In the heat exchanger tube banks of the crude oil and vacuum distillation units in the petrochemical industry, there is significant corrosion in the tube side of the carbon steel tube banks; what anti-corrosion measures should be adopted?
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The image below shows the heat exchanger tube bank in the atmospheric and vacuum distillation unit of the petrochemical industry, for the crude bottom oil and light intermediate oil. Model FB900-215-40-2, material: 10#. Operating conditions: Shell side: crude bottom oil, temperature 260°C, pressure 2.23 MPa. Gangcheng: Medium, usually nitrogen; temperature 288°C, pressure 0.9 MPa. There is significant corrosion on the surface of the tube side of this tube bundle; what anti-corrosion measures would be appropriate?
Regarding the corrosion issue of the heat exchanger tube bundle as you described, it is recommended to adopt the following anti-corrosion measures: 1. Replace the material: Consider replacing the existing 10# carbon steel tube bundle with materials such as stainless steel or duplex steel, which have better resistance to high temperatures and corrosion. 2. Surface coating: A corrosion-resistant protective coating, such as an epoxy resin coating or a polyethylene coating, is applied to the surface of existing carbon steel pipes to prevent contact between the pipes and corrosive substances. 3. Cathodic protection: A cathodic protection system is used, either through sacrificial anodes or by applying electric current, to reduce the corrosion rate of steel. 4. Regular maintenance and inspection: Increase the frequency of regular maintenance and inspections to detect and address corrosion issues promptly, thereby preventing further expansion of corrosion that could lead to greater losses. The selection of the most appropriate method should be based on a comprehensive consideration of actual operating conditions and financial budget. .