Process for reduction of oxides of nitrogen
US4405587A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1982 |
| Grant date | Sep 20, 1983 |
| Priority date | — |
| Expiry date | Feb 16, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23G5/16
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.