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一、概况在大型化肥厂中,锅炉、加热炉和压缩机的安全阀放空,以及工艺操作开、停车时蒸汽或工艺气的放空常常产生很大的噪声。例如我厂尿素装置的高压系统在开车投氨前需用压力约90公斤/厘米~2左右的二氧化碳气升温钝化,大量的二氧化碳气体,从尿素合成塔排入大气,发出震耳的噪声,其值高达115-121分贝(A)。这些放空噪声的特点是声级高[在喷口附近声级达110-150分贝(A)]、频带
I. Overview In large-scale fertilizer plants, boilers, furnaces and compressors safety valve venting, and process operation open, stop steam or process gas vent often have a lot of noise. For example, the high-pressure system of urea plant in our factory needs to be heated and passivated by carbon dioxide gas with a pressure of about 90 kg / cm ~ 2 before driving the ammonia. A large amount of carbon dioxide gas is discharged into the atmosphere from the urea synthesis tower, Its value is as high as 115-121 dB (A). These bleed noise is characterized by high sound levels [sound level up to 110-150 dB (A) near the spout], frequency band