초록 ▼

An improved process for reducing the concentration of oxides of nitrogen (NOx) in a waste stream is provided wherein an effluent stream containing oxides of nitrogen (NOx) is burned at a temperature greater than about 2000°F. and less than about 3000°F. with an effective amount of an oxygen containi

An improved process for reducing the concentration of oxides of nitrogen (NOx) in a waste stream is provided wherein an effluent stream containing oxides of nitrogen (NOx) is burned at a temperature greater than about 2000°F. and less than about 3000°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°F. to about 1800°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 (NOx) 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.

대표청구항 ▼

A process for reducing the concentration of oxides of nitrogen in a stream comprising: burning the stream containing oxides of nitrogen at a temperature greater than about 2000°F. in the presence of a stoichiometric excess of an amount of a reducing agent required for stoichiometric reduction of ava

A process for reducing the concentration of oxides of nitrogen in a stream comprising: burning the stream containing oxides of nitrogen at a temperature greater than about 2000°F. in the presence of a stoichiometric excess of an amount of a reducing agent required for stoichiometric reduction of available oxygen to provide a combustion effluent substantially free of oxides of nitrogen; and reacting the combustion effluent with a gaseous stream having an effective amount of oxygen to achieve flameless oxidation of the combustibles present in the combustion effluent at a temperature of about 1600°F. to about 1800°F. to produce an oxidation effluent substantially free of oxides of nitrogen.