Process for the recovery of ammonia from flue gases

Details Process for the recovery of ammonia from flue gases Process for the recovery of ammonia from flue gases

1990-05-08

1995-02-07

Langel, Wayne

Chemistry of inorganic compounds

Nitrogen or compound thereof

Ammonia or ammonium hydroxide

423235, 423356, 423357, C01B 2100, C01C 100, C01C 102

Patent

active

053874072

ABSTRACT:
For reducing nitrogen oxides in the flue gases of a firing plant, fresh ammonia water, i.e. an aqueous solution of ammonia (NH.sub.3), is introduced into the flue gas flow. For achieving a high degree of separation of the nitrogen oxide a superstoichiometric addition of ammonia (NH.sub.3) is necessary. Most of the excess ammonia is washed out in the wet washer (6). A liquor, e.g. milk of lime (Ca(OH).sub.2), is dosed into the wash water in a connecting line (10) to a stripping column (11), so that a pH-value above 9.5 is obtained. The now physically dissolved ammonia (NH.sub.3) is desorbed from the wash water in the stripping column (11). The steam/ammonia mixture passing out of the stripping column (11) is condensed in a condenser (17) and the condensate in the form of ammonia water is admixed to the fresh ammonia water in feed line (3). As a function of the nitrogen oxide reduction, approximately 10 to 50% of the fresh ammonia water can be saved.

REFERENCES:
patent: 4911900 (1990-03-01), Horch et al.
patent: 5069886 (1991-12-01), Frey et al.

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