Aspen HYSYS Petroleum Refining FCC Model

Riser reactor Crack feed species to product species Plug-flow reactor (PFR) operating under pseudo-steady conditions 

Stripper Remove of adsorbed hydrocarbons on the catalyst Continuously stirred-tank reactor (CSTR) with well-mixed model 

Regenerator Combust coke present on the catalyst Stoichiometric or partial combustion of coke 

Feed vaporizer Vaporize the feed species for input into the riser model Heater with associated two-phase flash 

Valves Control the flow and pressure drop from the riser/reactor section to regenerator section Typical valve Eqs. based on pressure drop across the valve 

---

Aspen HYSYS Petroleum Refining FCC Model 159 Table 4.3 Required submodels for a basic simulation of a complete FCC unit. 

Aspen HYSYS Petroleum Refining FCC Model 163 Table 4.5 Summary of 21-lump kinetics (adapted from [6]). 

Calibrating the Aspen HYSYS Petroleum Refining FCC Model... 

The Aspen HY SYS Petroleum Refining FCC model relies on a series of submodels that can simulate an entire operating unit while satisfying the riser and regenerator heat balance. Note that the configuration is similar to the minimum submodels listed in Table 4.3 of the previous section. We summarize Aspen HYSYS Petroleum Refining submodels in Table 4.4 and highlight some key features in subsequent sections. 

Aspen HYSYS Petroleum Refining includes a method to convert limited feed information (distillation curve, density, viscosity, refractive index, etc.) into kinetic lumps for use in the unit-level FCC model. In this section, we present an alternative method based on data and methods available in the public literature. We extend the work by Bollas et al. [52] to infer the kinetic lump composition from limited process data. This method uses techniques to normalize the distillation curve, cut the distillation curve into boiling-point lumps, and infer the composition of the each of these boiling-point lumps. We have developed all of these techniques into spreadsheets using Microsoft Excel. These spreadsheets are available in the DVD accompanying this text... 

Workshop 4.1 Cu/de for Modeling FCC Units in Aspen HYSYS Petroleum Refining 195 Table 4.19 DELTA-BASE vectors generated using rigorous modei. 

In this secdon, we go through an example of how to organize data, build and calibrate a model for a fluid catalytic cracking (FCC) unit using Aspen HYSYS Petroleum Refining. We discuss some key issues in model development and how to estimate missing data required by Aspen HYSYS Petroleum Refining. We divide this section into four workshops ... 

The initial flowsheet presents a blank interface where we can place different objects from the Object palette shown in Figure 4.48. The initial tool palette only shows typical unit operations anddoesnot show the advanced Aspen HYSYS Petroleum Refining objects. We will use both toolbars to build the complete FCC model. We can bring up the advanced palette by pressing F6. 

---