Abstract
With the demand for improving production efficiency and the application of advanced process control, modern chemical production has increasingly attached importance to process operational safety. A systematical framework for process operational safety index (POSI) design and synthesis is proposed in this work. The notion of general operational safety is defined firstly, and safety critical variables are introduced for quantification. With the consideration of dynamics and robustness, the relationships between safety critical variables and POSI are discussed sufficiently. Based on these relationships and the frameworks of reachable set, flexibility index and control barrier function, the formula forms of POSI are further determined and summarized. Finally, the feed-forward neuron network is utilized as an approximator and classier to improve the continuity and usability of POSI.
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