Looking at future maintenance trends from the corrosion protection of desulfurization pipelines

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In a company’s desulfurization tower, the desulfurization liquid pipeline welds were corroded and leaking, and the temperature: 30-40℃, pipe diameter: 700mm, material: Stainless steel 316L, medium: Desulfurization liquid and coke oven gas ； Previously, companies used a variety of plugging materials to repair leaks, but the results were unsatisfactory and seriously affected production safety. 1. Causes of Corrosion and Leakage of Desulfurization Pipelines During the manufacturing process of pipelines, due to manufacturing accuracy or process control, various defects often occur, such as pores, blisters, dark lines, etc. Such defects are difficult to detect with the naked eye and are often discovered during the pressure test process in the later stages of manufacturing. At this time, most of the processing and manufacturing has been basically completed, and a large amount of manufacturing costs have been incurred. At the same time, pipelines will also be affected by various environmental factors during use, including material factors, media corrosion, temperature and pressure, etc., which will cause blisters, cracks and leaks in the pipeline, and even thinning of the material wall thickness, affecting the normal use of the equipment. 2. Several methods for corrosion protection of desulfurization pipelines 1. Traditional repair process: Traditional repair processes for pipeline leakage problems often use repair welding after shutting down to relieve pressure or punching tools. However, due to problems with the pipe wall thickness, material, and medium, repair welding often has major limitations, and the punching tool method is not suitable for pipe fittings with complex structures. 2. Sole carbon nanopolymer material repair technology: This material repair can adopt different repair plans according to different media, temperatures, pressures and leakage conditions. The material's excellent pressure resistance and corrosion resistance properties can be used to repair the leakage site on site. On the basis of ensuring the repair effect, there is generally no need to shut down the pipeline to relieve pressure, and the repair cycle is short and easy to operate. With the progress and development of society, in order to adapt to changes and improve competitiveness, enterprises have introduced advanced equipment and strengthened the reform of technical projects. The original maintenance methods and technical resources have become increasingly unsuitable for the development of enterprises, and a large number of equipment parts have been scrapped and replaced. * * It increases the production cost of the enterprise and restricts the sustainable development of the enterprise. It is believed that in the future development, more environmentally friendly new materials will replace the original repair methods and appear on the stage of development with a high profile.