Cyclone separators performance

This completes our treatment of some of the models proposed in the literature for cyclone separation performance. Although we have not been able to derive the models in detail, we trust that we have discussed the principles on... 

In conclusion, we can say that the models based on considerations of the physical phenomena occurring within a cyclone are reasonably successful in predicting pressure drop and separation performance as a function of cyclone body length. The CFD model was found, in this case, to under-predict cyclone separation performance, while successfully reflecting the trend as a function of length. 

A Worked Example for the Prediction of Cyclone Separation Performance... 

Before leaving this section we wish to point out that the outer horn deflection mechanism described above also applies to the innermost horn segment, as one might expect. Hence, solids may also impact the inside wall of the inlet scroll or barrel, depending on the design. However, as mentioned above, these surfaces are almost always covered with erosion resistant, protective liners and, for this reason, their wear rates may not be noticeable or significant. What may be significant, however, and what may not be fully appreciated, is the effect that the particle behavior described above has on cyclone separation performance. This is another area that appears to have received virtually no attention by the research community. 

Cyclone Separator with Separate Catch Tank This type of blowdown system, shown in Fig. 26-17 and 26-18, is frequently used in chemical plants where plot pan space is hmited. The cyclone performs the vapor-liquid separation, while the catch tank accumulates the hquid from the cyclone. This arrangement allows location of the cyclone knockout drum close to the reactor so that the length of the relief device discharge hne can be minimized. The cyclone nas internals, vital to its proper operation, which will be discussed in the following sections. 

The criteria for application and performance characteristics of blowdown drums, cyclone separators, and quench tanks are discussed as follows. 

Performance of a cyclone separator is determined by flow pattern, pressure drop, and collection efficiency. 

Cyclone separators are extremely important to the successful operation of the cat cracker. Their performance can impact several factors, including the additional cost of fresh catalyst, extra turnaround maintenance costs, allowable limits on emission of the particulates, incremental energy recovery in the wet gas compressor, and hot gas expander. 

Stairmand, C. J. (1951) Trans. Inst. Chem. Eng. 29, 356. Design and performance of cyclone separators. STRAUSS, N. (1975) Industrial Gas Cleaning (Pergamon). 

Stairmand, C. J., The Design and Performance of Cyclone Separators, Trans. Instn. of Chem. Engrs., 29 356ff, London (1951)... 

The synthesis gas leaving the gasifier contains entrained particles of char and ash. Particulate removal is performed using cyclone separators and ceramic candle type hot gas filters. The coal gas is primarily comprised of H2, CO, C02, and H20. Since there is less than 0.1 mol% CH, reforming of the syngas is not necessary. However, in order to maximize hydrogen production, shift reactors will be needed to convert the carbon monoxide to hydrogen. 

FIGURE 3.4-4 Hydrocyclone separation performance for various sized cyclones. This chart is for gnideace eagineering purposes only. Final sizing of cyclones mesi be determined by tests on the expeclad slurry or prior experience in simitar situations. From R. W. Day. Chem. Eng. Prog., 69(9). 67 (1973). Reproduced by permission of the American Institute of Chemical Engineers. 

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