Process and apparatus using two-stage boiler injection for reduction of oxides of nitrogen
CA 2022167 A1 · Owner: Noell, Inc. · Inventors: Jones, Dale Gordon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
25-, Abstract Of The Disclosure, This invention relates to methods and apparatus for reducing NOx in combustion effluent gases which comprise a two-stage injection process. NHi precursors (such as liquid-phase urea or ammonium hydroxide or the like) are, injected into the flue gas at temperatures greater than 1400°F in a first injection zone to reduce NO to nitrogen. This step is followed by injecting a peroxyl initiator such as a hydrocarbon material (for example methanol) into, the flue gas at temperatures less than 1400°F to oxidize residual NO to NO2 in a second injection zone. WPC:mlm 1825.15
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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 July 27, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 27, 2012.
- 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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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.