The noise reduction of generator room

The noise reduction of generator room
When diesel generator is running, usually produces 95 ~ 128 db (a) of the noise. If you do not take the necessary noise reduction measures, the unit will run the noise caused serious damage to the surrounding environment. To protect and improve the quality of the environment, you need control noise.
Diesel generators are the main noise sources produce diesel engines, including exhaust noise, mechanical noise and combustion noise, cooling fan and exhaust noise, into the wind noise, generator noise, ground vibration generated by the transmission of noise:
1, the exhaust noise. Exhaust noise is a high temperature, high-speed pulse of air noise, engine noise is a maximum of energy, up to 100 db above the noise, the total engine noise is the most important part. generator exhaust noise generated when the work by the simple exhaust pipe (exhaust pipe generator first wife) direct discharge, and with the air speed increases, the noise frequency is also significantly improved, so that nearby residents living and working are not severely affected.
2, mechanical noise and combustion noise. Mechanical noise is mainly the engine moving parts during operation by the gas pressure and inertia forces caused by changes in the cycle of vibration or shock generated by each. It has spread far from the noise, reduce bad characteristics. Diesel combustion noise is generated in the combustion process structure vibration and noise.
3, the cooling fan and exhaust noise. Unit fan noise is the noise from the vortex, rotating noise and mechanical noise component. Exhaust noise, air noise, fan noise, mechanical noise will be spread out through the exhaust channel, thereby causing noise pollution on the environment.
4, into the wind noise. The role of the inlet channel is: to ensure the normal operation of the engine and the unit itself to create a good thermal conditions. Unit into the air inlet channel must be able to smoothly enter the room, but the unit of mechanical noise, the noise will air through the inlet channel of radiation to the room outside.
5, the transmission of ground vibration noise. Diesel strong mechanical vibrations can be transmitted long distances through the ground around the outside and then re-radiated noise floor.
Diesel generator room noise reduction principle is to ensure that the ventilation of diesel generators do not reduce the output power of the premise, the use of efficient sound-absorbing materials and noise muffler for Jin, ventilation channels and exhaust system for noise reduction, so that noise emissions to achieve the national standard (85db (a)).
Noise generator is the most fundamental way to proceed from a sound source, the use of some conventional noise reduction techniques; such as mufflers, sound insulation, sound absorption, vibration isolation, etc. are the most effective way.
1, reduce exhaust noise. Exhaust noise is the main noise source unit, which is characterized by high noise levels, exhaust speed, control is difficult. Impedance using a special type of compound muffler, exhaust noise will generally reduce the 40-60 db (a).
2, lower axial fan noise. Reduce the generator cooling fan noise, we must consider two questions, one exhaust channel pressure loss allowed. Second, muffler requirements. In response to these two points, the choice of the resistive film type muffler.
3, room acoustic, acoustic treatment and isolation unit
(1), room noise. Unit and cooling fan noise, exhaust noise reduction, the remaining major noise source is the diesel engine mechanical noise and combustion noise. Approach is necessary in addition to the observation room connected with the interior observation window, the other windows were removed, all holes, the hole to compact block, brick wall of sound insulation required to be 40 db (a) above. Engine room sound insulation, fire-resistant doors and windows doors and windows.
(2), inlet and exhaust. Room acoustic treatment, the engine room ventilation to solve the problem. Air inlet should be generating sets, air vents set in a straight line. Air inlet should be accompanied by a resistive film type muffler, air inlet pressure loss due also within the permissible range, the engine room can balance out the natural air flow, ventilation and heat dissipation effect is obvious.
(3), acoustic treatment. In addition to the engine room on the ground outside the wall can be used for five acoustic treatment, according to the spectral characteristics of generators using resonant acoustic perforated board structure.
(4), the exchange of indoor air, a good room sound insulation, water-cooled generator set will shut down time closed room without air convection, room temperature can not be down in time, can be low-noise axial fan , matched resistive film muffler can solve the problem.
(5), unit isolation. Generator installation, should be strictly according to the manufacturer for isolation provided information processing, to avoid long-distance propagation of acoustic and continue to spread radiation in the air sound, noise level can not make the plant community standards.Exceeded the requirements of governance due to the existing generating units, the unit must be measured near the ground vibration, if vibration sense was, the first isolation of generating units for processing.
Reduction in the effective noise, in order to make the environment more beautiful and functional room, typically the walls and ceiling with sound-absorbing layer of porous aluminum punching things, decorative plates, while the rational allocation of lighting systems.