Dust Cake Pressure Drop Determination of Surface Filters at Low Absolute Pressures

Some gas particle separation processes operate at low absolute pressure, where surface filter media are widely used. Yet filter cake pressure drop behavior at these conditions remains underexplored. To improve understanding, we determined the filter cake pressure drop as a function of absolute pressure for filter cakes formed on two different surface media at a single filter face velocity. The filter cake pressure drop decreases as absolute pressure is reduced. We adapt a semi-empirical model validated for determination of clean surface media pressure drop to filter cakes and introduce a mean empirical correction factor to reduce the experimental effort. The approach captures the trends accurately, with the simplification limited to homogeneous filter cakes.