In high-temperature or highly corrosive applications, fan sealing and lubrication systems face challenges such as dynamic leakage, lubricant failure, and accelerated component aging. This article systematically introduces reliable solutions—from seal type selection, high-temperature sealing materials, corrosion-resistant lubricants, to online monitoring—to ensure long-term, safe fan operation in demanding conditions.
1. Environmental Challenges and Needs
High Temperature: In applications like flue gas, desulfurization, and metallurgy, temperatures can reach 200–400 ℃, quickly causing standard seals and lubricants to fail.
Corrosive Media: Acidic, alkaline, or chloride-containing exhaust can corrode metal parts and lubricant films.
Operational Reliability: Leaks not only reduce efficiency but may trigger safety incidents; insufficient lubrication leads to bearing and gear wear.
2. Sealing Technology Selection
Mechanical Seal:
SiC/Ceramic Faces: Offer excellent wear and corrosion resistance at high temperatures.
Double-face, Independent Lubrication: Buffer media (high-temp nitrogen or oil mist) isolate the process gas; works with leak detection systems.
Packing Seal:
Graphite Fiber Packing: Withstands up to 450 ℃, tolerates minor leakage.
PTFE Liner: Chemically resistant and low friction; must be paired with metal skeleton for wear resistance.
Magnetic Seal:
Ideal for explosive or highly corrosive environments; non-contact design with zero leakage, aided by internal lubrication and cooling.
3. Lubrication Technology Configuration
High-Temp Grease:
Synthetic Silicone Grease: Suitable for 200–250 ℃, resists oxidation and evaporation.
PFPE Grease: Endures over 300 ℃, stable in acids, alkalis, and steam.
Solid Lubricant:
Graphite/MoS₂ Coating: Forms a self-lubricating layer at extreme temperatures.
Lubricant Powder/Film: Used with spray or immersion to boost surface wear resistance.
Automatic Lubrication Systems:
Circulating Oil Cooling: Hot oil is pumped to an external heat exchanger then returned, controlling oil temperature and viscosity.
Online Grease Supply: Feeds lubricant based on vibration/temperature feedback, preventing under- or over-lubrication.
4. Online Monitoring & Maintenance
Seal Leakage Monitoring: Differential pressure and gas sensors provide real-time seal failure alarms.
Temperature & Vibration Monitoring: Bearings equipped with thermocouples/vibration sensors, linked to PLC/SCADA for alarms.
Lubricant Analysis: Regularly check viscosity, acid value, and impurities to detect fatigue or contamination.
Preventive Replacement: Replace seals and lubricants before end-of-life based on monitoring and manufacturer guidelines.
5. Summary & Recommendations
Custom Solutions: Select sealing type and lubricant according to maximum temperature, corrosion level, and maintenance cycle.
Multiple Safeguards: Combine double-face mechanical or magnetic seals with packing seals to reduce single-point failures.
Smart O&M: Use online monitoring and automatic lubrication for early warning and accurate supply.
Training & Drills: Ensure operators are trained in inspection and safety procedures for high-temp/corrosive environments.
By integrating these sealing and lubrication technologies, you can significantly improve fan reliability and service life under high-temperature and corrosive conditions, supporting stable operation of industrial ventilation systems.