CN114703480B - Regional cathodic protection control method - Google Patents
Regional cathodic protection control method Download PDFInfo
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- CN114703480B CN114703480B CN202210393219.7A CN202210393219A CN114703480B CN 114703480 B CN114703480 B CN 114703480B CN 202210393219 A CN202210393219 A CN 202210393219A CN 114703480 B CN114703480 B CN 114703480B
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- 238000004210 cathodic protection Methods 0.000 title claims abstract description 31
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- 238000012360 testing method Methods 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 claims description 129
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- 230000001105 regulatory effect Effects 0.000 claims description 15
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- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000013480 data collection Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/04—Controlling or regulating desired parameters
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/10—Controlling or regulating parameters
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Abstract
A regional cathodic protection control method comprises the following steps: initial data acquisition, correlation test, correlation determination, system operation, operation data acquisition, standard comparison and system adjustment, wherein the system adjustment comprises constant power-on mode adjustment, constant power-off mode adjustment and constant current mode adjustment. The output channels in the embodiment of the invention have three adjustment modes, so that each output channel of the multi-channel potentiostat can adopt any working mode to automatically adjust the output, the good cathodic protection effect is ensured, and the coexistence requirement of multiple operation modes of the potentiostat in the actual area is met.
Description
Technical Field
The invention belongs to the technical field of cathodic protection and corrosion prevention, and particularly relates to a regional cathodic protection control method.
Background
With the increasingly prominent problem of corrosion of buried metal structures in areas such as oil and gas transmission sites, the regional cathodic protection technology is widely applied to domestic oil and gas transmission sites as a recognized and effective corrosion protection method, and achieves good effects. When the regional cathode protection technology is applied on a large scale, the control difficulty is also caused, and when the regional cathode protection technology is manually adjusted, the protection effect is uneven, and the problems of mutual interference of all loops, current shielding and the like cause the unsatisfactory control effect.
Therefore, the regional cathodic protection adopts an intelligent multipath potentiostat which has the function of intelligently regulating the output of each loop according to the multipoint polarization potential monitoring, but when the intelligent control of the intelligent potentiostat is relied on, the operation modes of all output channels of the potentiostat must be unified, and the requirements of coexistence of the multiple operation modes of the potentiostat for the practical regional cathodic protection are not consistent.
Disclosure of Invention
Aiming at the defects existing in the related art, the invention provides a regional cathode protection control method to solve the problem that the current intelligent multichannel potentiostat cannot perform regional cathode protection under the coexistence of multiple operation modes.
The invention provides a regional cathode protection control method which is characterized by comprising the following steps:
initial data acquisition: acquisition of detection point A in an area 1 ～A m Is a self-etching potential of (a);
correlation test: output channel C of potentiostat 1 ～C n According to the set output current, sequentially performing testability operation, performing testability operation on only one output channel at the same time, and collecting a testability operation detection point A of each output channel 1 ～A m And calculating a test potential difference with respect to the self-etching potential;
correlation determination: extracting a test potential difference corresponding to one output channel, multiplying the largest test potential difference with a judgment coefficient to obtain a judgment potential difference, wherein the judgment coefficient is larger than 0 and smaller than 1, selecting the test potential difference larger than the judgment potential difference, setting a corresponding detection point as a correlation detection point of the output channel, and obtaining the correlation detection points corresponding to the other output channels according to the mode;
the system operates: output channel C of potentiostat 1 ～C n All operate according to the operation mode set correspondingly, until reaching the initial operation parameter set;
and (3) operation data acquisition: acquisition of detection point A in an area 1 ～A m Is a power-off potential of (2);
and (3) standard-reaching comparison: will detect point A 1 ～A m Comparing the collected power-off potential with a standard-reaching potential range, and if the power-off potential of all detection points is in the standard-reaching potential range, enabling the potential to reach the standard, and keeping the current state of each output channel of the potentiostat to operate; if the power-off potential of the detection point is outside the standard potential range, the potential is not up toThe standard, then carry on the systematic regulation step;
and (3) system adjustment: output channel C of constant potential instrument 1 ～C n Adjusting, if the current operation mode of the adjusted output channel is a constant power-on potential operation mode, performing a constant power-on mode adjustment step; if the running mode of the current regulated output channel is a constant power-off potential working mode, performing a constant power-off mode adjustment step; if the current operation mode of the regulated output channel is a constant current operation mode, performing a constant current mode adjustment step; after all output channels are regulated, the operation data acquisition steps are started to be sequentially carried out again;
constant power mode adjustment: calculating the power-off potential of the correlation detection point of the output channel which does not reach the standard and the power-on mode potential difference between the closest standard-reaching potential, multiplying the power-on mode potential difference and the power-on adjustment coefficient to obtain power-on analog adjustment quantity, taking the power-on analog adjustment quantity with the smallest absolute value as the power-on potential adjustment quantity, and adjusting the preset power-on potential of the output channel according to the power-on potential adjustment quantity;
constant power off mode adjustment: calculating the power-off mode potential difference between the power-off potential of the correlation detection point of the output channel which does not reach the standard and the nearest power-off mode potential difference between the power-off potential and the nearest standard-reaching potential, multiplying the power-off mode potential difference with a power-off adjustment coefficient to obtain a power-off analog adjustment quantity, taking the power-off analog adjustment quantity with the minimum absolute value as the power-off potential adjustment quantity, and adjusting the preset power-off potential of the output channel according to the power-off potential adjustment quantity;
constant current mode adjustment: the rated output current of the output channel is multiplied by a constant current adjustment coefficient to be used as a current adjustment quantity, and the output channel adjusts the output current according to the current adjustment quantity.
According to the technical scheme, the multi-channel potentiostat is regulated through the three regulation modes, so that each output channel of the multi-channel potentiostat can randomly select a working mode, and the coexistence requirement of multiple operation modes of the cathode protection potentiostat in an actual area is met.
In some of these embodiments, the correlation determination step: the judgment coefficient includes a first judgment coefficient mu 1 And a second determination coefficient mu 2 The largest test potential difference is respectively compared with the first judgment coefficient mu 1 And a second determination coefficient mu 2 Multiplying to obtain a first judgment potential difference and a second judgment potential difference respectively, selecting a test potential difference larger than the first judgment potential difference, setting a corresponding detection point as a high correlation detection point of the output channel, selecting a test potential difference larger than the second judgment potential difference and smaller than the first judgment potential difference, and setting a corresponding detection point as a low correlation detection point of the output channel;
wherein mu 1 ＞μ 2 。
According to the technical scheme, the correlation detection points are further divided into the high correlation detection points and the low correlation detection points, so that the adjustment of the follow-up potentiostat on each output channel is more gentle.
In some of these embodiments, in the constant power mode adjustment step: the energization adjustment coefficient includes a first energization adjustment coefficient alpha 1 And a second energization adjustment coefficient alpha 2 The power-on mode potential difference comprises a high power-on mode potential difference between the power-off potential of the high correlation detection point of which the output channel does not reach the standard and the nearest standard potential, and a low power-on mode potential difference between the power-off potential of the low correlation detection point of which the output channel does not reach the standard and the nearest standard potential, and the power-on analog adjustment quantity comprises the high power-on mode potential difference and a first power-on adjustment coefficient alpha 1 The high-power-on analog adjustment amount and the low-power-on mode potential difference obtained by multiplying them by the second power-on adjustment coefficient alpha 2 The low-power-on analog adjustment amount obtained by multiplication is used as the power-on potential adjustment amount with the minimum absolute value in all the high-power-on analog adjustment amount and the low-power-on analog adjustment amount;
wherein alpha is 1 ＞α 2 。
According to the technical scheme, the power-on simulation adjustment quantity is calculated through the two power-on adjustment coefficients, so that the power-on potential adjustment quantity is as minimum as possible, the amplitude of one-time output adjustment is reduced, and the potential oscillation caused by overlarge adjustment amplitude is avoided.
In some of these embodiments, constant power mode adjustmentThe method comprises the following steps: the power-off adjustment coefficient comprises a first power-off adjustment coefficient beta 1 And a second power-off adjustment coefficient beta 2 The power-off mode potential difference comprises a high power-off mode potential difference between a power-off potential of a high correlation detection point of which the output channel does not reach the standard and a nearest standard potential, and a low power-off mode potential difference between a power-off potential of a low correlation detection point of which the output channel does not reach the standard and a nearest standard potential, and the power-off analog adjustment quantity comprises the high power-off mode potential difference and a first power-off adjustment coefficient beta 1 The high power-off analog adjustment amount and the low power-off mode potential difference obtained by multiplying and the second power-off adjustment coefficient beta 2 The low-power-off analog adjustment quantity obtained by multiplication is used as the power-on potential adjustment quantity with the minimum absolute value in all the high-power-off analog adjustment quantity and the low-power-off analog adjustment quantity;
wherein beta is 1 ＞β 2 。
According to the technical scheme, the power-off simulation adjustment quantity is calculated through the two power-off adjustment coefficients, so that the power-off potential adjustment quantity is as minimum as possible, the amplitude of one-time output adjustment is reduced, and the potential oscillation caused by overlarge adjustment amplitude is avoided.
In some of these embodiments, the constant current mode adjustment step: and calculating the current mode potential difference between the power-off potential of the correlation detection point of the output channel which does not reach the standard and the nearest standard potential, summing all the current mode potential differences to obtain a potential deviation trend value, and adjusting the positive and negative of the current adjustment quantity to be consistent with the positive and negative of the potential deviation trend value.
According to the technical scheme, the adjustment direction is determined through calculation of the integral trend which does not reach the standard, so that more detection points can be adjusted more efficiently to reach the standard.
In some of these embodiments, the system adjustment step: after all output channels are regulated, the polarization duration T is set at intervals 1 And then, starting to run sequentially by the operation data acquisition step again. A step of
According to the technical scheme, after the constant potential rectifier completes one-round output adjustment, data are acquired at intervals, the protected object is guaranteed to be fully polarized, and the acquired outage potential is guaranteed to be more accurate.
In some of these embodiments, the system adjustment step: after all output channels are regulated, if the running time of the constant potential rectifier reaches the set running time T 2 Then, a potential correction step is performed to the detection point A in the potential correction step 1 ～A m And correcting the polarization probe, and starting to sequentially operate again by the system operation step after the potential correction step is finished.
According to the technical scheme, the acquired power-off potential is ensured to be accurate by potential correction.
In some embodiments, the potential correction step is:
output channel C of potentiostat 1 ～C n Simultaneously interrupt output and disconnect connection with the protected object, and collect detection point A in the area while outputting by the terminal 1 ～A m And (3) correcting the polarization probe at the detection point by taking the outage potential difference between the first outage potential and the second outage potential as an outage potential correction amount.
According to the technical scheme, the detection of the real power-off potential is realized by simultaneously powering off the output channels, and correction quantity is determined by calculating the difference value according to the numerical value detected by the polarization probe, so that the correction of the polarization probe is realized.
In some of these embodiments, the detection point a is collected simultaneously in the operation data collection step 1 ～A m Soil resistivity and temperature of (a); in the step of standard comparison, the detection point A is corrected according to the acquired soil resistivity and temperature 1 ～A m Is to detect point A 1 ～A m Comparing the collected power-off potential with a corresponding standard potential range; in the constant power-on mode adjustment step, calculating a power-on mode potential difference between a power-off potential of a correlation detection point of which the output channel does not reach the standard and a nearest standard-reaching potential in a corresponding standard-reaching potential range; in the constant power-off mode adjustment step, the power-off mode potential difference between the power-off potential of the correlation detection point of the output channel not reaching the standard and the nearest standard potential in the corresponding standard potential range is calculated。
The technical scheme determines the corresponding standard potential range for detecting the environmental conditions of the detection points, so that the cathode protection can be more in line with the actual environment, and the cathode protection effect is improved.
In some of these embodiments, in the constant power-on mode adjustment step, the power-on mode potential difference is a difference between a power-off potential of a correlation detection point where the output channel does not reach the standard and is over-protected and a closest standard potential; in the constant power-off mode adjustment step, the power-off mode potential difference is the difference between the power-off potential of the correlation detection point which does not reach the standard and is over-protected by the output channel and the nearest standard-reaching potential; in the constant current mode adjustment step, if the output channel has a correlation detection point which does not reach the standard and is over-protected, the current adjustment amount is negative.
The technical scheme ensures that the output adjustment of the constant potential rectifier can eliminate the over-protection of detection points, avoids the negative influence of the protected object caused by the over-protection, and can also avoid the out-of-control potential automatic adjustment caused by the failure of the sensor.
Based on the technical scheme, the output channels in the embodiment of the invention have three adjustment modes, so that each output channel of the multi-channel potentiostat can adopt any working mode to automatically adjust the output, the good cathodic protection effect is ensured, the requirement of coexistence of multiple operation modes of the actual regional cathodic protection potentiostat is met, and the problem that regional cathodic protection can be carried out under the condition that the current intelligent multi-channel potentiostat cannot coexist in multiple operation modes is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a flow chart illustrating the operation of the zone cathode protection control method of the present invention.
Detailed Description
The technical solutions in the embodiments will be clearly and completely described below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In one exemplary embodiment of the zone cathodic protection control method of the present invention, as shown in fig. 1, the zone cathodic protection control method comprises initial data acquisition, correlation test, correlation determination, system operation, operational data acquisition, compliance comparison, system adjustment, constant-current mode adjustment, constant-power-off mode adjustment.
The underground of the target area is provided with a protected object with a metal structure such as a pipeline, and a plurality of anode beds and an output channel C of a potentiostat are uniformly embedded in the target area for cathodic protection and corrosion prevention of the protected object 1 ～C n All are connected with the corresponding anode ground bed and the protected object. The target area is also uniformly provided with a plurality of test piles for detecting the point A of the target area 1 ～A m And performing potential detection.
Cathodic protection is carried out on the target area, initial data acquisition is carried out, and detection points A in the target area are acquired through each test pile 1 ～A m Is a self-etching potential of (a). Correlation test is carried out, and an output channel C of the potentiostat is used for 1 ～C n Sequentially performing testability operation according to the set output current, stopping operation of one output channel when the testability operation of the output channel reaches the set duration, starting testability operation of the next output channel, namely, only performing testability operation of one output channel at the same time, and collecting detection points A when the testability operation of each output channel reaches the set duration 1 ～A m And calculates the test potential difference with respect to the self-etching potential. Performing correlation determination, extracting a test potential difference corresponding to an output channel, multiplying the largest test potential difference with a determination coefficient to obtain a determination potential difference, selecting a test potential difference larger than the determination potential difference with a determination coefficient larger than 0 and smaller than 1, and setting the corresponding detection point as the correlation detection of the output channelAnd the rest output channels obtain correlation detection points corresponding to the measurement points according to the mode. The system is operated, and the output channel C of the potentiostat 1 ～C n All operate according to the operation mode that is set up correspondingly, until reaching the initial operation parameter that presumes, the initial operation parameter includes presetting the energizing potential, presetting the power-off potential and presetting the output current, when the output channel adopts the working mode of the constant energizing potential, the initial operation parameter is presetting the energizing potential; when the output channel adopts a constant power-off potential working mode, the initial operation parameters are preset power-off potential; when the output channel adopts a constant current working mode, the initial operation parameter is preset output current. Collecting operation data, and collecting detection point A in the region 1 ～A m Is used for the power-off potential of the battery. Comparing the detected points A to reach the standard 1 ～A m Comparing the collected power-off potential with a standard-reaching potential range, and if the power-off potential of all detection points is in the standard-reaching potential range, enabling the potential to reach the standard, and keeping the current state of each output channel of the potentiostat to operate; and if the power-off potential of the detection point is out of the standard potential range and the potential is not standard, performing a system adjustment step. System adjustment is carried out, and the output channels C of the potentiostat are sequentially subjected to 1 ～C n Adjusting, if the current operation mode of the adjusted output channel is a constant power-on potential operation mode, performing a constant power-on mode adjustment step; if the running mode of the current regulated output channel is a constant power-off potential working mode, performing a constant power-off mode adjustment step; if the current operation mode of the regulated output channel is a constant current operation mode, performing a constant current mode adjustment step; and after all output channels are regulated, the operation data acquisition steps are started to be sequentially carried out again.
When the current output channel is subjected to constant power-on mode adjustment, calculating power-off mode potential difference between the power-off potential of the correlation detection point of the output channel, which does not reach the standard, and the nearest power-on mode potential difference between the power-off potential and the standard-reaching potential, multiplying the power-on mode potential difference by power-on adjustment coefficients to obtain power-on analog adjustment quantity, taking the power-on analog adjustment quantity with the smallest absolute value as the power-on potential adjustment quantity, and adjusting the preset power-on potential of the output channel according to the power-on potential adjustment quantity.
When the current output channel is subjected to constant power-off mode adjustment, calculating a power-off mode potential difference between the power-off potential of the correlation detection point of the output channel, which does not reach the standard, and the closest power-off mode potential difference between the power-off potential of the correlation detection point of the output channel, which reaches the standard, and multiplying the power-off mode potential difference by a power-off adjustment coefficient to obtain a power-off analog adjustment quantity, taking the power-off analog adjustment quantity with the minimum absolute value as the power-off potential adjustment quantity, and adjusting the preset power-off potential of the output channel according to the power-off potential adjustment quantity.
When the current output channel is subjected to constant current mode adjustment, the rated output current of the output channel is multiplied by a constant current adjustment coefficient to be used as a current adjustment quantity, and the output channel adjusts the output current according to the current adjustment quantity.
In the above-mentioned exemplary embodiment, the regional cathodic protection control method can adopt a corresponding output adjustment mode for each output channel, and the output adjustment mode can cover three working modes of constant-current potential, constant-power potential and constant current, so that each output channel of the multi-channel potentiostat can adopt any working mode to automatically adjust output, the cathodic protection effect is good, the requirement of coexistence of multiple operation modes of the actual regional cathodic protection potentiostat is met, and the problem that regional cathodic protection is carried out under the condition that the current intelligent multi-channel potentiostat cannot coexist in multiple operation modes is solved.
In addition, when constant-current mode adjustment and constant-current mode adjustment are carried out, absolute values are adopted to be small as adjustment amounts, the step length of single adjustment of an output channel is reduced, the potential of a substandard detection point is gradually close to and enters a reach range, potential fluctuation is avoided being overlarge due to overlarge output adjustment amplitude, and the potential reaches a standard more stably and efficiently.
In some embodiments, where a correlation determination is made, the determination coefficients include a first determination coefficient μ 1 And a second determination coefficient mu 2 . Wherein mu 1 ＞μ 2 . Extracting a test potential difference corresponding to an output channel, and respectively comparing the largest test potential difference with the first determination coefficient mu 1 And a second determination coefficient mu 2 MultiplicationThus, a first judgment potential difference and a second judgment potential difference are respectively obtained, a test potential difference larger than the first judgment potential difference in the test potential differences of the output channels is selected, and corresponding detection points are set as high-correlation detection points of the output channels; selecting the test potential difference of the output channel, wherein the test potential difference is larger than the second judgment potential difference and smaller than the first judgment potential difference, and setting the corresponding detection point as the low correlation detection point of the output channel. And the other output channels are respectively used for obtaining corresponding high-correlation detection points and low-correlation detection points according to the mode.
By setting two judging coefficients, the correlation detection points are further subdivided into high correlation detection points and low correlation detection points, and conditions are provided for the follow-up finer output adjustment of each output channel.
In some embodiments, the power-on adjustment coefficient includes a first power-on adjustment coefficient α when the output channel is subjected to the constant power-on mode adjustment step 1 And a second energization adjustment coefficient alpha 2 . Wherein alpha is 1 ＞α 2 . The power-on mode potential difference comprises a high power-on mode potential difference between the power-off potential of the high correlation detection point of which the output channel does not reach the standard and the nearest standard potential, and a low power-on mode potential difference between the power-off potential of the low correlation detection point of which the output channel does not reach the standard and the nearest standard potential, and the power-on analog adjustment quantity comprises the high power-on mode potential difference and a first power-on adjustment coefficient alpha 1 The high-power-on analog adjustment amount and the low-power-on mode potential difference obtained by multiplying them by the second power-on adjustment coefficient alpha 2 The low-energization analog adjustment amount obtained by the multiplication has the smallest absolute value of all the high-energization analog adjustment amount and the low-energization analog adjustment amount as the energization potential adjustment amount.
In the detection points of potential failure, the potential difference of the high power-on mode corresponding to the high correlation detection points and the first power-on adjustment coefficient alpha with larger value are used for 1 Multiplying the low power-on mode potential difference corresponding to the low correlation detection point by a second power-on adjustment coefficient alpha with smaller value 2 Multiplication ensures that the finally obtained power-on potential adjustment amount is smaller, and furtherThe step length of each output adjustment of the output channel is reduced, so that the substandard potential is more gentle and is close to the substandard potential range, the potential fluctuation after adjustment is smaller, and the potential is more efficient after reaching the standard. To further ensure that the adjustment step is small, 0 < alpha 1 ＜1，0＜α 2 ＜0.1。
In some embodiments, the power-off adjustment coefficient includes a first power-off adjustment coefficient β when the output channel performs the constant power-off mode adjustment step 1 And a second power-off adjustment coefficient beta 2 . Wherein beta is 1 ＞β 2 . The power-off mode potential difference comprises a high power-off mode potential difference between a power-off potential of a high correlation detection point of the output channel which does not reach the standard and a nearest standard potential, and a low power-off mode potential difference between a power-off potential of a low correlation detection point of the output channel which does not reach the standard and a nearest standard potential, and the power-off analog adjustment quantity comprises the high power-off mode potential difference and a first power-off adjustment coefficient beta 1 The high power-off analog adjustment amount and the low power-off mode potential difference obtained by multiplying and the second power-off adjustment coefficient beta 2 The low-power-off analog adjustment amount obtained by multiplication is used as the power-on potential adjustment amount with the smallest absolute value in all the high-power-off analog adjustment amount and the low-power-off analog adjustment amount.
In the detection points of potential substandard, the high power-off mode potential difference corresponding to the high correlation detection points and the first power-off adjustment coefficient beta with larger value are used for 1 Multiplying the low power-off mode potential difference corresponding to the low correlation detection point by a second power-off adjustment coefficient beta with smaller value 2 The multiplication ensures that the finally obtained power-off potential adjustment quantity is smaller, further reduces the step length of each output adjustment of the output channel, ensures that the substandard potential is more gentle and is close to the substandard potential range, the potential fluctuation is smaller after adjustment, and the potential is more efficient after reaching the standard. To further ensure smaller adjustment step size, 0 < beta 1 ＜1，0＜β 2 ＜0.1。
In some embodiments, when the output channel performs the constant current mode adjustment step, a current mode potential difference between the power-off potential of the correlation detection point of the output channel, which does not reach the standard, and the nearest standard potential is calculated, all the current mode potential differences are summed to obtain a potential shift trend value, and the positive and negative polarities of the current adjustment amount are adjusted to be consistent with the positive and negative polarities of the potential shift trend value.
And the output channel of the constant current working mode is adjusted, and the adjusting step length is fixed, so that the direction of output adjustment is determined by determining whether all potential differences are wholly biased positive or biased negative, more detection points can be close to and enter the standard potential range, and the standard potential efficiency is improved.
In some embodiments, when the system adjustment step is performed, after all output channels complete output adjustment in turn, the polarization duration T is set at intervals 1 And then, starting to run sequentially by the operation data acquisition step again. Duration of interval polarization T 1 Ensuring that the protected object is fully polarized, thereby ensuring that the power-off potential data acquired by each detection point is accurate when the operation data is acquired, and the polarization duration T 1 Can be set to 5min.
In some embodiments, when the system adjustment step is performed, after all output channels complete adjustment output in turn, if the operation duration of the potentiostat reaches the set operation duration T at this time 2 Then, a potential correction step is performed to the detection point A in the potential correction step 1 ～A m And correcting the polarization probe, and starting to sequentially operate again by the system operation step after the potential correction step is finished.
And carrying out potential correction on the polarization probes of the test piles at each detection point through a potential correction step, thereby ensuring the accuracy of the measured outage potential and avoiding measurement errors caused by ageing of the polarization probes. Duration of operation T 2 Can be set to be 1 month, and the influence of frequent correction on the adjustment work of the potentiostat is avoided.
In some embodiments, the potential correction step is specifically: output channel C of potentiostat 1 ～C n While interrupting the output and all output channels simultaneously disconnect them from the protected object. While each output channel terminal outputs interruption and disconnection, a detection point A in the acquisition area 1 ～A m First power-off potential of protected object and detection point A 1 ～A m And (3) the second power-off potential of the test piece in the upper polarization probe, and the power-off potential difference between the first power-off potential and the second power-off potential is used as a power-off potential correction amount to correct the polarization probe at the detection point. When the output terminal is connected and disconnected, the measured first power-off potential is the actual power-off potential of the current protected object, the power-off potential measured by the polarization probe is the power-off potential on the test piece, and the integrity and reliability of the test piece cannot be completely ensured, so that the power-off potential measured by the polarization probe of each subsequent detection point is corrected through the power-off potential difference of the corresponding detection point, the collected power-off potential is ensured to be more accurate, and a more accurate adjusting basis is provided for the output adjustment of the subsequent potentiostat.
In some of these embodiments, the detection point a is collected simultaneously with the running data collection step 1 ～A m Soil resistivity and temperature of (c). Correcting the detection point A according to the acquired soil resistivity and temperature when the standard-reaching comparison step is carried out 1 ～A m Is to detect point A 1 ～A m And comparing the acquired power-off potential with the corresponding corrected standard potential range. And when the constant power-on mode adjustment step is carried out, calculating the power-off potential of the correlation detection point of the output channel, which does not reach the standard, and the power-on mode potential difference between the closest standard-reaching potential in the standard-reaching potential range after corresponding correction. And in the constant power-off mode adjustment step, calculating the power-off mode potential difference between the power-off potential of the correlation detection point of which the output channel does not reach the standard and the closest standard-reaching potential in the standard-reaching potential range after corresponding correction.
Since in the prior art, the determination of the standard reaching range of the potential is related to the resistivity and the temperature of the soil. In order to improve the effect of cathodic protection, the soil resistivity and the temperature of each detection point are collected, the potential standard reaching range of each detection point is set according to the collected soil resistivity and the temperature, then when standard reaching comparison is carried out and when output adjustment is carried out, the power-off potential of each detection point is compared with the standard reaching potential range on the corresponding detection point, potential difference calculation is carried out on the power-off potential of each detection point which does not reach the standard and the standard reaching potential range on the corresponding detection point, so that whether the potential reaches the standard or not is judged more accurately, the output adjustment basis of a potentiostat is more accurate, and the power-off potential of each detection point after adjustment can enter the corresponding potential standard reaching range, thereby ensuring that the potential of each detection point can meet the optimal cathodic protection effect.
In some of these embodiments, at the constant power mode adjustment step, the power mode potential difference is the difference between the power-off potential of the correlation detection point that the output channel does not meet and that is over-protected and the closest meeting potential. In the constant power-off mode adjustment step, the power-off mode potential difference is the difference between the power-off potential of the correlation detection point of which the output channel does not reach the standard and is over-protected and the nearest standard-reaching potential. In the constant current mode adjustment step, if the output channel has a correlation detection point which does not reach the standard and is over-protected, the current adjustment amount is negative.
The power-off potential of the detection point is lower or higher than the standard reaching range, and the detection point is over-protected or under-protected. In the constant power-on mode adjustment step and the constant power-off mode adjustment step, adjustment quantity is calculated through the over-protection correlation detection points, so that when the over-protection of the detection points occurs, the output of the constant potential rectifier is adjusted to be reduced, and the over-protection of the detection points is eliminated. In the constant current mode adjustment step, when the over-protection occurs at the correlation detection point, the adjustment quantity which is negative is adopted to adjust the output of the constant potential rectifier to be reduced so as to eliminate the over-protection of the detection point. Through the adjustment mode, the over-protection of the detection point is avoided, the negative influence caused by the over-protection is prevented, and meanwhile, the automatic potential adjustment out of control caused by the failure of the sensor can be avoided.
Finally, it should be noted that: in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (10)
1. A regional cathodic protection control method, comprising the steps of:
initial data acquisition: acquisition of detection point A in an area 1 ～A m Is a self-etching potential of (a);
correlation test: output channel C of potentiostat 1 ～C n According to the set output current, sequentially performing testability operation, performing testability operation on only one output channel at the same time, and collecting a testability operation detection point A of each output channel 1 ～A m And calculating a test potential difference with respect to the self-etching potential;
correlation determination: extracting a test potential difference corresponding to one output channel, multiplying the largest test potential difference with a judgment coefficient to obtain a judgment potential difference, wherein the judgment coefficient is larger than 0 and smaller than 1, selecting the test potential difference larger than the judgment potential difference, setting a corresponding detection point as a correlation detection point of the output channel, and obtaining the correlation detection points corresponding to the other output channels according to the mode;
the system operates: output channel C of potentiostat 1 ～C n All operate according to the operation mode set correspondingly, until reaching the initial operation parameter set;
and (3) operation data acquisition: acquisition of detection point A in an area 1 ～A m Is a power-off potential of (2);
and (3) standard-reaching comparison: will detect point A 1 ～A m Comparing the collected power-off potential with a standard-reaching potential range, and if the power-off potential of all detection points is in the standard-reaching potential range, enabling the potential to reach the standard, and keeping the current state of each output channel of the potentiostat to operate; if the power-off potential of the detection point is out of the standard potential range, the potential is not standard, and then a system adjusting step is carried out;
and (3) system adjustment: output channel C of constant potential instrument 1 ～C n Adjusting, if the current operation mode of the adjusted output channel is a constant power-on potential operation mode, performing a constant power-on mode adjustment step; if the running mode of the current regulated output channel is a constant power-off potential working mode, performing a constant power-off mode adjustment step; if the current operation mode of the regulated output channel is a constant current operation mode, performing a constant current mode adjustment step; after all output channels are regulated, the operation data acquisition steps are started to be sequentially carried out again;
constant power mode adjustment: calculating the power-off potential of the correlation detection point of the output channel which does not reach the standard and the power-on mode potential difference between the closest standard-reaching potential, multiplying the power-on mode potential difference and the power-on adjustment coefficient to obtain power-on analog adjustment quantity, taking the power-on analog adjustment quantity with the smallest absolute value as the power-on potential adjustment quantity, and adjusting the preset power-on potential of the output channel according to the power-on potential adjustment quantity;
constant power off mode adjustment: calculating the power-off mode potential difference between the power-off potential of the correlation detection point of the output channel which does not reach the standard and the nearest power-off mode potential difference between the power-off potential and the nearest standard-reaching potential, multiplying the power-off mode potential difference with a power-off adjustment coefficient to obtain a power-off analog adjustment quantity, taking the power-off analog adjustment quantity with the minimum absolute value as the power-off potential adjustment quantity, and adjusting the preset power-off potential of the output channel according to the power-off potential adjustment quantity;
constant current mode adjustment: the rated output current of the output channel is multiplied by a constant current adjustment coefficient to be used as a current adjustment quantity, and the output channel adjusts the output current according to the current adjustment quantity.
2. The regional cathodic protection control method of claim 1 wherein in the correlation determination step: the judgment coefficient includes a first judgment coefficient mu 1 And a second determination coefficient mu 2 The largest test potential difference is respectively compared with the first judgment coefficient mu 1 And a second determination coefficient mu 2 Multiplying to obtain a first judgment potential difference and a second judgment potential difference, respectively, and selecting a value larger than the first judgment potential differenceSetting the corresponding detection point as the high correlation detection point of the output channel, selecting the test potential difference which is larger than the second judgment potential difference and smaller than the first judgment potential difference, and setting the corresponding detection point as the low correlation detection point of the output channel;
wherein mu 1 ＞μ 2 。
3. The area cathodic protection control method of claim 2 wherein in the constant energization mode adjusting step: the energization adjustment coefficient includes a first energization adjustment coefficient alpha 1 And a second energization adjustment coefficient alpha 2 The power-on mode potential difference comprises a high power-on mode potential difference between the power-off potential of the high correlation detection point of which the output channel does not reach the standard and the nearest standard potential, and a low power-on mode potential difference between the power-off potential of the low correlation detection point of which the output channel does not reach the standard and the nearest standard potential, and the power-on analog adjustment quantity comprises the high power-on mode potential difference and a first power-on adjustment coefficient alpha 1 The high-power-on analog adjustment amount and the low-power-on mode potential difference obtained by multiplying them by the second power-on adjustment coefficient alpha 2 The low-power-on analog adjustment amount obtained by multiplication is used as the power-on potential adjustment amount with the minimum absolute value in all the high-power-on analog adjustment amount and the low-power-on analog adjustment amount;
wherein alpha is 1 ＞α 2 。
4. The area cathodic protection control method of claim 2 wherein in the constant power-off mode adjustment step: the power-off adjustment coefficient comprises a first power-off adjustment coefficient beta 1 And a second power-off adjustment coefficient beta 2 The power-off mode potential difference comprises a high power-off mode potential difference between a power-off potential of a high correlation detection point of which the output channel does not reach the standard and a nearest standard potential, and a low power-off mode potential difference between a power-off potential of a low correlation detection point of which the output channel does not reach the standard and a nearest standard potential, and the power-off analog adjustment quantity comprises the high power-off mode potential difference and a first power-off adjustment coefficient beta 1 The high power-off analog adjustment amount and the low power-off mode potential difference obtained by multiplying and the second power-off adjustment coefficient beta 2 The low-power-off analog adjustment quantity obtained by multiplication is used as the power-on potential adjustment quantity with the minimum absolute value in all the high-power-off analog adjustment quantity and the low-power-off analog adjustment quantity;
wherein beta is 1 ＞β 2 。
5. The regional cathodic protection control method of claim 1 wherein in the constant current mode adjusting step: and calculating the current mode potential difference between the power-off potential of the correlation detection point of the output channel which does not reach the standard and the nearest standard potential, summing all the current mode potential differences to obtain a potential deviation trend value, and adjusting the positive and negative of the current adjustment quantity to be consistent with the positive and negative of the potential deviation trend value.
6. The regional cathodic protection control method of any one of claims 1 to 5 wherein in the system adjusting step: after all output channels are regulated, the polarization duration T is set at intervals 1 And then, starting to run sequentially by the operation data acquisition step again.
7. The regional cathodic protection control method of any one of claims 1 to 5 wherein in the system adjusting step: after all output channels are regulated, if the running time of the constant potential rectifier reaches the set running time T 2 Then, a potential correction step is performed to the detection point A in the potential correction step 1 ～A m And correcting the polarization probe, and starting to sequentially operate again by the system operation step after the potential correction step is finished.
8. The regional cathodic protection control method of claim 7 wherein the potential modification step is:
output channel C of potentiostat 1 ～C n Simultaneously interrupt output and disconnect the output from the protected object, and simultaneously collect the outputIn-area inspection point A 1 ～A m And (3) correcting the polarization probe at the detection point by taking the outage potential difference between the first outage potential and the second outage potential as an outage potential correction amount.
9. The method according to claim 1, wherein in the operation data acquisition step, the detection point a is simultaneously acquired 1 ～A m Soil resistivity and temperature of (a); in the step of standard comparison, the detection point A is corrected according to the acquired soil resistivity and temperature 1 ～A m Is to detect point A 1 ～A m Comparing the collected power-off potential with a corresponding standard potential range; in the constant power-on mode adjustment step, calculating a power-on mode potential difference between a power-off potential of a correlation detection point of which the output channel does not reach the standard and a nearest standard-reaching potential in a corresponding standard-reaching potential range; in the constant power-off mode adjustment step, a power-off mode potential difference between a power-off potential of a correlation detection point of which the output channel does not reach the standard and a closest standard-reaching potential in a corresponding standard-reaching potential range is calculated.
10. The regional cathodic protection control method of any one of claims 1 to 5 wherein in the constant energization mode adjustment step, the energization mode potential difference is the difference between the power-off potential of the correlation detection point at which the output channel does not reach the standard and the oversrotection and the nearest standard potential; in the constant power-off mode adjustment step, the power-off mode potential difference is the difference between the power-off potential of the correlation detection point which does not reach the standard and is over-protected by the output channel and the nearest standard-reaching potential; in the constant current mode adjustment step, if the output channel has a correlation detection point which does not reach the standard and is over-protected, the current adjustment amount is negative.
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