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Carbon steel pipeline CO2 solution corrosion rate prediction method based on computational fluid mechanics

A technology of computational fluid dynamics and corrosion rate, applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as incapable coupling analysis, save time, manpower and material costs, and improve efficiency

Active Publication Date: 2017-07-14
XI AN JIAOTONG UNIV +1
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Problems solved by technology

At present, there is no way to use computational fluid dynamics to analyze CO 2 Coupling analysis technology for mass transfer, chemical reaction and wall electrochemical reaction involved in corrosion

Method used

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  • Carbon steel pipeline CO2 solution corrosion rate prediction method based on computational fluid mechanics
  • Carbon steel pipeline CO2 solution corrosion rate prediction method based on computational fluid mechanics
  • Carbon steel pipeline CO2 solution corrosion rate prediction method based on computational fluid mechanics

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Embodiment Construction

[0051] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0052] CO in a carbon steel straight pipe with a diameter of 15mm 2 The corrosion rate prediction of aqueous solution is taken as an example to illustrate the calculation process. The diameter of carbon steel pipe is 15mm, the water flow velocity changes within 1-10m / s, the flow in the pipe is fully developed, the pH of the solution is 4, the water temperature is 20℃, CO 2 Gas partial pressure is 1 standard atmospheric pressure, now utilize the method of the present invention to CO under flow condition 2 Aqueous solution corrosion rate prediction.

[0053] refer to figure 1 , based on computational fluid dynamics for carbon steel pipeline CO 2 Solution corrosion rate prediction method, comprising the following steps:

[0054] 1) CO 2 Aqueous solution flow model establishment:

[0055] will contain CO 2 The aqueous solution is regarded as an inc...

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Abstract

The invention discloses a carbon steel pipeline CO2 solution corrosion rate prediction method based on computational fluid mechanics. The method comprises the following steps that: firstly, establishing a CO2 aqueous solution flow model; then, establishing a CO2 aqueous solution corrosion chemical reaction model; thirdly, establishing a CO2 aqueous solution corrosion CO2 aqueous solution corrosion electrochemical reaction model; and finally, predicting a carbon steel pipeline CO2 solution corrosion rate. By use of the method, a computational fluid mechanics technology is used for coupling processes including flowing, mass transfer, wall surface electrochemical reaction and the like to which a CO2 corrosion process relates to carry out simulated analysis, a corrosion rate is calculated according to a wall surface Fe2+molar flow rate so as to realize the CO2 solution corrosion rate prediction in a complex pipeline structure. The method can be suitable for any complex flow structure and has the characteristics of being low in cost, wide in applicability, high in efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of pipeline corrosion rate prediction, in particular to carbon steel pipeline CO2 based on computational fluid dynamics 2 Solution corrosion rate prediction method. [0002] technical background [0003] In the process of oil and natural gas extraction and transportation, the medium in the oil and gas pipeline (pipeline material is carbon steel) contains CO 2 and liquid phase water, CO 2 It will dissolve in water to form an acidic solution and corrode the pipe body. The flow will accelerate the mass transfer process of the corrosive medium to the metal wall, thereby accelerating corrosion. Accurate prediction of carbon steel in flowing CO 2 The corrosion rate in aqueous solution has important guiding significance for the corrosion and protection of oil and gas pipelines. Current pipeline CO 2 The prediction of aqueous solution corrosion rate mainly depends on empirical formulas and test data. These empir...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2119/06G06F30/20
Inventor 胡海军程光旭尚万宁夏勇李云江伟平裴廷刚许勇仵海龙徐东晓任发俊李晓容黄昌猛
Owner XI AN JIAOTONG UNIV
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