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Mechanical Process Engineering Aging of cleanable dust filter media Markus Stecher Gerd Mauschitz Wilhelm Höflinger Contact: [email protected] Achema 2012 Institute of Chemical Engineering page 1 Mechanical Process Engineering Abstract Dedusting high dust concentrations with cleanable dust filter media has become the method of choice in the past decade. In order to get information about the long time filtration behavior of cleanable dust filter media, they are aged in an aging chamber. Achema 2012 Institute of Chemical Engineering page 2 Mechanical Process Engineering Animation of Aging Chamber is loading… Achema 2012 Institute of Chemical Engineering page 3 Mechanical Process Engineering Aging Chamber by Palas® Play P Reset Compressed air P Next slide ∆P Pressure tank Absolute filter Test filter medium Compressed air Filtration period: Cleaning procedure: Cake formation Pulse-jet cleaning Pressure drop rises Cake detachment Pressure drop decrease Ambient air inlet Pressure drop over test filter medium Vacuum pump Air out MFC Dust feeder 1st cycle 2nd cycle Time Dust hopper Achema 2012 Institute of Chemical Engineering page 4 Mechanical Process Engineering Parameters influencing aging procedure Test dust (different particle size distribution) Cleaning parameters d50,3=8.6µm d50,3=51.1µm 8 7 Filter face velocity Cycle time Filter medium volume-related relative particle size distribution [%] fine-grained test dust 6 coarse-grained test dust 5 4 3 2 1 0 0,1 1 10 100 1000 particle size [µm] Measured with laser diffraction analyzer „Mastersizer 2000“ (ID-Nr.: MAL 1009117) and dispersion-unit Hydro 2000 S (ID-Nr.: MAL 1009117) from Malvern Instruments. Achema 2012 Institute of Chemical Engineering page 5 Mechanical Process Engineering Results help to understand mechanisms of aging [hPa] [hPa] medium filter over test Pressuredrop drop over pressure test filter medium 40 30 20 d50,3=8.6µm Surface filtration 10 0 0 1 2 3 Residual pressure drop 4 5 Aging Value 6 Cleaning pressure drop 40 30 20 d50,3=51.1µm Depth filtration 10 0 0 Achema 2012 1 2 3 test time Test time[h] [h] 4 Aging Value Institute of Chemical Engineering Filter medium: PI needle-felt Cycle time: 100 s Tank pressure: 0.5 MPa 5 Valve opening time: 60 ms 6 Raw gas concentration: 5.5 g/m³ Filter face velocity: 2.5 m/min Test dust: fine-grained (d50,3 = 8.6µm) test dust: coarse-grained (d50,3 = 51.1µm) page 6