Reactive schedule modification in multipurpose batch chemical plants

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00025a011· OSTI ID:5308387

Kanakamedala, K B; Reklaitis, G V; Venkatasubramanian, V ^[1]

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1. Purdue Univ., West Lafayette, IN (United States). School of Chemical Engineering

A new scheme is described for reactive schedule modification in the face of unexpected deviations in processing times and unit availabilities of a multipurpose batch plant (MBP). Schedule modification is done using at least impact heuristic beam search which proceeds in two levels: creation of a decision tree which makes use of possible reroutings of the product that is causing a conflict, and heuristic pruning of the search space to contain the combinatorial complexity. The heuristic chooses a path among all possible reroutings for a product such that the impact of each decision on the rest of the schedule is kept as small as possible. This approach has been implemented and tested on a number of simulated deviations in a MBP case study with three products. The proposed least impact heuristic was found to perform better than the earliest finishing unit heuristic in all the cases considered.

• OSTI ID: 5308387
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Journal Name: Industrial and Engineering Chemistry Research; (United States) Vol. 33:1; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

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CALCULATION METHODS
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DECISION TREE ANALYSIS
FLUCTUATIONS
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