Method and an apparatus for processing finely divided fibrous pulp with gas without overpressure
AssigneeMyrens Verksted A/S
InventorsBjorn H. Fritzvold, Helge Carling, Leif H. Eriksen
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Abstract
A method and apparatus for treating finely divided fibrous pulp with gas without overpressure in a continuous process. The bulk material is substantially continuously supplied to a reactor having one or more supporting floors having apertures of a shape and size which allow the finely divided material to form bridges across the apertures, said apertures also permitting a continuous flow of gas through the bulk material. The bulk material proceeds through the reactor as a consequence of the bridges being broken by breaking arms sweeping along the upper surface of the supporting floors.
Claims25
A method of treating finely divided fibrous pulp with a gas without overpressure, comprising the steps of substantially continuously supplying pulp to a reactor having a plurality of stages, said pulp being distributed in layers which substantially cover the entire cross-section of the reactor, each stage being divided by a surface having sufficiently small radially extending apertures evenly distributed across the entire cross-section of the reactor for the pulp to form bridges temporarily supporting each layer in turn, the pulp being conveyed from stage to stage by gravity;
- continuously flowing the gas through all of the apertures and through the temporarily supported pulp over the entire cross-section of the reactor;
- and breaking the pulp bridges at periodic time intervals thereby advancing the pulp downwards through the apertures from one stage to another for merging with a subjacent layer or to be removed from the reactor as a processed pulp.
Apparatus for treating finely divided fibrous pulp, with gas without overpressure, comprising a reactor having an inlet for distributing a suitable layer of pulp, inlet means for fresh gas and outlet means for used gas, a rotatable central shaft having an axis, one or more subjacent substantially stationary supporting means, each extending across substantially the total cross-section of the reactor and each serving temporarily to collect the distributed pulp in a layer, each supporting means being provided with generally radially extending apertures evenly distributed across the total surface of the supporting means and having a shape and size allowing the finely divided pulp to form bridges across the apertures, said apertures allowing the gas to flow continuously through the pulp, and movable breaking means associated with each supporting means and advanced by driving means along the upper side of the supporting means in the area of the pulp bridges to break these bridges so that the pulp under the influence of gravity is advanced downwards in the reactor to merge with a subjacent layer or to be removed from the reactor as finished processed pulp.
Dependencies are inferred from the claim text.