Heat Integration in Batch Processes

Abstract: This chapter addresses Heat Integration in multipurpose batch plants in situations where the schedule is known a priori, as well as cases that are characterised by unknown prior production schedules. In most published literature, Heat Integration of batch facilities is treated as a secondary objective to production scheduling, which implies that the starting and ending times of tasks are fixed a priori. However, suppression of time as a variable in the overall optimisation framework has proven to result in suboptimal results. True optimum is achieved when time is treated as a variable. The chapter presents a promising graphical technique that could be used in setting targets for heat recovery and design of the corresponding utility system. As in all graphical techniques, time is treated as a parameter rather than as a variable. This is followed by a mathematical model that allows time to be treated as a variable in setting energy targets and storage design. The performance of this model is demonstrated through a case study.

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