变电站降噪用吸声材料的研究

随着法律法规的严格及居民环保意识的增强,变电站噪声超标已成为变电站投诉的焦点问题之一.通过分析变电站的噪声特点及变电站降噪用吸声材料的性能,发现目前常用的变电站吸声材料并不能满足变电站的降噪需求和服役条件.为此,创造性地研制出了一种新型吸声材料——微孔纤维复合吸声板,该板以微穿孔板为外层,铝纤维板为内层,通过两者背后的空腔,组合成一种双共振吸声结构,极大地拓宽了材料的吸声频带,提高了材料的低频吸声系数.此外,该吸声板采用全铝结构,导热优良,耐候持久,回收利用方便,经济性良好,将其应用在南方某城市110 kV室内变电站的噪声治理中,大幅度降低了变电站的整体噪声水平.

Research on Sound-Absorption Materials for Substation Noise Reduction

With the strictness of laws and regulations and the enhancement of residents＇ environmental protection awareness,the problem of excessive substation noise has become the focus of substation complaint issues.This paper presents a study on the characteristics of substation noise and the property of the noise absorption materials.It is found that presently used sound-absorbing materials cannot meet the demand of the noise reduction and the service condition of substation.Therefore,microporous fiber composite acoustic board which is a new type of sound-absorbing material has been creatively developed.The board has two layers.The outer layer is the microporous acoustic board,while the inner layer is the aluminum fiber acoustic board.There are cavities behind the two layers,which can combine into a double-resonance structure to greatly broaden the absorption broadband of material and improve the low frequency absorption coefficient.In addition,the material of acoustic board is aluminum,which makes the structure have better properties of heat conduction,weather resistance,recoverability and economy.Applications of the microporous fiber composite acoustic board in a 110 kV indoor substation of one southern city have been conducted,the whole noise level of the substation has been reduced significantly.The microporous fiber composite acoustic board will be the ideal absorption material in substation noise control.