Evaluation of operating conditions during the pulse jet cleaning filtration using different surface treated fibrous filters

This work was performed in order to evaluate the operating conditions during the pulse jet cleaning filtration using different surface treated fibrous filters. The experiments were realized using a small flat media. The comparative studies were performed with untreated and treated (singeing/calendering and calendering/thermofixation with an eggshell type anti-pilling finish (smooth surface) on one side) polyester filters to remove micrometric particles of dolomitic limestone. Filtration tests were conducted with a superficial velocity of 4 cm/s. The stipulated maximum pressure drop was 100 Pa, the pulse time was 200 ms and pressure pulse (Pp) of 2 kgf/cm2. The filters showed satisfactory performance during fifty cycles. The untreated filter presented better cleaning efficiency and lower residual pressure drop, resulting in better regeneration of the filter during fifty cycles. However, the collection efficiency of the untreated filter was lower, compared to the surface-treated filters. The findings indicate that it is important to use surface treatment of filters in order to avoid deep deposition of particles and achieve high collection efficiencies during prolonged filtration cycles.