Method for distributing cellulose pulp of low and medium consistency in order to form a uniform pulp web
The method is for distributing cellulose pulp that has a 2-12% consistency. A manifoid housing is in fluid communication with distributor housing. The distributor housing has holes that are distributed along a generatrix of the distribution housing. The cellulose pulp is fed into an inlet of the manifold housing. The feed screw is rotated to convey the cellulose pulp in the transverse direction through the distributor housing. The feed screw sweeps across the holes in the distributor housing to urge the cellulose pulp through the holes. The cellulose pulp is uniformly fed through the holes and then through an inlet to dewatering drums. The cellulose pulp is run between the dewatering drums and a trough to form a pulp web. The pulp web is dewatered in a press nip formed between the dewatering drums. The dewatered pulp web is collected by a feed screw.
1. A method of distributing cellulose pulp, comprising:
providing a cellulose pulp having a consistency range of 2 to 14%;
providing a manifold housing in fluid communication with a transversely directed elongate distributor housing, the distributor housing having an elongate rotatable helical feed screw disposed therein, the distributor housing having a first hole, a second hole and a third hole defined therein, the first, second and third holes being distributed along a generatrix of the distributor housing;
feeding the cellulose pulp into an inlet of the manifold housing;
rotating the feed screw to convey the cellulose pulp in the transverse direction through the distributor housing;
the feed screw sweeping across the first, second and third holes in the distributor housing to urge the cellulose pulp through the first, second and third holes;
uniformly feeding the cellulose pulp through the first, second one third holes;
feeding the cellulose pulp through an inlet to dewatering drums;
running the cellulose pulp between the dewatering drums and a trough to form a pulp web;
dewatering the pulp web in a press nip formed between the dewatering drums; and
collecting the dewatered pulp web by a pulp collecting screw.
2. The method according to claim 1 wherein the method further comprises placing the first, second and third holes at a lowest part of the distributor housing.
3. The method according to claim 1 wherein the method further comprises providing the feed screw with a screw core that has a screw thread, the screw core has a continuously increasing diameter for maintaining a substantially constant flow of the cellulose pulp through the holes and for compensating for pressure losses resulting from the cellulose pulp being fed through the first, second and third holes.
4. The method according to claim 3 wherein the method further comprises continuously decreasing a pitch of the screw thread.
5. The method according to claim 1 wherein the method further comprises providing the distributor housing with an inlet, arranging the inlet at a middle of the distributor housing.
6. The method according to claim 1 wherein the method further comprises providing the distributor housing with an end having a counter thread and the counter thread creating a counter pumping effect at the end of the distributor housing.
7. The method according to claim 1 wherein the method further comprises the holes preventing the cellulose pulp from falling free down towards the pulp web.
8. The method according to claim 1 wherein the method further comprises the holes forming a pressure crop, the pressure drop distributing the cellulose pulp across the entire distributor housing before feeding out the cellulose pulp from the distributor housing.
9. The method according to claim 1 wherein the method further comprises the feed screw sweeping a crest thereof across the holes to maintain a continuous exposure of the holes.