Implications for the energy-evaluation of pulse-jet cleaned surface filter media regarding filter operation during typical test procedures

A prominent way to lower the required power for baghouse filter operation is the application of energy efficient filter media. Standards for filter testing of cleanable filter media (e.g. DIN ISO 11057) set a framework under which the differential pressure behavior of filter samples can be characterized – however there is no reference value to evaluate the application of filter media during operation of the test procedure based on energy demand. Höflinger and Laminger proposed a suitable evaluation in the past where fan power and the energy demand for jet-pulse cleaning have to be considered. This publication further discusses the proposed energy evaluation within testing standards that set a framework consisting of ∆p-controlled filter regeneration during the measurement stage of a filter test. Different filter medium samples were investigated (spunbond, needle-felt and membrane). The impact of cycle time on the power for filter operation within ∆p-controlled regeneration strategies was investigated by inter-and extrapolation of the differential pressure behavior. For low cycle times, the power required for filter regeneration dominates the total power. For longer cycle times and thicker dust-cakes, the contribution of the fan power to the total power increases while the power required for filter regeneration decreases and stable levels for the total power are reached yielding robust comparative values for different filter media. Furthermore, data from a single filter test can be extrapolated to identify suitable cycle times and estimate the potential of the filter medium considering operation at lower power and further mitigation potential for particle emissions. • Evaluation of cleanable surface filter media based on energy efficient operation. • Simple implementation in existing test procedures (e.g. DIN ISO 11057). • Stable comparative benchmark value for suitably long cycle times. • High relevance of power for filter regeneration / cleaning frequency. • Extrapolation for a wide range of cycle times from a single filter test.