Integration of Production Planning and Scheduling in the Chemical Industry
Author(s)
Maravelias, Christos T.
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Abstract
To remain competitive in today’s environment, chemical companies must adopt an integrated view across
all their operations and use advanced planning methods to achieve enterprise-wide optimality. At the
production level, it is necessary to simultaneously consider medium-term (planning) and short-term
(scheduling) decisions. Despite recent advances in computer hardware and optimization software, current
methods are insufficient to address real-world instances of this integrated problem.
Three approaches to this integrated problem are discussed. First, a novel formulation for the “generalized”
lot-sizing problem is presented. This formulation accounts for process characteristics that are common in
the chemical industry but are not addressed by existing approaches. Second, a number of theoretical
results for discrete-time formulations are developed, enabling us to formulate problems that can be solved
very effectively. Third, we present how detailed scheduling models can be used off-line to obtain an
approximation of feasible production levels and an underestimation of production cost. Finally, we
present how these methods can be used to address large-scale integrated planning-scheduling problems.
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Date
2009-04-15
Extent
57:58 minutes
Resource Type
Moving Image
Resource Subtype
Lecture