CN110702599A - Multi-electrode top corrosion monitoring sensor, top corrosion monitoring experiment system and monitoring method - Google Patents
Multi-electrode top corrosion monitoring sensor, top corrosion monitoring experiment system and monitoring method Download PDFInfo
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Abstract
The invention discloses a multi-electrode top corrosion monitoring sensor, a top corrosion monitoring experiment system and a monitoring method. The multi-electrode top corrosion monitoring sensor comprises a working electrode element and a reference electrode element which are in direct contact with a corrosion environment to be detected, and the top corrosion monitoring experiment system comprises a heating and heat-insulating system, a circulating cooling water refrigerating system, an experiment device capable of simulating the top corrosion environment, a watertight camera, a multi-electrode top corrosion sensor, a multi-channel corrosion monitor and a signal acquisition control system. The circulating cooling water refrigeration system controls the on-off of a compressor switch through a temperature probe signal so as to control the temperature of cooling water. The invention can realize continuous monitoring of the top corrosion process, and obtains key factors influencing the top corrosion problem, such as the distribution position of liquid drops, the dropping period and the like in the top corrosion problem through the galvanic couple current and the coupling potential of each channel.
Description
Technical Field
The invention relates to the field of top corrosion monitoring, in particular to a multi-electrode top corrosion monitoring sensor, a top corrosion monitoring experiment system and a monitoring method.
Background
In recent years, with the rapid development of the petroleum industry in China, the problem of corrosion of the inner wall of a submarine oil and gas pipeline is widely concerned. Wherein, when the oil gas pipeline has larger temperature difference with the external environment, the water vapor and the CO2、H2Volatile media such as S, organic acids and the like can be condensed at the top of the pipeline with lower temperature, and further the problem of top corrosion is caused. Although corrosion inhibitors are typically added to pipelines to slow the corrosion rate of the inner wall of the pipeline, they are generally not volatile and do not effectively protect the top area of the pipeline, which in some cases is far more harmful than others. Therefore, the effective monitoring of the corrosion condition of the top of the pipeline has important significance on the safety of the pipeline.
Two analytical methods, physical and electrochemical, are commonly used to study the corrosion problem. The corrosive environment of the top corrosion is condensed liquid drops with tiny volume, and the appearance positions of the liquid drops have certain randomness, so that an effective counter electrode and a reference electrode are difficult to arrange to construct a three-electrode system. I.e., conventional electrochemical methods failed in the study of the overhead corrosion problem. Therefore, most of the scholars at home and abroad use a physical method to study the top corrosion, and by combining a hanging piece weight loss method with surface analysis means such as an optical microscope and a scanning electron microscope, the major factors influencing the top corrosion, such as CO2Partial pressure, temperature, gas flow rate, water condensation rate, and CH3The concentration of COOH, etc. were investigated. However, due to the limitations of the weight loss method, continuous monitoring of the top corrosion cannot be achieved. In order to obtain a more detailed corrosion development state, the test piece needs to be taken out frequently for weighing, the operation is complex, and certain errors are brought. In addition, the randomness of the distribution of the condensed liquid drops determines that the top corrosion is a local corrosion phenomenon, and the weight loss method can only obtain the average corrosion rate and cannot obtain accurate local corrosion information. Therefore, it is necessary to continuously monitor the top corrosion phenomenon and to determine the residence time and distribution position of the condensed liquid droplets for the top corrosion problem. Therefore, the invention provides a novel top corrosion monitoring sensor which can effectively solve the problemsThe method lays a certain foundation for further research on the top corrosion.
Disclosure of Invention
In light of the above-mentioned technical problems, a multi-electrode top corrosion monitoring sensor, a top corrosion monitoring experiment system and a monitoring method are provided. The invention can monitor the development condition of the top corrosion in real time by using the top corrosion monitoring sensor, and obtain the important information which influences the development of the top corrosion, such as the residence time and the distribution position of condensed liquid drops. The technical means adopted by the invention are as follows:
the utility model provides a multi-electrode top corrosion monitoring sensor, includes outer tube, working electrode component, reference electrode component and insulating part, working electrode component and reference electrode component size are the same and all fix on the outer tube, working electrode component and reference electrode component's working face and the corrosive environment direct contact that awaits measuring, and the two all uses except the working face the insulating part cladding, working electrode component is square pipeline steel test block, reference electrode component is the stainless steel test block.
Further, the working electrode elements and the reference electrode elements are arranged according to a 3 x 3 array, 8 working electrode elements surround the periphery, and 1 reference electrode element is arranged in the center.
Furthermore, the size, the thickness and the distance between adjacent elements of the working surfaces of the working electrode element and the reference electrode element are preset values suitable for the environment to be detected, wherein the side length of the test piece is smaller than the diameter of a liquid drop formed in a corrosive environment.
The invention also provides a top corrosion monitoring experiment system, which comprises the multi-electrode top corrosion sensor, an experiment device capable of simulating top corrosion, a temperature control system and a multi-channel corrosion monitor, wherein the experiment device capable of simulating top corrosion is used for simulating top corrosion and comprises a top cooling water tank, an upper end cover, a glass container, a base and a sensor clamp, and the top cooling water tank is made of stainless steel and comprises a water inlet and a water outlet; the top cooling water tank is located on the upper end cover in a circular bead matching mode, the sensor clamp is arranged between the cooling water tank and the upper end cover, the glass container is arranged between the upper end cover and the base in a circular bead matching mode, through holes are formed in four corners of the upper end cover and the base, the glass container is fastened to achieve a sealing effect through the matching of the nut and the screw, the temperature control system is used for controlling the water in the top cooling water tank and the glass container to be at a preset temperature, the multi-electrode top corrosion sensor is detachably connected to the experimental device and comprises long leads connected to the corresponding surfaces of the working surfaces of the electrode elements, the multi-electrode top corrosion sensor is connected with a multi-channel corrosion monitor, and the multi-channel corrosion monitor is used for measuring galvanic couple current and coupling potential according to feedback of the multi-electrode top corrosion sensor.
Furthermore, the temperature control system comprises a circulating cooling water control system for keeping the top cooling water tank at a preset temperature and a water area constant temperature device for keeping the glass container at a preset temperature, the preset temperature of the liquid in the top cooling water tank is lower than the preset temperature of the liquid in the bottom glass container, and the circulating cooling water control system is connected to the water inlet and the water outlet.
Further, the circulating cooling water control system comprises a water storage tank, a water pump A, a water pump B, PVC, a compressor, a temperature probe and a temperature control switch, wherein the water storage tank stores cooling water; the water pump A is used for forming a closed loop with the compressor through a PVC hose to circularly refrigerate cooling water in the water storage tank; the water pump B is used for forming a closed loop with the top cooling water tank through a PVC hose, and circulating low-temperature cooling water through the top cooling water tank to provide a top low-temperature environment; the temperature probe is arranged in cooling water and is connected with the temperature control switch; the compressor power is connected with the temperature control switch and used for controlling the on-off of the compressor through temperature change so as to keep the temperature of the cooling water constant.
Furthermore, a zero resistance current meter and a voltmeter are arranged in the multi-channel corrosion monitor.
And the signal acquisition control system is connected with the multi-channel corrosion monitor and is used for acquiring data measured by the multi-channel corrosion monitor and controlling the on-off and the measurement period of the multi-channel corrosion monitor.
The invention also provides a monitoring method of the top corrosion monitoring experiment system, which comprises the following steps:
s01: installing an array electrode sensor in a sensor clamp and placing the sensor clamp in a top corrosion experimental device;
s02: leading out 9 long wires at the back of the sensor through a sensor clamp and a threading hole on the side wall of an upper end cover, and connecting the wires with a multi-channel corrosion monitoring sensor, wherein 8 pipeline steel elements are connected with a working electrode interface, and 1 stainless steel element is connected with a reference electrode interface;
s03: controlling a top cooling water tank to keep a constant preset temperature through a circulating cooling water control system, and controlling a solution in a bottom glass container to keep the constant preset temperature through a water area constant temperature device, wherein the preset temperature of liquid in the top cooling water tank is lower than the preset temperature of liquid in the bottom glass container;
s04: continuously measuring couple current among 8 pipeline steel test pieces and coupling potential of the 8 pipeline steel test pieces relative to the stainless steel test piece through a signal acquisition control system, recording data and storing documents;
s05: analyzing and processing the data acquired by the signal acquisition control system to obtain the respective average corrosion depths of the corrosion elements;
s06: and comparing the characteristics of the couple current and the coupling potential to obtain the distribution position of the liquid drops and the dropping period of the liquid drops.
The invention has the following advantages:
1. the invention can realize continuous monitoring of the top corrosion problem;
2. the invention can obtain accurate drop period;
3. the invention can obtain the distribution condition of the top liquid drops, distinguish the corrosion rate of the liquid drop attachment area from the corrosion rate of other areas and obtain more real top corrosion information.
Based on the reasons, the invention can be widely popularized in the field of top corrosion monitoring.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a top corrosion monitoring experiment system according to an embodiment of the present invention;
fig. 2 is a front view cross-section of fig. 1.
FIG. 3 is a schematic view of a recirculating cooling water system in accordance with an embodiment of the present invention.
FIG. 4 is a schematic diagram of a multi-electrode top corrosion monitoring sensor constructed in accordance with an embodiment of the present invention.
FIG. 5 is a schematic circuit diagram of a corrosion monitoring system constructed in accordance with an embodiment of the present invention.
In the figure: 1: top cooling water tank, 2: upper end cap, 3: glass container, 4: a base, 5: sensor clamp, 6: nut, 7: stud, 8: water outlet, 9: water inlet, 10: air intake holes, 11: air outlet hole, 12: threading hole a, 13: threading hole B, 14: sensor mounting hole, 21: water storage tank, 22: compressor, 23: water pump a, 24: temperature probe, 25: water pumps B, 26: inlet tube a, 27: water outlet pipe A, 28: inlet pipe B, 29: water outlet pipe B, 30: a temperature control switch; 31: outer tube, 32: working electrode element, 33: reference electrode element, 34: epoxy resin, 41: a multi-channel corrosion monitor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 4, the present embodiment discloses a multi-electrode top corrosion monitoring sensor, which includes an outer tube 31, a working electrode element 32, a reference electrode element 33, and an insulating member, wherein the working electrode element 32 and the reference electrode element 33 have the same size and are both fixed on the outer tube 31, working surfaces of the working electrode element 32 and the reference electrode element 33 are in direct contact with a corrosion environment to be measured, and both are coated with the insulating member except for the working surfaces, the working electrode element 32 is a square pipeline steel test piece, and the reference electrode element 33 is a stainless steel test piece. The working electrode elements 32 and the reference electrode elements 33 are arranged in a 3 × 3 array, 8 working electrode elements 32 surround the periphery, and 1 reference electrode element 33 is arranged in the center. In this embodiment, the insulating member is made of epoxy resin 34, and the outer tube 31 is made of acrylic material and serves as a sensor mold. The surface parts of the areas of the 9 test pieces except the working surface are covered with epoxy resin 34 to ensure the electrical insulation of the non-corrosive surface. As shown in fig. 5, all the working electrode elements 32 are connected to a relay switch and coupled to the a/D converter through 8 zero resistance ammeters. The measurement period is controlled by the signal acquisition system, and all relay switches are closed during measurement, so that all working electrode elements 32 are kept in coupling connection, and the galvanic current among 8 corrosion elements is measured simultaneously. The reference electrode member 33 was connected through an A/D converter at the same time, and the coupling potential of the entire 8 working elements was monitored.
As a preferred embodiment, the size, thickness, and distance between adjacent elements of the working surface of the working electrode element 32 and the reference electrode element 33 are preset values adapted to the environment to be detected, wherein the side length of the test piece is smaller than the diameter of the droplet formed in the corrosive environment, in the actual test process, the thickness of 9 test pieces is reduced as much as possible to achieve a better heat transfer effect, and the distance between adjacent test pieces is reduced as much as possible while the 9 test pieces are ensured to be insulated from each other.
As shown in fig. 1 to 3, the embodiment further discloses a top corrosion monitoring experiment system using the multi-electrode top corrosion monitoring sensor, which includes the multi-electrode top corrosion sensor, an experiment device capable of simulating top corrosion, a temperature control system, and a multi-channel corrosion monitor 41, wherein the experiment device capable of simulating top corrosion is used for simulating top corrosion, and includes a top cooling water tank 1, an upper end cover 2, a glass container 3, a base 4, and a sensor clamp 5, and the top cooling water tank 1 is made of stainless steel and includes a water inlet 9 and a water outlet 8; the top cooling water tank 1 is located on the upper end cover 2 in a shoulder matching mode, the sensor clamp 5 is arranged between the cooling water tank 1 and the upper end cover 2, the glass container 3 is arranged between the upper end cover 2 and the base 4 in a shoulder matching mode, and the upper end cover 2 and the top cooling water tank 1 are sealed with an O ring through threads to prevent cooling water from overflowing; two sides of the upper end cover 2 are provided with an air inlet hole 10, an air outlet hole 11, a threading hole A12 and a threading hole B13, and the threading holes and the sensor mounting holes 14 are positioned on the surface of the sensor clamp 5 through thread sealing; the four corners of the upper end cover 2 and the base 4 are provided with through holes, the fastening glass container 3 achieves a sealing effect through the cooperation of the nuts 6 and the screw rods 7, the temperature control system is used for controlling the water in the top cooling water tank 1 and the glass container 3 to be at a preset temperature, the multi-electrode top corrosion sensor is detachably connected to the sensor clamp 5, the multi-electrode top corrosion sensor comprises long leads connected to the corresponding surface of the working surface of each electrode element, the multi-electrode top corrosion sensor is connected with the multi-channel corrosion monitor 41, and the multi-channel corrosion monitor 41 is used for measuring galvanic current and coupling potential according to the feedback of the multi-electrode top corrosion sensor. In other practical modes, the internal environment can be further observed by arranging a watertight camera.
In this embodiment, the cooling water tank 1 is made of stainless steel, and the upper end cap 2, the base 4 and the sensor clamp 5 are made of teflon.
In a preferred embodiment, the temperature control system comprises a circulating cooling water control system for keeping the top cooling water tank 1 at a preset temperature and a water area constant temperature device for keeping the glass container 3 at a preset temperature, the preset temperature of the liquid in the top cooling water tank 1 is lower than the preset temperature of the liquid in the bottom glass container 3, and the circulating cooling water control system is connected to the water inlet 9 and the water outlet 8.
In a preferred embodiment, the circulating cooling water control system comprises a water storage tank 21, a water pump A23, a water pump B25, a PVC water pipe, a compressor 22, a temperature probe 24 and a temperature control switch 30, wherein the water storage tank 21 stores cooling water; the water pump A23 is used for forming a closed loop with the compressor 22 through a water inlet pipe A26, a water outlet pipe A27 and for circularly refrigerating cooling water in the water storage tank 21, wherein the water inlet pipe A26 and the water outlet pipe A27 are water inlet pipes and water outlet pipes relative to the compressor 22; the water pump B25 is used for forming a closed loop with the top cooling water tank 1 through a water inlet pipe B28 and a water outlet pipe B29, low-temperature cooling water is circulated through the top cooling water tank 1, and a top low-temperature environment is provided, wherein the water inlet pipe B28 and the water outlet pipe B29 are water inlet pipes and water outlet pipes relative to the top cooling water tank 1; the temperature probe 24 is arranged in cooling water and is connected with a temperature control switch; the power supply of the compressor 22 is connected with a temperature control switch and is used for controlling the on-off of the compressor 22 through temperature change so as to keep the temperature of the cooling water constant. In this embodiment, water storage tank 21 is the plastics material, and outside parcel heat preservation accuse temperature, and the required cooling water of experiment is equipped with to inside.
In a preferred embodiment, the multi-channel corrosion monitor 41 incorporates a zero-resistance current meter and a voltmeter, and is capable of measuring a couple current and a coupling potential.
As a preferred embodiment, the system further comprises a signal acquisition control system, which is connected to the multi-channel corrosion monitor 41, and is configured to acquire data measured by the multi-channel corrosion monitor 41 and control the on/off and the measurement period of the multi-channel corrosion monitor 41.
The monitoring method of the top corrosion monitoring experiment system in the embodiment comprises the following steps:
s01: the array electrode sensor is arranged in a sensor clamp 5 and is arranged in a top corrosion experimental device;
s02: leading out 9 long wires at the back of the sensor through threading holes in the side walls of the sensor clamp 5 and the upper end cover 2, and connecting the wires with a multi-channel corrosion monitoring sensor, wherein 8 pipeline steel elements are connected with a working electrode interface, and 1 stainless steel element is connected with a reference electrode interface;
s03: controlling the top cooling water tank 1 to keep a constant preset temperature through a circulating cooling water control system, and controlling the solution in the bottom glass container 3 to keep the constant preset temperature through a water area constant temperature device, wherein the preset temperature of the liquid in the top cooling water tank 1 is lower than the preset temperature of the liquid in the bottom glass container 3;
s04: continuously measuring couple current among 8 pipeline steel test pieces and coupling potential of the 8 pipeline steel test pieces relative to the stainless steel test piece through a signal acquisition control system, recording data and storing documents;
s05: analyzing and processing the data acquired by the signal acquisition control system to obtain the respective average corrosion depths of the corrosion elements;
s06: and comparing the characteristics of the couple current and the coupling potential to obtain the distribution position of the liquid drops and the dropping period of the liquid drops.
In the monitoring process, the corrosion environment of the top corrosion is relatively tiny condensed liquid drops. A droplet coverage area with higher conductivity and higher galvanic current density between adjacent test pieces; no droplet coverage area, lower conductivity, and lower galvanic current density between adjacent test strips. And the sum of the galvanic current densities of the test pieces in the same droplet coverage area is 0. Therefore, the droplet adhesion region can be estimated from the galvanic current density data measured by the multi-channel corrosion monitor 41. When the liquid drops drop, the corrosion environment is changed violently, and the current density is changed suddenly. Therefore, the residence time of the liquid drop on the surface of the test piece can be obtained through the mutation period of the current density.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a multi-electrode top corrosion monitoring sensor, its characterized in that includes outer tube, working electrode component, reference electrode component and insulating part, working electrode component and reference electrode component size are the same and all fix on the outer tube, working electrode component and reference electrode component's working face and the corrosive environment direct contact that awaits measuring, and the two all uses except the working face insulating part cladding, working electrode component is square pipeline steel test piece, reference electrode component is the stainless steel test piece.
2. A multi-electrode top corrosion monitoring sensor according to claim 1, wherein said working and reference electrode elements are arranged in a 3 x 3 array with 8 working electrode elements around the perimeter and 1 reference electrode element centered.
3. A multi-electrode top corrosion monitoring sensor according to claim 1 wherein the working surface dimensions, thickness, distance between adjacent elements of the working and reference electrode elements are preset values adapted to the environment to be tested, wherein the coupon side length is less than the diameter of the droplet formed by the corrosive environment.
4. A top corrosion monitoring experiment system is characterized by comprising the multi-electrode top corrosion sensor as claimed in any one of claims 1 to 3, an experiment device capable of simulating top corrosion, a temperature control system and a multi-channel corrosion monitor, wherein the experiment device capable of simulating top corrosion is used for simulating top corrosion and comprises a top cooling water tank, an upper end cover, a glass container, a base and a sensor clamp, and the top cooling water tank is made of stainless steel and comprises a water inlet and a water outlet; the top cooling water tank is located on the upper end cover in a circular bead matching mode, the sensor clamp is arranged between the cooling water tank and the upper end cover, the glass container is arranged between the upper end cover and the base in a circular bead matching mode, through holes are formed in four corners of the upper end cover and the base, the glass container is fastened to achieve a sealing effect through the matching of the nut and the screw, the temperature control system is used for controlling the water in the top cooling water tank and the glass container to be at a preset temperature, the multi-electrode top corrosion sensor is detachably connected to the sensor holder, the multi-electrode top corrosion sensor includes long leads attached to corresponding surfaces of the working surfaces of the respective electrode elements, the multi-electrode top corrosion sensor is connected with a multi-channel corrosion monitor, and the multi-channel corrosion monitor is used for measuring galvanic couple current and coupling potential according to feedback of the multi-electrode top corrosion sensor.
5. The overhead corrosion monitoring experiment system according to claim 4, wherein the temperature control system comprises a circulating cooling water control system for maintaining the overhead cooling water tank at a preset temperature and a water thermostat for maintaining the glass container at a preset temperature, the preset temperature of the liquid inside the overhead cooling water tank is lower than the preset temperature of the liquid inside the bottom glass container, and the circulating cooling water control system is connected to the water inlet and the water outlet.
6. The top corrosion monitoring experiment system of claim 5, wherein the recirculated cooling water control system comprises a water reservoir, a water pump A, a water pump B, PVC, a compressor, a temperature probe, and a temperature control switch, wherein the water reservoir stores cooling water; the water pump A is used for forming a closed loop with the compressor through a PVC hose to circularly refrigerate cooling water in the water storage tank; the water pump B is used for forming a closed loop with the top cooling water tank through a PVC hose, and circulating low-temperature cooling water through the top cooling water tank to provide a top low-temperature environment; the temperature probe is arranged in cooling water and is connected with the temperature control switch; the compressor power is connected with the temperature control switch and used for controlling the on-off of the compressor through temperature change so as to keep the temperature of the cooling water constant.
7. The overhead corrosion monitoring experiment system of claim 4, wherein the multichannel corrosion monitor is internally provided with a zero resistance current meter and a voltmeter.
8. The top corrosion monitoring experiment system of claim 4, further comprising a signal acquisition control system connected to the multi-channel corrosion monitor, for acquiring data measured by the multi-channel corrosion monitor and controlling the on/off and measurement period of the multi-channel corrosion monitor.
9. A monitoring method of a top corrosion monitoring experiment system is characterized by comprising the following steps:
s01: installing an array electrode sensor in a sensor clamp and placing the sensor clamp in a top corrosion experimental device;
s02: leading out 9 long wires at the back of the sensor through a sensor clamp and a threading hole on the side wall of an upper end cover, and connecting the wires with a multi-channel corrosion monitoring sensor, wherein 8 pipeline steel elements are connected with a working electrode interface, and 1 stainless steel element is connected with a reference electrode interface;
s03: controlling a top cooling water tank to keep a constant preset temperature through a circulating cooling water control system, and controlling a solution in a bottom glass container to keep the constant preset temperature through a water area constant temperature device, wherein the preset temperature of liquid in the top cooling water tank is lower than the preset temperature of liquid in the bottom glass container;
s04: continuously measuring couple current among 8 pipeline steel test pieces and coupling potential of the 8 pipeline steel test pieces relative to the stainless steel test piece through a signal acquisition control system, recording data and storing documents;
s05: analyzing and processing the data acquired by the signal acquisition control system to obtain the respective average corrosion depths of the corrosion elements;
s06: and comparing the characteristics of the couple current and the coupling potential to obtain the distribution position of the liquid drops and the dropping period of the liquid drops.
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| CN111929158A (en) * | 2020-08-07 | 2020-11-13 | 中海石油深海开发有限公司 | Device and method capable of monitoring local stress and non-uniform corrosion of welding seam |
| CN114705731A (en) * | 2022-06-01 | 2022-07-05 | 中国电建集团华东勘测设计研究院有限公司 | Sensor for monitoring stripping depth and corrosion state of damaged part of coating and monitoring method |
| US20230228669A1 (en) * | 2020-05-29 | 2023-07-20 | Wisegrow Investments Pty Ltd | Surface corrosion monitoring system |
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