ABSTRACT
Most scheduling methods are limited to the short-term scheduling case, and solution of problems over long time horizons may prove challenging or impossible with these methods. Inclusion of additional considerations such as heat integration further complicates the problem. A model for the simultaneous optimization of the schedule and energy usage in heat-integrated multipurpose batch plants operated over long time horizons is presented in this chapter. The method uses a cyclic scheduling solution procedure. The proposed model includes indirect heat integration via heat storage, rather than just direct heat integration. This has largely not been considered in long-term heat integration models in current literature. Both the heat storage size and initial heat storage temperature are also optimized. The solution obtained over 24 h using the proposed cyclic scheduling model with direct heat integration for a multipurpose example is compared to the result obtained from the direct solution and an error of less than 6% is achieved.
