Uniflow cyclones - Dedusting at restricted spaces

M. Kraxner*, T. Kofler, M. Pillei, MCI - The Entrepreneurial University, Austria

The commonly known principle of cyclone separators is as simple as wide its application field. Cyclones are characterized by a simple construction, the robust mode of operation and therefore often used in process industry. Some applications get into conflict with the voluminous housing, which is necessary due to its working principle. To close this gap the little cousin of the standard reverse flow cyclone was invented, the so called uniflow or axial-flow cyclone. The name of this cyclone type is derived of the flow field pattern inside this dedusting system. The gasflow enters and leaves the cyclone in the same direction and offers many applications for this very compact and simple design.

Compared to a standard reverse flow cyclone, uniflow cyclones can be built approximately two-third smaller at nearby same efficiencies. Up to now, the missing universally valid design criteria characterize the bottleneck of a wide application and integration of uniflow cyclones within process industry. The existing literature mainly focuses on special applications as shown in the research work of Gauthier et al. (1990) or Zhang et al. (1999). The high turbulent fluid flow pattern offers a complex parameter system which brings the description by dimensionless characterizations to limitations. Pointing out one part of a uniflow cyclone - the design of the swirl generator - which offers many possible geometric variances that influence the flow field and the efficiency strongly, recommend an empirical way of investigation.

The construction of uniflow cyclones could be separated into four major parts, which are responsible for a successful particle separation. The swirl vane inlet (SVI) is the first part in flow direction and bares numerous design parameters. The number of vanes, the vane angle, the core diameter and the overlap of the vanes represent a bundle of parameters which interact with each other. Due to the fact, that nearby 50% of the pressure drop occurs during the generation of the swirl, there has been shed light onto the design of the swirl vane inlet. CFD-Simulations, which where validated by non-invasive PIV-measurements, show an optimal...

Session: G11 - Short Oral + Poster Presentations
Day: 12 October 2016
Time: 14:45 - 16:45 h

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