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US20070151682A1 - Method and apparatus for feeding wood chips into a chip bin - Google Patents

Method and apparatus for feeding wood chips into a chip bin Download PDF

Info

Publication number
US20070151682A1
US20070151682A1 US11/637,141 US63714106A US2007151682A1 US 20070151682 A1 US20070151682 A1 US 20070151682A1 US 63714106 A US63714106 A US 63714106A US 2007151682 A1 US2007151682 A1 US 2007151682A1
Authority
US
United States
Prior art keywords
pushing means
length
transfer channel
chip
chips
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.)
Abandoned
Application number
US11/637,141
Other languages
English (en)
Inventor
Rami Lampinen
Antti Tuominen
Lasse Hernesniemi
Tuomo Nykanen
Matti Rosenqvist
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Assigned to METSO PAPER, INC. reassignment METSO PAPER, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NYKANEN, TUOMO, HERNESNIEMI, LASSE, LAMPINEN, RAMI, ROSENQVIST, MATTI, TUOMINEN, ANTTI
Publication of US20070151682A1 publication Critical patent/US20070151682A1/en
Assigned to VALMET TECHNOLOGIES, INC. reassignment VALMET TECHNOLOGIES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: METSO PAPER, INC.
Abandoned legal-status Critical Current

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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 concerns a method and a respective feeding apparatus for feeding chips into a chip bin.
  • the object of the implementation of the method and the construction of the feeding apparatus is to prevent problems discovered with the methods of prior art and the feeding devices implementing the same. These problems include, among others, flow of gases from the bin upstream against the feeding direction of the chips in cases where the chips are treated in the bin with steam or process gases for heating the chips. Also dust formation of the chips when filling the bin has caused problems in the devices of prior art, because the dust also travels upstream against the direction of flow of the chips.
  • a plug moving substantially in the horizontal direction is formed of the chips to be fed, said plug filling the cross-sectional transfer space, preferably for a remarkable length of the transfer space.
  • the chip plug is formed and maintained by means of chips forced to move batchwise, whereby the forcing period extends over a part of the length of the space of progress. This operation causes that the plug moves in the feeding direction only when new chips to be fed come to the pushing device to fill up the plug and push it forward for the length of the filling up in the feeding direction.
  • the chip plug is immovable, as the filling up batches are missing.
  • the chip plug formed in the transfer space however, preventing the flow of the gases. The feeding situation continues when the chip flow returns to the feeding equipment.
  • the batches forming the chip plug in the transfer space can be formed as one batch having a cross section substantially corresponding to the cross sectional area of the transfer space.
  • the feed batches can be formed as a plurality of batches distributed over the cross section of the transfer space and being moved to the feeding direction preferably at least partly nonsimultaneously.
  • the above mentioned substantially horizontal travel of the plug must be in this connection interpreted rather freely, chiefly excluding the gravitational travel only.
  • the path of travel can slightly differ from the horizontal direction, declining or inclining, taken into account, that there must be caused a certain hindrance to motion for the plug for providing the required density of the plug.
  • the length of the transfer space also has influence on the hindrance to motion exerted to the plug.
  • the basic parts of the apparatus are the transfer channel and the inlet connection opening to one end thereof, and the outlet connection at the other end thereof, leading to the chip bin. Between these two connections the transfer channel has a certain length, that is at least in the same range as the diameters of the inlet connection and the outlet connection.
  • transfer elements of chips located in the transfer channel. These transfer elements are according to the characterizing features of the invention, pushing means performing reciprocal movement in the direction of the transfer channel, located onto the opening area of the transfer channel, having a length of stroke substantially shorter than the transfer channel.
  • FIG. 1 shows a schematic drawing of the feeding apparatus in accordance with the invention, as a cutaway side view
  • FIG. 2 shows a cutaway perspective view of the apparatus.
  • the apparatus shown in FIG. 1 comprises a transfer channel 1 having preferably a rectangular cross-section and a length bigger than the height of the cross section.
  • An inlet connection 2 of chips is connected to said channel, at one end thereof, on the upper side, where the chips to be fed are brought with conveyors known in the art, and spilled into the transfer channel.
  • a discharge connection 4 At the opposite end of the transfer channel 1 there is a discharge connection 4 , through which the chips are spilled or discharged from the transfer channel 1 to be led to the chip bin, not shown in the drawing.
  • chip transfer elements 3 comprised of a plurality of pushing means 5 performing reciprocal movement on the first end of the transfer channel.
  • the a total pushing surface of the pushing means 5 corresponds substantially to the cross-sectional area of the transfer channel.
  • the pushing means are preferably acting alternately, whereby at lease one of them is moving out of phase with the others, preferably so that at least one pushing means moves backwards while the others move in the feeding direction.
  • the operational motion of the pushing means can be achieved in a simple and reliable way by means of a crank mechanism 6 operated by a suitable drive equipment.
  • a cylinder-piston mechanism arranged for each pushing means separately or shared by a plurality of pushing means is usable as a drive system.
  • the cylinder-piston mechanism can be pneumatic or hydraulic.
  • a hydraulic and a pneumatic drive gives more freedom for arranging the mutual movements of the pushing means, because each pushing means can be controlled independently from the other pushing means.
  • a stroke length S can be provided for the pushing means, having a length of a range of about 1 ⁇ 2 of the transfer channel length L.
  • the stroke length S of the pushing means is of the same range of the height of the pushing means.
  • a stopper 7 delimiting the upper surface of the ship flow, said stopper 7 having preferably an adjustable location.
  • This stopper can act as a densing means of the chip plug in the transfer channel 1 , when the chips are moving under it forced by the pushing means 5 .
  • the transfer channel can also be formed converging in the feeding direction by mounting one or some of its walls inclined. The inclination of the walls can also be adjustable for adapting the operation of the apparatus for different situations.
  • the transfer channel can be divided with walls 9 parallel to the direction of the channel into compartments 8 each of them having their own pushing means 5 .
  • the pushing means 5 has substantially the same width and height as the compartment 8 .
  • the walls act for their part as guides for the pushing means, but the guiding can also be implemented with rails mounted on the bottom of the channel and adapted to the respective grooves in the pushing means 5 .
  • the chip feeding apparatus in accordance with the present invention is also self-adjusting in the operation.
  • the pushing means 5 are not able to push new material to the transfer channel 1 , but the chip plug made by the pushing means 5 remains in the transfer channel 1 preventing the gases and dust from coming to the inlet connection 2 .
  • Remaining of the chip plug dense in the transfer channel can be assisted with an apparatus, where the pushing means 5 are hydraulic or pneumatic separately used, whereby each pushing means are movable to its most extended position to support the chip plug.
  • a gravity-operated hatch system 10 intended for acting as a non-return valve in situations, where the chip space coming after the discharge connection 4 is clearly pressurized, and the chip feed for some reason stops from the inlet connection 2 .
  • the density of the chip plug sets substantially to the same in different loading situations of usage, whether there is more or momentarily less chip feed.
  • the feeding amount is adjusted by means of the speed control of the crank mechanism 6 or correspondingly by means of a periodical operation of the hydraulic or pneumatic drive.

Landscapes

  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
US11/637,141 2006-01-02 2006-12-12 Method and apparatus for feeding wood chips into a chip bin Abandoned US20070151682A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20060004A FI121791B (fi) 2006-01-02 2006-01-02 Menetelmä ja laite hakkeen syöttämiseksi siiloon
FI20060004 2006-01-02

Publications (1)

Publication Number Publication Date
US20070151682A1 true US20070151682A1 (en) 2007-07-05

Family

ID=35883818

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/637,141 Abandoned US20070151682A1 (en) 2006-01-02 2006-12-12 Method and apparatus for feeding wood chips into a chip bin

Country Status (5)

Country Link
US (1) US20070151682A1 (fi)
AT (1) AT503102B1 (fi)
CA (1) CA2572014C (fi)
FI (1) FI121791B (fi)
SE (1) SE531882C2 (fi)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4185567A (en) * 1977-04-06 1980-01-29 Hans Grossniklaus Wood-fired furnace assembly with automatic fire chamber charger
US4358418A (en) * 1979-08-09 1982-11-09 Anton Heggenstaller Method and apparatus for making compressed composite bodies of plant particles and binder
US5766418A (en) * 1996-09-13 1998-06-16 Ahlstrom Machinery Inc. Handling fibrous material used to produce cellulose pulp
US20040261670A1 (en) * 2003-06-26 2004-12-30 Raymond Dueck Biomass gasification system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4185567A (en) * 1977-04-06 1980-01-29 Hans Grossniklaus Wood-fired furnace assembly with automatic fire chamber charger
US4358418A (en) * 1979-08-09 1982-11-09 Anton Heggenstaller Method and apparatus for making compressed composite bodies of plant particles and binder
US5766418A (en) * 1996-09-13 1998-06-16 Ahlstrom Machinery Inc. Handling fibrous material used to produce cellulose pulp
US20040261670A1 (en) * 2003-06-26 2004-12-30 Raymond Dueck Biomass gasification system
US7228806B2 (en) * 2003-06-26 2007-06-12 Vidir Machine, Inc. Biomass gasification system

Also Published As

Publication number Publication date
AT503102A2 (de) 2007-07-15
AT503102B1 (de) 2011-02-15
SE531882C2 (sv) 2009-09-01
CA2572014C (en) 2014-10-14
FI20060004L (fi) 2007-07-03
SE0602706L (sv) 2007-07-03
FI121791B (fi) 2011-04-15
FI20060004A0 (fi) 2006-01-02
CA2572014A1 (en) 2007-07-02

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Legal Events

Date Code Title Description
AS Assignment

Owner name: METSO PAPER, INC., FINLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LAMPINEN, RAMI;TUOMINEN, ANTTI;HERNESNIEMI, LASSE;AND OTHERS;REEL/FRAME:018696/0041;SIGNING DATES FROM 20061102 TO 20061116

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION

AS Assignment

Owner name: VALMET TECHNOLOGIES, INC., FINLAND

Free format text: CHANGE OF NAME;ASSIGNOR:METSO PAPER, INC.;REEL/FRAME:032551/0426

Effective date: 20131212

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