A recovery boiler where the flue gas is divided into two streams and a method therefore
CA 2173369 C · Owner: Ahlstrom Machinery Oy · Inventors: Raak, Keijo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a method of treating waste liquor from pulping processes for recovering energy and chemicals from the waste liquor. The purpose is to increase the capacity of the recovery boiler. According to the invention waste liquor is combusted in a recovery boiler (10) for producing molten salts and flue gases and flue gases are divided into at least two streams. One of the streams is passed to the heat exchange surfaces (14 16, 18) subsequent to the furnace (12) of the recovery boiler and is discharged from the boiler. The other of the gas streams or other gas streams is/are withdrawn from the recovery boiler at (38) or at points which are above the waste liquor …
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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 August 10, 1995 and granted October 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 10, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 10, 2017.
- 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.