7 research outputs found
Sustainable chemical processing and energy-carbon dioxide management: review of challenges and opportunities
Sustainable chemical processing and energy-carbon dioxide management: Review of challenges and opportunities
Short-Term Scheduling of Batch Plants: Reformulation for Handling Material Transfer at the Same Event
This work presents a new variant
of a unit-specific event-based
model for short-term scheduling of batch plants. The motivation behind
the proposed model is to further reduce number of events necessary
to efficiently solve a given scheduling model. The main novelty in
the proposed formulation is that the production and consumption tasks
of each intermediate state are modeled to take place at the same event,
in contrast to existing batch scheduling models where the consumption
tasks normally start at the next event compared to the production
tasks. This is the first time such a feature has been attempted in
batch process scheduling, although it has been done in scheduling
of continuous plants. Also, this is the first attempt where we are
able to model the unit-specific events in their true sense, where
the first event in each unit actually takes up the first event. The
model is primarily applicable and useful for problems involving no
recycle streams, although a hybrid approach has been suggested for
problems with recycle streams and different reformulations are presented
for both cases. In almost all the cases considered, the proposed model
gives a reduction in the number events (on the order of two to three)
and fewer constraints and variables compared to recent models in the
literature. In 77% of the cases, especially for problems with no recycle
streams, the proposed feature also results in better computational
performance