CN102076905B - Pulp drying machine and method for drying a pulp web - Google Patents
Pulp drying machine and method for drying a pulp web Download PDFInfo
- Publication number
- CN102076905B CN102076905B CN2009801243794A CN200980124379A CN102076905B CN 102076905 B CN102076905 B CN 102076905B CN 2009801243794 A CN2009801243794 A CN 2009801243794A CN 200980124379 A CN200980124379 A CN 200980124379A CN 102076905 B CN102076905 B CN 102076905B
- Authority
- CN
- China
- Prior art keywords
- supporting network
- pulp web
- nip
- pulp
- circulation
- 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.)
- Expired - Fee Related
Links
- 238000001035 drying Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000000694 effects Effects 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 238000012797 qualification Methods 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 description 10
- 238000006297 dehydration reaction Methods 0.000 description 10
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/04—Arrangements thereof
- D21F3/045—Arrangements thereof including at least one extended press nip
Landscapes
- Paper (AREA)
- Drying Of Solid Materials (AREA)
Abstract
A pulp drying machine comprises a press (P1) and a circulation of a continuous supporting wire (2) that is permeable to water and that is introduced together with a pulp web (W) between press surfaces limiting a press nip, for removing water from the web towards the supporting wire (2). Dewatering means are provided on the opposite side of the pulp web (W), seen from the supporting web, for dewatering the web in the opposite direction. A circulation of a dewatering felt (1a) is placed within the circulation of the supporting wire (2) and introduced between the supporting wire (2) and the press surface that limits the press nip. The press surfaces of the press (P1) constitute a long nip.
Description
Technical field
The present invention relates to a kind of circulation that comprises squeezing part and continuous supporting network so that pulp web along the pulp dryer of the direction dehydration of supporting network; Supporting network be porous and be guided limiting between the pressure surface of nip with pulp web to be dried; Wherein, Dewater unit is arranged on the opposition side of the pulp web when supporting network is observed, to make the pulp web dehydration along opposite direction.
The invention still further relates to a kind of method that is used for dry pulp web; Wherein pulp web is guided through nip with the continuous supporting network of porous, and wherein the effect of the dewater unit through being arranged in opposition side removes via supporting network and along opposite direction water from pulp web.
Background technology
In document WO 00/31336, proposed a kind of example of pulp dryer, it comprises: the forming section that is used to make the dehydration of pulp suspension thing; And the press section after forming section, be used for dewatering through the pulp web that is formed by suspended matter is carried out mechanical expression.In this pulp dryer, these forming sections and press section constitute so-called green end, and it also is a theme of the present invention.
In said document, the supporting network of the forming section of pulp dryer also is guided first nip through press section.Therefore, except that the dehydration equipment based on the pressure reduction in the forming section, wet end also comprises and is used for the squeezing part (press) that in the time only can not successfully dewatering through pressure reduction, dewaters.Usually, the first squeezing part comprises the assembly that is provided with following order (from bottom to up): pressure roller, net, pulp web, press felt (press felt) and other pressure roller.Also be provided with the squeezing part that does not have felt.In the squeezing part, implement dehydration along both direction from pulp web.In the circulation of suction felt, the water that removes from pulp web is absorbed by felt along a direction, and the water that absorbs is removed from the suction felt by vacuum aspirator.On other direction, water is removed to net via net and reclines in the groove or blind hole of the pressure roller that are provided with.
In this squeezing part, found to get into the suction felt than getting in the pressure roller more effective via the net dehydration through dehydration.On the other hand, if the pressure roller of the supporting network setting that reclines are suction roll (suction roll), it is very effective then the squeezing part, dewatering via supporting network from pulp web.
The end of and press section that squeeze forces pressure roller very big very high at the dry matter content of pulp web uses smooth roll (smooth roll) sometimes.In the most modern drying machine, last squeezing part is generally long nip press spare, that is, so-called shoe press spare, but and adjoining land two shoe press spares are set.Last squeezing part is generally felt squeezing part, and wherein described like said open source literature, felt is arranged on each side of pulp web.
After forming section, the dry matter content of pulp web is 20% to 25% the order of magnitude, and after the first shoe press spare, the dry matter content of pulp web is about 40% to 45%, and after the second shoe press spare, the dry matter content of pulp web is about 50% to 55%.
Summary of the invention
The objective of the invention is to improve the drying of pulp web in press section, and reduce in the drying of implementing through evaporation subsequently demand thus energy.In order to realize this purpose; Principal character according to drying machine of the present invention is; Be provided with the circulation of suction felt in the inboard of the circulation of supporting network; Circulating in supporting network and limiting between the pressure surface of nip of this suction felt is guided, and is also that according to the principal character of drying machine of the present invention the pressure surface of squeezing part constitutes long nip press.Principal characteristic features of the method according to the invention is; Be arranged on the supporting network of porous and limit between the pressure surface of nip and be provided with the felt that absorbs the water that flows through supporting network; Principal characteristic features of the method according to the invention is that also it is long nip press that pulp web, supporting network and felt are guided the nip that passes through.
In nip, the supporting network of porous abuts in first side of pulp web.The water of pulp web is removed in the suction felt via this supporting network.This suction felt can abut in second side, and water is inhaled into from pulp web in this suction felt.Therefore, can discharge the water that from pulp web, extrudes preferably along both direction.
Find pleasantly surprisedly, compare that the felt that is positioned at behind the net is more effective aspect dehydration with groove or perforation in the roller of contact net.Compare with traditional prior art, the present invention has increased the dry matter content of the pulp web that leaves the squeezing part.In the test of carrying out, find: when the circulation of felt was introduced into circulation inboard of net of squeezing part, the dry matter content of the pulp web after shoe press spare was increased to 48% from 42.6%.This effect possibly be because: net makes water from pulp web, flow out in the entering felt, and felt receives the water that removes better than fluted roller.Even after nip, the suction felt is still preserved water, yet, although between the groove of roller and pulp web, have net, be easy to absorbed once more by pulp web from the water of the groove of roller.
The present invention has saved energy and cost, because obvious than making the pulp web dehydration through the evaporation in drier still less through the energy that press dewatering consumed.Another advantage that will mention is: direct into through the felt that will absorb water between the pressure surface of supporting network and qualification nip, can more freely select to press the surface; That is to say that pressing the surface can be plain roller (smooth-faced roll), and even is stationary member.
Description of drawings
Below, describe the present invention in more detail with reference to accompanying drawing, accompanying drawing shows the schematic side elevation according to the press section of drying machine of the present invention.
The specific embodiment
The product of the pulp dryer that below will describe is with the raw material that act on papermaking, usually as the fiber papermaking part of raw materials that supplies to paper machine.For example, if carry out papermaking, then need in pulp dryer pulp dryer to avoid transport of water in position away from the pulp production place.
Press section shown in the figure is the part of pulp dryer.In pulp dryer, the paper pulp that suspends in water is dried to and makes its ability by the dry matter content that easily transports.Through drying, can be used as the raw-material pulp web W in the paper technology subsequently.Handle and conveying in order to simplify, pulp web can for example be cut into sheet material.
In the cellulose drying machine, the pulp web that suspends in water at first is fed into forming section, in forming section; Net through the porous of advancing dewaters; For example, dewater through two nets that relatively move, suspended matter is fed between the said net that relatively moves.After forming section, the pulp web that has formed fiber web is further dehydrated through mechanical expression in press section, and in drying section, carries out last drying through the water of evaporation pulp web.
Press section comprises the first squeezing part P1, is being directed on the supporting network 2 that the pulp web W that forming section is shaped is moving along equidirectional among the first squeezing part P1.Supporting network 2 is from the initial wet net of operation always of forming section; In other words, at first water is leached via above-mentioned net from paper pulp through squeezing.Press section comprises nip, and in nip, pulp web is under pressure so that dewater through mechanical expression.Through the pressure surface that can form, in direction upper limit level pressure district perpendicular to the pulp web W plane by the surface of the live-rollers that squeezes part.Squeezing part P1 shown in the figure is a shoe press spare, wherein presses the surface to constitute long nip press.In the embodiment of accompanying drawing, press shoe (press shoe) is formed in the concave shape on the pressure surface in the top roll that squeezes part P1.Delivered between pulp web W supporting network 2 and the top suction felt 1 below; Pulp web W is guided through nip; After this pulp web separates with the suction felt with supporting network; And be introduced in the second squeezing part P2 of press section, in the second squeezing part, pulp web up and down between the felt 1 by delivery through corresponding nip.Supporting network 2 turns back to the forming section of pulp dryer.Thus, supporting network 2 forms and supplies the circulation of net with the closed-loop motion.
In the circulation of supporting network 2 in the first squeezing part P1, the circulation of suction felt 1a is set to operation through pressing down the nip between surface (lower roll) and the supporting network 2.Suction felt 1a absorbs the water that squeezes out and flow through supporting network 2 from pulp web W effectively.Lower roll not necessarily need have groove or perforation, thereby can more freely select the structure of lower roll.On the other hand, if the roller surface below the suction felt 1a is provided with groove, bores a hole or is used to receive other structure of water, the water that then possibly rest in these grooves will no longer bedew pulp web, and adhesional wetting suction felt only.Water that the opposite side of pulp web is squeezed out will be in known manner by operation through pulp web W with on press nip between the surface on 1 absorption of suction felt.
Test case through following is described the present invention:
Test machine is used to test the setting of the felt between pressure roller and the net.In test, use shoe press spare, shoe press spare is included in the boots at top and side off the net, at the fluted roller of bottom.The effect of suction felt is to receive the water that from pulp web, removes via net.The following execution tested: at first carry out the benchmark operation with standard machine notion (normal machine concept), subsequently press felt is installed in the interior circulation of the net in machine, utilize corresponding test run pulp web to carry out identical test series once more.Test result is as follows:
Benchmark operation test run
Net spee m/min 200 200
Every Gram Mass (g/m
2) 1,000 1000
Dry % 30.6 31.1 before squeezing
Dry % 42.6 48.0 after squeezing
According to the test run result, the press felt that is installed in the squeezing part of wet end can realize dehydration very effectively.The result of dry matter content is the mean value of test point.
Claims (8)
1. pulp dryer; Comprise squeezing part (P1) and continuous supporting network (2) circulation so that pulp web dewater towards said supporting network (2); Said supporting network be porous and be guided limiting between the pressure surface of nip with pulp web to be dried (W); Wherein, dewater unit is arranged on the opposite side of said pulp web (W) when said supporting network is observed in order to remove water along opposite direction from said pulp web, it is characterized in that; Be provided with the circulation of suction felt (1a) in the inboard of the circulation of said supporting network (2), be guided between the said pressure surface that circulates in said supporting network (2) and the said nip of qualification of this suction felt (1a); Its characteristic is that also the said pressure surface of said squeezing part (P1) constitutes long nip press.
2. drying machine according to claim 1 is characterized in that, said squeezing part (P1) is a shoe press spare.
3. drying machine according to claim 1 is characterized in that, said supporting network (2) is the wet net that comes from the forming section operation, and the circulation of said suction felt (1a) is arranged on the inboard of the circulation of said supporting network.
4. drying machine according to claim 2 is characterized in that, said supporting network (2) is the wet net that comes from the forming section operation, and the circulation of said suction felt (1a) is arranged on the inboard of the circulation of said supporting network.
5. according to each described drying machine in the claim 1 to 4; It is characterized in that; Said dewater unit on the opposition side of said pulp web (W) is made up of suction felt (1); Wherein, the circulation of the said supporting network (2) of the circulation of said suction felt (1) and porous is together with being guided between the said pressure surface that is limiting said nip at the pulp web (W) between said suction felt and the said supporting network.
6. method that is used for dry pulp web (W); Wherein said pulp web is guided through nip with the continuous supporting network (2) of porous; Wherein, Effect through being positioned at the dewater unit on the opposition side removes via said supporting network and along opposite direction water from said pulp web, it is characterized in that, between the said supporting network (2) of porous and the pressure surface that limits said nip, is provided with the felt (1a) that the water of said supporting network (2) is flow through in absorption; Its characteristic is that also it is long nip press that said pulp web (W), said supporting network (2) and said felt (1a) are guided the said nip that passes through.
7. method according to claim 6 is characterized in that, said pulp web is guided through said nip with the said supporting network (2) of forming section.
8. according to claim 6 or 7 described methods; It is characterized in that; Said pulp web is guided through said nip with the continuous bracing or strutting arrangement in its both sides; Wherein, porous and abut in first side of said pulp web (W) via its said supporting network (2) that removes water from said pulp web, and abut in second side of said pulp web (W) from the felt (1) that said pulp web absorbs water.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20085668 | 2008-06-27 | ||
| FI20085668A FI20085668L (en) | 2008-06-27 | 2008-06-27 | Drying machine for cellulose and method for drying a pulp web |
| PCT/FI2009/050573 WO2009156593A1 (en) | 2008-06-27 | 2009-06-25 | Pulp drying machine and method for drying a pulp web |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102076905A CN102076905A (en) | 2011-05-25 |
| CN102076905B true CN102076905B (en) | 2012-10-03 |
Family
ID=39589429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801243794A Expired - Fee Related CN102076905B (en) | 2008-06-27 | 2009-06-25 | Pulp drying machine and method for drying a pulp web |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN102076905B (en) |
| AT (1) | AT508814B1 (en) |
| DE (1) | DE112009001249T5 (en) |
| FI (1) | FI20085668L (en) |
| WO (1) | WO2009156593A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI126860B (en) * | 2015-06-05 | 2017-06-30 | Valmet Technologies Inc | Pulp dryer end wall and pulp dryer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0665328A1 (en) * | 1990-10-11 | 1995-08-02 | Beloit Technologies, Inc. | Papermaking apparatus for pressing and drying a web |
| CN1625628A (en) * | 2002-01-29 | 2005-06-08 | 梅特索纸业有限公司 | Processing device and method of operating the device for processing a coated or uncoated fibrous web |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI982540A (en) * | 1998-11-24 | 2000-05-25 | Valmet Corp | Process for drying cellulose |
| FI115307B (en) * | 2000-11-06 | 2005-04-15 | Metso Paper Inc | Press section in a cardboard machine fitted with prepress |
-
2008
- 2008-06-27 FI FI20085668A patent/FI20085668L/en not_active Application Discontinuation
-
2009
- 2009-06-25 CN CN2009801243794A patent/CN102076905B/en not_active Expired - Fee Related
- 2009-06-25 WO PCT/FI2009/050573 patent/WO2009156593A1/en active Application Filing
- 2009-06-25 DE DE112009001249T patent/DE112009001249T5/en not_active Withdrawn
- 2009-06-25 AT ATA9208/2009A patent/AT508814B1/en not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0665328A1 (en) * | 1990-10-11 | 1995-08-02 | Beloit Technologies, Inc. | Papermaking apparatus for pressing and drying a web |
| CN1625628A (en) * | 2002-01-29 | 2005-06-08 | 梅特索纸业有限公司 | Processing device and method of operating the device for processing a coated or uncoated fibrous web |
Also Published As
| Publication number | Publication date |
|---|---|
| FI20085668L (en) | 2009-12-28 |
| AT508814A3 (en) | 2012-12-15 |
| CN102076905A (en) | 2011-05-25 |
| FI20085668A0 (en) | 2008-06-27 |
| AT508814B1 (en) | 2013-02-15 |
| WO2009156593A1 (en) | 2009-12-30 |
| AT508814A2 (en) | 2011-04-15 |
| DE112009001249T5 (en) | 2011-05-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20170625 |