Abstract
Heat exchanger networks (HENs) are drivers of sustainability in chemical process plants. Due to their interaction with various process units, their operation is frequently subjected to disturbances in inputs and planned changes in targets. This motivates the need for optimal operation and control. This paper addresses optimal operation of a class of HENs involving stream splits. It is shown that these stream splits can be used to direct the energetic effect of a disturbance along a favourable path (e.g. minimum energy consumption) and thus allow for optimal operation. Specifically, a two-step strategy is proposed involving steady state optimisation for redirection of energetic effect of the disturbance based on the structure of the network. This is followed by implementation of a feedback control system to track the targets given by the optimiser. The effectiveness of the proposed framework is illustrated with the help of a benchmark example.
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