Fluids for the A6G example simulation

This simulation uses the A6GFluid fluid from the simulation-specific Model Library as the process fluid. This is a Compositional fluid that uses the Soave-Redlich-Kwong Modified Panagiotopoulos-Reid (SRKM) method for thermodynamic calculations combined with the Rackett method for liquid densities. The SRKM method contains the necessary interaction parameters to predict the correct separation in the separators and generally yields good results for ammonia plants. For the liquid densities, the Rackett method provides better predictions for non-hydrocarbons such as nitrogen (N2) and hydrogen (H2) than the default API liquid density method.

The fluid also applies the high-pressure vapor-liquid equilibrium (VLE) adjustments to the k-value calculations to improve the robustness of the phase calculations. This better suits the high pressures present in the process.

The fluid includes the following components:

• Argon (ARGON)

• Hydrogen (H2)

• Nitrogen (N2)

• Methane (C1)

• Ammonia (NH3)