Noise Control Measures for Laboratory Graphitization Furnaces

2025-04-11 14:05:22

Slight noise is a normal operational condition during the production process of Graphitization furnaces. However, excessive noise typically indicates component malfunction, requiring systematic troubleshooting and targeted solutions. Prolonged exposure to high noise levels poses risks to employee safety and disturbs nearby residents. Below are the causes and mitigation measures for noise in laboratory graphitization furnaces:

I. Causes of Noise in Laboratory graphitization furnaces

Medium-Frequency Graphitization Furnace Issues

Upon startup, the voltage fails to rise adequately, accompanied by unusually loud, low-frequency humming or vibrations from the reactor. Intermittent overcurrent/overvoltage faults or inverter tube burnout may occur, often caused by reactor malfunctions.

Primary Noise Sources

Noise primarily originates from the medium-frequency power supply, furnace body, and hydraulic pumps. Secondary sources include transformers and water pumps, though their contribution is relatively minor.

High Power Density Effects

High-power-density furnaces generate significant noise due to vibrations in components such as induction coils and magnetic yokes during operation.

Thyristor Irregularities

Faulty thyristors in one phase may induce periodic oscillations, causing visible vibrations in copper busbars.

II. Noise Mitigation Measures for High-Temperature Graphitization Furnaces

Installation of Soundproof Doors

Requirement: Noise levels ≤85 dB (after deducting background noise) at 1 m height and 1 m distance from the furnace.

Solution: Install doors with >25 dB sound insulation, optimized for mid- to low-frequency noise reduction. Door frames and panels should undergo anti-corrosion treatment.

Noise Reduction in Heat Dissipation and Ventilation Systems

High-capacity fans for heat exhaust contribute major noise. To balance heat removal and noise control:

Deploy 2 intake silencers and 2 exhaust silencers.

Equip with low-noise axial fans for forced ventilation.

Furnace Vibration Damping

Mitigate vibrations from induction coils and magnetic yokes by:

Lining the furnace shell interior with acoustic damping materials.

Adding rubber gaskets to maintenance access panels.

Filling structural cavities with vibration-absorbing materials.

Reactor Vibration Suppression

Reduce reactor noise (from copper tube bundles and magnetic yokes) by potting reactors with insulating damping adhesive to minimize inter-turn vibrations.

Acoustic Treatment of equipment Room

Install sound-absorbing panels on walls and ceilings to eliminate reverberation. Key specifications:

Materials should prioritize mid-to-high-frequency absorption with >80% porosity and high flow resistance.

Seal penetrations (e.g., cables, pipes) to prevent noise leakage.

Conclusion

The above measures, developed by Hunan Hochi Medium & High Frequency Co., Ltd., address noise pollution from high-temperature graphitization furnaces. Excessive noise not only disrupts operator focus but also impacts surrounding communities. Implementing these solutions ensures compliance with occupational safety standards and minimizes environmental disturbance.