How to reduce the noise of diesel generator set?

Every diesel generator set will produce a lot of noise after starting. In order to reduce the noise, many diesel generators purchased in schools, hospitals, hotels and other places have added mute speakers, which can appropriately reduce the noise of diesel generators. However, the cost of mute speakers is high. For example, the price of a 30kw diesel generator is basically the same as that of a mute speaker, which invisibly increases the cost and many enterprises cannot afford it. How to reduce the noise of diesel generator set better and more economically? Huaquan Electric Power will teach you a few tricks. 1. Reduce exhaust noise. Exhaust noise is the main noise source of the unit, which is characterized by high noise level, fast exhaust speed and difficult control. The exhaust noise can generally be reduced by 40-60 db (a) by using a compound muffler with special impedance. 4. Reduce the noise of axial fan. Two problems must be considered when reducing the noise of the cooling fan of the generator set. One is the allowable pressure loss of the exhaust port. The second is the required noise reduction. In view of the above two points, you can choose the baffle muffler. 3. Sound insulation and sound absorption treatment of the machine room and vibration isolation (1) of the machine room unit. After the exhaust noise and cooling fan noise are reduced, the remaining main noise sources are diesel engine mechanical noise and combustion noise. The method adopted is to remove all the internal walls connected with the observation room except the necessary windows outside the observation window, all the holes should be sealed tightly, and the sound insulation of the brick wall should be above 40 db (a). The computer room adopts fire-proof and sound-proof doors and windows. (2) Air intake and exhaust. After the sound insulation treatment of the computer room, the ventilation and heat dissipation of the computer room should be solved. The air inlet should be set in the same straight line with the generator set and the air outlet. The air inlet shall be equipped with a resistor muffler. Because the pressure loss of the air inlet is also within the allowable range, the air flow in and out of the machine room can be naturally balanced, and the ventilation and heat dissipation effect is obvious. (3) Sound absorption treatment. The five walls in the machine room except the ground can be used as sound absorption treatment. According to the frequency spectrum characteristics of the generator set, the perforated plate vibration sound absorption structure is adopted. (4) The communication of indoor air and good sound insulation in the machine room will make the air in the machine room not convection when the closed water-cooled generator set stops, and the indoor high temperature cannot be reduced in time. This problem can be solved by using low noise axial flow fan and resistive muffler. (5) Vibration isolation of the unit. Before the installation of the generator set, the vibration isolation treatment should be carried out in strict accordance with the relevant information provided by the manufacturer to avoid the long-distance transmission of structural sound, which will continuously radiate air sound during the transmission process, so that the noise level at the factory boundary can not meet the standard.