Jet noise silencer

F - Mech Eng,Light,Heat,Weapons – 02 – K

Patent

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Details

F02K 1/44 (2006.01) F01D 25/30 (2006.01) F01N 1/08 (2006.01)

Patent

CA 2197721

A device is invented to attenuate excessive noise generated by a free jet during high pressure fluid (a gas or a vapor) release. The silencer consists of a chamber surrounded by perforated walls, and filled with a granular packing which creates large contact surface with the fluid flowing through the chamber. The high pressure energy of fluid is effectively dissipated by the friction between the fluid and the surface of solid packing. The fluid, before it enters the chamber, is swirled by motionless vanes in the silencer swirler. The swirling distributes uniformly the fluid through the granular packing in the chamber. The fluid flow rate can be controlled by the valve installed upstream of the swirler. The flow rate during first period of blowdown can be kept constant in spite of the pressure drop of evacuated fluid. This option of the controlled fluid rate would allow for small size of the silencer without increasing time required for full discharge of the fluid, so the silencer is amenable to portable application. The jet noise silencer can find application in the installations operating with high pressure, e.g., power plants, chemical plants, pipelines systems, cryogenic facilities, compressor stations, etc.

Dispositif visant à atténuer les bruits excessifs produits par un jet libre lors du dégagement d'un fluide (gaz ou vapeur) haute pression. Le silencieux se compose d'une chambre entourée de parois perforées et remplie d'un garnissage granulaire qui crée une importante surface de contact avec le fluide s'y écoulant. L'énergie du fluide haute pression est dispersée efficacement à cause de la friction entre le fluide et la surface du garnissage plein. Le fluide, avant d'entrer dans la chambre, est agité par des aubes fixes dans le diffuseur du silencieux. Le tourbillonnement permet de répartir uniformément le fluide dans le garnissage granulaire de la chambre. Le débit peut être commandé par le robinet installé en amont du déflecteur. Pendant la première période de purge, le débit peut être maintenu constant malgré la baisse de pression du fluide évacué. La possibilité d'obtenir un débit contrôlé pourrait permettre l'utilisation de silencieux de petite taille sans devoir augmenter la durée de vidange complète du fluide, de sorte que le silencieux est portatif. Le silencieux de bruit de jet peut servir dans des installations fonctionnant à haute pression, p. ex., les centrales, usines chimiques, systèmes de pipelines, installations cryogéniques, stations de compression, etc.

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