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US 2012/0237422 A1Published application
Method and plant for flue gas de-noxing
AssigneeLinde Aktiengesellschaft
InventorsFlorian WINKLER, Nicole Schodel
Life of this patent
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Abstract
The invention relates to a method for depleting nitrogen oxides from an oxygen-containing gas stream. The gas stream is brought into contact with a scrubbing solution containing ammonia and ammonium sulphite in a NO2 reduction, whereby NO2 is reduced to N2. NO is reacted with ammonia and oxygen to form ammonium nitrite in an NO elimination step which proceeds at elevated pressure. Likewise, the invention also relates a plant for operating the method according to the invention.
Claims21
A method for depleting nitrogen oxides from an oxygen-containing gas stream, said method comprising:
- bringing the gas stream is into contact with a scrubbing solution containing ammonia and ammonium sulphite in a NO2 reduction, wherein NO2 present in the gas stream is reduced to N2, and
- reacting nitrogen monoxide present in the gas stream with ammonia and oxygen to form ammonium nitrite in an NO elimination,
- wherein the reaction of the nitrogen monoxide in the NO elimination proceeds at a pressure of at least 2 bar.
Dependencies are inferred from the claim text.