Patents Assigned to Andritz Oy
  • Patent number: 8157966
    Abstract: An apparatus in connection with wire water treatment in the approach system of a paper machine, board machine or corresponding web formation machine, which apparatus includes a deaeration tank connected to devices for generating a vacuum inside the deaeration tank. At least one wire water feed pipe extends into the tank, which pipe opens into a vacuum space above the liquid surface level in the tank. A wire water discharge duct is connected to the bottom part of the tank. The feed pipe extends above the liquid level in the tank so that the wire water overflows the edge of the feed pipe onto the liquid level in the tank and the wire water discharge conduit extends downward and is connected to a pump.
    Type: Grant
    Filed: April 2, 2008
    Date of Patent: April 17, 2012
    Assignee: Andritz Oy
    Inventors: Jouni Parviainen, Ari Pelkiö, Ari Vilpponen
  • Patent number: 8157967
    Abstract: An arrangement in screening apparatuses of the pulp and paper industry, including a conduit for removing reject formed in a screening process. The circulation of material is arranged between the reject removal conduit and the interior of the screening apparatus from the removal conduit into the interior of the screening apparatus via a conduit external to the screening apparatus. When such a by-pass flow is arranged for pulp via external circulation, heavy particles in the layer being diluted are allowed to be separated onto the bottom of the reject removal conduit and therethrough e.g. into a separate junk trap.
    Type: Grant
    Filed: March 16, 2007
    Date of Patent: April 17, 2012
    Assignee: Andritz Oy
    Inventors: Marko Pekkarinen, Eero Honkala
  • Publication number: 20120024426
    Abstract: A debarking mechanism including of rotatable debarking shafts extending parallel to an advancing direction (A) of the logs to be fed therethrough, which are provided with teeth extending beyond the circumferential surface of the shaft. At least the uppermost debarking shaft is moved sideways towards the inner part of the debarking mechanism in such a way that each debarking shaft directs an impact effect on logs colliding with it and moved by the debarking shafts located in a lower position. The circumferential speed of the debarking shaft is selected to be the greater the higher the debarking shaft is positioned. A free passage is arranged for the bark passing over the debarking shaft.
    Type: Application
    Filed: September 19, 2011
    Publication date: February 2, 2012
    Applicant: Andritz OY
    Inventor: Pekka KOKKO
  • Patent number: 8070083
    Abstract: The present invention relates to a method of processing logs by means of an apparatus comprising a transportation level in the advancing direction (P) of the logs, where they are arranged to be transported in a position perpendicular to their advancing direction (P), and where orifice members going therethrough and extending in the advancing direction (P) of the logs. In the method, at least two support member units spaced from each other are arranged below the transportation level whereby each support member unit comprises at least one elongated support member, which is arranged rotatably parallel to the transportation level and perpendicular to the advancing direction (P) and protruding therefrom, and said axis of rotation each support member unit is adapted so that when rotating, the support members protrude through the orifice members above the transportation level whereby the logs are received in one or more receiving spaces formed between the support members protruding above the transportation level.
    Type: Grant
    Filed: January 18, 2007
    Date of Patent: December 6, 2011
    Assignee: Andritz Oy
    Inventor: Pekka Kokko
  • Publication number: 20110280762
    Abstract: A method for treating odorous gases of a chemical pulp mill, according to which method odorous gases are combusted in a separate combustion device and flue gas generated therein is scrubbed. The scrubbed flue gas is led into a recovery boiler. The flue gas is scrubbed in a series of scrubbers wherein scrubbing solution discharged from one scrubber may be fed to a preceding scrubber.
    Type: Application
    Filed: August 20, 2008
    Publication date: November 17, 2011
    Applicant: ANDRITZ OY
    Inventors: Esko Mattelmäki, Kari Saviharju
  • Patent number: 8052839
    Abstract: An apparatus for treating pulp including: at least one liquid-permeable surface rotating around a shaft, onto which surface a pulp layer is formed; a feeder to feed pulp to the apparatus for treatment on the liquid-permeable surface; an internal barrier defining a first pulp treatment section and a second pulp treatment section; the first treatment section receiving from the feeder a first type of pulp and the second treatment section receiving from the feeder a second type of pulp, wherein the first type of pulp is supplied to the feeder from a first pulp treatment stage in a pulping system and the second type of pulp is supplied to the feeder from a second pulp treatment stage in the pulping system, and a pulp discharge to discharge treated pulp from the apparatus, wherein the pulp discharge discharges the first type of pulp after treatment separately from discharging the second type of pulp after treatment, and a filtrate discharge to discharge filtrate flowing through the liquid-permeable from the apparat
    Type: Grant
    Filed: September 7, 2005
    Date of Patent: November 8, 2011
    Assignee: Andritz Oy
    Inventors: Olavi Pikka, Pekka Tervola, Hannu Rönkönharju
  • Patent number: 8048270
    Abstract: An apparatus for distributing a pulp flow, said apparatus including: a valve body connected to an inlet conduit and an outlet conduit for the pulp flow and provided with a closing member for opening and closing the valve to regulate the pulp flow; a distribution member arranged in a direction the pulp flow and downstream of the closing member, said distribution member distributing the pulp flow into at least two partial flows, and at least two channels wherein each channel receives a respective one of the two partial flows, wherein said channels are connected to the valve body or to the outlet conduit from the valve.
    Type: Grant
    Filed: April 21, 2006
    Date of Patent: November 1, 2011
    Assignee: Andritz Oy
    Inventors: Kari Peltonen, Janne Vehmaa
  • Publication number: 20110240783
    Abstract: A fixing arrangement of a chipper blade for a chipper having a cylindrical blade disc, one end surface of which is provided with one or more blades extending essentially radially in relation to the blade disc and for support thereof a wearing segment is arranged, the chipper is provided with a wearing surface subsequent the blade for resisting the stress caused by the logs being chipped in the chipper. At least one blade segment is arranged to be supported onto the blade and the wearing segment, an upper surface of which forms a desired portion of the wearing surface, and a coating is formed on the upper surface to resist stress.
    Type: Application
    Filed: December 7, 2009
    Publication date: October 6, 2011
    Applicant: ANDRITZ OY
    Inventors: Pekka Kokko, Kari Jääskeläinen
  • Publication number: 20110240243
    Abstract: An apparatus for cleaning and cooling a liquor nozzle, the nozzle including at least a liquor tube for feeding liquor and chemicals into a furnace of a recovery boiler. The apparatus includes an outer casing tube, which defines a space whereto conduits are provided for introducing water and steam to generate an emulsion or a conduit for introducing emulsion generated by the water and steam and the surface of which is provided with openings, such as pores or holes, for discharging the emulsion formed by water and steam through the outer casing.
    Type: Application
    Filed: April 6, 2011
    Publication date: October 6, 2011
    Applicant: Andritz Oy
    Inventors: Markku TANTTU, Kari Saviharju, Sirpa Du Jardin
  • Patent number: 8020594
    Abstract: The invention relates to a debarking mechanism (1) for the decortication or pretreatment of logs (2) for separately performed final debarking and for the discharge of at least some of the bark removed from a wood stream passing through the debarking mechanism, the said debarking mechanism comprising a number of rotatable debarking shafts (3, 3?) extending parallel to an advancing direction (A) of the logs (2) to be fed therethrough, which are provided with a number of teeth (4) extending beyond the circumferential surface of the shaft (3, 3?).
    Type: Grant
    Filed: April 19, 2005
    Date of Patent: September 20, 2011
    Assignee: Andritz Oy
    Inventor: Pekka Kokko
  • Patent number: 8002994
    Abstract: The present invention relates to a method of treating lime mud slurry being generated in a causticizing process in a pulp mill in a disc filter, in which method the lime mud is fed in the filter, thickened on the filter discs and removed from the filter discs. The lime mud is treated in at least two stages in one and the same disc filter in such a way that the lime mud slurry entering the filter is fed onto only a part of the filter discs, on which lime mud is thickened and removed from the discs, and the removed lime mud is re-slurried in liquid, and the lime mud slurry thus obtained is fed onto a second part of the filter discs, on which lime mud is thickened and removed from the filter and led into a subsequent process stage. The invention also relates to an apparatus.
    Type: Grant
    Filed: November 24, 2005
    Date of Patent: August 23, 2011
    Assignee: Andritz Oy
    Inventors: Holger Engdahl, Jouni Jäntti, Markku Lankinen, Antti Mattelmäki, Simo Suutari, Mika Kottila
  • Patent number: 7988820
    Abstract: An apparatus for cleaning and cooling a liquor nozzle, the nozzle including at least a liquor tube for feeding liquor and chemicals into a furnace of a recovery boiler. The apparatus includes an outer casing tube, which defines a space whereto conduits are provided for introducing water and steam to generate an emulsion or a conduit for introducing emulsion generated by the water and steam and the surface of which is provided with openings, such as pores or holes, for discharging the emulsion formed by water and steam through the outer casing.
    Type: Grant
    Filed: July 2, 2008
    Date of Patent: August 2, 2011
    Assignee: Andritz Oy
    Inventors: Markku Tanttu, Kari Saviharju, Sirpa Du Jardin
  • Patent number: 7951263
    Abstract: A method of dividing a suspension, especially a fiber suspension into an accept fraction and a fraction containing impurity particles in a centrifugal cleaning plant having at least two stages. The suspension is fed to a preceding stage, wherefrom a heavier fraction of the suspension is taken as accept fraction and a lighter fraction is taken as fraction containing impurity particles. The lighter fraction containing impurity particles is fed into a latter stage of the centrifugal cleaning plant. Before being fed to the latter stage, the feed consistency of the lighter fraction is increased.
    Type: Grant
    Filed: January 27, 2009
    Date of Patent: May 31, 2011
    Assignee: Andritz Oy
    Inventors: Marita Järvinen, Kimmo Nurminen
  • Publication number: 20110094857
    Abstract: The invention relates to an apparatus for stacking rolling material, such as e.g. wood chips, bark or grain into a pile (10) and reclaiming from the pile (10) to a material-discharging conveyor (20) located below the storing point, which apparatus comprises a center column (30) that supports a stacker boom (40) and a reclaimer boom (50), an equalizing hopper (60), at least one conveyor (25) located in the equalizing hopper (60) for transmitting the material being discharged to the discharging conveyor (20). A characteristic feature of the apparatus is that the center column (30) is supported directly through the equalizing hopper (60) onto the bottom of the equalizing hopper's (60) foundation.
    Type: Application
    Filed: June 10, 2009
    Publication date: April 28, 2011
    Applicant: ANDRITZ OY
    Inventors: Pekka Kokko, Heikki Ohvo
  • Patent number: 7931152
    Abstract: A log shuffler and conveyor assembly including: a chute including a log conveyor having a bottom surface and at least one sidewall; a gap in the log conveyor, and a log shuffler arranged in the gap of the conveyor, wherein the shuffler includes at least one pivoting plate having a first edge moving reciprocally above and below the bottom surface of the chute.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: April 26, 2011
    Assignee: Andritz Oy
    Inventors: Janne Lahteenmaki, Lennart Thornquist, Pekka Kokko, Jaakko Pitkakangas
  • Publication number: 20110088998
    Abstract: The invention relates to an apparatus for stacking rolling material, such as wood chips, bark or grain into a pile (10) and reclaiming from the pile (10) to a conveyor (20) located below the storing point, said apparatus comprising a center column (30) that supports a stacker boom (40) and a reclaimer boom (50) that are hinged to be turnable independently of each other in relation to the vertical axis of the center boom (30). A characteristic feature of the apparatus is that at least at one point that is hinged in relation to the center column (30) the supporting is arranged resting on a support wheel (60, 60?, 60?) arranged around the frame of the center column (30).
    Type: Application
    Filed: June 10, 2009
    Publication date: April 21, 2011
    Applicant: ANDRITZ OY
    Inventor: Pekka KOKKO
  • Publication number: 20110079492
    Abstract: The invention relates to an apparatus for reclaiming rolling material, such as e.g. wood chips, bark or corn from a pile (10) to a conveyor (20) below the storing point, which apparatus comprises a reclaimer boom (50) that is supported onto a center column (30), to which reclaimer boom (50) transporting means (55) are connected for transferring material being reclaimed to a conveyor (20) below the storing point. It is characteristic for the apparatus that the reclaimer boom (50) and/or the transporting means (55) are supported by means of at least one intermediate support (80) in addition to being supported at their ends.
    Type: Application
    Filed: June 10, 2009
    Publication date: April 7, 2011
    Applicant: ANDRITZ OY
    Inventor: Pekka Kokko
  • Patent number: 7831084
    Abstract: Method and system for controlling the operation of a recovery boiler or another boiler having a furnace wherein the operation is monitored by monitoring sensors, the sensors converting the acquired electromagnetic radiation to electrical signals which are conducted to image processing which forms an image of an object, such as the char bed and/or the char and/or chemicals on the furnace walls and/or deposits on boiler surfaces, based on the data from the sensors, and wherein the operation, such as burning of the char bed and/or the formation of char and/or chemicals on the furnace walls and/or the formation of deposits on boiler surfaces, is controlled with help of the image, wherein the sensors are arranged to produce sensor signals for 3D (three-dimensional) imaging, wherein the sensor signals are conducted to the image processing unit for forming a 3D image, such as an image of the bed and/or the char and/or the chemicals, and/or its shape describing derivatives, and/or temperature chart of the bed surface
    Type: Grant
    Filed: July 11, 2005
    Date of Patent: November 9, 2010
    Assignee: Andritz Oy
    Inventor: Kari Saviharju
  • Publication number: 20100243183
    Abstract: A method in connection with washing of pulp at a chemical pulp mill including at least an alkaline cooking process utilizing cooking liquor for producing pulp, brown stock treatment with essentially closed liquid cycles, in which the last washing device is a washing device based on pressing of pulp, a press or a washing press, a pulp bleaching plant using ECF-bleaching, wherein chloride-containing effluents are formed, a chemical recovery plant and effluent purification. The liquid flows generated at a chemical pulp mill are efficiently circulated without disturbing the main process and minimizing the emissions from the mill. Purified effluent in the amount of at least 1 m3/adt pulp is introduced into the dilution after the press or washing press, whereby the effluent is passed from the dilution into the first process stage of the bleaching.
    Type: Application
    Filed: June 12, 2008
    Publication date: September 30, 2010
    Applicant: ANDRITZ OY
    Inventors: Janne Vehmaa, Olavi Pikka, Pekka Tervola
  • Publication number: 20100243184
    Abstract: A method for treating liquid flows at a chemical pulp mill including at least an alkaline cooking process for producing pulp, brown stock treatment with essentially closed liquid cycles, a pulp bleaching plant using ECF-bleaching, a chemical recovery plant comprising a chemical recovery boiler, and effluent purification. Chloride-containing bleaching plant effluents are led to the effluent purification, where they are treated in order to decrease the organic matter content thereof. At least 20% of the purified effluent is returned to a pulp mill process and purified effluent is used in a last washing stage included in brown stock treatment. In the brown stock treatment the liquid flow is passed counter-currently to evaporation, wherefrom it is led for treatment to a recovery boiler process, wherein a separation process for chlorides is arranged for controlling the chloride level of the liquor cycle.
    Type: Application
    Filed: June 13, 2008
    Publication date: September 30, 2010
    Applicant: ANDRITZ OY
    Inventors: Janne Vehmaa, Olavi Pikka, Pekka Tervola