(733d) An Integrated Chemical Site Planning and Scheduling Framework---Model and Algorithm
In particular, the model framework simultaneously captures (1) different discrete and continuous operating modes of production units; (2) storage facilities including tanks, reservoirs, pipelines, rail cars, and barges and associated time delay and rate constraints; (3) handling of redundancy of utilities such as steam through smoothing and symmetry breaking methods; (4) production ramping constraints, recycles, and residence time delays; (5) maintenance and turnaround outages and downtimes; (6) reliability of production units including unplanned events and yield and selectivity degradation; (7) transport, supply and demand constraints; and (8) economics. The model is generalized to flexibly handle time-dependent and uncertainty-dependent data with multiple time scales. We discuss algorithmic aspects such as heuristics and relaxations, preprocessing techniques, and possible reformulations for different model components. We provide computational results on a large industrial-size test case.
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