CN106153528A - A kind of metal covering Corrosion monitoring instrument and measuring method thereof - Google Patents
A kind of metal covering Corrosion monitoring instrument and measuring method thereof Download PDFInfo
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- CN106153528A CN106153528A CN201610780686.XA CN201610780686A CN106153528A CN 106153528 A CN106153528 A CN 106153528A CN 201610780686 A CN201610780686 A CN 201610780686A CN 106153528 A CN106153528 A CN 106153528A
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- metal
- harvester
- detection region
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- thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
Abstract
The present invention relates to a kind of metal covering Corrosion monitoring instrument and measuring method thereof, probe groups is connected with harvester by connecting wire and adapter, and harvester carries out communication with host computer and is connected；Probe groups is made up of multiple probes being distributed in concentric circular or being distributed in parallel lines, and probe is bipolar coupled electrode；Method includes: the starting stage, and the voltage U of metal unit detection region i measured by harvesteri0, electric current Ii0And temperature T0；And record current thickness Hi0；Normal measuring phases, the voltage U of metal unit detection region i measured by harvesteri1, electric current Ii1, temperature T1；Calculated thickness, Hi1=Hi0×Gi1/Gi0；Seeking corrosion rate, host computer obtains corrosion of metal speed according to the pipe thickness change in above-mentioned metal unit detection region.Measurement error of the present invention is little, and highly sensitive, capacity of resisting disturbance is strong, and work efficiency is high, it is to avoid the impact of the anthropic factor that manual operation is brought, it is possible to realize remote online and measure.
Description
Technical field
The present invention relates to a kind of Novel lossless detection device, specifically a kind of metal covering Corrosion monitoring instrument and measurement thereof
Method.
Background technology
Recent year petroleum chemical enterprise refines high-sulfur, high-acid crude oil in a large number, makes equipment corrosion aggravate, and the problem brought is also
Further serious, in order to Accident prevention occurs, need to strengthen equipment corrosion monitoring, especially the large area of equipment wall thickness is detected in real time
Current enterprise in the urgent need to.Detection to equipment wall thickness at present mainly uses ultrasound examination, and ultrasonic thickness measurement needs
Want couplant, be to measure some wall thickness during detection, not only measure time length, inefficiency, and monitoring range is little, measurement error
Greatly, sensitivity is the highest.
Summary of the invention
There is measurement time length, inefficiency for ultrasound examination to equipment wall thickness in prior art, measure by mistake
Difference is big waits deficiency, the technical problem to be solved in the present invention be to provide a kind of highly sensitive, area of detection big, the probe of life-span length in
Concentric circular distribution or in parallel lines distribution metal covering Corrosion monitoring instrument and measuring method.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
One metal covering Corrosion monitoring instrument of the present invention, probe groups and harvester, it is characterised in that: probe groups is led by connection
Line and adapter are connected with harvester, and harvester carries out communication with host computer and is connected；Probe groups by multiple in concentric circular distribution or
In parallel lines, the probe of distribution is constituted, and probe is the bipolar coupled electrode of the wall thickness for testing metal.
Being provided with testing circuit in harvester, testing circuit includes that multiple metal unit detects the amplifying unit in region, electric current
Monitoring resistor RI, constant-current source exciting circuit, A/D converter and central controller；Metal unit is detected region by amplifying unit
Resistance R1Sampled signal be amplified after through A/D converter send into central controller, central controller by communication unit with
Host computer carries out communication connection；Constant-current source exciting circuit provides excitation power supply for metal unit detection region.
The resistance R in metal unit detection region1Swashed with constant-current source by gating switch after connecting with current monitoring resistance RI
Encourage circuit to be connected.
One metal covering Corrosion monitoring instrument measurement method of the present invention, comprises the following steps:
Starting stage: the voltage U of metal unit detection region i measured by harvesteri0, electric current Ii0And temperature T0；And record
Current thickness Hi0；
Normal measuring phases: the voltage U of metal unit detection region i measured by harvesteri1, electric current Ii1, temperature T1。
Calculated thickness:
Hi1=Hi0×Gi1/Gi0 (1)
Wherein Gi0=Ii0/Ui0；Gi1=Ii1/Ui1；Gi0The conductance during primary detection of region i, H is detected for metal uniti0
Pipe thickness when detecting the primary detection of region i for metal unit, Gi1Electricity when normally detecting for metal unit detection region i
Lead, Hi1Pipe thickness when normally detecting for metal unit detection region i；
Seek corrosion rate: host computer obtains corrosion of metal according to the pipe thickness change in above-mentioned metal unit detection region
Speed.
Described harvester has probe groups, and it is made up of multiple probes being distributed in concentric circular or being distributed in parallel lines, visits
Pin is bipolar coupled electrode, and an electrode is used for applying excitation, and an electrode is used for sampling.
Forming a monitored area in probe groups between every two probes, whole probes are formed multiple on tested metal covering
Metal unit detection region；Each metal unit detection region uses same current loop detection electric current.
Thickness equations derivation is as follows:
Resistance material computing formula R=ρ × L/S is 1.
Wherein, ρ is metallic resistance rate, and L is metal length, and S is that cross section metal amasss；
At starting stage R0=ρ0×L0/S0 ②
Wherein, ρ0For starting stage metallic resistance rate, L0For starting stage metal length, S0For starting stage cross section metal
Long-pending；
Normal measuring phases R1=ρ1×L1/S1 ③
Wherein, ρ1For normal measuring phases metallic resistance rate, L1For normal measuring phases metal length, S1Measure for normal
Stage cross section metal amasss；
As follows to each Parameters variation of normal measuring phases from the starting stage:
Metallic resistance rate is constant, i.e. ρ0=ρ1 ④
Metal length L is constant, i.e. L0=L1 ⑤
6. cross section metal amasss S=width W × thickness H
Width W is that electrode diameter is constant, i.e. W0=W1 ⑦
Thickness H changes due to corrosion；
By formula 2., 6. can obtain: R0=ρ0×L0/(W0×H0) ⑧
By formula 3., 4., 5., 6., 7. can obtain: R1=ρ0×L0/(W0×H1) ⑨
Formula 8./9. formula obtain: H1=H0×R0/R1 ⑩
Resistance electrical measurement formula
Wherein, U is metallic conductor terminal voltage, and I is for flowing through electric current；
Conductance electrical measurement formula
Wherein, U is metallic conductor terminal voltage, and I is for flowing through electric current；
By formula 10.,Can obtain: H1=H0×G1/G0。
The invention have the advantages that and advantage:
1. measurement error is little.During testing circuit of the present invention detection metal unit region, survey metal temperature simultaneously, carry out temperature
Compensate, therefore effectively reduce measurement error.
The most highly sensitive, capacity of resisting disturbance is strong, and work efficiency is high.The present invention with constant-current source as pumping signal, Ke Yitong
Cross frequency range filtering and extract useful signal suppress noise signal, the employing amplifier simultaneously sampled of multichannel, improve sensitivity, by
This shortens the measurement time, improve work efficiency, it is to avoid the impact of the anthropic factor that manual operation is brought.
The most applied widely.The present invention is the non-contact technology that zonal corrosion situation specified by monitoring pipeline, applies also for
On storage tank or other metal building things；Can be used in the solid (elbow, T-joint, Y-joint etc.) of detection of complex.
4. realize remote online to measure.Apparatus of the present invention carry out communication with host computer and are connected, it is achieved measurement result
Telecommunication, is processed and shows measurement result and corrosion curve by host computer, can be with real time on-line monitoring corrosion of metal
Situation.
5. present invention can apply to, on storage tank or other metal building things, there is the highest sensitivity and degree of accuracy, can
Detect the change of corrosion thinning in early days, thus preventive measure can be optimized before corrosion-damaged generation；Can be used for high temperature work
Condition, and there is no temperature drift and reduce the problem of precision, there is measurement error little, highly sensitive, capacity of resisting disturbance is strong, is suitable for model
Enclose the advantages such as wide, it is possible to realize remote online and measure.
Accompanying drawing explanation
Fig. 1 be probe of the present invention be concentric circular distribution (as a example by 6 unit monitored areas) schematic diagram；
Fig. 2 be probe of the present invention be parallel lines distribution (as a example by 6 unit monitored areas) schematic diagram；
Fig. 3 is harvester external structure schematic diagram of the present invention；
Fig. 4 is measuring circuit schematic diagram of the present invention.
Wherein, 1 is housing, and 2 is connecting line input interface, and 3 is excitation interface, and 4 is temperature sensor interface, and 5 is power supply
Interface, 6 is communication interface.
Detailed description of the invention
Below in conjunction with Figure of description, the present invention is further elaborated.
As shown in Figure 1, 2, one metal covering Corrosion monitoring instrument of the present invention, probe groups and harvester, probe groups is by connecting
Wire and adapter are connected with harvester, and harvester carries out communication with host computer and is connected；Probe groups is distributed in concentric circular by multiple
Or the probe of distribution is constituted in parallel lines, probe is the bipolar coupled electrode of the wall thickness for testing metal.
As shown in Figure 4, in harvester, it is provided with testing circuit, including multiple metal unit detection region amplifying unit, electric current
Monitoring resistor RI, constant-current source exciting circuit, A/D converter and central controller, metal unit is detected region by amplifying unit
Resistance R1After being amplified, sending into central controller through A/D converter, central controller is by communication unit and upper calculating
Machine carries out communication connection；Constant-current source exciting circuit provides excitation power supply for metal unit detection region.
The resistance R in metal unit detection region1By gating switch SWV after connecting with current monitoring resistance RI1、SWI1With
Constant-current source exciting circuit is connected.
Metal covering Corrosion monitoring instrument of the present invention, including probe groups, connecting line and harvester three part, probe groups: in one heart
Probe P0, P1, P2, P3, P4, P5, P6 of circle distribution, as shown in Figure 1；Or in parallel lines distribution probe P1, P2, P3, P4,
P5、P6；P-1, P-2, P-3, P-4, P-5, P-6, as shown in Figure 2；Probe is bipolar coupled electrode, of bipolar coupled electrode
Electrode is used for applying excitation, and an electrode is used for sampling；Connecting line is the wire for connecting probe and harvester.Such as Fig. 3 institute
Showing, harvester includes: housing 1, and there is connecting line input interface 2 in housing 1 front, encourages interface 3, temperature sensor interface 4；Housing
1 is backed with power interface 5 and communication interface 6, and communication interface 6 carries out communication with host computer and is connected.
As shown in Figure 4, only provide two electrical schematic diagrams measuring loop, the present embodiment use six measure loop,
Electric connecting mode is similar to Fig. 4.Testing circuit includes the resistance R in metal unit detection region1With current monitoring resistance RI, two
By gating switch SWV after person's series connection1、SWI1(it is connected with constant-current source exciting circuit；Resistance R1A/D is sent into through unit amplifying circuit
Transducer；RI sends into A/D converter through accurate amplifier UI；A/D converter is connected with central controller；Central controller is by logical
News unit carries out communication with host computer and is connected.
The work process of metal covering Corrosion monitoring instrument of the present invention is as follows:
Metal covering its measuring method of Corrosion monitoring instrument is based on measuring metal erosion loss, by measuring the corruption of metal
Depletion of deteriorating is thin and draws the change of rate of metal corrosion.Metal unit detection zone resistance R1 increases along with metal erosion loss
Greatly, its time dependent function curve i.e. can get metal loss amount function curve in time, namely corrosion rate；Separately
On the one hand, metal unit detection zone resistance R1 variation with temperature can increase or reduce, in order to eliminate due to temperature variation band
The measurement error come, eliminates the temperature impact on measurement result by temperature-compensating.In testing circuit, the 1st amplifier UV1 adopts
With high input impedance, high-precision meter amplifier, its input receives metal unit detection region R1, and the 1st amplifier UV1's is defeated
Going out signal after the 2nd amplifier UVV1 amplifies further, output signal enters A/D converter and carries out analog digital conversion, centre
The digital signal that A/D converter is exported by reason device is acquired, and calculates accordingly, and central processing unit passes through communication list simultaneously
Unit carries out communication with host computer and is connected, host computer detection data are carried out calculating process, and show measurement result
With and corrosion curve, by the on-line measurement of Display Realization detecting system.
One metal covering Corrosion monitoring instrument measurement method of the present invention, comprises the following steps:
Starting stage: the voltage U of metal unit detection region i measured by harvesteri0, electric current Ii0And temperature T0；And record
Current thickness Hi0；
Normal measuring phases: the voltage U of metal unit detection region i measured by harvesteri1, electric current Ii1, temperature T1。
Calculated thickness:
Hi1=Hi0×Gi1/Gi0Calculate；Wherein Gi0=Ii0/Ui0；Gi1=Ii1/Ui1 (1)
Wherein, Gi0The conductance during primary detection of region i, H is detected for metal uniti0For metal unit detection region i's
Pipe thickness during primary detection, Gi1For conductance when normally detecting of metal unit detection region i, Hi1Detect for metal unit
Pipe thickness when region i normally detects；
Seek corrosion rate: host computer, according to the pipe thickness change in above-mentioned metal unit detection region, obtains the corruption of metal
Erosion speed.
Described harvester has probe groups, and it is made up of multiple probes being distributed in concentric circular or being distributed in parallel lines, visits
Pin is bipolar coupled electrode, and an electrode is used for applying excitation, and an electrode is used for sampling.
Forming a metal unit detection region in probe groups between every two probes, whole probes are on tested metal covering
Form multiple metal unit detection region；Each metal unit detection region uses same current loop detection electric current.
The derivation of above-mentioned computing formula (1) is as follows:
Resistance material computing formula R=ρ × L/S is 1.
Wherein, ρ is metallic resistance rate, and L is metal length, and S is that cross section metal amasss.
In the present invention, starting stage R0=ρ0×L0/S0 ②
Wherein, ρ0For starting stage metallic resistance rate, L0For starting stage metal length, S0For starting stage cross section metal
Long-pending
Normal measuring phases R1=ρ1×L1/S1 ③
Wherein, ρ1For normal measuring phases metallic resistance rate, L1For normal measuring phases metal length, S1Measure for normal
Stage cross section metal amasss.
Owing to two-phase measuring is different time, so parameter can change as follows:
Metal ρ metallic resistance rate is constant, draws ρ0=ρ1 ④
Metal length L constant (expanding with heat and contract with cold the least, negligible), draws L0=L1 ⑤
6. cross section metal amasss S=width W × thickness H
Width W is that electrode diameter is constant, draws W0=W1 ⑦
Thickness H can corrode change.
By formula 2., 6. can obtain: R0=ρ0×L0/(W0×H0) ⑧
By formula 3., 4., 5., 6., 7. can obtain: R1=ρ0×L0/(W0×H1) ⑨
Formula 8./9. formula obtain: H1=H0×R0/R1 ⑩
Resistance electrical measurement formula
Wherein, U is metallic conductor terminal voltage, and I is for flowing through electric current.
Conductance electrical measurement formula
Wherein, U is metallic conductor terminal voltage, and I is for flowing through electric current.
By formula 10.,Can obtain: H1=H0×G1/G0
Wherein, Gi0For the conductance (when not being corroded) during the primary detection of tested metal unit region i, Hi0For tested gold
Belong to the original pipe wall thickness (when not being corroded) of unit area i, Gi1Electricity when normally detecting for tested metal unit region i
Lead, Hi1For the tested metal unit region current pipe thickness of i.
In actual measurement, I0、U0、I1、U1Bring formula into (1).Compared to H1=H0×(I1/U1)/(I0/U0) formula is (1)
H1=H0×G1/G0It is more readily understood memory.
Metal covering Corrosion monitoring instrument of the present invention and measuring method thereof, be mainly used to detect various forms of corrosion, it is possible to inspection
Survey most crackle and monitoring corrosion and the extension of crackle.Its principle is to be arranged to divide in concentric circular in district to be measured by probe
Cloth or in parallel lines, applies same pumping signal to electrode；Then the minor variations by metal structure electric field is measured, with recording
Electric conductivity value with initial setting time the electric conductivity value that records compare, detect according to this metal loss owing to corrosion etc. causes,
Crackle, pit or groove.Present invention can apply on storage tank or other metal building things.The present invention have the highest sensitivity and
Degree of accuracy, can detect the change of corrosion thinning in early days, thus can optimize preventive measure before corrosion-damaged generation.This
The bright worst hot case that can be used for, and there is no temperature drift and reduce the problem of precision, there is measurement error little, highly sensitive, anti-dry
The advantages such as ability of disturbing is strong, applied widely, it is possible to realize remote online and measure.
Claims (7)
1. a metal covering Corrosion monitoring instrument, including: probe groups and harvester, it is characterised in that: probe groups is by connecting wire
And adapter is connected with harvester, harvester carries out communication with host computer and is connected；Probe groups by multiple in concentric circular distribution or in
The probe of parallel lines distribution is constituted, and probe is the bipolar coupled electrode of the wall thickness for testing metal.
2. the metal covering Corrosion monitoring instrument as described in claim 1, it is characterised in that: it is provided with testing circuit in harvester, detection
Circuit includes multiple metal unit detection amplifying unit in region, current monitoring resistance RI, constant-current source exciting circuit, A/D conversion
Device and central controller；The amplifying unit resistance R to metal unit detection region1Sampled signal turns through A/D after being amplified
Parallel operation sends into central controller, and central controller carries out communication by communication unit with host computer and is connected；Constant-current source encourages
Circuit provides excitation power supply for metal unit detection region.
3. the metal covering Corrosion monitoring instrument as described in claim 2, it is characterised in that: the resistance R in metal unit detection region1With
It is connected with constant-current source exciting circuit by gating switch after current monitoring resistance RI series connection.
4. a metal covering Corrosion monitoring instrument measurement method, it is characterised in that comprise the following steps:
Starting stage: the voltage U of metal unit detection region i measured by harvesteri0, electric current Ii0And temperature T0；And record current
Thickness Hi0；
Normal measuring phases: the voltage U of metal unit detection region i measured by harvesteri1, electric current Ii1, temperature T1。
Calculated thickness:
Hi1=Hi0×Gi1/Gi0 (1)
Wherein Gi0=Ii0/Ui0；Gi1=Ii1/Ui1；Gi0The conductance during primary detection of region i, H is detected for metal uniti0For gold
Pipe thickness when belonging to the primary detection of unit detection region i, Gi1Conductance during the normal detection of region i is detected for metal unit,
Hi1Pipe thickness when normally detecting for metal unit detection region i；
Seek corrosion rate: host computer obtains corrosion of metal speed according to the pipe thickness change in above-mentioned metal unit detection region
Rate.
5. the metal covering Corrosion monitoring instrument measurement method as described in claim 4, it is characterised in that:
Described harvester has probe groups, and it is made up of multiple probes being distributed in concentric circular or being distributed in parallel lines, and probe is equal
For bipolar coupled electrode, an electrode is used for applying excitation, and an electrode is used for sampling.
6. the metal covering Corrosion monitoring instrument measurement method as described in claim 5, it is characterised in that:
Forming a monitored area in probe groups between every two probes, whole probes form multiple metal on tested metal covering
Unit detection region；Each metal unit detection region uses same current loop detection electric current.
7. the metal covering Corrosion monitoring instrument measurement method as described in claim 4, it is characterised in that thickness equations was derived
Journey is as follows:
Resistance material computing formula R=ρ × L/S is 1.
Wherein, ρ is metallic resistance rate, and L is metal length, and S is that cross section metal amasss；
At starting stage R0=ρ0×L0/S0 ②
Wherein, ρ0For starting stage metallic resistance rate, L0For starting stage metal length, S0Amass for starting stage cross section metal；
Normal measuring phases R1=ρ1×L1/S1 ③
Wherein, ρ1For normal measuring phases metallic resistance rate, L1For normal measuring phases metal length, S1For normal measuring phases
Cross section metal amasss；
As follows to each Parameters variation of normal measuring phases from the starting stage:
Metallic resistance rate is constant, i.e. ρ0=ρ1 ④
Metal length L is constant, i.e. L0=L1 ⑤
6. cross section metal amasss S=width W × thickness H
Width W is that electrode diameter is constant, i.e. W0=W1 ⑦
Thickness H changes due to corrosion；
By formula 2., 6. can obtain: R0=ρ0×L0/(W0×H0) ⑧
By formula 3., 4., 5., 6., 7. can obtain: R1=ρ0×L0/(W0×H1) ⑨
Formula 8./9. formula obtain: H1=H0×R0/R1 ⑩
Resistance electrical measurement formula R=U/I
Wherein, U is metallic conductor terminal voltage, and I is for flowing through electric current；
Conductance electrical measurement formula G=I/U
Wherein, U is metallic conductor terminal voltage, and I is for flowing through electric current；
By formula 10.,Can obtain: H1=H0×G1/G0。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110821472A (en) * | 2019-11-15 | 2020-02-21 | 中国石油集团测井有限公司华北分公司 | Casing pipe state evaluation method |
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| CN110821472A (en) * | 2019-11-15 | 2020-02-21 | 中国石油集团测井有限公司华北分公司 | Casing pipe state evaluation method |
| CN110821472B (en) * | 2019-11-15 | 2021-06-08 | 中国石油天然气集团有限公司 | Casing pipe state evaluation method |
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Application publication date: 20161123 |