Process for stripping nitrogen oxides and sulphur oxides as well as optionally other noxious elements of flue gas from combustion plants
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United States of America Patent
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Jun 2, 1987
Grant Date -
N/A
app pub date -
Sep 24, 1985
filing date -
Jan 25, 1984
priority date (Note) -
Expired
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Abstract
Process for stripping nitrogen oxides and sulphur oxides, as well as optionally other noxious elements from flue gas from combustion plants, preferably boilers of electric plants supplied with fossil fuels, the nitrogen oxides being reduced into elemental nitrogen and the sulphur oxides as well as other noxious elements being stripped by a washing process. In order to improve this process of the above-mentioned type as to the simplicity of its implementation and the possible results, the present invention proposes a series of measures such as the addition of a monobasic and/or multibasic carbonic acid to EDTA with limestone or the like, the addition of phosphonic acid or the salt thereof to the washing liquid up to an electrochemical process whereby are added to the washing liquid of a conventional desulphuration plant salts which form with the nitrogen monoxide complexes which are reduced into elementary nitrogen and water by mixing them with formic acid to prevent the precipitation of iron-III-hollow hydroxide at a potentiostatic cathode.
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