مطالعه ي سيستم پالايش و تصفيه ي آلاينده هاي گازي تاسيسات فرآوري اورانيم اصفهان

Study of Gaseous Pollutants Purification and Filtration System of Uranium Conversion Facility (UCF)

Gaseous pollutants purification and filtration system of Uranium Conversion Facility includes four Foam Scrubbers and four groups of 24 frame filters to remove dangerous gases and particles from polluted air. In this paper, the purification processes of the dangerous gases in foam towers and removal of the particles in filters are presented. The gas pollution of this facility includes dangerous chemical and radioactive compounds; as a result the high efficiency can be one of the main properties of this purification system. For achieving this goal, theoretical and experimental studies are made to select filter frame media. Our theoretical studies show that the characteristics of the best filter media are: upper thickness, high porosity and formed by fine fibers. The experimental studies to select suitable media concerning efficiency, pressure drop, chemical and mechanical resistance are done in 30 filter media. The efficiency of chosen media is determined of about 99.7% by the experiment. In addition, a semi industrial sample of foam scrubber system was designed and built. The absorption efficiency of the system for acidic gas, the same as in UCF, was measured to be about 97%. Considering these results and prevailing the standards used in UCF and also the level of air pollution in workshops, the air pollution level in the stack outlet must not surpass the authorized amount.