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WO1997039177A1 - Dispositif d'alimentation d'un materiau humide, fonctionnant sous pression gazeuse elevee - Google Patents

Dispositif d'alimentation d'un materiau humide, fonctionnant sous pression gazeuse elevee Download PDF

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Publication number
WO1997039177A1
WO1997039177A1 PCT/SE1996/000487 SE9600487W WO9739177A1 WO 1997039177 A1 WO1997039177 A1 WO 1997039177A1 SE 9600487 W SE9600487 W SE 9600487W WO 9739177 A1 WO9739177 A1 WO 9739177A1
Authority
WO
WIPO (PCT)
Prior art keywords
feeder
outlet opening
pipe
feeding device
ofthe
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.)
Ceased
Application number
PCT/SE1996/000487
Other languages
English (en)
Inventor
Kjell Nilsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
REGALCO ENGINEERING AB
Original Assignee
REGALCO ENGINEERING AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26662155&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1997039177(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to SE9403616A priority Critical patent/SE503502C2/sv
Application filed by REGALCO ENGINEERING AB filed Critical REGALCO ENGINEERING AB
Priority to PCT/SE1996/000487 priority patent/WO1997039177A1/fr
Priority to EP96920080A priority patent/EP0912793A1/fr
Publication of WO1997039177A1 publication Critical patent/WO1997039177A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • D21C7/00—Digesters
    • D21C7/06—Feeding devices

Definitions

  • the present invention refers to a feeding device, working under high gas pressure, for wet material for example pre-hydrolysed hgnocellulosic material.
  • a device of this kind one should be able to feed the material from a unit with atmospherical pressure to a unit with relatively high pressure, or the other way around, from a pressurized unit to another pressurized unit, with higher or lower pressure.
  • It can for example be a question of feeding pre-hydrolysed hgnocellulosic material, as a 30 % mixture with water, from one unit at a pressure of 1,3 MPa to an other unit with the pressure of 2,8 MPa, which corresponds to temperatures of 190 °C and 228 °C respectively.
  • the material flow can be approximately 23 tons per hour.
  • the volume ofthe two units can be approximately 6 m 3 . Therefore the quantity of steam, released by a sudden pressure drop or a so called blow-back, due to a leakage over the feeding unit, will be considerable with risk for serious damages and near-accidents.
  • the goal for the invention is to achieve a feeding system, ofthe type described by way of introduction, whereby the risks for leakage or blow backs have been ehminated in an uncomplicated and effective way.
  • a cell-feeder of gear wheel type, has been arranged with a continuous feed flow of material so that the cell-feeder is kept filled continuously.
  • the feed out of material from the cell-feeder will also be a smooth, continuous, flow that is then conveyed into a pipe towards its outlet end.
  • This is arranged so that the material will be compressed inside the pipe either by the fact that the pipe is long enough, to give the material column the sufficient compression, or for the reason that the material has to be pressed out between the outlet end ofthe pipe and a flexible counter weight, that aims to keep the outlet opening closed.
  • the material plug formed in this way, together with the material in the cell-feeder and at its inlet side provides an effective gas-tight sealing.
  • figure 1 shows a system for the feeding of hgnocellulosic material from a pressurized unit to an other pressurized unit
  • figure 2 shows a system for feeding of material into a pressurized dryer
  • figure 3 shows a system for discharge of material from a pressurized dryer.
  • the feeding system shown in figure 1, is part of a plant for dilute acid hydrolysis of hgnocellulosic material at high temperature.
  • the material is fed forward by means of a conventional screw and also in the pre-feeder 3 there is a screw, driven by a motor 4, which is arranged to be driven so that the material is always pressed against the inlet opening ofthe cell- feeder 5.
  • the inlet pipe 7 to the digester 10 is directed vertically upwards. If the height ofthe material column, from the outlet ofthe cell-feeder to the outlet ofthe pipe 7 in the digester 10, is sufficient, with respect to the property ofthe material and existing operating conditions, to allow the material column, together with the material in the cell-feeder 5 and in the pre-feeder 3, to form a gas-tight sealing even when the cell-feeder 5 is stopped, the pipe 7 can simply end with an opening 11 in the digester 10. If there is a risk for a blow back when the cell- feeder stops the opening 1 1 should be equipped with one flexible sealing 8, working as a non return valve.
  • the flexible sealing 8 has to be equipped with a springy device, for example a pneumatic spring 9, that with the proper force is pressing against the opening 11 creating a counter pressure which the material column has to overcome before it can leave the pipe 7 and be further transported into the digester 10 by the transport screw 13, driven by a motor 12.
  • a springy device for example a pneumatic spring 9 that with the proper force is pressing against the opening 11 creating a counter pressure which the material column has to overcome before it can leave the pipe 7 and be further transported into the digester 10 by the transport screw 13, driven by a motor 12.
  • the cell-feeder 5, as well as the pre-feeder 3, are constructed for a working pressure, at least at the level ofthe subsequent vessel in the plant.
  • the cell-feeder 5 is, on top of that, made to handle a counter pressure of at least 2,0 MPa, which with a certain margin, in this case 0,5 MPa, overcomes the theoretical counter pressure. This results in special requirements for the design ofthe gear wheel teeth, as well as for the bearings and the sealing. Any leakage of water from the material can also, for several reasons, not be tolerated.
  • the motor 4 should be a hydrauhc motor which, amongst other things, gives such advantages as a simple torque restriction and a precise control ofthe speed over a wide range.
  • the counter weight will move, with help ofthe force from the hydrauhc spring 9, and press against the opening 11 of the pipe 7 and when the plug of material in the pipes 6, 7, tends to move backwards it will seal the opening.
  • Figure 2 shows a device for the feeding to a pressurized dryer, which principally has the same design as the device according to figure 1. Therefore the same reference numbers are used for equal components, in both devices.
  • This type of dryers so called counter pressure dryers, that works with steam at over pressure needs a feeder and a discharger that seals for the over pressure, which means that material should be fed in and out without any leakage of steam. This might in some cases be achieved with ordinary cell-feeders or plug screws. In some apphcations non of those devices are suitable. This might be due to the fact that the material cannot be compressed into a good enough plug, in a plug screw, or that operating problems, that normally are related to cell-feeders, cannot be accepted.
  • the system is a better alternative specially when the material has a relatively low dry content, under 40 %, or when the material is amorphous as for example, brown coal, bagasse, sludge from sewage plants, cellulosic pulp, grass or fruit residues or sugar beet molasses.
  • sugar beet waste so called molasses i. e. the sohd rest that is left over when the sugar has been extracted as much as possible, is fed at atmospheric pressure by means of a transport screw 20, via a shoot 2, to a pre-feeder 3, which has a transport screw, driven by a motor 4 at a constant speed which correlates to the maximum capacity ofthe dryer. From this the material is fed into a cell-feeder 5 ofthe type which has two counter rotating wheels with tooth formed dogs designed for the feeding ofthe material in the present case. This is driven with a speed adapted to the capacity ofthe dryer.
  • a pressure lock is arranged in the form of a short pipe 7 which has an opening 11 against which, by means of a pneumatic spring 9, a flexibly pivoted counter weight 8 is resting and sealing.
  • the counter weight 8 seals before and under the startmg sequence and makes sure that the plug of material, that is formed in the pipe 7, fills it up and gets a predetermined degree of compression. When this has been achieved the material is pressed passed the counter weight 8 and drops down in a transport screw 21 in the counter pressure dryer 22, where the pressure of 0,3 MPa prevails.
  • the driven parts can be run at constant speed. When big quantities of material are transported to the feeder they can be received and when modest quantities arrive, smaller quantities are fed in. Ifthe flow of material is discontinued the counter weight will successively get nearer the opening 11 and at the end completely close and seal the opening for the pressure in the dryer 22.
  • Figure 3 shows a system for the discharge ofthe dried material from the counter pressure dryer 22, shown in figure 2, that is shown here ending with a cyclone 23 through which the material falls down and is collected on top ofthe inlet of a cell-feeder 5, ofthe same type as earlier mentioned.
  • the pressure lock consists of a material column in the pipe 7, which is directed vertically down and which has an opening 11, directed downwards which, as in the previously examples, is equipped with a counter weight 8 that, by means of a pneumatic spring 9, is kept flexibly pivoted and pressed tight shut against the opening 11.
  • a hood 24 for steam of atmospheric pressure, equipped with a screw conveyor 25 for the discharge ofthe material and an exit pipe for the flash steam, that is released by the rest-moisture in the material in combination with the pressure drop.
  • the energy content in the flash steam can be recovered in a suitable way.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention concerne un dispositif d'alimentation fonctionnant sous une pression élevée de vapeur et destiné à un matériau humide, par exemple un matériau lignocellulosique préalablement hydrolysé. Ce dispositif comprend un système d'alimentation préalable (3), un dispositif d'alimentation (5) de cuve, comportant deux roues à rotation antagoniste et dotées de dents d'entraînement, ainsi qu'au niveau du côté de l'orifice de sortie, une conduite (7) dont l'ouverture (11) de décharge comprend un contrepoids (8) chargé par ressort, afin de maintenir un bouchon de matériau dans la conduite (7) au moyen d'une compression nécessaire, et d'effectuer un scellement étanche au gaz.
PCT/SE1996/000487 1994-10-21 1996-04-16 Dispositif d'alimentation d'un materiau humide, fonctionnant sous pression gazeuse elevee Ceased WO1997039177A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9403616A SE503502C2 (sv) 1994-10-21 1994-10-21 Matningsanordning för fuktigt material under högt gastryck
PCT/SE1996/000487 WO1997039177A1 (fr) 1994-10-21 1996-04-16 Dispositif d'alimentation d'un materiau humide, fonctionnant sous pression gazeuse elevee
EP96920080A EP0912793A1 (fr) 1996-04-16 1996-04-16 Dispositif d'alimentation d'un materiau humide, fonctionnant sous pression gazeuse elevee

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9403616A SE503502C2 (sv) 1994-10-21 1994-10-21 Matningsanordning för fuktigt material under högt gastryck
PCT/SE1996/000487 WO1997039177A1 (fr) 1994-10-21 1996-04-16 Dispositif d'alimentation d'un materiau humide, fonctionnant sous pression gazeuse elevee

Publications (1)

Publication Number Publication Date
WO1997039177A1 true WO1997039177A1 (fr) 1997-10-23

Family

ID=26662155

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000487 Ceased WO1997039177A1 (fr) 1994-10-21 1996-04-16 Dispositif d'alimentation d'un materiau humide, fonctionnant sous pression gazeuse elevee

Country Status (2)

Country Link
SE (1) SE503502C2 (fr)
WO (1) WO1997039177A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008022895A3 (fr) * 2006-08-24 2008-04-10 Spot Spirit Of Technology Ag Système de chargement
WO2016105270A1 (fr) * 2014-12-22 2016-06-30 Valmet Ab Agencement et système à des fins de distribution de matériau de biomasse dans un processus de traitement
WO2020091675A1 (fr) * 2018-10-31 2020-05-07 Valmet Ab Vis de décharge de réacteur

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI64820B (fi) * 1981-09-17 1983-09-30 Rintekno Oy Foerfarande och anordning foer oeverfoering av varmslipmassa fraon separationskammare till behaollare
SE435532B (sv) * 1983-02-22 1984-10-01 Sunds Defibrator Sett och anordning for framstellning av fibermassa fran lignocellulosahaltigt material
SE461919B (sv) * 1988-08-30 1990-04-09 Cellwood Machinery Ab Saett vid behandling av traefibermassa, saerskilt innehaallande returpapper, samt disperger foer genomfoerande av foerfarandet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI64820B (fi) * 1981-09-17 1983-09-30 Rintekno Oy Foerfarande och anordning foer oeverfoering av varmslipmassa fraon separationskammare till behaollare
SE435532B (sv) * 1983-02-22 1984-10-01 Sunds Defibrator Sett och anordning for framstellning av fibermassa fran lignocellulosahaltigt material
SE461919B (sv) * 1988-08-30 1990-04-09 Cellwood Machinery Ab Saett vid behandling av traefibermassa, saerskilt innehaallande returpapper, samt disperger foer genomfoerande av foerfarandet

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008022895A3 (fr) * 2006-08-24 2008-04-10 Spot Spirit Of Technology Ag Système de chargement
WO2016105270A1 (fr) * 2014-12-22 2016-06-30 Valmet Ab Agencement et système à des fins de distribution de matériau de biomasse dans un processus de traitement
CN107000358A (zh) * 2014-12-22 2017-08-01 维美德公司 用于将生物质物料馈送至处理过程的布置和系统
US10385506B2 (en) 2014-12-22 2019-08-20 Valmet Ab Arrangement and system for feeding biomass material to a treatment process
WO2020091675A1 (fr) * 2018-10-31 2020-05-07 Valmet Ab Vis de décharge de réacteur
US12091817B2 (en) 2018-10-31 2024-09-17 Valmet Ab Reactor discharge screw

Also Published As

Publication number Publication date
SE503502C2 (sv) 1996-06-24
SE9403616D0 (sv) 1994-10-21
SE9403616L (sv) 1996-04-22

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