Corrosion control method and device for online film formation of pipeline of oil refining and chemical device

Abstract

The invention relates to a corrosion control method and a device for online film formation of a pipeline of an oil refining and chemical device. The method comprises the following steps of: at the pipeline upstream needing the corrosion control, injecting a film forming matter to the pipeline from a drain valve of the pipeline; and heating the pipeline needing the corrosion control to 200-500 DEG. C, and keeping the temperature for 1-240 hours; and generating a coke film on the inner surface of the pipeline needing the corrosion control. The invention also provides the corrosion control device used in the method, which comprises injecting equipment, a heating casing and heating equipment; the heating casing is provided with a heating medium inlet and a heating medium outlet, and can be spirally wound on the outer surface of a petroleum hydrocarbon device or the pipeline; and the heating device is used for heating the heating medium. The coke film generated by the method is smooth and compact in the flow boundary layer of the inner surface of the pipeline, has stable chemical property, and can isolate the contact between the matters in the pipeline and the inner surface of the pipeline to realize the corrosion control action and ensure the long-period safe operation.

Description

technical field [0001] The invention relates to an anticorrosion method and device for online film formation of pipelines of oil refining and chemical equipment, and belongs to the technical field of petroleum equipment and pipeline anticorrosion. Background technique [0002] The anti-corrosion technology of pipelines in oil refining and chemical plants is one of the urgent problems in the petroleum industry. At present, the main anti-corrosion method is to coat the inner walls of equipment and oil pipelines with anti-corrosion materials to form anti-corrosion coatings. [0003] The forming process of oil refining and chemical plant pipelines with anti-corrosion coating is relatively complicated. Taking petroleum pipelines as an example, the forming process is: steel pipe incoming inspection → steel pipe surface preheating → shot blasting → steel sand and other impurities in the pipe are cleaned → Dust cleaning on steel pipe surface→medium frequency heating of steel pipe→el...

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Problems solved by technology

[0003] The forming process of oil refining and chemical plant pipelines with anti-corrosion coating is relatively complicated. Taking petroleum pipelines as an example, the forming process is: steel pipe incoming inspection → steel pipe surface preheating → shot blasting → steel sand and other impurities in the pipe are cleaned → Dust cleaning on steel pipe surface→medium frequency heating of steel pipe→electrostatic spraying of epoxy powder→hot extrusion winding (coating) of primer→hot extrusion winding (coating) of outer polyethylene layer→water cooling forming→groove forming of finished anticorrosion layer→ Stacking of finished pipes → transportation of finished pipes, high cost of anti-corrosion

Moreover, once the anti-corrosion coating is damaged, it cannot be repaired, and it must be stopped to replace the pipeline, which will significantly increase the cost and affect the normal production

[0004] There are also many problems in the formed anti-corrosion coating, such as warping of the coating at the end of the steel pipe, hemispherical or semi-ellipsoidal bulging on the coating surface, uneven pitting, thinning or cracking of the coating at the weld, and corrosion resistance. Coating bulges, which seriously affect the apparent quality and anti-corrosion effect of the protective coating

Especially for petroleum hydrocarbons, its components are relatively complex, and various corrosive substances are combined together, which is very corrosive. The high-temperature corrosion resistance of petroleum processing equipment is especially important. The current method of coating anti-corrosion materials to form anti-corrosion coatings, It cannot meet the anti-corrosion requirements of oil refining and chemical equipment

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