Abstract
When a high energy beam of electrons is directed into flue gas, abundant quantities of radicals and free atoms are generated. The radicals and atoms containing oxygen react with SO2 and NOx to form acids. These acids can be removed by reaction with an alkali to form solid salts. These reactions are enhanced by high humidity, low temperature flue gas. A lime slurry spray dryer can be used in order to achieve these gas conditions and to supply the required alkali. In this method, shown in Fig. 1, the flue gas first passes through a spray dryer, where the gas is cooled and humidified by means of slurry evaporation, and hydrated lime in the form of fine particulate is entrained by the gas. Approximately one-half of the SO2 reacts with the calcium hydroxide in the spray dryer to form calcium sulfite. The gas is subsequently irradiated by an electron beam which results in the conversion of SO2 and NOx to sulfuric and nitric acid. The gas finally passes through a fabric filter in which the acids react with calcium hydroxide to produce calcium sulfate and nitrate. These products, as well as entrained fly ash, are removed by the fabric filter.
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