In the past we investigated the upper part of a cyclone around the inlet and the vortex finder. At present the dust outlet geometry (apex) is the subject of our current research.
This research is operated along two lines. In the first line we perform experimental investigations with the cyclone test facility in the institute’s laboratory under different operating conditions (e.g. very low and high dust loadings, volume flows up to 1000m³/h) with different dust outlet geometries. We measure the overall separation efficiency and the pressure drop across the cyclone. With Laser Doppler Anemometry (LDA) and Phase Doppler Anemometry (PDA) it is possible to determine velocity and particle distributions at different places in the cyclone. The measurement results of different dust outlet geometries help us to understand the separation process in the lower part of the cyclone.
In the second line we calculate the flow pattern and the particle movement in the cyclone using computational fluid dynamics (CFD). The results of the simulations agree well with LDA- data. At present, we model the two-phase-flow in the cyclone by an Euler-Lagrange-method. In these simulations we investigate the effects of particle lift forces, particle-particle-collisions, wall roughness and agglomeration on the total separation efficiency and the grade efficiency curve.
Some results of the research project (e.g. downcomer tube) are being successfully applied in industry.
not assigned KP: Institut für Verfahrens- und Kerntechnik