Patents Assigned to Andritz Oy
  • Patent number: 8632655
    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: Grant
    Filed: June 12, 2008
    Date of Patent: January 21, 2014
    Assignee: Andritz Oy
    Inventors: Janne Vehmaa, Olavi Pikka, Pekka Tervola
  • Patent number: 8632657
    Abstract: A method for treating liquid flows at a chemical pulp mill including at least an alkaline cooking process for producing pulp, treatment of brown stock generated in the cooking, a bleaching plant using ECF-bleaching, in which chloride-containing effluents are formed, an effluent purification plant for treating bleaching plant effluents and other effluents generated at the mill. At least a portion of the effluents is returned after the purification to the pulp production line as source of process water. More than one treatment line is arranged at the effluent purification plant for the mill effluents and effluents with different chemical compositions are purified in separate treatment lines so that the quality and amount of purified water from each treatment line is suitable for use in a stage or stages of the production process, whereto purified effluent is returned.
    Type: Grant
    Filed: June 12, 2008
    Date of Patent: January 21, 2014
    Assignee: Andritz Oy
    Inventors: Janne Vehmaa, Olavi Pikka, Pekka Tervola
  • Patent number: 8632656
    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: Grant
    Filed: June 13, 2008
    Date of Patent: January 21, 2014
    Assignee: Andritz Oy
    Inventors: Janne Vehmaa, Olavi Pikka, Pekka Tervola
  • Publication number: 20130340960
    Abstract: A method and assembly for separating contaminants from liquids, such as condensates, or vapors at an evaporation plant. The contaminants are separated from liquids by stripping when bringing a contaminant-enriched liquid into direct contact with a vapor by spraying or distributing the liquid into the vapor flowing in a vapor duct or onto wall surfaces in the vapor duct thus reducing the contaminant-content of the sprayed liquid and producing a cleaner liquid. The contaminants are enriched in the vapor. From vapors contaminants are separated by absorption when bringing a contaminant-enriched vapor into direct contact with a cleaner liquid by spraying or distributing the liquid into the vapor flowing in a vapor duct or onto wall surfaces in the vapor duct thus increasing the contaminant-content of the liquid, but producing a cleaned vapor.
    Type: Application
    Filed: October 17, 2011
    Publication date: December 26, 2013
    Applicant: ANDRITZ OY
    Inventors: Carl-Gustav Berg, Heikki Jaakkola
  • Publication number: 20130313082
    Abstract: An assembly to connect a main conveyor body to a discharge end of the conveyor including: a basic frame of the discharge end mountable to platform, and an adjusting frame of the discharge end pivotably attached to the basic frame and including a mounting bracket configured to attach the main conveyor body to the basic frame, wherein the adjusting frame pivots with respect to the mounting bracket to establish a selected set angle ? between the basic frame and the main conveyor body.
    Type: Application
    Filed: October 25, 2011
    Publication date: November 28, 2013
    Applicant: ANDRITZ OY
    Inventor: Iiro Laaksonen
  • Publication number: 20130313083
    Abstract: A cover and frame assembly for a discharge end of a belt conveyor, the assembly including: a stationary frame supporting the discharge end and including sides extending beyond the discharge end; a cover having a top, opposite side walls extending down from the top and an end face extending between the side walls and down from the top; a rim along each of the side walls, wherein each the rim seats on an upper edge of one of the sides of the stationary frame, while the cover is closed over the discharge end, and a roller on each upper edge of the sides of the stationary frame, wherein each roller extends above the upper edge and seats in a hole or pit in the rim seated on the upper edge while the cover is closed, wherein the rim of each side wall slides over the corresponding roller as the cover is opened.
    Type: Application
    Filed: October 25, 2011
    Publication date: November 28, 2013
    Applicant: Andritz Oy
    Inventors: Iiro Laaksonen, Jaakko Pitkakangas, Ari Hannimaki, Jari Sorvisto
  • Publication number: 20130199746
    Abstract: The invention relates to an apparatus for mixing a gaseous or liquid substance into fiber suspension. The apparatus includes a tubular body, which defines a space that forms a flow channel for the suspension, in which body an inlet and an outlet for the suspension are arranged so that the suspension flows through the flow channel mainly in the axial direction. Further the apparatus comprises a feed member that extends into the flow channel transversely against the flow direction of the suspension and has a cylindrical wall provided with openings for leading the substance from the feed member into the flow channel. At least one protrusion is arranged on the inner surface of the tubular body in the region the feed member. A throttling member is arranged in the flow channel downstream of the feed member in the flow direction of the suspension, and a mixing chamber is formed in the flow channel between the feed member and the throttling member.
    Type: Application
    Filed: February 4, 2011
    Publication date: August 8, 2013
    Applicant: ANDRITZ OY
    Inventors: Kari Peltonen, Arto Laukkanen, Timo Perttula, Janne Vehmaa
  • Publication number: 20130092606
    Abstract: In a screening device, a rotor element on a rotor coaxial with a cylindrical screen drum and a cylindrical screen including: an upper surface and a front face between the surface of the rotor and the upper surface, wherein the front face faces upstream into pulp flow through a gap between the screen drum and the cylindrical screen; a trailing surface extending downstream of the pulp flow from the upper surface, wherein the trailing surface tapers to the surface of the rotor and meets the surface of the rotor at a back region of the trailing surface, and opposite sidewalls extending between the trailing surface and the surface of the rotor, wherein the opposite sidewalls gradually converge towards the back region.
    Type: Application
    Filed: December 4, 2012
    Publication date: April 18, 2013
    Applicant: Andritz OY
    Inventor: Andritz OY
  • Patent number: 8387778
    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: Grant
    Filed: June 10, 2009
    Date of Patent: March 5, 2013
    Assignee: Andritz Oy
    Inventors: Pekka Kokko, Heikki Ohvo
  • Patent number: 8381899
    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: Grant
    Filed: June 10, 2009
    Date of Patent: February 26, 2013
    Assignee: Andritz Oy
    Inventors: Pekka Kokko, Heikki Ohvo
  • Patent number: 8328021
    Abstract: An apparatus for screening a fibrous suspension including: a housing, conduits therein at least for fiber suspension being fed, reject and accept, and a rotor and a cylindrical screen drum installed in the housing, at least one of which is rotatable, whereby a surface of the rotor is provided with rotor elements in proximity to the surface of the screen drum, whereby each rotor element includes a front surface facing a flow of the fiber suspension, an upper surface and a trailing surface sloping from the upper surface towards the surface of the rotor, wherein the trailing surface of the rotor element is curved and sidewalls of the trailing surface converge at a back point of the rotor element.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: December 11, 2012
    Assignee: Andritz Oy
    Inventors: Petri Harju, Sami Siik, Simo Kiero, Ville Terävä
  • Publication number: 20120290258
    Abstract: A method for measuring and aligning a rotary cylindrical or other rotationally symmetrical apparatus, such as a kiln or a drum. The apparatus to be measured and aligned has a shell and at least one supporting ring. As the rotary apparatus is rotating under process conditions, measurement points are measured on the surface of the rotating object's shell in the axial direction on both sides of each supporting ring on the same circumferential line. Regression circles are calculated from the measured points, center points are determined for the calculated circles and a straight line and its center point are determined between the center points of the circles calculated on both sides of each supporting ring. A reference straight line is calculated for the center line of the shell and the object's shell is aligned to be straight by transferring the determined center points of the shell to the calculated reference line.
    Type: Application
    Filed: November 4, 2010
    Publication date: November 15, 2012
    Applicant: Andritz OY
    Inventors: Teemu Hakkinen, Heikki Iivarinen, Pertti Kaikkonen, Tuomo Lintunen
  • Publication number: 20120279669
    Abstract: A method of treating and utilizing liquid flows at a chemical pulp mill including stages for: a) chemical pulp is produced in an alkaline cooking process, b) the brown stock generated in the cooking is treated, said treatment comprising washing of the stock and preferably oxygen delignification and subsequent washing of the stock, c) a bleaching process for the brown stock, the bleaching sequence comprising at least one stage using chlorine dioxide and additionally at least one oxidizing bleaching stage and having at least two washing stages for treating the stock with liquids and for producing filtrates, and d) filtrates from stage c) are purified at an effluent treatment plant of the chemical pulp mill, which comprises at least biological treatment, for obtaining purified effluent. The method further includes a stage e), where the purified effluent with a color of 200 mg/l (Pt color) or more and a COD value of over 150 mg/l is used as pulp treatment liquid in stage c).
    Type: Application
    Filed: November 22, 2010
    Publication date: November 8, 2012
    Applicant: ANDRITZ OY
    Inventors: Janne Vehmaa, Olavi Pikka, Pekka Tervola
  • Patent number: 8277608
    Abstract: A method of treating pulp in connection with the bleaching of chemical pulp, said method including treating of the pulp in at least an ozone, chlorine dioxide or alkali phase and thereafter washing of the pulp in a washing device having an E10 value of at least 3, whereby washing liquid is introduced into the washing device countercurrently in relation to the pulp and filtrate is discharged from the washing device. At first the pulp is washed in the washing device so that the washing liquid is filtrate obtained from the washing device itself and the amount of thus circulated washing liquid is 1.5 - 3.5 t/adt pulp, whereafter the pulp is washed with liquid introduced from outside the washing device, the amount of said liquid being such that the dilution factor in the latter wash is less than 1 t/adt and that the total amount of washing liquid used in the washing device is such that the dilution factor is more than 0 t/adt.
    Type: Grant
    Filed: June 17, 2004
    Date of Patent: October 2, 2012
    Assignee: Andritz Oy
    Inventors: Kaj Henricson, Olavi Pikka, Pekka Tervola
  • Publication number: 20120234775
    Abstract: A pressure filter for treating liquor suspensions of a cellulose pulp mill, the pressure filter including a container having tubular filtering elements suspended in a horizontal plate, through which elements filtrate flows and the interior of which communicates with a filtrate chamber located above. The filtering elements collect on their outer surface precipitate that is arranged to be periodically removed by making the filtrate in the filtrate chamber travel counter-currently through the filtration surface of the filtering elements. The filtering elements are cleaned by wash liquid passing from the filtrate chamber into the filtering elements and through their filtration surface. The interior of the filtering elements is provided with a flow distributor above the middle of a filtering element for distributing the flow from the filtrate chamber onto the filtration surface of the filtering element.
    Type: Application
    Filed: March 16, 2012
    Publication date: September 20, 2012
    Applicant: ANDRITZ OY
    Inventors: Ilkka HOLOPAINEN, Jari PAYKKONEN
  • Patent number: 8252141
    Abstract: Disclosed herein is a method for recovering a low sodium content lignin from spent kraft cooking liquor without the use a of strong mineral acid for acidulation.
    Type: Grant
    Filed: December 17, 2007
    Date of Patent: August 28, 2012
    Assignee: Andritz Oy
    Inventors: Lars Stigsson, Curt Lindstrom
  • Publication number: 20120193050
    Abstract: A method of and an apparatus for processing cellulose pulp of wood processing industry. The method and assembly may be used, on one hand, as a pressure diffuser for washing the pulp before an oxygen stage and, on the other hand, the separation of soap, gas and/or other light materials from filtrates and from black liquor of a cellulose mill in a pressurized device, as well as the new process connections enabled by the method. The method and apparatus may process filtrates from brown stock washing and bleaching as well as black liquors from a digesting department and an evaporation plant. By way of example, the filtrate of the washing department is pumped to the digesting department of a sulfate cellulose mill as well as the black liquor taken from the digesting department to an evaporation plant.
    Type: Application
    Filed: August 31, 2010
    Publication date: August 2, 2012
    Applicant: Andritz OY
    Inventor: Auvo Kettunen
  • Publication number: 20120186541
    Abstract: The present invention relates to a method and a boiler for decreasing the amount of nitrogen oxides in flue gases of a boiler, which flue gases are generated in the combustion of fuels and air. The boiler has a water circulation system comprising superheaters (8) and a furnace (1) for combustion of fuel and for generating flue gases that contain nitrogen oxides, which flue gases mainly flow upwards in the furnace and further to the superheater zone and via other heat recovery surfaces of the boiler out of the boiler, and a nitrogen oxides reducing agent is introduced into the flue gases. It is essential that the nitrogen oxides reducing agent is introduced into the flue gases prior to the superheater zone, before which the temperature of the flue gases is decreased by means of at least one heat exchanger (15) that is located in the flue gas flow upstream of the introduction of the reducing agent, for obtaining a suitable temperature window in the flue gas flow in order to reduce nitrogen oxides.
    Type: Application
    Filed: April 14, 2010
    Publication date: July 26, 2012
    Applicant: ANDRITZ OY
    Inventors: Pasi Miikkulainen, Lauri Pakarinen
  • Patent number: 8201599
    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: Grant
    Filed: September 19, 2011
    Date of Patent: June 19, 2012
    Assignee: Andritz Oy
    Inventor: Pekka Kokko
  • Patent number: 8163137
    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: April 6, 2011
    Date of Patent: April 24, 2012
    Assignee: Andritz Oy
    Inventors: Markku Tanttu, Kari Saviharju, Sirpa Du Jardin