CN107937921B - A kind of means of defence for preventing direct current earth current from influencing on Metal pipeline corrosion - Google Patents
A kind of means of defence for preventing direct current earth current from influencing on Metal pipeline corrosion Download PDFInfo
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- CN107937921B CN107937921B CN201711204930.9A CN201711204930A CN107937921B CN 107937921 B CN107937921 B CN 107937921B CN 201711204930 A CN201711204930 A CN 201711204930A CN 107937921 B CN107937921 B CN 107937921B
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- resistant protective
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/20—Conducting electric current to electrodes
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/04—Controlling or regulating desired parameters
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/10—Controlling or regulating parameters
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
- C23F2213/32—Pipes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a kind of means of defences for preventing electric system earth current from influencing on metallic conduit.The method is the following steps are included: according to Practical Project parameter model, the numerical value of simulation analysis leakage current density of pipeline when not increasing resistance protective layer；The multiple for needing to limit corrosion current is determined according to corrosive pipeline size of current；Then the size of current for needing to limit after resistance layer is increased in determination；The numerical value that leakage current density should be reduced to after laying high resistant protective layer is calculated；The numerical value of leakage current density on pipeline after high resistant protective layer is added in simulation calculation；Whether the numerical value that comparing the numerical value of Leakage Current density on pipeline after the addition high resistant protective layer being calculated should reduce with leakage current density calculated approaches, and the resistivity and thickness of high resistant protective layer are adjusted according to comparison result.The method has stronger applicability, is avoided that most pipelines are influenced by electric system earth current, is provided simultaneously with the advantages that later maintenance is simple.
Description
Technical field
The present invention relates to the field that HVDC transmission system influences underground metal piping system, more particularly to one kind are anti-
The only means of defence that direct current earth current influences Metal pipeline corrosion.
Background technique
With the continuous development of China's power grid, D.C. high voltage transmission because of its advantage on long-distance and large-capacity power transmission,
It has been more and more widely used.DC transmission engineering built at present is nearly all the side using bipolar both ends neutral ground
Formula, this mode allow to run using monopolar ground return.Under the monopolar ground return method of operation, direct current system has very big
DC current flow into the earth, heavy corrosion can be generated to the metal oil-gas pipeline in nearby, threat tube operates normally.
Currently, being directed to influence of the earth current to metallic conduit, there are mainly three types of means of defences: 1) Jona's method.It is logical
Crossing reduces pipeline potential difference for duct segments, reduces the electric current for flowing through pipeline thus the corrosion for weakening pipeline.The method can not only
Weaken the corrosion of pipeline, moreover it is possible to reduce pipe to soil potential, but respective location will appear abnormal rise situation, and insulating joint price
Height, O&M investment is big, other safeguard procedures need to be cooperated to be used together.2) electric drainage by grounding method.Using the principle of sacrificial anode, use
The metal that the activity such as zinc, magnesium are better than iron is corroded instead of steel pipe.Earthing mode optional pipeline all insulation, connects distal end ground connection entirely
Three kinds of ground, wherein full ground connection influences caused by earth current, the effect inhibited is best, but the cathode that can shorten pipeline itself is protected
The protection scope for protecting equipment also will increase the stray electrical current of pipeline absorption.3) cathode current method is forced.This method is actually
Cathode protection method makes sense of current flow ipe by the DC power supply pressure applied outside, flows out from impressed current anode.This method pair
Cathodic protection plant capacity is more demanding, is generally mated other pipeline protection measures use.Each measure is needed because of its applicability difference
It is selected according to different condition, it is complex, it is proposed that a kind of stronger method of versatility protects pipeline.
Summary of the invention
In order to solve the above problem present in existing metallic conduit guard technology, the present invention, which provides one kind, prevents power train
The means of defence that system earth current influences metallic conduit, this method hinder D.C. high voltage transmission by burying high resistant protective layer
The earth current of system flows to metallic conduit surface, so that effect of the metallic conduit not by earth current electrochemical corrosion is protected,
It is versatile.
The present invention solves above-mentioned technical problem using following technical scheme: one kind prevents electric system earth current to gold
The means of defence that metal conduit influences, includes the following steps:
S1, according to direct current transportation earthed system parameter in Practical Project, earthing pole surrounding conduit parameter, earthing pole around
Soil model establishes earthing pole pipe-line system model, the leakage current density of simulation analysis pipeline when not increasing resistance protective layer
Numerical value；
S2, according to the corrosion condition in Practical Project on pipeline, determine the corrosion current size on pipeline, in conjunction with electric current corruption
The related standard limit of pipeline is lost, determines the multiple for needing to limit corrosion current；
S3, obtained in the step S1 and step S2 without high resistant protective layer when pipeline leakage current density and need to reduce
Corrosion current numerical value, the numerical value that should be reduced to of leakage current density after laying high resistant protective layer is calculated；
S4, high resistant protective layer is added on the pipeline in the earthing pole pipe-line system model, determines high resistant according to estimating
The numerical value of leakage current density on pipeline after high resistant protective layer is added in the resistivity and its thickness of protective layer, simulation calculation；
S5, the numerical value and step that leakage current density on pipeline after high resistant protective layer is added that will be calculated in step S4
The numerical value that leakage current density should reduce in S3 compares, if the two is closer to, the high resistant protective layer that will currently select
Resistivity and thickness parameter as final argument；If step S4 numerical value calculated is greater than step S3 numerical value calculated,
Increase the resistivity and thickness of high resistant protective layer, repeats step S4；If step S4 numerical value calculated is counted much smaller than step S3
The numerical value of calculation then reduces the resistivity and thickness of high resistant protective layer, repeats step S4.
Preferably, the earthing pole pipe-line system model is established in CDEGS.
Preferably, the resistivity of the high resistant protective layer and its thickness are obtained by CDEGS simulation calculation.
As can be known from the above technical solutions, the present invention acquires when not adding protective layer first according to Practical Project parameter model
Leakage current density；Determine that high resistant protective layer protects multiple then according to practical corrosion current size；Then resistance layer is increased in determination
The size of current for needing to limit afterwards；The resistivity and thickness parameter of high resistant protective layer are obtained further according to simulation calculation；Compare calculating
The numerical value Yu leakage current density calculated of Leakage Current density should reduce on pipeline after obtained addition high resistant protective layer
Whether numerical value approaches, and the resistivity and thickness of high resistant protective layer are adjusted according to comparison result.Compared with prior art, of the invention
It has the following advantages and beneficial effects:
1, there is stronger applicability, be avoided that most pipelines are influenced by electric system earth current, have simultaneously
The standby advantages such as later maintenance is convenient for management, maintenance cost is low.
2, versatility is stronger, and corruption of the direct current earth current to metallic conduit can be effectively reduced under different soil
Erosion.
Detailed description of the invention
Fig. 1 is D. C. Electric transmission earthed pole and pipe-line system illustraton of model；
Fig. 2 is the structural schematic diagram of high resistant protective layer protection metallic conduit.
Specific embodiment
Below with reference to examples and drawings, the invention patent is further described in detail, but embodiments of the present invention
It is without being limited thereto.
The means of defence that the present invention prevents electric system earth current from influencing on metallic conduit, includes the following steps:
S1, according to direct current transportation earthed system parameter in Practical Project, earthing pole surrounding conduit parameter, earthing pole around
Soil model etc., establishes earthing pole pipe-line system model in CDEGS, and simulation analysis pipeline when not increasing resistance protective layer is let out
The numerical value of leakage current density.
In the present embodiment, according to ichthyosauru ridge earthing pole and the second west to east gas pipeline project pipe parameter, direct current transportation ground connection is established
Pole and pipe-line system model are as shown in Figure 1.Wherein, ichthyosauru ridge ground connection extremely 940 polar ring of Φ and 700 polar ring of Φ is together to form
Double annulus earthing poles, inner and outer ring buried depth are respectively 3.5m and 4m, and maximum allowable earth current is 3470.5A.Pipeline is by two sections points
The part of not long 6km and 14.1km forms, and is about 9km at a distance from pipeline and earthing pole are nearest.Soil is multilayer extracting, point
Layer soil resistivity is as shown in table 1:
1 stratified soil resistivity of table
It is 2.9mA/m that simulation calculation, which obtains pipeline maximum leakage current density,2。
S2, according to the corrosion condition in Practical Project on pipeline, determine the corrosion current size on pipeline, in conjunction with electric current corruption
The related standard limit of pipeline is lost, determines the multiple for needing to limit corrosion current.
The present embodiment is according to the typical case of pipeline anticorrosion coating notch, it is assumed that there are a diameter d is lacking for 2cm on pipeline
Mouthful, indentation, there pipeline potential shift Δ U takes threshold limit value 100mV, then the corrosion electric current density J of the indentation, there can be counted as the following formula
It calculates:
It is 0.18A/m that corrosion electric current density J, which is calculated,2, according to China's power industry relevant criterion " D.C. high voltage transmission
The earth returns to operating system designing technique regulation " regulation, leakage current should be less than 0.01A/m in (DL/T5224-2014)2, because
Leakage current need to be reduced to original 1/18 by this, it is made to meet standard limit.
S3, obtained in the step S1 and step S2 without high resistant protective layer when pipeline leakage current density and need to reduce
Corrosion current numerical value, the numerical value that should be reduced to of leakage current density after laying high resistant protective layer is calculated.
According to the data calculated in step S1 and step S2, in order to which corrosion current to be reduced within the scope of regulation, need to be arranged
High resistant protective layer makes the leakage current density on pipeline be less than 0.16mA/m2。
S4, high resistant protective layer is added on the pipeline in CDEGS earthing pole pipe-line system model, determines high resistant according to estimating
The numerical value of leakage current density on pipeline after high resistant protective layer is added in the resistivity and its thickness of protective layer, simulation calculation.
Taking high resistant protection layer resistivity is that 20k Ω m imitates the leakage current density on pipeline with a thickness of 1m again
True to calculate, it is 0.31mA/m that maximum leakage current density, which is calculated,2。
Be additionally arranged the pipeline configuration of high resistant protective layer as shown in Fig. 2, high resistant protective layer 2 be coated in 1 outer surface of metallic conduit,
Each arrow 3 is current direction.
S5, the numerical value and step that leakage current density on pipeline after high resistant protective layer is added that will be calculated in step S4
The numerical value that leakage current density should reduce in S3 compares, if the two is closer to, the high resistant protective layer that will currently select
Resistivity and thickness parameter as final argument；If step S4 numerical value calculated is greater than step S3 numerical value calculated,
Increase the resistivity and thickness of high resistant protective layer, repeats step S4；If step S4 numerical value calculated is counted much smaller than step S3
The numerical value of calculation then reduces the resistivity and thickness of high resistant protective layer, repeats step S4.
In the present embodiment, due to having added maximum leakage current density after the high resistant protective layer to be still unsatisfactory for requiring, by high resistant
Protection layer resistivity increases to 41k Ω m, repeats step S4, maximum leakage current density on pipeline is calculated and is reduced to
0.16mA/m2, therefore selecting high resistant protection layer resistivity is 41k Ω m, with a thickness of 1m.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (3)
1. a kind of means of defence for preventing electric system earth current from influencing on metallic conduit, which is characterized in that including walking as follows
It is rapid:
S1, according to the soil around direct current transportation earthed system parameter in Practical Project, earthing pole surrounding conduit parameter, earthing pole
Model establishes earthing pole pipe-line system model, the number of simulation analysis leakage current density of pipeline when not increasing resistance protective layer
Value；
S2, according to the corrosion condition in Practical Project on pipeline, the corrosion current size on pipeline is determined, in conjunction with electrolytic corrosion pipe
The related standard limit in road determines the multiple for needing to limit corrosion current；
S3, obtained in the step S1 and step S2 without high resistant protective layer when pipeline leakage current density and the corruption that need to reduce
Current values are lost, the numerical value that leakage current density should be reduced to after laying high resistant protective layer is calculated；
S4, high resistant protective layer is added on the pipeline in the earthing pole pipe-line system model, determines high resistant protection according to estimating
The numerical value of leakage current density on pipeline after high resistant protective layer is added in the resistivity and its thickness of layer, simulation calculation；
S5, it is added what is be calculated in step S4 after high resistant protective layer on pipeline in the numerical value and step S3 of leakage current density
The numerical value that leakage current density should reduce compares, if the two is closer to, by the electricity of the high resistant protective layer currently selected
Resistance rate and thickness parameter are as final argument；If step S4 numerical value calculated is greater than step S3 numerical value calculated, increase
The resistivity and thickness of high resistant protective layer repeat step S4；If step S4 numerical value calculated is calculated much smaller than step S3
Numerical value then reduces the resistivity and thickness of high resistant protective layer, repeats step S4.
2. the means of defence according to claim 1 for preventing electric system earth current from influencing on metallic conduit, feature
It is, the earthing pole pipe-line system model is established in CDEGS.
3. the means of defence according to claim 1 for preventing electric system earth current from influencing on metallic conduit, feature
It is, the resistivity and its thickness of the high resistant protective layer are obtained by CDEGS simulation calculation.
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| CN201711204930.9A CN107937921B (en) | 2017-11-27 | 2017-11-27 | A kind of means of defence for preventing direct current earth current from influencing on Metal pipeline corrosion |
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| CN201711204930.9A CN107937921B (en) | 2017-11-27 | 2017-11-27 | A kind of means of defence for preventing direct current earth current from influencing on Metal pipeline corrosion |
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| CN107937921B true CN107937921B (en) | 2019-08-30 |
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| CN114606500B (en) * | 2020-12-09 | 2024-03-01 | 中国石油天然气集团有限公司 | Buried pipeline direct current stray current protection scheme determination method, device and equipment |
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