HEAT INTEGRATION FOR BATCH PROCESSES - PART 2 - HEAT-EXCHANGER NETWORK DESIGN

A three-step design procedure is proposed for the design of heat excha nger networks (HENs) for batch/semi-continuous processes. This consist s of the initial individual design, the rematching design and the fina l overall design. Firstly, for every time interval, the conventional m ethods for continuous processes can be used directly to develop the in itial individual designs. Based on the information provided by this de sign, the second individual designs are then performed by focusing on the optimal rematching of streams for maximum use of the common exchan gers. Finally, the overall design is obtained through some adjustments of area, energy exchanged and configuration of the HEN for further op timization of the whole system. The information on rematching is obtai ned by solving an MILP model-the transshipment model developed specifi cally for batch/semi-continuous processes. A case study is provided to demonstrate the design procedure and its effectiveness.