Patents by Inventor Lawrence E. McDonald

Lawrence E. McDonald 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).

  • In-situ regeneration of a catalyst masked by calcium sulfate
    Patent number: 8048818
    Abstract: An in-situ method for regenerating a deactivated catalyst removes a calcium sulfate layer masking active catalyst sites. A reducing agent converts the calcium sulfate to calcium oxide, which is then removed, by reintrainment into the flue gas steam using soot blowers or sonic horns. The method is particularly useful for regenerating selective catalytic reduction (SCR) catalysts used to remove nitrogen oxides from flue gas produced by combustion of coal from the Powder River Basin. The method can be practiced using existing SCR system hardware, and without removing the SCR system from service.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: November 1, 2011
    Assignee: Babcock & Wilcox Power Generation Group, Inc.
    Inventors: S. Behrooz Ghorishi, Stanley J. Vecci, Lawrence E. McDonald, Donald P. Tonn
  • IN-SITU REGENERATION OF A CATALYST MASKED BY CALCIUM SULFATE
    Publication number: 20090247392
    Abstract: An in-situ method for regenerating a deactivated catalyst removes a calcium sulfate layer masking active catalyst sites. A reducing agent converts the calcium sulfate to calcium oxide, which is then removed, by reintrainment into the flue gas steam using soot blowers or sonic horns. The method is particularly useful for regenerating selective catalytic reduction (SCR) catalysts used to remove nitrogen oxides from flue gas produced by combustion of coal from the Powder River Basin. The method can be practiced using existing SCR system hardware, and without removing the SCR system from service.
    Type: Application
    Filed: March 26, 2008
    Publication date: October 1, 2009
    Inventors: S. Behrooz Ghorishi, Stanley J. Vecci, Lawrence E. McDonald, Donald P. Tonn