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. 27, 1977
Filed:
Dec. 17, 1975
Shujiro Shiga, Chiba, JA;
Takeshi Katsumata, Ichihara, JA;
Yasushi Okamoto, Ichihara, JA;
Tadashi Hikasa, Ichihara, JA;
Sumitomo Chemical Company, Limited, Osaka, JA;
Abstract
A method for heat recovery in the processes of the removal of nitrogen oxides from exhaust gases containing sulfur oxides and nitrogen oxides by a catalytic or non-catalytic reduction thereof with ammonia. After passing through the reaction zone for the reduction of nitrogen oxides the down flow gases are subjected to the submitted air in a heat exchanger. The process is characterized in that the molar ratio of ammonia to sulfuric anhydride and the concentration of steam in the gases at the inlet of the heat exchanger is controlled in the range of O<NH.sub.3 /SO.sub.3 <2, preferably O<NH.sub.3 /SO.sub.3 <1.5 and more than 12% by volume, preferably more than 15% by volume, respectively, and thereby the process can continuously proceed without the production of ammonium sulfate and the deposition or adhesion thereof onto the surface of the various devices in the apparatus therefor.