SimuSage
SimuSage is a set of Delphi components for process simulation (flowsheeting) tasks based on the thermochemical equilibrium application ChemApp. It is a set of Rapid Application Development tools that can be integrated into any simulation. The components support the properties of inheritance, encapsulation and polymorphism.
SimuSage fully supports the concepts of streams, phases, phase constituents, and system components. SimuSage allows the user to define stream types and materials based on a FACTSage data-file.
ChemApp is based on the local equilibrium concept that uses input streams of defined composition, temperature and pressure to obtain an equilibrium state for which either temperature and pressure or appropriate extensive property balances, e.g. for the enthalpy (heat) are given. From the equilibrium output streams are generated which can be used in further process steps.
The basic ChemApp concept
The use of SimuSage is only limited by the availability of thermochemical data. Since ChemApp has a library for non-ideal solutions in the field of inorganic materials, SimuSage is also geared towards application to processes involving in-organic substances. A limited number of organic species (mainly gases and liquids) is however available in the databases.
The following sequence of figures shows how SimuSage is applied to a process in which a fluidised bed reactor with a hot gas cyclone is used for the pyrolysis of sewage sludge.
Figure 2.1 - The process scheme showing the flow of matter through the process stages.
Figure 2.2 The process model showing the use of the various unit operations as a basis for the calculational procedure.
Figure 2.3 The results showing the distribution of various heavy metals in the fly ash and the cyclone ash.
Further fields in which SimuSage has already been applied successfully are process metallurgy, cement making, combustion processes and several others.
Before the actual building of the model with the SimuSage tool can start it is good practice to develop a conceptual scheme of the process using the unit operations available in SimuSage. These are streams, stream splitters, mixers (no chemical reactions !), equilibrium reactors, iterators. Built your entire model using the unit operations in basic configurations such as by-passes or split equilibria (to include kinetic inhibitions into your process), or use recycle streams with (or without) internal equilibrium in order to handle output from one stage as input to a previous stage.
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