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:
Sep. 29, 2009
Filed:
Jun. 21, 2007
Ruedi Frey, Effretikon, CH;
Sandrine Person, Houilles, FR;
Ruedi Frey, Effretikon, CH;
Sandrine Person, Houilles, FR;
Von Roll Umwelttechnik AG, , CH;
Abstract
A process and device for purifying flue gases in refuse incineration plants during regeneration of a catalyst which serves for reducing nitrogen oxides, by, in a first step, removing acidic pollutant gases from the flue gas in a wet or dry manner, in a second step adding ammonia for reducing nitrogen oxides to the flue gas purified in the first step, in a third step feeding the flue gas admixed with the ammonia to a catalyst, where the catalyst is heated at a controlled heat-up rate for regeneration, which leads to liberation of ammonia, where the amount of ammonia added in the second step and the heat-up rate in the third step are controlled by the amount of a pollutant gas selected from the group of ammonia, and which the purified flue gas contains.