Influence of regeneration behaviour and regeneration pattern on the residual pressure drop of rigid filter media

Rigid ceramic filter media are often used to remove particles from gas stre ams at elevated temperatures. When regenerating these filter media at a cer tain pressure drop, a so-called,patchy cleaning" can be observed which infl uences the pressure drop after the regeneration step (residual pressure dro p). This contribution presents model calculations on the influence of patch y cleaning and regeneration patterns of dust cake at the filter surface on the residual pressure drop of rigid filter media. The calculations prove th at the regeneration pattern has a major influence on the residual pressure drop of a partially regenerated rigid filter medium. This can lead to a mis -interpretation of the regeneration process and the process stability, beca use the residual pressure drop can be low, although the regeneration effici ency is poor.