This final report summarizes the work carried out at the SCK/CEN. Mol, from 1 July 1981 until 31 December 1982 on the development of fibre metallic prefilters to be placed upstream of HEPA filters for the exhaust gases of nuclear process plants. 1. Investigations of ambient temperature Measurements of the filtration performance of Bekipor porous webs and sintered mats were performed in the AFLT (aerosol filtration at low temperature) unit with a throughput of 15 m**3/h. A parametric study on the influence of particle size, fibre diameter, number of layers and superficial velocity led to the optimum choice of the working parameters. Three selected filter types were then tested with polydisperse aerosols using a candle-type filter configuration or a flat-type filter configuration. The small-diameter candle type is not well suited for a spraying nozzles regeneration system so that only the flat-type filter was retained for high temperature tests. 2. Investigations at high temperature. A high temperature test unit (AFHT) with a throughput of 8 to 10 m**3/h at 400 degrees C was used to test the three filter types with an aerosol generated by high temperature calcination of a simulated nitric acid waste solution traced with 134-Cs. The regeneration of the filter by spray washing and the effect of the regeneration on the filter performance was studied for the three filter types. The porous mats (Type I and II) have a higher dust loading capacity than the sintered web (Type III) which means that their regeneration frequency can be kept lower.
Bibliographic Reference: EUR 8951 EN (1984) FS, 34 P., BFR 200, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989122061900 / Last updated on: 1987-01-01
Available languages: en