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    Wednesday, July 23, 2008   ProMax » Interface » Multiple Flowsheets     Search  

ProMax effectively combines the technology of TSWEET and PROSIM. Because of this union, all of a facility's independent processes may be modeled in a single project. You have the flexibility to choose the best property package for each process while passing data between flowsheets.

Multiple flowsheets in a single ProMax project might be required to model a process. If multiple flowsheets are included in a project, material and/or energy can be transferred from one flowsheet to another using a Cross Flowsheet Connector (see Cross Flowsheet Connector for further information).

  • Directly link independent process flowsheets.
  • Simplify the simulation by process specific flowsheets.
  • Increase accuracy with the best property package per flowsheet.

Some examples of situations where multiple flowsheet projects are either required or advantageous follow:

Processes Using Different Property Packages - Each flowsheet is assigned an Environment which specifies the property package and components. If several processes requiring different property packages are to be modeled in the same project, multiple flowsheets with different Environments are required. For example, both sweetening and dehydration systems of a gas processing facility are to be modeled. The amine unit must be simulated using an Environment with an Electrolytic Property Package specified (e.g. Electrolytic ELR), whereas the associated dehydration unit must be simulated using an Environment with an Equation of State Property Package (e.g. SRK). A separate flowsheet for each unit is required.

Processes Using Different Components - Chemical components are also specific to each Environment. Thus simulations with significantly different components (e.g. gas processing system vs. R22/R13 refrigeration loop) may be placed on separate flowsheets so that each process can be associated with an Environment containing the appropriate components. In the case of a refrigeration loop, energy rather than material is transferred between flowsheets. This application of multiple flowsheets is optional since the refrigeration loop can be modeled on the same flowsheet as the main process. However, if a heating system containing heat transfer fluids is modeled, the heating system must be on a separate flowsheet since a different property package must be used.

Complex Processes - A complex process containing a large number of blocks and streams can be split into sections each represented by a different flowsheet or "Page" in Visio for easier viewing. This is possible since material and energy are allowed to cross the flowsheet boundary.