Performance Analysis and Common Issues of Corrosion-Resistant Duct Fans and Centrifugal Compressors

Performance Analysis and Common Issues of Corrosion-Resistant Duct Fans and Centrifugal CompressorsMany customers may think that corrosion-resistant duct fans and centrifugal compressors are very similar, but in fact, they are different. Next, we will analyze the performance and common issues of corrosion-resistant duct fans and centrifugal compressors. Performance Analysis and Common Issues of Corrosion-Resistant Duct Fans and Centrifugal Compressors 1.1. A corrosion-resistant duct fan is a type of fluid-handling machinery that relies on input mechanical energy to increase gas pressure and transport gas. Centrifugal compressors, also known as radial compressors, are turbine compressors in which the discharge pressure exceeds 0.015 MPa and the flow is primarily radial. 2.2. Corrosion-resistant duct fans are widely used in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings for ventilation, dust removal, and cooling; in boilers and industrial furnaces for ventilation and airflow guidance; and in air conditioning equipment and household appliances for cooling and ventilation. They are also used in grain drying and sorting; as air sources for wind tunnels; and for expansion and propulsion in Hobakaf systems. Centrifugal compressors are widely used in a variety of processes to transport air, various process gases, or mixed gases, and to increase their pressure. 3.3. The operating principle of corrosion-resistant duct fans is essentially the same as that of turbine compressors. The low flow rate of centrifugal compressors is limited by surge conditions, while the flow rate is limited by choking conditions. Wear in the transmission components of centrifugal fans is a common issue in such equipment, such as wear at the bearing positions and bearing shafts of exhaust corrosion-resistant duct fans, as well as wear at the bearing positions of the fan shaft. In light of the aforementioned failures in corrosion-resistant duct fans, traditional maintenance methods include surface treatment, thermal spraying, and polishing. However, all of these methods have several drawbacks: they cannot completely eliminate thermal stress caused by high repair welding temperatures, which can easily lead to material damage, causing components to bend or break. Brush plating produces a coating limited by thickness and is prone to peeling. Furthermore, both of the aforementioned methods involve repairing metal with metal. Therefore, the “hardware-to-hardware” compatibility cannot be altered. Under the combined action of various forces, the rubber rollers will also wear out again. To address these issues, most Western European countries have adopted polymer composite repair methods, and the U.S.-developed “dumpling” technology system is widely used. This system possesses comprehensive properties such as adhesion and excellent compressive strength, and the material can be freely disassembled and processed. Not only does it eliminate welding thermal stress, but the repair thickness is also unrestricted. At the same time, the metal components of the product do not deform; they can absorb the machine’s impacts and vibrations, thereby preventing further wear. In China, where it is applied to the repair of corrosion-resistant pipeline fan failures, this method has gradually replaced traditional approaches.