Paper making and fiber liberation – Apparatus – Digester
Patent
1996-01-29
1997-12-16
Czaja, Donald E.
Paper making and fiber liberation
Apparatus
Digester
162 17, 162 52, 141286, 239681, 239687, D21C 708
Patent
active
056980795
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/SE94/00737, filed Aug. 12, 1994.
FIELD OF THE INVENTION
The present invention relates to an arrangement for spreading paper pulp in a container for storing or treating the pulp, which arrangement comprises a spreader wheel, rotatably mounted in the container, with spreader blades, a driving member for driving said spreader wheel and an inlet for supplying the pulp to said spreader wheel.
An arrangement according to the for spreading material is already known from U.S. Pat. No. 3,053,069. This arrangement relates to a bleaching tower, and more specifically to an arrangement for feeding paper pulp to the tower, a supply line for pulp opening inside the tower at its bottom. The arrangement comprises a wheel mounted on a drive shaft for distributing the pulp all around the bottom of the tower. The arrangement thus injects the pulp from the mouth along an annular path in which no radial distribution of the pulp takes place and is not necessary either.
In U.S. Pat. No. 3,053,067, a further arrangement for feeding paper pulp to a bleaching tower is shown and described, which is also mounted in the bottom of the bleaching tower and comprises pipes opening into the bleaching tower, from which the pulp is fed during rotation.
SUMMARY OF THE INVENTION
The aim of the present invention is to produce an arrangement of the type indicated in the introduction, which will distribute the pulp essentially over the entire cross-sectional area of the container.
A further aim of the invention is that the arrangement will be simple and reliable in its function.
The aims are achieved by means of an arrangement which has been given the characteristics which emerge from following description.
Preferred embodiments of the arrangement according to the invention have moreover been given one or more of the characteristics emerging from the description.
The arrangement for spreading pulp is thus intended principally for storage towers, buffer tanks or reactors. The arrangement is intended to be mounted at the top in the center of the container. The arrangement is constructed in such a manner that it can distribute the pulp evenly over the entire cross-sectional area of the container which my be a tower, a tank or a reactor. By even spreading of the pulp over the cross-sectional area, an even feeding-out rate (plug flow) is achieved, as a result of which the risk of canalizing is eliminated.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail below with reference to the attached drawings, which show a preferred embodiment.
FIG. 1 shows a partial cross-section through the upper part of a container for treating paper pulp with a first embodiment of a distributing arrangement according to the invention mounted thereon.
FIG. 2 shows a detail of the view in FIG. 1 on an enlarged scale.
FIG. 3 shows a partial cross-section through the upper part of a container for treating paper pulp with a second embodiment of a distributing arrangement according to the invention mounted thereon.
FIG. 4 shows a top view of the arrangement according to the invention.
FIG. 5 shows a cross-section along line V--V in FIG. 4.
DETAILED DESCRIPTION OF THE INVENTION
In FIGS. 1 and 2, a first embodiment of a distributing arrangement according to the invention is shown, mounted in the upper part of a container 101 for storing or preparing paper pulp. The pulp is supplied to the container 101, which can consist of a storage tower, a buffer tank, a reactor or the like, through a line 102 which opens with an upwardly directed inlet 103 (overflow) at the top in the container. A spreader wheel 104 is rotatably mounted on a drive shaft 105 which in the exemplary embodiment shown is mounted in the upper part of the container 101 and is driven via a transmission 106 by a motor 107.
In FIG. 3, a second embodiment of a distributing arrangement according to the invention is shown, mounted in an upper part of a container 201 similar to that in FIGS. 1 and 2 for storing or prepari
REFERENCES:
patent: 3315823 (1967-04-01), Rikoff
Ekholm Rolf
Gronvold-Hansen Christen
Czaja Donald E.
Kvaerner Pulping Technologies AB
Leavitt Steven B.
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