CA1131441A - Method and device for flake-dryng of cellulose pulp - Google Patents
Method and device for flake-dryng of cellulose pulpInfo
- Publication number
- CA1131441A CA1131441A CA344,781A CA344781A CA1131441A CA 1131441 A CA1131441 A CA 1131441A CA 344781 A CA344781 A CA 344781A CA 1131441 A CA1131441 A CA 1131441A
- Authority
- CA
- Canada
- Prior art keywords
- pulp
- walls
- flow
- flake
- fluffer
- 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
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
- 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
- D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
- D21C9/185—De-watering; Elimination of cooking or pulp-treating liquors from the pulp comprising at least one step where the pulp is suspended in a gaseous medium, e.g. flash drying
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Drying Of Solid Materials (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
ABSTRACT
Method for drying finely divided cellulose pulp by means of hot gases in a flake-drying system. The inner wall surfaces of the system which are in contact with the moist pulp flow are kept at a temperature which is equal to, or higher than, that of the pulp flow.
Method for drying finely divided cellulose pulp by means of hot gases in a flake-drying system. The inner wall surfaces of the system which are in contact with the moist pulp flow are kept at a temperature which is equal to, or higher than, that of the pulp flow.
Description
4~
Our ref: Def 1~8 Method and device for flake-drying of cellulose pulp.
The present invention relates to a method in connection with drying of finely divided cellulose pulp of the chemical, semi-chemical and mechanical types by means of hot gases, such as air, flue gases, steam or mixtures thereof in a flake-drying system. The invention relates also to a device for carrying out the method.
Due to the relatively low costs of investment and opera-tion such drying of cellulose pulps in flake-dryers has obtained increased importance for handling and transporting the cellulose pulp. Prior to the drying the water is removed from the pulp mechanically as far as possible in the press section of a wet machine where a wet sheet is obtained which thereupon is beaten and finely disintegrated in a so-called fluffer.
To facilitate the transport of the pulp through the fluffer and a duct system associated therewith, air of nor-mal temperature is used. An inconvenience which arises in the disintegration of the pulp by uncovering the fibres in a fluffer is that small fibres and fibre fragments are produced which tend to adhere to the inside of the casing of the fluffer and also in the transport ducts behind the same. One has tried to avoid this inconvenience by insulating the walls of the fluffer casing and the transport ducts, but even if the deposits became reduced they could not be avoided total-ly. When the deposits once have begun they grow rapidly andform fibre cakes which have a disturbing effect on the pneumatic transport. Pulsations in the flow of pulp can easily come into existence whereby entire fibre cakes or parts thereof are torn off and disturb the continuous pulp flow.
The main object of the present invention is -to elimi-nate this inconvenience which is achieved thereby that the method and the device according to the invention have been imparted the characteristic features stated in the appended claims.
~, ' : ' ' 4~
The invention will be described nearer in an embodi-ment which is shown in the attached drawin~s.
Figure 1 shows a side view of a fluffer and part of an associated duct system.
Figure 2 shows a section through the top portion of the shown flu~fer which in the embodiment has the shape of a disc refiner.
In the drawings, and in particular in Fig. 1~ there is shown a device 10 for flake-drying of cellulose pulps of the chemical, semi-chemical and mechanical types. The dryin~
is effected with hot gases, e.g. air, flue gases, steam of m;xtures thereof. As the heating costs for drying of pulp constitute an important expense item, it is necessary to remove the water as far as possible mechanically prior to the shown drying step. On a modern wet machine the wet sheet can be brought to a dry content exceeding 50 %. In order to attain this, there must, however, high pressures be applied in the press section of the wet machine, and as a result thereof, the wet sheet becomes compact and the fibres cemented together resulting in that a considerable amount of mechanical energy must be set in to give an acceptable disintegration of the sheet, which amount for various types of pulp and machines can reach 15 - 40 kwh/ton absolutely dry pulp. The beating and disintegration of the pulp sheet is made in so-called fluffers, a kind of disintegrators which may be constructed in various manners, e.g. as hammer mills, tearing appar~atus or disc mills.
The construction ~hich according to the invention has proved to be particularly suitable and which is shown in the drawings consists of a d-isc refiner 12 having horizontally mounted grinding discs with the fixed stator disc on top, whereby the feeding of the d;s;ntegrated wet sheet in an easy mànner can be carried out from above through the central aperture ind;cated diagrammatically by the arrow 13 of the stator disc and the hopper 14 and a tube 16 which is connected to the inlet socket 18 of the disc refiner. Said refiner is arranged on a stand 20 containing driving :.~
144~
units for operation of the machine, the stand resting on a base 22.
As is evident from the section through the top portion of the refiner which is shown in Fig. 2, the grinding discs 24, 26 are mounted, as mentioned, horizontally with the fixed stator disc 24 on top, and the feeding is effected through the central aperture 28 of the stator disc 24. The grinding discs have radially positioned straight knives or ridges, but these may also be shaped curved or subdivided and positioned on the discs in other known manners. The gap between the knives on the rotating disc 26 and the fixed disc 24 can be ~aried between 1 and 5 mms, for example, since different kinds of pulp require different gap widths in order that satisfying uncovering of the fibres shall be obtained. Of course, the refiner and therewith the grinding discs 24, 26 can be mounted in vertical position. This requires, however, other devices for feeding-in of the mate-rial, such as screw feeders or other feeding mechanisms.
Due to the fact that the grinding gap is adjustable, a gap ~0 spacing can be selected which renders the best possible uncovering of fibres. With smail grinding gaps a working of the indi~idual fibres also can be obtained, i~e. a grinding or fibrillation which lowers the freeness of the pulp, alters the pulp quality and i.a. results in an increase of ~5 the strength of the final product.
The casing 12 of the refiner or grinding apparatus is pro~ided with at least one inlet 30 for supply of hot air, fuel gas, steam or mixtures thereof to the casing. Connected to the inlet 30 is a duct 32 for supply of the drying gas, as is indicated by the arrow 34. By use of the described type of pulping machine 12 an excellent dispersion of the pulp in the hot gases is obtained and therewith a rapid drying progress. This implies that drying can be carried out at a lower temperature than hitherto which is of great importance for the quality of ~he pulp. In particular,the low drying temperature is valuable in the drying of mecha-nical pulps which thereby with respect to quality undergo . , . :, . ~ . , -., ., . ~.............................................. .
- . ' ` . ; ' ' :' . :: ~ :
' .' ' ' . ~ ,'` ' '~ ' 4~
small changes only of such qualities as brightness, strength and absorption capacity.
The transport of the pulp through the pulping machine 12 is effected in the shown embodiment by utilization of the hot gases intended for the drying which are supplied from the duct 32 through the inlets 30 and 36 at two dia-metrically opposed places of the disc refiner, thus at four points. By introducing the drying gases into the refiner already, the drying process is initiated in the same. Inspite of the supply of hot gases to the refiner 12, it has become obvious that in connection with an effectively accomplished disintegration of the pulp by uncovering of the fibres there appears the extremely annoying inconvenience that the pro-duced small fibres and fibre fragments together with dust particles have a tendency of sticking to the inside of the rèfiner casing 12 and also in the transport duct 38 for the pulp behind the refiner. This phenomenon appears also in those cases where the inner surfaces of the refiner 12 and the tubular duct 38 have been enamelled or covered with plastic material or when they are made of bare non-corroding material. The difficulties begin to become appreciable with dry contents of the pulp just below 70%, but are particular-ly grave between 50 and 60%. Precipitation of fibrous mate-rial is caused, with great probability, by moisture or condensate which precipitates on the surfaces whereby small fibres are pasted. Another cause for precipitation may also be generation of different electric charges in the particles of the solid phase and the wall material. When precipitations have begun they grow rapidly and form fibre cakes which act disturbingly on the pneumatic transportation. Pulsations in the pulp flow can be generated when entire fibre cakes or parts thereof are torn off and disturb the uniform pulp flow.
If the walls of the grinding casing 12 and the tran-sport duct 38 are insulated, the depositions are reduced obviously, but cannot be avoided completely. According to the invention, however, there is supplied to the walls in the entire system, here represented by the outlet duct 38, `~
.
: . .
. -heat from outside so that the temperature on the inside beco~es equal to, or higher than, the temperature of the pulp flow. Due to this measure no precipitations of the kind described above come into existence.
The supply of heat to the walls can be effected in mAnners known per se, for example by constructing the walls iacketed or with channels for steam, hot water or hot oil (Dowtherm). The walls can be heated electrically by means of radiation boxes or heating grids. In the simplest way, lo however, the heating of the walls is effected by means of the hot gases intended for drying in such a manner that these gases initially are supplied to the jacketed or encased walls of the refiner casing 12, the transport duct 38 and sub-sequently via the apertures 30, 36 formed in the grinding casing to said grinding casing to be used as transport gas and to start the drying process. In this way the refiner 12 is supplied totally or partly with the gas quantity intended for the drying. This is shown diagrammatically for the transport duct 38 which is equipped with a jacket 40 to which a heating medium, such as hot air, is supplied through the socket 42, as is indicated by the arrow 43, and from the jacket 40 is conducted into a duct 44 which is connected to the inlet duct 32 to the refiner 12. In this way, the hot air which heats the duct 38 constitutes also a portion of the dryin9 gases in the refiner 12 as described above. As mentioned, the refiner also may be jacketed to be heated by the hot air or the like, but these parts have been omitted here for the sake of simplicity.
Naturally, the shown embodiment is an example only of carrying out the invention, and the same can be realized otherwise within the scope of the subsequent claims.
_ _ _ .
Our ref: Def 1~8 Method and device for flake-drying of cellulose pulp.
The present invention relates to a method in connection with drying of finely divided cellulose pulp of the chemical, semi-chemical and mechanical types by means of hot gases, such as air, flue gases, steam or mixtures thereof in a flake-drying system. The invention relates also to a device for carrying out the method.
Due to the relatively low costs of investment and opera-tion such drying of cellulose pulps in flake-dryers has obtained increased importance for handling and transporting the cellulose pulp. Prior to the drying the water is removed from the pulp mechanically as far as possible in the press section of a wet machine where a wet sheet is obtained which thereupon is beaten and finely disintegrated in a so-called fluffer.
To facilitate the transport of the pulp through the fluffer and a duct system associated therewith, air of nor-mal temperature is used. An inconvenience which arises in the disintegration of the pulp by uncovering the fibres in a fluffer is that small fibres and fibre fragments are produced which tend to adhere to the inside of the casing of the fluffer and also in the transport ducts behind the same. One has tried to avoid this inconvenience by insulating the walls of the fluffer casing and the transport ducts, but even if the deposits became reduced they could not be avoided total-ly. When the deposits once have begun they grow rapidly andform fibre cakes which have a disturbing effect on the pneumatic transport. Pulsations in the flow of pulp can easily come into existence whereby entire fibre cakes or parts thereof are torn off and disturb the continuous pulp flow.
The main object of the present invention is -to elimi-nate this inconvenience which is achieved thereby that the method and the device according to the invention have been imparted the characteristic features stated in the appended claims.
~, ' : ' ' 4~
The invention will be described nearer in an embodi-ment which is shown in the attached drawin~s.
Figure 1 shows a side view of a fluffer and part of an associated duct system.
Figure 2 shows a section through the top portion of the shown flu~fer which in the embodiment has the shape of a disc refiner.
In the drawings, and in particular in Fig. 1~ there is shown a device 10 for flake-drying of cellulose pulps of the chemical, semi-chemical and mechanical types. The dryin~
is effected with hot gases, e.g. air, flue gases, steam of m;xtures thereof. As the heating costs for drying of pulp constitute an important expense item, it is necessary to remove the water as far as possible mechanically prior to the shown drying step. On a modern wet machine the wet sheet can be brought to a dry content exceeding 50 %. In order to attain this, there must, however, high pressures be applied in the press section of the wet machine, and as a result thereof, the wet sheet becomes compact and the fibres cemented together resulting in that a considerable amount of mechanical energy must be set in to give an acceptable disintegration of the sheet, which amount for various types of pulp and machines can reach 15 - 40 kwh/ton absolutely dry pulp. The beating and disintegration of the pulp sheet is made in so-called fluffers, a kind of disintegrators which may be constructed in various manners, e.g. as hammer mills, tearing appar~atus or disc mills.
The construction ~hich according to the invention has proved to be particularly suitable and which is shown in the drawings consists of a d-isc refiner 12 having horizontally mounted grinding discs with the fixed stator disc on top, whereby the feeding of the d;s;ntegrated wet sheet in an easy mànner can be carried out from above through the central aperture ind;cated diagrammatically by the arrow 13 of the stator disc and the hopper 14 and a tube 16 which is connected to the inlet socket 18 of the disc refiner. Said refiner is arranged on a stand 20 containing driving :.~
144~
units for operation of the machine, the stand resting on a base 22.
As is evident from the section through the top portion of the refiner which is shown in Fig. 2, the grinding discs 24, 26 are mounted, as mentioned, horizontally with the fixed stator disc 24 on top, and the feeding is effected through the central aperture 28 of the stator disc 24. The grinding discs have radially positioned straight knives or ridges, but these may also be shaped curved or subdivided and positioned on the discs in other known manners. The gap between the knives on the rotating disc 26 and the fixed disc 24 can be ~aried between 1 and 5 mms, for example, since different kinds of pulp require different gap widths in order that satisfying uncovering of the fibres shall be obtained. Of course, the refiner and therewith the grinding discs 24, 26 can be mounted in vertical position. This requires, however, other devices for feeding-in of the mate-rial, such as screw feeders or other feeding mechanisms.
Due to the fact that the grinding gap is adjustable, a gap ~0 spacing can be selected which renders the best possible uncovering of fibres. With smail grinding gaps a working of the indi~idual fibres also can be obtained, i~e. a grinding or fibrillation which lowers the freeness of the pulp, alters the pulp quality and i.a. results in an increase of ~5 the strength of the final product.
The casing 12 of the refiner or grinding apparatus is pro~ided with at least one inlet 30 for supply of hot air, fuel gas, steam or mixtures thereof to the casing. Connected to the inlet 30 is a duct 32 for supply of the drying gas, as is indicated by the arrow 34. By use of the described type of pulping machine 12 an excellent dispersion of the pulp in the hot gases is obtained and therewith a rapid drying progress. This implies that drying can be carried out at a lower temperature than hitherto which is of great importance for the quality of ~he pulp. In particular,the low drying temperature is valuable in the drying of mecha-nical pulps which thereby with respect to quality undergo . , . :, . ~ . , -., ., . ~.............................................. .
- . ' ` . ; ' ' :' . :: ~ :
' .' ' ' . ~ ,'` ' '~ ' 4~
small changes only of such qualities as brightness, strength and absorption capacity.
The transport of the pulp through the pulping machine 12 is effected in the shown embodiment by utilization of the hot gases intended for the drying which are supplied from the duct 32 through the inlets 30 and 36 at two dia-metrically opposed places of the disc refiner, thus at four points. By introducing the drying gases into the refiner already, the drying process is initiated in the same. Inspite of the supply of hot gases to the refiner 12, it has become obvious that in connection with an effectively accomplished disintegration of the pulp by uncovering of the fibres there appears the extremely annoying inconvenience that the pro-duced small fibres and fibre fragments together with dust particles have a tendency of sticking to the inside of the rèfiner casing 12 and also in the transport duct 38 for the pulp behind the refiner. This phenomenon appears also in those cases where the inner surfaces of the refiner 12 and the tubular duct 38 have been enamelled or covered with plastic material or when they are made of bare non-corroding material. The difficulties begin to become appreciable with dry contents of the pulp just below 70%, but are particular-ly grave between 50 and 60%. Precipitation of fibrous mate-rial is caused, with great probability, by moisture or condensate which precipitates on the surfaces whereby small fibres are pasted. Another cause for precipitation may also be generation of different electric charges in the particles of the solid phase and the wall material. When precipitations have begun they grow rapidly and form fibre cakes which act disturbingly on the pneumatic transportation. Pulsations in the pulp flow can be generated when entire fibre cakes or parts thereof are torn off and disturb the uniform pulp flow.
If the walls of the grinding casing 12 and the tran-sport duct 38 are insulated, the depositions are reduced obviously, but cannot be avoided completely. According to the invention, however, there is supplied to the walls in the entire system, here represented by the outlet duct 38, `~
.
: . .
. -heat from outside so that the temperature on the inside beco~es equal to, or higher than, the temperature of the pulp flow. Due to this measure no precipitations of the kind described above come into existence.
The supply of heat to the walls can be effected in mAnners known per se, for example by constructing the walls iacketed or with channels for steam, hot water or hot oil (Dowtherm). The walls can be heated electrically by means of radiation boxes or heating grids. In the simplest way, lo however, the heating of the walls is effected by means of the hot gases intended for drying in such a manner that these gases initially are supplied to the jacketed or encased walls of the refiner casing 12, the transport duct 38 and sub-sequently via the apertures 30, 36 formed in the grinding casing to said grinding casing to be used as transport gas and to start the drying process. In this way the refiner 12 is supplied totally or partly with the gas quantity intended for the drying. This is shown diagrammatically for the transport duct 38 which is equipped with a jacket 40 to which a heating medium, such as hot air, is supplied through the socket 42, as is indicated by the arrow 43, and from the jacket 40 is conducted into a duct 44 which is connected to the inlet duct 32 to the refiner 12. In this way, the hot air which heats the duct 38 constitutes also a portion of the dryin9 gases in the refiner 12 as described above. As mentioned, the refiner also may be jacketed to be heated by the hot air or the like, but these parts have been omitted here for the sake of simplicity.
Naturally, the shown embodiment is an example only of carrying out the invention, and the same can be realized otherwise within the scope of the subsequent claims.
_ _ _ .
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In the method of drying cellulose pulp in a flake drying system comprising pulp disintegrating fluffer means and having walls confining the flow of pulp through the system, the improve-ment comprising:
a) passing a stream of a hot gaseous medium into said fluffer means to enhance the flow of consequently entrained dis-integrated pulp particles through said system and to promote heat exchange between said pulp particles and said gaseous medi-um; and b) supplying extraneous heat to the walls confining the flow of pulp to maintain said walls at a temperature not lower than the temperature of the flow of pulp.
a) passing a stream of a hot gaseous medium into said fluffer means to enhance the flow of consequently entrained dis-integrated pulp particles through said system and to promote heat exchange between said pulp particles and said gaseous medi-um; and b) supplying extraneous heat to the walls confining the flow of pulp to maintain said walls at a temperature not lower than the temperature of the flow of pulp.
2. The method according to Claim l,` in which the stream of hot gaseous medium is passed in flushing contact with said walls prior to entering said fluffer means.
3. In a flake-drying system having walls confining the flow of pulp therethrough and in which the pulp is first disintegrated in sealed fluffer means and the disintegrated pulp particles are entrained in a stream of a hot gaseous medium passed into said fluffer means and which stream dries said particles while they are being propelled by said stream through the system in contact with said walls confining the flow of pulp, the improve-ment comprising means for heating said walls to impart thereto a temperature not lower than the temperature of the flow of pulp.
4. A flake drying system according to Claim 3, in which the means for heating the flow confining walls comprises a jacket means surrounding said walls for passing a heating medium over said walls.
5. A flake drying system according to Claim 4, in which the heating medium is gaseous and is passed from said jacket means to said fluffer means.
6. A flake drying system according to Claim 4, in which the means for heating said walls comprises electrical heating means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7901001A SE7901001L (en) | 1979-02-05 | 1979-02-05 | SET AND DEVICE FOR FLING-DRYING CELLULOSAMASSA |
| SE7901001-3 | 1979-02-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1131441A true CA1131441A (en) | 1982-09-14 |
Family
ID=20337206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA344,781A Expired CA1131441A (en) | 1979-02-05 | 1980-01-31 | Method and device for flake-dryng of cellulose pulp |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS55105179A (en) |
| BR (1) | BR8000675A (en) |
| CA (1) | CA1131441A (en) |
| DE (1) | DE3003971A1 (en) |
| FI (1) | FI800334A (en) |
| SE (1) | SE7901001L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2003204780B2 (en) * | 2002-06-28 | 2005-08-18 | Weyerhaeuser Company | Process for producing dried singulated cellulose pulp fibers using a jet drier and injected steam and the product resulting therefrom |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE517372C2 (en) * | 2000-10-06 | 2002-06-04 | Metso Paper Inc | Method and apparatus for separating steam and gas from glued or unpinned fiber pulp produced by a refiner |
| US7334347B2 (en) | 2001-10-30 | 2008-02-26 | Weyerhaeuser Company | Process for producing dried, singulated fibers using steam and heated air |
| US6769199B2 (en) * | 2001-10-30 | 2004-08-03 | Weyerhaeuser Company | Process for producing dried singulated cellulose pulp fibers using a jet drier and injected steam and the product resulting therefrom |
| US6782637B2 (en) * | 2001-10-30 | 2004-08-31 | Weyerhaeuser Company | System for making dried singulated crosslinked cellulose pulp fibers |
| US6748671B1 (en) * | 2001-10-30 | 2004-06-15 | Weyerhaeuser Company | Process to produce dried singulated cellulose pulp fibers |
| US6862819B2 (en) | 2001-10-30 | 2005-03-08 | Weyerhaeuser Company | System for producing dried singulated cellulose pulp fibers using a jet drier and injected steam |
-
1979
- 1979-02-05 SE SE7901001A patent/SE7901001L/en not_active Application Discontinuation
-
1980
- 1980-01-31 CA CA344,781A patent/CA1131441A/en not_active Expired
- 1980-02-04 DE DE19803003971 patent/DE3003971A1/en not_active Withdrawn
- 1980-02-04 BR BR8000675A patent/BR8000675A/en unknown
- 1980-02-04 FI FI800334A patent/FI800334A/en not_active Application Discontinuation
- 1980-02-05 JP JP1236980A patent/JPS55105179A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2003204780B2 (en) * | 2002-06-28 | 2005-08-18 | Weyerhaeuser Company | Process for producing dried singulated cellulose pulp fibers using a jet drier and injected steam and the product resulting therefrom |
Also Published As
| Publication number | Publication date |
|---|---|
| BR8000675A (en) | 1980-10-14 |
| DE3003971A1 (en) | 1980-08-14 |
| SE7901001L (en) | 1980-08-06 |
| FI800334A (en) | 1980-08-06 |
| JPS55105179A (en) | 1980-08-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |