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US 5,357,688 AGranted
Method and apparatus for treating a pulverulent or particulate material or product with gas
AssigneeNiro A/S
InventorMogens A. Christensen
Life of this patent
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AssigneeNiro A/S
InventorMogens A. Christensen
Estimating the term…
A fluid bed dryer comprises a bed plate (12) defining openings or perforations (22) therein, means (16) for feeding a pulverulent or particulate product (P) to the bed plate (13), means (12, 14) for directing fluidizing gas flows upwardly through said openings or perforations (22) so as to fluidize the product fed thereto, and means (17, 19) for discharging product (p) from the bed plate (13). The bed plate (13) comprises at least one bed plate section, each of which is divided into elongated zones (32, 34-36) extending substantially between first and second positions of the plate section. First and/or second pluralities (22b22a) of the openings or perforations (22) are substantially uniformly distributed over the area of each of at least some (34-36) of said zones and are directed and shaped so as to impart to the fluidizing gas flows a flow component which is directed generally towards said first and second positions, respectively. The number of the second plurality of openings (22a) in one zone (35) exceeds that of the other (34, 36), whereby the resulting transporting component of the fluidizing gas flows may be adjusted as desired by choosing proper proportions of the number of the first and second pluralities of openings in adjacent zones.
A method of treating a particulate material or product with gas, said method comprising
A bed plate for a fluid bed having a first, inlet position and a second, outlet position, and defining first and second pluralities of openings therein for allowing fluidizing gas to flow upwardly through the plate, which is divided laterally into a plurality of elongated zones each of said zones extending substantially between said first and second positions, and the openings of each of said first and second pluralities being substantially uniformly distributed over the area of at least one of said zones, the number of openings of said second plurality being different in adjacent zones, and each of the openings of said first plurality being directed and shaped so as to define means to provide a fluidizing gas flow having a flow component directed parallel with the plane of the bed plate and towards said first position thereon, while each of the openings of the second plurality is directed and shaped so as to define means to provide a fluidizing gas flow having a flow component directed parallel with the plane of the bed plate and towards said second position thereon.
A fluid bed dryer comprising:
Dependencies are inferred from the claim text.