This study deals with the modelling and simulation of low density polyethylene (LDPE) production. LDPE is one of the most widely produced polymers which appears in the form of simple goods in our everyday life (e.g. food and pharmaceutical packaging, carrier bags). It is produced in a complex industrial process which takes place under extreme operating conditions (at pressure of ca. 2000-3000 bar) and may lead to nonlinear dynamics due to highly exothermic addition polymerization reactions. In principle, the process is represented by a distributed system with an external coordinate (the reactor length > 1000m) and various internal coordinates (the chain length of the polymer molecules, short and long chain branching and the number of double bounds), which can have strong effect on product properties. In this contribution a detailed reference model is introduced and possible model simplifications are discussed systematically from an on-line optimization and control point of view.
This study deals with the dynamic modelling and simulation of low-density polyethylene (LDPE) production plant. LDPE is produced in a complex process which takes place under extreme operating conditions and may lead to nonlinear dynamics due to highly exothermic reactions and material recycles around the reactor. In principle, the process is represented by a distributed parameter system with an external coordinate (the reactor length) and various internal coordinates (the chain length of the polymer molecules, short-and long-chain branching and the number of double bounds) resulting in a large scale model. In this contribution a detailed reference model is introduced and possible model simplifications are discussed systematically from on-line optimization and control point of view.
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