated pipeline in the calculation, the center of circle of point O ' expression earthing poles, d represents pipeline with connecing
The vertical range in earth polar；The coating for having coated pipeline is thought of as 3PE anticorrosive coats (Layer polyethylene system coating and extruding polyolefin
Coating), the current density according to needed for international standard ISO15589-1-2003 recommends 10 years 3PE pipelines is 0.08mA/
m2, the coating damage rate that can substantially release pipeline coatings is about 0.05%, it can thus be concluded that to X65 Coated Steels in 200 Ω m soil
In polarization curve, for details, reference can be made to Fig. 3.
Fit procedure S2, the first polarization curve segmentation that obtaining step S1 is obtained carry out linear fit, obtain each section of plan
Close coating surface resistivity and working metal current potential and its fitting polarization potential section of line correspondences.
Specifically, first, according to the material for having coated pipeline and this have coated pipeline in different layers soil environment
Polarization curve difference, the first polarization curve for having coated pipeline can be suitably segmented；Then, to every section of curve
Linear fit is carried out, every section of curve matching is straight line, and the calculation formula of every section of straight line can be：Y=a+bx, wherein, a can be set
It is set to the working metal current potential of the segment pipe metal, absolute value | b | it can be set as in polarization potential corresponding to this section of curve
The coating surface resistivity of pipeline in section, x are the current density for having coated pipeline, and y is the polarization potential for having coated pipeline；Most
Afterwards, coating surface resistivity corresponding to each section of fitting a straight line is obtained by the first polarization curve | b | and working metal current potential a, and root
The polarization potential section for calculating each section of fitting a straight line simultaneously is calculated by fitting a straight line according to the value, wherein the painting of each section of fitting a straight line
Aspect resistivity | b |, working metal current potential a and its polarization potential section correspond.
It will be appreciated by persons skilled in the art that the segmentation of polarization curve can determine according to curve, in the present embodiment
Any restriction is not done to it.For example, can rule of thumb it be looked into the first polarization curve of the X65 Coated Steels in 200 Ω m soil
Inquiry data determines that the specific sectional linear fitting of first polarization curve can be divided into four sections, the fitting pole of four sections of fitting a straight lines
Changing potential region is respectively：>- 510mV, -510mV~-730mV, -730mV~-1200mV and<- 1200mV, painting corresponding to it
Aspect resistivity | b | be respectively：30Ω·m2、111Ω·m2、1374Ω·m2With 38 Ω m2, its corresponding working metal electricity
Position a be respectively：- 0.575V, -0.723V, -0.745V and -1.209V, referring specifically to Fig. 3.
Initial assignment calculation procedure S3, to there is coated pipeline to be segmented, obtained according to fit procedure S2 corresponding
Coating surface resistivity and working metal current potential carry out assignment to each pipeline section respectively has the polarization potential of coated pipeline everywhere to calculate.
Specifically, first, determine there is coated pipeline according to the length and the pre-buried length in soil that have coated pipeline
Segmentation and each section of length；Then, in coating surface resistivity corresponding to each fitting a straight lines of fit procedure S2 | b | and metal work
Make in current potential a, choose suitable coating surface resistivity | b | and the coating surface resistivity chosen | b | the fitting a straight line at place
Working metal current potential a carries out assignment to each pipeline section has the polarization potential of coated pipeline everywhere to calculate；Such as can there will be coating
Pipeline is divided into three sections, to middle one section coating surface resistivity | b | and working metal current potential a selections are entered as fit procedure S2 and obtained
To the respective value of wherein one section fitting a straight line be respectively 38 Ω m2With -1.209V.
Step S4 is iterated to calculate, when the polarization having at least one on the coated pipeline electricity that initial assignment calculation procedure S3 is calculated
Position positioned at initial assignment calculation procedure S3 assignment is carried out to it after it is corresponding be fitted outside polarization potential section, to there is coated pipeline
Polarization potential, which is iterated, to be calculated up to having the difference of the twice adjacent calculation of the polarization potential of coated pipeline everywhere in threshold value,
It is determined that there is the polarization potential on coated pipeline everywhere.
Specifically, first, the corresponding fitting of the polarization potential of initial assignment calculation procedure S3 calculating is polarized electric
Whether position section compares, check the polarization potential of calculating in its corresponding fitting polarization potential section；If for example,
Middle one section coating surface resistivity | b | and it is respectively 38 Ω m that working metal current potential a, which chooses,2With -1.209V, then it is corresponding
Fitting polarization potential section be<Whether -1200mV, relatively middle one section of polarization potential calculated everywhere are located at<- 1200mV areas
In；Then, judge to calculate and whether terminate, if each polarization potential calculated be respectively positioned on it is carried out it is corresponding after assignment
It is fitted in polarization potential section, then polarization potential convergence is that each polarization potential that initial assignment calculation procedure S3 is calculated is to have
The actual polarization potential of coated pipeline everywhere, calculating terminate, and otherwise i.e. initial assignment calculation procedure S3 has on coated pipeline at least
After assignment is carried out to it outside corresponding fitting polarization potential section, then polarization potential does not restrain polarization potential at one, needs
Calculating is iterated to the polarization potential for having coated pipeline until there is the adjacent of the polarization potential of coated pipeline everywhere to count twice
The difference of calculation is in threshold value, it is determined that it is to have the actual polarization of coated pipeline everywhere to have the polarization potential on coated pipeline everywhere
Current potential.
In step S4 is iterated to calculate, can by draw curve ratio compared with method and the method for data comparison it is carried out
Whether analysis, the polarization potential for judging to calculate meet the requirements；For example, polarization potential of the X65 Coated Steels in 200 Ω m soil
Analysis can be referring specifically to Fig. 4 by tracing analysis, the curve.It will be appreciated by persons skilled in the art that threshold value can be with
Determined according to actual conditions, do not do any restriction in the present embodiment to it；Preferably, threshold value can be 1%.
It will be appreciated by persons skilled in the art that coating surface resistivity | b | and working metal current potential a is to have coated pipeline
Parameter attribute, relevant with there is the attribute of the tube metal material of coated pipeline and pre-buried soil, polarization potential can be according to painting
Aspect resistivity | b | and working metal current potential a is calculated and determined.For example, calculating of the X65 Coated Steels in 200 Ω m soil can be with
By about 6 calculating, the polarization potential of the pipeline everywhere finally converges to five sections, and each section of polarization potential section is followed successively by：-
510mV~-730mV, -730mV~-1200mV,<- 1200mV, -730mV~-1200mV and -510mV~-730mV；It is involved
Three polarization potentials section corresponding to call by value parameter be respectively：- 510mV~-730mV sections, | b |1=111 Ω m2, a1
=-0.723V；- 730mV~-1200mV sections, | b |2=1374 Ω m2, a2=-0.745V；<- 1200mV sections, | b |3=
38Ω·m2, a3=-1.209V.
It will be readily appreciated that the computational methods provided in the present embodiment pass through to there is coated pipeline to consider polarity effect
After obtain the first polarization curve, by the first polarization curve carry out linear fit, by there is the multiple calculating of coated pipeline
Until the polarization potential calculated meets the requirements, it is final to determine there is the polarization potential of coated pipeline everywhere.
Further, metal and the direct current pair on soil interface at pipeline anticorrosion coating breaking point are considered in the present embodiment
The influence of buried metal pipeline, realize the calculating of buried metal pipeline polarization potential everywhere.
Especially, the computational methods provided in the present embodiment are by considering the calculating of polarity effect so that result of calculation is more
Stick on nearly actual conditions, further increase the precision of result of calculation, and then reduce the possibility occurrence of galvano-cautery, so as to accurate
Really assess the possibility occurrence of galvano-cautery.Done in addition, this method can accurately and effectively calculate buried metal pipeline by direct current
The influence disturbed, there is stronger operability in engineering, be easy to implement.
In the above-described embodiments, in the assignment calculating process of polarization potential, have big by DC influence in coated pipeline
Pipeline section institute assignment coating surface resistivity | b |1Less than the coating surface resistivity by the small pipeline section institute assignment of DC influence | b |2。
Specifically, in initial assignment calculation procedure S3, have in each pipeline section of coated pipeline, big by DC influence
Pipeline section, coating surface resistivity can select less value, then be selected coating surface resistivity larger by the big pipeline section of DC influence
Value.
It will be readily appreciated that by selecting suitable coat side electricity according to by the size of DC influence in the present embodiment
Resistance rate, the computation rate of polarization potential can be accelerated, substantially reduce workload.
In step S4 is iterated to calculate, to have coated pipeline carry out first time assignment when, judge initial assignment calculate step
The fitting polarization potential section belonging to polarization potential that rapid S3 is calculated, and determine therefrom that its corresponding coating surface resistivity and gold
Category operating potential is with to there is coated pipeline to carry out assignment；During to there is coated pipeline to carry out follow-up assignment, once calculated before judging
Fitting polarization potential section belonging to polarization potential, and determine therefrom that its corresponding coating surface resistivity and working metal current potential
With to there is coated pipeline to carry out assignment.
Specifically, in step S4 is iterated to calculate, if polarization potential is not restrained, it is necessary to there is the polarization of coated pipeline
Current potential is iterated calculating；It is iterated in calculating process to it, when carrying out first time assignment to it, first determines whether initial first
The fitting polarization potential section belonging to each polarization potential that beginning assignment calculation procedure S3 is calculated, and the fitting pole according to belonging to it
Change potential region determines the coating surface resistivity at this | b | and working metal current potential a, and in this, as the initial of this assignment
Value；When carrying out follow-up assignment to it, the fitting polarization potential section belonging to the preceding each polarization potential once calculated is first determined whether
And the fitting polarization potential section according to belonging to it determines the coating surface resistivity at this | b | and working metal current potential a, and with this
Initial value as this assignment.For example, in first time assignment, initial assignment calculation procedure S3, which is calculated, to be had one on coated pipeline
The polarization potential of point A points is -1243mV, then the affiliated section of the polarization potential is<In -1200mV sections, then should<- 1200mV areas
Between corresponding coating surface resistivity | b | and working metal current potential a is respectively 38 Ω m2With -1.209V, then during first time assignment
The A point assignment respective value is 38 Ω m2With -1.209V so as to there is coated pipeline to carry out assignment to obtain coated pipeline
Polarization potential；The follow-up Computing Principle carried out to it is identical with first time assignment, and it is not repeated herein.
Obviously it is achieved that, by limiting to accelerate to there is painting there is coated pipeline to carry out assignment in the present embodiment
Layer pipeline is iterated the speed of calculating, so as to improve the efficiency of the polarization potential of coated pipeline calculating.
The computational methods provided in the present embodiment pass through to there is coated pipeline to obtain the first polarization song after considering polarity effect
Line, by carrying out linear fit to the first polarization curve, by having the multiple calculating of coated pipeline until the polarization electricity calculated
Position meets the requirements, final to determine there is the polarization potential of coated pipeline everywhere.
Further, metal and the direct current pair on soil interface at pipeline anticorrosion coating breaking point are considered in the present embodiment
The influence of buried metal pipeline, realize the calculating of buried metal pipeline polarization potential everywhere.
Especially, the computational methods provided in the present embodiment are by considering the calculating of polarity effect so that result of calculation is more
Stick on nearly actual conditions, further increase the precision of result of calculation, and then reduce the possibility occurrence of galvano-cautery, so as to accurate
Really assess the possibility occurrence of galvano-cautery.Done in addition, this method can accurately and effectively calculate buried metal pipeline by direct current
The influence disturbed, there is stronger operability in engineering, be easy to implement.
Device embodiment：
Referring to Fig. 5, Fig. 5 is structure of the buried metal pipeline provided in an embodiment of the present invention by the computing device of DC influence
Block diagram.As illustrated, the device includes：Acquisition module 100, fitting module 200, initial assignment computing module 300 and iteration meter
Calculate module 400.
Specifically, wherein, acquisition module 100, for having the of coated pipeline according to damaged obtain for having a coated pipeline
One polarization curve；Computing module 200, linear fit is carried out for the first polarization curve to be segmented, obtains each section of fitting a straight line pair
The coating surface resistivity and working metal current potential answered and its fitting polarization potential section；Initial assignment computing module 300, for pair
There is coated pipeline to be segmented, each pipeline section is entered respectively according to the corresponding coating surface resistivity and working metal current potential of acquisition
Row assignment has the polarization potential of coated pipeline everywhere to calculate；Module 400 is iterated to calculate, is had for working as at least one on coated pipeline
The polarization potential at place, which is located at corresponding to it, to be fitted outside polarization potential section, and calculating is iterated to the polarization potential for having coated pipeline
Until there is the difference of the twice adjacent calculation of the polarization potential of coated pipeline everywhere in threshold value, it is determined that having on coated pipeline everywhere
Polarization potential.
Wherein, the specific implementation process of the device is referring to the explanation in above method embodiment, and the present embodiment is herein
Repeat no more.
It will be readily appreciated that the computing device provided in the present embodiment by acquisition module 100 to there is coated pipeline
The first polarization curve is obtained after considering polarity effect, linear fit is carried out to the first polarization curve by fitting module 200, passed through
Initial assignment computing module 300 is to there is the polarization potential of coated pipeline to be everywhere roughly calculated, by iterating to calculate module 400
Calculating is iterated to it to obtain accurate polarization potential.
Further, metal and the direct current pair on soil interface at pipeline anticorrosion coating breaking point are considered in the present embodiment
The influence of buried metal pipeline, realize the accurate calculating of buried metal pipeline polarization potential everywhere.
Especially, the computing device provided in the present embodiment is by considering the calculating of polarity effect so that result of calculation is more
Stick on nearly actual conditions, further increase the precision of result of calculation, and then reduce the possibility occurrence of galvano-cautery, so as to accurate
Really assess the possibility occurrence of galvano-cautery.
Specifically, in fitting module 200, the calculation formula that the first polarization curve carries out linear fit is：
Y=a+bx；
Wherein, a is the working metal current potential for having coated pipeline；B absolute value | b | it is the coating surface resistance for having coated pipeline
Rate；X is the current density for having coated pipeline；Y is the polarization potential for having coated pipeline.
Specifically, in initial assignment computing module 300, have in coated pipeline by the pipeline section institute assignment that DC influence is big
Coating surface resistivity | b |1Less than the coating surface resistivity by the big pipeline section institute assignment of DC influence | b |2。
It will be readily appreciated that by selecting suitable coat side electricity according to by the size of DC influence in the present embodiment
Resistance rate, the rate of convergence of polarization potential can be accelerated, substantially reduce workload.
In module 400 is iterated to calculate, during to there is first time assignment that coated pipeline is carried out, the assignment of polarization potential is judged
Fitting polarization potential section belonging to the polarization potential calculated in calculating process, and determine therefrom that its corresponding coating surface resistance
Rate and working metal current potential are with to there is coated pipeline to carry out assignment；During to there is coated pipeline to carry out follow-up assignment, before judging once
Fitting polarization potential section belonging to the polarization potential of calculating, and determine therefrom that its corresponding coating surface resistivity and metal work
Make current potential with to there is coated pipeline to carry out assignment.
Wherein, the specific implementation process of the iterative calculation module 400 is referring to the explanation in above method embodiment, sheet
Embodiment will not be repeated here.
Obviously it is achieved that, by limiting to accelerate to there is painting there is coated pipeline to carry out assignment in the present embodiment
Layer pipeline is iterated the speed of calculating, so as to improve the efficiency of the polarization potential of coated pipeline calculating.
Specifically, in module 400 is iterated to calculate, threshold value 1%.
Specifically, acquisition module 100 is obtained by coating damage rate and the product of the second polarization curve of metallic conduit
First polarization curve.
It will be readily appreciated that the computing device provided in the present embodiment by acquisition module 100 to there is coated pipeline
The first polarization curve is obtained after considering polarity effect, linear fit is carried out to the first polarization curve by fitting module, by first
Beginning assignment computing module is carried out to there is the polarization potential of coated pipeline to be everywhere roughly calculated by iterating to calculate module to it
Iterate to calculate to obtain accurate polarization potential.
Further, metal and the direct current pair on soil interface at pipeline anticorrosion coating breaking point are considered in the present embodiment
The influence of buried metal pipeline, realize the accurate calculating of buried metal pipeline polarization potential everywhere.
Especially, the computing device provided in the present embodiment is by considering the calculating of polarity effect so that result of calculation is more
Stick on nearly actual conditions, further increase the precision of result of calculation, and then reduce the possibility occurrence of galvano-cautery, so as to accurate
Really assess the possibility occurrence of galvano-cautery.
It should be noted that the computational methods and buried metal pipeline of buried metal pipeline in the present invention by DC influence
Computing device principle by DC influence is similar, and related part can be with cross-referenced.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, the application can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the application can use the computer for wherein including computer usable program code in one or more
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (12)
1. a kind of buried metal pipeline is by the computational methods of DC influence, it is characterised in that comprises the following steps：
Damaged acquisition according to there is coated pipeline has the first polarization curve of coated pipeline；
First polarization curve obtained in above-mentioned first polarization curve acquisition process is segmented and carries out linear fit, is obtained each
Coating surface resistivity and working metal current potential corresponding to section fitting a straight line and its fitting polarization potential section；
There is coated pipeline to be segmented to described, according to obtained during above-mentioned first parameter fitting it is corresponding described in
Coating surface resistivity and the working metal current potential carry out assignment to each pipeline section respectively described has coated pipeline everywhere to calculate
Polarization potential；
When have described in calculating the polarization potential at least one on coated pipeline positioned at assignment is carried out to it after the corresponding plan
Close outside polarization potential section, calculating is iterated to the polarization potential for having coated pipeline until described have coated pipeline everywhere
The polarization potential twice adjacent calculation difference in threshold value, it is determined that the pole having on coated pipeline everywhere
Change current potential.
2. buried metal pipeline according to claim 1 is by the computational methods of DC influence, it is characterised in that described first
In the fit procedure of polarization curve, the calculation formula that first polarization curve carries out linear fit is：
Y=a+bx,
Wherein, a is the working metal current potential for having coated pipeline；B absolute value | b | for the coat side for having coated pipeline
Resistivity；X is the current density for having coated pipeline；Y is the polarization potential for having coated pipeline.
3. buried metal pipeline according to claim 1 is by the computational methods of DC influence, it is characterised in that in the pole
It is described to have in coated pipeline by the coating of the big pipeline section institute assignment of DC influence in the initial assignment calculating process for changing current potential
Surface resistivity is less than the coating surface resistivity by the small pipeline section institute assignment of DC influence.
4. buried metal pipeline according to any one of claims 1 to 3 is existed by the computational methods of DC influence, its feature
In, in the iterative process of the polarization potential,
During to the first time assignment for thering is coated pipeline to carry out, judge what is calculated in the assignment calculating process of the polarization potential
Fitting polarization potential section belonging to polarization potential, and determine therefrom that its corresponding coating surface resistivity and the metal
Operating potential with to it is described have coated pipeline carry out assignment；
To it is described there is the coated pipeline to carry out follow-up assignment when, the fitting polarization potential before judging belonging to the polarization potential that once calculates
Section, and its corresponding coating surface resistivity and the working metal current potential are determined therefrom that to have coated pipeline to described
Carry out assignment.
5. buried metal pipeline according to any one of claims 1 to 3 is existed by the computational methods of DC influence, its feature
In in the iterative process of the polarization potential, the threshold value is 1%.
6. buried metal pipeline according to any one of claims 1 to 3 is existed by the computational methods of DC influence, its feature
In in the acquisition process of first polarization curve, passing through multiplying for the second polarization curve of coating damage rate and metallic conduit
Product obtains first polarization curve.
7. a kind of buried metal pipeline is by the computing device of DC influence, it is characterised in that including：
Acquisition module, for there is the first polarization curve of coated pipeline according to the damaged acquisition for having coated pipeline；
Fitting module, linear fit is carried out for first polarization curve to be segmented, obtain and applied corresponding to each section of fitting a straight line
Aspect resistivity and working metal current potential and its fitting polarization potential section；
Initial assignment computing module, for there is coated pipeline to be segmented, according to the corresponding coat side electricity of acquisition
Resistance rate and the working metal current potential carry out assignment to each pipeline section respectively described has the polarization potential of coated pipeline everywhere to calculate；
Module is iterated to calculate, it is right after assignment is carried out to it for there is the polarization potential at least one on coated pipeline to be located at described in
Outside the fitting polarization potential section answered, calculating is iterated to the polarization potential for having coated pipeline until described have painting
The difference of the twice adjacent calculation of the polarization potential of layer pipeline everywhere is in threshold value, it is determined that described have on coated pipeline everywhere
The polarization potential.
8. buried metal pipeline according to claim 7 is by the computing device of DC influence, it is characterised in that in the plan
In matched moulds block, the calculation formula that first polarization curve carries out linear fit is：
Y=a+bx,
Wherein, a is the working metal current potential for having coated pipeline；B absolute value | b | for the coat side for having coated pipeline
Resistivity；X is the current density for having coated pipeline；Y is the polarization potential for having coated pipeline.
9. buried metal pipeline according to claim 7 is by the computing device of DC influence, it is characterised in that described first
In beginning assignment computing module, it is described have it is small by the coating surface resistivity of the big pipeline section institute assignment of DC influence in coated pipeline
In the coating surface resistivity by the small pipeline section institute assignment of DC influence.
10. buried metal pipeline according to any one of claim 7 to 9 is existed by the computing device of DC influence, its feature
In, in the iterative calculation module,
During to the first time assignment for thering is coated pipeline to carry out, judge what is calculated in the assignment calculating process of the polarization potential
Fitting polarization potential section belonging to polarization potential, and determine therefrom that its corresponding coating surface resistivity and the metal
Operating potential with to it is described have coated pipeline carry out assignment；
To it is described there is the coated pipeline to carry out follow-up assignment when, the fitting polarization potential before judging belonging to the polarization potential that once calculates
Section, and its corresponding coating surface resistivity and the working metal current potential are determined therefrom that to have coated pipeline to described
Carry out assignment.
11. buried metal pipeline according to any one of claim 7 to 9 is existed by the computing device of DC influence, its feature
In in the iterative calculation module, the threshold value is 1%.
12. buried metal pipeline according to any one of claim 7 to 9 is existed by the computing device of DC influence, its feature
In the acquisition module obtains the first polarization song by coating damage rate and the product of the second polarization curve of metallic conduit
Line.
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