Thorsten Reuther + Hardy Hofmann

Hofmann CERAMIC GmbH

Metal - Filtration

Re - Imagined

a) Sieving effect

b) Filtercake

c) Deep bed filtration

Fig.1 Mechanisms of cermamic filters

3 step filtration

Figure 2a : Slag layer – foam ceramic filter.

Figure 2b : Slag layer – extruded filter.

Diagram 1 : Relation filtersurface / filtration effect

Filtration effect

Filter surface

50%-ige- Reduzierung des

Filtrationseffektes??

Bild 2 Dickenreduzierung bei Schaumkeramikfilter Reduction of thickness (foam filter)

Fig. 3a : “Blocked Filter”. View from below.

Figure 3b : “Blocked Filter”. Side view.

Figure 4 : Open areas of a pressed and extruded filter.

Filter type DimensionCell- /

holesizeOpen Area

% of

open

Area

Cellfilter, 50csi100 x

75mm

2,95 x

2,95mm5056mm² 67%

Round hole filter100 x

75mmØ 2,17mm 3142mm² 42%

Cellfilter, 50csi100 x

100mm

2,95 x

2,95mm6752mm² 67%

Round hole filter100 x

100mmØ 2,81mm 4165mm² 42%

Comparison of the geometries of extruded filters (cellfilters)

and pressed round hole filters

Table 1

Filter type DimensionCell- /

holesizeOpen Area

% of

open

Area

Cellfilter, 50csi100 x

75mm

2,95 x

2,95mm5056mm² 67%

Round hole filter100 x

75mmØ 3,30mm 3650mm² 49%

Cellfilter, 50csi100 x

100mm

2,95 x

2,95mm6752mm² 67%

Round hole filter100 x

100mmØ 3,50mm 5164mm² 52%

Comparison of the geometries of extruded filters (cellfilters)

with the new designed pressed round hole filters

Table 2

Figure 5 : Strainer core Ø 230x30mm.

Diagram 1 : Relation filtersurface / filtration effect

Filtration effect

Filter surface

Figure 6 : Flow in front and after a filter.

Figure 7 : Scheme of the function of a strainer core.

Inclusions

Tailback

Figure 8 : Flow in front and after a filter.

Figure 9: Flow simulation with water.

Figure 10: Inclusions in front of the filters.

Figure 11 :“ Clean” filterstructure.

Figure 12 : Impurities in front of a pressed round hole filter.

Pressed filter

Impurities

Figure 13 : Impurities in front of the filters and on top of the pouring basin.

Figure 14 : Impurities in front of filters.

Figure 15 : Impurities in front of the filter.

Diagram 2 : Ratio of volumetric flow and flow resistance to the filtering capacity.

Volumetric flow

Flow resistance

Filtration effect /

Efficiency

2

1

Optimal

area

For additional information, please contact:

Hardy Hofmann

Mühlweg 14, 35767 Breitscheid, Gemany

+49 (0) 2777/9145-0

+49 (0) 2777/9145-55

info@hofmann-ceramic.de

www.hofmann-ceramic.de

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Thank you for

your attention!