| 摘要 |
PURPOSE:To reduce the noise generated at the top part of a smokestack caused by a fan and the like by a method wherein a silencer is installed in upright position on the base part inside of the smokestack. CONSTITUTION:A lining material 2 is provided on the steel plate cylindrical body 1 of a smokestack, the smokestack is fixed on a base 6 made of reinforced concrete with anchor bolts 5a via base plates 3. A cylindrical silencer 20 having sound absorbing performance is fixed on the base 6 with anchor bolts 5b via a base plate 4 in the inside A of the smokestack. A conical cap 7 having a bottom surface of which diameter is slightly larger than the external diameter of the silencer 20 is covered on the top part of the silencer 20, accordingly, the surface of the silencer 20 is protected from direct contacting to a rainwater during the operation stopping time of the smokestack. Thereby, all noises generated in a duct system and from the smokestack to the flue fixing part can be reduced. |
