The “cleaning intensity” of a filter bag during pressure-pulse regeneration is a determining factor for both the stability of the filtration cycle and the emission level. On the other hand, the relationship between pressure pulse signal, movement of the filter media (i.e. position, velocity, acceleration), and the removal of dust from the surface and/or interstices of the filter media is not well understood.
An experiment has been designed around a coupon filter testing unit (VDI), to measure all three components of this puzzle with a high time resolution. Filter movement is measured by triangulation, dust cake removal by high-speed imaging, and the internal dust currently via the residual pressure drop.
Measurements have shown how different phases of the pressure signal correlate with different stages of media motion. As a result, a correlation has also been obtained between media deceleration, dust mass and the force threshold for cake removal. This work is currently being extended to filter media of different degrees of rigidity. In order to keep the media surface unchanged, the rigidness is changed by attaching the coupon to different types of backing.
The presentation will present the experimental set up, and discuss recent data and their consequences..
Session: G1 - Surface Filtration
Day: 11 October 2016
Time: 13:00 - 14:15 h