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:
Nov. 24, 1992
Filed:
Jul. 31, 1991
Steven J Bortz, Laguna Niguel, CA (US);
John W Podlenski, Orange, CA (US);
Research Cottrell, Inc., Branchburg, NJ (US);
Abstract
A method and apparatus for reducing nitrogen dioxide (NO.sub.2) emissions in a dry sodium scrubbing process without significantly reducing sulfur dioxide (SO.sub.2) and nitrogen oxides (NO.sub.x) removal efficiencies. A sodium additive is injected into a flue gas duct carrying flue gas from a combustor to a particulate collection device to remove sulfur dioxide and nitrogen oxides from the flue gas. The flue gas is humidified by introducing water into the flue gas duct at a point upstream of the sodium additive introduction point. Through control of the moisture content of the flue gas and the temperature in the particulate collection device, the amount of NO.sub.2 emissions is reduced to a value below that which causes the creation of a brown plume emanating from the gas stack.