Corrosion and anti-corrosion recommendations for induced draft fans in petrochemical heating furnaces
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The following images show the ash accumulation and corrosion on the surface of the induced draft fan duct in the reforming unit’s heater. The flue gases generated during the combustion in the heating furnace contain gases such as SO2, SO3, NOX, and HCl. Due to the presence of moisture in these gases, highly corrosive solutions such as H2SO4 and HCl can be formed instantly. Metals suffer severe corrosion at low temperatures. After low-temperature corrosion occurs, it causes corrosion of the metal surface; in a carbon steel plate with a wall thickness of 10 millimeters, local corrosion can lead to perforation within less than a year, while the entire component can still be used for about two years. Therefore, for equipment used in such an environment, applying a coating can be an effective solution.
To address the corrosion issue of the exhaust fans in petrochemical heating furnaces, the following anti-corrosion measures are recommended: 1. Use corrosion-resistant coatings for surface treatment to enhance the metal’s resistance to corrosion. 2. Regularly inspect and maintain the equipment, promptly remove dust and scale to reduce sources of corrosion. 3. Consider increasing the flue gas temperature to reduce the occurrence of low-temperature corrosion. 4. Use appropriate materials, such as stainless steel or alloy materials, to replace carbon steel in order to improve corrosion resistance. 5. Install online monitoring equipment to monitor corrosion in real time, so that appropriate measures can be taken promptly. Through the above measures, the corrosion risk of the induced draft fan can be effectively reduced, thereby extending the equipment’s service life. .
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