Active walls

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B - Operations, Transporting

08

B

B08B 17/06 (2006.01) A61M 15/00 (2006.01) B65G 53/52 (2006.01)

Patent

CA 2391888

A powder distribution device for transporting and mixing a fine powder with a gas is disclosed. The device presents a distribution member forming a connection between a source of fine powder and a discharge opening. The distribution member has a first inlet portion (10) and an outlet portion (12) for a stream of a first gas (1) mixed with the fine powder. The main body of the distributio member constitutes a porous body portion (16) being surrounded by a second gas (2). If a pressure gradient is created between the second gas (2) and the first gas (1), i.e., the first gas (1) being at a slightly lower pressure, the second gas (2) will leak through the porous body (16) and thereby preventing powder, in the mix of the first gas and fine powder, from sticking or clogging within the distribution member, which thereby forms an active non-sticking wall relative to of the fine powder.

L'invention concerne un dispositif de distribution de poudre pour le transport et le mélange d'une fine poudre avec un gaz. Un élément de distribution forme une connexion entre une source de fine poudre et un orifice d'évacuation. Cet élément a une première partie d'entrée (10) et une partie de sortie (12) pour un flux de premier gaz (1) mélangé avec la fine poudre. Le corps principal de l'élément comporte une zone poreuse (16) entourée d'un second gaz (2). Si l'on établit un gradient de pression entre le second gaz (2) et le premier gaz (1), moyennant quoi le premier gaz (1) est à une pression légèrement inférieure, le second gaz (2) traverse la zone poreuse (16) et empêche ainsi la poudre, dans le mélange entre le premier gaz et la fine poudre, de coller ou de s'agglomérer dans l'élément de distribution, ce qui donne une paroi active non collante par rapport à la fine poudre.

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