Summary for the U7 example simulation

Refinery steam systems require steam balances.

The objective of this simulation is to:

• Create an initial steam balance for a typical refinery steam system that contains steam at three different pressure levels:

  • High pressure (HP)

  • Middle pressure (MP)

  • Low pressure (LP)

• Demonstrate how to model the deaerator and close the condensate and boiler feedwater loop.

• Create sequence logic that sets the priority of letdown valves, steam turbines, and turbine extraction valves to meet a wider range of process steam demand.

• Create alternative cases where the steam sequence logic automatically changes the letdown valve and steam turbine operation to satisfy the steam balance.

• Demonstrate how to use optimization to minimize boiler feed water and venting steam.

The following figure illustrates the refinery steam balance as constructed in AVEVA Process Simulation.