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Fig. 12 Precipitated particle layer. Electron microscope picture, deep cut through the layer (left,
right) and glued layer (middle)
3.3 Analysis of Particle Separation Efficiency
In the initial start phase of the precipitation system, the deposition plate electrode
(duct wall) is clean and not yet filled with particles. Therefore, the particle to be
separated from the gas stream directly impacts the wall. Depending on the particle size
and momentum, the particle impact either leads to deposition or to the resuspension
of the particles. Only a sufficiently small impact force allows the particles to be
deposited on the wall (Fig. 13).
Fig. 13 Time dependent precipitation efficiency of Al 2 O 3 and CaCO 3