Device and method capable of changing incidence angle and used for simulating measuring of erosion corrosion speed of flow on pipeline

Abstract

The invention discloses a device and a method capable of changing an incidence angle and used for simulating measuring of erosion corrosion speed of flow on a pipeline. The device comprises a sample and a test medium nozzle. The sample and / or the test medium nozzle are / is provided with an angle adjusting device, an adjusting angle between a spraying direction of the test medium nozzle and the surface of the sample ranges from 0-90 degrees, and the erosion corrosion speed of the flow on the pipeline is simulated by changing the incidence angle. The method is applicable to a pipe flow method or a spray method for conducting erosion corrosion tests on all portions of the pipeline. The erosion corrosion speed of all portions of the pipeline can be simulated and measured, and a determining method of invalidation possibility in risk evaluation under a corrosion environment such as pipeline high-temperature naphthenic acid is scientific and reasonable.

Description

technical field [0001] The invention relates to a technology for simulating and measuring the scouring and corrosion rate of fluids to pipelines, in particular to a device and method for simulating and measuring the scouring and corrosion rates of fluids to pipelines with variable incident angles. Background technique [0002] As the deterioration of crude oil quality continues to intensify, the crude oil processed by various refineries contains more and more corrosive impurities such as naphthenic acid and sulfur, resulting in more and more serious corrosion of equipment and pipelines. When performing RBI (Risk Based Inspection) assessment, the high temperature naphthenic acid corrosion rate given in API581 is only related to material, temperature, flow rate and naphthenic acid concentration. [0003] There are mainly two types of high temperature naphthenic acid corrosion test devices in the prior art: pipe flow method and spray method. The tube flow method is to place th...

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Problems solved by technology

[0006] Pipelines are composed of straight pipes, elbows, tees, and large and small pipe fittings. In the straight pipe section, the fluid flow direction is parallel to the inner surface of the steel pipe (incidence angle is 0°). For standard pipe fittings of different specifications, The incident angles of different parts of the inner wall vary within the range of 0° to 90°. In the above-mentioned prior art, technicians have not realized the impact of the incident angle on the erosion and corrosion behavior of high-temperature naphthenic acid, so the experimental simulation is not changed. Therefore, the test results are only suitable for simulating the erosion-corrosion behavior of straight pipe sections, and the erosion-corrosion behavior of different parts on elbows with changing incident angles has not been systematically studied, which seriously affects the high-temperature naphthenic acid. Accurate judgment on the possibility of pipeline failure in the environment

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