Abstract 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.
A METHOD TO DENINISH NO* IN BURNING GASES COMPRISING THE STEPS OF: BURNING A FUEL WITH A SUBSTANTIALLY STOICHIOMERIC AMOUNT OF COMBUSTION SUPPORTING GAS OR AIR IN A FIRST REFRACTORY LINED CHAMBER. INTRODUCING GASES CONTAINING SAID NOX INTO SAID FIRST CHAMBER, INTRODUCING A MIXTURE OF HYDROCARBON GAS AND STREAM INTO SAID FIRST CHAMBER TO PROVIDE THEREIN A REDUCING ATMOSPHERE, PASSING THE RESULTING GAS EFFLUENT AT TEMPERATURES ABOVE 2000*F INTO A SECOND REFRACTORY LINED CHAMBER RAPIDLY COOLING AND MAINTAINING SAID RESULTING EFFLUENT TO A TEMPERATURE WITHIN THE RANGE OF 1250* TO 2000*F, AND INTRODUCING AIR INTO SAID SECOND CHAMBER TO BURN EXCESS COMBUSTIBLES.
Claim 2
Independent Claim
102 words
A METHOD TO DENINISH NO* IN BURNING GASES COMPRISING THE STEPS OF: BURNING A FUEL WITH A SUBSTANTIALLY STOICHIOMERIC AMOUNT OF COMBUSTION SUPPORTING GAS OR AIR IN A FIRST REFRACTORY LINED CHAMBER. INTRODUCING GASES CONTAINING SAID NOX INTO SAID FIRST CHAMBER, INTRODUCING A MIXTURE OF HYDROCARBON GAS AND STREAM INTO SAID FIRST CHAMBER TO PROVIDE THEREIN A REDUCING ATMOSPHERE, PASSING THE RESULTING GAS EFFLUENT AT TEMPERATURES ABOVE 2000*F INTO A SECOND REFRACTORY LINED CHAMBER RAPIDLY COOLING AND MAINTAINING SAID RESULTING EFFLUENT TO A TEMPERATURE WITHIN THE RANGE OF 1250* TO 2000*F, AND INTRODUCING AIR INTO SAID SECOND CHAMBER TO BURN EXCESS COMBUSTIBLES.
Claim 3
Dependent Claim
27 words
The method as in claim 1 in which said first gases comprise a mixture of hydrocarbon gas and steam which are reformed into H2, CO and CO2.
Claim 4
Dependent Claim
24 words
The method as in claim 1 in which said first gases comprise at least one gas from the group of H2, CO and CH4.