CN215328376U - Impressed current cathodic protection system for FPSO - Google Patents
Impressed current cathodic protection system for FPSO Download PDFInfo
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- CN215328376U CN215328376U CN202121688527.XU CN202121688527U CN215328376U CN 215328376 U CN215328376 U CN 215328376U CN 202121688527 U CN202121688527 U CN 202121688527U CN 215328376 U CN215328376 U CN 215328376U
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- 238000004210 cathodic protection Methods 0.000 title claims abstract description 26
- 238000005260 corrosion Methods 0.000 claims abstract description 57
- 230000007797 corrosion Effects 0.000 claims abstract description 56
- 238000012544 monitoring process Methods 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims description 10
- 238000013500 data storage Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
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Abstract
The utility model provides an impressed current cathodic protection system for FPSO, comprising: the device comprises a control host, an auxiliary anode, a potential monitoring module and a multi-channel controller; the control host is arranged in the FPSO control room; the potential monitoring module comprises potential acquisition equipment and a plurality of reference electrodes; the reference electrode is connected with the potential acquisition equipment through a data transmission line; the potential acquisition equipment is connected with the control host; the multi-channel controller comprises a plurality of current output control modules; the positive pole of the current output control module is connected with the auxiliary anode through an anode cable, and the negative pole of the current output control module is connected with the hull shell through a cathode cable; and the multi-channel controller is connected with the control host through the data transmission line. The utility model adopts a multi-channel controller, and can independently control the output current of each auxiliary anode on the FPSO according to the result of the corrosion state prediction module, thereby realizing fine control and leading the FPSO to obtain better protection.
Description
Technical Field
The utility model relates to the field of FPSO impressed current cathodic protection, in particular to an impressed current cathodic protection system for an FPSO.
Background
FPSOs are in salt fog, moisture and seawater environments for a long time, and are subjected to the action of surrounding media to generate long-term electrochemical corrosion, so that structural corrosion is very serious. Corrosion generally reduces the mechanical properties of the structural material and shortens the service life thereof, so that the corrosion protection of the large marine structures is very important.
Currently, there are over 100 FPSOs in active service worldwide, of which only the chinese marine oil sector holds 17. In the early days, the cathodic protection technology of the sacrificial anode is adopted for corrosion prevention of large floating ocean platforms, FPSOs and the like, and the cathodic protection technology of the impressed current and the cathodic protection technology of the sacrificial anode are combined. According to the engineering cases of a plurality of anti-corrosion companies at home and abroad, the problem that the sacrificial anode is consumed too fast exists in the large ocean structure adopting the sacrificial anode cathodic protection scheme in the middle and later period of the service life of the large ocean structure, and the design and engineering requirements cannot be met, so that only a cathodic protection system with impressed current can be additionally installed for remediation. For example: the semi-submersible platform Pride South Atlantic operated for 26 years has insufficient protection of the original sacrificial anode cathodic protection system, so that the cathodic protection system with impressed current is additionally arranged. Currently, impressed current cathodic protection is the most economical and environment-friendly anticorrosion measure for preventing corrosion of steel structures recognized at home and abroad.
At present, the products of impressed current cathodic protection systems for FPSOs provided in the market have the problems that the system control technology level is low, all auxiliary anodes adopt a extensive integral control mode, and the regulation and control based on the integral corrosion protection level requirement cannot be realized, so that the current control on a single loop is inaccurate; the method does not have the function of monitoring and predicting the whole corrosion protection state at the same time.
SUMMERY OF THE UTILITY MODEL
The utility model provides an impressed current cathodic protection system for an FPSO (floating production storage and offloading), which aims to solve the technical problems that the control technical level of the conventional impressed current cathodic protection system for the FPSO is low, all auxiliary anodes adopt a rough integral control mode, the regulation and control based on the integral corrosion protection level requirement cannot be realized, the current control on a single loop is inaccurate, and the function of monitoring and predicting the integral corrosion protection state is not realized at the same time.
An impressed current cathodic protection system for an FPSO comprising: the system comprises a control host, a plurality of auxiliary anodes, a potential monitoring module and a multi-channel controller;
the control host is arranged in the FPSO control room;
the potential monitoring module comprises potential acquisition equipment and a plurality of reference electrodes; the plurality of reference electrodes are connected with the potential acquisition equipment through data transmission lines; the potential acquisition equipment is connected with the control host;
the multi-path controller comprises a plurality of current output control modules; the anodes of the current output control modules are connected with the auxiliary anodes through anode cables, and the cathodes of the current output control modules are connected with the hull shell through cathode cables; and the multi-channel controller is connected with the control host through the data transmission line.
Furthermore, the control host comprises a corrosion potential measuring module, a data processing module, a multi-channel controller control module and a corrosion state predicting module;
the corrosion potential measuring module is connected with the potential collecting equipment through a circuit;
the corrosion potential measuring module is electrically connected with the data processing module;
the data processing module is electrically connected with the multi-channel controller control module;
the multi-channel controller control module is electrically connected with the multi-channel controller;
the corrosion state prediction module is electrically connected with the corrosion potential measurement module.
Further, the corrosion state prediction module comprises a corrosion state data storage module and a protection effect prediction module which are electrically connected with the corrosion state prediction module.
Further, the multi-channel controller also comprises a control panel electrically connected with the multi-channel controller.
Compared with the prior art, the impressed current cathodic protection system for the FPSO has the following advantages: adopt multi-channel controller, can be simultaneously according to the result of corrosion state prediction module, through the output current of every auxiliary anode on multi-channel controller individual control FPSO, can realize the control that becomes more meticulous to make FPSO obtain better protection.
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 diagram of an FPSO impressed current cathodic protection system of the present invention;
FIG. 2 is a layout diagram of a potential monitoring module.
Wherein, 1, controlling the host computer; 2. an auxiliary anode; 3. a potential monitoring module; 4. a cathode cable; 5. a multi-channel controller; 6. a reference electrode; 7. a potential collecting device; 8. a data transmission line; 9. an anode cable; 10. a hull shell.
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.
An impressed current cathodic protection system for an FPSO comprising: the system comprises a control host 1, a plurality of auxiliary anodes 2, a potential monitoring module 3 and a multi-channel controller 5, as shown in figure 1;
the control host 1 is arranged in an FPSO control room; in this embodiment, the control host 1 is an industrial control computer with high reliability, and can exchange data with the potential monitoring module 3 and the multi-channel controller 5 through a communication interface;
the control host 1 comprises a corrosion potential measuring module, a data processing module, a multi-channel controller control module and a corrosion state predicting module; the corrosion potential measuring module is in circuit connection with the potential acquisition equipment 7; the corrosion potential measuring module is electrically connected with the data processing module; the data processing module is electrically connected with the multi-channel controller control module; the multi-channel controller control module is electrically connected with the multi-channel controller 5; the corrosion state prediction module is electrically connected with the corrosion potential measurement module.
The corrosion state prediction module comprises a corrosion state data storage module and a protection effect prediction module which are electrically connected with the corrosion state prediction module. Specifically, the corrosion state data storage module in this embodiment is a corrosion state database built in the corrosion state prediction module, where the corrosion state database is a corrosion state database built in the FPSO underwater hull casing in the full life cycle, and establishes an FPSO underwater hull casing boundary meta-model according to an FPSO type line diagram and related corrosion parameters, and calculates corrosion state files of the FPSO underwater hull casing at different times and under different working conditions by using a conventional corrosion numerical simulation calculation method, and then arranges and summarizes the corrosion state files to obtain the FPSO underwater hull casing corrosion state database, where the establishment method of the corrosion state database is a conventional calculation method in the field, and is not a technical point of the present invention, and is only convenient for a person skilled in the art to understand a technical scheme.
The protection effect prediction module obtains the corrosion state of the current FPSO underwater hull shell according to real-time monitoring data obtained by the potential monitoring module 3 and a prediction method built in the protection effect prediction module, and can realize the visualization of the corrosion state in a 3D potential cloud picture mode through a display screen on the control host 1. The prediction method for determining the current ship protection state, which is built in the protection effect prediction module, is the prior art and does not belong to the technical point of the utility model.
And exchanging the FPSO potential information acquired from the corrosion state prediction module with the data processing module, and realizing effective protection of the FPSO hull shell by realizing accurate control of the current output control module through each current output control module through a multi-channel controller control module.
The potential monitoring module 3 comprises a potential acquisition device 7 and a plurality of reference electrodes 6, as shown in fig. 2; the reference electrodes 6 are connected with the potential acquisition equipment 7 through a data transmission line 8 so as to monitor the potential of multiple points on the outer surface of the FPSO hull; the potential acquisition equipment 7 is connected with the control host 1 to convert the monitored potential signals of multiple points on the outer surface of the FPSO hull into control signals and transmit the control signals to the control host 1; the reference electrode 6 and the auxiliary anode 2 are fixedly arranged on the underwater outer surface of the FPSO, the reference electrode 6 can give out potential signals at monitoring points of the underwater outer surface of the FPSO and transmit the potential signals to the potential acquisition equipment 7, and the potential acquisition equipment 7 converts the potential signals into digital signals and transmits the digital signals to the control host 1 through the data transmission line 8.
The multi-channel controller 5 is arranged in a cabin on the FPSO and comprises a plurality of current output control modules; the anodes of the current output control modules are connected with the auxiliary anode 2 through an anode cable 9, and the cathodes of the current output control modules are connected with a hull shell 10 through a cathode cable 4; the multi-channel controller 5 is connected with the control host 1 through the data transmission line 8, so that the output current of each auxiliary anode 2 can be independently controlled through a plurality of current output control modules, and the output current of the auxiliary anode 2 is manually controlled through a control panel on the multi-channel controller 5 or is remotely controlled through the control host 1.
Be provided with the sealing member between auxiliary anode 2 and reference electrode 6 and the hull shell, adopt O type sealing washer in specific this embodiment, work as auxiliary anode 2 and reference electrode 6 are installed behind the FPSO hull planking under water, can realize watertight effect.
Specifically, the impressed current cathodic protection system for the FPSO comprises the following specific working processes:
(1) the auxiliary anode and the reference electrode are fixedly arranged on the outer surface of the ship body below the FPSO waterline, and the water tightness of the installation position is ensured;
(2) installing a control host in an FPSO protection control room;
(3) installing a multi-channel controller and a potential collector in a dry cabin on an FPSO;
(4) each installed auxiliary anode is connected with the output anode of the multi-path controller through an anode cable;
(5) the output negative pole of the multi-channel controller is connected with the FPSO hull through a cathode cable;
(6) each installed reference electrode is respectively connected with potential acquisition equipment through a data transmission line;
(7) connecting the multi-channel controller and the potential acquisition equipment with a control host through data transmission lines respectively;
(8) starting the FPSO impressed current cathodic protection system, adjusting the output current of each current output control module through a button on a control host or a multi-path controller, and releasing the current through each auxiliary anode on the FPSO underwater hull shell;
(9) the reference electrode obtains a potential signal at a monitoring point, and the signal is transmitted to potential acquisition equipment through a data transmission line;
(10) the potential acquisition equipment converts the potential signal into a digital signal and transmits the digital signal to the control host; the control host displays and automatically stores the data from the potential collector;
(11) a protection effect prediction module in the control host reads the digital signals of each monitoring point, and finds a corrosion state file matched with the current FPSO underwater ship corrosion state in a corrosion state database by using an internal prediction method; and displaying a ship corrosion state potential cloud picture below the current FPSO waterline through a control host display screen;
(12) determining whether the underwater external surface potential of the FPSO enables the FPSO to be in a protected state or not according to a ship corrosion state 3D potential cloud picture below the FPSO waterline obtained by a corrosion state prediction module;
(13) if the potential of the underwater outer surface of the FPSO can enable the FPSO to be in a protected state, the current output current is kept;
(14) and (3) if the potential of the underwater outer surface of the FPSO can not enable the FPSO to be in the protected state, adjusting the output current of each auxiliary anode through a multi-path controller, and repeating the steps (10) to (13) until the potential of the underwater outer surface of the FPSO can enable the FPSO to be in the protected state.
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 utility model 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 (4)
1. An impressed current cathodic protection system for an FPSO, comprising: the device comprises a control host (1), a plurality of auxiliary anodes (2), a potential monitoring module (3) and a multi-channel controller (5);
the control host (1) is arranged in the FPSO control room;
the potential monitoring module (3) comprises a potential acquisition device (7) and a plurality of reference electrodes (6); the reference electrodes (6) are connected with the potential acquisition equipment (7) through data transmission lines (8); the potential acquisition equipment (7) is connected with the control host (1);
the multi-path controller (5) comprises a plurality of current output control modules; the anodes of the current output control modules are connected with the auxiliary anode (2) through an anode cable (9), and the cathodes of the current output control modules are connected with a hull shell (10) through a cathode cable (4); the multi-channel controller (5) is connected with the control host (1) through the data transmission line (8).
2. The impressed current cathodic protection system for an FPSO as defined in claim 1, wherein said control host (1) comprises a corrosion potential measuring module, a data processing module, a multi-channel controller control module and a corrosion state prediction module;
the corrosion potential measuring module is in circuit connection with the potential acquisition equipment (7);
the corrosion potential measuring module is electrically connected with the data processing module;
the data processing module is electrically connected with the multi-channel controller control module;
the multi-channel controller prediction module is electrically connected with the multi-channel controller (5);
the corrosion state prediction module is electrically connected with the corrosion potential measurement module.
3. The impressed current cathodic protection system for an FPSO of claim 2 wherein the corrosion state prediction module comprises a corrosion state data storage module and a protection effectiveness prediction module electrically connected thereto.
4. Impressed current cathodic protection system for an FPSO as claimed in claim 1 wherein the multiplex controller (5) further comprises a control panel electrically connected thereto.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121688527.XU CN215328376U (en) | 2021-07-23 | 2021-07-23 | Impressed current cathodic protection system for FPSO |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121688527.XU CN215328376U (en) | 2021-07-23 | 2021-07-23 | Impressed current cathodic protection system for FPSO |
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| CN215328376U true CN215328376U (en) | 2021-12-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114737191A (en) * | 2022-03-23 | 2022-07-12 | 中国船舶重工集团公司第七二五研究所 | Distributed impressed current cathodic protection system for ship |
| WO2023221839A1 (en) * | 2022-05-16 | 2023-11-23 | 大连科迈尔防腐科技有限公司 | Fpso external anti-corrosion apparatus |
-
2021
- 2021-07-23 CN CN202121688527.XU patent/CN215328376U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114737191A (en) * | 2022-03-23 | 2022-07-12 | 中国船舶重工集团公司第七二五研究所 | Distributed impressed current cathodic protection system for ship |
| WO2023221839A1 (en) * | 2022-05-16 | 2023-11-23 | 大连科迈尔防腐科技有限公司 | Fpso external anti-corrosion apparatus |
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