Process mode for the CC28 example simulation

The objective of Process mode is to provide an overall mass and energy balance for the process and to estimate the product flowrates and compositions. We switch the following process specifications to meet the design requirements:

• For each heat exchanger, we switch the duty and utility flowrate specifications with the outlet stream temperature (Tto or Tso) or vapor fraction (VFto or VFso) specifications. This allows us to calculate the required utility flowrates.

• We calculate the CO2 recovery(R[CO2]) in the PSA units to specify the composition of H2 in the H2 Sink (H2.z[H2]). This allows us to meet product specifications.

• We calculate the flowrate from the natural gas Source (NatGas.W) to specify the flowrate of the natural gas fed to the SMR process (S44.F). This allows us to specify the amount of natural gas that we want to send to the SMR reactor.

• We calculate the flowrate of the air Source (Air.W) to specify the excess oxygen in the B1 burner (B1.xO2). This allows us to completely combust the natural gas fed to the burner.

• We calculate the duty of HX6 (HX6.Duty) to specify the composition of water in the vapor that we send to the PSA unit (V1Out.z[H2O]). This allows us to separate most of the water from the hydrocarbons as liquid water that we then reuse in the process.

• We calculate all the outlet ratios of the steam header (STMHDR.OutRatio) to specify the steam-to-carbon ratio (SC_Ratio).