氣體動力聲:以各類風機、風管道、蒸汽管道中高壓氣流運動、擴容、切 流、排汽、漏氣等而產生的低、中、高頻各類頻譜的混合而成。其中各種排汽為超高頻噪聲,對環境幹擾最為顯著。 


電磁聲:電動機、勵磁機、變壓器以及其它電器設備、磁場交變過程中產 生的低中頻噪聲。 

交通噪聲:廠區內運輸,以及其它運輸設備產生的噪聲,其中喇叭、汽笛 聲屬高頻噪聲。 

其它噪聲:水動力聲(如冷卻塔落水聲)、廣播、人類活動所產生的噪聲。 其中冷卻塔噪聲對廠界外環境的影響較大,且治理難度也大。目前許多廠界噪聲不能達標的電廠,多數是由於冷卻塔的噪聲所致。




在設計中盡可能選用低噪聲設備,對磨煤機、汽輪機等設備設隔聲罩,送風 機送風口和鍋爐排汽口裝設消音器,可減小設備的噪聲強度。 


在廠區總體布置時,將噪聲源較集中的主廠房布置在廠區中部,其它主要噪 聲源亦盡可能遠離廠界,減少電廠工業噪聲對外環境的影響。



Noise problems

Mechanical power noise: it refers to the low and medium-frequency noise caused by running, vibration, friction and collision of equipment.  
Pneumatic power noise: it refers to the low, medium and high-frequency noise caused by high-pressure airflow, capacity expansion, tangential flow, exhaust steam, and air leakage in various sorts of fans, air ducts and steam tubes, among which the exhaust steam produces high-frequency noise and has remarkable influence on environment.
Combustion noise: it refers to the low and medium-frequency noise caused in the processes of combustion, vaporization, exhaust gas movement and convection in boiler.
Electromagnetic noise: it refers to the low and medium-frequency noise caused by motor, exciter, transformer and other electrical equipments in the alternating process of magnetic field.
Traffic noise: it refers to the noise caused by the transportation vehicles within the factory, among which the horn sound and the siren are of high-frequency noise.
Other noise: it refers to the noise caused by hydrodynamic force (such as the sound of cooling tower), broadcast and human activity, among which the noise of cooling tower has huge influence on the environment outside of the factory, and is hard to control. Currently,  as for most power plants which noise produced within the factory boundary fails to meet the noise control requirement , most of its noise is caused by the cooling tower.


Control over Equipment Noise
    The low-noise equipment must be given priorities as much as possible when designing; and the sound insulation hood to be particularly installed for the coal mill, steam turbine and other equipment, and  mufflers to be installed at the air supply outlet of draught fan and the exhaust gas outlet of boiler to reduce noise strength.

Rational layout
    When designing the overall layout, the buildings producing too much noise can be arranged in the center of the factory, the other noise sources can be arranged far away from the factory boundary; such layout and arrangement can help minimize the influence of industrial noise on external environment.