Patents by Inventor Heikki Siirilä

Heikki Siirilä 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).

  • Patent number: 7044996
    Abstract: The present invention relates to method, which helps to reduce and remove the build-up forming on the grate of a fluidized-bed furnace in the roasting of fine-grained material such as concentrate. The concentrate is fed into the roaster from the wall of the furnace, and oxygen-containing gas is fed via gas nozzles under the grate in the bottom of the furnace in order to fluidize the concentrate and oxidize it during fluidization. Below the concentrate feed point, or feed grate, the oxygen content of the gas to be fed is raised compared with the oxygen content of the gas fed elsewhere.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: May 16, 2006
    Assignee: Outokumpu Technology Oy
    Inventors: Pekka Taskinen, Maija-Leena Metsärinta, Juha Järvi, Jens Nyberg, Heikki Siirilä
  • Patent number: 6814571
    Abstract: The present invention relates to an arrangement and method that help to reduce the build-up formed on the grate of a fluidized-bed furnace in the roasting of fine-grained material such as concentrate. The concentrate is fed into the roaster furnace from the wall of the furnace, and oxygen-containing gas is fed via gas jets under the grate in the bottom of the furnace in order to fluidize the concentrate and oxidize it during fluidization. Below the concentrate feed point, or feed grate, the oxygen content of the gas to be fed is raised compared with gas fed elsewhere using additional gas jets situated in the feed grate higher than the other jets. The extra jets of the feed grate are connected to their own gas distribution unit.
    Type: Grant
    Filed: September 9, 2003
    Date of Patent: November 9, 2004
    Assignee: Outokumpu Oyj
    Inventors: Jens Nyberg, Heikki Siirilä, Juha Järvi
  • Patent number: 6641392
    Abstract: The invention relates to a method of regulating a roasting furnace in fluidized bed roasting. Part of the roasting furnace grate is separated off into a separate grate section, known as the overflow grate, where the nozzles and the amount of roasting gas blown through them can be regulated independently of the main grate. It is advantageous to position the separately regulated grate in the section of the furnace where the overflow aperture is located.
    Type: Grant
    Filed: August 27, 2002
    Date of Patent: November 4, 2003
    Assignee: Outokumpu Oyj
    Inventor: Heikki Siirilä