Influence of pleat geometry on the operating behavior of cleanable surface filters in a test-rig with pulse-jet-cleaning

The influence of pleat geometry on the operating behavior of cleanable surface filters was investigated using harmonized regeneration conditions and complementary modeling approaches. An adapted DIN ISO 11057 procedure was applied to isolate geometric effects for differently aged filter media by maintaining consistent regeneration intensity, raw gas concentration, and filter media face velocity across all geometries. The results demonstrate that under these harmonized experimental conditions pleat geometry influences the operating behavior from the first filtration cycle. The resulting differences in cycle time, residual differential pressure, and clean gas particle number concentration persist for the duration of the experiments. While aging leads to increased residual differential pressure and reduced particle emissions, similar trends across all geometries indicate comparable macroscopic aging behavior. No significant loss of effective filter media surface area was observed for the different geometries under the investigated operating conditions using a coarse, free-flowing test dust. A geometric model describing dust deposition on pleat sidewalls and in the pleat bottom suggests that the observed differential pressure development can be explained by the dust deposition inside the pleat in combination with the pleat geometry. ... mehrIn summary, the results show that increasing the pleat ratio leads to a shorter cycle time under the investigated harmonized conditions, and the geometry influence was evident from the very first cycle.