ANALYSIS OF OPERATIONAL FILTRATION DATA - PART III - REENTRAINMENT AND INCOMPLETE CLEANING OF DUST CAKE

Operational data for the hot-gas filtration system of the Integrated G asification and Cleanup Facility (IGCF) at the Federal Energy Technolo gy Center are carefully analyzed. A model that includes re-entrainment of filter-cake fragments Following cleaning of the candle filters, as well as incomplete removal of cake from the filters by the cleaning b ackpulses of compressed air, is developed and used to interpret the da ta. The parameters of the model are evaluated with a least-square erro r fit procedure. It is shown that inclusion of the re-entrainment mode l significantly improves the fit to the data during the short interval (similar to 50 s after each backpulse) during which re-entrainment is predicted to occur by particle-transport modeling. The re-entrainment /incomplete-cleaning model is used to evaluate the buildup of filter-c ake thickness and the filter-cake permeability. Both effects were sign ificant for the data analyzed. AEROSOL SCIENCE AND TECHNOLOGY 29: 221 - 235 (1998) (C) 1998 American Association for Aerosol Research.