​Operational Reliability and Installation Foundation of High-Temperature Boiler Centrifugal Fans

Operational Reliability and Installation Foundation of High-Temperature Boiler Centrifugal FansHigh-temperature boiler centrifugal fans operate with minimal oil consumption, delivering fresh air output. Compared to high-temperature boiler centrifugal fans and medium-pressure fans, they generate significantly higher pressure—typically over ten times greater. Current pressure ratings reach up to 230 kPa. When the pump body of the high-temperature boiler centrifugal fan is an integrated concave mold, the use of impact-resistant mounting brackets allows for an extremely low installation base. They can operate normally even without fixed brackets, thereby reducing installation costs and shortening the installation cycle. Compared to other types of high-end fans, their operational noise is low, with greater power yielding more pronounced effects. Models above 5.5KW qualify for free maintenance. With only two bearings as wear points, repairs are virtually unnecessary during the warranty period. Mechanical wear in high-pressure fans is minimal, featuring no mechanical contact components beyond the bearings, resulting in exceptionally long service life. Under normal operating conditions, 3 to 5 years of trouble-free operation is assured. This durability is a primary reason for the widespread adoption of high-pressure fans in China. The sealing performance of high-temperature boiler centrifugal fans is a critical indicator of operational reliability, particularly when transporting toxic, hazardous, flammable, explosive, or inert gases. However, if seals fail, not only will significant amounts of valuable gas be lost, but severe environmental pollution may also occur. Therefore, seal operation must never be compromised. Labyrinth seals and those termed "Kum seals" are widely employed in fan products. Labyrinth seals are primarily used for stepped seals in fan products, while labyrinth seals also serve as shaft-end seals for air transportation. Floating ring seals utilize the pressure oil film formed between the main shaft and floating ring, along with the equilibrium between the combined pressure of the oil film and external load (working medium pressure), to seal axial leakage of the working medium. Due to the self-sensing advantage of floating ring seals, the sealing gap can be reduced to minimize leakage. The pressure within the seal body can be adjusted according to the pressure of the sealed medium, and the floating ring and shaft can maintain contact to prevent mechanical wear. These seals are employed in high-pressure applications or when transporting corrosive gases to prevent leakage of the conveyed gas.