Hydrodynamics of Riser Units and Their Impact on FCC Operation
| Autor: | David Nevicato, Céline Derouin, Gabriel Wild, Michel Forissier, Jean-Rene Bernard |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Industrial & Engineering Chemistry Research. 36:4504-4515 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie970432r |
| Popis: | The hydrodynamic characteristics of the riser of a FCC plant are investigated in a cold pilot plant. The results are checked and completed with measurements made in real operating FCC units. In both cases, tracing of the gas, sampling probes, and γ-tomography were used. The gas and solid velocity profiles are described by using a plug-flow model with radial dispersion. The gas velocity profile is formally represented by an Ostwald−de Waele type equation. The axial solid concentration profile is fitted to data obtained in a commercial FCC unit. The radial dispersion coefficient of the gas is directly measured in the plant. The kinetics of the reactions occurring during catalytic cracking are investigated in a microreactor and are represented by a 19-lump model including deactivation by coking of the catalyst. A combination of this reaction model with the hydrodynamic model is able to predict with a good precision the yields of the different product families obtained in an industrial FCC unit. It is checked... |
| Databáze: | OpenAIRE |
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