EP3215672A1 - Method for operating a two vessel digester system - Google Patents
Method for operating a two vessel digester systemInfo
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000010411 cooking Methods 0.000 claims abstract description 130
- 238000005470 impregnation Methods 0.000 claims abstract description 81
- 239000000463 material Substances 0.000 claims abstract description 58
- 238000010025 steaming Methods 0.000 claims abstract description 26
- 230000004087 circulation Effects 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 11
- 239000000706 filtrate Substances 0.000 claims description 42
- 239000003513 alkali Substances 0.000 claims description 41
- 239000002023 wood Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 230000014759 maintenance of location Effects 0.000 claims description 13
- 238000012546 transfer Methods 0.000 claims description 12
- 229920005610 lignin Polymers 0.000 claims description 8
- 238000009835 boiling Methods 0.000 claims description 5
- 230000003134 recirculating effect Effects 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229920002488 Hemicellulose Polymers 0.000 description 10
- 238000011161 development Methods 0.000 description 8
- 238000005406 washing Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 102100030386 Granzyme A Human genes 0.000 description 2
- 101001009599 Homo sapiens Granzyme A Proteins 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- YSGSDAIMSCVPHG-UHFFFAOYSA-N valyl-methionine Chemical compound CSCCC(C(O)=O)NC(=O)C(N)C(C)C YSGSDAIMSCVPHG-UHFFFAOYSA-N 0.000 description 2
- 101100016516 Caenorhabditis elegans hbl-1 gene Proteins 0.000 description 1
- 102100033934 DNA repair protein RAD51 homolog 2 Human genes 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 244000166124 Eucalyptus globulus Species 0.000 description 1
- 101001132307 Homo sapiens DNA repair protein RAD51 homolog 2 Proteins 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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.
Abstract
Description
Claims
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 (en) | 2017-09-13 |
EP3215672A4 EP3215672A4 (en) | 2018-05-02 |
EP3215672B1 EP3215672B1 (en) | 2019-01-23 |
Family
ID=55909499
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15857624.9A Active EP3215672B1 (en) | 2014-11-07 | 2015-11-04 | Method for operating a two vessel digester system |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3215672B1 (en) |
BR (1) | BR112017009620B1 (en) |
CL (1) | CL2017001066A1 (en) |
SE (1) | SE538452C2 (en) |
WO (1) | WO2016072919A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR112018070795A2 (en) * | 2016-05-27 | 2019-02-05 | Valmet Oy | method for the impregnation of chips during the manufacture of chemical pulp, and atmospheric impregnation vessel |
Family Cites Families (6)
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 |
FI990127A0 (en) * | 1999-01-22 | 1999-01-22 | Ahlstrom Machinery Oy | Process for treating pulp |
SE0200185L (en) * | 2002-01-24 | 2002-12-10 | Kvaerner Pulping Tech | Process for increasing the heating economy of the boiler system during continuous boiling |
FI123023B (en) * | 2009-09-01 | 2012-10-15 | Andritz Oy | Method and apparatus for separating soap |
-
2014
- 2014-11-07 SE SE1451340A patent/SE538452C2/en unknown
-
2015
- 2015-11-04 EP EP15857624.9A patent/EP3215672B1/en active Active
- 2015-11-04 BR BR112017009620-0A patent/BR112017009620B1/en active IP Right Grant
- 2015-11-04 WO PCT/SE2015/051161 patent/WO2016072919A1/en active Application Filing
-
2017
- 2017-04-28 CL CL2017001066A patent/CL2017001066A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP3215672A4 (en) | 2018-05-02 |
SE538452C2 (en) | 2016-07-05 |
CL2017001066A1 (en) | 2017-12-29 |
BR112017009620A2 (en) | 2017-12-19 |
EP3215672B1 (en) | 2019-01-23 |
WO2016072919A1 (en) | 2016-05-12 |
SE1451340A1 (en) | 2016-05-08 |
BR112017009620B1 (en) | 2022-04-12 |
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US20050103454A1 (en) | Pretreatment of chips with white liquor prior to a treatment with black liquor | |
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