2002 Volume 51 Issue 8 Pages 285-295
Experiments of flue gas treatment by electron beam were carried out, using simulated ligniteburning flue gas containing SO2 (5500 ppm), NO (390 ppm) and H2O (22%) . Removal efficiency of SO2 was more than 90% at a dose of 1-2 kGy. It shows applicability of electron beam for treatment of lignite-burning flue gas. Another removal reaction besides the radiation-induced radical reaction and the thermal reaction occurring without irradiation was suggested by the facts that removal of SO2 by the radical reaction is only a few hundreds of ppm and the removal amounts by thermal reaction under irradiation is lower than a half of total desulfurization. The mechanism similar to thermal reaction was proposed, assuming simultaneous uptake reaction of SO2 and NH3 on the surface of liquid aerosol It was suggested that ammonium nitrate having deliquescence relative humidity (DRH) of 60% at 25°C plays an important role in producing liquid aerosols. Decrease of DRH of ammonium nitrate with elevating temperature and with formation of double salt of ammonium sulfate results in enhancement of formation of liquid aerosols.
