Converting steady-state process models to dynamic

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School of Chemical Engineering | Master's thesis
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Kem-42

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en

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x + 65 + [3]

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Abstract

The objective of this work was to develop a tool for importing Aspen Plus steady state process models into the dynamic simulator ProsDS. In the literature part, the differences between steady-state and dynamic process simulation were studied by comparing the mathematical models used in each. The most significant difference is that accumulation of matter can occur in a vessel during dynamic simulation, but not in steady-state. Also, in dynamic simulation it is preferable to have controllers managing the state of the system, rather than setting parameters such as temperature and pressure directly. Different types of process simulation approaches, solution methods, and commercial steady-state to dynamic process model converters were also reviewed. In the applied part, the converting tool was programmed and tested. The tool builds dynamic process models in ProsDS based on configuration information retrieved from Aspen Plus' input files, and it also imports steady-state simulation results as initial values. The possibility to import initial states is what makes the converter truly helpful, since the start-up of dynamic process simulations can be demanding. Two example conversions were carried out, one concerning pressure drop calculations in pipelines, and one distillation column for safety valve sizing purposes. Since a process model's exact configuration must be determined from case to case, user input is still needed in most cases. Nevertheless, the converter was found to work correctly, and has the potential to be of great use in design work.

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Supervisor

Alopaeus, Ville

Thesis advisor

Liikala, Teemu
Sorvari, Olli

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