Numerical simulation method for cathode-protection shallow-buried type anode ground bed grounding resistance

An anode ground bed and grounding resistance technology is applied in the fields of general anti-corrosion of metal materials and piping systems. Effect

Active Publication Date: 2013-12-04
PIPECHINA SOUTH CHINA CO
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Problems solved by technology

[0007] Although the shallow-buried anode grounding resistance estimation method currently used is convenient to use, the scope of application is very narrow. Specifically, it is only suitable for the case where all anodes are arranged in a straight line, and it is difficult to adapt to the new design of diversified ground beds. need

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  • Numerical simulation method for cathode-protection shallow-buried type anode ground bed grounding resistance
  • Numerical simulation method for cathode-protection shallow-buried type anode ground bed grounding resistance
  • Numerical simulation method for cathode-protection shallow-buried type anode ground bed grounding resistance

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Embodiment

[0031] Embodiment. A real anode ground bed design case is used to illustrate the implementation process of this numerical simulation method.

[0032] This case involves the displacement of a shallow buried anode bed in a densely populated area. The scale of the new anode ground bed is required to be controlled within the range of 5 meters × 30 meters. The amount of high-silicon cast iron anodes is set at about 15 pieces, each with a length of 1.5 meters, and the buried depth of the anode is 1.5 meters. The designed grounding resistance of the ground bed is controlled at 2 within ohms.

[0033] The soil resistivity measured in the field is between 60Ωm and 70Ωm, and the representative 60Ωm and 70Ωm are selected for the calculation of the grounding resistance of the ground bed.

[0034] In this case, 5 anode bed designs are selected, specifically: 2 groups × 6, 2 groups × 7, 2 groups × 8, 2 groups × 9, 3 rows × 6, the distance between each anode , The distance between groups i...

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Abstract

The invention is a numerical simulation method for a cathode-protection shallow-buried type anode ground bed grounding resistance, and relates to the technical fields of general corrosion prevention and pipeline system of metal materials. The numerical simulation method comprises the following steps: carrying out preliminary design of a ground bed; measuring on-site parameters; setting a plurality of preliminary ground bed design schemes; aimed at each of the preliminary design schemes, building a corresponding three-dimensional geometric model; dividing gridding and setting boundaries; solving a calculation model, and utilizing the Ohm's law to obtain the anode ground bed grounding resistance; finally, continuing to create a ground bed grounding resistance variable Rgrounding for storing a ground bed grounding resistance value with an expression formula of Rgrounding=delta U / I-total, wherein delta U represents a difference between a set anode ground bed boundary potential and a spherical crown potential; and thus obtaining corresponding grounding resistance values of the ground bed design schemes in specific soil conditions. The method is based on a finite element discretization algorithm, has wide application range, is simple and feasible to implement, and has high accuracy.

Description

technical field [0001] The invention relates to a method for numerically simulating the grounding resistance of a cathodic protection shallow-buried anode ground bed, and relates to the technical fields of general anticorrosion of metal materials and pipeline systems. Background technique [0002] Cathodic protection is one of the important protective measures for buried metal pipelines. It provides protection for pipelines under the condition of failure or damage of the anticorrosion layer. It can be divided into two forms: forced current method and sacrificial anode method. In the actual cathodic protection practice of buried metal pipelines, the forced current method is often used as the main method, and the sacrificial anode method is supplemented. [0003] Simply put, the basic composition of forced current cathodic protection has three parts, which are DC power supply, anode ground bed, and buried metal pipelines to be protected, such as figure 1 shown. The correspon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F13/02C23F13/06
Inventor 毕武喜王维斌薛致远徐承伟陈洪源张丰赵君苏展
Owner PIPECHINA SOUTH CHINA CO
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