12 Property Function to Compute the Dustiness of Powders
417
Fig. 3 Schematics of the redispersion dust in a double pipe-system (RDDS)
Resuspension experiments were carried out by means of a redispersion dust in
a double pipe-system (RDDS), connected to a dilution stage and a Grimm 1.108
optical aerosol spectrometer (OPC). Schematics of the RDDS are shown in Fig. 3.
The implementation of a dilution stage between sample collection and the OPC
ensures not to exceed the maximum permissible particle load of the aerosol spectrometer. Results of the resuspension experiments are shown in Figs. 4 and 5 for
three particle size fractions. In time zone B the ventilator was running and thus
resuspending the particles. In A and C the ventilator was switched off. As for Pural
NF the influence of the deposit thickness on dust formation tendency for different
particle fractions is clearly recognizable while the resuspension experiments with
Ulmer Weiß XMF where inconclusive.
Similar experiments were made with fly ash to support modeling processes of
project A1.
Fig. 4 Resuspension of Pural NF (10, 20, 30 min deposition time from left to right)
417
Fig. 3 Schematics of the redispersion dust in a double pipe-system (RDDS)
Resuspension experiments were carried out by means of a redispersion dust in
a double pipe-system (RDDS), connected to a dilution stage and a Grimm 1.108
optical aerosol spectrometer (OPC). Schematics of the RDDS are shown in Fig. 3.
The implementation of a dilution stage between sample collection and the OPC
ensures not to exceed the maximum permissible particle load of the aerosol spectrometer. Results of the resuspension experiments are shown in Figs. 4 and 5 for
three particle size fractions. In time zone B the ventilator was running and thus
resuspending the particles. In A and C the ventilator was switched off. As for Pural
NF the influence of the deposit thickness on dust formation tendency for different
particle fractions is clearly recognizable while the resuspension experiments with
Ulmer Weiß XMF where inconclusive.
Similar experiments were made with fly ash to support modeling processes of
project A1.
Fig. 4 Resuspension of Pural NF (10, 20, 30 min deposition time from left to right)