CN103270214B - The method controlling pulping process with feed-forward mode - Google Patents
The method controlling pulping process with feed-forward mode Download PDFInfo
- Publication number
- CN103270214B CN103270214B CN201180061867.2A CN201180061867A CN103270214B CN 103270214 B CN103270214 B CN 103270214B CN 201180061867 A CN201180061867 A CN 201180061867A CN 103270214 B CN103270214 B CN 103270214B
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- Prior art keywords
- wood flour
- digester
- wood
- steeper
- delivered
- Prior art date
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Links
- 238000000034 method Methods 0.000 title claims abstract description 79
- 230000008569 process Effects 0.000 title claims abstract description 45
- 238000004537 pulping Methods 0.000 title claims abstract description 28
- 239000002023 wood Substances 0.000 claims abstract description 97
- 235000013312 flour Nutrition 0.000 claims abstract description 66
- 239000000126 substance Substances 0.000 claims abstract description 16
- 230000008859 change Effects 0.000 claims description 20
- 238000010025 steaming Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 9
- 239000002994 raw material Substances 0.000 description 13
- 230000001276 controlling effect Effects 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000000123 paper Substances 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000002655 kraft paper Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052979 sodium sulfide Inorganic materials 0.000 description 3
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 239000007799 cork Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 102100030386 Granzyme A Human genes 0.000 description 1
- 101001009599 Homo sapiens Granzyme A Proteins 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- OFPXSFXSNFPTHF-UHFFFAOYSA-N oxaprozin Chemical compound O1C(CCC(=O)O)=NC(C=2C=CC=CC=2)=C1C1=CC=CC=C1 OFPXSFXSNFPTHF-UHFFFAOYSA-N 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000011282 treatment 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
- D21C1/00—Pretreatment of the finely-divided materials before digesting
-
- 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
-
- 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
- D21C3/228—Automation of the pulping 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
- D21C7/00—Digesters
- D21C7/12—Devices for regulating or controlling
Landscapes
- Paper (AREA)
Abstract
The present invention discloses the method controlling pulping process, wherein wood flour is delivered to steeper and/or digester, process described wood flour herein with the serosity comprising chemicals.According to the inventive method, calculate the ratio between the actual mass flow being delivered to the measurement of moist wood flour of steeper or digester and the estimation mass flow of the dried wood chips that is delivered to steeper or digester.Described ratio is used for controlling pulping process.Described method allows to the supply with feed-forward mode On-line Control such as chemicals, serosity to wood ratio and slurrying temperature.
Description
Technical field
The method that the present invention relates to control pulping process, is wherein delivered to steeper or digestion by wood flour
Pond (digester), processes described wood flour herein with the serosity comprising chemicals.
Background technology
In chemical pulping process, wood flour is used at chemicals with the pressure and temperature raised in digester
Reason, lignin fiber being bonded together with dissolving.Current main pulping process is Kraft method,
Wherein process wood flour with the mixture of the sodium hydroxide and sodium sulfide that are referred to as white liquor.
The consumption of the chemicals used in pulp quality and pulping process depends highly on raw material, i.e. wood
Bits.The water capacity of wood flour and other character can due to such as seasonal variations, different wood flours stack arrange and
Use seeds and change.The change of raw material makes it difficult to the accurate of the chemicals of setting digester
Dosage.The commonly used chemicals exceeding needs, this is all harmful from the perspective of economy and environment.
Also disclose in CA919289 for controlling the system of continuous digester.
In conventional chemical pulping process, contain based on the however, residual base derived from pulp properties or cooking waste liquor
The information of the measured value of amount controls described process, i.e. described process controls in feedback fashion.This way
Footpath cannot be complied with the short-term of wood flour character or change suddenly.In the art, have can be used for measuring former
The business of material character measures system.But, these art methods are usually directed to cost with high investment,
Need long analysis time and/or be insufficient to accurately, and being therefore generally not used for controlling described method.
Therefore, it is still necessary to pulping process simple, the online feedforward.
Summary of the invention
It is an object of the invention to provide for controlling the simple at line method of pulping process.This and other
Advantage the inventive method realizes.
The present invention discloses control pulping process method, wherein wood flour is delivered to steeper and/or
Digester, processes described wood flour herein with the serosity comprising chemicals.The inventive method includes following step
Rapid:
E. estimate to be delivered to the dry of steeper or digester required for realizing desired paper output
The mass flow of dry wood flour,
F. the actual mass flow of the moist wood flour being delivered to steeper or digester is measured,
G. calculate in the actual mass flow of measurement of moist wood flour and the estimation mass flow of dried wood chips
Between ratio,
H. rate control pulping process based on described calculating.
The inventive method allows to feed-forward mode On-line Control such as chemicals such as sodium hydroxide and sulfur
Change sodium to steeper or to the supply of digester, serosity to wood ratio and/or slurrying temperature.?
Verified, by controlling pulping process according to the present invention, improve technology stability and realize the Kappa of paper pulp
The change of value (kappa number) and quality reduces.Described method is simple and need not big investment and becomes
This.Additionally, the valuation during we are currently in use a) calculates predetermined process parameter.Then described ratio is used
Fine setting technological parameter.Therefore, first you create set point, and it uses subsequently in the regulation of technique should
Set point.
According to the second aspect of the invention, it is provided that the method comprised the following steps:
E. the dry density of pending wood flour is estimated,
F. the density of the moist wood flour being delivered to steeper or digester is measured,
G. calculate the dry density of estimation of described wood flour and the measurement of described moist wood flour density it
Between ratio, and
H. rate control pulping process based on described calculating.
According to the third aspect of the invention we, it is provided that the method comprised the following steps:
E. the dry density of pending wood flour is estimated,
F. the density of the moist wood flour being delivered to steeper or digester is measured,
G. calculate the dry density of estimation of described wood flour and the measurement of described moist wood flour density it
Between ratio, its also include with measure dry content correction, and
H. rate control pulping process based on described calculating.
This can use when the change of density of wood prevails.Therefore, measure dry content to provide
The approach that this change is modified.
Detailed description of the invention
The method that the present invention relates to control pulping process, wherein in steeper and/or in digester
Use chemical treatments wood flour.Term used in this application " steeper " can be to be suitable to process any of wood flour
The container of kind, pipeline etc..Pulping process can be such as kraft pulping process, sulphite slurrying
Journey or chemi-thermal mechanical pulping process.Described pulping process can be in batches or continuous slurrying process.
Described method can be such as continuously Kraft pulping process, wherein with the temperature and pressure hydroxide improved
The mixture of sodium and sodium sulfide processes wood flour.
According to the inventive method, calculate at the fresh moist wood flour being delivered to steeper or digester
Actual mass flow and required for realizing desired default paper output be delivered to steeper or
Ratio between the estimation mass flow of the dried wood chips of person's digester.Described ratio, hereinafter referred to as timber
Wood property index (Wood Material Indicator, WMI), can such as be used for controlling supplying to steeper or
The chemicals of person's digester such as sodium hydroxide and the amount of sodium sulfide and/or control the serosity in digester to wood
Material ratio and/or control slurrying temperature.WMI can calculate according to equation 1.
Selectively, WMI can calculate by the following method: removes by the estimation mass flow of dried wood chips
Actual mass flow with moist wood flour.
The estimation mass flow of dried wood chips can calculate by the following method: according to equation 2, with desired
Paper output is divided by steaming and decocting yield.
Paper output is the preset value as target.Paper output in equation above is with dry weight
[kg/s], i.e. 100% weight being dried paper pulp represents.Steaming and decocting yield is by the steaming and decocting of the seeds of slurrying
The estimated value of yield.Such as, the steaming and decocting yield of the estimation of the kraft slurrying of cork is 46%.
Such as, the mass flow of the moist wood flour being delivered to steeper or digester can be broken by using
Bits belt scale (conveyor scale) (preferably), mass flow scanning device (by use X-ray) or
Radiation wood flow flowmeter measurement.The mass flow of the measurement of live wood depend on raw-material water capacity and
Raw-material other character such as density and change.
According to the second aspect of the invention, described pulping process is by using the density at moist fresh wood flour
Actual measured value and dried wood chips density estimated value between ratio control.Dried wood chips close
The estimated value of degree depends on the seeds used.The density of moist fresh wood flour can be surveyed by the following method
Fixed: to measure the weight of wood flour in wood flour feed bin and with described measured value divided by the body of the wood flour in feed bin
Long-pending.If described method is pulping process in batches, then the density of moist fresh wood flour can be by following
Method measures: measure the weight of wood flour in digester in batches and with described measured value divided by digester in batches
In the volume of wood flour.
Wood quality index (WMI) continuous control pulping process can be used.Such as, this can be by with lower section
Method realizes: regulate the chemicals inventory to steeper or digester and/or serosity to wood ratio
And/or slurrying temperature.Steaming and decocting alkaline agent amount can continuously adjust based on WMI value.Serosity can base to wood ratio
Regulate by the following method in WMI: the cooking waste liquor in regulation digester or the interior circulation of cleaning mixture.
When the change of raw material density is higher, can be by wood quality index and the wood flour being delivered to digester
The frequent analysis of dry content be applied in combination, as a third aspect of the present invention reflects.
In this way, by separated from one another for the possible change of humidity and raw material density, and if quality
The change of flow is arranged by the change of raw material density, then this will improve the accurate of technology controlling and process further
Degree.This is based on the condition in producing and the raw material concrete decision of use.
The dry mass flow estimated is calculated by equation 2.Yield in continuous digester system is usual
By cubing such as chip feed worm (chip feeding screw) or wood flour gauge (chip
Meter) control.Based on known each rotary feeding volume, compactedness and the wood flour density of estimation, broken
Bits apparatus for feeding will rotate, at some speed to maintain target output (the dry mass flow of estimation).Pass through
Utilize the wet wood flour flow of the measurement being delivered to digester system measured on wood flour conveyer belt, and combine
The wood flour dry content analyzed and the known volume feeding the wood flour to digester system (are measured by wood flour
The rotary speed of equipment is given), can the wet wood flour density of computation and measurement:
Wet wood flour density=WCF/ (V x FD x rpm)
Wherein, WCF=wet wood flour mass flow (kg/min)
Feed volume (the m that V=rotates every time3)
FD=compactedness
The rotary speed (rpm) of rpm=wood flour measuring equipment
Then from the dry density of following formula computation and measurement:
Dry density=wet wood flour density × the dry content measured.
In this case, WMI is defined as
The dry density of dry density/estimation that WMI=measures
Then the WMI described by ratio above can be used in technology controlling and process.That estimates is dry close
Degree depends on using which kind of raw material.
Additionally, the inventive method uses in feed-forward loop (mode), this feed-forward loop (mode) considers will
What feeds (change of dry matter and moisture being combined to system；In wood flour bulk density
Change in low-down Northern Europe condition (Nordic condition), this method operational excellence).For
The response of change is the most faster.
Hereinafter, by embodiment and referring to the drawings, the present invention be will be described in further detail.
Accompanying drawing explanation
Fig. 1 illustrates that wood raw material flows to the schematic diagram of steeper or digester from wood flour heap.Total matter
Amount flow is preferably by using chip belt scale to measure.By defeated at wood flour for the raw material of fresh moist wood flour
Send and on band (1), be delivered to wood flour hopper (2).By using chip feed worm (3), described material is entered one
Step is delivered to steeper or digester from wood flour hopper (2).The screw rod of chip feed worm (3) rotates
Dry mass flow based on the estimation calculated controls, i.e. it depends on the setting value of paper output.
According to an example of the present invention, it is arranged on wood flour conveyer belt (1) chip belt scale (4) below and surveys continuously
Measure the actual flow of fresh moist wood flour.Owing to the wood flour quality in hopper is held essentially constant, survey
Amount flow on wood flour conveyer belt provides the fresh moist wood being delivered to steeper or digester
The exact value of the actual flow of bits.The fresh flow value measured is sent to the control unit of control system
(5) control unit (5), is schematically shown in figure 3.Also the desiccated wood flow input estimated is controlled
In unit (5).In the controls, by the ratio calculation (WMI) between described flow, and it is used for regulating
Such as it is delivered to alkali inventory and the liquid setting value to wood ratio of steeper or digester.Excellent
Selection of land, Theoretical Calculation flow based on the wood flour being delivered to steeper or digester, i.e. according to control
The traditional method of pulping process processed controls described process further.Therefore, except the tradition control of described process
System, WMI is preferred for regulating certain percent.Therefore, also by the setting value (set point) of Theoretical Calculation
Input in described system.
Fig. 2 illustrates how to determine the example of the WMI being set forth above.
Fig. 3 illustrates the control system of the present invention.Described control system can comprise one or several sub-control
System, for long-term (such as, 24 hours) and/or short-term (such as, 2 hours) change for WMI
Regulate alkali inventory, boiling temperature and/or serosity to wood ratio.The control system that figure 3 illustrates
In system (5), regulation is divided into two loops；One loop is returned for the secular change of WMI and one
Road is for the short term variations of WMI.System (5) can comprise other control unit (6,7), wherein can input
Other variable (v1, v2 ... Vn) or preset value be used for controlling described process, such as alkali inventory is upper
Limit and lower limit, serosity currency, boiling temperature (the H-factor) and alkali inventory etc. to wood ratio.
How Fig. 4 more schematically shows the WMI of the present invention for controlling alkali inventory, and it is only
The example of the controllable parameter of WMI of the application of the invention.
Fig. 5 illustrates that operating WMI controls (seeing the following examples).
Embodiment
Trial run is carried out in Oulu maker (Oulu mill) is during 4 days, wherein shows,
WMI controls to reduce kappa value change.
WMI as soft sensor (soft number) seems available and enough accurate to reduce raw material
The impact of change.It is given in Table 1 below result.
The result that table 1. is tested from 4 days Oulu.Each situation is 4 day run.Raw material is next
From the cork (t/d=metric ton/day) of Scandinavia (Scandinavian).Figure referring also to reflection embodiment
5.Referring also to Fig. 2.
It is given in Table 2 below benefit.
Use the benefit that wood quality index (WMI) controls
The benefit that table 2. is tested from 4 days Oulu
It is described above the multiple embodiments of the present invention, but skilled in the art realises that other
Minor alteration, it will be within the scope of the present invention.The width of the present invention and scope should not shown by any of above
Example embodiment limits, but should limit according only to claims and their equivalent.For
For those skilled in the art of the invention, other side, advantage and modification within the scope of the present invention will
For obviously.Therefore, the invention is intended to contain and be included in claims spirit and scope
Various amendments and equivalent processes.
Any diagram in the accompanying drawings and in description above and description should be considered as exemplary and non-
Restrictive.
The use that word " comprises " in the claims is not excluded for other element or step, and article "
The use of one " or " one " is not excluded for plural number.In different dependent claims, the appearance of feature is originally
Body is not excluded for the combination of these features.Any reference marks in the claims is to be appreciated that for raising
Property, and be not construed as limiting the scope of the invention.
Claims (3)
1. the method controlling pulping process, is wherein delivered to steeper or digester, herein by wood flour
Process described wood flour with the serosity comprising chemicals, said method comprising the steps of:
A. estimate realize desired paper output required for be delivered to described steeper or described in disappear
Change the mass flow of the dried wood chips in pond,
B. the actual mass stream of the moist wood flour being delivered to described steeper or described digester is measured
Amount,
C. calculate at the actual mass flow of described moist wood flour and the estimation quality stream of described dried wood chips
Ratio between amount,
D. rate control pulping process based on described calculating, it includes rate control based on described calculating
Supply is to described steeper or the chemicals of described digester or includes based on described calculating
Serosity in rate control digester is to wood ratio or includes ratio control based on described calculating
Slurrying temperature.
2. the process of claim 1 wherein that the estimated value of described dried wood chips is by with described desired paper
Slurry yield obtains divided by the steaming and decocting yield estimated.
3. the method for any one in claim 12, the mass flow of wherein said moist wood flour is led to
Cross use chip belt scale to measure.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1051361-2 | 2010-12-22 | ||
| SE1051361 | 2010-12-22 | ||
| PCT/SE2011/051534 WO2012087228A1 (en) | 2010-12-22 | 2011-12-16 | A method of controlling a pulping process in a feed-forward manner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103270214A CN103270214A (en) | 2013-08-28 |
| CN103270214B true CN103270214B (en) | 2016-11-16 |
Family
ID=46314243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180061867.2A Active CN103270214B (en) | 2010-12-22 | 2011-12-16 | The method controlling pulping process with feed-forward mode |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP2655731B1 (en) |
| CN (1) | CN103270214B (en) |
| BR (1) | BR112013015837A2 (en) |
| ES (1) | ES2730759T3 (en) |
| PT (1) | PT2655731T (en) |
| UY (1) | UY33828A (en) |
| WO (1) | WO2012087228A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA919289A (en) * | 1970-06-30 | 1973-01-16 | Westinghouse Electric Corporation | System for controlling the feed end of a continuous papermaking digester |
| WO1994020671A1 (en) * | 1993-03-02 | 1994-09-15 | Iggesund Tools Ab | Method for controlling a process by measurement of wood chips |
| CN1179188A (en) * | 1995-03-23 | 1998-04-15 | 西门子公司 | Method and device for process control in cellulose and/or paper manufacture |
| CN1372611A (en) * | 1999-09-10 | 2002-10-02 | 斯托拉·科帕伯格斯·伯格斯拉格斯公司 | Method for production of mechanical pulp |
| CA2495713A1 (en) * | 2002-08-16 | 2004-02-26 | Amec E & C Services Limited | On-line pulp digester control system |
| CN1681992A (en) * | 2002-09-06 | 2005-10-12 | 斯托拉恩索公司 | Method of producing mechanical pulp and the mechanical pulp thus produced |
| EP1846614A1 (en) * | 2005-01-05 | 2007-10-24 | Metso Paper, Inc. | Method for controlling a pulping process |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4239590A (en) * | 1979-01-11 | 1980-12-16 | Kamyr, Inc. | Method of maintaining uniformity of fibrous material fed to a continuous digester |
| US5266159A (en) * | 1991-10-25 | 1993-11-30 | Kamyr, Inc. | Mass flow measurement, preferably for controlling chip feed to a digester |
| US6447639B1 (en) * | 2001-03-05 | 2002-09-10 | Sita Ruby Warren | Process for controlling a digester using real time measurement of moisture content and species of wood |
| US20060278353A1 (en) * | 2005-06-03 | 2006-12-14 | Centre De Recherche Industrielle Du Quebec | Method and apparatus for estimating relative proportion of wood chips species to be fed to a process for producing pulp |
-
2011
- 2011-12-16 ES ES11851854T patent/ES2730759T3/en active Active
- 2011-12-16 CN CN201180061867.2A patent/CN103270214B/en active Active
- 2011-12-16 PT PT11851854T patent/PT2655731T/en unknown
- 2011-12-16 BR BR112013015837A patent/BR112013015837A2/en not_active Application Discontinuation
- 2011-12-16 WO PCT/SE2011/051534 patent/WO2012087228A1/en unknown
- 2011-12-16 EP EP11851854.7A patent/EP2655731B1/en active Active
- 2011-12-21 UY UY0001033828A patent/UY33828A/en not_active Application Discontinuation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA919289A (en) * | 1970-06-30 | 1973-01-16 | Westinghouse Electric Corporation | System for controlling the feed end of a continuous papermaking digester |
| WO1994020671A1 (en) * | 1993-03-02 | 1994-09-15 | Iggesund Tools Ab | Method for controlling a process by measurement of wood chips |
| CN1179188A (en) * | 1995-03-23 | 1998-04-15 | 西门子公司 | Method and device for process control in cellulose and/or paper manufacture |
| CN1372611A (en) * | 1999-09-10 | 2002-10-02 | 斯托拉·科帕伯格斯·伯格斯拉格斯公司 | Method for production of mechanical pulp |
| CA2495713A1 (en) * | 2002-08-16 | 2004-02-26 | Amec E & C Services Limited | On-line pulp digester control system |
| CN1681992A (en) * | 2002-09-06 | 2005-10-12 | 斯托拉恩索公司 | Method of producing mechanical pulp and the mechanical pulp thus produced |
| EP1846614A1 (en) * | 2005-01-05 | 2007-10-24 | Metso Paper, Inc. | Method for controlling a pulping process |
Also Published As
| Publication number | Publication date |
|---|---|
| UY33828A (en) | 2012-06-29 |
| CN103270214A (en) | 2013-08-28 |
| EP2655731A4 (en) | 2017-05-17 |
| WO2012087228A1 (en) | 2012-06-28 |
| PT2655731T (en) | 2019-06-26 |
| EP2655731B1 (en) | 2019-05-08 |
| BR112013015837A2 (en) | 2018-05-15 |
| ES2730759T3 (en) | 2019-11-12 |
| EP2655731A1 (en) | 2013-10-30 |
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