Patents by Inventor Barbara Lefebvre

Barbara Lefebvre 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).

  • Method for zonal injection of chemicals into a furnace convective pass to reduce pollutants from flue gases
    Patent number: 7622093
    Abstract: Zonal injection of varying compositions of chemicals, particularly an ammonia-based reagent and hydrocarbon, through injection lances arranged in a grid formation to define planar zones in a furnace convective pass of a furnace. The supply of chemicals is controlled so as to be individually determined for each discrete zone of the grid depending on conditions in that zone.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: November 24, 2009
    Assignee: Doosan Babcock Energy America LLC
    Inventors: Stuart Arrol, Peter Melling, George Anthony Yates, Michael J. Smith, Gerard J. W. C. Hesselmann, Barbara Lefebvre, John Macphail, Keith W. Morris
  • Method for Zonal Injection of Chemicals into a Furnace Convective Pass to Reduce Pollutants from Flue Gases
    Publication number: 20090047199
    Abstract: Zonal injection of varying compositions of chemicals, particularly an ammonia-based reagent and hydrocarbon, through injection lances arranged in a grid formation to define planar zones in a furnace convective pass of a furnace. The supply of chemicals is controlled so as to be individually determined for each discrete zone of the grid depending on conditions in that zone.
    Type: Application
    Filed: October 29, 2008
    Publication date: February 19, 2009
    Inventors: Stuart Arrol, Peter Melling, G.A. Yates, Michael J. Smith, Gerard J.W.C. Hesselmann, Barbara Lefebvre, John Macphail, Keith W. Morris
  • Control system for a boiler
    Publication number: 20070059226
    Abstract: A closed loop control apparatus for reducing nitrous oxide levels in combustion products created by a combustion process comprising: a reagent injection system; a controller for controlling an amount of reagent to be injected by the reagent injection system; and a first downstream measuring device adapted to provide a first output signal corresponding to a first measured parameter of the combustion products created by the combustion process, wherein the controller is adapted to control the amount of reagent to be injected in response to the value of the first output signal.
    Type: Application
    Filed: September 13, 2005
    Publication date: March 15, 2007
    Inventors: John Fogarty, Barbara Lefebvre
  • Method and apparatus for zonal injection of chemicals into a furnace convective pass to reduce pollutants from flue gases
    Publication number: 20050063887
    Abstract: Zonal injection of varying compositions of chemicals, particularly an ammonia-based reagent and hydrocarbon, through injection lances arranged in a grid formation to define planar zones in a furnace convective pass of a furnace. The supply of chemicals is controlled so as to be individually determined for each discrete zone of the grid depending on conditions in that zone.
    Type: Application
    Filed: May 21, 2004
    Publication date: March 24, 2005
    Inventors: Stuart Arrol, Peter Melling, G.A. Yates, Michael Smith, Gerard Hesselmann, Barbara Lefebvre, John Macphail, Keith Morris