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Processes 2017, 5(4), 66; https://doi.org/10.3390/pr5040066

Using Simulation for Scheduling and Rescheduling of Batch Processes

Batch Process Technologies, Inc., 112 Eden Court, West Lafayette, IN 47906, USA
Received: 3 September 2017 / Revised: 23 October 2017 / Accepted: 26 October 2017 / Published: 2 November 2017
(This article belongs to the Special Issue Combined Scheduling and Control)
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Abstract

The problem of scheduling multiproduct and multipurpose batch processes has been studied for more than 30 years using math programming and heuristics. In most formulations, the manufacturing recipes are represented by simplified models using state task network (STN) or resource task network (RTN), transfers of materials are assumed to be instantaneous, constraints due to shared utilities are often ignored, and scheduling horizons are kept small due to the limits on the problem size that can be handled by the solvers. These limitations often result in schedules that are not actionable. A simulation model, on the other hand, can represent a manufacturing recipe to the smallest level of detail. In addition, a simulator can provide a variety of built-in capabilities that model the assignment decisions, coordination logic and plant operation rules. The simulation based schedules are more realistic, verifiable, easy to adapt for changing plant conditions and can be generated in a short period of time. An easy-to-use simulator based framework can be developed to support scheduling decisions made by operations personnel. In this paper, first the complexities of batch recipes and operations are discussed, followed by examples of using the BATCHES simulator for off-line scheduling studies and for day-to-day scheduling. View Full-Text
Keywords: batch process; scheduling; simulation; coordination control; rescheduling batch process; scheduling; simulation; coordination control; rescheduling
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Joglekar, G. Using Simulation for Scheduling and Rescheduling of Batch Processes. Processes 2017, 5, 66.

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