Abstract
Irradiation with electron beams was proposed as an effective method for removing nitrogen oxides (NOx) and sulfur dioxide (SO2) in flue gases from industrial plants such as power stations and steel plants. In this process, electron-beam irradiation causes conversions of NOx and SO2 to aerosols which can be collected by electrostatic precipitators or by bag filters. From the results obtained by basic studies (Tokunaga and Suzuki 1984; Matzing and Paur 1992) and pilot-plant tests which have been done in Japan (Kawamura et al. 1980), Germany (Fuchs et al. 1988), the USA (Frank et al. 1988), etc., the process is considered to be a simultaneous and effective NOx/SO2 removal method without production of waste water to be treated. Three pilot plant tests are now being conducted for electron-beam treatment of flue gas in Japan: (1) for removal of NOx and SO2 from flue gas from a cod-burning power plant (Namba et al. 1992), (2) for removal of NOx, SO2 and HCl from flue gas from a municipal waste incinerator (Doi et al. 1992), and (3) for removal of NOx from exhaust gas of a car-tunnel. A pilot plant is now under operation in Poland for removal of NOx and SO2 from flue gas from coal-burning boiler (Chmielewski et al. 1992).
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