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US 5,345,896 AGranted
Method and apparatus for circulating solid material in a fluidized bed reactor
AssigneeA. Ahlstrom Corporation
InventorTimo Hyppanen
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AssigneeA. Ahlstrom Corporation
InventorTimo Hyppanen
Estimating the term…
A reactor chamber of a fluidized bed reactor has an internal circulation of particles. Larger recirculated particles are prevented from contacting heat transfer surfaces by classifying particles adjacent the bottoms of the reactor chamber using a particle chamber having a barrier wall with holes or slots of a maximum dimension of less than about 30 mm. The heat transfer surfaces may be disposed in the particle chamber. Larger particles flow down the walls of the particle chamber into the reactor chamber, and some fine particles within the particle chamber are preferably recirculated back to the fluidized bed. The barrier wall is preferably the top wall of the particle chamber, and may be refractory lined with furrows, and/or may be formed of water tubes connected together by fins, with the holes or slots formed in the fins.
A method for circulating solid material in a fluidized bed reactor, including a reactor chamber having side walls defining the interior of the reactor chamber and a grid at the bottom of the reactor chamber, a gas discharge opening adjacent the upper end of the reactor chamber, and a fluidized bed of solid particles in said reactor chamber, the fluidized bed having an internal circulation of solid particles, said method comprising the steps of:
Apparatus for circulating solid material in a fluidized bed reactor, comprising:
Dependencies are inferred from the claim text.