Filtration Behavior and Dust Cake Detachment from Ceramic Filter Element

Abstract

This research work presents an experimental study of filtration behavior of dust by ceramic filler and also studies the effect of pulse gas pressure on the dust cake detachment. The experimental data are obtained using a ceramic candle filter with an area of 0.05 1 m² through which the dust—laden gas flows from the outside inwards. In the cleaning period, compressed air is injected opposite to the filtration direction. The behavior of filtration and cleaning is studied by using a velocity of 0.05 m/s, pulse gas pressure of 100, 300 and 500 kPa and pulse duration of 200 and 300 ms. The experimental results show that pressure drop of dust on the element increases quickly at the beginning because of the formation of a dense dust layer on the filler surface and then slow down due to the formation of a coarse layer. Finally, the rate of pressure drop is constant. Cleaning efficiency of captured dust cake increases with increasing pulse gas pressure and almost unchanged when pressure of pulse gas is higher than 300 kPa. Furthermore, it is found that pulse duration does not affect the cleaning efficiency of captured dust from ceramic filter surface.

Keywords : Ceramic Filter / Filtration I Cake Detachment / Hot Gas Cleaning