The design and control of resilient heat exchanger network, target temperature variation case

Abstract

Heat exchanger network (HEN) is an effective method to recover the heat energy used in process plants. However, the energy integration causes to the interactions among process units and some cases there are variation in target temperature may cause the process more difficult to maintain the target temperature. Therefore, in order to achieve maximum energy recovery and to track target temperature at changing desirable values, the resilient heat exchangers that can tolerate the varied target temperatures are indeed necessary. This research, the resilient heat exchanger network design procedure provided by Wongsri (1990) is extended cover the design resilient network in case target temperature variation. We presents procedure for design control structure of heat exchanger network using heuristic approach such as Pinch Design, Match Patterns, Disturbance Directedness, Bypass Setting, Split Ratio and Selector Switch Setting to solve 3 heat exchanger network problems. It has been shown that our procedure is able to maintain target temperatures at specified values. Furthermore, our design does not violate maximum energy recovery. The heat exchanger network with control structures are programmed using HYSYS for control structure performance tests.