Abstract
We consider the problem of optimizing the location and size of buffers in semi-continuous manufacturing processes. This problem is formulated as a non-linear integer program that determines the optimal buffer size for individual stages and allocates tanks to those stages in order to minimize total tank inclusion, holding, quality, process overshoot and undershoot costs. We develop heuristics to solve the problem and derive bounds to evaluate the quality of the heuristics. This method is implemented at three glucose and three sorbitol production processes at a leading food-processing company. This has resulted in total annual cost savings of around 6.4% or $9 million. In addition, this work has had significant strategic and organizational impact at this company.
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