Failures of Wear-Resistant High-Pressure Centrifugal Fan Impellers and Remedial Measures

Failures of Wear-Resistant High-Pressure Centrifugal Fan Impellers and Remedial Measures

When the impeller of a wear-resistant high-pressure centrifugal fan operates for an extended period, it is inevitable that various forms of corrosion and wear will occur. These are generally categorized as impeller corrosion, impeller wear, dust accumulation on the impeller, and exposure to high-temperature gases. Please provide a detailed explanation of the remedies for each type of damage. 1. Corrosion Mitigation Measures. Corrosion in wear-resistant high-pressure centrifugal fans is not limited to those handling corrosive gases such as CO₂ and chlorine; it is also common in fans processing exhaust gases containing various contaminants, and can occur unpredictably at any time. The following are the methods for addressing impeller corrosion in wear-resistant high-pressure centrifugal fans. (1) Re-evaluate the composition of the gas medium and the materials used. (2) CO₂ and chlorine gases are relatively dry, but there are few corrosion-resistant materials available for them. It is necessary to check for adverse operating conditions, such as the presence of water, and take appropriate measures. (3) Check whether the anti-corrosion coating has peeled off. Coating materials include metallic coatings made of thin stainless steel sheets, liquid metal spraying, and metal spraying, as well as non-metallic coatings made of paints, rubber, and plastics. If the rotor becomes unbalanced and excessive vibration occurs due to corrosion, emergency repairs are typically performed using ordinary steel. However, since fan blades are rotating components, they should be replaced as soon as possible with metal materials that offer wear and corrosion resistance. 2. Please implement remedial measures. When the blades of wear-resistant high-pressure centrifugal fans suffer severe wear, they should be treated as vulnerable components. Examples include wear-resistant high-pressure centrifugal fans used in steel mill combustion furnaces, various wear-resistant high-pressure centrifugal fans in cement plants, and wear-resistant high-pressure centrifugal fans for transporting various powders. In addition, boiler exhaust fans are increasingly becoming types that require wear-resistance measures. To reduce wear, measures such as reducing dust levels and optimizing the impeller shape are necessary; however, reducing the impeller’s peripheral speed is an effective method.