Process for reduction of oxides of nitrogen

Details Process for reduction of oxides of nitrogen Process for reduction of oxides of nitrogen

1982-02-16

1983-09-20

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

423210, 423212, 431 4, 431 10, C01B 2100, B01D 4700

Patent

active

044055870

ABSTRACT:
An improved process for reducing the concentration of oxides of nitrogen (NO.sub.x) in a waste stream is provided wherein an effluent stream containing oxides of nitrogen (NO.sub.x) is burned at a temperature greater than about 2000.degree. F. and less than about 3000.degree. F. with an effective amount of an oxygen containing gas and a stoichiometric excess of a hydrocarbon, based on the total amount of available oxygen, to provide a combustion effluent. The combustion effluent is thereafter contacted, at a temperature in the range of from about 1600.degree. F. to about 1800.degree. F., with an effective amount of a gaseous stream containing less than 21 volume percent oxygen to substantially oxidize all combustibles present in the combustion effluent and provide an oxidation effluent substantially free of oxides or nitrogen (NO.sub.x) and combustibles. The oxidation efluent may be cooled in heat exchange equipment to recover energy, recycled to support the combustion and/or the oxidation of the combustibles, or vented to the atmosphere.

REFERENCES:
patent: 3860384 (1975-01-01), Vulliet et al.
patent: 3873671 (1975-03-01), Reed et al.
patent: 3911083 (1975-10-01), Reed et al.
patent: 4144313 (1979-03-01), Germerdonk
patent: 4244325 (1981-01-01), Hart et al.

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