Method of firing black liquor in recovery boilers and a recovery boiler for firing black liquor
CA 2106310 C · Owner: Kvaerner Pulping Aktiebolag · Inventors: Olausson, Lars
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a method for firing black liquor in a recovery boiler for obtaining fumes having a low content of nitrogen oxides, the method comprising the step of introducing a portion of combustion air into the boiler at a distance above a black liquor inlet so as to provide a reducing atmosphere with a residence time of at least about three seconds between the black liquor inlet and the introduction of the portion of combustion air wherein the, reducing atmosphere is generated without extra addition of reduction gases.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed March 4, 1992 and granted August 20, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 4, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 4, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.