Patents by Inventor Lotta Lindgren

Lotta Lindgren 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 reducing the emission of NO.sub.x in a combustion process
    Patent number: 5407649
    Abstract: The invention provides a method for reducing the emission of NO.sub.x in a pressurized fluidized bed combustion process comprising (a) combusting reaction products in the presence of a sulfur absorbent in a pressurized fluidized bed at a pressure of at least 5 bar to form a flue gas comprising dust particles and an initial concentration of NO.sub.x, (b) reacting the NO.sub.x in the flue gas with a substance which reduces NO.sub.x in a first reaction zone to form a flue gas which has a lower NO.sub.x concentration as compared to its initial NO.sub.x concentration, wherein the absolute pressure of the flue gas is at least 5 bar and the temperature of the flue gas is at least 450.degree. C. in the first reaction zone, and (c) reducing the NO.sub.x concentration in the flue gas provided by step (b) in a second reaction zone by contacting the gas with a solid surface comprised of flue gas dust particles.
    Type: Grant
    Filed: July 15, 1992
    Date of Patent: April 18, 1995
    Assignee: ABB Carbon AB
    Inventors: Mats Andersson, Hans-Jorgen Damsgaard, Ingemar Greis, Lotta Lindgren, Olle Nystrom, Sven Ohlsson, Henrik Wallman