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US 6,811,655 B1Granted
Apparatus for preparing paper pulp from used paper
AssigneeFinidro-Financiamentos Energeticos, Lda.
InventorEric Haffner
Life of this patent
Estimating the term…
Abstract
The invention concerns a method and an equipment for combining in one single apparatus, the functions for filtering, decontaminating, and thickening paper pulp from used paper, while providing the complementary function of clarifying the filtrates. The apparatus (1) rotates at high speed. The paper pulp is introduced through the center of the apparatus (2) and driven at its angular speed. The pulp is then brought along a grate (6) with small size holes for separating the fibers from the greater part of the water. The thickened pulp is evacuated through extraction nozzles (8). The water is clarified in the clarification zone (12) and recycled or eliminated depending on uses. More complete embodiments of the apparatus include the functions of fractionating, de-inking and purifying the pulp with slots or holes.
Claims19
An apparatus for the preparation of paper pulp from used papers previously disintegrated and put in fibrous suspension by a pulper, said apparatus comprising a body (1) rotating at high speed driving together all components inside it, the body (1) comprising:
- an inlet pipe (2) for the fibrous suspension located at the centre of the body (1), being the fibrous suspension driven at the angular speed of the body by means of blades (3) solidary with the body (1);
- a feeding zone (4) of a filtration grate (6) into which the fibrous suspension introduced in the body (1) of the apparatus is driven, being the grate (6) provided with small holes which allow to retain at least a part of the fibres contained in the suspension while the major part of the water, small contaminants and mineral loads contained in the suspension pass through the grate (6);
- a zone (7) for the concentration of the part of the suspension retained by the grate (6) located at the periphery of the feeding zone (4) of the grate (6);
- several apertures (8) located at the periphery of the body (1) of the apparatus to evacuate the concentrated suspension from the concentration zone (7);
- and
- a clarification chamber (16) to clarify the water having passed through the grate (6), the clarification chamber (16) comprising separation cones to facilitate the separation and migration of solid elements present in the water to be clarified, said clarification chamber also including apertures (20) located at the periphery of the apparatus body (1) for the evacuation of the solid elements having sedimented at the periphery of said chamber (16) and a central pipe (21) for the evacuation of the clarified water;
- and
- a preclarification chamber (33), immediately upstream the clarification chamber (16), aimed to separate the coarser solid elements before the final clarification of the water.
5 more elements
An apparatus for the preparation of paper pulp from used papers previously disintegrated and put in fibrous suspension by a pulper, said apparatus comprising a body (1) rotating at high speed driving together all components inside it, the body (1) comprising:
- an inlet pipe (2) for the fibrous suspension located at the centre of the body (1), being the fibrous suspension driven at the angular speed of the body by means of blades (3) solidary with the body (1);
- a feeding zone (4) of a filtration grate (6) into which the fibrous suspension introduced in the body (1) of the apparatus is driven, being the grate (6) provided with small holes which allow to retain at least a part of the fibres contained in the suspension while the major part of the water, small contaminants and mineral loads contained in the suspension pass through the grate (6);
- a zone (7) for the concentration of the part of the suspension retained by the grate (6) located at the periphery of the feeding zone (4) of the grate (6);
- several apertures (8) located at the periphery of the body (1) of the apparatus to evacuate the concentrated suspension from the concentration zone (7);
- and
- a clarification chamber (16) to clarify the water having passed through the grate (6), the clarification chamber (16) including apertures (20) located at the periphery of the apparatus body (1) for the evacuation of the solid elements having sedimented at the periphery of said chamber (16) and a central pipe (21) for the evacuation of the clarified water;
- and
- a sedimentation device upstream the filtration grate (6), in order to make a separation of some contaminants with big dimensions contained in the fibrous suspension introduced in the apparatus, said device being constituted by:
- a sedimentation chamber (25);
- a hole (22b) located in the part closer to the axis of the sedimentation chamber (25), aimed to separate the light elements which there concentrate and driving them to the central pipe (22) and allowing their elimination;
- a hole (26) located at the periphery of the sedimentation chamber (25), aimed to separate the heavy elements, including cellulose fibres, which there sediment;
- a pipe (27) deriving the part of the fibrous suspension having passed into the chamber (25) and having not been separated by the holes (22b) and (26) of separation of light and heavy elements, into the feeding zone (4) of the filtration grate (6), or to the following stage of the method, if a complementary device is located between the sedimentation device and the filtration grate feeding zone;
- said pipe (27) having an inclination and section adapted so that the cellulosic elements are driven by the flow without sedimenting there;
- a pipe connecting the hole (26) for the separation of heavy elements to the pipe mentioned in the previous paragraph;
- a hole (30) for the elimination of heavy elements, in the peripheral part of the pipe (27) mentioned at paragraph d), aimed to collect and separate the heavier contaminants which sediment at the periphery of said pipe (27);
- and a pipe leading the solid elements captured by hole (30) for the elimination of the heavy elements mentioned at paragraph f) to the apertures (38), located at the periphery of the body (1), for the evacuation of the elements collected by said hole (30).
13 more elements
An apparatus for the preparation of paper pulp from used papers previously disintegrated and put in fibrous suspension by a pulper, said apparatus comprising a body (1) rotating at high speed driving together all components inside it, the body (1) comprising:
- an inlet pipe (2) for the fibrous suspension located at the centre of the body (1), being the fibrous suspension driven at the angular speed of the body by means of blades (3) solidary with the body (1);
- a feeding zone (4) of a filtration grate (6) into which the fibrous suspension introduced in the body (1) of the apparatus is driven, being the grate (6) provided with small holes which allow to retain at least a part of the fibres contained in the suspension while the major part of the water, small contaminants and mineral loads contained in the suspension pass through the grate (6);
- a zone (7) for the concentration of the part of the suspension retained by the grate (6) located at the periphery of the feeding zone (4) of the grate (6);
- several apertures (8) located at the periphery of the body (1) of the apparatus to evacuate the concentrated suspension from the concentration zone (7);
- and
- a clarification chamber (16) to clarify the water having passed through the grate (6), the clarification chamber (16) including apertures (20) located at the periphery of the apparatus body (1) for the evacuation of the solid elements having sedimented at the periphery of said chamber (16) and a central pipe (21) for the evacuation of the clarified water;
- and
- a classifier device upstream the filtration grate (6), aimed to separate the contaminants having a dimension higher than the cellulose fibres, said apparatus being constituted by:
- a classifier grate (23) having a flat or conical shape and having calibrated slots or holes such that the majority of the cellulose fibres pass through the slots and/or holes;
- apertures (38) located at the periphery of the apparatus body (1) and upstream the classifier grate (23), allowing to evacuate the elements, which do not pass through the slots and/or holes and migrate to the periphery of said grate (23);
- a central pipe (22) aimed to collect and evacuate from the apparatus body (1) the elements, which do not pass through the slots and/or holes, and migrate to the axis of the apparatus;
- and a pipe (24) leading the water and the elements having passed the classifier grate (23) to the feeding zone (4) of the filtration grate (6).
9 more elements
Dependencies are inferred from the claim text.