Corrosion and scaling prevention in air preheaters of petrochemical heating furnaces
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This post was last edited by Wang Wei2 on 2024-7-18 at 10:45. The image below shows the corrosion and scaling that occur on the surface of the heat tubes in the air preheaters of petrochemical heating furnaces, where no anti-corrosion measures have been taken; these heat tubes are of ND steel and come in finned design. The operating conditions are a flue gas temperature of 150 degrees, with heat exchange with air (30 degrees in summer and -15 degrees in winter). More than 1 year after use, the surface of the fins was covered with scale, and the metal surface beneath it was corroded. Therefore, it is recommended to apply corrosion protection to equipment used under such conditions.
In the air preheaters of petrochemical heating furnaces, due to operating conditions involving high-temperature flue gas and temperature differences in the air across different seasons, finned heat pipes made of ND steel are prone to scaling and corrosion. Therefore, it is recommended to take anti-corrosion measures for such equipment in order to extend its lifespan and maintain its efficiency. .