Patents by Inventor Janne Vehmaa

Janne Vehmaa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • RECOVERY PROCESS AND SYSTEM FOR A PULP MILL
    Publication number: 20080289782
    Abstract: A method for burning chlorine-containing liquors in a chemical recovery boiler at a pulp mill, wherein the recovery boiler includes spent liquor sprayers for feeding spent liquor and a number of combustion air levels including: increasing a combustion temperature in the recovery boiler in a burning zone where a chlorine-containing liquor or a chlorine-containing effluent is burned; while burning the liquor or effluent, volatilizing the chlorine in the liquor or effluent to produce chloride-containing salts in flue gases in the boiler, and removing the chloride-containing salts from the flue gases.
    Type: Application
    Filed: April 23, 2008
    Publication date: November 27, 2008
    Applicant: ANDRITZ OY
    Inventors: Kari Saviharju, Heikki Jaakkola, Janne Vehmaa
  • Method and apparatus for treating pulp
    Patent number: 6733625
    Abstract: The present invention relates to a method of treating chemical pulp in order to optimize the consumption of bleaching chemicals and to improve the quality of the pulp. Especially the invention relates to a method according to which filtrate obtained from a suitable stage of the washing of brown stock preferably cooked by an alkaline cooking method is treated with an oxidizing chemical prior to the oxygen stage following the brown stock washing.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: May 11, 2004
    Assignee: Andritz Oy
    Inventors: Kaj Henricson, Eero Kontturi, Olavi Pikka, Janne Vehmaa
  • Method and apparatus for separating soap
    Patent number: 6582601
    Abstract: A method and apparatus for separating soap from liquor in a filtrate tank are particularly well suited for treating soap-containing filtrates from digester houses, bleach plants, and washer rooms in the chemical pulp processing industry. A device is disposed in the filtrate tank for generating a horizontal draw between the soap collecting devices and the soap.
    Type: Grant
    Filed: January 18, 2000
    Date of Patent: June 24, 2003
    Assignee: Andritz Oy
    Inventors: Pasi Heinämäki, Hannu Rönkönharju, Janne Vehmaa, Olavi Pikka
  • Method and apparatus for treating pulp
    Publication number: 20020088571
    Abstract: The present invention relates to a method of and apparatus for treating pulp. More precisely, the present invention relates to a method and apparatus for treating pulp with oxygen. Especially preferably the method and apparatus according to the invention relate to oxygen delignification of chemical pulp, i.e. so-called oxygen bleaching.
    Type: Application
    Filed: May 21, 2001
    Publication date: July 11, 2002
    Inventors: Pekka Tervola, Janne Vehmaa
  • Method and apparatus for treating pulp
    Publication number: 20020088567
    Abstract: The present invention relates to a method of treating chemical pulp in order to optimize the consumption of bleaching chemicals and to improve the quality of the pulp. Especially the invention relates to a method according to which filtrate obtained from a suitable stage of the washing of brown stock preferably cooked by an alkaline cooking method is treated with an oxidizing chemical prior to the oxygen stage following the brown stock washing.
    Type: Application
    Filed: May 15, 2001
    Publication date: July 11, 2002
    Inventors: Kaj Henricson, Eero Kontturi, Olavi Pikka, Janne Vehmaa