Patent ID: 7829033
Filing Date: 2010-11-09
Classification: B01D

Abstract:
1. An apparatus for reducing the concentration of nitrogen oxides in a stream of combustion gases, comprising: a particle separating device to remove particulates from at least a portion of the combustion gases in advance of a NO conduit means for transporting a side stream of gases comprised of outside air and/or combustion gases and comprising less than 3% of the volume of the total combustion gases at a temperature of at least 300° C.; means including nozzles to produce droplets of under 500 microns of an aqueous solution of urea NO heating means for maintenance of a temperature of greater than 300° C. to assure substantially all of the urea in said droplets is converted into a gas in from 1 to 10 seconds, leaving no significant dissolved or free solids or liquid to contact with and foul a NO means including an ammonia injection grid for introducing said side stream of gases containing the gases resulting from the gasification of the urea NO