Thermodynamic optimization of fluidized catalytic cracking (FCC) units

In this paper, a thermodynamic optimization procedure for FCC riser units has been developed. The formulation uses a 2D fluid flow and kinetic model to provide the necessary information for the optimization process. The thermodynamic analysis is based on the unit entropy generation minimization, i.e...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2011-02, Vol.54 (5-6), p.1187-1197
Main Authors: Souza, J.A., Vargas, J.V.C., Ordonez, J.C., Martignoni, W.P., von Meien, O.F.
Format: Article
Language:English
Subjects:
Applied sciences
Catalysts
Computational chemistry
Crude oil, natural gas and petroleum products
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Exergetic analysis
Exergy
Face centered cubic lattice
Fluidization
Fuels
Mathematical model
Mathematical models
Minimization
Optimization
Petroleum
Power plants
Processing of crude oil and oils from shales and tar sands. Processes. Equipment. Refinery and treatment units
Reactor analysis
Theoretical studies. Data and constants. Metering
Thermodynamics
Thermodynamics, mechanics etc. For energy applications
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Summary:In this paper, a thermodynamic optimization procedure for FCC riser units has been developed. The formulation uses a 2D fluid flow and kinetic model to provide the necessary information for the optimization process. The thermodynamic analysis is based on the unit entropy generation minimization, i.e., the minimization of the destroyed exergy in the system. This kind of analysis has been widely used in power generation plants, with large benefits. It was verified that for any given catalyst mass flow rate, there exists an optimum value for the catalyst to oil mass flow rate ratio, COR, for maximum mass flow rate production of gasoline, or any other desired product. Next, the objective function (net exergy production rate) was maximized through the minimization of the destroyed exergy inside the FCC unit. The optimization was conducted with respect to the catalyst to oil ratio (COR). It is important to stress that all optima are sharp, i.e., for example with H/D=50, the variation of E∼net is greater than 50%, calculated from (E∼net,max-E∼net,min)/E∼net,max for 5
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2010.10.034