CN103866330A - Cathodic protection site online monitoring and evaluating method - Google Patents
Cathodic protection site online monitoring and evaluating method Download PDFInfo
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- CN103866330A CN103866330A CN201410089663.5A CN201410089663A CN103866330A CN 103866330 A CN103866330 A CN 103866330A CN 201410089663 A CN201410089663 A CN 201410089663A CN 103866330 A CN103866330 A CN 103866330A
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Abstract
The invention discloses a cathodic protection site online monitoring and evaluating method which is used for monitoring the state and evaluating the effect of a cathodic protection system of equipment such as buried pipelines in a high-risk oil and gas transmission station. The method comprises the following steps: 1) adopting a buried saturated copper sulfate reference electrode and a site buried pipeline as a cathodic protection potential monitor; 2) transmitting cathodic protection signals of the monitor to a receiver outside the station by using a data cable; 3) carrying out data transmission on cathodic protection potential signals with a computer through A/D (Analog to Digital) conversion via a communicator; 4) monitoring a cathodic protection potential value and a cathodic protection current value on line in real time; 5) setting a valid cathodic protection potential range; 6) judging the validity of the cathodic protection potential in real time and giving out an evaluating result; and 7) warning when the evaluating result is abnormal and giving out a treatment scheme aiming at common problems. The method has the advantages of good universality, high degree of automation, high monitoring precision and real-time warning.
Description
Technical field
The invention belongs to corrosion and protection technical field, be specifically related to a kind of method that is applicable to the on-the-spot on-line monitoring of field, high-risk natural gas transport station galvanic protection and evaluation.
Background technology
In oil, Sweet natural gas accumulating, equipment used, as pipeline great majority are embedded in below ground, suffers the corrosion of soil media; At the bottom of the tank of storage petroleum storage tank, also contact with soil media, be subject to the corrosion of soil media.The corrosion in edatope of steel pipe and storage tank is very serious, once because corrosion produces perforation, cause leakage accident, can produce huge financial loss, need stopping transportation that equipment is overhauled and keeped in repair, the leakage of delivery medium has also caused seriously and has polluted environment.For example, China Petrochemical Industry Qingdao " 1112 " the transition pipeline explosion hazard of domestic generation in 2013, causes that 62 people are wrecked, 136 people are injured, 7.5 hundred million yuan of direct economic losses, and rising because of oil pipeline and the corrosive pipeline attenuation of discharge channel intersection of accident broken.In order to prevent from carrying or storing the caused leakage accident of corrosion of oil, Sweet natural gas hardware, many enterprises take periodic replacement equipment; Many units have carried out the corrosion research test of hardware, have taked certain safeguard procedures.
At present, pipeline, these buried hardwares of storage tank are adopted the associating safeguard procedures of macromolecular material coat and galvanic protection.Coat, to cut off contacting of hardware and soil media, reduces the area of bare metallic surface, the total current of reduction galvanic protection; Galvanic protection applies relatively (soil media) more negative current potential to these buried metal equipment; make hardware in the potential range of corrosion does not occur, the bare metallic surface that this protection can protect the inevitable aging cracking causing of pin hole, life-time service existing of coat, various physical abuse to produce.Because coat is synchronizeed with the construction of these buried equipment, later detection and maintenance difficult, so the key of associating safeguard procedures is the validity that guarantees galvanic protection.
Guarantee the validity of galvanic protection, must guarantee: (1) galvanic protection equipment moves incessantly; (2) the current potential moment of protected pipeline each point is in effective protective potential range.Accomplish this 2 point, need to the protection potential of typical parts be detected and be evaluated, pinpoint the problems in time, solve in time.
The detection of cathodic protection potential at present adopts artificial regular detection, and suitable sense cycle is 1 month.Sense cycle is long, is difficult to guarantee the validity of galvanic protection, and detection time is too short, and testing cost increases severely, uneconomical.For such high-risk place, field, natural gas transport station, manual detection is brought certain unsafe factor to station frequently, can not meet the special safety requirements in field to Ran Qi dispatch station.
Along with the prolongation of time, the coating water suction of buried pipeline, the aging and damaged cathodic protection potential that all can affect, cause the decline of cathodic protection potential, makes the facilities such as part buried pipeline can protect deficiency.Meanwhile, also may cause the interference between different buried pipelines, affect the validity of cathodic protection system.Due to the narrow space of field, natural gas transport station; the maintenance of pipeline and valve, the construction of expansion reconstruction project all can produce certain impact to the protection potential of existing cathodic protection system; all need the protection potential of buried pipeline to detect in time; find the situation of galvanic protection deficiency or overprotection, and artificial detection is to be difficult to find in time these problems.
The evaluation of manual detection result determined by experience often, not too accurate, is difficult to reflect the particular case of galvanic protection.Testing staff's replacing, often brings difficulty to the evaluation of detected result, the more difficult evaluation of historical results of anticathode protection.
In order to solve the deficiency of field, high-risk natural gas transport station buried pipeline cathode protecting state manual detection; dangerous, difficult evaluation not in time; the present invention is specifically related to the method for the on-the-spot on-line monitoring of a kind of galvanic protection and evaluation; for the state of field, high-risk oil and gas transmission station cathodic protection system is monitored and effect assessment, to guarantee the validity of cathodic protection system and the safety of field, natural gas transport station.
Summary of the invention
The object of the present invention is to provide the method for the on-the-spot on-line monitoring of a kind of galvanic protection and evaluation, as facility cathode protecting states such as field, high-risk natural gas transport station buried pipelines, the monitoring and evaluation means of typical case monitoring point cathodic protection potential, these data of real time on-line monitoring also contrast with given active cathodic protective potential range, and evaluate and provide evaluation result, find in time the problem that cathodic protection system exists and send early warning information, guarantee that cathodic protection system effectively moves, thereby effectively suppress the anodic oxidation reactions of pipeline material in edatope, prevent or slow down the soil corrosion of buried pipeline etc., prevent the accident such as leakage that corrosion causes, also reach the object in work-ing life that extends pipeline etc. in corrosive atmosphere.Level of automation is high, saves handling cost; Monitoring accuracy is high, and evaluation result is accurate; Early warning is timely, guarantees the validity of galvanic protection.
To achieve these goals, the technical solution used in the present invention is: the method for the on-the-spot on-line monitoring of a kind of galvanic protection and evaluation, comprises the following steps:
The first, using buried copper/saturated copper sulphate reference electrode and on-the-spot buried pipeline as cathodic protection potential monitor, the two forms a two-electrode system, in the time applying galvanic protection to pipeline, pipeline exposed surface current potential of electrostatic double layer in edatope moves towards negative direction, and the measurement of this current potential is relatively buried copper/saturated copper sulphate reference electrode;
The second, the cathodic protection potential signal on monitor is transmitted to the outer receptor that arrives at a station, in the analogue value of the output terminal output cathode protection potential of receptor, the cathodic protection potential of exporting and electrochemistry regulation differ a negative sign, being output as on the occasion of, the cathodic protection potential of each monitoring point is output signal altogether;
Three, the output cathode protection potential signal of monitor is connected with AD converter input terminus, AD converter output terminal connects in the input terminus of data communication equipment, the output terminal of data communication equipment is connected to computer C 0 M serial data communication port by 9 needle serial port lead-in wires, for the cathodic protection potential signal at computer software timing acquiring scene;
Four, use the electric potential signal of cathodic protection potential monitoring software system real time on-line monitoring galvanic protection, operational monitoring software MCPL05, program operational scheme is: 1) timer of galvanic protection data monitoring is set, by 24 hours gather 1000 times calculate, timer be spaced apart 1.44 minutes; 2) timer sends data gathering instruction, is sent to AD converter by computer C 0 M serial data communication port and data communication equipment, and the output cathode protection potential signal of monitor is converted to digital quantity by AD converter; 3) digital quantity is sent into computer by data communication equipment and computer C 0 M serial data communication port and is carried out data gathering, the binary data stream obtaining; 4) binary data collecting is converted to decimal data; 5) ten's digit according to this mode of data and curve show by computer screen, carry out a secondary data preservation every day, complete after data gathering, data processing and an evaluation of result, send again instruction, carry out data gathering for the second time, so circulation, continuous data collection is set as 10 years;
The 5th, set effective potential range of galvanic protection, comprise and determine effective potential range of galvanic protection and the effective potential range to monitoring of software input galvanic protection, application hit potentiometry is determined effective potential range of buried pipeline monitoring point galvanic protection, method is: adjust a little higher than normal value of cathodic protection potential value of cathodic protection potentiostat as 1300mV, polarize and within 10 hours, guarantee that cathodic protection system is in steady state, on monitoring of software MCPL05, open hit potential measurement sub-routine and start test, testing software records cathodic protection potential over time, after 5 ~ 10 minutes, close cathodic protection potentiostat, slowly decay in time after the cathodic protection potential value of power-off point monitoring declines suddenly, wait for after 12 ~ 24 hours, the effect completely dissolve of galvanic protection, the corrosion potential value V that the pipeline potential value of now measuring is buried pipeline
cORR, the cathodic protection potential on curve before power-off is V
p, after power-off, cathodic protection potential is reduced to suddenly V
c, difference (V
p-V
c) V (IR)=V falls in the IR that is called pipeline-Soil Interface
p-V
c, IR falls because not playing galvanic protection effect to be needed to remove, and must in the time determining effective potential range of galvanic protection, consider, and the lower value of definite effective potential range of galvanic protection is V (IR)+V
cORR+ 100mV, higher limit V (IR)+V
cORR+ 200mV, obtain after effective potential range, this effective current potential is kept on hard disc of computer, monitoring of software can read in the criterion of this effective potential range as Evaluation of Cathodic Protection while startup automatically, monitoring of software often carries out after a data acquisition and processing (DAP), the monitor value of cathodic protection potential and this effect potential range value can be contrasted, judge the validity of galvanic protection.
Six, the validity of real-time judge monitoring galvanic protection, provide evaluation result, specific practice is: the cathodic protection potential value collecting and this effective potential range are contrasted, if the cathodic protection potential of monitoring is in this effective potential range, judge that evaluation result is as effective protection; If the cathodic protection potential of monitoring is within the scope of the effective potential range upper limit+50mV, evaluation result is overprotection; If the cathodic protection potential of monitoring is within the scope of effective potential range lower limit-50mV, evaluation result is under proteciton; If the cathodic protection potential of monitoring is lower than effective potential range lower limit-50mV, evaluation result is to adjust under proteciton needs; If the cathodic protection potential of monitoring is higher than the effective potential range upper limit+50mV, evaluation result is that overprotection needs to adjust, and the result of Real-Time Evaluation shows on computer screen with mode word;
The 7th, when evaluation result is abnormal, carry out early warning, provide processing scheme for FAQs, if being needs adjustment under proteciton or overprotection, evaluation result needs to adjust, monitoring of software sends early warning information automatically, and the method for early warning has 2 kinds: the one, early warning information is sent to managerial personnel's mailbox by e-mail; The 2nd, notify managerial personnel by the note cat being connected with computer in the mode of SMS by early warning information.
The invention has the beneficial effects as follows:
Because the present invention has adopted above method, cathodic protection potential and the cathode protecting state of the facilities such as field, high-risk natural gas transport station buried pipeline are carried out to on-the-spot on-line monitoring, the potential value of energy Real-Time Monitoring buried pipeline galvanic protection and the current value of galvanic protection, and monitor value is evaluated, intuitively show monitoring data and evaluation result by computer screen, when the evaluation result of cathodic protection system occurs when abnormal carrying out early warning by e-mail and SMS, reach the object of on-the-spot buried pipeline galvanic protection being carried out to precision management, due to monitoring, Evaluation is automatically to complete by software, save manpower, improve the precision of evaluating, can realize in time early warning, guarantee effective operation of on-the-spot cathodic protection system, block the soil corrosion of buried pipeline, prevent that corrosion from causing the generation of leakage accident, guarantee the safety in production of high-risk natural gas station.
The present invention has to be convenient to realize, and effect is remarkable, is convenient to promote, and has the advantages such as larger engineering potentiality.
Accompanying drawing explanation
Fig. 1 is system chart of the present invention.
Fig. 2 is data acquisition flow figure of the present invention.
Fig. 3 is hit potential test curve synoptic diagram of the present invention, and wherein Fig. 3 (a) is hit potential test curve power-off point curve figure; Fig. 3 (b) is hit potential test software sectional drawing.
Fig. 4 be in embodiment mono-potentiostat outward current with the change curve of monitoring time.
Fig. 5 be in embodiment mono-typical monitoring point cathodic protection potential value with the change curve of monitoring time.
Fig. 6 be in embodiment bis-typical potentiostat outward current with the change curve of monitoring time.
Fig. 7 be in embodiment bis-typical monitoring point cathodic protection potential value with the change curve of monitoring time.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment mono-
Pipeline two wires, capital, Shan terminal Caiyu is divided defeated station, is positioned at Caiyu town, Daxing district, Beijing, China, nearly 1200 m of Zhan Nei natural gas transport district area
2, 21 of buried pipelines, caliber, in Ф 33.7 mm ~ Ф 1016 mm scopes, has been applied the method for the on-the-spot on-line monitoring of a kind of galvanic protection of the present invention and evaluation.
With reference to Fig. 1, the method for the on-the-spot on-line monitoring of a kind of galvanic protection and evaluation, includes following steps:
First, according to the distribution of Caiyu station buried pipeline and the position of cathode connection point, select 11 monitoring points, in the dark reference electrode hole of each monitoring point excavation 1.2m, placing 1, long-acting copper/saturated copper sulphate electrode apart from the about 0.4m of pipe surface place, on pipeline, welding a monitoring wire, reference electrode lead-in wire and monitoring wire composition cathodic protection potential monitor, 2 lead-in wires of each monitoring point monitor are connected with RVVP2 × 0.5 cable, draw between the galvanic protection in the public district of the Office of Foreign Affairs of arriving at a station;
Second, the cable of each monitoring point is connected to the cathodic protection potential receptor input terminus between the public district's galvanic protection of the Office of Foreign Affairs of arriving at a station, in the analogue value of the output terminal output cathode protection potential of receptor, the cathodic protection potential of exporting and electrochemistry regulation differ a negative sign, being output as on the occasion of, the cathodic protection potential of each monitoring point is output signal altogether;
The 3rd, the output terminal of cathodic protection potential receptor is connected with 12 bit A/D converters (AD converter model is HT-TX301), the analogue value of cathodic protection potential is converted to digital quantity, the data line of AD converter is connected with data communication equipment (data communication equipment model is YD7688), and data communication equipment adopts standard 9 pin data lines to be connected to the COM1 serial line interface of computer;
The 4th, by cathodic protection potential monitoring software system, monitor the requirement of 1000 data every day by the every monitoring point of setting, every 1.44 minutes these galvanic protection data of Real-Time Monitoring, operational monitoring software MCPL05, with reference to Fig. 2, program operational scheme is: 1) timed interval is set is 1.44 minutes timers, i.e. every collection of carrying out a cathodic protection potential signal for 1.44 minutes; 2) timer sends data gathering instruction, is sent to AD converter by computer C 0 M serial data communication port and data communication equipment, and the output cathode protection potential signal of monitor is converted to digital quantity by AD converter; 3) digital quantity that AD converter is changed is sent into computer by data communication equipment and computer C 0 M serial data communication port again and is carried out data gathering, the binary data stream obtaining; 4) binary data collecting is converted to decimal data, i.e. the potential value of galvanic protection; 5) ten's digit according to this mode of data and curve show at computer screen, and evaluate, evaluation result shows at computer screen with mode word, complete after data gathering, data processing and an evaluation of result, send again instruction, carry out data gathering for the second time, so circulation is monitored continuously and evaluates, carry out a secondary data preservation every day, the cathodic protection potential of monitoring, current value, evaluation result and corresponding monitoring moment are kept on hard disc of computer in the mode of data file, and continuous data collection is set as 10 years;
The 5th, application hit potentiometry is determined effective potential range of buried pipeline monitoring point galvanic protection, method is: the cathodic protection potential of adjusting cathodic protection potentiostat is 1300mV, polarize after 10 hours, operation hit potential measurement sub-routine starts to test and records cathodic protection potential (referring to Fig. 3) over time, after 5 ~ 10 minutes, close cathodic protection potentiostat, slowly decay in time after the cathodic protection potential value of power-off point monitoring declines suddenly, wait for after 12 ~ 24 hours, on hit potential curve, read corrosion potential value V
cORR, V (IR)=V falls in IR
p-V
c, by V (IR)+V
cORR+ 100mV calculates the lower limit of the effective potential range of galvanic protection, by V (IR)+V
cORR+ 200mV calculates the upper limit of the effective potential range of galvanic protection, the lower limit of this effective potential range and higher limit are kept on hard disc of computer in the mode of data file by monitoring of software MCPL05, consider the variation of pipe surface state, within 1 year, carry out the effective potential range test of a galvanic protection, monitoring of software can read in the criterion of this effective potential range as Evaluation of Cathodic Protection while startup automatically, monitoring of software often carries out after a data acquisition and processing (DAP), the monitor value of cathodic protection potential and this effect potential range value can be contrasted, judge the validity of galvanic protection.
Table 1 is lower limit and the higher limit of effective potential range corresponding to internal cathodic protection monitoring point, 11 stations, Caiyu station;
Six, the validity of real-time judge monitoring galvanic protection, provide evaluation result, specific practice is: cathodic protection potential monitoring software system contrasts the data in the effective potential range value of the galvanic protection table 1 of the cathodic protection potential of at every turn monitoring and corresponding monitoring point, if the cathodic protection potential of monitoring, in this effective potential range, judges that evaluation result is as effective protection; If the cathodic protection potential of monitoring is within the scope of the effective potential range upper limit+100mV, evaluation result is overprotection; If the cathodic protection potential of monitoring is within the scope of effective potential range lower limit-50mV, evaluation result is under proteciton; If the cathodic protection potential of monitoring is lower than effective potential range lower limit-50mV, evaluation result is to adjust under proteciton needs, and buried pipeline does not reach protection needs the artificial output parameter of adjusting cathodic protection potentiostat; If the cathodic protection potential of monitoring is higher than the effective potential range upper limit+50mV, evaluation result is that overprotection needs to adjust, be that buried pipeline does not reach the output parameter that protection needs artificial adjustment cathodic protection potentiostat, the result of Real-Time Evaluation shows on computer screen with mode word, cathodic protection potential, evaluation result and the corresponding monitoring moment of monitoring are kept on hard disc of computer in the mode of data file, and for example in table 1, list in table 2 in the evaluation result in July, 2013 monitoring point 1;
The 7th, when evaluation result is abnormal, carry out early warning, provide processing scheme for FAQs, if being needs adjustment under proteciton or overprotection, evaluation result needs to adjust, monitoring of software sends early warning information by the mode of e-mail and SMS automatically, notify managerial personnel to adjust at the scene the potentiostat of galvanic protection, with reference to table 2, for example on July 1st, 2013, evaluation result was to adjust under proteciton needs, notify managerial personnel, after on-the-spot adjustment, with reach effective protection on July 8th, 2013, occur again that evaluation result is to adjust under proteciton needs on July 29th, 2013, system is notified managerial personnel in time, reach the object of on-the-spot on-line monitoring.
According to GB/T 21448-2008 " buried steel pipeline cathode protection technology standard " and GB/T 21246-2007 " buried steel pipeline cathode protecting parameter testing method "; impressed current cathodic protection system at least detects 1 time for 1-3 month; after employing the present invention, the monitoring of galvanic protection is spaced apart 1.44 minutes; realize real time on-line monitoring; simultaneously because monitoring, Evaluation are automatically to complete by software; save manpower, improved the precision of evaluating, can realize in time early warning.
Referring to Fig. 4, Fig. 4 be in embodiment mono-potentiostat outward current with the change curve of monitoring time, visible in the monitoring time of 1200 days (more than 3 years), potentiometer outward current changes in time in the larger context, wherein have and 2 times potentiometer is overhauled, close potentiostat, the position that in corresponding diagram, electric current is zero.
Referring to Fig. 5, Fig. 5 is that in embodiment mono-, typical monitoring point 1 cathodic protection potential value is with the change curve of monitoring time, and in about 0 ~ 300 day monitoring time, cathodic protection potential is more stable as seen; In about 300 ~ 450 days monitoring times, there is fluctuation in protection potential; In about 450 ~ 650 days monitoring times, cathodic protection potential is more stable; Then, cathodic protection potential has larger fluctuation in time; Therefore, the present invention can carry out Real-Time Monitoring and evaluation to the on-the-spot galvanic protection in Caiyu station, has obtained good effect, guarantees the validity of galvanic protection.
Embodiment bis-
Defeated station is divided in Yongqing, pipeline two wires, capital, Shan, is positioned at Langfang City Yongqing County, Hebei province, nearly 19000 m of Zhan Nei natural gas transport district area
2, 96 of buried pipelines, caliber, in Ф 33.7 mm ~ Ф 1016 mm scopes, has been applied the method for the on-the-spot on-line monitoring of a kind of galvanic protection of the present invention and evaluation.
With reference to Fig. 1, the method for the on-the-spot on-line monitoring of a kind of galvanic protection and evaluation, includes following steps:
The first, according to the distribution of Caiyu station buried pipeline and the position of cathode connection point, select 27 monitoring points, in the dark reference electrode hole of each monitoring point excavation 1.2m, placing 1, long-acting copper/saturated copper sulphate electrode apart from the about 0.4m of pipe surface place, and on pipeline, weld one and monitor wire, reference electrode lead-in wire and monitoring wire composition cathodic protection potential monitor, be connected 2 lead-in wires of each monitoring point monitor with RVVP2 × 0.5 cable, draw between the galvanic protection in the public district of the Office of Foreign Affairs of arriving at a station;
The second, the cable of each monitoring point is connected to the cathodic protection potential receptor between the public district's galvanic protection of the Office of Foreign Affairs of arriving at a station, in the analogue value of the output terminal output cathode protection potential of receptor, the cathodic protection potential of exporting and electrochemistry regulation differ a negative sign, being output as on the occasion of, the cathodic protection potential of each monitoring point is output signal altogether;
Three, the output terminal of cathodic protection potential receptor is connected with 12 bit A/D converters (model is HT-TX301), the analogue value of cathodic protection potential is converted to digital quantity, the data line of AD converter is connected with data communication equipment (data communication equipment model is YD7688), and data communication equipment adopts standard 9 pin data lines to be connected to the COM1 interface of computer;
Four, by cathodic protection potential monitoring software system, monitor the requirement of 1000 data every day by the every monitoring point of setting, every 1.44 minutes these galvanic protection data of Real-Time Monitoring, program operational scheme was: 1) timed interval is set is 1.44 minutes timers; 2) this timed interval is sent data gathering instruction, is sent to AD converter by computer C 0 M serial data communication port and data communication equipment, and AD converter is converted to digital quantity by the output cathode protection potential signal of monitor; 3) digital quantity that AD converter is changed is sent into computer by data communication equipment and computer C 0 M serial data communication port again and is carried out data gathering, the binary data stream obtaining; 4) binary data collecting is converted to decimal data; 5) ten's digit according to this mode of data and curve show at computer screen, and evaluate, evaluation result shows at computer screen with mode word, complete after data gathering, data processing and an evaluation of result, send again instruction, carry out data gathering for the second time, so circulation is monitored continuously and evaluates.In program, establish and carry out a secondary data preservation every day, the cathodic protection potential of monitoring, current value, evaluation result and corresponding monitoring moment are kept on hard disc of computer in the mode of data file, so circulation, continuous data collection is set as 10 years;
The 5th, set effective potential range of galvanic protection, comprise and determine effective potential range of galvanic protection and the effective potential range to monitoring of software input galvanic protection, application hit potentiometry is determined effective potential range of buried pipeline monitoring point galvanic protection, method is: the cathodic protection potential of adjusting cathodic protection potentiostat is 1300mV, polarize after 10 hours, operation hit potential measurement sub-routine starts to test and records cathodic protection potential over time, after 10 minutes, close cathodic protection potentiostat, wait for after 24 hours, on hit potential curve, read corrosion potential value V
cORR, V (IR)=V falls in IR
p-V
c, by V (IR)+V
cORR+ 100mV calculates the lower limit of the effective potential range of galvanic protection, by V (IR)+V
cORR+ 200mV calculates the upper limit of the effective potential range of galvanic protection, the lower limit of this effective potential range and higher limit are kept on hard disc of computer in the mode of data file by monitoring of software MCPL05, and table 3 is lower limit and the higher limit of 11 effective potential range corresponding to internal cathodic protection monitoring point of standing in monitoring point, 27, station, Yongqing,
Six, the validity of real-time judge monitoring galvanic protection, provide evaluation result, specific practice is: the data in the effective potential range value of the galvanic protection table 1 of the cathodic protection potential value collecting and corresponding monitoring point are contrasted, if the cathodic protection potential of monitoring, in this effective potential range, judges that evaluation result is as effective protection; If the cathodic protection potential of monitoring is within the scope of the effective potential range upper limit+100mV, evaluation result is overprotection; If the cathodic protection potential of monitoring is within the scope of effective potential range lower limit-50mV, evaluation result is under proteciton; If the cathodic protection potential of monitoring is lower than effective potential range lower limit-50mV, evaluation result is to adjust under proteciton needs, and buried pipeline does not reach protection needs the artificial output parameter of adjusting cathodic protection potentiostat; If the cathodic protection potential of monitoring is higher than the effective potential range upper limit+50mV, evaluation result is that overprotection needs to adjust, be that buried pipeline does not reach the output parameter that protection needs artificial adjustment cathodic protection potentiostat, the result of Real-Time Evaluation shows on computer screen with mode word, cathodic protection potential, evaluation result and the corresponding monitoring moment of monitoring are kept on hard disc of computer in the mode of data file, and for example in table 3, list in table 4 in the evaluation result in August, 2013 monitoring point 8;
The 7th; when evaluation result is abnormal, carry out early warning; provide processing scheme for FAQs; if being needs adjustment under proteciton or overprotection, evaluation result needs to adjust; monitoring of software sends early warning information by the mode of e-mail and SMS automatically; the potentiostat of notifying managerial personnel to adjust at the scene galvanic protection, with reference to table 4 in August, 2013 evaluation result be effectively protection, system does not send early warning information.
According to GB/T 21448-2008 " buried steel pipeline cathode protection technology standard " and GB/T 21246-2007 " buried steel pipeline cathode protecting parameter testing method "; impressed current cathodic protection system at least detects 1 time for 1-3 month; after employing the present invention, the monitoring of galvanic protection is spaced apart 1.44 min; realize real time on-line monitoring; simultaneously because monitoring, Evaluation are automatically to complete by software; save manpower, improved the precision of evaluating, can realize in time early warning.
Referring to Fig. 6, Fig. 6 is that in embodiment bis-, typical potentiostat outward current is with the change curve of monitoring time, and in the monitoring time of 1200 days, cathodic protection current is " step " formula in time slowly to be reduced; Be greater than after 800 days when the time of monitoring, cathodic protection current is " step " formula and slowly raises.
Referring to Fig. 7, Fig. 7 is that in embodiment bis-, typical monitoring point cathodic protection potential value is with the change curve of monitoring time, and in about 0 ~ 80 day monitoring time, cathodic protection potential increases gradually with monitoring time, arrives first peak value as seen; In about 80 ~ 200 days monitoring times, cathodic protection potential reduces in time, arrives first valley; In about 200 ~ 520 days monitoring times, galvanic protection increases again in time, arrives second peak value, so between peak value-valley, changes, and is mainly owing to occurring that the result of manually adjusting after under proteciton or overprotection is reported to the police causes; Therefore, the present invention can carry out Real-Time Monitoring and evaluation to the on-the-spot galvanic protection in station, Yongqing, has obtained good effect, guarantees the validity of galvanic protection.
Claims (1)
1. a method for the on-the-spot on-line monitoring of galvanic protection and evaluation, is characterized in that, comprises the following steps:
The first, using buried copper/saturated copper sulphate reference electrode and on-the-spot buried pipeline as cathodic protection potential monitor, the two forms a two-electrode system, in the time applying galvanic protection to pipeline, pipeline exposed surface current potential of electrostatic double layer in edatope moves towards negative direction, and the measurement of this current potential is relatively buried copper/saturated copper sulphate reference electrode;
The second, the cathodic protection potential signal on monitor is transmitted to the outer receptor that arrives at a station, in the analogue value of the output terminal output cathode protection potential of receptor, the cathodic protection potential of exporting and electrochemistry regulation differ a negative sign, being output as on the occasion of, the cathodic protection potential of each monitoring point is output signal altogether;
Three, the output cathode protection potential signal of monitor is connected with AD converter input terminus, AD converter output terminal connects in the input terminus of data communication equipment, the output terminal of data communication equipment is connected to computer C 0 M serial data communication port by 9 needle serial port lead-in wires, for the cathodic protection potential signal at computer software timing acquiring scene;
Four, use the electric potential signal of cathodic protection potential monitoring software system real time on-line monitoring galvanic protection, operational monitoring software MCPL05, program operational scheme is: 1) timer of galvanic protection data monitoring is set, by 24 hours gather 1000 times calculate, timer be spaced apart 1.44 minutes; 2) timer sends data gathering instruction, is sent to AD converter by computer C 0 M serial data communication port and data communication equipment, and the output cathode protection potential signal of monitor is converted to digital quantity by AD converter; 3) digital quantity is sent into computer by data communication equipment and computer C 0 M serial data communication port and is carried out data gathering, the binary data stream obtaining; 4) binary data collecting is converted to decimal data; 5) ten's digit according to this mode of data and curve show by computer screen, carry out a secondary data preservation every day, complete after data gathering, data processing and an evaluation of result, send again instruction, carry out data gathering for the second time, so circulation, continuous data collection is set as 10 years;
The 5th, set effective potential range of galvanic protection, comprise and determine effective potential range of galvanic protection and the effective potential range to monitoring of software input galvanic protection, application hit potentiometry is determined effective potential range of buried pipeline monitoring point galvanic protection, method is: adjust a little higher than normal value of cathodic protection potential value of cathodic protection potentiostat as 1300mV, polarize and within 10 hours, guarantee that cathodic protection system is in steady state, on monitoring of software MCPL05, open hit potential measurement sub-routine and start test, testing software records cathodic protection potential over time, after 5 ~ 10 minutes, close cathodic protection potentiostat, slowly decay in time after the cathodic protection potential value of power-off point monitoring declines suddenly, wait for after 12 ~ 24 hours, the effect completely dissolve of galvanic protection, the corrosion potential value V that the pipeline potential value of now measuring is buried pipeline
cORR, bust low potential (V on curve
p-V
c) V (IR)=V falls in the IR that is called pipeline-Soil Interface
p-V
c, IR falls because not playing galvanic protection effect to be needed to remove, and must in the time determining effective potential range of galvanic protection, consider, and the lower value of definite effective potential range of galvanic protection is V (IR)+V
cORR+ 100mV, higher limit V (IR)+V
cORR+ 200mV, obtain after effective potential range, this effective current potential is kept on hard disc of computer, monitoring of software can read in the criterion of this effective potential range as Evaluation of Cathodic Protection while startup automatically, monitoring of software often carries out after a data acquisition and processing (DAP), the monitor value of cathodic protection potential and this effect potential range value can be contrasted, judge the validity of galvanic protection,
Six, the validity of real-time judge monitoring galvanic protection, provide evaluation result, specific practice is: the cathodic protection potential value collecting and this effective potential range are contrasted, if the cathodic protection potential of monitoring is in this effective potential range, judge that evaluation result is as effective protection; If the cathodic protection potential of monitoring is within the scope of the effective potential range upper limit+50mV, evaluation result is overprotection; If the cathodic protection potential of monitoring is within the scope of effective potential range lower limit-50mV, evaluation result is under proteciton; If the cathodic protection potential of monitoring is lower than effective potential range lower limit-50mV, evaluation result is to adjust under proteciton needs; If the cathodic protection potential of monitoring is higher than the effective potential range upper limit+50mV, evaluation result is that overprotection needs to adjust, and the result of Real-Time Evaluation shows on computer screen with mode word;
The 7th, when evaluation result is abnormal, carry out early warning, provide processing scheme for FAQs, if being needs adjustment under proteciton or overprotection, evaluation result needs to adjust, monitoring of software sends early warning information automatically, and the method for early warning has 2 kinds: the one, early warning information is sent to managerial personnel's mailbox by e-mail; The 2nd, notify managerial personnel by the note cat being connected with computer in the mode of SMS by early warning information.
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