The riser operating modes are vital to design a CFB for a required process.
Different operating modes provide different solid residence times and mixing behaviour, which define both the efficiency/ yield of the reactions and the heat transfer.
Literature gives evidence of distinct operating modes as a result of observed differences both in slip factors, and in the range of particle velocities and their associated residence time distribution, resulting in the definition of 4 distinct solids hold-up regimes in the riser, as depicted in Fig. 2, with the different operating modes (dilute, dense, coreeannulus, combined) being a function of U and G in the riser.
The riser operating modes are vital to design a CFB for a required process. Different operating modes provide different solid residence times and mixing behaviour, which define both the efficiency/ yield of the reactions and the heat transfer. Literature gives evidence of distinct operating modes as a result of observed differences both in slip factors, and in the range of particle velocities and their associated residence time distribution, resulting in the definition of 4 distinct solids hold-up regimes in the riser, as depicted in Fig. 2, with the different operating modes (dilute, dense, coreeannulus, combined) being a function of U and G in the riser.
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