CN109371402A - A kind of adjustable cathodic protection by rectifier system - Google Patents
A kind of adjustable cathodic protection by rectifier system Download PDFInfo
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- CN109371402A CN109371402A CN201811502050.4A CN201811502050A CN109371402A CN 109371402 A CN109371402 A CN 109371402A CN 201811502050 A CN201811502050 A CN 201811502050A CN 109371402 A CN109371402 A CN 109371402A
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- Prior art keywords
- power source
- cathodic protection
- additional power
- anode
- rectifier system
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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
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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)
Abstract
A kind of adjustable cathodic protection by rectifier system includes: additional power source, and cathode is electrically connected protected underwater ball valve manifold, the cathode of the protected underwater ball valve manifold as additional power source；Impressed current anode groundbed is electrically connected the anode of additional power source, the anode as additional power source.The scope of the present invention is big, and small, good economy performance is influenced by environmental resistivity, and the protective device service life is long.
Description
Technical field
The present invention relates to underwater oil equipment anticorrosion technique more particularly to a kind of adjustable cathodic protection by rectifier systems
System.
Background technique
In underwater ball valve and the underwater environment of pipeline can and the media such as surrounding seawater occur chemistry or electrochemical action and
Lead to the consumption or destruction that material is meaningless, to influence service life.In order to avoid this phenomenon, scene need to take cathodic protection
Measure.
Currently used cathode protection measure is the cathode protection method of sacrificial anode, using the stronger metal of reproducibility as guarantor
Pole is protected, constitutes primary battery with being connected by protection metal, the stronger metal of reproducibility will occur oxidation reaction as cathode and consume,
Protected metal can be to avoid corrosion as anode.Its shortcoming is that: 1. lower driving voltage/electric currents；2. for bad
The works of matter coating needs more anode；3. may be invalid under high-resistance soil environment；4. due to lower
Current efficiency (self-corrosion consumption), every Ampere currents expense are higher than impressed current cathodic protection；5. replacement is with useless anode
Difficult or expensive.
Summary of the invention
The present invention provides a kind of adjustable cathodic protection by rectifier system, and protection scope is big, by environmental resistivity shadow
Small, good economy performance is rung, the protective device service life is long.
In order to achieve the above object, the present invention provides a kind of adjustable cathodic protection by rectifier system, includes:
Additional power source, cathode are electrically connected protected underwater ball valve manifold, which makees
For the cathode of additional power source；
Impressed current anode groundbed is electrically connected the anode of additional power source, the anode as additional power source.
The additional power source uses potentiostat.
The impressed current anode groundbed includes:
It is grounded steel plate, is arranged at the bottom, is electrically connected the ground terminal of additional power source；
Anode bed is arranged at the bottom, is electrically connected the anode output end of additional power source.
The anode bed using the titanium perhaps platinum plating of platinum plating the tantalum perhaps niobium of platinum plating or lead-silver anode.
The cathodic protection by rectifier system also includes reference electrode, is electrically connected the reference electrode of additional power source
End, for calculating the electrode potential of tested fixed electrode.
The reference electrode is arranged at the unearthed point of protected underwater ball valve manifold, or at burying, or buries
Near point.
The reference electrode uses copper sulfate reference electrode.
The cathodic protection by rectifier system also includes multiple test piles.
The test pile includes: potential test stake, testing current stake, casing potential test pile, and insulating joint current potential is surveyed
Test pile.
The present invention has the advantage that compared to the cathode protection method of sacrificial anode
1, protection scope is big；
2, it is influenced by environmental resistivity small；
3, the bigger engineering the more economical；
4, the protective device service life is long.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of adjustable cathodic protection by rectifier system provided by the invention.
Fig. 2 is the connection schematic diagram of additional power source.
Specific embodiment
Below according to FIG. 1 to FIG. 2, presently preferred embodiments of the present invention is illustrated.
Cathodic protection is using metal surface each point current potential is reached unanimously, to reduce the loss of electronics to slow down metal corruption
Erosion.The cathodic protection of additional power source, which refers to by buried impressed current anode, by protective current, introduces underground, is supplied to by soil
It is still cathode in the earth by protection metal, surface only occurs reduction reaction, will not lose metal again by protection metal
The oxidation reaction of ion, corrosion are suppressed.And betatopic oxidation reaction then occurs for impressed current anode surface.
As depicted in figs. 1 and 2, the present invention provides a kind of adjustable cathodic protection by rectifier system, includes:
Additional power source 1, cathode are electrically connected protected underwater ball valve manifold；
Impressed current anode groundbed 2 is electrically connected the anode of additional power source 1.
The cathodic protection by rectifier system also includes: reference electrode 3 and multiple test piles 4.
Additional power source 1 is the heart of cathodic protection by rectifier technology, and effect is incessantly to by protection metal knot
Structure object provides cathodic protection current.With the development of power supply and electronic technology, the power supply of impressed current cathodic protection be experienced
The course of dc generator, rectifier, potentiostat, what is be used widely at present is rectifier and potentiostat.In this reality
It applies in example, in order to can satisfy the Functional Requirement according to actual condition automatic regulating system, using potentiostat as additional
Power supply.Because potentiostat has constant potential, constant-current characteristic, so as to meet the function according to actual condition automatic regulating system
Energy property requirement, therefore cathodic protection current is provided to by protection metallic structures incessantly in this as the power supply of system.
Potentiostat is integrally exactly a negative-feedback amplification output system, has two kinds of operating statuses of constant potential and constant current
It is changeable.Potentiostat and protected object (such as buried pipeline) constitute closed loop and adjust, and the point current potential that is powered is measured by reference electrode,
It is compared as sampled signal with control signal, realization controls and adjusts polarization current output, and an energization point current potential is enable to protect
It holds on the controlling potential of setting.And once constant potential goes wrong, such as interfere, reference electrode damage etc., at this moment need
Switch to constant current operating status, constant current output, that is to say, that electric current exports constant, voltage change.
1, constant potential operating status: when potentiostat is in " automatic " working condition, Setting signal (control letter in machine
Number) or external control Setting signal and the reference signal after impedance transformer is isolated be sent into comparison amplifier together, through high-precision, high
The comparison amplifier of stability compares amplification, and output error controls signal, this signal is sent into phase shift trigger, phase shift trigger
According to the size of the signal, the phase shift time of pulse is automatically adjusted, trigger pulse adjustment is exported by pulse transformer and is polarized back
The silicon-controlled angle of flow in road changes the size of output voltage, electric current, and protection potential is made to be equal to the given current potential of setting, thus
Realize constant potential protection.
2, switch to constant current operational mode: when potentiostat work constant potential state and because reference failure or it is other therefore
When barrier causes instrument to can not achieve constant potential control, after certain time postpones, potentiostat confirms that collected signal belongs in fact
Constant potential error signal out of control, will just be automatically converted to constant current working condition.It constant current Setting signal and is converted through impedance
Output current sampling signal is sent into comparison amplifier together afterwards, and comparison amplifier output error control signal passes through phase shift trigger
The size for adjusting the silicon-controlled angle of flow makes the constant output current of instrument on preset current value.
As shown in Fig. 2, the zero-bit of potentiostat 1 is connected with cathode end by protective (underwater ball valve manifold), then by
Cathode of the protective as potentiostat.
As shown in Fig. 2, the impressed current anode groundbed 2 includes:
It is grounded steel plate 201, setting is electrically connected the ground terminal of potentiostat 1 at the bottom；
Anode bed 202, setting are electrically connected the anode output end of potentiostat 1 at the bottom.
Impressed current anode groundbed 2 has the function of contact of the increase anode with soil, and protective current is introduced soil from power supply
In electric conductor.Protective current is sent into soil by impressed current anode, protected underwater ball valve manifold is flowed into through soil, makes water
Lower ball valve manifold surface carries out cathodic polarization (preventing electrochemical corrosion), and electric current flows into additional power source by underwater ball valve manifold again and bears
Pole forms a circuit, this primary Ioops forms an electrolytic cell, and underwater ball valve manifold is that cathode is in reduction ring in the loop
In border, prevent from corroding, and impressed current anode groundbed 2 carries out oxidation reaction and is corroded.
In the present embodiment, because surrounding enviroment are seawater, therefore anode bed 202 is mostly using the titanium of platinum plating, tantalum or
Niobium, lead-silver anode monthly need the ground resistance of impressed current anode groundbed 2 of measurement.
As shown in Fig. 2, reference electrode 3 is electrically connected the reference electrode end of potentiostat 1.Reference electrode is the various electricity of measurement
As referring to the electrode compared when electrode potential, the reference electrode of measured electrode and accurately known electrode potential numerical value is constituted
Battery measures cell emf numerical value, so that it may calculate the electrode potential of tested fixed electrode.The reference electrode of potentiostat selects
The installation site selected is at the unearthed point of protected underwater ball valve manifold, or at burying, or buries near a little, away from pipeline
10cm (is powered near point).The basic demand of reference electrode is that polarization is small, stability is good, and the polarization of copper sulfate reference electrode allows
Amount is ± 10mV.
The test pile 4 includes: potential test stake, testing current stake, casing potential test pile, and insulating joint current potential is surveyed
Test pile.In the present embodiment, in order to detect the cathodic protection system of service conduit, electric current and potential test are set along pipeline
Stake, one potential test stake of every kilometer of setting, every five kilometers set a testing current stake, and a casing electricity is arranged at each casing
Bit test stake, each insulation position set an insulating joint potential test stake, monthly measure a cathodic protection potential.
Workflow of the invention is as follows:
Pipeline natural potential test is first carried out before energization to be joined that is, in the case where cathodic protection is not carried out with copper sulphate
Than the current potential of test pile (test pile is connect with the manifold that need to be protected) along electrode survey, current potential is generally -0.4V~-0.6V.
After the completion of natural potential test, simultaneously by given control voltage (according to field pipes actual conditions) of remote console
It opens the constant protection voltage of potentiostat output, after the numerical stabilities such as output voltage on dial plate to be controlled, carries out pipeline guarantor
Protect potential test, i.e., in the case where applying cathodic protection, with copper sulfate reference electrode survey along test pile current potential, current potential answers
In -0.85V~-1.5V.Decision-making system works normally under constant potential operating status if data are met the requirements.
When potentiostat work is in constant potential state and because reference failure or other failures cause instrument to can not achieve permanent electricity
Position control when, through potentiostat acquisition signal be determined as constant potential it is out of control after, potentiostat automatically switches into constant current mode, after
It is continuous to provide cathodic protection to underwater ball valve manifold.
The scope of the present invention is big, and small, good economy performance is influenced by environmental resistivity, and the protective device service life is long, main to apply
The cathodic protection of large-scale petroleum drilling-production equipment under Yu Haiyang, for example, it is underwater long range On The Oil And Gas Transportation industrial pipeline, underwater ball valve, big
Type underwater storage tank group etc..
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (9)
1. a kind of adjustable cathodic protection by rectifier system, characterized by comprising:
Additional power source (1), cathode are electrically connected protected underwater ball valve manifold, the protected underwater ball valve manifold conduct
The cathode of additional power source (1)；
Impressed current anode groundbed (2) is electrically connected the anode of additional power source (1), the anode as additional power source (1).
2. adjustable cathodic protection by rectifier system as described in claim 1, which is characterized in that the additional power source
(1) potentiostat is used.
3. adjustable cathodic protection by rectifier system as described in claim 1, which is characterized in that the impressed current anode
Groundbed (2) includes:
It is grounded steel plate (201), setting is electrically connected the ground terminal of additional power source (1) at the bottom；
Anode bed (202), setting are electrically connected the anode output end of additional power source (1) at the bottom.
4. adjustable cathodic protection by rectifier system as claimed in claim 3, which is characterized in that the anode bed
(202) using the tantalum perhaps niobium of platinum plating or the lead-silver anode of the perhaps platinum plating of the titanium of platinum plating.
5. adjustable cathodic protection by rectifier system as described in claim 1, which is characterized in that the additional power source
Cathodic protection system also includes reference electrode (3), is electrically connected the reference electrode end of additional power source (1), tested for calculating
The electrode potential of fixed electrode.
6. adjustable cathodic protection by rectifier system as claimed in claim 5, which is characterized in that the reference electrode
(3) it is arranged at the unearthed point of protected underwater ball valve manifold, or at burying, or buries near a little.
7. adjustable cathodic protection by rectifier system as claimed in claim 6, which is characterized in that the reference electrode
(3) copper sulfate reference electrode is used.
8. adjustable cathodic protection by rectifier system as described in claim 1, which is characterized in that the additional power source
Cathodic protection system also includes multiple test piles (4).
9. adjustable cathodic protection by rectifier system as claimed in claim 8, which is characterized in that the test pile
(4) include: potential test stake, testing current stake, casing potential test pile, insulating joint potential test stake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811502050.4A CN109371402A (en) | 2018-12-10 | 2018-12-10 | A kind of adjustable cathodic protection by rectifier system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811502050.4A CN109371402A (en) | 2018-12-10 | 2018-12-10 | A kind of adjustable cathodic protection by rectifier system |
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| Publication Number | Publication Date |
|---|---|
| CN109371402A true CN109371402A (en) | 2019-02-22 |
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| CN201811502050.4A Pending CN109371402A (en) | 2018-12-10 | 2018-12-10 | A kind of adjustable cathodic protection by rectifier system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575716A (en) * | 2020-05-09 | 2020-08-25 | 中核武汉核电运行技术股份有限公司 | Nuclear power plant buried pipeline cathodic protection effectiveness monitoring system |
| CN114216842A (en) * | 2021-12-24 | 2022-03-22 | 华中科技大学 | Online monitoring device and method for electrifying efficiency of reinforced concrete during accelerated rusting |
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| US4713158A (en) * | 1985-07-23 | 1987-12-15 | Service National: Gaz De France | System for applied current cathodic protection of a structure |
| US20060070871A1 (en) * | 2004-10-04 | 2006-04-06 | Bushman James B | Cathodic protection system for underground storage tank |
| CN1861845A (en) * | 2006-05-30 | 2006-11-15 | 过梦飞 | Steel storage tank group and buried-pipe net area cathode protecting process |
| CN203320127U (en) * | 2013-06-08 | 2013-12-04 | 中国石油天然气集团公司 | Buried pipeline cathode protection system of long-distance pipeline process station |
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| CN209292485U (en) * | 2018-12-10 | 2019-08-23 | 美钻深海能源科技研发（上海）有限公司 | A kind of adjustable cathodic protection by rectifier system |
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2018
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4713158A (en) * | 1985-07-23 | 1987-12-15 | Service National: Gaz De France | System for applied current cathodic protection of a structure |
| US20060070871A1 (en) * | 2004-10-04 | 2006-04-06 | Bushman James B | Cathodic protection system for underground storage tank |
| CN1861845A (en) * | 2006-05-30 | 2006-11-15 | 过梦飞 | Steel storage tank group and buried-pipe net area cathode protecting process |
| CN203320127U (en) * | 2013-06-08 | 2013-12-04 | 中国石油天然气集团公司 | Buried pipeline cathode protection system of long-distance pipeline process station |
| CN203625477U (en) * | 2013-11-22 | 2014-06-04 | 中国石油天然气股份有限公司 | Cathode protection monitoring devices |
| CN108411308A (en) * | 2018-03-30 | 2018-08-17 | 东北电力大学 | Novel buried pipeline cathod protector and method |
| CN209292485U (en) * | 2018-12-10 | 2019-08-23 | 美钻深海能源科技研发（上海）有限公司 | A kind of adjustable cathodic protection by rectifier system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575716A (en) * | 2020-05-09 | 2020-08-25 | 中核武汉核电运行技术股份有限公司 | Nuclear power plant buried pipeline cathodic protection effectiveness monitoring system |
| CN114216842A (en) * | 2021-12-24 | 2022-03-22 | 华中科技大学 | Online monitoring device and method for electrifying efficiency of reinforced concrete during accelerated rusting |
| CN114216842B (en) * | 2021-12-24 | 2024-06-04 | 华中科技大学 | On-line monitoring device and method for electrifying efficiency during reinforced concrete accelerated corrosion |
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