Design cyclones, worked example

The use of the two dimensionless groups Eu and Sffcso in cyclone scale-up and design is demonstrated in the worked examples at the end of this chapter. 

WORKED EXAMPLES WORKED EXAMPLE 9.1 - DESIGN OF A CYCLONE... 

It seems odd that there has not been before now an attempt to put together what is known empirically and theoretically about this most essential of separation devices. This book is both necessary and fascinating - a useful guide, complete with worked examples, for those attempting to design and use cyclones, and the first authoritative assembly of what is known both experimentally and theoretically for the benefit of those skilled in the art. 

Cyclones may be designed to effectively remove virtually any size particulate from a gas stream. Several worked examples of this are presented herein. The barriers to cyclone usage for small particle collection are largely those of economics. Small cyclones are routinely used for particulate as small as. 5 micron with 90% removal efficiency. Unfortunately, these small cyclones are not an attractive economical choice for many industrial applications. Conversely though, cyclones are now able to satisfy environmental and process requirements on particulate that is much finer than is commonly believed. With the advances in cyclone design that have begun in the late 20 century cyclones are commonly used for emission control and product recovery on particulates with average particle sizes below 10 microns. 

Rarely does the technical community have the opportunity to learn from the accumulated efforts of a first-rate academic author of impeccable qualifications teamed with an also-academically qualified and broadly experienced practitioner, and where both individuals are natural teachers. Such an opportunity is available in this book. Comprehensive methods are presented, coupled with real-life examples gathered from the published literature and from the authors own experiences in cyclone research and application. Those charged with responsibility for cyclone design or trouble-shooting will eagerly study and absorb this book s teachings—from theoretical basis to worked example problems. 

In this section we will present formulas required to design or evaluate a conventional cylinder-on-cone or a predominately cylindrical type of cyclone geometry. In doing so, we shall follow closely the methods of Muschelknautz (1970, for example) and, to some extent, those of Muschelknautz and Trefz (1990, 1991, 1992). Some departures from the MM will be worked into the development that follow the writers own experiences and preferences. 

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