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1. WO2020005131 - METHOD AND ARRANGEMENT FOR RE-COOKING KNOTS IN BATCH COOKING OF PULP

Publication Number WO/2020/005131
Publication Date 02.01.2020
International Application No. PCT/SE2019/050473
International Filing Date 23.05.2019
IPC
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
3
Pulping cellulose-containing materials
22
Other features of pulping processes
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
7
Digesters
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
7
Digesters
06
Feeding devices
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
9
After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
D
TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
5
Purification of the pulp suspension by mechanical means; Apparatus therefor
02
Straining or screening the pulp
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
D
TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
99
Subject matter not provided for in other groups of this subclass
D21C 3/22 (2006.01)
D21C 7/00 (2006.01)
D21C 7/06 (2006.01)
D21C 9/00 (2006.01)
D21D 5/02 (2006.01)
D21D 99/00 (2006.01)
CPC
D21C 3/22
D21C 7/00
D21C 7/06
D21C 9/00
D21D 5/02
D21D 99/00
Applicants
  • VALMET AB [SE/SE]; . 851 94 Sundsvall, SE
Inventors
  • KUUSISTO, Petteri; FI
Agents
  • JOHANSSON, Roger; SE
Priority Data
1850800-227.06.2018SE
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND ARRANGEMENT FOR RE-COOKING KNOTS IN BATCH COOKING OF PULP
(FR) PROCÉDÉ ET AGENCEMENT DE RE-CUISSON DE NŒUDS DANS LA CUISSON PAR LOTS DE PÂTE À PAPIER
Abstract
(EN)
The present invention relates to a knot re-cooking arrangement for batch cooking of pulp, comprising: a batch digester (4) for cooking wood chips in a Kraft process to produce pulp, a knot removal device for removing knots (10) from pulp that has been discharged from the batch digester (4), and a return system for returning knots (10) in a carrying medium (12') to the batch digester (4), wherein the return system is arranged to supply the knots (10) in the carrying medium (12') to an upper portion (42) of the batch digester (4) and wherein the return system is arranged to supply the knots (10) in the carrying media (12') to the batch digester (4) after a prehydrolysis step (107) but before a cooking step (104). The invention also relates to a method for re-cooking knots in batch cooking of pulp.
(FR)
La présente invention concerne un agencement de re-cuisson de nœuds pour la cuisson par lots de pâte à papier, comprenant : un digesteur en discontinu (4) pour cuire des copeaux de bois dans un procédé Kraft pour produire de la pâte à papier, un dispositif de retrait de nœuds pour retirer des nœuds (10) de la pâte à papier qui a été déchargée du digesteur en discontinu (4), et un système de retour pour renvoyer des nœuds (10) dans un support de transport (12') vers le digesteur en discontinu (4), le système de retour étant conçu pour amener les nœuds (10) dans le support de transport (12') à une partie supérieure (42) du digesteur en discontinu (4), et le système de retour étant conçu pour amener les nœuds (10) dans le support de transport (12') au digesteur en discontinu (4) après une étape de pré-hydrolyse (107) mais avant une étape de cuisson (104). L'invention concerne également un procédé de re-cuisson de nœuds dans la cuisson par lots de pâte à papier.
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