CN201897564U - Metallic corrosion rate detection device - Google Patents
Metallic corrosion rate detection device Download PDFInfo
- Publication number
- CN201897564U CN201897564U CN2010206428138U CN201020642813U CN201897564U CN 201897564 U CN201897564 U CN 201897564U CN 2010206428138 U CN2010206428138 U CN 2010206428138U CN 201020642813 U CN201020642813 U CN 201020642813U CN 201897564 U CN201897564 U CN 201897564U
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- probe
- adapter
- unit
- power supply
- corrosion
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Abstract
The utility model relates to a metallic corrosion rate detection device. The metallic corrosion rate detection device is characterized by comprising a monitoring probe, a probe adapter, a power adapter and a data collector, wherein the monitoring probe is connected with a probe interface of the data collector through the probe adapter, one terminal of the power adapter is connected with a power communication interface of the data collector, and the other terminal of the power adapter is connected with a monitoring system bus. The metallic corrosion rate detection device is a measuring device with high sensitivity and quick response; and compared with other measuring devices, the metallic corrosion rate detection device has higher sensitivity and longer service life and is safer to use, so that the working efficiency is improved, the influence of human factors due to the manual operation and the potential safety hazard caused by frequently replacing the probe are avoided, and the measurement is accurate and reliable.
Description
Technical field
The utility model relates to a kind of rate of metal corrosion detection technique, a kind of specifically rate of metal corrosion pick-up unit.
Background technology
Domestic in recent years chemical enterprise is refined high-sulfur, high-acid crude oil in a large number, make the equipment corrosion aggravation, the problem of being brought is also serious further, and corrosion is constantly bringing economic loss to enterprise and threatening people's life, and the generation of corrosion proposes higher requirement to corroding real-time detection.Petrochemical complex corrosion can be divided into cold end corrosion and high temperature corrosion, and cold end corrosion mainly contains the galvanic corrosion of the water of galvanic corrosion, crude oil medium of industrial colling and sulfuretted hydrogen, hydrochloric acid etc., and high temperature corrosion mainly contains the corrosion of sulfide pyrochemistry.It is electrochemistry linear polarization and low-temperature resistance probe measurement technology that the low-temperature section corrosion detects method commonly used, and the corrosion of high temperature position detects adopts the high temperature resistance probe technique.Electrochemical measurement adopts the linear polarization measuring method, and what its measurement result reflected is the instantaneous corrosion of medium to metal, only has been applicable to electrolytical ambient condition, therefore use to be restricted, and measurement result is subjected to the influence of system can produce maximum 200% error.The resistance probe measuring method is the method based on metal loss, what its measurement result reflected is the uniform corrosion of medium to metal, and can in all media, use, resistance probe is divided into filament and tubular structure, the sensitivity of filament probe measurement is too low, thereby can't measure the numerical value of low corrosion rate at short notice, filiform corrosion test specimen sectional area is little simultaneously, intensity is low, life-span is short, because the defective of local corrosion and temperature compensation also can produce bigger error to measurement result.Tubular structure probe measurement highly sensitive, but, need frequently to change because the probe corrosion coupon is thinner, and it is less to bear pressure, and service time is shorter, thereby under high temperature and high pressure environment, use and be restricted.The inductance probe measuring method is a corrosion monitoring technology newly developed recent years, though its method is very unique, but practical application at present is rarer, subject matter is that sinusoidal signal and cosine signal requirement could realize measuring accurate requirement fully synchronously, hardware circuit is realized difficult fully synchronously, and simultaneously, the inductive coil temperature influence inductance value of inductance probe inside is with temperature drift, in the unusual rigorous environment measurement result instability of industry spot, technical progress is slow.
The utility model content
At above shortcomings part in the prior art, the technical problems to be solved in the utility model provide a kind of highly sensitive, intensity is big, the life-span is long, be applicable to the rate of metal corrosion pick-up unit of various ambient conditions and process conditions.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
The utility model rate of metal corrosion pick-up unit, it is characterized in that comprising: monitoring probe, probe adapter, power supply adaptor and data acquisition unit, wherein monitoring probe links to each other with the probe interface of data acquisition unit by probe adapter, power supply adaptor one end connects the power supply communication interface of data acquisition unit, and other end monitoring system bus links to each other.
Described data acquisition unit has the 1st, 2 instrument amplifiers, the 1st, 2 operational amplifiers, the 1st, 2 signal modulators, A/D converter, control system feedback channel and microprocessor, wherein the 1st, the differential input end of 2 instrument amplifiers is connected to monitoring probe by digital selector switch through probe adapter respectively, the 1st, the output terminal of 2 instrument amplifiers is respectively with the 1st, the positive input terminal of 2 operational amplifiers links to each other, the 1st, 2 operational amplifier output terminals are respectively by the 1st, 2 signal modulators are connected to the data input pin of microprocessor through A/D converter, and microprocessor links to each other with monitoring system bus through power supply adaptor by communication unit; The control output end of microprocessor imposes on monitoring probe through control system feedback channel A7 with control signal.
The corrosion coupon inside of described monitoring probe is provided with temperature sensor; Described probe adapter comprises the hollow adapter bar, and adapter bar two ends are arranged with probe socket receptacle, and the adapter bar is provided with the nut of two activities; Described power supply adaptor comprises the hollow adapter bar, and adapter bar one end is provided with probe socket receptacle, and the other end is provided with external thread and draws lead, and the adapter bar is provided with the nut of an activity; Described data acquisition unit is installed in the shell, and outer casing bottom is provided with base frame, arranges probe interface and power supply communication interface on the base frame; Described probe interface and power supply communication interface adopt hermetically-sealed construction to be symmetrical arranged; Described probe interface and power supply communication interface adopt the eccentric setting of hermetically-sealed construction; Also be provided with jackscrew on the described base frame.
The utlity model has following beneficial effect and advantage:
1. the utility model is the quick response measuring device of a kind of high sensitivity, compare with other measurement mechanism and to have higher sensitivity, service time is longer, safer, improved work efficiency thus, the potential safety hazard of having avoided artificial factor that manually-operated brought and frequent replacing probe to bring is measured accurately and reliably.
2. the utility model monitoring probe is measured the inner temperature sensor of installing of test piece, the time actual measured amount monitoring position temperature, the influence of temperature factor to corrosion is provided.
3. the utility model monitoring probe is connected by probe adapter with data acquisition unit, and rig-site utilization is easy.
Description of drawings
Fig. 1 is a data acquisition unit electrical schematic diagram in the utility model;
Fig. 2 A is a data acquisition unit shell mechanism synoptic diagram;
Fig. 2 B is the base frame structural representation of data acquisition unit;
Fig. 3 A is that data acquisition unit shell another kind patches the form structural representation;
Fig. 3 B is the base frame structural representation among Fig. 3 A;
Fig. 4 is the utility model middle probe adapter structure synoptic diagram;
Fig. 5 is a power supply communications adapter structural representation in the utility model;
Fig. 6 is a corrosion monitoring probe structure synoptic diagram in the utility model;
Fig. 7 is corrosion coupon thickness digital curve figure in the utility model;
Fig. 8 is the corrosion on-line monitoring system data and curves figure of the utility model application example.
Embodiment
The utility model is that a kind of rate of metal corrosion pick-up unit comprises: monitoring probe, probe adapter, power supply adaptor and data acquisition unit, wherein monitoring probe links to each other with the probe interface of data acquisition unit by probe adapter, power supply adaptor one end connects the power supply communication interface of data acquisition unit, and other end monitoring system bus links to each other.
As shown in Figure 1, described data acquisition unit has the 1st, 2 instrument amplifier A1, A2, the 1st, 2 operational amplifier A 3, A4, the 1st, 2 signal modulator A6, A5, A/D converter, control system feedback channel A7 and microprocessor, wherein the 1st, 2 instrument amplifier A1, the differential input end of A2 is connected to monitoring probe by digital selector switch through probe adapter respectively, the 1st, 2 instrument amplifier A1, the output terminal of A2 is respectively with the 1st, 2 operational amplifier A 3, the positive input terminal of A4 links to each other, the 1st, 2 operational amplifier A 3, the A4 output terminal is respectively by the 1st, 2 signal modulator A6, A5 is connected to the data input pin of microprocessor through A/D converter, and microprocessor links to each other with monitoring system bus through power supply adaptor by communication unit; The control output end of microprocessor imposes on monitoring probe through control system feedback channel A7 with control signal;
The utility model is to measure the metal erosion loss, to measure the measurement of the resistance variations realization corrosion speed of corrosion coupon by current induction method.
The resistance of corrosion coupon increases along with the metal erosion loss, and the time dependent function curve of resistance can obtain metal loss amount function curve in time, just corrosion rate.The resistance of corrosion coupon can increase or reduce with variation of temperature on the other hand, in order to eliminate the measuring error of bringing owing to temperature variation, measure with corrosion coupon by temperature-compensation circuit and eliminate the influence of temperature measurement result in the compensation test piece of same temperature conditions.
R wherein
FBe corrosion coupon, R
BFor compensation test piece, A1-A6 are the control survey passage, A7 is the control system feedback channel.
R
FAlong with corrosion of metal resistance increases, while R
F, R
BResistance increases with variation of temperature or reduces.By to R
F, R
BPath applies alternating voltage pumping signal, measure R
F, R
BThe induced voltage of end, corresponding U
F, U
B, calculate R
F, R
BVariation:
U
F＝R
F×I
H
U
B＝R
B×I
H
Wherein: I
HFor flowing through the electric current of corrosion coupon and compensation test piece.
Make U by feedback control loop
BAmplifying back B point voltage is 1 volt of steady state value, and this voltage is as the benchmark of A/D converter.
Have again: R
F=ρ * L
F÷ S
F
R
B＝ρ×L
B÷S
B
Wherein: ρ is the metallic resistance rate, changes with temperature;
L
F, L
BLength for corrosion coupon and compensation test piece is constant
S
F, S
BBe the area of corrosion coupon and compensation test piece, S
FAlong with corrosion of metal reduced thickness, area reduce, S
BBe constant
Because S
F=H
F* W
F
②
Wherein: H
FBe corrosion coupon thickness, W
FIt is the corrosion coupon width.
By formula 1., 2. can get:
By formula 3. as seen, just can obtain the attenuate amount of test piece by the induced response signal of measuring test piece, thereby draw corrosion of metal speed.
The aanalogvoltage of test piece induction is through digitizing A/D conversion, corrosion coupon thickness H
FObtaining corrosion losses after the digitizing is:
H
FS＝(262144×0.5)/H
F-262144
Corrosion losses in unit interval are corrosion speed.
As shown in Figure 6, the corrosion coupon inside of monitoring probe is provided with temperature sensor;
The corrosion monitoring probe mainly emits 16 by protection; compensation test piece 17; corrosion coupon 18; temperature sensor 24; probe rod 20; inner lead 19; inner stuffing 21; excessively manage 22; nine parts such as probe socket receptacle 23 grades constitute; wherein measuring sensor corrosion coupon 18 is thickness 0.75mm; diameter 9mm; the tubular structure of effective length 110mm; compensation test piece 17 and corrosion coupon material of the same race; be thickness 0.5mm; diameter 5mm; the tubular structure of effective length 60mm; in parallel in corrosion coupon inside; front end adopts the argon arc welding welding; in corrosion coupon inside temperature sensor 24 is housed; corrosion coupon and probe rod 20 adopt the argon arc welding welding; the probe rod 20 that inner lead 19 passes hollow is connected with probe socket receptacle 23, and probe rod 20 inside have filler 21 to fill.Probe rod 20 is by transition conduit 22 and probe socket receptacle 23 welding.
As shown in Figure 4, probe adapter comprises the hollow adapter bar, and adapter bar two ends are arranged with probe socket receptacle, and the adapter bar is provided with the nut of two activities;
The probe socket receptacle of one end linking probe of monitoring probe adapter, the other end connects the probe interface of collector.Adapter two-end structure symmetry, adaptor interface are the nose ends 6 of one six pin connector, are fixed on the adapter end, and the hexagonal nut 7 of two activities is arranged on the adapter bar 8, are used to lock probe and collector.The 6 piece leads 9 of the connector at the two ends on the probe adapter by passing the adapter bar connect, and the order of connection is that the nose end with adapter locating slot correspondence is a benchmark, and clockwise direction is corresponding one by one.
As shown in Figure 5, described power supply adaptor comprises hollow adapter bar 12, and adapter bar one end is provided with probe socket receptacle, and the other end is provided with external thread and draws lead, and the adapter bar is provided with the nut of an activity.
One end of power supply communications adapter is connected with the power supply communication interface of collector, the power supply and the communication bus of other end joint detection system.Power supply communications adapter one end interface is the nose end 10 of one six pin connector, is fixed on the adapter end, and the hexagonal nut 11 of an activity is arranged on the adapter bar, is used to lock collector.The other end has external thread 15.4 core leads, 13,14 connection connectors pass the adapter bar and draw.
Shown in Fig. 2 A 2B 3A 3B, described collector shell comprises housing and base frame, comprises the probe interface and the power supply communication interface of two sealings on the base frame.
The collector housing is by the requirement of explosion proof design.Cap 1 is an aluminium alloy castings, and base frame 2 is a stainless steel, and cap is threaded with base frame, between cap and base frame O-ring seal is arranged.Base frame has a jackscrew 5, and probe interface 3 and power supply communication interface 4 are air locking.
As shown in Figure 8, the utility model rig-site utilization example.
Be that certain petrochemical plant first cover distilling apparatus subtracts to take one's place before the heat A and subtract and takes one's place the corrosion data curve that heat back B utilizes this metal corrosion rate pick-up unit to record from April 30,2 days to 2010 April in 2010.Press manufacturing technique requirent, subtract and take one's place before the heat behind the A control of B pipeline corrosion less than 0.35mm/.From test curve as seen, during subtract and take one's place heat back B corrosion losses 25111nm, rate of corrosion is 0.336mm/, subtracts to take one's place A corrosion losses 1769nm before the heat, rate of corrosion is 0.028mm/, measurement result shows that this position corrosion control is stable, reaches manufacturing technique requirent.Can show simultaneously that the position that the position is higher with respect to temperature, gas phase media content the is more corrosion lower in temperature, that liquid phase medium content is more will be more hurry up.
According to test result as seen, the resolution of data acquisition unit can reach 1nm, when rate of corrosion is 0.028mm/, master slave system just can be made clear response in 30 minutes, conventional, electric-resistance probe resolution is 0.1um (micron), approximately needed 3 days just can make response under the same rate of corrosion situation, show that this metal corrosion rate pick-up unit has higher sensitivity and quicker response.
Claims (9)
1. rate of metal corrosion pick-up unit, it is characterized in that comprising: monitoring probe, probe adapter, power supply adaptor and data acquisition unit, wherein monitoring probe links to each other with the probe interface of data acquisition unit by probe adapter, power supply adaptor one end connects the power supply communication interface of data acquisition unit, and other end monitoring system bus links to each other.
2. by the described rate of metal corrosion pick-up unit of claim 1, it is characterized in that: described data acquisition unit has the 1st, 2 instrument amplifiers, the 1st, 2 operational amplifiers, the 1st, 2 signal modulators, A/D converter, control system feedback channel and microprocessor, wherein the 1st, the differential input end of 2 instrument amplifiers is connected to monitoring probe by digital selector switch through probe adapter respectively, the 1st, the output terminal of 2 instrument amplifiers is respectively with the 1st, the positive input terminal of 2 operational amplifiers links to each other, the 1st, 2 operational amplifier output terminals are respectively by the 1st, 2 signal modulators are connected to the data input pin of microprocessor through A/D converter, and microprocessor links to each other with monitoring system bus through power supply adaptor by communication unit; The control output end of microprocessor imposes on monitoring probe through control system feedback channel A7 with control signal.
3. by the described rate of metal corrosion pick-up unit of claim 1, it is characterized in that: the corrosion coupon inside of described monitoring probe is provided with temperature sensor.
4. by the described rate of metal corrosion pick-up unit of claim 1, it is characterized in that: described probe adapter comprises the hollow adapter bar, and adapter bar two ends are arranged with probe socket receptacle, and the adapter bar is provided with the nut of two activities.
5. by the described rate of metal corrosion pick-up unit of claim 1, it is characterized in that: described power supply adaptor comprises the hollow adapter bar, adapter bar one end is provided with probe socket receptacle, and the other end is provided with external thread and draws lead, and the adapter bar is provided with the nut of an activity.
6. by the described rate of metal corrosion pick-up unit of claim 1, it is characterized in that: described data acquisition unit is installed in the shell, and outer casing bottom is provided with base frame, arranges probe interface and power supply communication interface on the base frame.
7. by the described rate of metal corrosion pick-up unit of claim 6, it is characterized in that: described probe interface and power supply communication interface adopt hermetically-sealed construction to be symmetrical arranged.
8. by the described rate of metal corrosion pick-up unit of claim 6, it is characterized in that: described probe interface and power supply communication interface adopt the eccentric setting of hermetically-sealed construction.
9. by the described rate of metal corrosion pick-up unit of claim 6, it is characterized in that: also be provided with jackscrew on the described base frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206428138U CN201897564U (en) | 2010-12-05 | 2010-12-05 | Metallic corrosion rate detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206428138U CN201897564U (en) | 2010-12-05 | 2010-12-05 | Metallic corrosion rate detection device |
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| Publication Number | Publication Date |
|---|---|
| CN201897564U true CN201897564U (en) | 2011-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206428138U Expired - Lifetime CN201897564U (en) | 2010-12-05 | 2010-12-05 | Metallic corrosion rate detection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102645487A (en) * | 2012-05-09 | 2012-08-22 | 武汉中科创新技术股份有限公司 | Electromagnetic ultrasonic guided wave device |
| CN102998341A (en) * | 2012-10-30 | 2013-03-27 | 交通运输部公路科学研究所 | Device and method for testing corrosion degree of steel bundle |
| CN103207143A (en) * | 2012-01-13 | 2013-07-17 | 沈阳中科韦尔腐蚀控制技术有限公司 | Metal corrosion rate detection device with temperature detection double-test piece probe |
-
2010
- 2010-12-05 CN CN2010206428138U patent/CN201897564U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103207143A (en) * | 2012-01-13 | 2013-07-17 | 沈阳中科韦尔腐蚀控制技术有限公司 | Metal corrosion rate detection device with temperature detection double-test piece probe |
| CN102645487A (en) * | 2012-05-09 | 2012-08-22 | 武汉中科创新技术股份有限公司 | Electromagnetic ultrasonic guided wave device |
| CN102998341A (en) * | 2012-10-30 | 2013-03-27 | 交通运输部公路科学研究所 | Device and method for testing corrosion degree of steel bundle |
| CN102998341B (en) * | 2012-10-30 | 2014-08-20 | 交通运输部公路科学研究所 | Device and method for testing corrosion degree of steel bundle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENYANG ZKWELL CORROSION CONTROL TECHNOLOGY CO., Free format text: FORMER OWNER: ZHENG LIQUN Effective date: 20130819 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 110042 SHENYANG, LIAONING PROVINCE TO: 110180 SHENYANG, LIAONING PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20130819 Address after: 110180 Liaoning Province, Shenyang Hunnan Hunnan four Road No. 1, Room 501 Patentee after: Shenyang Zkwell Corrosion Control Technology Co., Ltd. Address before: 110042 Liaoning District of Shenyang City Plaza Street No. 11 5-10-2 Patentee before: Zheng Liqun |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110713 |