What causes the fan bearing to vibrate during boiler operation?
Why Fan Bearings Vibrate in ZOZEN Coal-Fired Boilers
Fan bearings (in FD/ID fans, primary air fans, etc.) are critical for stable combustion and heat transfer. Vibration indicates abnormal forces or wear, requiring prompt diagnosis to avoid failure. Below are key causes and ZOZEN-specific solutions:
Primary Causes of Fan Bearing Vibration
Imbalance
Cause: Coal dust/debris buildup on fan blades, uneven wear, or manufacturing tolerance deviations.
ZOZEN Solution: Dynamically balanced rotors at factory + anti-fouling blade coatings.
Bearing Wear/Damage
Cause: Lubrication failure (over/under-greasing), contaminants (ash, moisture), or fatigue from extended operation.
ZOZEN Engineering: Sealed bearing housings + automated lubrication systems on high-end models.
Misalignment
Cause: Improper coupling alignment between motor/fan shafts during installation or thermal expansion shifts.
ZOZEN Protocol: Laser alignment during commissioning + thermal growth compensation design.
Resonance & Structural Issues
Cause: Natural frequency matching between fan speed and support structure/ductwork.
ZOZEN Design: Stiffened bases, vibration isolators, and FEA-optimized structural dynamics.
Poor Lubrication
Cause: Incorrect grease type, degraded oil, or blocked lubrication channels.
ZOZEN Support: OEM-specified lubrication schedules + IoT sensors for real-time monitoring (optional).
Thermal Stress
Cause: Uneven heating/cooling warps shafts or housings.
ZOZEN Feature: Heat shields on bearings near high-temp zones (e.g., ID fans).
Electrical Issues (Motor Side)
Cause: Motor rotor imbalance, soft foot, or electromagnetic forces.
ZOZEN Integration: Certified motor-fan assemblies tested for vibrational harmony.
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