Investigation on the removal of SO3 in ammonia-based WFGD system

摘要: Abstract The SO3 removal properties were investigated in the wet flue gas desulfurization (WFGD) system. relationship of aerosol emission and concentration was explored experimentally based on ammonia impacts operating parameters, such as liquid-to-gas ratio (L/G), temperature, superficial velocity, particle efficiency studied. results showed that when increased, higher although sizes became smaller within measurement range electrical low pressure impactor (ELPI). When 12 mg/Nm3 47 mg/Nm3, respectively, aerosols emitted from WFGD system similar morphologies. Under same conditions, efficiencies ammonia-based than those limestone–gypsum system, both which rose with increase concentrations. In WFGD, would be improved L/G raised temperature velocity reduced. Two mechanisms proposed processes. One collision trap mechanism other heterogeneous reaction mechanism. sulfuric acid formed though quenching process hot measured to mainly submicron particles. For these particles, Brownian diffusion proved predominant processes, rather inertial impaction.