Wet Electrostatic Precipitator: installation, commissioning and optimization of a dust and ammonia abatement system

The aim of this thesis “Wet Electrostatic Precipitator: installation, commissioning and optimization of a dust and ammonia abatement system” is to describe and analyse the expected performance of an air emission treatment unit on the prilling tower, installed at the YARA site in Ravenna (RA), and any process optimisation. In particular, the main purpose is to reduce the emissions of dust and ammonia from the prilling tower into the atmosphere by introducing a modification to the existing NAS (Stamicarbon Ammonium Nitrate) plant. The modification pertains to the installation of a Wet ElectroStatic Precipitator (WESP), consisting of two absorption trays at the bottom to capture ammonia and an electrostatic wet precipitator at the top to capture the remaining dust and droplets. This is to comply with the new limits <10 mg/Nm3 (dust) and <10 mg/Nm3 (ammonia), to decrease the current emission limits of dust of 35 mg/Nm3 and ammonia of 10 mg/Nm3, as indicated in the prescriptions of D.M.181 of 11/05/2022 (AIA).