If you find droplets after high efficiency filters like these, there are 2 most common causes :
1. Gas by-pass. This can be a gasket seal problem, a draintube / hydraulic seal problem, or fibre bed failure. Depending on the extent of the by-pass you may or may not notice a lower than normal pressure loss.
2. Re-entrainment. Acid droplets can be torn off the exit surface of the filter as the liquid drains down by gravity. For this to happen, i.e. for the surface tension of the liquid to be broken, either the gas velocity or the inlet liquid load must be significantly higher than normal design values, or a combination of both being higher. So higher plant gas flow rates or solids blockage of the filters or seriously uneven gas distribution can explain higher velocities in the fibre bed ; process duty changes such as temperature of gas or acid, or mechanical factors such as distributor problems can explain increased inlet liquid loads.
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