Aspen FCC Overview

Aspen FCC (AFCC) is an open-equation, flowsheet-based model designed for both online and offline applications. The model is constructed from individual blocks that represent the separate pieces of equipment—riser, standpipe, slide valve, cyclone, transfer line, etc.—found in commercial FCC units. Each building block is generic and can be configured with dimensions corresponding to a given commercial unit (Table 5). 

Catalyst slide-valve two-phase flow model 

In the riser model, detailed hydraulics and heat effects are eaptured by linking flow equations to kineties. The riser model can be eonfigured vertieally, horizontally, or at any angle of inclination. Multiple risers ean be used. The individual risers can process different feeds or the same feed. In essenee, any commercial riser/reactor configuration can be simulated with the modular components of AFCC. 

Hydrocarbon feed and regenerated eatalyst models are eonnected to the inlet of the Riser model. The catalyst-stream model ineludes the mass flow, temperature, pressure, enthalpy of the eatalyst/coke mixture, particle density of the catalyst/eoke mixture, coke-on-eatalyst weight fraetion and eoke eomposition. 

Pressure drop ealculations are based on head, aceeleration, and frietional effects. Pressure drop through the riser is modeled as a combination of 

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