Patents by Inventor Nils Gustav Lindman

Nils Gustav Lindman 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).

  • Process for obtaining flue gases with low content of NO.sub.x while combusting black liquor and a recovery boiler therefor
    Patent number: 6155210
    Abstract: The invention relates to a method of firing black liquor in recovery boilers where the intention is to get fumes having a low content of nitrogen oxides (NO.sub.x). The invention is characterized in that a part of the combustion air is added as a last portion at a level on a very high level so that a reducing atmosphere will exist in a very great part of the boiler and during a long period of time of at least 3-5 seconds. The invention also includes a recovery boiler for carrying out the above said method.
    Type: Grant
    Filed: July 19, 1999
    Date of Patent: December 5, 2000
    Assignee: Kvaerner Pulping AB
    Inventor: Nils Gustav Lindman
  • Process for obtaining flue gases with low content of NO.sub.x in a black liquor recovery boiler
    Patent number: 6071377
    Abstract: The invention relates to a process for combusting black liquor in recovery boilers where the intention is to obtain flue gases which have a low content of nitrogen oxides (NO.sub.x). The invention is characterized in that ammonia is supplied to a part of the combustion air, which part is then supplied to the recovery boiler, as the final portion, at a high level, so that a reducing atmosphere is created in a very large part of the recovery boiler and for a long time, of at least 2.5-5 seconds or more. The invention also includes a recovery boiler for implementing the above mentioned process.
    Type: Grant
    Filed: June 4, 1998
    Date of Patent: June 6, 2000
    Assignee: Kvaerner Pulping AB
    Inventor: Nils Gustav Lindman