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Cyclone separators inlet loading

Both the models of Smolik and Zenz predict cyclone separation efficiency as a function of loading purely from knowledge of the efficiency at low loading and the loading itself. Physical and operational factors, such as cyclone geometry and size, solids size distribution and density, inlet velocity and other operating conditions, are not included in these models, and the effect of these parameters is thus not thought to be of primary importance. In the Muschelknautz model, on the other hand, the inlet velocity, the cyclone dimensions, and the mean size and density of the inlet solids all feature. [Pg.187]

The liquid-solid hydrocyclone, shown schematically in Fig. 3.4-3, functions like a gas-solid cyclone. The hydrocyclone is also known as a hydroclone. The primary independent parameters that influence the ability of a hydrocyclone to make a separation are size and geometry of the hydrocyclone, particle size and geometry, solids loading, inlet velocity, split between overflow and underflow, density differential, and liquid viscosity. A reasonable estimate of Ae particle cut diameter (50% in underflow and overflow) d o) is given by the following dimensionless relationship, developed initially by Bradley ... [Pg.161]

Muschelknautz et al. (1996) also proposed a mechanistic model of cyclone operation. In this model, the gas can carry only a maximum amount of solids (called the critical loading). At any solids loading in excess of this critical loading, the solids are immediately separated from the gas at the inlet to the cyclone, as indicated in Fig. 5. The solids remaining in the gas are then separated in the cyclone barrel and in the inner vortex below the gas outlet tube as if the cyclone were operating at a lower solids loading. [Pg.606]

Separate single stainless-steel modules allow individual optimisations for the specific conveying tasks. A successful conveying may, for example just depend on the detail design of the suction module which could have a radial or tangential inlet (Figure 17.11). Tangential inlet is applied for extremely fine powders such as toner or soot and keeps the filter surface load low. The collection of the material in the lower half of the conveyor is improved if in addition a further cyclone cone is inserted. [Pg.322]

In this section we will compute the grade-efficiency curve and overall separation efficiency at low inlet solids (classification only) loadings (co < Cql)- The grade-efficiency curve for a given cyclone expresses the functional dependence of separation performance upon particle diameter. As discussed in Chap. 3, it is normally an s-shaped function satisfying the limits ... [Pg.120]

In addition to the normal feed particle size distribution that enters the cyclone, Muschelknautz and co-workers (Muschelknautz and Trefz, 1990,1991 Trefz, 1992) have modified their earlier cyclone model (or models) to include an inner feed or inner feed particle size distribution . The concept here is that, if the inlet solids loading exceeds the limit loading , some portion of the incoming feed solids will quickly separate out but those that don t will have a somewhat finer particle size than that feeding the cyclone. It is this... [Pg.123]

Cyclone designers have long known that the separation efficiency of tangential inlet cyclones improves with increasing solids loading. Even so, the exact mechanism for this improvement is still not established beyond doubt, in spite of many investigations of the topic. [Pg.183]

We will be returning briefly to the topic of solids loading in swirl tube separators later. Here, we wish to note that a difference exists between the behavior of cyclones with tangential inlets and swirl tubes equipped with inlet vane assemblies, so that the results shown in these figures cannot be applied to swirl tubes. [Pg.184]


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