EP3215672A1 - Verfahren zum betrieb eines faulsystems mit zwei behältern - Google Patents

Verfahren zum betrieb eines faulsystems mit zwei behältern

Info

Publication number
EP3215672A1
EP3215672A1 EP15857624.9A EP15857624A EP3215672A1 EP 3215672 A1 EP3215672 A1 EP 3215672A1 EP 15857624 A EP15857624 A EP 15857624A EP 3215672 A1 EP3215672 A1 EP 3215672A1
Authority
EP
European Patent Office
Prior art keywords
liquor
digester
cooking
vessel
impregnation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15857624.9A
Other languages
English (en)
French (fr)
Other versions
EP3215672A4 (de
EP3215672B1 (de
Inventor
Fredrik Wilgotson
Magnus Hägglund
Krister Olsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Valmet AB
Original Assignee
Valmet Oy
Valmet AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Oy, Valmet AB filed Critical Valmet Oy
Publication of EP3215672A1 publication Critical patent/EP3215672A1/de
Publication of EP3215672A4 publication Critical patent/EP3215672A4/de
Application granted granted Critical
Publication of EP3215672B1 publication Critical patent/EP3215672B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/24—Continuous processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
    • D21C11/0028—Effluents derived from the washing or bleaching plants
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C7/00—Digesters
    • D21C7/14—Means for circulating the lye
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents

Definitions

  • the present invention concerns a method for the continuous cooking of cellulose according to the introduction to claim 1 with the aim of achieving improved washing and delignification at less losses in heat economy.
  • FIG. 1 shows the development of continuous cooking processes with start from 1957;
  • FIG. 1 shows schematically the flow routing in Compact Cooking G2
  • Figure 3 show the upper part of the atmospheric impregnation vessel used in Compact Cooking G2;
  • Figure 6 shows a preferred brown wash in form of a pressure diffuser washing the pulp coming directly from the blow line of the digester.
  • Compact Cooking is more of an opposite to Lo-Solids cooking as the content of dissolved hemicellulose is kept high during the cook in order to increase yield as the hemicellulose starts to precipitate back on the pulp at final phases of cook.
  • the atmospheric impregnation vessel with substantial retention time, and a dedicated cooking vessel is the optimal design of the digester system.
  • the atmospheric impregnation vessel enable a thorough impregnation of comminuted cellulosic material with alkali all the way to the core of the comminuted cellulosic material, reducing the amount of rejects after cook to a minimum.
  • the comminuted cellulosic material are also steamed in the very same vessel by adding hot black liquor to the liquor level established in the ImpBin, allowing steam to flash off and into an established chip volume above liquor level.
  • the patent US71 12256 is related to the CrossCirc features that the bulk volume of return liquor from the top separator is instead sent to this liquor level in ImpBin, and before that is instead hot black liquor added to start of transfer (instead of the top separator return liquor that was conventional practice). This improves heat economy as heating takes place towards cooking temperature in transfer to digester, and the residual heat in the top separator return liquor is allowed to flash off for steaming, while yet establishing a low impregnation temperature in black liquor after flashing.
  • the concepts with Compact Cooking G2, using an ImpBin is disclosed also in
  • the top separator In the top separator is excess transport liquor withdrawn at a L/W ratio of about 6-8, and this transport liquor is sent to top of ImpBin to be released into the chip pile volume established above the liquor level, where steam is released.
  • the impregnation liquor for the ImpBin is established by the hot black liquor withdrawal which after mixing into the transport circulation for heating, is withdrawn in top separator and sent to top of ImpBin.
  • the black liquor is thus given an increased retention time in the cooking system as it is recirculated back to ImpBin and maintained in first cooking zone.
  • the increased retention time is beneficial for increasing yield, as the hemicellulose dissolved early in cooking need time and high alkali concentration for cleaving off end groups to such an extent that it precipitates back on the cellulose.
  • a cooking circulation CC be installed, that promotes an enhanced radial distribution of the new cooking liquor.
  • a cooking circulation normally includes also a pump (not shown).
  • the amount of fresh alkaline liquor charged to the wash filtrate is charged to a cooking circulation recirculating a part of the liquor withdrawn from the digester withdrawal screen to the center of the digester vessel at the height position of the digester withdrawal screen (as shown in figure 5), or alternatively is charged to a cooking circulation recirculating a part of the liquor withdrawn from a wash withdrawal screen (the lowermost screen shown in figure 5) to the center of the digester vessel at the height position of the digester withdrawal screen.
  • This modification of the cooking liquor improves delignification, such the typical low order of delignification that could be obtained in final delignification, reaching a kappa reduction in the order of 15-20 units, may be increased by at least 5-10 units.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
EP15857624.9A 2014-11-07 2015-11-04 Verfahren zum betrieb eines faulsystems mit zwei behältern Active EP3215672B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1451340A SE538452C2 (en) 2014-11-07 2014-11-07 Method for operating a two vessel digester system
PCT/SE2015/051161 WO2016072919A1 (en) 2014-11-07 2015-11-04 Method for operating a two vessel digester system

Publications (3)

Publication Number Publication Date
EP3215672A1 true EP3215672A1 (de) 2017-09-13
EP3215672A4 EP3215672A4 (de) 2018-05-02
EP3215672B1 EP3215672B1 (de) 2019-01-23

Family

ID=55909499

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15857624.9A Active EP3215672B1 (de) 2014-11-07 2015-11-04 Verfahren zum betrieb eines faulsystems mit zwei behältern

Country Status (5)

Country Link
EP (1) EP3215672B1 (de)
BR (1) BR112017009620B1 (de)
CL (1) CL2017001066A1 (de)
SE (1) SE538452C2 (de)
WO (1) WO2016072919A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109312537A (zh) * 2016-05-27 2019-02-05 维美德公司 用于料片浸渍的双重碱加料

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5536366A (en) * 1993-05-04 1996-07-16 Ahlstrom Machinery Inc. Digester system for implementing low dissolved solids profiling
US5522958A (en) * 1994-07-18 1996-06-04 Pulp And Paper Research Institute Of Canada Two-stage kraft cooking
US6468390B1 (en) * 1998-08-24 2002-10-22 Kvaerner Pulping Ab Method for continuous cooking of lignocellulosic fiber material
FI990127A7 (fi) * 1999-01-22 2000-07-23 Andritz Oy Menetelmä massan käsittelemiseksi
SE518957C2 (sv) * 2002-01-24 2002-12-10 Kvaerner Pulping Tech Förfarande för att öka värmeekonomin i kokarsystemet vid kontinuerlig kokning
FI123023B (fi) * 2009-09-01 2012-10-15 Andritz Oy Menetelmä ja laitteisto suovan erottamiseksi

Also Published As

Publication number Publication date
WO2016072919A1 (en) 2016-05-12
BR112017009620B1 (pt) 2022-04-12
CL2017001066A1 (es) 2017-12-29
SE538452C2 (en) 2016-07-05
EP3215672A4 (de) 2018-05-02
BR112017009620A2 (pt) 2017-12-19
EP3215672B1 (de) 2019-01-23
SE1451340A1 (sv) 2016-05-08

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