Noise Reduction Treatment for Diesel Generator Sets

Two approaches are taken to address the noise of diesel generator sets: either stopping the noise reduction in the diesel generator room or purchasing soundproofing models (with noise levels between 80db and 90db) based on the previous noise analysis of diesel generator sets.

The noise reduction requirements for the server room have been addressed, with the following methods implemented to deal with the respective sources of noise:

One: Airflow and Noise Reduction: Insulating walls are installed in the intake and exhaust channels of the server room, with sound-absorbing panels set inside. There is a buffer zone with intervals within the channels, which helps to reduce the intensity of noise emitted from the server room to the outside.

To control mechanical noise: High-absorption and sound-insulating materials are laid on the ceiling and surrounding walls of the machine room, primarily used to eliminate indoor echo and reduce the sound energy density and reflection intensity within the room. To prevent noise from radiating outward through the main entrance, fire-resistant and sound-insulating iron doors are installed.

Three: Controlling Exhaust Smoke Noise: The exhaust system is equipped with a special secondary silencer on the foundation of the existing primary silencer, ensuring effective control of the exhaust noise from the unit. If the length of the exhaust pipe exceeds 10 meters, the pipe diameter should be increased to reduce the exhaust back pressure of the power generation unit. These measures can improve the noise and back pressure of the power generation unit, and after noise reduction treatment, the noise of the power generation unit in the machine room can meet the user's requirements from outside.

Basic methods for reducing noise and sound insulation in generators involve addressing the source and employing conventional noise reduction techniques; such as mufflers, soundproofing, absorption, and vibration isolation are effective methods.

1. Reduce exhaust noise. Exhaust noise is the main source of noise for the unit, characterized by high noise levels, rapid exhaust speed, and significant management challenges. By using specially designed impedance-type composite mufflers, the exhaust noise can be reduced by 40-60 dB.

2. Reducing Axial Fan Noise. When reducing the noise of a generator set cooling fan, two key considerations must be addressed: first, the allowable pressure loss in the exhaust channel, and second, the required noise reduction level. In response to these points, a resistive plate-type silencer can be selected.

3. Acoustic isolation and absorption treatments for server rooms, as well as equipment vibration isolation

(1) Soundproofing of the machine room. After the exhaust noise and cooling fan noise of the unit are reduced, the remaining primary noise sources are the mechanical noise of the diesel engine and the extinguishing noise. The measures taken include removing all windows except for the necessary observation windows that connect to the observation room, sealing all holes and openings tightly, and ensuring the brick wall has a soundproofing level of over 40 dB. Fire-resistant and soundproof doors and windows are used for the machine room.

(2) Air Intake and Exhaust. After the soundproofing treatment of the machine room, the ventilation and heat dissipation issues within the room must be addressed. The intake and exhaust outlets should be set on the same uninterrupted power supply line as the generator set. The intake should be equipped with a resistive sheet-type silencer. Since the pressure loss at the intake is also within the permissible range, it allows for the natural balance of air flow in and out of the machine room, resulting in an evident ventilation and heat dissipation effect.