Apparatus for NO{HD x {b control using steam-hydrocarbon injection

摘要

This invention describes a furnace system for the reduction of nitrogen oxide containing gases which utilizes a two-chambered refractory lined furnace. Fuel gas and stoichiometric air is introduced into the first chamber to provide an ambient temperature sufficient for the reaction of steam and hydrocarbon gases which are introduced into the first chamber to provide a reducing atmosphere. The nitrogen oxide (NOx) containing gases are also introduced into the first chamber where the NOx is reduced. The gases then pass into the second chamber where they are rapidly cooled to a temperature below that at which there is thermo-regeneration of nitrogen oxides. Additional air is supplied to the second chamber for the combustion of combustible gases remaining therein after reduction, care being taken that the temperature never rises above the temperature at which there is substantial regeneration of nitrogen oxides.