EP3212840A1 - Method and arrangement for discharge dilution - Google Patents
Method and arrangement for discharge dilutionInfo
- Publication number
- EP3212840A1 EP3212840A1 EP15856135.7A EP15856135A EP3212840A1 EP 3212840 A1 EP3212840 A1 EP 3212840A1 EP 15856135 A EP15856135 A EP 15856135A EP 3212840 A1 EP3212840 A1 EP 3212840A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulp
- discharge
- digester
- liquor
- screening process
- 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
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
- D21C3/22—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
- D21C3/00—Pulping cellulose-containing materials
-
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
Definitions
- the present invention relates to pulp manufacturing processes in general, and particularly to adaptations of discharge dilution to enable improvements in screening in such processes.
- Pulp processing typically comprises introducing wood chips or other lignocellulosic material into a digester or cooker together with an impregnation liquid e.g. black liquor from a displacement tank and the chips or other lignocellulosic material is preheated and pre-impregnated.
- Black liquor is the waste product from the so called Kraft process when pulpwood is digested into paper pulp removing lignin, hemicelluloses and other extractives from the wood to free the cellulose fibers.
- black liquor is an aqueous solution of lignin residues, hemicellulose, and the inorganic chemicals used in the process.
- white liquor is a strongly alkaline solution typically of sodium hydroxide and sodium sulfide which is used to break the bonds between lignin and cellulose.
- white liquor is the "pure" impregnation liquid whereas the black liquor is recycled impregnation liquid.
- hot black and white liquor is introduced into the digester and displaces the initially introduced impregnation liquid back into the displacement tank. Due to the introduction of hot liquor the fiber is heated and cooked during a period of maintaining the temperature at a desired level. The cooking dissolves or softens the lignin in the material and the cooking time and temperature is dependent on the material to be cooked as well as desired fiber properties after cooking.
- black liquor e.g.
- Lignocellulose or lignocellulosic material refers to plant dry matter (biomass), so called lignocellulosic biomass.
- So called virgin biomass includes all naturally occurring terrestrial plants such as trees, bushes and grass.
- So called waste biomass is produced as a low value byproduct of various industrial sectors such as agricultural (corn stover, sugarcane bagasse, straw etc.), forestry (saw mill and paper mill discards).
- Energy crops are crops with high yield of lignocellulosic biomass produced to serve as a raw material for production of second generation biofuel examples include switch grass (Panicum virgatum) and Elephant grass.
- Pulp consistency is defined as the mass concentration of fibers in water. Consistency is calculated as (dry weight of sample/ wet weight of sample) l00%. Pulp consistency is roughly divided into three ranges:
- the different ranges of consistency are found in different parts of the pulping and papermaking process, for example high consistency can be found in e.g. mechanical pulping, reject refining, bleaching, storage, medium consistency in e.g. cooking, bleaching, storage, re-pulping, low consistency in stock preparation, cleaning, screening, beating, and blending.
- liquor from the displacement liquor tank is utilized in order to dilute the pulp in the discharge sequence.
- the dilution is necessary in order to enable emptying or discharging the pulp from the digester and into the discharge tank.
- a reject washer is often such a process step/ stage.
- the accept from these process steps which is a low consistency pulp which resembles pure liquor more than a thicker pulp, is subsequently fed to a reject tank and then fed to the discharge tank.
- the flow from the reject tank then lowers the consistency in the system significantly.
- typically a so called delta thickener is added, which removes most of the liquor from the pulp fed to the discharge tank
- the pulp fed to the discharge tank from batch cooking does not have high consistency enough to handle all the liquor from the reject tank as dilution in the discharge tank without lowering the screen feed consistency more than desired.
- the consistency is increased with a thickening device e.g. delta thickener or the like in order to enable the screening being fed at a normal consistency.
- the thickening agent or device varies. The thickening agent and/ or machinery introduces both unwanted process steps and material into the process, thus increasing both time and costs for the pulping process. Therefore, there is a need for an improved dilution method and arrangement in the discharge sequence without the above mentioned disadvantages.
- the present invention relates to improved discharge method and arrangement in pulp processing.
- the proposed technology discloses a method of providing a diluted discharge pulp, comprising the steps of providing pulp with a first consistency in a digester, which pulp comprises cooked lignocellulosic fibrous material, diluting the provided pulp by feeding a reject liquor from a screening process into the digester to provide a diluted pulp in the digester, where the reject liquor from the screening process is a pulp with a lower consistency than the pulp with a first consistency, and feeding the diluted pulp through a discharge pipe to a discharge tank to provide a diluted discharge pulp.
- the pulp can be diluted without addition of any unwanted additives and reject liquor can be reused in the discharge process.
- Fig. 1 is a flow chart of an embodiment of a method according to the proposed technology
- Fig. 2 is a schematic block chart of a system according to the proposed technology.
- Fig. 3 is a schematic block chart illustrating prior art
- Fig. 4 is a schematic block chart illustrating the benefits of the embodiments of the proposed technology
- the present disclosure will be described in the context of a batch cooking process. However, it is easily adapted for a case of continuous cooking. Further, although the background and the description of the proposed technology primarily describes the so called Kraft process, it is equally applicable to sulfite processes or similar with appropriate adaptation of processing terminology.
- the inventors have identified the benefits of reusing reject liquor or low consistency pulp, i.e. pulp with a low concentration of solid fibers, from the screening process for diluting the pulp during the discharge sequence.
- reject liquor or low consistency pulp i.e. pulp with a low concentration of solid fibers
- the same functionality can be met by using liquor from a screening reject tank.
- the dilution is then reduced so that it is not necessary to add any thickening device to run screening in normal consistency.
- reusing low consistency reject liquor from the screening process for dilution during the discharge sequence will reduce the need for additives or machinery that increase the consistency of the feed into the screening process.
- the pulp can comprise processed wood fiber [1] or other processed lignocellulosic fiber.
- the method includes the steps of providing S 10 pulp with a first consistency in a digester, said pulp comprising digested or cooked wood chips or other lignocellulosic fibrous material at a certain concentration. Subsequently, diluting S20 the provided pulp by feeding a low consistency screening reject liquor, i.e.
- the low consistency screening reject liquor is in fact a pulp with low consistency, i.e. lower consistency than the pulp with a first consistency.
- the low consistency screening reject liquor has a lower concentration of fibers than the pulp with a first consistency.
- the diluting step S20 comprises feeding a first fraction of the reject liquor from the screening process into the discharge pipe to further dilute the pulp.
- the method includes the further steps of diluting S40 the discharge pulp in the discharge tank with a second fraction of the reject liquor from the screening process, before (which is common for all embodiments) feeding S50 the (diluted or undiluted) discharge pulp to the screening process for screening S60.
- the method includes an intermediate step of feeding the reject liquor from the screening process to a buffer, and subsequently feeding the first and/ or second fraction from the buffer to the digester and optionally also to the discharge pipe and/ or to the discharge tank.
- step S25 it is possible to control, in step S25, the dilution in order to achieve a diluted pulp with a predetermined consistency or concentration of fibers. This may be performed by determining the concentration of the pulp in the digester and diluting the pulp in order to achieve a wanted concentration. More commonly though is diluting the pulp just enough to enable discharging the pulp from the digester.
- a discharge dilution arrangement 100 according to the present disclosure will be described.
- the discharge dilution arrangement 100 comprises a digester 1 configured for receiving at least a lignocellulosic fibrous material and a cooking liquor to cook into a pulp. Further, the discharge dilution arrangement 100 includes a discharge tank 2 configured for receiving said pulp from said digester 1 and for outputting said pulp to a screening process. The digester 1 and the discharge tank 2 are connectable via a discharge pipe 3, configured for feeding cooked pulp from the digester 1 to the discharge tank 2.
- the discharge dilution arrangement 100 includes a digester dilution pipe 4 configured for feeding a reject liquor from the screening process into at least the digester tank 1 to dilute the pulp, where the reject liquor from the screening process is a pulp with a lower consistency than the pulp in the digester.
- the screening reject liquor is fed into the digester 1 at the bottom of the tank.
- the discharge dilution arrangement 100 includes a first discharge dilution pipe 4' configured for additionally feeding the reject liquor from the screening process into the discharge pipe 3 to further dilute the pulp in the discharge pipe 3.
- the discharge dilution arrangement 100 further comprises a buffer tank 6 arranged to receive the reject liquor from the screening process and to provide a first fraction of the reject liquor from the screening process to the digester dilution pipe 4 and optionally also a second fraction of the reject liquor from the screening process via the second discharge dilution pipe 5 to the discharge tank 2, to provide a diluted discharge pulp.
- the buffer tank 6 is further configured to provide a third fraction of the reject liquor from the screening process via the first discharge dilution pipe 4' to the discharge pipe 3.
- a digester 1 is disclosed with a capacity for processing 20 t/h of wood chips or other lignocellulosic material. Impregnation and/or cooking liquid, e.g. black and/ or white liquor or similar depending on the chemical process used, is added to achieve a concentration of fibers in the pulp, or first consistency of the pulp, of approximately 10%, corresponding to a total volume of 200 m 3 /h of cooked pulp. In order to enable emptying or discharging the digester 1 , more liquor or similar is added to dilute the cooked pulp and to reduce the consistency of the cooked pulp to e.g. 5%.
- Impregnation and/or cooking liquid e.g. black and/ or white liquor or similar depending on the chemical process used, is added to achieve a concentration of fibers in the pulp, or first consistency of the pulp, of approximately 10%, corresponding to a total volume of 200 m 3 /h of cooked pulp.
- more liquor or similar is added to dilute the cooked pulp and to reduce the consistency of the cooked pulp to
- the low consistency screening reject liquor is fed with a capacity of 2 t/h and a concentration of fibers, or consistency, of 0.6%, which corresponds to 330 m 3 /h.
- the discharge tank 2 outputs 22 t/h with a consistency of 3% and a volume of 730 m 3 /h.
- a screened pulp with a consistency of maximum 3% is provided to press feed and about 10% of the production is provided to a screening reject wash.
- the dilution in both the digester 1 and optionally the discharge tank 2 is provided by adding the low consistency screening reject liquor, in contrast to the prior art.
- a digester 1 is disclosed with a capacity for processing 20 t/h of wood chips or other lignocellulosic material.
- Impregnation and/or cooking liquid e.g. black and / or white liquor or similar depending on the chemical process used, is added to achieve a concentration or first consistency of approximately 10%, corresponding to a total volume of 200 m 3 /h of cooked pulp.
- a low consistency screening reject liquor with a consistency of approximately 0.6% is added to dilute the cooked pulp in the digester.
- the discharge 2 is also fed with the low consistency screening reject liquor.
- the above described fiber concentrations are merely examples.
- the above mentioned first consistency is typically around 10%, but can also vary within consistency intervals of for example around 9.5- 10.5%, 9- 1 1%, 8- 12%.
- the low consistency screening reject liquor is potentially 0.6%, but can also vary within concentration intervals of for example 0.3- 1%.
- the resulting diluted pulp is diluted to such an extent that it is possible to empty the digester with a minimum of dilution. As an example the diluted pulp could be between 4-7%, or 4-6%, 4-5%, 4.5-5.5%.
- the specific concentrations can vary also outside the above given example intervals.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1451303A SE539501C2 (en) | 2014-10-31 | 2014-10-31 | Method and arrangement for discharge dilution |
PCT/SE2015/051141 WO2016068783A1 (en) | 2014-10-31 | 2015-10-28 | Method and arrangement for discharge dilution |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3212840A1 true EP3212840A1 (en) | 2017-09-06 |
EP3212840A4 EP3212840A4 (en) | 2018-04-11 |
EP3212840B1 EP3212840B1 (en) | 2020-02-05 |
Family
ID=55857932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15856135.7A Active EP3212840B1 (en) | 2014-10-31 | 2015-10-28 | Method and arrangement for discharge dilution |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3212840B1 (en) |
CA (1) | CA2966142A1 (en) |
SE (1) | SE539501C2 (en) |
WO (1) | WO2016068783A1 (en) |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3303088A (en) * | 1963-04-19 | 1967-02-07 | Lummus Co | Continuous liquid-phase rapid pulping |
US3259538A (en) * | 1963-04-22 | 1966-07-05 | Lummus Co | Comprehensive pulping system for producing paper pulp |
US3830688A (en) * | 1970-10-23 | 1974-08-20 | Skogsaegarnas Ind Ab | Method of reducing the discharge of waste products from pulp mills |
SE394466C (en) * | 1974-05-16 | 1986-06-23 | Mannbro Systems Handelsbolag | SEE CONTINUOUS ALKALIC DELIGNIFICATION OF LIGNOCELLULOSAMENTAL MATERIAL IN TWO OR MULTIPLE STEPS, WHICH ARE LAST WITH Oxygen |
US5066362A (en) * | 1987-12-01 | 1991-11-19 | Kamyr, Inc. | Extended delignification in pressure diffusers |
FI93748B (en) * | 1992-06-08 | 1995-02-15 | Ahlstroem Oy | Method and apparatus for handling the fiber suspension |
US6302997B1 (en) * | 1999-08-30 | 2001-10-16 | North Carolina State University | Process for producing a pulp suitable for papermaking from nonwood fibrous materials |
US20020129911A1 (en) * | 2000-10-16 | 2002-09-19 | Marcoccia Bruno S. | Process and configuration for providing external upflow/internal downflow in a continuous digester |
SE0004050L (en) * | 2000-11-03 | 2001-11-05 | Kvaerner Pulping Tech | Continuous boiling of pulp with net mid-stream flow in the bottom portion of the boiler |
FI120505B (en) * | 2002-07-12 | 2009-11-13 | Stora Enso Oyj | Continuous process for boiling cellulose-based pulp and pulp boiler suitable for the process |
FI20022055A (en) * | 2002-11-19 | 2004-05-20 | Advanced Fiber Tech Aft Trust | Method and apparatus for treating fiber suspension |
FI123023B (en) * | 2009-09-01 | 2012-10-15 | Andritz Oy | Method and apparatus for separating soap |
WO2011102760A1 (en) * | 2010-02-17 | 2011-08-25 | Metso Paper Sweden Ab | Method and system for recycling of rejects in a process for cooking chemical pulp |
-
2014
- 2014-10-31 SE SE1451303A patent/SE539501C2/en unknown
-
2015
- 2015-10-28 EP EP15856135.7A patent/EP3212840B1/en active Active
- 2015-10-28 CA CA2966142A patent/CA2966142A1/en not_active Abandoned
- 2015-10-28 WO PCT/SE2015/051141 patent/WO2016068783A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
EP3212840A4 (en) | 2018-04-11 |
WO2016068783A1 (en) | 2016-05-06 |
SE539501C2 (en) | 2017-10-03 |
EP3212840B1 (en) | 2020-02-05 |
SE1451303A1 (en) | 2016-05-01 |
CA2966142A1 (en) | 2016-05-06 |
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