Abstract: The noise sound pressure level of diesel generator sets is relatively high. When the speed of the diesel generator set is high, its sound frequency is also high. Therefore, to ensure that the diesel generator room and its surrounding rooms meet the allowable sound pressure standards, effective measures must be taken for noise reduction.

The noise reduction of diesel power plants should first actively reduce the generation of noise, such as vibration reduction of machinery and equipment; The installation of various equipment meets the requirements, reducing unnecessary impact and noise generation; Correct debugging to ensure normal operation of the unit and reduce noise caused by unstable operation. Secondly, sound-absorbing materials and silencers are used to attenuate and reduce the sound pressure level of the generated noise. Finally, the method of blocking and isolating can also be used for sound insulation. The following mainly introduces the use of sound-absorbing materials and silencers for noise reduction.

1. Use sound-absorbing materials to reduce noise

Any material in nature can absorb sound, but its sound absorption effect varies greatly. Therefore, sound-absorbing materials do not refer to all materials with sound absorption ability, and should be based on the material's sound absorption coefficient α It depends on the size.

When sound wave energy comes into contact with materials, a portion of the incident sound energy is reflected, a portion continues to propagate through the material, and a portion is absorbed by the material and converted into thermal energy. Using sound absorption coefficients separately α、 reflection coefficient β、 The transmittance coefficient r represents the distribution of sound energy in these three parts. Obviously, any material that has α+β+τ= 1. Sound absorbing materials refer to α＞ 0.2 material. The biggest characteristic of sound-absorbing materials is their looseness and porosity. For example, glass wool, slag wool, foamed plastic, sound absorbing brick, aerated concrete, wood wool board, etc. are all good sound absorbing materials.

Ground diesel power plants usually have many doors and windows, and are far from the work area, so they generally do not require any noise reduction measures. In underground diesel power plants, treatment is required. For example, applying sound-absorbing materials on the walls of a diesel generator room. But in general underground engineering, sound-absorbing materials are rarely used to reduce noise, and instead walls are roughened to reduce the reflection coefficient β， Improve sound absorption coefficient α。

When using sound-absorbing materials in underground engineering, in addition to considering their sound absorption performance, they must also be required to have fire, moisture, and mold resistance. Underground engineering often uses waterproof ultra-fine glass wool felt and water glass expanded perlite sound-absorbing products as sound-absorbing materials. These two types have a high sound absorption coefficient (0.6-0.9), as well as flame retardancy, moisture resistance, and mold resistance.

2. Silencer

Diesel generators in diesel power plants usually need to be equipped with silencers.

The function of a muffler is to reduce the impact of smoke exhaust airflow and the sound pressure level of noise. The muffler consists of an outer shell, a partition, and an inner tube. The working principle is that when high-pressure exhaust gas is discharged from the cylinder and passes through the muffler, it first diffuses and cools in the empty cylinder of the shell, causing a decrease in airflow speed. Then, it is obstructed through small holes, causing the airflow speed to be slower. As a result, the exhaust gas discharged from the outlet of the muffler is slower and smoother, reducing the impact phenomenon and achieving the goal of reducing noise.

Some projects do not have randomly equipped silencers, but instead set up diffusion chambers in the smoke exhaust system, which also play a role in noise reduction. Of course, its main function is to prevent the harm caused by external shock waves to the machine.

In addition, there are various types of mufflers in the ventilation system, such as pipe mufflers, folding plate mufflers, acoustic flow mufflers, resonant mufflers, perlite chamber mufflers, and air outlet mufflers. These silencers are mainly used in air-conditioned rooms and are usually not used in diesel power plants.

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