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Home Service FAQs FAQ of coal-fired boilers What causes the fan bearing to vibrate during boiler operation?

What causes the fan bearing to vibrate during boiler operation?

09 May 2025

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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