CN102043888A - Optimal design method for cathode protection system of drilling platform ballast water tank - Google Patents
Optimal design method for cathode protection system of drilling platform ballast water tank Download PDFInfo
- Publication number
- CN102043888A CN102043888A CN201110026675XA CN201110026675A CN102043888A CN 102043888 A CN102043888 A CN 102043888A CN 201110026675X A CN201110026675X A CN 201110026675XA CN 201110026675 A CN201110026675 A CN 201110026675A CN 102043888 A CN102043888 A CN 102043888A
- Authority
- CN
- China
- Prior art keywords
- anode
- information
- boundary element
- calculation
- platform
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 7
- 238000004364 calculation method Methods 0.000 claims abstract description 15
- 230000010287 polarization Effects 0.000 claims abstract description 15
- 238000004088 simulation Methods 0.000 claims abstract description 9
- 238000004422 calculation algorithm Methods 0.000 claims abstract description 4
- 238000005457 optimization Methods 0.000 claims description 14
- 238000004210 cathodic protection Methods 0.000 claims description 7
- 238000012913 prioritisation Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 10
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 11
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000002421 anti-septic effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
Images
Landscapes
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention discloses an optimal design method for a cathode protection system of a drilling platform ballast water tank. Based on boundary element numerical value analog simulation calculation, the optimal design method comprises the following steps: carrying out geometric modeling to a target platform by computer modeling software, and determining numbering information, space coordinate information and other information of each unit and each node in a boundary element model; loading an anode control module to generate digitalized sacrificial anode information; carrying out numerical value simulation calculation by a boundary element algorithm; judging whether the calculation result conforms to polarization characteristics; and judging whether optimized conditions are satisfied nor not. In the method, numerical value calculation is carried out on the basis of the boundary element algorithm, continuous potential information of the structure surface can be obtained, and when the protection potential of any local structure can not satisfy the requirement, the anode is adjusted and calculated again until all protection potential at any position satisfies the requirement. Thus, the problems of 'adsorption-type shielding effect' and 'dodging-type shielding effect' are perfectly solved, and the service life of the platform is prolonged.
Description
Technical field
The present invention relates to the corrosion protection design technology of deep water semi-submersible drilling platform ballast tank in the oceanographic engineering field, particularly a kind of sacrificial anode at the deep water semi-submersible drilling platform ballast tank carries out the Optimization Design of the drilling platform ballast tank cathodic protection system of the reasonable Arrangement on quantitative optimization and the space.
Background technology
Deep water semi-submersible drilling platform is throughout the year at high seas working, and the corrosion of structural steel and iron will cause the decline of structure deposit intensity, reduce operational security; Simultaneously, platform is at high seas working, and the cost that docking is safeguarded is higher.Be to reduce structure erosion, need are carried out corrosion protection design at platform and integrally and are optimized.
Traditional corrosion protection design method adopts according to certain classification society rule, carries out corrosion protection design in conjunction with the mode of experimental formula.Basic step is as follows:
1, confirm the classification society that platform will add, choose the standard of reference in the corrosion protection design in view of the above, common standard has ABS standard, DNV standard or the like;
2, in selected standard, inquire about the corrosion protection design correlation formula that is applicable to target platform;
3, with each parameter input correlation formula of target platform, draw the final argument of corrosion protection design, for example: sacrificial anode quantity, quality, shape, installation site or the like.
The drawback of traditional corrosion protection design method maximum is that what provide in the standard all is experimental formula basically.Promptly when calculating a certain design parameter, some coefficients of formula itself need artificial rule of thumb coming to determine; Perhaps this formula itself is the experience gained, and non-science is derived.Make that so just net result is coarse, promptly the antiseptic effect of corrosion protection system and economy all are not optimum.And classic method can not solve following problem:
1, " absorption shielding effect " problem that causes by pipe system and relevant device etc.;
2, " blocking the formula shielding effect " problem that causes by labyrinth etc.
Above-mentioned two problems are fairly obvious in the deep water semi-submersible drilling platform performance, greatly influenced the protection efficient of corrosion protection system.
Summary of the invention
For solving the problem that prior art exists; the object of the present invention is to provide a kind ofly can solve " absorption shielding effect " problem that causes by pipe system and relevant device etc. and " blocking the formula shielding effect " problem that causes by labyrinth etc., the total life cycle prioritization scheme of establishing ballast tank sacrificial anode system, improve the Optimization Design of drilling platform ballast tank cathodic protection system of the protection efficient of ballast tank sacrificial anode system.
To achieve these goals, technical scheme of the present invention is as follows: a kind of Optimization Design of drilling platform ballast tank cathodic protection system based on the boundary Element Numerical Simulation simulation calculation, may further comprise the steps:
A, set up geometric model: adopt microcomputer modelling software that target platform is carried out Geometric Modeling; Described target platform is the drilling platform that need carry out the cathodic protection system optimal design, and described modeling software comprises commercial engineering softwares such as ANSYS, PANTRAN;
B, set up boundary element model: the geometric model of setting up is carried out grid dividing, establish the information such as numbering, volume coordinate of each unit of boundary element model and each node;
C, loading anodic control module: load the sacrificial anode information after the anodic control module generates digitizing; Described sacrificial anode information comprises the locus coordinate of anode number, anode shape, anode quality, each anode; When loading first, sacrificial anode information draws according to experimental formula; After whole calculating was finished, result of calculation does not satisfy to be optimized when requiring, and the anodic control module is adjusted automatic antianode information, restarts to calculate after adjustment finishes; It is predefined optimization index that described optimization requires, and comprises protection potential value, anode general assembly (TW) and the protection time limit of body structure surface;
D, pre-treatment: the anode information that step C is generated is loaded on unit that step B generates and the nodal information, and draw two large divisions's data: one is material polarization curve data, and it two is unit and node data behind the adding anode;
E, calculating: utilize the boundary element algorithm to carry out numerical simulation and calculate, draw the complete protection potential information of target platform body structure surface, described protection potential information comprises anode current, each node place current potential and current density;
F, judge whether to meet polarization characteristic: the polarization curve that the result of calculation and the step D of step e generated is analyzed; As meeting polarization curve, promptly resulting value all on polarization curve, then enters step G and carries out next step check; As do not meet polarization curve, then pairing unit of the value on polarization curve and nodal information do not carry out the fine setting of locus by adjustment module, return step e then, restart to calculate;
G, judge whether satisfy to optimize to require: judge that according to the anode information that the result of calculation and the pairing step C of step e generates if satisfy predefined optimization requirement, then export prioritization scheme, this calculates end; If do not satisfy, return step C, carry out anode by the anodic control module and regulate, recomputate; Described prioritization scheme comprises shape, size, quantity and the locus of sacrificial anode.
Compared with prior art, the present invention has following beneficial effect:
1, owing to being based on boundary element method, the present invention carries out numerical evaluation, can obtain the current potential information of continuous body structure surface, the protection potential of any one partial structurtes does not meet the demands, all will adjust by antianode, restart to calculate, till the protection potential of optional position all met the demands, therefore, the present invention had ideally solved " absorption shielding effect " and " blocking the formula shielding effect " problem; And classic method is ignored the influence of these two kinds of shielding effects to antiseptic effect fully owing to be based on experimental formula.
2, because the present invention utilizes boundary element simulation calculation technology, accurately determined the parameters of whole sacrificial anode system.In the degree of precision scope, guarantee to have alleviated the general assembly (TW) of sacrificial anode system under the prerequisite of antiseptic effect.Thereby alleviated the weight of semisubmersible platform, improved the changing load of platform, promoted the work capacity of semi-submersible rig, improved the serviceable life of platform; Brought considerable economic again.
Description of drawings
The present invention is 1 of drawings attached only, wherein:
Fig. 1 is a FB(flow block) of the present invention.
Embodiment
Below in conjunction with accompanying drawing beneficial effect of the present invention is described further.The present invention is that example is calculated as follows with certain ballast tank at the labour deep water semi-submersible drilling platform:
The basic parameter of designing requirement: be 12 years designed life, and the protection area is 59228m2, the military service ocean environment parameter ... or the like.
When adopting classic method,, and, draw the anode arrangement option A in conjunction with the experimental formula that it provides with reference to the DNV standard:
Anode position: (summary);
Anode general assembly (TW): 36117.1kg;
Anode quantity: 1184.
And when adopting method of the present invention, single calculation is carried out in the setting of option A, and promptly not being optimized, the real protection life-span that draws option A has only 10.81 years.The described protection life-span can describe by protection potential, by detecting, confirms that result of calculation of the present invention is reliable on the spot.
According to process flow diagram shown in Figure 1 the ballast tank of this platform is carried out modeling and computation optimization, draws the anode arrangement option b after the optimization:
Anode position: (summary);
Anode general assembly (TW): 32822.6kg;
Anode quantity: 1076.
By comparing, we find that classic method makes its scheme that draws often not reach requirement designed life owing to do not consider the influence of two kinds of shielding effects.And what classic method adopted in design process is experimental formula, relatively conservative, causes and adopts anode block too much.Method of the present invention is accurately guaranteeing by the reasonable Arrangement anode, to have reduced the anode block number under the prerequisite of designed life based on boundary Element.In this example and classic method relatively, reduced by 9.12% anode consumption.
Claims (1)
1. the Optimization Design of a drilling platform ballast tank cathodic protection system is characterized in that: based on the boundary Element Numerical Simulation simulation calculation, may further comprise the steps:
A, set up geometric model: adopt microcomputer modelling software that target platform is carried out Geometric Modeling; Described target platform is the drilling platform that need carry out the cathodic protection system optimal design, and described modeling software comprises commercial engineering softwares such as ANSYS, PANTRAN;
B, set up boundary element model: the geometric model of setting up is carried out grid dividing, establish the information such as numbering, volume coordinate of each unit of boundary element model and each node;
C, loading anodic control module: load the sacrificial anode information after the anodic control module generates digitizing; Described sacrificial anode information comprises the locus coordinate of anode number, anode shape, anode quality, each anode; When loading first, sacrificial anode information draws according to experimental formula; After whole calculating was finished, result of calculation does not satisfy to be optimized when requiring, and the anodic control module is adjusted automatic antianode information, restarts to calculate after adjustment finishes; It is predefined optimization index that described optimization requires, and comprises protection potential value, anode general assembly (TW) and the protection time limit of body structure surface;
D, pre-treatment: the anode information that step C is generated is loaded on unit that step B generates and the nodal information, and draw two large divisions's data: one is material polarization curve data, and it two is unit and node data behind the adding anode;
E, calculating: utilize the boundary element algorithm to carry out numerical simulation and calculate, draw the complete protection potential information of target platform body structure surface, described protection potential information comprises anode current, each node place current potential and current density;
F, judge whether to meet polarization characteristic: the polarization curve that the result of calculation and the step D of step e generated is analyzed; As meeting polarization curve, promptly resulting value all on polarization curve, then enters step G and carries out next step check; As do not meet polarization curve, then pairing unit of the value on polarization curve and nodal information do not carry out the fine setting of locus by adjustment module, return step e then, restart to calculate;
G, judge whether satisfy to optimize to require: judge that according to the anode information that the result of calculation and the pairing step C of step e generates if satisfy predefined optimization requirement, then export prioritization scheme, this calculates end; If do not satisfy, return step C, carry out anode by the anodic control module and regulate, recomputate; Described prioritization scheme comprises shape, size, quantity and the locus of sacrificial anode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110026675XA CN102043888A (en) | 2011-01-25 | 2011-01-25 | Optimal design method for cathode protection system of drilling platform ballast water tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110026675XA CN102043888A (en) | 2011-01-25 | 2011-01-25 | Optimal design method for cathode protection system of drilling platform ballast water tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102043888A true CN102043888A (en) | 2011-05-04 |
Family
ID=43910024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110026675XA Pending CN102043888A (en) | 2011-01-25 | 2011-01-25 | Optimal design method for cathode protection system of drilling platform ballast water tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102043888A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103530461A (en) * | 2013-10-14 | 2014-01-22 | 南京晓庄学院 | Correction method for grid outflow rate used for flood routing numerical calculation |
| CN104498961A (en) * | 2014-12-03 | 2015-04-08 | 中国船舶重工集团公司第七二五研究所 | Integrated anti-corrosion method for water ballast space with complex structure |
| CN105154887A (en) * | 2015-09-16 | 2015-12-16 | 哈尔滨工业大学 | Method for optimally designing of impressed current cathodic corrosion control system of steel-concrete structures |
| CN107245720A (en) * | 2017-06-06 | 2017-10-13 | 北京市燃气集团有限责任公司 | Gas station region cathodic protection Optimization Design based on the Big Dipper |
-
2011
- 2011-01-25 CN CN201110026675XA patent/CN102043888A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103530461A (en) * | 2013-10-14 | 2014-01-22 | 南京晓庄学院 | Correction method for grid outflow rate used for flood routing numerical calculation |
| CN104498961A (en) * | 2014-12-03 | 2015-04-08 | 中国船舶重工集团公司第七二五研究所 | Integrated anti-corrosion method for water ballast space with complex structure |
| CN105154887A (en) * | 2015-09-16 | 2015-12-16 | 哈尔滨工业大学 | Method for optimally designing of impressed current cathodic corrosion control system of steel-concrete structures |
| CN105154887B (en) * | 2015-09-16 | 2017-06-16 | 哈尔滨工业大学 | Steel and concrete structure impressed current cathodic corrosion control system Optimization Design |
| CN107245720A (en) * | 2017-06-06 | 2017-10-13 | 北京市燃气集团有限责任公司 | Gas station region cathodic protection Optimization Design based on the Big Dipper |
| CN107245720B (en) * | 2017-06-06 | 2018-03-13 | 北京市燃气集团有限责任公司 | Gas station region cathodic protection Optimization Design based on the Big Dipper |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Xun et al. | Evaluation of ecological sustainability based on a revised three-dimensional ecological footprint model in Shandong Province, China | |
| CN102043888A (en) | Optimal design method for cathode protection system of drilling platform ballast water tank | |
| CN103761429A (en) | Milling workpiece surface roughness predicting method | |
| Aguilera et al. | Technological progress and the availability of European oil and gas resources | |
| CN104699890B (en) | A kind of modeling method of the short-term Early-warning Model of city net distribution transforming heavy-overload | |
| CN104050514A (en) | Sea wave significant wave height long-term trend prediction method based on reanalysis data | |
| CN103984995A (en) | Judgment method of deep foundation pit engineering risk early-warning index based on benefit-danger balance point | |
| CN109255834A (en) | Deposit three-dimensional oil in place evaluation method | |
| Liu et al. | A systems dynamic model of a coal-based city with multiple adaptive scenarios: A case study of Ordos, China | |
| Park et al. | Simulation methods of a system dynamics model for efficient operations and planning of capacity expansion of activated-sludge wastewater treatment plants | |
| CN111721835A (en) | Intelligent monitoring method for grinding wheel state of hollow drill | |
| Menke et al. | Modeling variable speed pumps for optimal pump scheduling | |
| Zeng et al. | Dynamic simulation of urban water metabolism under water environmental carrying capacity restrictions | |
| KR101474874B1 (en) | computing system for well placement optimization developed by SA/ANN and well placement optimization method using Thereof | |
| CN104298214A (en) | Comprehensive optimization and control method for blast furnace molten iron productive process | |
| CN111898273B (en) | River water environment capacity determination method based on water quality target of water functional area | |
| Didelot et al. | Balancing energy efficiency and fossil fuel: the role of carbon pricing | |
| CN103810324B (en) | A kind of build-up tolerance Optimization Design optimized based on cost objective | |
| CN102722754B (en) | Coking industry is based on the coal gas dynamic balancing dispatching method of expert system and system | |
| Yang et al. | An efficient simulation–optimization approach for controlling seawater intrusion | |
| Kühn et al. | Multivariate regression model from water level and production rate time series for the geothermal reservoir Waiwera (New Zealand) | |
| Kontos et al. | Optimal management of a polluted fractured aquifer, using genetic algorithms | |
| Zhou et al. | General regression neural network forecasting model based on PSO algorithm in water demand | |
| CN102609392B (en) | High-end marine engineering equipment designs the quick calculation method in man-hour | |
| Soto et al. | Sensitivity and uncertainty analysis of models for determining energy consumption in the residential sector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110504 |