Process simulation—steady state equipment parameters

Within the database of the flowsheet editor, only prominent information about the flowsheet elements is stored, including characteristic parameters of process steps and equipment items as well as stream and piping information. This information needs to be shared for the development of further mathematical models inside modeling tools, the cost analysis of different process parts, as well as the specification of steady-state dynamic simulations in simulators. 

The steady-state models in simulators do not solve time-dependent equations. They simulate the steady-state operation of process units (operation subroutines) and estimate the sizes and costs of process units (cost subroutines). Two other types of subroutines are used to converge recycle computations (convergence subroutines) and to alter the equipment parameters (control subroutines). These subroutines are discussed in this section. 

Meet the environmental and quality requirements of the Specialty pulp market Early in the process design, the mill decided to utilize simulation to outline and evaluate several mill upgrade alternatives. This approach made it possible to test hypotheses and assess different alternatives at a small cost and has helped with de-bottlenecking of the process before the actual systems were built. Steady state simulation was utilized to provided the required mass and energy balance, while dynamic simulation has later been used to verify the design parameters like equipment sizing. 

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