KINETICS OF SO2 REMOVAL FROM FLUE-GAS BY ELECTRON-BEAM TECHNIQUE

Laboratory scale experiments were carried out in order to get more information about the oxidation of SO2 by OH radicals (homogeneous reaction) and the oxidation Of SO2 at aerosol surfaces (heterogeneous reaction). For the experiment of homogeneous reaction, SO2 was added to synthetic flue gas without initial NO and without ammonia and the mixture was irradiated with electron beam. The SO2 removal was measured as a function of temperature and water vapour concentration at constant dose. For the experiment of heterogeneous reaction, SO2 was added to nucleating sulfuric acid aerosol. No SO2 removal was observed in this case. So, it can be concluded that the heterogeneous oxidation Of SO2 is negligible in the absence of ammonia. Therefore, the oxidation Of SO2 MUSt be interpreted merely by homogeneous gas phase chemistry. The gas phase kinetics are derived from comparison of experimental results and computer modelling.