Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1992-06-22
1994-07-19
Heller, Gregory A.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
42324306, 423396, 423545, 20415746, C01B 2100, C01B 1700, C01C 118, C01C 124
Patent
active
053307330
ABSTRACT:
A combustion gas is cooled a first time to about 110.degree. C. in a first cooling chamber (3), up to 90% of the ashes is removed in a first precipitator (9) then the gas is cooled again in a second cooling chamber (10), to about 80.degree. C.; in a reaction chamber (13), by energization by means of electrons the sulphur dioxide and nitrogen oxides are converted into sulphuric acid and nitric acid and, with the addition of dry ammonia (15) the two said acids are converted to salts of ammonia, the latter are retained in a second precipitator (21) and sent to a chimney; characteristics of the method and the plant are that, from the instant of the injection of the ammonia into the reaction chamber (13), the temperature of the gas is maintained at above 80.degree. C. to reduce the thermochemical conversion of the sulphur dioxide to acidic sulphites and sulphates and that in a subsequent injection chamber (16) hydrogen peroxide is injected into the gas to convert the residual sulphur dioxide into sulphuric acid which, reacting with the ammonia, produces ammonia salts (FIG. 1).
REFERENCES:
patent: 4004995 (1977-01-01), Machi et al.
patent: 4454100 (1984-06-01), Faatz
patent: 4562053 (1985-12-01), Andersson
patent: 4585631 (1986-04-01), Pfeiffer
patent: 4995955 (1991-02-01), Kim et al.
patent: 5041271 (1991-08-01), Aoki et al.
Baroni Alessandro
Civitano Luigi
Sguerri Omero
Enel-Ente Nazionale per l'Energia Elettrica
Heller Gregory A.
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