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Method for determining influence factors of flow velocity and turbulence on naphthenic acid corrosion rate

A technology that affects factors and corrosion rates, applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problems such as the difficulty of clarifying the quantitative relationship, the inability to directly establish the turbulence-corrosion rate quantification function law, and the lack of research. Achieve the effect of good engineering application value

Pending Publication Date: 2021-04-13
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing studies have determined that the main parameters of the corrosion model include four parts: baseline corrosion rate, temperature, active sulfide content, flow velocity, and turbulence. However, the quantitative relationship between flow velocity, turbulence, and naphthenic acid corrosion is difficult to clarify at present. The main reasons are: The influence of turbulence intensity on the maximum corrosion depth is nonlinear, and people's research on this aspect is extremely lacking, and it is impossible to directly establish the quantitative function law between turbulence and corrosion rate

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  • Method for determining influence factors of flow velocity and turbulence on naphthenic acid corrosion rate
  • Method for determining influence factors of flow velocity and turbulence on naphthenic acid corrosion rate
  • Method for determining influence factors of flow velocity and turbulence on naphthenic acid corrosion rate

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Embodiment 1

[0036] A kind of flow velocity and turbulent flow that the present invention provides are to the specific implementation steps of the method for determining the influence factor of naphthenic acid corrosion rate as follows:

[0037] 1. Determine whether there is naphthenic acid corrosion in the equipment operating environment;

[0038] 2. Analyze the structure of the equipment and the state of naphthenic acid, judge whether the influence of flow velocity and turbulence on the corrosion of naphthenic acid exists, and determine the naphthenic acid flow rate f and turbulence intensity u% according to the specific working environment;

[0039] 3. Establish the corrosion of static naphthenic acid fluid in the pipeline as a comparative test, calculate the average corrosion rate ν at the most severely corroded local position (elbow, tee) according to the weight loss of the sample before and after corrosion o 、ν f ; Combined with the effective exposed area, the average corrosion dept...

Embodiment 2

[0044] The method to determine the influence factors of velocity and turbulence on the corrosion rate of naphthenic acid in 20G low carbon steel pipeline is as follows:

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Abstract

The invention discloses a method for determining influence factors of a flow velocity and turbulence on a naphthenic acid corrosion rate, and relates to determination of the influence factors of the naphthenic acid corrosion rate. A quantitative rule between the flow velocity and turbulence intensity and the naphthenic acid corrosion rate is represented so as to realize construction of a naphthenic acid corrosion prediction model. And furthermore, a naphthenic acid corrosion condition is predicted in actual production so that the purposes of corrosion evaluation of high-acid crude oil refining equipment, prediction of the service life of the equipment and effective guiding of material selection, design and structure optimization of a refining device structure are achieved.

Description

technical field [0001] The invention relates to the determination of factors affecting the corrosion rate of naphthenic acid, in particular to a method for determining the factors affecting the corrosion rate of naphthenic acid by flow velocity and turbulence. Background technique [0002] Naphthenic acid corrosion is a common form of equipment corrosion in the process of refining high-acid crude oil. It often occurs in the high-speed washing parts where naphthenic acid generates turbulent flow in refinery equipment, such as distillation towers and oil transfer lines. Since the discovery of naphthenic acid corrosion in the 1920s, oil refineries have adopted methods of improving equipment performance, process, adding corrosion inhibitors and mixing to reduce corrosion. Naphthenic acid corrosion in some areas is still serious. For oil refineries, naphthenic acid corrosion has brought huge hidden dangers to the stable operation of equipment and personnel safety. Therefore, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
CPCG01N17/00
Inventor 饶思贤华晓春赵丽卓小文马涛张肖飞王孝义
Owner ANHUI UNIVERSITY OF TECHNOLOGY