SO_2 and NO_x Removal By Microwave and Electron Beam Processing

摘要

This work presents a method and a semi-pilot scale installation (SPSI) for the simultaneous SO_2 and NO_X removal by separate and combined microwave (MW) and electron beam (EB) irradiation. The SPSI consists mainly of the following units: a gaseous mixture preparation system (GMPS), a microwave source (MS) of 2.45 GHz and 4.2 kW maximum output power, an electron beam source (EBS) of 1.8 MeV and 10.8 kW maximum output power and a multimode rectangular cavity (MRC), used as reaction chamber, in which are injected both MW and EB fields. The most important parameters for high SO_2 removal efficiencies obtained by MW technology are water and ammonia concentration, the gaseous mixture temperature during irradiation process and MW power level. The most important parameter for high NO_X removal efficiency obtained by MW technology is MW power level. The removal efficiencies obtained by MW processing were up to 95 %for SO_2 and up to 55 %for NO_r The additional use of EB irradiation to MW exposure strongly increases NO_X removal efficiencies in comparison with MW exposure only, up to 95%, simultaneously providing very high values for the SO_2 removal efficiency, near 100%.