CN103207143B - Metal corrosion rate detection device with temperature detection double-test piece probe - Google Patents
Metal corrosion rate detection device with temperature detection double-test piece probe Download PDFInfo
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- CN103207143B CN103207143B CN201210009675.3A CN201210009675A CN103207143B CN 103207143 B CN103207143 B CN 103207143B CN 201210009675 A CN201210009675 A CN 201210009675A CN 103207143 B CN103207143 B CN 103207143B
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Abstract
The invention relates to a metal corrosion rate detection device with a temperature detection double-test piece probe. The device includes a double-test piece probe, a probe adapter, a power supply communication adapter, a metal corrosion rate detector and a detection circuit. The double-test piece probe is connected to the metal corrosion rate detector through the probe adapter, and the power supply communication adapter is in connection with the metal corrosion rate detector. With the advantages of simple structure, longer service life, safety and reliability, etc., the metal corrosion rate detection device provided in the invention is applicable in any medium condition and higher pressure and temperature conditions, thus having wide practicability.
Description
Technical field
The present invention relates to a kind of novel metal corrosion-detection probe and device, specifically a kind of metallic corrosion rate detection device with the two test piece probe of temperature detection.
Background technology
Recent year chemical enterprise refines high-sulfur, high-acid crude oil in a large number, equipment corrosion is aggravated, the problem brought is also further serious, corrosion is continuous to bring economic loss to enterprise and threatens the life of people, and the generation of corrosion detects in real time corrosion and proposes higher requirement, is not only the result of corrosion measurement, to the influence factor that corrosion occurs, as temperature, research simultaneously reduces the method for corrosion, and the selection etc. as equipment proposes new requirement.For Petrochemical Corrosion can be divided into cold end corrosion and high temperature corrosion, and cold end corrosion mainly contains the galvanic corrosion etc. of the galvanic corrosion of industrial colling, the water of crude oil medium and sulfuretted hydrogen, hydrochloric acid, and high temperature corrosion mainly contains sulfide thermal chemical damage.The method that low temperature position Corrosion monitoring is conventional is electrochemistry linear polarization and low-temperature resistance probe measurement technique, and the Corrosion monitoring of high temperature position adopts high temperature resistance probe technique.Electrochemical measurement adopts linear polarization measuring method, and what its measurement result reflected is the instantaneous corrosion of medium to metal, has been only applicable to electrolytical ambient condition, and therefore application is restricted, and measurement result is subject to the impact of system can produce the error of maximum 200%.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 apply in all media, resistance probe is divided into filament and tubular structure, the sensitivity of filament probe measurement is too low, thus the numerical value of low corrosion speed cannot be measured at short notice, filiform corrosion test specimen sectional area is little simultaneously, intensity is low, life-span is short, due to the defect of local corrosion and temperature compensation, also larger error can be produced to measurement result.Tubular structure probe measurement highly sensitive, but due to probe corrosion coupon thinner, bear pressure less, service time is shorter, needs frequently to change, and thus applies under high temperature and high pressure environment and is restricted.Inductance probe measuring method is corrosion monitoring technology newly developed recent years, though its method is very unique, but practical application is at present rarer, subject matter is that sinusoidal signal and cosine signal requirement Complete Synchronization could realize measuring exact requirements, it is more difficult that hardware circuit realizes Complete Synchronization, and meanwhile, the inductive coil temperature influence inductance value of inductance probe inside is with temperature drift, the environmental measurement very harsh in industry spot is unstable, and technical progress is slow.No matter electrochemical measuring technology, resistance probe measuring technique or its measurement result of inductance probe measuring technique are single corrosion rate or corrosion losses, can not meet the management expectancy of enterprise to production equipment far away.
Summary of the invention
For above shortcomings part in prior art, the technical problem to be solved in the present invention be to provide a kind of highly sensitive, intensity is large, the life-span is long, multiple measurement parameter, be applicable to the metallic corrosion rate detection device of the two test piece probe of band temperature detection of various ambient condition and process conditions.
The technical solution used in the present invention is:
A kind of metallic corrosion rate detection device with the two test piece probe of temperature detection, comprise two test piece probe, probe adapter, power supply communications adapter, rate of metal corrosion detector and testing circuit, it is characterized in that: described two test piece probes are connected with rate of metal corrosion detector by probe adapter, and power supply communications adapter is connected with rate of metal corrosion detector;
Two test piece probes of described band temperature detection, comprise protection to emit, compensate test piece, corrosion coupon, compensate test piece, corrosion coupon, temperature detection device, retaining ring, probe rod, filler, inner lead, transition conduit, probe socket receptacle, corrosion coupon is material of the same race with compensating test piece, corrosion coupon is material of the same race with compensating test piece, compensate test piece, be arranged on corrosion coupon inside, and the front end compensating test piece is connected with corrosion coupon solid welding respectively, corrosion coupon and probe rod adopt welding connecting mode, probe rod is welded by transition conduit with probe socket receptacle, inner lead is connected with probe socket receptacle with transition conduit through the probe rod of hollow, probe rod inside has filler to fill, temperature detection device is fixed on the front end of probe rod, protection is emitted and is had multiple medium opening,
Described probe adapter, comprise probe adapter bar, the two ends of probe adapter bar be fixed with respectively plug connector, probe adapter bar is equiped with two for locking the locking screw of two test piece probe and rate of metal corrosion detector, the plug connector at adapter bar two ends respectively with the probe interface grafting of probe socket receptacle and rate of metal corrosion detector, the plug connector at probe adapter two ends is connected with the wire in probe adapter bar respectively, is equiped with filler in probe adapter bar;
Described power supply communications adapter, comprise power supply adaptor bar, one end of power supply adaptor bar fixedly has externally threaded sleeve pipe, sleeve pipe place is fixed with extension line, the other end of power supply adaptor bar is fixed with plug connector, and power supply adaptor bar is equipped with set nut, is equiped with wire in power supply adaptor bar, one end of wire connects plug connector, and its other end is connected with extension line.The inserted terminal of power supply communications adapter is connected with the power supply communication interface of rate of metal corrosion detector, and extension line connects power supply and the communication bus of detection system.What the plug connector of power supply communications adapter was plugged on power supply adaptor patches end;
Described rate of metal corrosion detector comprises housing, and base frame is stainless steel, and housing is threaded with base frame, has O-ring seal between housing and base frame.Base frame has a jackscrew, has a label fixed position, and detector probe interface is 12 pin connector pin ends, glass capsulation.Detector power supply communication interface is 6 pin glass capsulation device pin ends; Described testing circuit is arranged in the circuit board, and wiring board is arranged in the housing of rate of metal corrosion detector;
Above-mentioned testing circuit comprises high-precision meter amplifier A3, A4 as exciter response UF1, UB1, UF2, UB2, input, the object of employing Differential Input is the interference for reducing signal, output signal carries out signal madulation A7, A8 after the further amplification of high precision operating amplifier A5, A6, AC signal is modulated into direct current signal, input analog-to-digital converter.Microprocessor controls feedback system passage A9 according to the size of signal and exports, and control system feedback channel A7 is made up of amplifier and signal transformer, and its voltage signal exported directly acts on the input end of probe.K1-K12 realizes alternately measuring of two test piece.Microcontroller by temperature detection device through temperature signal regulation unit A2 measuring media temperature, by communication unit and control system communication.
The present invention has following beneficial effect and advantage:
1.. because the thickness range measuring test piece is large, when adopting thin test piece, there is higher resolution, there is higher security and longer serviceable life when adopting thick test piece.
2.. owing to adopting tubular structure corrosion coupon, the measuring error that local corrosion is brought is little.
3.. two test piece probe has the comparability of data and the popularity (as selection) of application.
4.. the correlativity (as temperature) of Corrosion results and corrosion factor.
5.. the temperature compensation mode of special construction, makes temperature variation little on measurement result impact.
6.. accurately can measure the corrosion condition of commercial unit online.
7.. can apply under any ambient condition.
8.. signal can be applied continuously, thus there is higher sensitivity.
9.. adopt signal transformer to apply exchange way, only measure the induced voltage at test piece two ends, there is higher antijamming capability and obtain measurement result accurately.
10.. meet industry spot requirement of explosion proof.
. easy and simple to handle, safety.
Accompanying drawing explanation
Fig. 1 is metallic corrosion rate detection device structural representation of the present invention.
Fig. 2 is two test piece probe structure schematic diagram of band temperature detection of the present invention.
Fig. 3 is probe adapter structural representation of the present invention.
Fig. 4 is power supply communications adapter structural representation of the present invention.
Fig. 5 is the circuit diagram of rate of metal corrosion detector structure of the present invention.
Fig. 6 is the base frame structural representation of rate of metal corrosion detector of the present invention.
Fig. 7 is the circuit theory diagrams of rate of metal corrosion measurement device of the present invention.
Embodiment
The metallic corrosion rate detection device of the two test piece probe of band temperature detection of the present invention, comprise two test piece probe 4, probe adapter 2, power supply communications adapter 3, rate of metal corrosion detector 1 and testing circuit, two test piece probe 4 is connected with rate of metal corrosion detector 1 by probe adapter 2, and power supply communications adapter 3 is connected with rate of metal corrosion detector 1, two test piece probe 4, comprise protection and emit 5, compensate test piece 8, corrosion coupon 7, compensate test piece 10, corrosion coupon 9, temperature detection device 11, retaining ring 12, probe rod 13, filler 15, inner lead 14, transition conduit 16, probe socket receptacle 17, measuring sensor corrosion coupon 7 is material of the same race with compensating test piece 8, measuring sensor corrosion coupon 9 is material of the same race with compensating test piece 10, compensate test piece 8, 10 are arranged on corrosion coupon 7, 9 is inner, and compensate test piece 8, the front end of 10 respectively with corrosion coupon 7, 9 solid weldings connect, corrosion coupon 7, 9 adopt welding connecting mode with probe rod 13, probe rod 13 is welded by transition conduit 16 with probe socket receptacle 17, inner lead 14 is through the probe rod 13 of hollow, transition conduit 16 is connected with probe socket receptacle 17, probe rod 13 inside has filler 15 to fill.Temperature detection device 11 is fixed on the front end of probe rod 13, and protection is emitted on 5 and had multiple medium opening 6;
Probe adapter 2, comprise probe adapter bar 21, the two ends of probe adapter bar 21 are fixed with plug connector 18,23 respectively, probe adapter bar 21 is equiped with two for locking the set nut 19,24 of two test piece probe 4 and rate of metal corrosion detector 1, plug connector 18,23 respectively with probe interface 33 grafting of probe socket receptacle 17 and rate of metal corrosion detector 1, and to be locked respectively by set nut 19,24.The plug connector 18,23 at probe adapter two ends is connected with the wire 22 in probe adapter bar 21 respectively, is equiped with filler 20 in probe adapter bar 21;
Power supply communications adapter 3, comprise power supply adaptor bar 26, one end of power supply adaptor bar 26 fixedly has externally threaded sleeve pipe 30, sleeve pipe 30 place is fixed with extension line 29, the other end of power supply adaptor bar 26 is fixed with plug connector 28, power supply adaptor bar 26 is equipped with set nut 27, is equiped with wire 25 in power supply adaptor bar 26, one end of wire 25 connects connector, and its other end is connected with extension line 29.The connector 28 of power supply communications adapter 3 is connected with the power supply communication interface 32 of detector, and extension line 29 connects power supply and the communication bus of detection system.What power supply communications adapter connector 28 was plugged on power supply adaptor 3 patches end;
Rate of metal corrosion detector 1, comprises housing 36, and base frame 37 is stainless steel, and housing 36 is threaded with base frame 37, has O-ring seal between housing 36 and base frame 37.Base frame has a jackscrew 34, has a label fixed position 35, and probe interface 33 is 12 pin connector pin ends, glass capsulation.Detector power supply communication interface 32 is 6 pin glass capsulation device pin ends; Described testing circuit is arranged on wiring board 31, and wiring board 31 is arranged in the housing 36 of rate of metal corrosion detector 1;
Testing circuit, comprise high-precision meter amplifier A3, A4 as exciter response UF1, UB1, UF2, UB2, input, the object of employing Differential Input is the interference for reducing signal, output signal carries out signal madulation A7, A8 after the further amplification of high precision operating amplifier A5, A6, AC signal is modulated into direct current signal, input analog-to-digital converter.Microprocessor controls feedback system passage A9 according to the size of signal and exports, and control system feedback channel A7 is made up of amplifier and signal transformer, and its voltage signal exported directly acts on the input end of probe.K1-K12 realizes alternately measuring of two test piece.Microcontroller by temperature detection device through temperature signal regulation unit A2 measuring media temperature, by communication unit and control system communication.
Metallic corrosion rate detection device with the two test piece probe of temperature detection is to measure based on metal erosion loss, to be realized the measurement of corrosion speed by the resistance variations measuring corrosion coupon.When two test piece probe material is not identical metal material, under measurement data embodies same media and process conditions, the equipment corrosion situation of unlike material, for equipment selection provides scientific basis.The temperature sensor synchro measure medium temperature that probe is built-in, embodies the influence factor that corrosion occurs.
The resistance of corrosion coupon increases along with metal erosion loss, and the time dependent function curve of measuring resistance can obtain metal loss amount function curve in time, namely average corrosion rate.The resistance variation with temperature of corrosion coupon can increase or reduce on the other hand, in order to eliminate the measuring error brought due to temperature variation, measured by temperature-compensation circuit and eliminate the impact of temperature on measurement result with corrosion coupon in the compensation test piece of the identical material of same temperature condition, namely with supplementary test piece for benchmark, measure the resistance variations of corrosion coupon.During circuit design, two test piece is alternately measured, simultaneously measuring media temperature and by measurement result by communication unit uploading detection system.
Refer to Fig. 7 wherein: RB1, RF1 are respectively compensation test piece and the corrosion coupon of one of two test piece probe, RB2, RF2 are respectively compensation test piece and the corrosion coupon of two test piece probe two, realize two test piece probe by K1-K12 alternately to measure, A1 is temperature detection device, A2 is temperature signal regulation unit, A3-A8 is detection system Measurement channel, and A9 is detection system feedback channel.
This circuit adopts high input impedance, high-precision meter amplifier (A3, A4) as exciter response UF1, UB1, UF2, UB2, input, the object of employing Differential Input is the interference for reducing signal, output signal carries out signal madulation (A7, A8) after the further amplification of high precision operating amplifier (A5, A6), AC signal is modulated into direct current signal, input analog-to-digital converter.Microprocessor controls feedback system passage (A9) according to the size of signal and exports, and control system feedback channel (A7) is made up of amplifier and signal transformer, and its voltage signal exported directly acts on the input end of probe.K1-K12 realizes alternately measuring of two test piece.Microcontroller by temperature detection device through temperature signal regulation unit (A2) measuring media temperature.By communication unit and control system communication.
RF1 is along with the increase of corrosion of metal resistance, and variation with temperature increases or reduces simultaneously, and a RB1 resistance variation with temperature increases or reduction.
In like manner, RF2 is along with the increase of corrosion of metal resistance, and variation with temperature increases or reduces simultaneously, and a RB2 resistance variation with temperature increases or reduction.
By detection system feedback channel A9, to grounded circuit, alternating current excitation signal is applied to RB1, RF1, RB2, RF2, the induced voltage that measurement RF1, RB1, (RF2, RB2 are in like manner) hold, corresponding U
f1, U
b1, calculate the change of RF1, RB1:
U
F1= RF1×I
H
U
B1= RB1×I
H
Wherein: I
hfor flowing through the electric current of corrosion coupon and compensation test piece.
After A7 being amplified by feedback control loop, S point voltage is steady state value 1 volt, and this voltage is as the benchmark of A/D converter.
----------------------------①
Have again:
----------------------------②
----------------------------③
Wherein: ρ is metallic resistance rate, changes with temperature
LF1, LB1 are corrosion coupon and the length compensating test piece, are constant.
SF1, SB1 are corrosion coupon and the area compensating test piece, and SF1 is along with corrosion of metal thickness is thinning, area reduces, and SB1 is constant.
Due to: SF1=HF1 × WF1----------------------------4.
Wherein: HF1 is corrosion coupon thickness, WF1 is corrosion coupon width, known.
1., 2., 3., 4. obtained by formula:
----------------------------⑤
From formula 5., just can be obtained the Reducing thickness of corrosion coupon by the response signal measuring test piece and corrosion coupon, thus draw corrosion of metal speed.
Test piece response analog voltage through digitizing analog to digital conversion, after corrosion coupon thickness HF digitizing:
H
FS=(262144*0.5)/ HF-262144
Claims (2)
1. the metallic corrosion rate detection device with the two test piece probe of temperature detection, comprise two test piece probe (4), probe adapter (2), power supply communications adapter (3), rate of metal corrosion detector (1) and testing circuit, it is characterized in that: described two test piece probes (4) are connected with rate of metal corrosion detector (1) by probe adapter (2), and power supply communications adapter (3) is connected with rate of metal corrosion detector (1), described two test piece probes, comprise protection and emit (5), first compensates test piece (8), first corrosion coupon (7), second compensates test piece (10), second corrosion coupon (9), temperature detection device (11), retaining ring (12), probe rod (13), filler (15), inner lead (14), transition conduit (16), probe socket receptacle (17), the first corrosion coupon (7) and first compensates test piece (8) for material of the same race, and the second corrosion coupon (9) and second compensates test piece (10) for material of the same race, and first compensates test piece (8), second compensates test piece (10) is arranged on the first corrosion coupon (7), second corrosion coupon (9) is inner, and first compensates test piece (8), second compensate test piece (10) front end respectively with the first corrosion coupon (7), second corrosion coupon (9) solid welding connects, the first corrosion coupon (7), second corrosion coupon (9) and probe rod (13) adopt welding connecting mode, and probe rod (13) is welded by transition conduit (16) with probe socket receptacle (17), and inner lead (14) is through the probe rod (13) of hollow, transition conduit (16) is connected with probe socket receptacle (17), and probe rod (13) inside has filler (15) to fill, and temperature detection device (11) is fixed on the front end of probe rod (13), and protection is emitted on (5) and had multiple medium opening (6),
Described probe adapter (2), comprise probe adapter bar (21), the two ends of probe adapter bar (21) are fixed with the first plug connector (18) respectively, second plug connector (23), probe adapter bar (21) is equiped with two for locking first set nut (19) of two test piece probe (4) and rate of metal corrosion detector (1), second set nut (24), first plug connector (18), second plug connector (23) respectively with probe interface (33) grafting of probe socket receptacle (17) and rate of metal corrosion detector (1), and respectively by the first set nut (19), second set nut (24) is locked, first plug connector (18), second plug connector (23) at probe adapter two ends are connected with the probe adapter wire (22) in probe adapter bar (21) respectively, are equiped with filler (20) in probe adapter bar (21),
Described power supply communications adapter (3), comprise power supply adaptor bar (26), one end of power supply adaptor bar (26) fixedly has externally threaded sleeve pipe (30), sleeve pipe (30) place is fixed with extension line (29), the other end of power supply adaptor bar (26) is fixed with the 3rd plug connector (28), power supply adaptor bar (26) is equipped with the 3rd set nut (27), power supply communications adapter wire (25) is equiped with in power supply adaptor bar (26), one end of power supply communications adapter wire (25) connects the 3rd plug connector (28), its other end is connected with extension line (29), 3rd plug connector (28) of power supply communications adapter (3) is connected with the power supply communication interface (32) of rate of metal corrosion detector (1), extension line (29) connects power supply and the communication bus of detection system,
Described rate of metal corrosion detector (1) comprises housing (36) and base frame (37), housing (36) is threaded with base frame (37), O-ring seal is had between housing (36) and base frame (37), base frame has a jackscrew (34), there is a label fixed position (35), detector probe interface (33) is 12 pin connector pin ends, glass capsulation, and detector power supply communication interface (32) is 6 pin glass capsulation device pin ends; Described testing circuit is arranged on wiring board (31), and wiring board (31) is arranged in the housing (36) of rate of metal corrosion detector (1).
2. a kind of metallic corrosion rate detection device with the two test piece probe of temperature detection according to claim 1, it is characterized in that described testing circuit, comprise high-precision meter amplifier A3, A4 is as exciter response first corrosion coupon UF1, first compensates test piece UB1, second corrosion coupon UF2, the input of the second compensation test piece UB2, output signal is through high precision operating amplifier A5, at signal modulator A7 after the further amplification of A6, signal madulation is carried out in A8, AC signal is modulated into direct current signal, input analog-to-digital converter, microprocessor exports according to the size control system feedback channel A9 of signal, control system feedback channel A9 is made up of amplifier and signal transformer, its voltage signal exported directly acts on the input end of probe, K1-K12 realizes alternately measuring of two test piece, microcontroller by temperature detection device through temperature signal regulation unit A2 measuring media temperature, by communication unit and control system communication.
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| CN104931413A (en) * | 2015-06-15 | 2015-09-23 | 沈阳中科韦尔腐蚀控制技术有限公司 | Inductance probe with double-tube-shaped structure |
| CN107290274A (en) * | 2017-05-15 | 2017-10-24 | 中国石油化工股份有限公司 | A kind of high voltage induction probe for measuring rate of metal corrosion and its compensation method |
| CN111505056A (en) * | 2020-04-17 | 2020-08-07 | 江苏中矿大正表面工程技术有限公司 | All-weather online monitoring system and method for bridge cable corrosion |
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