Mechanical Process Engineering Aging of cleanable dust filter

Mechanical Process Engineering Aging of cleanable dust filter media Markus Stecher Gerd Mauschitz Wilhelm Höflinger Contact: markus. stecher@tuwien. ac. at 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® Reset P Next slide ∆P Compressed air Re Absolute filter set Pressure tank or N Test filter medium Vacuum pump Ambient air inlet Air out MFC Dust feeder Achema 2012 Compressed air Filtration period: Cleaning procedure: §Cake formation §Pulse-jet cleaning §Pressure drop rises §Cake detachment ex ts lid Pressure drop over test filter medium Play P e §Pressure drop decrease 1 st cycle 2 nd cycle Time Dust hopper Institute of Chemical Engineering page 4

Mechanical Process Engineering Parameters influencing aging procedure Test dust (different particle size distribution) d 50, 3=8. 6µm d 50, 3=51. 1µm Cleaning parameters Filter face velocity Cycle time Filter medium 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 Pressure drop over test filter medium [h. Pa] Results help to understand mechanisms of aging Co m clo plete gg ing d 50, 3=8. 6µm Surface filtration Residual pressure drop Co m clo plete gg ing d 50, 3=51. 1µm Depth filtration Test time [h] Achema 2012 Aging Value Cleaning pressure drop Aging Value Institute of Chemical Engineering Filter medium: PI needle-felt Cycle time: 100 s Tank pressure: 0. 5 MPa Valve opening time: 60 ms Raw gas concentration: 5. 5 g/m³ Filter face velocity: 2. 5 m/min Test dust: fine-grained (d 50, 3 = 8. 6µm) test dust: coarse-grained (d 50, 3 = 51. 1µm) page 6