Enel-ente Nazionale Per L'energia Elettrica

Luigi Civitano

Alessandro Baroni

Omero Sguerri

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).

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Pisa, Italy

Luigi Civitano