I would like everyone to discuss the noise control for air compressors

There are three main types of noise sources in air separation: a) mechanical noise, which includes noise generated by air compressors as well as gas and liquid expansion devices; b) pipeline noise, which is caused by turbulent flow of high-pressure gas passing through valves – this is a type of airflow noise, and such noise is radiated outward through the pipes following the valves. C. Air release noise also belongs to airflow noise.

The challenge in noise control projects lies in the fact that noise sources include point sources (such as pneumatic compressors), line sources (such as pipes), and surface sources (such as factory buildings). The noise level can exceed 120 decibels, and it is necessary to reduce it to below 85 decibels; thus, a significant level of noise reduction is required. In addition, low-frequency noise is present, which means that a comprehensive approach is needed, with multiple methods having to be employed.

Build a windowless compressor room, line the interior walls with sufficient soundproofing material, and the compressors can also be fitted with soundproof enclosures. The better the effect, the more money it will cost; the key is to see how much budget you have. Zone 65DBA is achievable as long as you have the money.

Fully enclosed soundproof enclosure for air inflation machines: A soundproof enclosure is used to cover the currently operating air inflation machines as well as those that will operate in the future. The sound insulation enclosure uses CA IA45 metal sound-insulating and sound-absorbing modules that are assembled on-site; one side of these modules is made of steel plate while the other side consists of metal perforated sound-absorbing panels. The interior of the modules contains materials for damping, sound insulation, and sound absorption, with the sound-absorbing materials being protected by a waterproof membrane, making them suitable for use outdoors. The modules themselves serve as load-bearing elements; the sound insulation enclosure does not require a beam and column structure. The modules are connected to each other using specialized sealing connectors, and the entire sound insulation enclosure is detachable, which facilitates equipment maintenance in the future. The CA IA45 sound-insulating and sound-absorbing module possesses sound-insulating and sound-absorbing properties; its sound-absorbing surface faces the inside of the sound-insulating enclosure, with a sound insulation level of 44 dB. Its sound-insulating and sound-absorbing characteristics are shown in the table below:

Acoustic properties of CA IA45 metal sound-insulating and sound-absorbing panels – Octave bands, Center frequency, in Hz: 63, 125, 250, 500, 1K, 2K, 4K, 8K. Sound-insulation index STC, Sound insulation level, in dB: 27, 30, 32, 41, 50, 59, 67, 71. Sound absorption coefficient: 0.94, 1.19, 1.11, 1.06, 1.03, 1.03, 1.04

b and c have little impact on the compressor noise, and it is also impossible to avoid them.

There’s no perfect solution; one option is to install soundproof enclosures or use the factory building itself for sound insulation – the building has double-glazed windows and sound-absorbing materials on the walls. We’ve taken measures, and the noise level outside the factory is still above 80, but it’s basically within acceptable limits

Soundproof enclosures are added to the air compressor body, and soundproof walls are installed around the heat exchanger

First, it is necessary to thoroughly examine the noise sources; identifying all the locations where noise is present and finding its root causes is of utmost importance. Only after that can a specific solution be designed. I specialize in this area; those who are interested can click on my profile to take a look