(359b) Scheduling with Batching Decisions and Energy Constraints for Steelmaking Continuous-Casting Production
AIChE Annual Meeting
Tuesday, November 15, 2016 - 12:49pm to 1:08pm
The scheduling of steelmaking continuous-casting (SCC) production2, 14-16 is of vital importance in steel production because of its capital and energy intensive-nature, and the tight relationship between energy cost and production process. Effective scheduling of SCC production is thus critical to improve productive and reduce energy consumption. Batching1 in the scheduling of SCC production is to make a decision on how to group and sequence jobs (charges) to form job groups (casts) to meet the batch production mode in the continuous casting process. In this presentation, an improved unit-specific event-based continuous-time based MILP model, proposed by Ierapetritou and Floudas3,4, Ierapetritou et al.5, Lin and Floudas6, Shaik et al.7, Shaik and Floudas8,10, Janak and Floudas9, Janak et al.11, Li and Floudas12 and Lin et al13, is developed for the problem, and the batching decisions and the energy constraints are all incorporated into. The energy constraints represent the conversion process from the Linz-Donawitz process gas (LDG) to electricity. The problem considers the minimum makespan as the scheduling objective and the minimum of the total electricity costs as the energy objective. A multi-objective optimization framework which incorporates the Îµ-constraint method and the weighted sum method is proposed to solve the problem. The framework generates the nondominated set. Preliminary results based on an instance of 8 jobs and 5 machines of 3 stages are presented to show the effectiveness of the multi-objective optimization framework and demonstrate the tradeoffs between minimum makespan and energy cost.
Keywords:SCC production, scheduling, batching, energy, multi-objective optimization
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