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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
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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