In the atmospheric and vacuum distillation units of the petrochemical industry, corrosion occurs in the tube bundles of the heat exchangers used for treating crude oil and bottom oil. How can this corrosion be prevented?
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The image below shows the tube bundle of the heat exchanger in the atmospheric and vacuum distillation unit of the petrochemical industry, used for the heat exchange of crude bottom oil. Model: FB700-60-40-2, Material: 10#, Operating conditions: Shell side: Sub-cooled four-line, temperature 358°C, pressure 0.67 MPa. Pipeline: Medium, initial bottom oil, temperature 279°C, pressure 2.04 MPa. The minus-four line is located in high-temperature areas and is subject to corrosion caused by high temperatures and sulfur, as well as naphthenic acid. The erosion of the anti-erosion plates at the inlet and outlet is quite severe. Take a look to see if there are any good protection methods.
To prevent high-temperature sulfur corrosion or naphthenic acid corrosion, the following measures can be considered: 1. Material selection: Use materials with better corrosion resistance, such as stainless steel, nickel-based alloys, or titanium alloys, to enhance the corrosion resistance of the heat exchanger tubes. 2. Corrosion-resistant coating: A high-temperature and chemical-resistant corrosion-resistant coating, such as a ceramic coating or special anti-corrosion paint, is applied to the surface of the tube bundle. 3. Corrosion protection design: Optimize the design of the heat exchanger, enhance the corrosion resistance of impact protection plates, use more wear-resistant materials, or apply special treatments to areas prone to corrosion. 4. Regular inspection and maintenance: Periodically inspect and maintain the heat exchanger, replace components that are severely corroded in a timely manner, and monitor the corrosion process to enable prompt corrective actions. Through these methods, the corrosion progression of the heat exchange tube bundle in the crude oil dewaxing heat exchanger can be effectively slowed down. .