Patents Assigned to Andritz Oy
  • Patent number: 9541286
    Abstract: In a boiler, a space is reserved to expand the boiler by increasing the front and rear walls. To expand the boiler, wall additions are added to increase the width of the front and rear walls. After the expansion, the distance between the front and rear walls is substantially the same distance between the front and rear walls before the expansion.
    Type: Grant
    Filed: October 18, 2005
    Date of Patent: January 10, 2017
    Assignee: Andritz Oy
    Inventors: Jan Storbacka, Petri Tikka
  • Patent number: 9469491
    Abstract: A rotary feeder for transferring loose material, said rotary feeder having a housing, where a rotor transfers material from the feed channel of the housing into the discharge channel of the housing, the rotor having blades for transferring the material, and a counter blade is fixed in the housing of the rotary feeder between the blades of the rotor for cutting oversized pieces of material. A filler is arranged in the feed channel of the rotary feeder, to prevent the formation of a protrusion in the feed channel that would disturb the flow of the material formed by the counter blade, the edge of the filler adjacent to the counter blade being arranged to yield, and the filler is arranged to return to its initial position after the cutting operation.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: October 18, 2016
    Assignee: Andritz Oy
    Inventors: Markku Kaljunen, Pekka Kokko
  • Patent number: 9310075
    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: Grant
    Filed: April 14, 2010
    Date of Patent: April 12, 2016
    Assignee: Andritz Oy
    Inventors: Pasi Mikkulainen, Lauri Pakarinen
  • Patent number: 9259674
    Abstract: Method and apparatus for reducing the thickness of a precoat-layer accumulated on the filtering surface of a filter disc from a solids-containing suspension in a basin of a disc filter, said disc filter having two or more filter discs arranged on a shaft and between them at least one drop chute provided with a scraper on both sides, which scraper scrapes the cake filtered from the suspension on the filtering surfaces of the filter discs into the drop, the layer thickness of the precoat on the filtering surface is reduced by shortening the distance between the tips of the scrapers and the filtering surface, and the precoat thickness reduction is accomplished for the precoats on the filtering surface of the two filter discs on both sides of the drop chute non-simultaneously.
    Type: Grant
    Filed: February 5, 2013
    Date of Patent: February 16, 2016
    Assignee: Andritz Oy
    Inventors: Tommi Hammarberg, Matti Mantsinen, Simo Suutari, Petri Tarjavuori
  • Patent number: 9234737
    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: Grant
    Filed: November 4, 2010
    Date of Patent: January 12, 2016
    Assignee: Andritz Oy
    Inventors: Teemu Hakkinen, Heikki Iivarinen, Pertti Kaikkonen, Tuomo Lintunen
  • Publication number: 20150377677
    Abstract: The invention concerns an optical remote sensing system, comprising a reaction chamber adapted to host a chemical reaction in the shape of a scattering turbid atmosphere inside the reaction chamber. An optical active sensor is used to detect the three dimensional structure of an accumulation, such as a heap, inside the reaction chamber, suggesting various measurement methods.
    Type: Application
    Filed: February 20, 2014
    Publication date: December 31, 2015
    Applicant: ANDRITZ OY
  • Patent number: 9163358
    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: Grant
    Filed: August 31, 2010
    Date of Patent: October 20, 2015
    Assignee: Andritz OY
    Inventor: Auvo Kettunen
  • Patent number: 9096382
    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: Grant
    Filed: October 25, 2011
    Date of Patent: August 4, 2015
    Assignee: Andritz OY
    Inventors: Iiro Laaksonen, Jaakko Pitkakangas, Ari Hannimaki, Jari Sorvisto
  • Patent number: 9080286
    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: Grant
    Filed: August 20, 2008
    Date of Patent: July 14, 2015
    Assignee: Andritz OY
    Inventors: Esko Mattelmäki, Kari Saviharju
  • Publication number: 20150184339
    Abstract: A recovery boiler plant of a chemical pulp mill including: a boiler including a lower region with an outlet to discharge smelt; a dissolving tank proximate to the outlet and configured to receive smelt; a smelt spout coupled to the outlet and including a chute extending from the outlet to a position at or over an inlet to the dissolving tank; and a shielding room including walls, a ceiling and a floor, wherein one of the walls includes a wall of the boiler, and the shielding room encloses a volume adjacent the boiler and above the dissolving tank, wherein the enclosed volume includes and the smelt spout and a working area in front of the smelt spout.
    Type: Application
    Filed: May 16, 2013
    Publication date: July 2, 2015
    Applicant: ANDRITZ OY
    Inventors: Ari Heinola, Veli Riikonen
  • Patent number: 8992729
    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: Grant
    Filed: October 17, 2011
    Date of Patent: March 31, 2015
    Assignee: Andritz Oy
    Inventors: Carl-Gustav Berg, Heikki Jaakkola
  • Patent number: 8950584
    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: Grant
    Filed: December 4, 2012
    Date of Patent: February 10, 2015
    Assignee: Andritz Oy
    Inventors: Petri Harju, Sami Siik, Simo Kiero, Ville Terava
  • Publication number: 20140319052
    Abstract: A closing valve unit for a centrifugal cleaner arrangement including first and second connecting members configured to connect a cyclone to a centrifugal cleaner group, and a movable valve sandwiched between the first and second connecting members, the moveable valve including apertures commensurate with openings to feed and reject conduits of the cyclone and to openings to feed and reject conduits of the cyclone cleaner group, wherein the movable valve has a first position in which the apertures are aligned with the cyclone and cleaner group feed conduits and with the cyclone accept and cleaner group accept conduits, and a control element connected to the moveable valve and configured to move the moveable valve between the first position and the second positions.
    Type: Application
    Filed: September 6, 2012
    Publication date: October 30, 2014
    Applicant: Andritz OY
    Inventors: Jarmo Immonen, Marito Jarvinen, Simo Suortti
  • Publication number: 20140166794
    Abstract: A bottom grate for a crusher for chipping or comminuting material which includes: support ribs each substantially perpendicular to the rotational axis of the crusher; grate blades mounted to the support ribs and substantially parallel to the rotational axis, wherein the grate blades are releasably mounted to the support ribs and the grate blades each have a cutting edge proximate to a cutting or crushing rotor in the crusher; pulling members extending between two of the support members, wherein the pulling members are in tension and the tension in the pulling members binds the blades in the support members.
    Type: Application
    Filed: May 4, 2012
    Publication date: June 19, 2014
    Applicant: ANDRITZ OY
    Inventors: Markku Kaljunen, Pekka Kokko
  • Patent number: 8721840
    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: Grant
    Filed: February 4, 2011
    Date of Patent: May 13, 2014
    Assignee: Andritz Oy
    Inventors: Kari Peltonen, Arto Laukkanen, Timo Perttula, Janne Vehmaa
  • Patent number: 8707911
    Abstract: A cooling system for air ports and other ports in furnace walls includes a cooling medium pumping system and ports provided with a cooling medium piping or channels inside the metallic port material. The liquid flow generated by the cooling medium system cools the ports. The ports are constructed of a casting material, and the ports are provided with a cooling liquid flow, which passes in a piping or pipings or channels inside the casting material of the ports.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: April 29, 2014
    Assignee: Andritz Oy
    Inventors: Kari Saviharju, Jorma Simonen, Lasse Koivisto, Markku Tanttu
  • Patent number: 8703079
    Abstract: A method for feeding lime mud into a lime kiln including a rotary kiln shell having an interior between a first end wall and a second end wall, the method including: feeding the lime mud into a flue gas flow in the interior of the rotary kiln shell or in close proximity to the shell to pretreat the lime mud; separating the pretreated lime mud from the flue gas flow; conveying the separated lime mud into the lime kiln, and calcining the separated lime mud in the lime kiln.
    Type: Grant
    Filed: December 7, 2009
    Date of Patent: April 22, 2014
    Assignee: Andritz Oy
    Inventor: John Mahlon Leichliter, III
  • Publication number: 20140102648
    Abstract: A method to pulp cellulosic fibrous material including: alkaline cooking cellulosic fibrous material in a continuous digester vessel to produce a pulp having a kappa number in a range of 50 to 120; washing the pulp discharged from the digester vessel; treating the washed pulp in the presence of oxygen and alkali to remove lignin; washing the oxygen-treated pulp such that the kappa number is recued by at least at least 30; separating lignin from wash filtrate generated by the washing of the oxygen-treated pulp, and using the separated wash filtrate as a washing liquid in the washing of the pulp from the digester vessel.
    Type: Application
    Filed: March 21, 2012
    Publication date: April 17, 2014
    Applicant: Andritz OY
    Inventors: Janne Vehmaa, Johan Engstrom, Jussi Piira
  • Publication number: 20140044621
    Abstract: The present invention relates to a method and an arrangement for burning lime mud into lime in a lime kiln The lime mud flows counter-currently to flue gases from a feed end to a firing end and the fuel used is flue gas that is produced by gasifying a fuel in the presence of combustion air in a gasifier. The combustion air for gasification is preheated with heat generated in lime mud combustion. The arrangement is provided with a conduit between the lime kiln and the gasifier for leading air from the lime kiln into the gasifier as combustion air. At least a portion of the combustion air for gasification is preheated with heat generated in the lime mud combustion so that air is led into cooling of lime obtained in the combustion and further into the kiln, from or through the firing end of which air is taken into the gasification.
    Type: Application
    Filed: February 23, 2012
    Publication date: February 13, 2014
    Applicant: Andritz OY
    Inventor: Juhani Vehmaan-Kreula
  • Patent number: 8640634
    Abstract: An arrangement is disclosed for supplying an air jet form to the furnace of a recovery boiler, where the furnace has a front wall, a rear wall and side walls. Black liquor spraying devices are disposed on the furnace walls on one or several levels of the furnace. A plurality of air ports are located at several horizontal elevations for introducing air into the furnace from an air supply. In the arrangement for the secondary air flows, at least two horizontal air levels at different elevations are arranged above the lower primary levels and below the black liquor sprayer. Secondary air is supplied from two opposite walls. The secondary air ports on each of said first and second horizontal elevations comprise air ports for each horizontal elevation that project a pattern of large air jets into the furnace from said opposite walls and said secondary air ports further comprise a plurality of secondary air ports on at least one of the elevations that project smaller air jets into the furnace.
    Type: Grant
    Filed: October 14, 2005
    Date of Patent: February 4, 2014
    Assignee: Andritz Oy
    Inventors: Kari Saviharju, Jorma Simonen, Raimo Paju, Jukka Savolainen, Esa Vihavainen