Anti-corrosion performance of the tube bundle on the circulating water side of water coolers in petrochemical coking units
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The image below shows the bottom heater of the stripper in a petrochemical reforming unit. Corrosion condition of the outer wall of the tube bundle. The structural type is floating head, model F1200-430-10-4. The tube bundle is made of 20# steel, and the operating medium is the solvent outside the tube bundle. Temperature 140 degrees, pressure 0.07 MPa. The inner wall of the tube bundle is: the operating medium is diesel inside the tube bundle. Temperature 257 degrees, pressure 0.65 MPa. This tube bundle has been in use for over 2 years, and a large amount of rust has accumulated on the solvent side of the shell side, affecting its service life. Given this situation, detailed work is required to consider options such as upgrading the material or using coating treatments for corrosion protection.
Considering the operating conditions and corrosion levels to which the bottom heater of this stripping tower is exposed, it is recommended to carry out the following actions: 1. Material upgrade: Consider replacing 20# steel with materials that have better high-temperature resistance and corrosion resistance, such as stainless steel or duplex steel. 2. Coating application: An anti-corrosion coating is applied to the outer wall of the tube bundle; a coating resistant to high temperatures and chemical erosion is chosen to provide an additional protective layer. 3. Regular inspection and maintenance: Establish a regular inspection schedule to monitor the corrosion of the tubes and remove rust promptly, in order to extend their service life. These measures can effectively prevent further corrosion and enhance the stability and safety of the equipment. .