EP 3215672 B1 20190123 - METHOD FOR OPERATING A TWO VESSEL DIGESTER SYSTEM
Title (en)
METHOD FOR OPERATING A TWO VESSEL DIGESTER SYSTEM
Title (de)
VERFAHREN ZUM BETRIEB EINES FAULSYSTEMS MIT ZWEI BEHÄLTERN
Title (fr)
PROCÉDÉ DE FONCTIONNEMENT D'UN SYSTÈME DE DIGESTEUR À DEUX CUVES
Publication
Application
Priority
- SE 1451340 A 20141107
- SE 2015051161 W 20151104
Abstract (en)
[origin: WO2016072919A1] The invention relates to an improved two vessel cooking system, wherein the first vessel is an atmospheric impregnation vessel and the second vessel is a pressurized digester, where hot black liquor is finally flashed off inside the impregnation vessel for steaming the cellulosic material and providing the impregnation liquor. According to the inventive method is an additional cleaner wash liquor heated and added to final cook zone in digester, while displacing a corresponding amount of hot black liquor before the final cook zone, and the heat value in the hot black liquor is recovered first in transport circulation before being used as source for flashing off steam used to steam the comminuted cellulosic material inside the impregnation liquor and final use as impregnation liquor. The invention results in a cooking process with high yield and improved delignification in final cooking phases and reduced COD content in the produced pulp without increasing steam consumption.
IPC 8 full level
D21C 3/24 (2006.01); D21C 3/02 (2006.01); D21C 7/14 (2006.01); D21C 9/02 (2006.01); D21C 11/00 (2006.01)
CPC (source: EP SE)
D21C 3/02 (2013.01 - EP SE); D21C 3/24 (2013.01 - EP SE); D21C 7/14 (2013.01 - EP); D21C 9/02 (2013.01 - EP); D21C 11/00 (2013.01 - EP); D21C 7/14 (2013.01 - SE); D21C 9/02 (2013.01 - SE); D21C 11/0028 (2013.01 - SE)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2016072919 A1 20160512; BR 112017009620 A2 20171219; BR 112017009620 B1 20220412; CL 2017001066 A1 20171229; EP 3215672 A1 20170913; EP 3215672 A4 20180502; EP 3215672 B1 20190123; SE 1451340 A1 20160508; SE 538452 C2 20160705
DOCDB simple family (application)
SE 2015051161 W 20151104; BR 112017009620 A 20151104; CL 2017001066 A 20170428; EP 15857624 A 20151104; SE 1451340 A 20141107