The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 1991
Filed:
Sep. 26, 1990
Ruedi Frey, Bassersdorf, CH;
Hans Ruegg, Wohlen, CH;
Other;
Abstract
Process and apparatus wherein nitrogen oxides NO.sub.x contained in waste gases produced by combustion of fossil fuels in a firing plant are removed by reacting the waste gases with ammonia NH.sub.3 to reduce the nitrogen oxides to elementary nitrogen N.sub.2 ; subjecting the waste gases after being so reacted to wet waste gas cleaning whereby the washing water removes the unreacted ammonia (slip) from the waste gas to produce slip enriched washing water; raising the pH value of the slip enriched washing water to a value of more than 10, introducing air into the pH raised slip enriched washing water to remove the slip from the water and produce an air-slip mixture and recycling the slip into the furnace to react with waste gases to lower the amount of ammonia discharged into the atmosphere.